A low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain

Abstract

The present invention discloses a low-temperature, normal-pressure evaporator for acid distillation that is easy to clean and maintain, belonging to the technical field of evaporators. The evaporation tower comprises an evaporation circulation tank and a condensation circulation tank installed at the bottom of the evaporation tower. The evaporation tower is connected to a condensation heat exchanger, which is connected to the condensation circulation tank. The condensation heat exchanger is connected to a heat pump, which is connected to a hot water energy storage tank. The heat pump is connected to a cold water energy storage tank. One side of the cold water energy storage tank is connected to the condensation heat exchanger. The hot water energy storage tank is connected to a heating heat exchanger, which is connected to the evaporation circulation tank. The heat pump is connected to a second fan, which is connected to the heating heat exchanger, which is connected to the evaporation tower. The materials and electromechanical equipment used in the system of the present invention are low-cost, have low usage conditions, and are widely applicable. In addition, heat-sensitive organic matter is not easily decomposed, making it relatively environmentally friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of evaporators, and in particular relates to a low-temperature atmospheric pressure evaporator for acid distillation which is easy to clean and maintain. Background Art

[0002] The existing evaporators for acid steaming mainly include high-temperature evaporators and atmospheric pressure ventilation evaporators. The high-temperature evaporators include enamel kettles, graphite kettles, and circulating evaporators using graphite heat exchangers.

[0003] 1. The high-temperature evaporator mainly uses steam and thermal oil as heat sources, and evaporates the waste acid in the form of evaporation + condensation. The evaporation temperature is 100-110℃, and a cooling tower is used for cooling.

[0004] The disadvantage is that the entire process is a high temperature + positive pressure environment, which places high demands on the circulation pump, mixer, and air tightness. Especially when dealing with waste acid containing hydrochloric acid, leakage is an unsolvable problem, and it is easy to cause corrosion to the equipment from the outside.

[0005] The use of a high-temperature evaporator with a circulating pump places a huge test on the material of the circulating pump and the sealing material. The high-temperature, positive-pressure acid vapor of the high-temperature evaporator is a huge hidden danger to the safety of the operators. When there are heat-sensitive materials in the waste acid, this high-temperature evaporator cannot be used;

[0006] 2. Atmospheric pressure ventilation evaporator

[0007] At present, the atmospheric pressure ventilation evaporators on the market use steam sources for evaporation when used for acid evaporation. The evaporated air is not condensed but discharged directly into the atmosphere. An exhaust gas treatment system is also required for treatment. Currently, they can only be used to evaporate non-volatile acids such as phosphoric acid and sulfuric acid. When it comes to hydrochloric acid, this type of evaporator is not suitable. Moreover, this type of evaporator is a single-effect evaporator with high energy consumption.

[0008] In order to solve the above problems, the present application proposes a low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain. Summary of the Invention

[0009] In response to the problems in the related art, the present invention proposes a low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain, so as to overcome the above-mentioned technical problems existing in the existing related art.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] The heat exchanger is connected to the heat exchanger by a fan, and the heat exchanger is connected to the evaporation tower by a fan.

[0012] Preferably, an evaporation circulation pump is installed between the evaporation circulation tank and the heating heat exchanger.

[0013] By setting up the evaporation circulation pump, the waste acid in the evaporation circulation tank can be easily extracted and introduced into the heating heat exchanger, heating from ℃ to ℃.

[0014] Preferably, a condensation circulation pump is installed between the condensation circulation tank and the condensation heat exchanger.

[0015] By setting up the condensation circulation pump, the coolant in the condensation circulation tank can be pumped into the condensation heat exchanger, cooling from ℃ to ℃.

[0016] Preferably, a first fan is installed at the bottom of the evaporation tower.

[0017] By setting the first fan, circulating air can be blown into the evaporation tower, and the circulating air contacts the heated waste acid from bottom to top, and the acid vapor and water vapor in the waste acid are quickly transferred to the circulating air.

[0018] Preferably, a hot water energy storage circulation pump is installed between the heat pump and the hot water energy storage tank.

[0019] By setting up a hot water energy storage circulation pump, the water in the hot water energy storage tank can be pumped into the condenser in the heat pump for heating, and heated from ℃ to ℃.

[0020] Preferably, a cold water energy storage circulation pump is installed between the heat pump and the cold water energy storage tank.

[0021] By setting up the cold water energy storage circulation pump, the water in the cold water energy storage tank can be pumped into the evaporator of the heat pump for cooling.

