A high-salt wastewater multi-effect evaporator

Abstract

The invention relates to the technical field of high-salt wastewater treatment, and specifically to a high-salt wastewater multi-effect evaporator, comprising a primary evaporator and a secondary evaporator, the primary evaporator having a primary hot air inlet and a primary hot air outlet, and a primary steam outlet, the secondary evaporator having a secondary hot air inlet and a secondary hot air outlet, and a secondary steam outlet, the primary hot air outlet and the primary steam outlet being connected to the secondary hot air inlet, the primary evaporator and the secondary evaporator having the same structure and both having an evaporation chamber, heat exchange concave platforms being arranged at equal intervals in a vertical direction in the evaporation chamber, a avoidance port being arranged at the center of the heat exchange concave platforms, and a water replenishment mechanism being further arranged on the primary evaporator and the secondary evaporator, the present invention provides heat exchange concave platforms arranged at equal intervals in a longitudinal direction in the evaporation chambers of the primary evaporator and the secondary evaporator, so that the effective evaporation areas in the primary evaporator and the secondary evaporator are increased, the evaporation efficiency is improved, and the wastewater treatment speed is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of high-salt wastewater treatment, and in particular to a high-salt wastewater multiple-effect evaporator. Background Art

[0002] High-salinity wastewater usually refers to wastewater containing high concentrations of salt, such as desalination wastewater, chemical industrial wastewater, etc. Since high-salinity wastewater has serious pollution and potential harm to the environment, treating high-salinity wastewater has become an important task. Traditional treatment methods include chemical precipitation, ion exchange, membrane separation, etc., but these methods have some problems, such as high treatment cost, large amount of waste, and high equipment requirements.

[0003] Multi-effect evaporation is an efficient and energy-saving wastewater treatment technology that can effectively treat high-salt wastewater. The multi-effect evaporator evaporates the wastewater multiple times under different pressure conditions, using the evaporator effect and waste heat recovery to evaporate water from the wastewater to achieve the purpose of concentration and separation. This technology can not only recycle water and reduce wastewater discharge, but also separate valuable substances such as salts from the wastewater, and has the advantages of high efficiency, energy saving, and no chemical agent addition.

[0004] Traditional multi-effect evaporators usually use a single effect, that is, multiple evaporations are performed through a single evaporator, and the heat generated by each evaporation can only be supplied to the next evaporator. Due to the step-by-step loss of heat, traditional multi-effect evaporators have the problem of low energy utilization.

[0005] Chinese patent authorization announcement number CN116692983B discloses a high-salt wastewater multi-effect evaporator, including a support frame, a primary evaporation tank is installed on the left side of the upper end surface of the support frame, a steam pipe is installed on the upper end of the primary evaporation tank, and the end of the steam pipe is connected to its secondary evaporation tank, a heating cabin is installed inside the secondary evaporation tank, a stirring assembly for stirring high-salt wastewater is installed inside the heating cabin, a forward and reverse mechanism for controlling the stirring direction of the stirring assembly is installed on the upper end surface of the heating cabin, a collecting mechanism for collecting high-salt wastewater dirt after cleaning is installed at the bottom of the heating cabin, and a filtering assembly for filtering high-salt wastewater is installed at the center of the collecting mechanism.

[0006] The radial areas of the primary evaporation tank and the secondary evaporation tank of the multiple-effect evaporator are limited, so the effective evaporation area of ​​the high-salinity wastewater is limited, which in turn leads to a low evaporation efficiency of the high-salinity wastewater. Summary of the invention

[0007] In view of the above problems, a high-salt wastewater multiple-effect evaporator is provided, in which heat exchange concave tables arranged at equal intervals in the longitudinal direction are arranged in the evaporation chambers of the primary evaporation tank and the secondary evaporation tank, and high-salt wastewater is added to the heat exchange concave tables through a water replenishing mechanism. The high-salt wastewater is evaporated on the heat exchange concave tables, and the effective evaporation area in the primary evaporation tank and the secondary evaporation tank is increased, thereby solving the problem of limited effective evaporation area of ​​the existing multiple-effect evaporator.

[0008] In order to solve the problems of the prior art, the present invention provides a high-salt wastewater multi-effect evaporator, comprising a primary evaporation tank and a secondary evaporation tank, the primary evaporation tank having a primary hot air inlet and a primary hot air outlet for heat exchange, and a primary steam outlet for generating steam after heating the high-salt wastewater and capable of being discharged outwardly, the secondary evaporation tank having a secondary hot air inlet and a secondary hot air outlet for heat exchange, and a secondary steam outlet for generating steam after heating the high-salt wastewater and capable of being discharged outwardly, the primary hot air outlet and the primary steam outlet are connected to the secondary hot air inlet, the primary evaporation tank and the secondary evaporation tank have the same structure and both have evaporation chambers, heat exchange concave platforms for holding high-salt wastewater are arranged at equal intervals in the vertical direction in the evaporation chamber, a avoidance port is arranged at the center of the heat exchange concave platforms, and a water replenishment mechanism for replenishing high-salt wastewater to the heat exchange concave platforms is also arranged on the primary evaporation tank and the secondary evaporation tank.

[0009] Preferably, the evaporation chamber is also provided with a scraping mechanism for scraping off the salt scale on the heat exchange concave platform and pushing the salt scale into the avoidance port. After passing through the avoidance port, the salt scale falls on the bottom of the evaporation chamber. The bottom of the evaporation chamber is provided with a scale discharge port for discharging the salt scale outward.

[0010] Preferably, the primary steam outlet is located at the top of the primary evaporation tank, and a rotating fan blade that can rotate is also provided on the top of the evaporation chamber. When the rotating fan blade rotates, the steam generated by the evaporation of high-salt wastewater on the heat exchange concave table flows upward and is discharged through the primary steam outlet.

[0011] Preferably, heat exchange tubes are evenly distributed at the bottom of the heat exchange concave platform, and both ends of the heat exchange tubes are respectively connected to the first-level hot air inlet and the first-level hot air outlet, and the hot air heats the heat exchange concave platform when passing through the heat exchange tubes.

[0012] Preferably, the heat exchange recess includes a conical cylinder, the diameter of which gradually decreases from bottom to top, the outer edge of the conical cylinder is coaxially fixedly connected to the inner wall of the evaporation chamber, the inner edge of the conical cylinder forms an escape port for steam and salt scale to pass through, a groove for holding high-salt wastewater is formed between the outer cone surface of the conical cylinder and the inner wall of the steam chamber, and the heat exchange tube is coaxially wound on the inner circumferential surface of the conical cylinder.

[0013] Preferably, the scraping mechanism includes a driving motor, a rotating shaft and a scraping frame, the driving motor is arranged at the top of the first-stage evaporation tank; the rotating shaft is coaxially rotatably arranged in the evaporation chamber, and the top of the rotating shaft is synchronously connected with the output shaft of the driving motor; the scraping frame is coaxially and equidistantly arranged on the rotating shaft, and the bottom end of the scraping frame is provided with a spiral blade coaxial therewith, and the spiral blade coaxially abuts against the outer circumferential surface of the conical cylinder. When the scraping frame rotates relative to the conical cylinder, the spiral blade rotates and scrapes off the salt scale on the outer circumferential surface of the conical cylinder.

[0014] Preferably, the scraper frame includes an inner ring, an outer ring and a connecting rod, the inner ring is coaxially arranged on the rotating shaft; the outer ring is coaxially rotatably arranged at the outer top end of the conical cylinder; the two ends of the connecting rod are fixedly connected to the outer ring and the inner ring respectively, the bottom end of the connecting rod is parallel to the outer cone surface of the conical cylinder and forms an installation gap, and the spiral blade is coaxially arranged at the bottom end of the connecting rod with the inner ring; a scraper rod is arranged at the top end of the outer ring, the scraper rod extends upward in the longitudinal direction, and the scraper rod abuts against the inner wall of the evaporator along the radial direction of the rotating shaft.

[0015] Preferably, the inner ring is coaxially slidably arranged on the rotating shaft, a limiting ring is also arranged on the rotating shaft at the top of the inner ring, an elastic member is arranged between the limiting ring and the inner ring, and the spiral blades elastically abut against the outer circumferential surface of the conical cylinder.

[0016] Preferably, a drainage tube coaxial with the rotating shaft is provided at the top of the connecting rod, the diameter of the drainage tube gradually increases from bottom to top, the top opening of the drainage tube is lower than the avoidance port at its top, and the bottom opening diameter of the drainage tube is not less than the diameter of the avoidance port.

[0017] Preferably, the first-stage evaporator is also provided with a shunt pipe and a connecting pipe extending in the horizontal direction, and the shunt pipe and the connecting pipe are both connected to the heat exchange recess, and a liquid measuring tube extending in the longitudinal direction is provided at the outer end of the connecting pipe, and the water replenishment mechanism includes a water replenishment pipe, a solenoid valve and a liquid level sensor, and the water replenishment pipe is connected to high-salt wastewater, and the water replenishment pipe is provided with water supply pipes arranged at equal intervals along its length direction, the solenoid valve is arranged to connect the shunt pipe and the water supply pipe, and the probe of the liquid level sensor is arranged in the liquid measuring tube along the longitudinal direction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present application provides heat exchange concave tables arranged at equal intervals in the longitudinal direction in the evaporation chambers of the primary evaporator and the secondary evaporator, and replenishes high-salt wastewater to the heat exchange concave tables through a water replenishment mechanism. The high-salt wastewater is evaporated on the heat exchange concave tables, and the effective evaporation area in the primary evaporator and the secondary evaporator is increased, the evaporation efficiency is improved, and the wastewater treatment speed is accelerated, thereby improving the efficiency of the entire wastewater treatment system, and solving the problem of limited effective evaporation area of ​​the existing multiple-effect evaporator.

[0020] 2. The present application provides a scraping mechanism in the evaporation chamber that can scrape off the salt scale in the heat exchange concave table, so that the scraping mechanism can push the salt scale on the heat exchange concave table to the avoidance port, so that the salt scale falls to the bottom of the evaporation chamber under the action of gravity, thereby discharging the salt scale from the evaporation chamber through the discharge port at the bottom of the evaporation chamber, so that too much salt scale accumulates in the evaporation chamber and high-salt wastewater cannot be evaporated, while ensuring and stabilizing the heat exchange efficiency of the heat exchange concave table, thereby stabilizing the evaporation efficiency of the high-salt wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereoscopic image of a high-salinity wastewater multiple-effect evaporator from the first perspective.

[0022] Figure 2 It is a three-dimensional cross-sectional view of a high-salinity wastewater multiple-effect evaporator.

[0023] Figure 3 It is a cross-sectional view of a high-salinity wastewater multiple-effect evaporator.

[0024] Figure 4 yes Figure 3 A partial enlarged view of point A.

[0025] Figure 5 yes Figure 3 A partial enlarged view of point B.

[0026] Figure 6 It is a stereoscopic image of a high-salinity wastewater multiple-effect evaporator from a second viewing angle.

[0027] Figure 7 It is a structural schematic diagram of the first-stage evaporation tank in a high-salt wastewater multi-effect evaporator.

[0028] Figure 8 It is a stereoscopic diagram of the heat exchange concave table and scraper rack in a high-salinity wastewater multiple-effect evaporator.

[0029] Fig. 9 It is a three-dimensional exploded view of the heat exchange concave table and scraper frame in a high-salinity wastewater multi-effect evaporator.

[0030] The numbers in the figure are: 1. primary evaporator; 11. primary hot air inlet; 12. primary hot air outlet; 13. primary steam outlet; 14. shunt pipe; 15. connecting pipe; 151. liquid measuring pipe; 16. scale outlet; 2. secondary evaporator; 21. secondary hot air inlet; 22. secondary hot air outlet; 23. secondary steam outlet; 3. heat exchange concave platform; 31. avoidance port; 32. heat exchange tube; 33. conical cylinder; 4. water replenishment mechanism; 41. water replenishment pipe; 42. solenoid valve; 43. liquid level sensor; 5. scraping mechanism; 51. driving motor; 52. rotating shaft; 531. spiral blade; 532. inner ring; 533. outer ring; 534. connecting rod; 535. drainage tube; 536. scraping rod; 54. limiting ring; 55. elastic member; 56. corrugated sleeve; 6. rotating fan blade; 7. planetary reducer. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides:

[0033] A high-salinity wastewater multi-effect evaporator comprises a primary evaporation tank 1 and a secondary evaporation tank 2, wherein the primary evaporation tank 1 has a primary hot air inlet 11 and a primary hot air outlet 12 for heat exchange, and a primary steam outlet 13 for generating steam after heating the high-salinity wastewater and capable of being discharged outward, the secondary evaporation tank 2 has a secondary hot air inlet 21 and a secondary hot air outlet 22 for heat exchange, and a secondary steam outlet 23 for generating steam after heating the high-salinity wastewater and capable of being discharged outward, the primary hot air outlet 12 and the primary steam outlet 13 are connected to the secondary hot air inlet 21, the primary evaporation tank 1 and the secondary evaporation tank 2 have the same structure and both have evaporation chambers, heat exchange concave platforms 3 for containing high-salinity wastewater are arranged at equal intervals in the vertical direction in the evaporation chamber, a avoidance port 31 is arranged at the center of the heat exchange concave platform 3, and a water replenishment mechanism 4 for replenishing the heat exchange concave platform 3 with high-salinity wastewater is also arranged on the primary evaporation tank 1 and the secondary evaporation tank 2.

[0034] When in use, high-salt wastewater can be added to the heat exchange concave platform 3 of the primary evaporation tank 1 and the secondary evaporation tank 2 through the water replenishment mechanism 4, so as to increase the effective evaporation area of ​​the high-salt wastewater in the primary evaporation tank 1 and the secondary evaporation tank 2.

[0035] After being heated, the air is pumped into the primary hot air inlet 11 and the secondary hot air inlet 21 through a blower, so that the hot air heats the heat exchange concave table 3 in the evaporation chambers of the primary evaporation tank 1 and the secondary evaporation tank 2, so that the high-salt wastewater in the heat exchange concave table 3 is evaporated and steam is generated. The steam in the primary evaporation tank 1 is discharged through the primary steam outlet 13, and the steam in the secondary evaporation tank 2 is discharged through the secondary steam outlet 23. The secondary steam outlet 23 can be connected to a condenser to condense and liquefy the steam discharged from the secondary steam outlet 23. The temperature of the steam discharged from the primary steam outlet 13 is relatively high, so it is connected to the secondary hot air inlet 21, so that the hot air in the primary evaporation tank 1 is used to heat the heat exchange concave table 3 in the secondary evaporation tank 2, so as to reuse the heat and reduce energy loss.

[0036] Since the avoidance opening 31 is provided at the center of the heat exchange concave platform 3, the steam generated by evaporation on the lower heat exchange concave platform 3 can flow upward through the avoidance opening 31, thereby preventing the steam from accumulating in the evaporation chamber and causing the pressure of the evaporation chamber to increase.

[0037] In this embodiment, heat exchange concave tables 3 arranged at equal intervals in the longitudinal direction are arranged in the evaporation chambers of the primary evaporation tank 1 and the secondary evaporation tank 2, and high-salt wastewater is added to the heat exchange concave tables 3 through the water replenishment mechanism 4. The high-salt wastewater is evaporated on the heat exchange concave tables 3, and the effective evaporation area in the primary evaporation tank 1 and the secondary evaporation tank 2 is increased, the evaporation efficiency is improved, and the wastewater treatment speed is accelerated, thereby improving the efficiency of the entire wastewater treatment system, and solving the problem of limited effective evaporation area of ​​the existing multiple-effect evaporator.

[0038] like Figure 3 and Figure 4 As shown, the evaporation chamber is also provided with a scraping mechanism 5 for scraping off the salt scale on the heat exchange concave platform 3 and pushing the salt scale into the avoidance port 31. The salt scale falls on the bottom of the evaporation chamber after passing through the avoidance port 31. The bottom of the evaporation chamber is provided with a scale discharge port 16 for discharging the salt scale to the outside.

[0039] After evaporation, high-salt wastewater will produce a large amount of salt scale, which will accumulate in the grooves of the heat exchange concave platform 3 and affect the heat exchange efficiency of the heat exchange concave platform 3, thereby affecting the evaporation efficiency of the high-salt wastewater on the heat exchange concave platform 3.

[0040] By arranging a scraping mechanism 5 in the evaporation chamber that can scrape off the salt scale in the heat exchange concave table 3, the scraping mechanism 5 can push the salt scale on the heat exchange concave table 3 to the avoidance port 31, so that the salt scale falls to the bottom of the evaporation chamber under the action of gravity, and the salt scale is discharged from the evaporation chamber through the scale discharge port 16 at the bottom of the evaporation chamber, so that too much salt scale accumulates in the evaporation chamber and high-salt wastewater cannot be evaporated, while ensuring and stabilizing the heat exchange efficiency of the heat exchange concave table 3, thereby stabilizing the evaporation efficiency of the high-salt wastewater.

[0041] like Figure 3 and Figure 7 As shown, the primary steam outlet 13 is located at the top of the primary evaporation tank 1, and a rotatable fan blade 6 is also provided on the top of the evaporation chamber. When the rotary fan blade 6 rotates, the steam generated by the evaporation of the high-salt wastewater on the heat exchange concave table 3 flows upward and is discharged through the primary steam outlet 13.

[0042] In order to enable the steam in the lower part of the evaporation chamber to quickly pass through the avoidance port 31 and be discharged outwardly through the primary steam outlet 13, thereby improving the evaporation efficiency, a rotatable rotating blade 6 is installed on the top of the evaporation chamber. The rotating blade 6 can guide the air at its bottom to flow upward quickly during high-speed rotation, so that the pressure at the bottom of the rotating blade 6 is lower than the pressure at the top of the rotating blade 6, thereby enabling the steam in the lower part of the evaporation chamber to flow upward quickly and be discharged outwardly through the primary steam outlet 13, thereby improving the evaporation efficiency of the primary evaporator 1.

[0043] like Figure 4 As shown, heat exchange tubes 32 are evenly distributed at the bottom of the heat exchange concave platform 3. Both ends of the heat exchange tubes 32 are respectively connected to the first-level hot air inlet 11 and the first-level hot air outlet 12. The hot air heats the heat exchange concave platform 3 when passing through the heat exchange tubes 32.

[0044] In order to ensure that the heat exchange concave table 3 can be heated evenly, the heat exchange tube 32 is wound around the bottom of the heat exchange concave table 3 so that the heat exchange tube 32 is not in direct contact with the high-salt wastewater, thereby preventing salt scale from accumulating on the outer peripheral surface of the heat exchange tube 32. The heat exchange tube 32 heats the heat exchange concave table 3 and then heats the high-salt wastewater. The indirect heating method can effectively prevent salt scale from accumulating on the heat exchange tube 32, thereby improving the efficiency of removing salt scale.

[0045] like Figure 4 As shown, the heat exchange concave platform 3 includes a conical cylinder 33, the diameter of which gradually decreases from bottom to top, the outer edge of the conical cylinder 33 is coaxially fixedly connected to the inner wall of the evaporation chamber, the inner edge of the conical cylinder 33 forms an escape port 31 for steam and salt scale to pass through, a groove for containing high-salt wastewater is formed between the outer conical surface of the conical cylinder 33 and the inner wall of the steam chamber, and the heat exchange tube 32 is coaxially wound on the inner circumferential surface of the conical cylinder 33.

[0046] In order to facilitate the discharge of salt scale on the heat exchange concave platform 3, the heat exchange concave platform 3 is in the shape of a conical cylinder 33, so that the outer circumferential surface of the conical cylinder 33 and the inner wall of the evaporator form a groove of the heat exchange concave platform 3, and high-salt wastewater can be gathered in the groove of the heat exchange platform. Salt scale generally gathers on the outer circumferential surface of the conical cylinder 33. At the same time, the scraping mechanism 5 can scrape off the salt scale on the outer circumferential surface of the conical cylinder 33 and push the salt scale toward the top opening of the conical cylinder 33, so that the salt scale can fall on the bottom of the evaporation chamber through the top opening of the conical cylinder 33, so that the salt scale can be scraped off while evaporating.

[0047] like Figure 3As shown, the scraping mechanism 5 includes a driving motor 51, a rotating shaft 52 and a scraping frame. The driving motor 51 is arranged at the top of the primary evaporation tank 1; the rotating shaft 52 is coaxially rotatably arranged in the evaporation chamber, and the top of the rotating shaft 52 is synchronously connected with the output shaft of the driving motor 51; the scraping frame is coaxially and equidistantly arranged on the rotating shaft 52, and the bottom end of the scraping frame is provided with a coaxial spiral blade 531, which is coaxially abutted against the outer circumferential surface of the conical cylinder 33. When the scraping frame rotates relative to the conical cylinder 33, the spiral blade 531 rotates and scrapes off the salt scale on the outer circumferential surface of the conical cylinder 33.

[0048] A planetary reducer 7 is also provided on the top of the evaporation chamber. The output shaft of the drive motor 51 is coaxially connected to the input shaft of the planetary reducer 7. The output shaft of the planetary reducer 7 is coaxially fixedly connected to the top of the rotating shaft 52. The rotating fan blades 6 are coaxially arranged on the input shaft of the planetary reducer 7, so that the rotation speed of the rotating fan blades 6 is much greater than the rotation speed of the rotating shaft 52, thereby avoiding the rotation speed of the rotating shaft 52 being too high and causing the rotation speed of the scraper frame to be too high, thereby avoiding the top of the conical cylinder 33 being scratched by the high-speed rotating spiral blades 531.

[0049] When the driving motor 51 is started, the driving motor 51 can drive the rotating blades to rotate at a high speed, so that the rotating rotating blades can guide the steam in the evaporation chamber to be quickly discharged outward through the primary steam outlet 13 .

[0050] After the planetary reducer 7 is input with torque, it drives the rotating shaft 52 to rotate, so that the rotating shaft 52 can drive the scraper frame to rotate at the top of the conical cylinder 33, and then the spiral blade 531 can rotate at the top of the conical cylinder 33. The spiral blade 531 is in contact with the conical cylinder 33, so that the rotating blade can scrape off the salt scale on the top of the conical cylinder 33 while rotating. At the same time, because the spiral blade 531 rotates relative to the conical cylinder 33, the salt scale can be sent to the top opening of the conical cylinder 33 by the rotating spiral blade 531 until the salt scale is pushed to the top opening of the conical cylinder 33 and falls to the bottom of the evaporation chamber through the opening.

[0051] like Figure 8 and Fig. 9 As shown, the scraper frame includes an inner ring 532, an outer ring 533 and a connecting rod 534. The inner ring 532 is coaxially arranged on the rotating shaft 52; the outer ring 533 is coaxially rotatably arranged at the outer top of the conical cylinder 33; the two ends of the connecting rod 534 are fixedly connected to the outer ring 533 and the inner ring 532 respectively, the bottom end of the connecting rod 534 is parallel to the outer cone surface of the conical cylinder 33 and forms an installation gap, and the spiral blade 531 is coaxially arranged with the inner ring 532 at the bottom end of the connecting rod 534; a scraper rod 536 is arranged at the top of the outer ring 533, and the scraper rod extends upward in the longitudinal direction, and the scraper rod abuts against the inner wall of the evaporation tank along the radial direction of the rotating shaft 52.

[0052] The inner ring 532, the outer ring 533 and the connecting rod 534 can form a structure for installing the spiral blade 531. At the same time, because the connecting rod 534 is slightly higher than the outer circumference of the conical cylinder 33, there is a certain space between the connecting rod 534 and the outer circumference of the spiral cylinder. The spiral blade 531 is installed at the bottom end of the connecting rod 534, so that the spiral blade 531 can scrape off the salt scale while the rotating spiral blade 531 can push the salt scale toward the top opening of the conical cylinder 33.

[0053] The scraper rod rotating in the circumferential direction of the rotating shaft 52 can scrape off the salt scale on the inner wall of the evaporation chamber, thereby preventing the salt scale on the inner wall of the evaporation chamber from accumulating and affecting the rotation of the outer ring 533 .

[0054] like Figure 5 and Figure 8 As shown, the inner ring 532 is coaxially slidably arranged on the rotating shaft 52, and a limiting ring 54 located at the top of the inner ring 532 is also arranged on the rotating shaft 52. An elastic member 55 is arranged between the limiting ring 54 and the inner ring 532, and the spiral blade 531 elastically abuts against the outer circumferential surface of the conical cylinder 33.

[0055] A corrugated sleeve 56 is provided between the limiting ring 54 and the inner ring 532. The top end of the corrugated sleeve 56 is connected to the limiting ring 54, and the bottom end of the shifting platform is fixedly connected to the inner ring 532 to prevent the elastic member 55 from being corroded by high-temperature steam and improve the stability of the structure.

[0056] The inner ring 532 is coaxially slidably disposed on the rotating shaft 52 , similar to the connection between a spline shaft and a spline sleeve. The rotating shaft 52 can input torque to the inner ring 532 while the inner ring 532 can slide up and down relative to the rotating shaft 52 .

[0057] The limiting ring 54 can make the elastic member 55 elastically abut against the top end of the inner ring 532, and then the spiral blade 531 installed at the bottom of the connecting rod 534 can elastically abut against the outer circumferential surface of the conical cylinder 33, thereby preventing the spiral blade 531 from directly rigidly abutting against the conical cylinder 33, avoiding rigid contact and causing rigid vibration when scraping off salt scale, and improving the stability of the structure through elastic contact.

[0058] like Figure 3 As shown, a drainage tube 535 coaxial with the rotating shaft 52 is provided at the top of the connecting rod 534, and the diameter of the drainage tube 535 gradually increases from bottom to top. The top opening of the drainage tube 535 is lower than the avoidance port 31 at its top, and the bottom opening diameter of the drainage tube 535 is not less than the diameter of the avoidance port 31.

[0059] By arranging the drainage cylinder 535 and the rotating shaft 52 coaxially on the connecting rod 534, the diameter of the drainage cylinder 535 gradually increases from bottom to top, so that the salt scale discharged from the conical cylinder 33 at the upper end position can fall into the drainage cylinder 535 at the lower end position, avoiding the salt scale from falling on the conical cylinder 33 at the lower end position. At the same time, the drainage cylinder 535 can guide the salt scale cylinder to fall downward from the top end opening of the conical cylinder 33, thereby improving the scraping efficiency of the salt scale without affecting the flow efficiency of the steam.

[0060] like Figure 6 As shown, the primary evaporator is also provided with a shunt pipe 14 and a connecting pipe 15 extending in the horizontal direction. Both the shunt pipe 14 and the connecting pipe 15 are connected to the heat exchange concave platform 3. The outer end of the connecting pipe 15 is provided with a liquid measuring tube 151 extending in the longitudinal direction. The water replenishment mechanism 4 includes a water replenishment pipe 41, a solenoid valve 42 and a liquid level sensor 43. The water replenishment pipe 41 is connected to high-salt wastewater. The water replenishment pipe 41 is provided with water supply pipes arranged at equal intervals along its length direction. The solenoid valve 42 is arranged to connect the shunt pipe 14 and the water supply pipe. The probe of the liquid level sensor 43 is arranged in the liquid measuring tube 151 along the longitudinal direction.

[0061] Because the liquid measuring tube 151 is connected with the high-salt wastewater in the heat exchange concave table 3 through the connecting tube 15, through the principle of the communicating vessel, the liquid level in the liquid measuring tube 151 is level with the liquid level in the heat exchange concave table 3, and the probe of the liquid level sensor 43 is installed in the liquid measuring tube 151. When the liquid level in the heat exchange concave table 3 drops, the liquid level sensor 43 can detect the liquid level in the liquid measuring tube 151, and then send a signal to the main controller, which controls the corresponding solenoid valve 42 to open, so that the solenoid valve 42 connects the corresponding shunt pipe 14 and the water supply pipe until the liquid level in the heat exchange concave table 3 reaches a preset height, and then the solenoid valve 42 is closed to stop the water supply, so as to ensure that the high-salt wastewater in each heat exchange concave table 3 can maintain an appropriate liquid level, improve the evaporation efficiency, and avoid the lack of high-salt wastewater in the heat exchange concave table 3.

[0062] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A high-salinity wastewater multiple-effect evaporator, comprising a primary evaporation tank and a secondary evaporation tank, characterized in that: The first-stage evaporator has a first-stage hot air inlet and a first-stage hot air outlet for heat exchange, and a first-stage steam outlet for generating steam after heating the high-salt wastewater and capable of being discharged outwardly. The second-stage evaporator has a second-stage hot air inlet and a second-stage hot air outlet for heat exchange, and a second-stage steam outlet for generating steam after heating the high-salt wastewater and capable of being discharged outwardly. The first-stage hot air outlet and the first-stage steam outlet are connected with the second-stage hot air inlet. The first-stage evaporator and the second-stage evaporator have the same structure and both have evaporation chambers. Heat exchange concave platforms for holding high-salt wastewater are arranged at equal intervals in the vertical direction in the evaporation chamber, and an avoidance port is arranged at the center of the heat exchange concave platform. The first-stage evaporator and the second-stage evaporator are also provided with a water replenishment mechanism for replenishing high-salt wastewater to the heat exchange concave platform; the evaporation chamber is also provided with a scraping mechanism for scraping off salt scale on the heat exchange concave platform and pushing the salt scale into the avoidance port. The salt scale falls on the bottom of the evaporation chamber after passing through the avoidance port. The bottom is provided with a scale discharge port for discharging salt scale outward; the first-level steam outlet is located at the top of the first-level evaporation tank, and the top of the evaporation chamber is also provided with a rotating fan blade that can rotate. When the rotating fan blade rotates, the steam generated by the evaporation of high-salt wastewater on the heat exchange concave platform flows upward and is discharged through the first-level steam outlet; the bottom of the heat exchange concave platform is evenly distributed with heat exchange tubes, and the two ends of the heat exchange tubes are respectively connected to the first-level hot air inlet and the first-level hot air outlet, and the hot air heats the heat exchange concave platform during passing through the heat exchange tubes; the heat exchange concave platform includes a conical cylinder, the diameter of the conical cylinder gradually decreases from bottom to top, the outer edge of the conical cylinder is coaxially fixedly connected with the inner wall of the evaporation chamber, the inner edge of the conical cylinder forms an avoidance port for steam and salt scale to pass through, and a groove for holding high-salt wastewater is formed between the outer cone surface of the conical cylinder and the inner wall of the steam chamber, and the heat exchange tube is coaxially wound on the inner circumferential surface of the conical cylinder; the scraping mechanism includes a driving motor, a rotating shaft and a scraping rack. The driving motor is arranged at the top of the first-stage evaporation tank; The rotating shaft is coaxially rotatably arranged in the evaporation chamber, and the top end of the rotating shaft is synchronously connected with the output shaft of the driving motor; The scraper frame is coaxially arranged on the rotating shaft at equal intervals. The bottom end of the scraper frame is provided with a coaxial spiral blade, which abuts against the outer circumference of the conical cylinder coaxially. When the scraper frame rotates relative to the conical cylinder, the spiral blade rotates and scrapes off the salt scale on the outer circumference of the conical cylinder. The scraper frame includes an inner ring, an outer ring and a connecting rod. The inner ring is coaxially arranged on the rotating shaft; The outer ring is coaxially rotatably arranged on the outer top end of the conical cylinder; The two ends of the connecting rod are fixedly connected to the outer ring and the inner ring respectively, the bottom end of the connecting rod is parallel to the outer cone surface of the conical cylinder and forms an installation gap, and the spiral blade is coaxially arranged with the inner ring at the bottom end of the connecting rod; A scraper rod is arranged at the top of the outer ring, the scraper rod extends upward in the longitudinal direction, and abuts against the inner wall of the evaporator along the radial direction of the rotating shaft; the inner ring is coaxially slidably arranged on the rotating shaft, and a limiting ring located at the top of the inner ring is also arranged on the rotating shaft, an elastic member is arranged between the limiting ring and the inner ring, and the spiral blade elastically abuts against the outer circumferential surface of the conical cylinder.

2. A high-salt wastewater multiple-effect evaporator according to claim 1, characterized in that: A drainage tube coaxial with the rotating shaft is arranged at the top of the connecting rod, the diameter of the drainage tube gradually increases from bottom to top, the top opening of the drainage tube is lower than the avoidance opening at its top, and the bottom opening diameter of the drainage tube is not less than the diameter of the avoidance opening.

3. A high-salt wastewater multiple-effect evaporator according to claim 1, characterized in that: The first-stage evaporator is also provided with a shunt pipe and a connecting pipe extending in the horizontal direction. Both the shunt pipe and the connecting pipe are connected to the heat exchange concave platform. The outer end of the connecting pipe is provided with a liquid measuring tube extending in the longitudinal direction. The water replenishment mechanism includes a water replenishment pipe, a solenoid valve and a liquid level sensor. The water replenishment pipe is connected to high-salt wastewater. The water replenishment pipe is provided with water supply pipes arranged at equal intervals along its length direction. The solenoid valve is arranged to connect the shunt pipe and the water supply pipe, and the probe of the liquid level sensor is arranged in the liquid measuring tube along the longitudinal direction.

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