Novel boiler continuous drainage self-heating desalting system
Through a new boiler continuous drainage self-heating desalination system combining low temperature multi-effect and multi-stage flash evaporation technology, the problem of low energy utilization in boiler drainage treatment is solved, and efficient recycling and utilization of fixed discharge and continuous heat of power plants is achieved. Reduce heat source losses and improve energy utilization.
Patent Information
- Application Number
- CN202411328689.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2024-12-13
AI Technical Summary
The energy utilization rate of the existing boiler drainage treatment methods is not high, and the heat from the power plant is not effectively utilized, resulting in serious heat loss.
Adopt a new boiler water drainage self-heating desalination system, combining low-temperature multi-effect and multi-stage flash evaporation technology, and use the power plant's fixed-discharge and continuous discharge heat to recover heat through multi-effect evaporators and flash evaporators, and use fixed-discharge and continuous discharge. The wastewater is drained for multiple uses, and the energy-saving finished water is finally output.
It improves energy utilization, reduces heat source losses, achieves efficient and reasonable utilization of drainage, and desalinates wastewater and recycles it.
Smart Images
Figure CN119123403A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of water treatment and heat recovery, and in particular relates to a novel boiler-water self-heating desalination system. Background Art
[0002] Boiler drainage includes continuous discharge and scheduled discharge. Existing treatment methods include directly using it for workshop or unit water use, or using its hot water or steam for heat exchange, etc. These methods are relatively simple and direct, and do not fully consider the specific properties of continuous and scheduled discharge sewage. The utilization rate of heat and water resources is not high, and the best energy recovery and utilization effect cannot be achieved. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a new type of boiler continuous discharge self-heating desalination system to solve the problem of low energy utilization rate of existing solutions, realize the utilization of fixed discharge and continuous discharge heat of power plants, reduce heat source loss, and desalinate and recycle wastewater for further utilization.
[0004] According to the technical solution of the present invention, the present invention provides a novel boiler-water self-heating desalination system, including a heating evaporation and water supply system, a brine discharge and cooling circulation system, a finished water discharge system, a cold air system, and a vacuum system; The heating evaporation and water supply system comprises a row expansion tank, a flash tank, an evaporator and an air condenser connected in sequence, wherein the evaporator is a multiple-effect evaporator, the steam output end of the flash tank is connected to the steam input end of the first-effect evaporator of the evaporator, and the drainage end of the flash tank is connected to the spray water device of the first-effect evaporator of the evaporator; and also comprises a fixed-row expansion tank, which is connected to the spray water device of the second-effect evaporator of the evaporator through a fixed-row hot water pipeline; The brine discharge and cooling circulation system includes a brine transfer pipeline. The brine discharge end of the last effect evaporator of the evaporator is connected to the exhaust side of the air-cooled condenser through the brine transfer pipeline, and a brine transfer pump is provided in the brine transfer pipeline; the bottom of the exhaust side of the air-cooled condenser is connected to the cooling water pool of the air-cooled condenser; the cooling water pool is connected to the spray water device of the air-cooled condenser through a cooling circulation pipeline, a cooling circulation water pump is provided on the cooling circulation pipeline, and a concentrated brine discharge pipeline is also connected to the cooling circulation pipeline; The finished water discharge system includes a finished water pipeline, the drainage end of the condensate pipeline of the air-cooled condenser is connected to the finished water pipeline, and a finished water pump is provided on the finished water pipeline; The cold air system includes a cold air blower, the cold air output end of the cold air blower is connected to a side air supply pipeline and a lower air supply pipeline, the side air supply pipeline is connected to the side of the air-cooled condenser, and the lower air supply pipeline is connected to the cooling water pool of the air-cooled condenser; The vacuum system comprises a vacuum pipeline, the vacuum pipeline is connected with the evaporator and the air condenser, and a vacuum pump is arranged on the vacuum pipeline.
[0005] Furthermore, an ejector and a booster pump are provided on the fixed hot water pipe.
[0006] Furthermore, the exhaust side of the air-cooled condenser is also connected to the cold air blower through a hot air regulating pipeline, and an adjusting damper is provided on the hot air regulating pipeline.