[0022] Preferably, a first packing layer, a second packing layer and a third packing layer are provided in the evaporation tower, and an air-to-air heat exchanger is provided in the evaporation tower.

[0023] The arrangement of the first packing layer, the second packing layer and the third packing layer provides a demisting and cooling effect, and the arrangement of the air-to-air heat exchanger facilitates heat conversion of the circulating air.

[0024] Preferably, the evaporation tower is provided with a first nozzle below the first packing layer, a second nozzle is provided below the third packing layer, and the second nozzle is located between the third packing layer and the second packing layer.

[0025] By disposing the first nozzle and the second nozzle, the circulating air can be easily atomized, thereby increasing the heat exchange efficiency.

[0026] Preferably, a positioning box is rotatably connected to the rotating rod, a positioning shaft is rotatably connected to the positioning box, a scraper rod is fixedly installed on the bottom end of the positioning shaft, the scraper rod is in contact with the filter screen, two scrapers are fixedly installed on the bottom end of the scraper rod, the scrapers are in contact with the bottom inner wall of the collecting cover, a worm is fixedly installed on the rotating rod, a worm wheel is fixedly installed on the positioning shaft, the worm and the worm wheel are meshed with each other, a discharge pipe is installed at the bottom of the collecting cover, and a valve is provided on the discharge pipe.

[0027] By setting the filter screen, it is convenient to filter the liquid precipitated from the acid vapor and water vapor flowing into the evaporation tower, and prevent the filler debris in the evaporation tower from entering the condensation circulation tank. At the same time, the rotating rotating rod can drive the positioning shaft to rotate through the mutual engagement of the worm and the worm wheel, and the positioning shaft drives the scraper rod to rotate, thereby cleaning the impurities on the filter screen. At the same time, the rotating scraper rod drives the scraper to push and collect the impurities collected on the collection cover, and discharge them through the discharge pipe. The setting of the positioning box can facilitate the positioning of the positioning shaft.

[0028] In summary, the technical effects and advantages of the present invention are as follows:

[0029] 1) When the waste acid evaporates, the temperature is low, only 50-55°C, which has the following advantages:

[0030] ① The evaporation tower can be made of almost all plastic materials, such as PPH / PE / FRP, etc., and no special insulation is required when installed indoors;

[0031] ②The circulating pump can be made of PP / PTFE / PVDF and other materials, and does not require cooling during operation;

[0032] ③ The material of the waste acid heating heat exchanger has a wide range of options due to its temperature advantage, and can use Hastelloy, silicon carbide, graphite, etc.

[0033] ④Thermosensitive organic matter is not easy to decompose;

[0034] ⑤ More environmentally friendly.

[0035] 2) The condensate temperature is low, only about 25°C, which has the following advantages:

[0036] ① The condensing tower can be made of almost all plastic materials, such as PPH / PE / FRP, etc., and no special insulation is required when installed indoors;

[0037] ②The circulation pump can be made of PP / PTFE / PVDF and other materials. It does not require cooling during operation and can be made of ordinary plastic pumps.

[0038] ③ The material of the condensing heat exchanger has a wide range of options due to its temperature advantage, and can use Hastelloy, silicon carbide, graphite, SUS316L, etc.

[0039] ④The condensate temperature is at room temperature, which is convenient for subsequent transportation, storage, use or disposal;

[0040] ⑤ More environmentally friendly.

[0041] 3) The cost of materials and electromechanical equipment used in the system is low.

[0042] ①The evaporator body is made of PP material, which is low in cost;

[0043] ②The heat exchanger has low operating temperature and low pressure (about 0.1-0.2Mpa), with more options and convenient cost control;

[0044] ③The pumps and fans used are conventional products that are acid- and alkali-resistant and low-cost;

[0045] 4) Normal pressure structure of evaporator

[0046] ①The evaporation / condensation body is a normal pressure structure, which can withstand pressure with thinner materials and has low material weight;

[0047] ② Under normal pressure structure, the inspection port can be opened for observation and sampling at any time, which is convenient for daily management;

[0048] ③ Under normal pressure structure, the system does not have a vacuum pump. It can operate by only maintaining the normal operation of the circulation pump. It has a high degree of automation and simple system operation. It can be unmanned 24 hours a day, reducing management costs and difficulties.

[0049] ④ There is no risk of large-scale leakage from the evaporation tower / condensation tower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of the principle structure of the system of the present invention;

[0051] Figure 2This is a schematic diagram of the internal structure of the condensation circulation tank of the present invention;

[0052] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of part A.

[0053] 1. