Series salt-containing wastewater concentration and crystallization system and method based on humidification and dehumidification

Abstract

The series salt-containing waste liquid concentration and crystallization system and method based on humidification and dehumidification belong to the field of thermal desalination technology. The present invention can solve the problem of convenient separation of different salt crystallization substances in humidification and dehumidification waste liquid desalination. The technical points are that the humidification bin of the first concentration and crystallization device supplies water vapor with a first water content to its dehumidification bin, and the water vapor in the dehumidification bin supplies water vapor to its subsequent stage and step by step to the dehumidification bin of the subsequent concentration and crystallization device, and is cooled step by step in each dehumidification bin; the dehumidification bin of the third concentration and crystallization device is the last dehumidification bin, and the dehumidification bin supplies water vapor with the lowest water content to its humidification bin, and the water vapor with the lowest water content in the humidification bin supplies water vapor to its previous stage and step by step to the humidification bin of the previous concentration and crystallization device, and is heated in each humidification bin. The humidification bin of the first concentration and crystallization device is the humidification bin of the front stage, which has the effect of facilitating the decrystallization and collection of different types of salt.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal desalination, and in particular relates to a series-type salt-containing waste liquid concentration and crystallization system and method based on humidification and dehumidification. Background Art

[0002] Wastewater generated during industrial production has complex compositions, and direct discharge can cause serious environmental pollution. Therefore, appropriate treatment methods are necessary. Common methods for concentrating and desalting industrial wastewater include multi-stage flash evaporation, reverse osmosis, multiple-effect evaporation, and electrodialysis. Multi-stage flash evaporation uses reduced pressure to flash evaporate heated wastewater, condensing the vapor into fresh water. The concentrated wastewater then proceeds to the next flash evaporation stage. Multi-stage flash evaporation consumes a lot of energy, making it unsuitable for small-scale production processes. Multiple-effect evaporation units require a large footprint and high investment costs. As wastewater concentration increases, scaling increases, reducing evaporation efficiency and causing corrosion to the inner walls of the unit, requiring regular cleaning and maintenance. Both reverse osmosis and electrodialysis utilize the osmotic action of membranes to purify specific substances from wastewater under the application of external energy. However, membrane technology for purifying wastewater places high demands on the raw liquid. Scaling during the purification process can significantly reduce the membrane's lifespan and increase operating costs.

[0003] Humidification and dehumidification technology has proven practical for desalting wastewater. This method uses air as a carrier, circulating between humidification and dehumidification chambers. The saturated vapor pressure difference between the hot and cold air is exploited to remove water from the wastewater and condense it into fresh water. Humidification and dehumidification equipment for concentrating and crystallizing saline wastewater offers advantages such as a simple structure, low cost, and the ability to utilize low-grade heat sources.

[0004] However, single-unit humidification and dehumidification units typically operate at a single, fixed temperature within the humidification unit. For saline wastewater containing multiple salts, a crystallization unit is often required to collect the crystals. Furthermore, most of the crystals and dirt in the wastewater have colloidal properties, interacting with each other during movement and also adsorbing onto surfaces they come into contact with. As the desalination process progresses, the number and frequency of collisions between crystals and solid matter, such as dirt, increases, and the probability of solid matter agglomerating increases, leading to blockages in the system and pipelines. Summary of the Invention

[0005] For saline wastewater containing a variety of salt substances, especially salts with different solubilities at different temperatures and substances with different volatilities at different temperatures, the present invention can solve the problem of convenient separation of different salt crystal substances in the desalination of wastewater by humidification and dehumidification. In a first aspect, according to some embodiments of the present application, the series-type saline wastewater concentration and crystallization system based on humidification and dehumidification includes a concentration and crystallization device, wherein the concentration and crystallization device is configured as follows:

[0006] The first concentration crystallization device is arranged at the head end,

[0007] at least one second concentration and crystallization device disposed in the middle section, and

[0008] A third concentration and crystallization device is provided at the end;

[0009] The crystallization device includes a humidification chamber and a dehumidification chamber;

[0010] The humidifying chamber of the first concentrating and crystallizing device supplies water vapor with a first water content to the dehumidifying chamber of the first concentrating and crystallizing device, and the water vapor with the first water content in the dehumidifying chamber of the first concentrating and crystallizing device supplies water vapor to the dehumidifying chamber of the subsequent concentrating and crystallizing device step by step, and is cooled step by step in each dehumidifying chamber, so that the water content of the water vapor gradually decreases;

[0011] Among them, the dehumidification bin of the third concentrating crystallization device is the dehumidification bin of the last stage. The dehumidification bin of the third concentrating crystallization device supplies water vapor with the lowest water content to the humidification bin of the third concentrating crystallization device. The water vapor with the lowest water content in the humidification bin of the third concentrating crystallization device supplies water vapor to its previous stage and to the humidification bin of the previous stage concentrating crystallization device step by step, and is heated in each stage of the humidification bin. The water content of the water vapor gradually increases. The humidification bin of the first concentrating crystallization device is the humidification bin of the first stage.

[0012] According to the serial salt-containing waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the humidification chamber includes an upper shell, a sieve plate, a lower shell, a filler, and a vibrator. The upper shell forms a first cavity inside, the lower shell forms a second cavity inside, and the sieve plate separates the first cavity from the second cavity.

[0013] Wherein: the filler is filled in the first cavity below the spray component, and the vibrator is arranged in the first cavity filled with the filler.

[0014] According to the series-type salt-containing waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the humidification bin, the upper shell of the humidification bin is provided with a circulating waste liquid inlet and a first humidification bin water vapor outlet, and the lower shell is provided with a first humidification bin air supply inlet and a circulating waste liquid discharge outlet;

[0015] The dehumidification chamber includes a shell and a cooling member, a third cavity is formed inside the shell, wherein a first dehumidification chamber water vapor inlet is provided at the upper portion of the shell, and a first dehumidification chamber water vapor outlet and a water droplet discharge outlet are provided at the lower portion of the shell;

[0016] in:

[0017] The upper shell of the humidification bin of the second concentrating crystallization device is further provided with a second humidification bin water vapor outlet, and the upper part of the shell of the dehumidification bin of the second concentrating crystallization device is further provided with a second dehumidification bin water vapor inlet;

[0018] The upper shell of the humidification bin of the third concentrating crystallization device is further provided with a second humidification bin water vapor outlet, and the lower shell of the humidification bin is further provided with a second humidification bin air supply inlet;

[0019] The upper portion of the shell of the dehumidification bin of the third concentrating crystallization device is further provided with a second dehumidification bin water vapor inlet, and the lower portion of the shell of the dehumidification bin is further provided with a second dehumidification bin water vapor outlet;

[0020] in:

[0021] The circulating waste liquid inlet of the upper shell of the humidification bin of the subsequent-stage concentrating crystallization device is connected to the circulating waste liquid discharge outlet of the lower shell of the humidification bin of the previous-stage concentrating crystallization device, so that the saline waste liquid discharged from the circulating waste liquid discharge outlet of the humidification bin of the previous-stage concentrating crystallization device passes into the circulating waste liquid inlet of the humidification bin of the subsequent-stage concentrating crystallization device to enter the first cavity of the upper shell of the humidification bin of the subsequent-stage concentrating crystallization device;

[0022] The connecting channel of the first concentrating and crystallizing device is connected to the first humidifying chamber water vapor outlet of the upper shell of the humidifying chamber and the first dehumidifying chamber water vapor inlet on the upper part of the shell of the dehumidifying chamber, so that the water vapor is discharged from the first humidifying chamber water vapor outlet of the upper shell of the humidifying chamber into the first dehumidifying chamber water vapor inlet on the upper part of the shell of the dehumidifying chamber, and then enters the third cavity of the shell of the dehumidifying chamber;

[0023] The cooling water outlet of the cooling member in the third cavity of the dehumidification bin of the subsequent-stage concentrating crystallization device is connected to the cooling water inlet of the cooling member in the third cavity of the dehumidification bin of the preceding-stage concentrating crystallization device, so that water from the cooling water outlet of the cooling water member in the third cavity of the dehumidification bin of the subsequent-stage concentrating crystallization device passes into the cooling water inlet of the cooling member in the third cavity of the dehumidification bin of the preceding-stage concentrating crystallization device to enter the cooling member in the third cavity of the dehumidification bin of the preceding-stage concentrating crystallization device, thereby condensing water vapor in the third cavity.

[0024] The second dehumidification chamber water vapor inlet on the upper portion of the shell of the dehumidification chamber of the subsequent-stage concentrating crystallization device is connected to the first dehumidification chamber water vapor outlet on the lower portion of the shell of the dehumidification chamber of the previous-stage concentrating crystallization device, so that the water vapor discharged from the first dehumidification chamber water vapor outlet on the lower portion of the shell of the dehumidification chamber of the previous-stage concentrating crystallization device passes into the second dehumidification chamber water vapor inlet on the upper portion of the shell of the dehumidification chamber of the subsequent-stage concentrating crystallization device, and enters the third cavity of the shell of the dehumidification chamber of the subsequent-stage concentrating crystallization device, so that the water content of the water vapor is gradually reduced;

[0025] The second dehumidification bin water vapor outlet at the lower part of the shell of the dehumidification bin of the third concentrating crystallization device and the second humidification bin air supply inlet of the lower shell of the humidification bin are connected by an air supply pipe, and a blowing component is provided in the air supply pipe, and the air outlet of the blowing component in the air supply pipe is directed toward the second humidification bin air supply inlet of the lower shell of the humidification bin, so that the water vapor discharged from the second dehumidification bin water vapor outlet at the lower part of the shell of the dehumidification bin of the third concentrating crystallization device passes into the second humidification bin air supply inlet of the lower shell of the humidification bin, so as to enter the second cavity of the lower shell of the humidification bin, and further passes into the first cavity of the upper shell of the humidification bin;

[0026] The second humidification bin water vapor outlet of the upper shell of the humidification bin of the subsequent stage concentrating crystallization device is connected to the first humidification bin air supply inlet of the lower shell of the humidification bin of the previous stage concentrating crystallization device, so that the water vapor discharged from the second humidification bin water vapor outlet of the upper shell of the humidification bin of the subsequent stage concentrating crystallization device passes into the air supply inlet of the first humidification bin lower shell of the humidification bin of the previous stage concentrating crystallization device, so as to enter the second cavity of the lower shell of the humidification bin of the previous stage concentrating crystallization device, and further passes into the first cavity of the upper shell of the humidification bin of the previous stage concentrating crystallization device, so that the water content of the water vapor gradually increases.

[0027] According to the series saline wastewater concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, wherein:

[0028] The upper shell of the second concentrating crystallization device is further provided with a first humidification chamber water vapor outlet, and the upper part of the shell of the dehumidification chamber is further provided with a first dehumidification chamber water vapor inlet;

[0029] The lower shell of the humidification bin of the second concentrating crystallization device is further provided with a second humidification bin air supply inlet, and the lower part of the shell of the dehumidification bin is further provided with a second dehumidification bin water vapor outlet;

[0030] The connecting channel of the second concentrating and crystallizing device is connected to the first humidifying chamber water vapor outlet of the upper shell of the humidifying chamber and the first dehumidifying chamber water vapor inlet on the upper part of the shell of the dehumidifying chamber, so that the water vapor is discharged from the first humidifying chamber water vapor outlet of the upper shell of the humidifying chamber into the first dehumidifying chamber water vapor inlet on the upper part of the shell of the dehumidifying chamber, and then enters the third cavity of the shell of the dehumidifying chamber;

[0031] The second dehumidification bin water vapor outlet at the lower part of the shell of the dehumidification bin of the second concentrating crystallization device and the second humidification bin air supply inlet of the lower shell of the humidification bin are connected by an air supply pipe, and a blowing component is provided in the air supply pipe. The air outlet of the blowing component in the air supply pipe faces the second humidification bin air supply inlet of the lower shell of the humidification bin, so that the water vapor discharged from the second dehumidification bin water vapor outlet at the lower part of the shell of the dehumidification bin of the second concentrating crystallization device passes into the second humidification bin air supply inlet of the lower shell of the humidification bin, so as to enter the second cavity of the lower shell of the humidification bin, and further pass into the first cavity of the upper shell of the humidification bin.

[0032] According to the series-type salt-containing waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the upper shell of the third concentration and crystallization device is further provided with a first humidification bin water vapor outlet, and the upper part of the shell of the dehumidification bin is further provided with a first dehumidification bin water vapor inlet;

[0033] The connecting channel of the third concentration and crystallization device connects the first humidification tank water vapor outlet of the upper shell of the humidification tank and the first dehumidification tank water vapor inlet on the upper part of the shell of the dehumidification tank, so that water vapor is discharged from the first humidification tank water vapor outlet of the upper shell of the humidification tank into the first dehumidification tank water vapor inlet on the upper part of the shell of the dehumidification tank to enter the third cavity of the shell of the dehumidification tank.

[0034] According to some embodiments of the present application, the series saline waste liquid concentration and crystallization system based on humidification and dehumidification further includes a first heat exchanger, a circulation tank, a circulating waste liquid pump, and a second heat exchanger;

[0035] The cooling water inlet of the cooling member in the third cavity of the shell of the dehumidification bin of the third concentrating and crystallizing device is connected to external cooling water, the cooling water outlet of the cooling member in the third cavity of the shell of the dehumidification bin of the first concentrating and crystallizing device is connected to the primary side of the first heat exchanger, and the output of the primary side of the first heat exchanger is connected to the external cooling water;

[0036] The circulating waste liquid discharge outlet of the lower shell of the dehumidification bin of the third concentrating crystallization device is connected to the secondary side of the first heat exchanger, so that the circulating waste liquid discharged from the circulating waste liquid discharge outlet of the lower shell of the dehumidification bin of the third concentrating crystallization device passes into the secondary side of the first heat exchanger, and the output of the secondary side of the first heat exchanger is connected to the circulation pool, and the exogenous salt-containing waste liquid is connected to the circulation pool through a pipeline;

[0037] The salt-containing waste liquid in the circulation pool and the external salt-containing waste liquid are extracted by the circulating waste liquid pump through a pipeline and output to the first side of the second heat exchanger. The first side of the second heat exchanger is connected to the circulating waste liquid inlet of the upper shell of the humidification bin of the first concentration and crystallization device. The second side of the second heat exchanger is the heat source medium flow side.

[0038] According to the serial saline waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the humidification chamber includes a spraying component, which sprays the saline waste liquid input into the first cavity through the circulating waste liquid inlet of the upper shell, forms water vapor and saline droplets by spraying, and sprays the saline waste liquid toward the first cavity;

[0039] wherein the cooling member cools the water vapor introduced into the third cavity through the water vapor inlet at the upper portion of the shell to form water droplets;

[0040] The humidification chamber also includes

[0041] The auxiliary heater includes multiple groups of resistance wires arranged in parallel in the radial direction of the humidification chamber. The resistance wires are bent along the dripping direction of the saline droplets and arranged inside the humidification chamber. Gaps are set between each group of resistance wires to allow the saline droplets to pass through.

[0042] According to the serial salt-containing waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the humidification bin further includes a vibration fixing base, the vibrator is arranged on the vibration fixing base, and the vibration fixing base is arranged on the inner wall of the upper shell;

[0043] Wherein, at least two of the vibrators are distributed in the first cavity filled with filler at intervals along the travel direction of the saline waste liquid in the first cavity, the vibrators are arranged on the vibration fixing seat, and different vibration fixing seats are distributed in the first cavity of the upper shell at intervals along the travel direction of the saline waste liquid in the first cavity, so that the different vibrators are distributed in the first cavity of the upper shell at intervals along the travel direction of the saline waste liquid in the first cavity;

[0044] Wherein, at least one through hole is provided on the vibration fixing seat.

[0045] According to the serial salt-containing waste liquid concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application, the vibration fixing seat includes a first vibration fixing seat and a second vibration fixing seat, the fixed end of the first vibration fixing seat is arranged on the shell inner wall on the first side of the first cavity of the upper shell, and the fixed end of the second vibration fixing seat is arranged on the shell inner wall on the second side of the first cavity of the upper shell, and the first side is arranged opposite to the second side, so that the vibrator arranged on the first vibration fixing seat is distributed on the first side of the first cavity of the upper shell, and the vibrator arranged on the second vibration fixing seat is distributed on the second side of the first cavity of the upper shell;

[0046] Two adjacent vibration mounts spaced apart and spaced apart at a certain distance above and below along the travel direction of the saline waste liquid in the first cavity, wherein one of the vibration mounts is a first vibration mount and the other is a second vibration mount, so that the vibrators provided on the two adjacent vibration mounts are arranged on a first side of the first cavity of the upper shell and on a second side of the first cavity of the upper shell;

[0047] The front end portion of the vibration mount is disposed beyond a center position between opposite first and second sides of the first cavity of the upper housing, the front end portion of the vibration mount being an end opposite to the fixed end portion of the vibration mount.

[0048] In a second aspect, a crystallization method of a series saline wastewater concentration and crystallization system based on humidification and dehumidification in some embodiments of the present application comprises the following steps:

[0049] The saline waste liquid is introduced into the upper shell through the circulating waste liquid inlet of the upper shell of the humidification bin of the first concentrating and crystallizing device, and is sprayed by the spraying member to form water vapor and saline droplets. The saline droplets drip along the axial direction of the shell and fall into the second cavity of the lower shell, and the second cavity of the lower shell gathers the saline droplets.

[0050] The water vapor of the first concentrating crystallization device is discharged from the first humidifying chamber water vapor outlet of the upper shell of the humidifying chamber and passed into the first dehumidifying chamber water vapor inlet on the upper part of the shell of the dehumidifying chamber, and then enters the third cavity of the shell of the dehumidifying chamber;

[0051] The saline waste liquid discharged from the circulating waste liquid discharge outlet of the humidification bin of the previous stage concentrating crystallization device is passed into the circulating waste liquid inlet of the humidification bin of the next stage concentrating crystallization device to enter the first cavity of the upper shell of the humidification bin of the next stage concentrating crystallization device;

[0052] The water from the cooling water outlet of the cooling water component in the third cavity of the dehumidification bin of the subsequent stage concentrating crystallization device is passed into the cooling water inlet of the cooling component in the third cavity of the dehumidification bin of the previous stage concentrating crystallization device, and then enters the cooling component in the third cavity of the dehumidification bin of the previous stage concentrating crystallization device, so as to condense the water vapor in the third cavity;

[0053] The water vapor discharged from the first dehumidification chamber water vapor outlet at the lower part of the shell of the dehumidification chamber of the previous stage concentration and crystallization device is passed into the second dehumidification chamber water vapor inlet at the upper part of the shell of the dehumidification chamber of the next stage concentration and crystallization device, and then enters the third cavity of the shell of the dehumidification chamber of the next stage concentration and crystallization device;

[0054] The water vapor discharged from the second dehumidification chamber water vapor outlet at the lower part of the shell of the dehumidification chamber of the third concentrating crystallization device is passed into the second humidification chamber air supply inlet of the lower shell of the humidification chamber to enter the second cavity of the lower shell of the humidification chamber, and further passes into the first cavity of the upper shell of the humidification chamber;

[0055] The water vapor discharged from the water vapor outlet of the second humidification bin of the upper shell of the humidification bin of the subsequent stage concentrating and crystallizing device is passed into the air supply inlet of the lower shell of the first humidification bin of the humidification bin of the previous stage concentrating and crystallizing device, so as to enter the second cavity of the lower shell of the humidification bin of the previous stage concentrating and crystallizing device, and further pass into the first cavity of the upper shell of the humidification bin of the previous stage concentrating and crystallizing device;

[0056] After the system has been running for a period of time, the vibrator in the first cavity of the upper shell of the humidification chamber is started, and the vibration fixing seat connected to the vibrator vibrates the filler, causing the crystals on the filler surface and the shell wall to fall off. The crystals attached to the filler surface fall off from the attached surface and fall through the holes of the vibration fixing seat and fall into the second cavity of the lower shell of the humidification chamber. The crystals that are vibrationally detached gather in the concentrated liquid tank at the bottom of the second cavity of the lower shell of the humidification chamber. The concentrated liquid tank contains concentrated liquid containing salt droplets. The concentrated liquid is in a supersaturated state. The precipitated crystalline material is deposited in the concentrated liquid tank for removal.

[0057] Beneficial effect: The present invention has a series scheme for configuring the concentration crystallization device. In the humidification bins of the concentration crystallization devices at different levels, the water vapor with the lowest water content is supplied step by step to the humidification bin of the concentration crystallization device at the previous level. The circulating waste liquid inlet of the upper shell of the humidification bin of the latter level concentration crystallization device is connected to the circulating waste liquid discharge outlet of the lower shell of the humidification bin of the previous level concentration crystallization device, so that the circulating waste liquid has a certain temperature gradient (temperature difference). In addition, the temperature gradient can be further controlled by an auxiliary heater. Salts with different solubilities at different temperatures and substances with different volatilities at different temperatures can be precipitated and attached to the filler in the humidification bin of the concentration crystallization device within the temperature range of the corresponding temperature difference, so that different types of salts that are sensitive to temperature precipitation can be separated and attached to the filler in the humidification bin of the concentration crystallization device within the temperature range of the corresponding temperature difference, and different salt crystals can be conveniently separated in the waste liquid cycle. In this way, the present invention can separate and recover different salt crystals without using a crystallizer, thereby greatly saving the energy consumed by the use of a crystallizer.

[0058] In a further scheme, the present invention uses a vibration decrystallization method to make it easier to decrystallize different types of salts attached to the fillers of the humidification bins of different levels of concentration and crystallization devices. On the one hand, it can reduce blockage, and on the other hand, it can be more convenient to separate and recover different salt crystals. That is, after the system has been running for a period of time, the vibrator in the first cavity of the upper shell of the humidification bin is started, and the vibration fixing seat connected to the vibrator vibrates the filler to cause crystals on the filler surface and the shell wall to fall off. The crystals attached to the filler surface fall off from the attached surface and fall from the holes of the vibration fixing seat and fall into the second cavity of the lower shell of the humidification bin. The crystals that are vibrated and fall off gather in the concentrated liquid tank at the bottom of the second cavity of the lower shell of the humidification bin. The concentrated liquid tank contains concentrated liquid containing salt droplets. The concentrated liquid is in an oversaturated state. The precipitated crystalline material is deposited in the concentrated liquid tank for removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the humidification chamber and the dehumidification chamber.

[0060] Figure 2 This is a schematic diagram of a series multi-stage humidification and dehumidification salt-containing waste liquid concentration system.

[0061] Figure 3 This is a schematic diagram of the parallel multi-stage humidification and dehumidification salt-containing waste liquid concentration system.

[0062] Figure 4 This is a schematic diagram of the spray dehumidification chamber.

[0063] Figure 5 It is a process diagram of the monomer concentration crystallization device in the parallel concentration system.

[0064] Figure 6 This is a schematic diagram of vibration decrystallization.

[0065] Figure 1-5 Middle: 1. Humidification chamber, 2. Circulating waste liquid inlet, 3. Sprinkler, 4. Sprinkler port, 5. Sprinkler bracket, 6. Sprinkler sieve plate, 7. Auxiliary heater, 8. Baffle, 9. Upper shell A, 10. Block, 11. Packing, 12. Sieve plate, 13. Overflow port, 14. Lower shell A, 15. Circulating waste liquid discharge outlet, 16. Fan, 17. Air preheater, 18. Water droplet discharge outlet, 19. Lower shell B, 20. Upper shell B, 21. Cooling water inlet, 22. Cooling pipe, 23. Cooling water outlet, 24. Dehumidification chamber, 25. Heat source, 26. Heating heat exchanger, 27. Circulating waste liquid pump, 28. Waste liquid concentrate, 29. Circulating pool, 30. Waste heat recovery heat exchanger, 31. Cooling water pump, 32. Circulating cooling water, 33. Five-stage humidification and dehumidification salty waste liquid concentration and crystallization device, 34. Four-stage humidification and dehumidification salty waste liquid concentration and crystallization device, 35. Three-stage humidification and dehumidification salty waste liquid concentration and crystallization device, 36. Two-stage humidification and dehumidification salty waste liquid concentration and crystallization device, 37. One-stage humidification Wet dehumidification and salt-containing waste liquid concentration and crystallization device, 38. Centrifugal crystallizer, 39. Sprinkler B, 40. Block B, 41. Baffle B, 42. Packing B, 43. Heater circulating waste liquid outlet temperature, 44. Heater waste liquid inlet temperature, 45. Heater waste liquid outlet temperature, 46. Heater circulating waste liquid inlet temperature, 47. Circulating waste liquid flow rate, 48. Waste liquid raw liquid temperature, 49. Circulating pool temperature, 50. Circulating waste liquid inlet temperature, 51. Wind speed, 52. Cold air temperature, 53. Cooling Water inlet temperature, 54. Cooling water flow rate, 55. Cooling water outlet temperature, 56. Hot air temperature, 57. Water vapor outlet of the first humidification chamber, 58. Water vapor inlet of the first dehumidification chamber, 59. Water vapor outlet of the first dehumidification chamber, 60. Connecting channel, 61. Air supply duct, 62. Air supply inlet of the first humidification chamber, 63. Water vapor outlet of the second humidification chamber, 64. Air supply inlet of the second humidification chamber, 65. Water vapor inlet of the second dehumidification chamber, 66. Water vapor outlet of the second dehumidification chamber, 67. Air supply duct.

[0066] Figure 6Middle: 1-1. Hot liquid inlet, 1-2. Shell, 1-3. Overflow tank, 1-4. Filler, 1-5. Perforated plate, 1-6. Hot liquid outlet, 1-7. Concentrate tank, 1-8. Vibration fixing seat, 1-9. Vibrator, 1-10. Air duct opening. DETAILED DESCRIPTION

[0067] The following is a detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that this embodiment is merely a detailed implementation plan and specific operating process based on the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

[0068] The present invention provides a multi-stage humidification and dehumidification device and system for concentrating and crystallizing saline wastewater. The system is composed of a cascade of multiple devices. Multiple groups of humidification and dehumidification devices for concentrating and crystallizing saline wastewater are cascaded to form a multi-stage humidification and dehumidification structure, and the number of stages can be increased or decreased according to operating conditions. Connecting the devices in different ways can focus on achieving different functions. For example, a series connection can achieve waste heat recovery, while a parallel connection can reduce scaling within the device. Furthermore, the present invention has a wide range of energy sources and can utilize low-grade heat sources including industrial waste heat and solar energy.

[0069] Example 1: Figure 1 and Figure 2 In this embodiment, in order to realize waste heat recovery during the operation of the device and improve energy utilization, a multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device is connected in series to form a cascade concentration system, such as Figure 2 As shown, the system includes: a heat source 25, a heating heat exchanger 26, a circulating waste liquid pump 27, a waste liquid raw liquid 28, a circulating pool 29, a waste heat recovery heat exchanger 30, a cooling water pump 31, circulating cooling water 32, a first-stage humidification and dehumidification saline waste liquid concentration and crystallization device 33, a second-stage humidification and dehumidification saline waste liquid concentration and crystallization device 34, a third-stage humidification and dehumidification saline waste liquid concentration and crystallization device 35, a fourth-stage humidification and dehumidification saline waste liquid concentration and crystallization device 36, and a fifth-stage humidification and dehumidification saline waste liquid concentration and crystallization device 37.

[0070] The humidification and dehumidification salt-containing waste liquid concentration and crystallization device at each level includes: a humidification chamber 1 and a dehumidification chamber 24.

[0071] The waste liquid raw liquid is transported to the circulation pool 29 through the pipeline for sufficient mixing. The circulating waste liquid in the circulation pool 29 is transported to the heating heat exchanger 26 through the circulating waste liquid pump 27 to exchange heat with the heat source. The heated circulating waste liquid is transported to the humidification bin 1 of the first-level humidification and dehumidification salt-containing waste liquid concentration and crystallization device 33.

[0072] The cooling water is delivered to the dehumidification chamber 24 of the five-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device 37 by the cooling water pump 31 .

[0073] The circulating waste liquid discharged from the circulating waste liquid discharge outlet 15 of the humidification bin 1 of the five-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device 37 and the cooling water discharged from the dehumidification bin 24 of the first-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device 33 are transported to the waste heat recovery heat exchanger 30 through a pipeline. After sufficient heat exchange, the circulating waste water is input into the circulation pool 29 through a pipeline, and the cooling water is transported to the circulating cooling water.

[0074] Furthermore, an agitator can be added to the circulation tank 29 to speed up the mixing of new and old waste liquids and prevent scaling.

[0075] The humidification chamber includes: a circulating waste liquid inlet 2, a sprinkler 3, a spray port 4, a sprinkler bracket 5, a sieve plate A6, an auxiliary heater 7, a baffle 8, an upper shell A9, a block 10, a filler 11, a sieve plate B12, an overflow port 13, a lower shell A14, a circulating waste liquid discharge outlet 15, a fan 16, an air preheater 17, a cold air inlet, and a hot air outlet.

[0076] The circulating waste liquid inlet 2 is connected to the sprayer 3 through the through hole of the upper shell A9. The sprayer 3 is located at the upper part of the shell A9, and the interior of the sprayer 3 is a hollow structure. The spray port 4 is connected to the bottom plate of the sprayer 3. The auxiliary heater 7 extends into the center of the humidification chamber 1 through the through hole in the upper part of the upper shell A9 to heat the circulating waste liquid for spraying. The auxiliary heater 7 also includes a shell, which is embedded in the shell connected to the humidification chamber 1, so that part of the shell is set outside the humidification chamber 1 and part of the shell is set inside the humidification chamber 1. The power supply line of the resistance wire passes through the shell into the interior of the humidification chamber 1 and is connected to the resistance wire, and the end of the resistance wire is fixed to the shell inside the humidification chamber 1, so that the heating element (resistance wire) is fixed inside the humidification chamber.

[0077] The sprayer bracket 5 is connected to the upper shell A9 to support the sprayer 3. The sieve plate A6 is connected to the upper shell A9 to evenly disperse the spray solution. There are four baffles 8, each of which is semicircular and connected to a corresponding baffle 10. The adjacent baffles 8 face opposite directions to increase the air movement distance inside the humidification chamber 1. The baffle 10 is connected to the upper shell A9 to support the baffle 8 and fix the position of the corresponding baffle. The sieve plate A6 is placed at the bottom of the upper shell A9, and the filler 11 is placed on the top of the sieve plate A6 and fills the upper shell A9. The baffle 8 and sieve plate 10 jointly support the filler 11. The lower shell A14 is connected to the upper shell A9, and the circulating waste liquid discharge outlet is connected to the lower shell A14. The first humidification chamber's water vapor outlet 57 (hot air outlet) is connected to the upper portion of the upper housing A9, and the first humidification chamber's air supply inlet 62 (cold air inlet) is connected to the lower portion of the housing A. A fan is placed in the duct of the first humidification chamber's air supply inlet 62 (cold air inlet) to drive air circulation. The fan is placed in the air supply duct 61. In some embodiments, an air preheater can also be placed in the air supply duct 61 to preheat the extracted air, raising the inlet temperature and increasing humidification efficiency.

[0078] Furthermore, the auxiliary heater 7 may be installed in the humidification chamber 1 or in a hot air duct.

[0079] Furthermore, the baffle 8 may have a semicircular or spiral structure.

[0080] Furthermore, the spray port 4 needs to be higher than the bottom plate of the sprayer 3. After the waste liquid accumulates to a certain height inside the sprayer 3, it is sprayed downward to ensure the uniformity of the spray. The spray port 4 includes a rotary spray type or an overflow trough type.

[0081] Furthermore, the auxiliary heater 7 is arranged according to the air flow path, and effectively supplements the heating of the sprayed waste liquid during the humidification process.

[0082] Furthermore, the bottom plates of the lower shell A14 and the lower shell B19 are inclined downward toward the center, so that the collected waste liquid and fresh water automatically flow into the circulating waste liquid discharge outlet and the water drop discharge outlet 18 respectively.

[0083] Furthermore, if the waste liquid accumulates too much, it can be discharged through the overflow port 13 or extracted by a water pump to prevent the waste liquid from entering the air duct.

[0084] The dehumidification chamber includes: a water droplet discharge outlet 18 (fresh water outlet), a lower shell B19, an upper shell B20, a cooling water inlet 21, a cooling pipe 22, a cooling water outlet 23, a hot air inlet, and a cold air outlet. The cooling pipe 22 is placed inside the upper shell B20, and the cooling water inlet is connected to the cooling pipe 22 through the through hole at the bottom of the upper shell B20, and the cooling water outlet 23 is connected to the cooling pipe 22 through the through hole at the top of the lower shell B20, and the cooling water flows from bottom to top. The water droplet discharge outlet 18 is connected to the lower shell B19. The first dehumidification chamber water vapor inlet 58 (hot air inlet) is connected to the upper part of the upper shell B20, and the first dehumidification chamber water vapor outlet 59 (cold air outlet) is connected to the lower part of the upper shell B20. The air passes through the dehumidification chamber 24 from top to bottom, the temperature is reduced, and the water vapor carried is condensed into fresh water.

[0085] Furthermore, the cooling pipes 22 are evenly arranged in the dehumidification chamber. The cooling pipes 22 can be coil-type or plate-type, etc., to increase the cooling area. Alternatively, a sprayer 3 can be used instead of the cooling pipes. During the cooling process of spraying cooling water, the condensed water mixes with the cooling water and is eventually discharged together.

[0086] Furthermore, the spraying devices in the humidification chamber 1 and the dehumidification chamber 24 include top spraying type, side wall spraying type, self-circulating multiple spraying type, etc.

[0087] Furthermore, the materials of the upper shell A9, the lower shell A14, the upper shell B20, the lower shell B19, the stopper 10, and the baffle 8 include corrosion-resistant materials such as PP, polyethylene, or glass fiber.

[0088] Furthermore, the shape of the filler includes arc, stepped ring or spherical, etc.

[0089] The first humidification chamber air supply inlet 62 (cold air inlet) and the second humidification chamber water vapor outlet 63 (hot air outlet) of the humidification chamber of the first to fifth stage humidification, dehumidification and salty waste liquid concentration and crystallization device are connected in sequence. The first dehumidification chamber water vapor outlet 59 (cold air outlet) and the second dehumidification chamber water vapor outlet 65 (hot air inlet) of the dehumidification chamber of the first to fifth stage humidification, dehumidification and salty waste liquid concentration and crystallization device are connected in sequence. In the first stage humidification, dehumidification and salty waste liquid concentration and crystallization device, the first humidification chamber water vapor outlet 57 (hot air outlet) of the humidification chamber 1 is connected to the first dehumidification chamber water vapor inlet 58 (hot air inlet) of the dehumidification chamber 24. In the five-stage humidification, dehumidification and salty waste liquid concentration and crystallization device, the first humidification chamber air supply inlet 62 (cold air inlet) of the humidification chamber 24 is connected to the second dehumidification chamber water vapor outlet 66 (cold air outlet) of the dehumidification chamber 24. The intermediate-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization unit has a humidification chamber and dehumidification chamber connected by pipes. A fan and air preheater are installed to assist circulation and improve efficiency. The circulating waste liquid discharged from the final stage exchanges heat with the cooling water discharged from the first stage in the waste heat recovery heat exchanger 30.

[0090] Furthermore, in the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device, the temperatures between each stage are different from each other and have a certain temperature gradient.

[0091] Furthermore, the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device can utilize the temperature differences between each stage to separate substances in the waste liquid in each stage of the device, including salts with different solubilities at different temperatures and substances with different volatilities at different temperatures.

[0092] Furthermore, the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device includes crystallization and desalination inside a certain stage or several stages of the device.

[0093] Furthermore, the wind speed in the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device includes increasing and decreasing according to the temperature changes in different stages of the device.

[0094] Furthermore, the connection modes between the humidification and dehumidification salt-containing waste liquid concentration and crystallization devices at each level include parallel connection, series connection, and the use of parallel and series connection together.

[0095] Furthermore, the concentrated waste liquid discharged from the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device is recycled again through the current stage and other stage humidification bins to enhance the heat and mass transfer between the waste liquid and the air.

[0096] Furthermore, when the air temperature flows inside the multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device, the temperature changes include gradually increasing, remaining unchanged, gradually decreasing, etc.

[0097] Furthermore, the humidification chamber 1 and the dehumidification chamber 24 inside the intermediate-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device are interconnected through a pipeline, and are provided with a fan and an air preheater for assisting circulation and improving circulation efficiency.

[0098] Furthermore, the waste liquid generated in the previous stage flows into the humidification chamber 1 of the next stage for concentration, and the cooling water of the next stage flows into the dehumidification chamber 24 of the previous stage.

[0099] Furthermore, the circulating waste liquid after waste heat recovery can be passed into the centrifugal crystallizer 38 , and after crystallization and desalination, the supernatant liquid is transported back to the circulation pool 29 .

[0100] Furthermore, the waste heat recovery method includes using the circulating wastewater and cooling water discharged from each stage for heat exchange within each stage, using the circulating wastewater and cooling water after multi-stage treatment for unified heat exchange, etc.

[0101] Furthermore, the auxiliary heater 7 can select heat sources of different temperatures according to the different temperatures of each stage, including industrial waste heat such as waste steam and flue gas, low-grade heat sources such as solar energy and geothermal energy.

[0102] Furthermore, the flow directions of the air and cooling water include bottom-up flow, top-down flow, etc.

[0103] Furthermore, the relative movement between the air and the cooling water, and between the air and the spray waste liquid includes forward flow, reverse flow, etc.

[0104] Furthermore, the air may be replaced by a gas in which water vapor has a greater diffusion coefficient, including helium, nitrogen, and the like.

[0105] The monitoring system includes: heating heat exchanger inlet and outlet temperatures, circulating waste liquid flow, waste liquid temperature, circulating pool temperature, circulating waste liquid inlet temperature, wind speed, cold air temperature, hot air temperature, cooling water flow, cooling water inlet temperature, and cooling water outlet temperature.

[0106] Furthermore, the parameters detected by the monitoring system include temperature, humidity, flow rate, TDS, concentration and other parameters related to liquid and air.

[0107] The multi-stage humidification and dehumidification saline waste liquid concentration system is used to concentrate the waste liquid, including the following steps:

[0108] The waste liquid is transported to the circulation pool 29 through a pipeline, and then transported to the heating heat exchanger 26 through the circulating waste liquid pump 27 to exchange heat with the heat source 25. The heated circulating waste liquid is transported to the humidification bin 1 of the first-stage humidification and dehumidification saline waste liquid concentration and crystallization device 37 through a pipeline. The circulating waste liquid is sprayed into the humidification bin 1 through the sprayer 3, and collides with the filler 11 during the falling process to form tiny droplets that are evenly distributed throughout the humidification bin 1. Excess circulating waste liquid is concentrated at the bottom of the humidification bin 1 and discharged, and continues to be sprayed in the next-stage humidification and dehumidification saline waste liquid concentration and crystallization device. The cooling water enters the dehumidification bin 24 of the fifth-stage humidification and dehumidification saline waste liquid concentration and crystallization device 33 through the cooling water pump 31, flows from bottom to top in the cooling pipe 22, and the outflowing cooling water participates in the next-stage cooling. The fan drives cold air into the humidification chamber 24 from below. During its ascent, the cold air is gradually heated and humidified. The cold air then passes through the humidification chamber 1 of the five-stage to the first-stage humidification, dehumidification, and concentration crystallization devices for heating and humidification. The hot and humid air enters the dehumidification chamber 1 from above and passes through the dehumidification chambers of the first-stage to the fifth-stage humidification, dehumidification, and concentration crystallization devices for salty waste liquid. During its descent, the hot air gradually cools down, and the water vapor it carries condenses into fresh water. The cooled and dehumidified air then enters the next cycle. That is, the humidification bin 1 of the intermediate-stage humidification, dehumidification and concentration crystallization device for salt-containing waste liquid transports water vapor to the dehumidification bin 24 through the connecting pipe 60, and the dehumidification bin 24 transports cold air to the humidification bin 1 through the air supply pipe between the second dehumidification bin water vapor outlet 66 and the second humidification bin air supply inlet 64, that is, the humidification, dehumidification and concentration crystallization device of the same level of the intermediate stage, its humidification bin 1 and the dehumidification bin 24 are still carrying out the above-mentioned small self-circulation, and the small self-circulation is in the above-mentioned large series circulation composed of the first to fifth-stage humidification, dehumidification and concentration crystallization device of the present invention. The intermediate-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device has an auxiliary circulation function. During the normal operation of the device, part of the cooled and dehumidified air is extracted, preheated, and then passed into the humidification chamber 1 for heating and humidification. Part of the heated and humidified air is passed into the dehumidification chamber 24 for cooling and condensation, thereby avoiding the main device from being unable to completely humidify and dehumidify the air. As an auxiliary circulation, the circulation efficiency and energy utilization rate are improved. The circulating waste liquid discharged during the circulation process is input into the waste heat recovery heat exchanger together with the cooling water for heat exchange, realizing the recovery and utilization of the waste heat. The circulating waste liquid after heat exchange is transported to the circulation pool 29, and the cooling water is transported to the circulating cooling water to participate in the next cycle.

[0109] Specifically, a humidification and dehumidification saline waste liquid concentration system includes a concentrating device, wherein the concentrating device is configured as a first concentrating device arranged at the head end, at least one second concentrating device arranged in the middle section, and a third concentrating device arranged at the end, wherein the concentrating device is any one of the concentrating devices described above;

[0110] The upper shell of the humidification chamber 1 of the second concentrating device is further provided with a second humidification chamber water vapor outlet 63, and the lower shell of the humidification chamber 1 is further provided with a second humidification chamber air supply inlet 64.

[0111] The upper portion of the shell of the dehumidification chamber 24 of the second concentrating device is further provided with a second dehumidification chamber water vapor inlet 65, and the lower portion of the shell of the dehumidification chamber 24 is further provided with a second dehumidification chamber water vapor outlet 66;

[0112] The upper shell of the humidification chamber 1 of the third concentrating device is further provided with a second humidification chamber water vapor outlet 63, and the lower shell of the humidification chamber 1 is further provided with a second humidification chamber air supply inlet 64.

[0113] The upper portion of the shell of the dehumidification chamber 24 of the third concentrating device is further provided with a second dehumidification chamber water vapor inlet 65, and the lower portion of the shell of the dehumidification chamber 24 is further provided with a second dehumidification chamber water vapor outlet 66;

[0114] in:

[0115] The connecting channel 60 of the first concentrating device connects the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 with the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, so that water vapor is discharged from the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 to the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, and then enters the third cavity of the shell of the dehumidification chamber 24.

[0116] The circulating waste liquid inlet 2 of the upper shell of the humidification tank 1 of the subsequent-stage concentrating device is connected to the circulating waste liquid discharge outlet 15 of the lower shell of the humidification tank 1 of the previous-stage concentrating device, so that the saline waste liquid discharged from the circulating waste liquid discharge outlet 15 of the humidification tank 1 of the previous-stage concentrating device passes into the circulating waste liquid inlet 2 of the humidification tank 1 of the subsequent-stage concentrating device to enter the first cavity of the upper shell of the humidification tank 1 of the subsequent-stage concentrating device;

[0117] The cooling water outlet 23 of the cooling member in the third cavity of the dehumidification chamber 24 of the subsequent-stage concentrating device is connected to the cooling water inlet 21 of the cooling member in the third cavity of the dehumidification chamber 24 of the previous-stage concentrating device, so that the water output from the cooling water outlet 23 of the cooling water member in the third cavity of the dehumidification chamber 24 of the subsequent-stage concentrating device passes into the cooling water inlet 21 of the cooling member in the third cavity of the dehumidification chamber 24 of the previous-stage concentrating device, and enters the cooling member in the third cavity of the dehumidification chamber 24 of the previous-stage concentrating device, so as to condense the water vapor in the third cavity;

[0118] The second dehumidification chamber water vapor inlet 65 on the upper portion of the shell of the dehumidification chamber 24 of the subsequent-stage concentrating device is connected to the first dehumidification chamber water vapor outlet 59 on the lower portion of the shell of the dehumidification chamber 24 of the previous-stage concentrating device, so that the water vapor discharged from the first dehumidification chamber water vapor outlet 59 on the lower portion of the shell of the dehumidification chamber 24 of the previous-stage concentrating device passes into the second dehumidification chamber water vapor inlet 65 on the upper portion of the shell of the dehumidification chamber 24 of the subsequent-stage concentrating device, and enters the third cavity of the shell of the dehumidification chamber 24 of the subsequent-stage concentrating device.

[0119] The second humidification chamber water vapor outlet 63 of the upper shell of the humidification chamber 1 of the subsequent-stage concentrating device is connected to the first humidification chamber air supply inlet 62 of the lower shell of the humidification chamber 1 of the previous-stage concentrating device, so that the water vapor discharged from the second humidification chamber water vapor outlet 63 of the upper shell of the humidification chamber 1 of the subsequent-stage concentrating device passes into the air supply inlet 62 of the lower shell of the first humidification chamber of the humidification chamber 1 of the previous-stage concentrating device, enters the second cavity of the lower shell of the humidification chamber 1 of the previous-stage concentrating device, and further passes into the first cavity of the upper shell of the humidification chamber 1 of the previous-stage concentrating device;

[0120] The connecting channel 60 of the second concentrating device connects the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 with the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, so that water vapor is discharged from the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 to the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, and then enters the third cavity of the shell of the dehumidification chamber 24.

[0121] The second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the second concentrating device is connected to the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1 through an air supply pipe 67. A blowing component is provided in the air supply pipe 67. The air outlet of the blowing component in the air supply pipe 67 is directed toward the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1, so that the water vapor discharged from the second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the second concentrating device passes into the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1, so as to enter the second cavity of the lower shell of the humidification chamber 1 and further pass into the first cavity of the upper shell of the humidification chamber 1;

[0122] The connecting channel 60 of the third concentrating device connects the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 with the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, so that water vapor is discharged from the first humidification chamber water vapor outlet 57 of the upper shell of the humidification chamber 1 to the first dehumidification chamber water vapor inlet 58 of the upper shell of the dehumidification chamber 24, and then enters the third cavity of the shell of the dehumidification chamber 24.

[0123] The second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the third concentrating device is connected to the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1 through an air supply pipe 67. A blowing component is provided in the air supply pipe 67. The air outlet of the blowing component in the air supply pipe 67 is directed toward the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1, so that the water vapor discharged from the second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the third concentrating device passes into the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1, so as to enter the second cavity of the lower shell of the humidification chamber 1, and further pass into the first cavity of the upper shell of the humidification chamber 1.

[0124] For the series cascade solution, the humidification and dehumidification saline wastewater concentration method includes the following steps:

[0125] The saline waste liquid is introduced into the upper shell through the circulating waste liquid inlet 2 of the upper shell of the humidification bin 1 of the first concentrating and crystallizing device and sprayed by the spraying member to form water vapor and saline droplets. The saline droplets drip into the second cavity of the lower shell along the axial direction of the shell, and the second cavity of the lower shell gathers the saline droplets.

[0126] The water vapor of the first concentrating crystallization device is discharged from the first humidifying chamber water vapor outlet 57 of the upper shell of the humidifying chamber 1 and is passed into the first dehumidifying chamber water vapor inlet 58 on the upper part of the shell of the dehumidifying chamber 24 to enter the third cavity of the shell of the dehumidifying chamber 24;

[0127] The saline waste liquid discharged from the circulating waste liquid discharge outlet 15 of the humidifying bin 1 of the previous stage concentrating crystallization device is passed into the circulating waste liquid inlet 2 of the humidifying bin 1 of the next stage concentrating crystallization device to enter the first cavity of the upper shell of the humidifying bin 1 of the next stage concentrating crystallization device;

[0128] The water outflow from the cooling water outlet 23 of the cooling water component in the third cavity of the dehumidification bin 24 of the subsequent stage concentrating crystallization device is passed into the cooling water inlet 21 of the cooling component in the third cavity of the dehumidification bin 24 of the previous stage concentrating crystallization device, and then enters the cooling component in the third cavity of the dehumidification bin 24 of the previous stage concentrating crystallization device, so as to condense the water vapor in the third cavity;

[0129] The water vapor discharged from the first dehumidification chamber water vapor outlet 59 at the lower part of the shell of the dehumidification chamber 24 of the previous stage concentration and crystallization device is passed into the second dehumidification chamber water vapor inlet 65 at the upper part of the shell of the dehumidification chamber 24 of the next stage concentration and crystallization device, and then enters the third cavity of the shell of the dehumidification chamber 24 of the next stage concentration and crystallization device;

[0130] The water vapor discharged from the second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the third concentrating crystallization device is passed into the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1 to enter the second cavity of the lower shell of the humidification chamber 1, and further into the first cavity of the upper shell of the humidification chamber 1;

[0131] The water vapor discharged from the second humidification bin water vapor outlet 63 of the upper shell of the humidification bin 1 of the subsequent stage concentrating and crystallizing device passes into the air supply inlet 62 of the lower shell of the first humidification bin of the humidification bin 1 of the previous stage concentrating and crystallizing device, so as to enter the second cavity of the lower shell of the humidification bin 1 of the previous stage concentrating and crystallizing device, and further passes into the first cavity of the upper shell of the humidification bin 1 of the previous stage concentrating and crystallizing device;

[0132] in,

[0133] The water vapor in the humidification chamber 1 of the second concentrating crystallization device is discharged from the first humidification chamber water vapor outlet 57 of the upper shell and enters the first dehumidification chamber water vapor inlet 58 on the upper part of the shell of the dehumidification chamber 24 to enter the third cavity of the shell of the dehumidification chamber 24;

[0134] The water vapor discharged from the second dehumidification chamber water vapor outlet 66 at the lower part of the shell of the dehumidification chamber 24 of the second concentrating crystallization device is passed into the second humidification chamber air supply inlet 64 of the lower shell of the humidification chamber 1 to enter the second cavity of the lower shell of the humidification chamber 1, and further passes into the first cavity of the upper shell of the humidification chamber 1;

[0135] The water vapor in the humidification bin 1 of the third concentrating crystallization device is discharged from the first humidification bin water vapor outlet 57 of the upper shell into the first dehumidification bin water vapor inlet 58 on the upper part of the shell of the dehumidification bin 24 to enter the third cavity of the shell of the dehumidification bin 24.

[0136] Furthermore, the first heat exchanger exchanges heat between the outlet water of the cooling member in the third cavity of the shell of the first concentrating and crystallizing device and the circulating waste liquid discharged from the circulating waste liquid discharge outlet 15 of the third concentrating and crystallizing device to increase the heat of the circulating waste liquid;

[0137] The circulating waste liquid pump 27 extracts the circulating waste liquid in the circulating pool 29 and the external saline waste liquid;

[0138] The second heat exchanger exchanges heat between the extracted circulating waste liquid and the external saline waste liquid and the heat source to increase the heat of the extracted circulating waste liquid;

[0139] The circulating waste liquid is introduced into the circulating waste liquid inlet 2 of the shell of the first concentration crystallization device.

[0140] On the basis of multiple cycles of humidification and dehumidification, the filler in the first cavity of the upper shell of each humidification chamber 1 can be taken out when the machine is stopped, and vibrated to collect salt crystals covering the surface of the filler.

[0141] For the series cascade solution, due to the large circulation of cold air and water vapor formed above, and due to the fact that the gas of the large circulation is transferred from the lower level to the upper level in the humidification bins 1 of the humidification, dehumidification and concentration crystallization devices of different levels, heat is gradually released and the temperature gradually increases. This results in a temperature difference between the humidification bins 1 of the humidification, dehumidification and concentration crystallization devices of different levels, that is, the temperature ranges of different humidification bins 1 are different. This allows different types of salts that are sensitive to temperature precipitation to precipitate and adhere to the filler 42 in the humidification bins 1 of the temperature range corresponding to the temperature difference. After the reaction is completed, the filler 42 of the humidification bins 1 of the humidification, dehumidification and concentration crystallization devices of different levels can be processed, and each humidification bin 1 can obtain salt crystals of a relatively single type. That is, the temperature between the humidification, dehumidification and concentration crystallization devices of different levels of the present invention is different. By utilizing the different solubility of different salts or volatile substances at different temperatures, the separation of different salts and different volatile substances is achieved in the devices of each level.

[0142] Example 2: Figure 3 In this embodiment, in order to achieve high-concentration brine concentration and desalination and recover solid waste salt, a multi-stage humidification and dehumidification saline waste liquid concentration system and device are connected in parallel, including: a heat source 25, a heating heat exchanger 26, a circulating waste liquid pump 27, a waste liquid stock 28, a circulating pool 29, a cooling water pump 31, circulating cooling water 32, a first-stage humidification and dehumidification saline waste liquid concentration and crystallization device 33, a second-stage humidification and dehumidification saline waste liquid concentration and crystallization device 34, a third-stage humidification and dehumidification saline waste liquid concentration and crystallization device 35, a fourth-stage humidification and dehumidification saline waste liquid concentration and crystallization device 36, a fifth-stage humidification and dehumidification saline waste liquid concentration and crystallization device 37, and a centrifugal crystallizer 38.

[0143] The first-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device includes: a humidification chamber 1 and a dehumidification chamber 24.

[0144] The original waste liquid is piped to a circulation tank 29 for thorough mixing. The circulating waste liquid in the circulation tank 29 is then pumped by a circulating waste liquid pump 27 to a heating heat exchanger 26 for heat exchange with a heat source. The heated waste liquid is then simultaneously pumped to each level of the humidification tank 1. Cooling water is pumped by a cooling water pump 31 to each level of the dehumidification tank 24. The circulating waste liquid from each level of the humidification tank 1 is collected and concentrated in a centrifugal crystallizer 38 for sedimentation and crystallization. The supernatant after crystallization is then returned to the circulation tank 29 for thorough mixing before the next cycle. The cooling water from each level of the dehumidification tank 24 is then returned to the circulating cooling water.

[0145] The internal structures of the humidification chamber 1 and the dehumidification chamber 24 are the same as those in Example 1.

[0146] In the humidification and dehumidification salt wastewater concentration and crystallization device at each level, the humidification chamber 1 is connected to the dehumidification chamber 24, and the first humidification chamber water vapor outlet 57 (hot air outlet) of the humidification chamber 1 is connected to the first dehumidification chamber water vapor inlet 58 (hot air inlet) of the dehumidification chamber 24. The first humidification chamber air supply inlet 62 (cold air inlet) of the humidification chamber 1 is connected to the first dehumidification chamber water vapor outlet 59 (cold air outlet) of the dehumidification chamber 24.

[0147] The above-mentioned multi-stage humidification and dehumidification salt-containing waste liquid concentration system and device are used to concentrate the waste liquid, including the following steps:

[0148] The waste liquid is piped to a circulation tank 29, where it is then pumped by a circulating waste liquid pump 27 to a heating heat exchanger 26 for heat exchange with a heat source 25. The heated circulating waste liquid is then piped to the humidification chamber 1 of each humidification, dehumidification, and salt-containing wastewater concentration and crystallization unit. The waste liquid is sprayed into the humidification chamber 1 by a sprayer 3. As it falls, it collides with the filler 11, forming fine droplets that are evenly distributed throughout the humidification chamber 1. Excess circulating waste liquid collects at the bottom of the humidification chamber 1 and is discharged into a centrifugal crystallizer 38. After centrifugal crystallization, crystallized salt and high-concentration wastewater are produced. The high-concentration circulating waste liquid is then transported back to the circulation tank 29 to be fully mixed with the low-concentration wastewater for the next concentration step. Cooling water is then pumped by a cooling water pump 31 to the dehumidification chamber 24 of each humidification, dehumidification, and salt-containing wastewater concentration and crystallization unit, flowing from bottom to top through the cooling pipes. The outflowing cooling water is then returned to the circulating cooling water. The fan drives the cold air in the dehumidification chamber 24 into the first humidification chamber air supply inlet 62 (cold air inlet) below the humidification chamber 1. As the cold air rises, it is gradually heated and humidified. Hot air (water vapor) enters from above the dehumidification chamber 24 and gradually cools down as it descends. The water vapor it carries condenses into fresh water, and the cooled and dehumidified air enters the next cycle.

[0149] Example 3: Figure 4In order to directly recover and utilize the condensed fresh water, the dehumidification structure of the dehumidification bin can be replaced with a spray type. The cooling pipe 22 is removed from the original structure, and a spray head B39, a block B40, a baffle B41, and a filler B42 are added. The operating principle of the device is similar to that of Example 2. The humidification and dehumidification salt-containing waste liquid concentration and crystallization device at each level includes: a humidification bin 1 and a dehumidification bin 24. The waste liquid in the humidification bin 1 is heated and sprayed. Under the action of the fan, the cold air moves from bottom to top in the humidification bin, carrying a large amount of water vapor while heating. Baffles B40 and block B41 are provided inside the dehumidification bin, and filler B42 is placed on the baffle to fill the internal space of the dehumidification bin. The circulating cooling water is passed into the spray head B, and the cooling water is sprayed into the dehumidification bin 1. The cooling water collides with the filler, which increases the contact area between the cooling water and the air and improves the cooling efficiency. The hot air outlet of humidification chamber 1 is connected to the hot air inlet of dehumidification chamber 24. The hot air flows from top to bottom inside dehumidification chamber 24, gradually cooling, and the water vapor it carries is condensed into fresh water. The sprayed cooling water and condensed fresh water gather at the bottom of dehumidification chamber 24 and flow back into the circulating cooling water.

[0150] A factory needed to concentrate the alkali salts in its wastewater, but also remove excess ammonia. Therefore, a spray dehumidification chamber was used to concentrate the wastewater. Alkali salts are soluble, and ammonia's solubility in water decreases with increasing temperature. After the wastewater is heated, excess ammonia escapes and flows into the dehumidification chamber with the hot, humid air. During the dehumidification process, the temperature drops, and the ammonia in the air dissolves in the sprayed cooling water before being discharged with the cooling water.

[0151] Example 4: Figure 5 The humidification and dehumidification salt-containing waste liquid concentration and crystallization device has the same structure as the first-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device in Example 2. The monitoring system includes: heater circulating waste liquid discharge outlet temperature 43, heater circulating waste liquid inlet temperature 44, heater waste liquid outlet temperature 45, heater circulating waste liquid inlet temperature 46, circulating waste liquid flow rate 47, waste liquid temperature 48, circulating pool temperature 49, circulating waste liquid inlet temperature 50, wind speed 51, cold air temperature 52, cooling water inlet temperature 53, cooling water flow rate 54, cooling water outlet temperature 55, hot air temperature 56. In this embodiment, the circulating waste liquid flow rate is controlled at 10m 3 The flow rate of waste liquid into the circulation pool is 1m 3 The temperature of the circulating waste liquid flowing into the heating heat exchanger is 70°C, and the outflow temperature is 90°C. The heated circulating waste liquid flows into the humidification and dehumidification salt-containing waste liquid concentration and crystallization device for concentration. The concentrated circulating waste liquid drops to 45°C and is passed into the centrifugal crystallizer for crystallization and sedimentation. The supernatant flows into the waste heat recovery heat exchanger, and after the temperature rises to 70°C, it flows into the circulation pool. In the circulation pool, the 50°C waste liquid and the 70°C circulating waste liquid are fully mixed, where the flow rate of the circulating waste liquid is 10 times that of the waste liquid. After full mixing, the temperature is close to 70°C, and the next cycle is carried out.

[0152] The solutions in the above embodiments 1-4 have the following beneficial effects:

[0153] In a first aspect, the present invention aims to solve the problem of promoting the flow of water vapor and improving the concentration efficiency.

[0154] On the second aspect, a gap is set between each group of resistance wires to allow salt droplets to pass through. The resistance wires are vertically bent along the dripping stroke of the salt droplets and are set inside the humidification chamber, so that the dripping droplets in the humidification chamber are always in a heated state, thereby increasing the amount of water vapor generated. The cooling pipes are vertically bent along the dripping stroke of the water droplets and are set inside the dehumidification chamber. A gap is set between each group of cooling pipes to allow water droplets to pass through, so that the falling water vapor in the dehumidification chamber is always in a cooling state, thereby increasing the amount of fresh water generated.

[0155] On the third aspect, the concentration system of the present invention is composed of a multi-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device. The number of stages can be freely increased or decreased, and it is suitable for production of various scales. The humidification and dehumidification salt-containing waste liquid concentration and crystallization devices at each stage can be connected in series or in parallel. In the first direction of the third aspect, the present invention can achieve different levels of humidification and dehumidification salt-containing waste liquid concentration and crystallization devices. The humidification bins are in different temperature ranges in different humidification bins through the series mode, and different types of salts that are sensitive to precipitation temperature can be obtained. That is, the temperatures between the humidification and dehumidification salt-containing waste liquid concentration and crystallization devices at each stage of the present invention are different. By utilizing the different solubilities of different salts or volatile substances at different temperatures, the separation of different salts and different volatile substances is achieved in the devices at each stage. Furthermore, waste heat recovery can be carried out and the waste heat can be involved in the circulation. The present invention effectively recovers the waste heat in the cooling water by exchanging heat between the circulated low-temperature waste liquid and the high-temperature cooling water, thereby improving energy utilization. In the second direction of the third aspect, the present invention focuses on the desalination function of the waste liquid through a parallel mode. The concentrated waste liquid is passed into a centrifugal crystallizer and crystallized outside the device to reduce scaling inside the device.

[0156] In the fourth aspect, an internal auxiliary circulation can be set between the humidification chamber and the dehumidification chamber of the present invention. During the circulation process of the main device, the intermediate-stage humidification and dehumidification salt-containing waste liquid concentration and crystallization device extracts a part of the air for internal circulation, making full use of the humidified air, and effectively improving the humidification and dehumidification efficiency and energy utilization rate.

[0157] In the fifth aspect, the present invention installs an auxiliary heater in the humidification chamber to continuously heat the circulating waste liquid and air. An air preheater is added to the cold air inlet, and the air is passed into the humidification chamber after the waste heat is removed, thereby improving the overall heating efficiency of the device.

[0158] Sixth, the system features a modular, multi-stage structure, waste heat recovery, and the ability to concentrate saline wastewater using low-grade heat sources. The device and equipment can operate from a wide range of energy sources, including waste heat and steam from industrial production, as well as low-grade heat sources such as solar, wind, and geothermal energy.

[0159] Example 5: Chemical industry wastewater has complex components and contains a large amount of inorganic salts, so it has high requirements for treatment equipment and technology. Thermal desalination technologies such as humidification and dehumidification (HDH) include a humidification chamber and a dehumidification chamber. The humidification chamber sprays the wastewater (feed liquid) to form a concentrate and water vapor. The water vapor flows through the pipe to the dehumidification chamber and condenses into water, thereby reducing the amount of wastewater. In order to promote the mass and heat transfer inside the humidifier, porous fillers are often used inside the humidifier to break up the wastewater droplets. However, as the desalination process proceeds, the deposited crystals and dirt will cause pipe blockage, which will reduce the desalination performance of the system. That is, during the desalination process, the evaporation of water and the change in the temperature of the concentrate will cause the nucleation and growth of crystals with inorganic substances as the main component, and the dirt composed of colloidal particles in the wastewater will be affected by the van der Waals force, causing the crystals and dirt to accumulate on the surfaces of structures such as pipes, fillers and shells.

[0160] Most of the crystals and dirt in the wastewater have colloidal properties. They not only interact with each other during movement, but also undergo adsorption with the surfaces they come into contact with. As the desalination process progresses, the number of collisions between solid substances such as crystals and dirt increases, the collision frequency becomes higher and higher, and the probability of solid substances aggregating together also becomes higher and higher, causing blockage of the system and pipelines. In HDH technology, porous fillers are used to break up and spread droplets, thereby increasing the evaporation area. However, the dirt in the wastewater will settle and accumulate in the pores of the fillers, and at the same time, the increasing salinity also promotes the nucleation and growth of crystals.

[0161] At present, the methods of decrystallization include using acids and alkalis to perform crystallization and regular chemical cleaning of the desalination system for dirt, but this consumes a large amount of chemicals, cannot achieve zero emissions in the true sense, and does not directly achieve decrystallization. In thermal desalination technology, the concentrated liquid after decrystallization should be maintained at a certain temperature so that it can continue to enter the desalination system for evaporation. Therefore, the freeze crystallization method that uses the property of crystal saturation changing with temperature to perform decrystallization is not applicable to thermal desalination. The commonly used decrystallization method is to add an evaporation crystallizer outside the desalination system to decrystallize the wastewater that has been concentrated to a near-saturated state. The boiling point of the concentrate is lowered by reducing pressure, and the evaporation crystallizer uses centrifugation and evaporation to separate the solid particles and liquid in the concentrate, thereby achieving decrystallization. For example, application No. 201611214327.4 discloses a dual-thermal-mass coupled solar hot air evaporation system and method thereof. The system recovers water vapor and the corresponding sensible and latent heat from the humid air, but the remaining concentrated solution is directly discharged without recycling. The system has difficulties in handling high-salt solutions in actual operation, and no solution is proposed to the phenomenon of crystallization and scaling generated when the high-salt solution evaporates in the evaporator.

[0162] Furthermore, the evaporative crystallizer is powered by electricity and high-temperature steam, and its internal scraper removes any adhering materials. However, the equipment investment for the evaporative crystallizer can account for 15%-16% of the total system investment. HDH technology utilizes plant waste heat for desalination. When combined with the evaporative crystallizer, the evaporative crystallizer consumes the majority of the system's electricity and heat. Furthermore, the conditions and quantity of desalination using the evaporative crystallizer are subject to environmental constraints.

[0163] From the above, the heat source of HDH thermal desalination technology can be the large amount of waste heat in the factory, and HDH itself is made of plastic and is insensitive to highly corrosive wastewater. HDH has economic feasibility and high energy utilization in the field of desalination. Although the problems of crystallization and fouling inside the humidifier can be solved by adding an evaporation crystallizer externally or performing regular chemical cleaning, it is limited by the environment and energy sources and cannot truly achieve zero emissions directly. Therefore, finding a simple and effective de-crystallization method in HDH thermal desalination technology is extremely important to improve energy utilization and achieve zero emissions.

[0164] like Figure 6 The present invention uses vibration to remove crystals from a humidification, dehumidification, and desalination system, particularly a humidification chamber of a desalination system. This method involves installing a vibrator 1-9 inside the humidifier to vibrate the filler 1-4 and the housing 1-2, thereby removing crystals directly within the humidifier through a physical vibration method.

[0165] In this method, the vibrators 1-9 are easy and convenient to install, and the vibration is simple and efficient to achieve decrystallization without affecting the interior of the humidifier (also known as the humidification chamber). Compared with the decrystallization methods in previous thermal desalination technologies, such as regular chemical cleaning and evaporative crystallizer crystallization.

[0166] In one embodiment, a humidification chamber for humidification-dehumidification desalination capable of vibration decrystallization includes a shell 1-2, a spray component, a filler 1-4, a vibrator 1-9, and a circulation pump.

[0167] The shell 1-2 includes an upper shell 1-2, a lower shell 1-2 and a porous plate 1-55, wherein the upper shell 1-2 is provided with a liquid inlet and a water vapor outlet. Preferably, the liquid inlet is used for inputting liquid and is provided at the upper part of the upper shell 1-2, such as the upper part on the left side of the upper shell 1-2. The water vapor outlet is used for discharging water vapor formed by spraying and / or decomposition, usually to the dehumidification bin, and is provided at the upper part of the upper shell 1-2, such as the upper part on the right side of the upper shell 1-2. The lower shell 1-2 is provided with a liquid outlet and an air duct opening 1-1010. Preferably, the liquid outlet is used for discharging concentrated liquid formed by evaporation of water from the liquid and is provided at the lower part of the lower shell 1-2, such as the lower part on the left side of the lower shell 1-2. The air duct opening 1-1010 is used for providing external fresh air or recycled fresh air into the shell 1-2, which can accelerate the flow of water vapor and is provided at the lower part of the lower shell 1-2, such as the lower part on the right side of the lower shell 1-2.

[0168] In which, a first cavity is formed inside the upper shell 1-2, and a second cavity is formed inside the lower shell 1-2, and the porous plate 1-55 separates the first cavity from the second cavity. It can be understood that the upper and lower shells 1-2 can be an integrated sealed cavity structure, which is separated by the porous plate 1-55 inside the shell 1-2.

[0169] The spraying component is connected to the liquid inlet of the upper shell 1-2, spraying the liquid toward the first cavity, spraying to form water vapor and liquid droplets, the water vapor flows toward the dehumidification bin, the liquid droplets are concentrated liquid, and are discharged from the liquid outlet on the lower shell 1-2.

[0170] The filler 1-4 is filled in the first cavity below the spray component, and the vibrator 1-9 is arranged in the first cavity filled with the filler 1-4, so that the vibration formed by the vibrator 1-9 on the filler 1-4 and the shell 1-2 causes the crystals of the liquid on it to fall off. On the one hand, it can reduce the risk of blockage. On the other hand, in this way, the crystals can fall off and fall into the concentrated liquid tank 1-7 for holding the liquid droplets of the lower shell 1-2 below, thereby realizing the collection of the crystallized salt.

[0171] Wherein, the humidification bin further comprises a circulation pump, the circulation pump is arranged outside the humidification bin, the inlet of the circulation pump is connected to the feed liquid outlet through a pipeline, the outlet of the circulation pump is connected to the feed liquid inlet (hot feed liquid inlet 1-11) through a pipeline, so that the feed liquid circulates between the feed liquid outlet (hot feed liquid outlet 1-66), the circulation pump and the feed liquid inlet, that is, a hot feed liquid circulation system of the present invention is formed, through the above-mentioned hot feed liquid circulation system, a feed liquid addition port can be provided in the pipeline provided outside the shell 1-2, that is, new external feed liquid is supplied to the circulating feed liquid, for the above-mentioned circulation, the crystallized salt can be collected in the lower shell 1-2, and the feed liquid decrystallization is deeper and more thorough. Preferably, a preheater is provided in the hot feed liquid circulation system, which can be provided on the pipeline between the circulation pump outlet and the feed liquid inlet, and the feed liquid can be further heated.

[0172] In the present invention, the vibrator 1-9 is formed in a vibration system, and the vibration system includes: a vibrator 1-9 (9), a vibration fixing seat 1-88 (8), a fixed bracket, a vibration controller and an electrical box, wherein the vibrator 1-9 (9) is fixed in the interior of the humidifier by the fixed bracket and is staggered on both sides. The vibration fixing seat 1-88 (8) is directly connected to the vibrator 1-9 (9) and has a porous shape. The vibrator 1-9 (9) is connected to the vibration controller, and the vibration controller is located outside the humidifier. Of course, in some solutions, the vibrator 1-9 and the controller can be connected wirelessly, which can avoid the opening of the housing 1-2.

[0173] The hot liquid circulation system includes: a hot liquid inlet 1-11 (1), a hot liquid outlet 1-66 (2), and a circulation pump preheater. In some examples, the shell 1-2 is cylindrical in shape.

[0174] In some examples, the shell 1-2 is made of one or a combination of two or more of stainless steel, polypropylene, polyethylene, polyvinyl chloride or fiberglass; the shell 1-2 is wrapped with insulation material on the outside, which has the functions of heat preservation and corrosion resistance.

[0175] In some embodiments, the vibration mount 1-88 is made of one or a combination of stainless steel, polypropylene, polyethylene, polyvinyl chloride, or fiberglass. Preferably, the vibration mount 1-88 is porous, with a through hole large enough to allow the crystal to pass through. More preferably, the vibration mount 1-88 has a shape of one or a combination of two or more of a semicircular, fan-shaped, or square. More preferably, the vibration mount 1-88 is connected to the vibrator 1-9 by bolts and nuts or welding.

[0176] In some examples, the vibration mode of the vibrator 1-9 includes but is not limited to an internal vibrator 1-9, an external vibrator 1-9 or a surface vibrator 1-9, and a pneumatic vibrator 1-9 is particularly preferred, such as a GT wheel vibrator 1-9, an R roller vibrator 1-9 or a TVP piston vibrator 1-9. Preferably, the vibration frequency of the vibrator 1-9 is low frequency, medium frequency or high frequency. Preferably, the principles of the vibrator 1-9 include eccentric, planetary, reciprocating, electromagnetic or piston. Preferably, the power source of the vibrator 1-9 is electric, internal combustion or pneumatic. Preferably, the material of the vibrator 1-9 is one or a combination of iron, copper, titanium, aluminum, hot-dip galvanizing or stainless steel. Preferably,

[0177] In some examples, the fixing bracket material is one or a combination of two or more of stainless steel, polypropylene, polyethylene, polyvinyl chloride or fiberglass.

[0178] In some examples, the overflow trough 1-33 is made of one or a combination of two or more of polypropylene, polyethylene or polyvinyl chloride. Preferably, the overflow trough 1-33 is square or circular in shape, and the holes are circular, square or triangular.

[0179] In some examples, parameters controlled by the vibration controller include but are not limited to vibration frequency, vibration amplitude, and vibration time.

[0180] In some examples, the porous plate 1-55 is made of one or a combination of two or more of polypropylene, polyethylene or polyvinyl chloride. Preferably, the pores in the porous plate 1-55 are circular, square or triangular.

[0181] In some embodiments, the fillers 1-4 are one or a combination of two or more of the following: plastic fillers 1-4, ceramic fillers 1-4, and fiberglass reinforced plastic fillers 1-4. Preferably, the fillers 1-4 are in the shape of one or a combination of two or more of the following: Raschig rings, Pall rings, stepped rings, arc saddles, rectangular saddles, ring-rectangular saddles, and spheres.

[0182] In some examples, the connecting pipe is made of one or a combination of two or more of polypropylene, polyethylene, or polyvinyl chloride, and the outside of the pipe is wrapped with insulation material.

[0183] In some examples, the humidification, dehumidification and desalination system of the present invention uses steam, solar energy, factory waste heat, ship engine exhaust waste heat or electric heating as the energy source for heating.

[0184] The present invention directly vibrates and decrystallizes the filler 1-4 and the walls of the housing 1-2 within the humidifier. Crystallized scale adhered to the surface of the filler 1-4 is dislodged from the surface and falls through the holes in the mounting base. The vibrationally dislodged scale accumulates in the concentrate tank 1-7. Because the concentrate is supersaturated at this point, the precipitated scale settles at the bottom of the concentrate tank 1-7. The deposited scale in the concentrate tank 1-7 can be processed by conveyor belts or manually collected, achieving desalination collection.

[0185] The desalination method of the present invention does not require additional crystallization equipment, reducing the floor space occupied by the system equipment. The vibration of the present invention achieves decrystallization without consuming chemical reagents or drugs, and promotes the recycling of salt and water. The vibrator 1-9 of the present invention is made of corrosion-resistant materials, which improves the safety and reliability of the system operation. The frequency, amplitude and time of the vibration of the present invention can be controlled through automation, which provides feasibility for the automated application and promotion of desalination technology. The vibration of the present invention can achieve continuous operation with the desalination system, truly and directly achieving zero emissions. The filler 1-4 and the shell 1-2 of the present invention are made of non-toxic non-metallic materials, and the equipment investment, operation and maintenance costs are far lower than traditional thermal technology, which is highly competitive. The power source of the vibrator 1-9 of the invention can include electrical energy, and can also be combined with clean energy such as solar energy and hydrogen energy. The present invention has the characteristics of practicality, durability and high efficiency.

[0186] In the above scheme, the present invention has the following effects:

[0187] 1. The vibrator 1-9 of the present invention is arranged in the first cavity filled with the filler 1-4, and uses vibration to perform decrystallization, directly separating the solid and liquid on the surface of the filler 1-4 and the wall of the shell 1-2, thereby improving the heat and mass transfer of the liquid.

[0188] 2. The vibration de-crystallization method of the present invention can effectively prevent blockage inside the humidifier and in the pipeline, thereby improving the stability of the desalination system and increasing the continuous operation time.

[0189] 3. The vibration decrystallization method of the present invention does not require additional crystallization equipment, consumes no chemical reagents or drugs, and does not require pretreatment of wastewater, thus reducing the number of steps in the desalination process.

[0190] 4. The vibration decrystallization method of the present invention causes the crystalline scale attached to the surface of the packing 1-4 to fall off from the surface and drop through the through-holes of the fixing base. The vibration-dislodged crystalline scale accumulates in the concentrate tank 1-7 (lower housing 1-2). Since the concentrate is in a supersaturated state at this time, the precipitated crystalline scale material will settle at the bottom of the concentrate tank 1-7, thereby improving the concentration ratio of the desalination system, promoting the recycling of salt and water, and increasing the water production rate, truly and directly achieving zero emissions.

[0191] 5. The present invention makes the vibrator 1-9 arranged on the first fixed seat distributed on the first side of the first cavity of the upper shell 1-2, and the vibrator 1-9 arranged on the second fixed seat distributed on the second side of the first cavity of the upper shell 1-2, so that the vibrator 1-9 can be alternately arranged on both sides of the first cavity to achieve uniformity of vibration decrystallization.

[0192] 6. The fixing seat of the present invention has through holes that allow liquid droplets and fillers 1-4 to pass through, and the obstructive effect of the solid part is equivalent to extending the path of water vapor or droplets, which is equivalent to extending the vaporization time, so that the fresh air entering from the air duct openings 1-10 can more fully promote the upward flow of water vapor.

[0193] 7. The vibrators 1-9 of the present invention are easy to install and maintain, and the equipment is easy to process and manufacture, which increases the range of application sites.

[0194] In one approach, Figure 6 The humidification chamber of the humidification and dehumidification desalination type capable of vibration decrystallization comprises a hot liquid circulation system, a shell 1-2, an overflow tank 1-33, a filler 1-4, a porous plate 1-55, a vibration system, a concentrated liquid collection tank and an air duct port 1-1010.

[0195] The vibration system includes a vibrator 1-9, a vibration mounting base 1-88, a fixing bracket, a vibration controller, and an electrical box. The vibrator 1-9 is fixed inside the humidifier by the fixing bracket and is staggered on both sides. The vibration mounting base 1-88 is directly connected to the vibrator 1-9, and the vibration mounting base 1-88 has a porous shape. The vibrator 1-9 is connected to the vibration controller, and the vibration controller is located outside the humidifier.

[0196] The hot liquid circulation system includes: a hot liquid inlet 1-11, a hot liquid outlet 1-66, a circulation pump and a preheater.

[0197] The method for thermal desalination using the above device comprises the following steps:

[0198] A circulating pump connects the hot liquid inlet 1-11 to the preheater outlet. The preheater heats the wastewater. Once heated, the circulating pump pumps the wastewater (liquid) into the overflow trough 1-33. The overflow trough 1-33 is designed to effectively prevent blockage caused by crystallization or scaling during the spraying process. The filler 1-4 breaks up and spreads the wastewater, thereby increasing the evaporation area.

[0199] After running for a period of time, the vibrator 1-9 is started, and the vibration fixing seat 1-88 connected to the vibrator 1-9 will vibrate the filler 1-4. The frequency, time, amplitude and other parameters of the vibration of the vibrator 1-9 are adjusted to make the crystals on the surface of the filler 1-4 and the wall of the shell 1-2 fall off, thereby preventing blockage and other problems caused by the accumulation of solid materials such as crystal scaling.

[0200] Crystallized scale deposited on the surface of packing 1-4 will fall off the surface and drop through the holes in the mounting base. The vibration-dislodged crystallized scale will accumulate in the concentrate tank 1-7. Since the concentrate is now supersaturated, the precipitated crystallized scale will settle at the bottom of the concentrate tank 1-7. The crystallized scale deposited in the concentrate tank 1-7 can be collected manually or by conveyor belts for disposal.

[0201] In this embodiment, in order to further realize the automatic control of the device, the device is also equipped with an automatic control system including the start and stop of the circulation pump, flow detection, temperature inspection meter, vibration time and frequency control of vibrators 1-9, etc., among which the motors of vibrators 1-9 are individually controlled so that the start time, vibration frequency and interval time can be controlled.

[0202] In one embodiment, a humidification and dehumidification desalination system capable of vibration decrystallization includes a humidification chamber, a dehumidification chamber, and a connecting passage. The humidification chamber is provided with a water vapor outlet. The dehumidification chamber includes a cooling member, and the dehumidification chamber is provided with a water vapor inlet and a drain outlet. The connecting passage connects the water vapor outlet of the humidification chamber with the water vapor inlet of the dehumidification chamber.

[0203] Experimental Example 1: In this experimental example, the humidification and dehumidification desalination system with vibration decrystallization in Example 1 was selected as the experimental device. High-salt wastewater containing waste acid and waste alkali from a rare earth plant was selected as the feed liquid to be treated. High-temperature steam was introduced into the heat exchanger to heat the wastewater. The temperature of the hot feed liquid inlet 1-11 was stabilized at 90°C, and the valve and flow meter were adjusted to make the wastewater flow rate 10m 3 / h, and the cooling water used was tap water from a rare earth plant, with a stable tap water temperature of around 30°C. After the device ran stably for 1 hour, the system produced 60L / h of water. After several hours of continuous operation, the system produced a stable 40L / h of water.

[0204] Experimental Example 2: In this experimental example, the humidification and dehumidification desalination system with vibration decrystallization in Example 1 was selected as the experimental device. The waste liquid with high viscosity from a pharmaceutical factory was selected as the feed liquid to be treated. Steam was used to heat the hot feed liquid. The temperature of the hot feed liquid inlet 1-11 was maintained at 90°C, and the valve and flow meter were adjusted to make the wastewater flow rate 10m 3 / h, the cooling water is connected to the tap water pipe in the factory, and the temperature is about 35℃. After the device is stably running, the vibrators 1-9 are turned on every 30 minutes, and the water production rate is 40L / h. There is no blockage in the system, and the water quality meets the discharge standard.

[0205] The present invention belongs to the field of thermal desalination and involves the use of an oscillation method to decrystallize a humidification and dehumidification system. This method involves installing a vibrator 1-9 inside the humidifier to oscillate the filler 1-4 and the shell 1-2, thereby performing decrystallization directly within the humidifier through the physical method of oscillation. In this method, the oscillator is simple and convenient to install, and the oscillation is simple and efficient to achieve decrystallization without affecting the interior of the humidifier. Compared with the decrystallization methods used in previous thermal desalination technologies, the filler 1-4 and the wall surface of the shell 1-2 are directly oscillated and decrystallized inside the humidifier, eliminating the need for additional crystallization equipment and reducing the footprint of the system equipment. The oscillation does not consume chemical reagents or drugs, promoting the recycling of salt and water. The vibrator 1-9 made of corrosion-resistant materials improves the safety and reliability of the system operation. The frequency, amplitude, and time of the oscillation can be automatically controlled, providing feasibility for the automated application and promotion of desalination technology. The oscillation can achieve continuous operation with the desalination system, truly and directly achieving zero emissions.

[0206] Example 7: A combination of any of the schemes with vibrators 1-9 in Example 6 and any of the schemes in Examples 1-5, i.e., the vibrator (1-9) is arranged in the first cavity of the upper shell of the humidification chamber (1) filled with filler in any of the schemes in Examples 1-5. This scheme further allows the system to start the vibrator in the first cavity of the upper shell of the humidification chamber after a period of operation, and the vibration fixing seat connected to the vibrator vibrates the filler, causing crystals on the filler surface and the shell wall to fall off. The crystals attached to the filler surface fall off from the attached surface and fall through the holes of the vibration fixing seat and fall into the second cavity of the lower shell of the humidification chamber. The crystals that fall off due to vibration gather in the concentrated liquid tank at the bottom of the second cavity of the lower shell of the humidification chamber. The concentrated liquid tank contains concentrated liquid containing salt droplets. The concentrated liquid is in a supersaturated state. The precipitated crystals are deposited in the concentrated liquid tank for removal. This makes decrystallization and collection extremely convenient.

[0207] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0208] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0209] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0210] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0211] In the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0212] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0213] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A series saline wastewater concentration and crystallization system based on humidification and dehumidification, characterized in that: The invention comprises a concentration and crystallization device, wherein the concentration and crystallization device is configured as follows: The first concentration crystallization device is arranged at the head end, at least one second concentration and crystallization device disposed in the middle section, and A third concentration and crystallization device is provided at the end; Each concentration and crystallization device includes a humidification chamber (1) and a dehumidification chamber (24); The humidifying chamber (1) of the first concentrating crystallization device supplies water vapor with a first water content to the dehumidifying chamber (24) of the first concentrating crystallization device, and the water vapor with the first water content in the dehumidifying chamber (24) of the first concentrating crystallization device supplies water vapor to the dehumidifying chamber (24) of the subsequent concentrating crystallization device step by step, and is cooled step by step in each dehumidifying chamber (24), so that the water content of the water vapor gradually decreases; The dehumidification chamber (24) of the third concentrating crystallization device is the last stage dehumidification chamber (24), and the dehumidification chamber (24) of the third concentrating crystallization device supplies water vapor with the lowest water content to the humidification chamber (1) of the third concentrating crystallization device. The water vapor with the lowest water content in the humidification chamber (1) of the third concentrating crystallization device supplies water vapor to the humidification chamber (1) of the previous stage and the previous stage concentrating crystallization device step by step, and is heated in each stage humidification chamber (1), and the water content of the water vapor gradually increases. The humidification chamber (1) of the first concentrating crystallization device is the first stage humidification chamber (1).

2. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 1, characterized in that: The humidification chamber (1) comprises an upper shell, a sieve plate (12), a lower shell, a filler and a vibrator (1-9); the upper shell forms a first cavity inside, the lower shell forms a second cavity inside, and the sieve plate (12) separates the first cavity from the second cavity; The humidification chamber (1) includes a spraying member, which inputs the saline waste liquid in the first cavity through the circulating waste liquid inlet (2) of the upper shell, forms water vapor and saline droplets by spraying, and sprays the saline waste liquid toward the first cavity; Wherein: the filler is filled in the first cavity below the spray component, and the vibrator (1-9) is arranged in the first cavity filled with the filler.

3. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 2, characterized in that: The upper shell of the humidification chamber (1) is provided with a circulating waste liquid inlet (2) and a first humidification chamber water vapor outlet (57), and the lower shell is provided with a first humidification chamber air supply inlet (62) and a circulating waste liquid discharge outlet (15); The dehumidification chamber (24) comprises a shell and a cooling member, wherein a third cavity is formed inside the shell, wherein a first dehumidification chamber water vapor inlet (58) is provided at the upper portion of the shell, and a first dehumidification chamber water vapor outlet (59) and a water droplet discharge outlet (18) are provided at the lower portion of the shell; in: The upper shell of the humidification chamber (1) of the second concentrating and crystallizing device is further provided with a second humidification chamber water vapor outlet (63), and the upper portion of the shell of the dehumidification chamber (24) of the second concentrating and crystallizing device is further provided with a second dehumidification chamber water vapor inlet (65); The upper shell of the humidification chamber (1) of the third concentrating crystallization device is further provided with a second humidification chamber water vapor outlet (63), and the lower shell of the humidification chamber (1) is further provided with a second humidification chamber air supply inlet (64); The upper portion of the shell of the dehumidification chamber (24) of the third concentrating crystallization device is further provided with a second dehumidification chamber water vapor inlet (65), and the lower portion of the shell of the dehumidification chamber (24) is further provided with a second dehumidification chamber water vapor outlet (66); in: The circulating waste liquid inlet (2) of the upper shell of the humidifying bin (1) of the subsequent stage concentrating crystallization device is connected to the circulating waste liquid discharge outlet (15) of the lower shell of the humidifying bin (1) of the previous stage concentrating crystallization device, so that the salt-containing waste liquid discharged from the circulating waste liquid discharge outlet (15) of the humidifying bin (1) of the previous stage concentrating crystallization device passes into the circulating waste liquid inlet (2) of the humidifying bin (1) of the subsequent stage concentrating crystallization device to enter the first cavity of the upper shell of the humidifying bin (1) of the subsequent stage concentrating crystallization device; The connecting channel (60) of the first concentrating and crystallizing device is connected to the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) and the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24), so that water vapor is discharged from the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) to the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24), and then enters the third cavity of the shell of the dehumidifying chamber (24); The cooling water outlet (23) of the cooling member in the third cavity of the dehumidification bin (24) of the subsequent stage concentrating crystallization device is communicated with the cooling water inlet (21) of the cooling member in the third cavity of the dehumidification bin (24) of the previous stage concentrating crystallization device, so that the water outlet of the cooling water member in the third cavity of the dehumidification bin (24) of the subsequent stage concentrating crystallization device is passed into the cooling water inlet (21) of the cooling member in the third cavity of the dehumidification bin (24) of the previous stage concentrating crystallization device to enter the cooling member in the third cavity of the dehumidification bin (24) of the previous stage concentrating crystallization device, and is used to condense water vapor in the third cavity; The second dehumidification chamber water vapor inlet (65) on the upper portion of the shell of the dehumidification chamber (24) of the subsequent stage condensing and crystallizing device is communicated with the first dehumidification chamber water vapor outlet (59) on the lower portion of the shell of the dehumidification chamber (24) of the previous stage condensing and crystallizing device, so that the water vapor discharged from the first dehumidification chamber water vapor outlet (59) on the lower portion of the shell of the dehumidification chamber (24) of the previous stage condensing and crystallizing device passes into the second dehumidification chamber water vapor inlet (65) on the upper portion of the shell of the dehumidification chamber (24) of the subsequent stage condensing and crystallizing device, and enters the third cavity of the shell of the dehumidification chamber (24) of the subsequent stage condensing and crystallizing device, so that the water content of the water vapor is gradually reduced; The second dehumidification chamber water vapor outlet (66) at the lower portion of the shell of the dehumidification chamber (24) of the third condensing and crystallizing device is connected to the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1) via an air supply pipe (67), wherein an air blowing component is provided in the air supply pipe (67), and the air outlet of the air blowing component in the air supply pipe (67) faces the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1), so that the water vapor discharged from the second dehumidification chamber water vapor outlet (66) at the lower portion of the shell of the dehumidification chamber (24) of the third condensing and crystallizing device passes into the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1), enters the second cavity of the lower shell of the humidification chamber (1), and further passes into the first cavity of the upper shell of the humidification chamber (1); The second humidification chamber water vapor outlet (63) of the upper shell of the humidification chamber (1) of the subsequent stage condensing and crystallizing device is connected to the first humidification chamber air supply inlet (62) of the lower shell of the humidification chamber (1) of the previous stage condensing and crystallizing device, so that the water vapor discharged from the second humidification chamber water vapor outlet (63) of the upper shell of the humidification chamber (1) of the subsequent stage condensing and crystallizing device passes into the air supply inlet of the lower shell of the first humidification chamber of the humidification chamber (1) of the previous stage condensing and crystallizing device, enters the second cavity of the lower shell of the humidification chamber (1) of the previous stage condensing and crystallizing device, and further passes into the first cavity of the upper shell of the humidification chamber (1) of the previous stage condensing and crystallizing device, so that the water content of the water vapor gradually increases.

4. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 3, characterized in that: in: The upper shell of the second concentrating crystallization device is further provided with a first humidification chamber water vapor outlet (57), and the upper portion of the shell of the dehumidification chamber (24) is further provided with a first dehumidification chamber water vapor inlet (58); The lower shell of the humidification chamber (1) of the second concentrating crystallization device is further provided with a second humidification chamber air supply inlet (64), and the lower portion of the shell of the dehumidification chamber (24) is further provided with a second dehumidification chamber water vapor outlet (66); The connecting channel (60) of the second concentrating and crystallizing device is connected to the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) and the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24), so that water vapor is discharged from the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) to the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24), and then enters the third cavity of the shell of the dehumidifying chamber (24); The second dehumidification chamber water vapor outlet (66) at the lower part of the shell of the dehumidification chamber (24) of the second concentrating crystallization device is connected to the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1) through an air supply pipe (67). A blowing component is provided in the air supply pipe (67). The air outlet of the blowing component in the air supply pipe (67) faces the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1), so that the water vapor discharged from the second dehumidification chamber water vapor outlet (66) at the lower part of the shell of the dehumidification chamber (24) of the second concentrating crystallization device passes into the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1), enters the second cavity of the lower shell of the humidification chamber (1), and further passes into the first cavity of the upper shell of the humidification chamber (1).

5. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 4, characterized in that: in, The upper shell of the third concentrating crystallization device is further provided with a first humidification chamber water vapor outlet (57), and the upper portion of the shell of the dehumidification chamber (24) is further provided with a first dehumidification chamber water vapor inlet (58); The connecting channel (60) of the third concentrating and crystallizing device is connected to the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) and the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24), so that water vapor is discharged from the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) to the first dehumidifying chamber water vapor inlet (58) on the upper shell of the dehumidifying chamber (24) to enter the third cavity of the shell of the dehumidifying chamber (24).

6. The humidification and dehumidification series saline wastewater concentration and crystallization system according to any one of claims 3 to 5, characterized in that: It also includes a first heat exchanger, a circulation pool (29), a circulating waste liquid pump (27), and a second heat exchanger; The cooling water inlet (21) of the cooling member in the third cavity of the shell of the dehumidification bin (24) of the third concentrating crystallization device is connected to external cooling water, the cooling water outlet (23) of the cooling member in the third cavity of the shell of the dehumidification bin (24) of the first concentrating crystallization device is connected to the primary side of the first heat exchanger, and the output of the primary side of the first heat exchanger is connected to the external cooling water; The circulating waste liquid discharge outlet (15) of the lower shell of the dehumidification bin (24) of the third concentrating crystallization device is connected to the secondary side of the first heat exchanger, so that the circulating waste liquid discharged from the circulating waste liquid discharge outlet (15) of the lower shell of the dehumidification bin (24) of the third concentrating crystallization device is passed into the secondary side of the first heat exchanger, and the output of the secondary side of the first heat exchanger is connected to the circulating pool (29), and the exogenous salt-containing waste liquid is connected to the circulating pool (29) through a pipeline; The salt-containing waste liquid in the circulation pool (29) and the external salt-containing waste liquid are extracted by the circulating waste liquid pump (27) through a pipeline and output to the first side of the second heat exchanger. The first side of the second heat exchanger is connected to the circulating waste liquid inlet (2) of the upper shell of the humidification bin (1) of the first concentration and crystallization device. The second side of the second heat exchanger is the heat source medium flow side.

7. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 3, characterized in that: in, The cooling member cools the water vapor introduced into the third cavity through the water vapor inlet at the upper portion of the shell to form water droplets; The humidification chamber (1) also includes The auxiliary heater (7) comprises a plurality of groups of resistance wires radially and parallelly arranged in the humidification chamber (1); the resistance wires are bent along the dripping direction of the saline liquid droplets and arranged inside the humidification chamber (1); and gaps are provided between the groups of resistance wires to allow the saline liquid droplets to pass through.

8. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 2, characterized in that: The humidification chamber (1) further comprises a vibration fixing seat (1-8), the vibrator (1-9) is arranged on the vibration fixing seat (1-8), and the vibration fixing seat (1-8) is arranged on the inner wall of the upper shell; wherein at least two of the vibrators (1-9) are spaced apart and distributed in the first cavity filled with filler along the travel direction of the saline waste liquid in the first cavity; the vibrators (1-9) are arranged on the vibration fixing seat (1-8); and different vibration fixing seats (1-8) are spaced apart and distributed in the first cavity of the upper shell along the travel direction of the saline waste liquid in the first cavity, so that the different vibrators (1-9) are spaced apart and distributed in the first cavity of the upper shell along the travel direction of the saline waste liquid in the first cavity; Wherein, at least one through hole is provided on the vibration fixing seat (1-8).

9. The humidification and dehumidification series saline wastewater concentration and crystallization system according to claim 8, characterized in that: The vibration fixing seat (1-8) comprises a first vibration fixing seat and a second vibration fixing seat, wherein the fixed end portion of the first vibration fixing seat is arranged on the inner wall of the shell on the first side of the first cavity of the upper shell, and the fixed end portion of the second vibration fixing seat is arranged on the inner wall of the shell on the second side of the first cavity of the upper shell, and the first side and the second side are arranged opposite to each other, so that the vibrator arranged on the first vibration fixing seat is distributed on the first side of the first cavity of the upper shell, and the vibrator (1-9) arranged on the second vibration fixing seat is distributed on the second side of the first cavity of the upper shell; Two adjacent vibration fixing seats (1-8) are spaced apart and distributed at a certain distance above and below along the travel direction of the saline waste liquid in the first cavity, one of the vibration fixing seats (1-8) is a first vibration fixing seat, and the other vibration fixing seat (1-8) is a second vibration fixing seat, so that the vibrators (1-9) provided on the two adjacent vibration fixing seats (1-8) are arranged such that one of the vibrators (1-9) is distributed on a first side of the first cavity of the upper shell, and the other vibrator (1-9) is distributed on a second side of the first cavity of the upper shell; The front end portion of the vibration fixing seat (1-8) is arranged to extend beyond a central position between a first side and a second side opposite to the first cavity of the upper shell, and the front end portion of the vibration fixing seat (1-8) is an end portion opposite to a fixed end portion of the vibration fixing seat (1-8).

10. A crystallization method based on a humidification and dehumidification series saline waste liquid concentration and crystallization system according to claim 3, characterized in that: The steps include: The saline waste liquid is introduced into the upper shell through the circulating waste liquid inlet (2) of the humidifying bin (1) of the first concentrating and crystallizing device and sprayed by the spraying member to form water vapor and saline droplets. The saline droplets drip along the axial direction of the shell toward the second cavity of the lower shell, and the second cavity of the lower shell gathers the saline droplets. The water vapor of the first concentrating crystallization device is discharged from the first humidifying chamber water vapor outlet (57) of the upper shell of the humidifying chamber (1) and is passed into the first dehumidifying chamber water vapor inlet (58) on the upper part of the shell of the dehumidifying chamber (24), so as to enter the third cavity of the shell of the dehumidifying chamber (24); The salt-containing waste liquid discharged from the circulating waste liquid discharge outlet (15) of the humidifying bin (1) of the previous stage concentrating crystallization device is passed into the circulating waste liquid inlet (2) of the humidifying bin (1) of the next stage concentrating crystallization device, and then enters the first cavity of the upper shell of the humidifying bin (1) of the next stage concentrating crystallization device; Water from a cooling water outlet (23) of a cooling water component in the third cavity of a dehumidification bin (24) of a subsequent stage concentrating and crystallizing device is passed into a cooling water inlet (21) of a cooling component in the third cavity of a dehumidification bin (24) of a previous stage concentrating and crystallizing device, so as to enter the cooling component in the third cavity of the dehumidification bin (24) of the previous stage concentrating and crystallizing device, and is used to condense water vapor in the third cavity; The water vapor discharged from the first dehumidification chamber water vapor outlet (59) at the lower portion of the shell of the dehumidification chamber (24) of the previous stage condensing and crystallizing device is passed into the second dehumidification chamber water vapor inlet (65) at the upper portion of the shell of the dehumidification chamber (24) of the next stage condensing and crystallizing device, and then enters the third cavity of the shell of the dehumidification chamber (24) of the next stage condensing and crystallizing device; The water vapor discharged from the second dehumidification chamber water vapor outlet (66) at the lower portion of the shell of the dehumidification chamber (24) of the third condensing and crystallizing device is passed into the second humidification chamber air supply inlet (64) of the lower shell of the humidification chamber (1) of the third condensing and crystallizing device to enter the second cavity of the lower shell of the humidification chamber (1) and further pass into the first cavity of the upper shell of the humidification chamber (1); The water vapor discharged from the second humidification chamber water vapor outlet (63) of the upper shell of the humidification chamber (1) of the subsequent stage condensing and crystallizing device is passed into the air supply inlet of the lower shell of the first humidification chamber (1) of the humidification chamber (1) of the previous stage condensing and crystallizing device, so as to enter the second cavity of the lower shell of the humidification chamber (1) of the previous stage condensing and crystallizing device, and further pass into the first cavity of the upper shell of the humidification chamber (1) of the previous stage condensing and crystallizing device; After the system has been running for a period of time, the vibrator (1-9) in the first cavity of the upper shell of the humidification chamber (1) is started, and the vibration fixing seat (1-8) connected to the vibrator (1-9) vibrates the filler (4), so that crystals on the surface of the filler (4) and the shell wall fall off, and the crystals attached to the surface of the filler (4) fall off from the attached surface and fall from the holes of the vibration fixing seat (1-8) and fall into the second cavity of the lower shell of the humidification chamber (1). The crystals that fall off due to vibration gather in the concentrated liquid tank at the bottom of the second cavity of the lower shell of the humidification chamber (1), and the concentrated liquid tank contains concentrated liquid containing salt droplets. The concentrated liquid is in a supersaturated state, and the precipitated crystal substances are deposited in the concentrated liquid tank for removal.

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