[0007] Furthermore, the air-cooled condenser is located at the lower part of the evaporator, and a hot air discharge pipeline is connected to the air outlet side of the air-cooled condenser, and a distance is provided between the hot air discharge end of the hot air discharge pipeline and the evaporator.
[0008] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The novel boiler continuous discharge autothermal desalination system of the present invention combines the two process modes of low-temperature multi-effect and multi-stage flash evaporation to recycle the heat of the fixed discharge and continuous discharge of the power plant. The fixed discharge and continuous discharge wastewater are graded and utilized multiple times according to the corresponding properties, so as to achieve more energy-saving output of finished water, reduce heat source loss, and improve energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram according to an embodiment of the present invention.
[0010] Description of reference numerals in the accompanying drawings: 1. Evaporator; 2. Air-cooled condenser; 3. Flash tank; 4. Continuous expansion tank; 5. Fixed-row expansion tank; 6. Vacuum pump; 7. Cold air blower; 8. Ejector; 9. Booster pump; 10. Brine transfer pump; 11. Cooling circulation water pump; 12. Finished product water pump; 13. Adjusting damper; 14. Fixed-row hot water pipeline; 15. Brine transfer pipeline; 16. Cooling water tank; 17. Cooling circulation pipeline; 18. Brine discharge pipeline; 19. Finished product water pipeline; 20. Side air supply pipeline; 21. Lower air supply pipeline; 22. Vacuum pipeline; 23. Hot air regulating pipeline. DETAILED DESCRIPTION
[0011] The present invention provides a novel boiler drainage self-heating desalination system, which is applied to the recovery of fixed and row drainage heat in power plants. The system utilizes the self-heating of boiler drainage to desalinate the drainage, thereby solving the problem of low energy utilization rate in existing solutions, achieving more reasonable and efficient utilization of drainage, reducing heat source loss, and recycling wastewater after desalination.
[0012] See also Figure 1 A novel boiler-discharged water self-heating desalination system according to one embodiment of the present invention includes a heating evaporation and water supply system, a brine discharge and cooling circulation system, a finished water discharge system, a cold air system, and a vacuum system.
[0013] The heating evaporation and water supply system includes a serial expansion tank 4, a flash tank 3, an evaporator 1 and an air-cooled condenser 2 connected in sequence. Among them, the evaporator 1 is a multi-effect evaporator (sequential effect evaporation system), which at least includes a first-effect evaporator, a second-effect evaporator and a third-effect evaporator connected in sequence. The last-effect evaporator is called a last-effect evaporator, which is connected to the air-cooled condenser 2. The basic structure of each effect evaporator is roughly the same as that of the air-cooled condenser 2. They all have a chamber, a steam heat exchange pipeline inside the chamber, and a water spraying device above the steam heat exchange pipeline. The steam heat exchange pipeline is mainly hot steam. The water spraying device sprays relatively low-temperature salt water on the outer surface of the steam heat exchange pipeline, so that the water evaporates in the chamber and enters the steam heat exchange pipeline of the next stage through the gas discharge pipeline connected to the chamber. In this way, it is heated step by step and finally condensed into water in the steam heat exchange pipeline of the air-cooled condenser 2. The steam output end of the flash tank 3 is connected to the steam input end of the first effect evaporator of the evaporator 1, and the drainage end of the flash tank 3 is connected to the spray water device of the first effect evaporator of the evaporator 1. It also includes a fixed row expansion tank 5, which is connected to the continuous row expansion tank 4, and the fixed row expansion tank 5 is connected to the spray water device of the second effect evaporator of the evaporator 1 through a fixed row hot water pipeline 14.
[0014] When the heating evaporation and water supply system is working, the heating hot water comes from the continuous row expansion tank and the fixed row expansion tank, the continuous row hot water is sent to the flash tank of the self-heating desalination equipment, and the fixed row sewage is used as make-up water to supplement the second effect water inlet side of the evaporator. The fixed row sewage is used because the salt content of the fixed row sewage is very low, and entering the system can ensure that the equipment is not easy to scale. At the same time, the fixed row sewage still has a high temperature, generally at 100°C, which can improve the thermal efficiency of the system. At the same time, reducing the fixed row hot water discharge can reduce the cooling mixed water consumption. Further preferably, an ejector 8 and a booster pump 9 are provided on the fixed row hot water pipeline 14. Since the fixed row expansion tank is installed at a lower position, the pressure is generally not easy to supply to a higher position, so it is necessary to set up a booster pump for boosting water supply. Since the fixed row hot water is generally in a saturated state, the water pump is prone to cavitation, so a booster ejector is set, and the ejector is used to boost the water in front of the pump to ensure that the water pump does not cavitation. The water supply system is divided into two routes, one for supplying water to the evaporation equipment and the other for supplying water to the ejector; after the hot water passes through the flash tank, it enters the first effect of the evaporator as a heating heat source, or the fixed drainage water passes through the ejector and booster pump and enters the water inlet side of the second effect of the evaporator, and is finally discharged to the air-cooled condenser after being heated step by step.
[0015] The brine discharge and cooling circulation system includes a brine transfer pipeline 15. The brine discharge end at the bottom of the chamber of the last effect evaporator of the evaporator 1 is connected to the exhaust side of the air-cooled condenser 2 through the brine transfer pipeline 15. A brine transfer pump 10 is provided in the brine transfer pipeline 15. The bottom of the exhaust side of the air-cooled condenser 2 is connected to a cooling water pool 16 at the bottom of the air-cooled condenser 2. The cooling water pool 16 is connected to the spray water device of the air-cooled condenser 2 through a cooling circulation pipeline 17. A cooling circulation water pump 11 is provided on the cooling circulation pipeline 17. A concentrated brine discharge pipeline 18 is also connected to the cooling circulation pipeline 17.
[0016] The brine discharge and cooling circulation system can be divided into two parts. One part is that the end-effect brine of the evaporator needs to be pressurized and discharged out of the negative pressure system. The system is equipped with a brine transfer pump to drain water to the exhaust side of the air-cooled condenser. After cooling, the brine is discharged to the cooling water pool of the air-cooled condenser; the second part is the air-cooled spray water circulation and brine discharge. The system is equipped with a cooling circulation water pump to increase the water pressure. The pump outlet supplies water to the condenser spray water device one way and discharges the concentrated brine one way; the air-cooled condenser is equipped with condenser spray water to make the evaporator discharge brine for further cooling.
[0017] The finished water discharge system includes a finished water pipeline 19 . The drainage end of the condensate pipeline of the air-cooled condenser 2 is connected to the finished water pipeline 19 . The finished water pipeline 19 is provided with a finished water pump 12 .
[0018] The finished water discharge system is equipped with a finished water pump to increase the finished water pressure in the final evaporator, discharge it out of the negative pressure system, and complete the finished water output for external supply.
[0019] The cold air system includes a cold air blower 7, the cold air output end of the cold air blower 7 is connected to a side air supply duct 20 and a lower air supply duct 21, the side air supply duct 20 is connected to the side of the air-cooled condenser 2, and the lower air supply duct 21 is connected to the cooling water pool 16 of the air-cooled condenser 2.
[0020] After the cold air blower of the cold air system, the cold air enters the air condenser in two ways, one way is sent in from the side, and the other way is sent in from the bottom. The discharged hot air is discharged directly under normal circumstances. Preferably, the exhaust side of the air condenser 2 is also connected to the cold air blower 7 through a hot air regulating pipe 23, and an adjusting damper 13 is provided on the hot air regulating pipe 23; in other words, the discharged hot air is set to return to the fan inlet and is provided with an air-cooled regulating damper, so that part of the hot air can be sent to the fan inlet in the cold winter season, and the fan inlet air temperature can be adjusted and controlled (the inlet air temperature is increased) to prevent the inlet air temperature from being too low to cause local ice formation in the condenser and freezing damage. Preferably, the air-cooled condenser 2 is located at the lower part of the evaporator 1, and a hot air discharge pipeline is connected to the exhaust port side of the air-cooled condenser 2. There is a spacing distance between the hot air discharge end (end) of the hot air discharge pipeline and the evaporator 1, so that the hot air is discharged to a certain height and a certain distance from the evaporator, and then discharged, so that the discharged humid hot air is kept away from the surface of the evaporator 1 to prevent water vapor from freezing on the surface of the equipment in winter.
[0021] The vacuum system comprises a vacuum pipeline 22 , which is connected to the evaporator 1 and the air-cooled condenser 2 , and a vacuum pump 6 is provided on the vacuum pipeline 22 .
[0022] The main function of the vacuum system is to establish vacuum at startup and to timely extract the non-condensable gas of the equipment during operation to maintain the operating vacuum of the system. The non-condensable gas is discharged effect by effect, and finally discharged to the condenser, and then discharged out of the system through the vacuum pump.
[0023] In summary, low-temperature multi-effect and multi-stage flash evaporation technologies are commonly used technologies for thermal desalination of seawater. The novel boiler-discharged water autothermal desalination system of the present invention combines the two process modes of low-temperature multi-effect and multi-stage flash evaporation to recycle the heat of the fixed and continuous discharge of the power plant, reduce heat source loss, and improve energy utilization. It should be noted that the specific structure of each basic component in the technical solution of the present invention can adopt the existing technology, and it is sufficient to achieve the corresponding required functions, so it will not be described in detail.
Claims
1. A new type of boiler and wastewater self-heating desalination system, characterized in that: Including heating evaporation and water supply system, brine discharge and cooling circulation system, finished water discharge system, cold air system, vacuum system; The heating evaporation and water supply system comprises a row expansion tank (4), a flash tank (3), an evaporator (1) and an air condenser (2) which are connected in sequence, wherein the evaporator (1) is a multiple-effect evaporator, the steam output end of the flash tank (3) is connected to the steam input end of the first-effect evaporator of the evaporator (1), and the drainage end of the flash tank (3) is connected to the spray water device of the first-effect evaporator of the evaporator (1); and further comprises a fixed-row expansion tank (5), which is connected to the spray water device of the second-effect evaporator of the evaporator (1) through a fixed-row hot water pipeline (14); The brine discharge and cooling circulation system comprises a brine transfer pipeline (15); the brine discharge end of the last effect evaporator of the evaporator (1) is connected to the exhaust side of the air-cooled condenser (2) via the brine transfer pipeline (15); a brine transfer pump (10) is provided in the brine transfer pipeline (15); the bottom of the exhaust side of the air-cooled condenser (2) is connected to the cooling water pool (16) of the air-cooled condenser (2); the cooling water pool (16) is connected to the spray water device of the air-cooled condenser (2) via a cooling circulation pipeline (17); a cooling circulation water pump (11) is provided on the cooling circulation pipeline (17); and a concentrated brine discharge pipeline (18) is also connected to the cooling circulation pipeline (17); The finished water discharge system comprises a finished water pipeline (19), the drainage end of the condensate pipeline of the air-cooled condenser (2) is connected to the finished water pipeline (19), and a finished water pump (12) is provided on the finished water pipeline (19); The cold air system comprises a cold air blower (7), the cold air output end of the cold air blower (7) being connected to a side air supply pipeline (20) and a lower air supply pipeline (21), the side air supply pipeline (20) being connected to a side of the air-cooled condenser (2), and the lower air supply pipeline (21) being connected to a cooling water pool (16) of the air-cooled condenser (2); The vacuum system comprises a vacuum pipeline (22), the vacuum pipeline (22) being connected to the evaporator (1) and the air condenser (2), and a vacuum pump (6) being provided on the vacuum pipeline (22).
2. The novel boiler-water self-heating desalination system according to claim 1 is characterized in that: An ejector (8) and a booster pump (9) are provided on the fixed-discharge hot water pipeline (14).
3. The novel boiler-water self-heating desalination system according to claim 1 is characterized in that: The air outlet side of the air condenser (2) is also connected to the cold air fan (7) via a hot air regulating pipeline (23), and an regulating damper (13) is provided on the hot air regulating pipeline (23).
4. The novel boiler-water self-heating desalination system according to any one of claims 1 to 3, characterized in that: The air-cooled condenser (2) is located at the lower part of the evaporator (1); the air outlet side of the air-cooled condenser (2) is connected to a hot air discharge pipeline; and a distance is provided between the hot air discharge end of the hot air discharge pipeline and the evaporator (1).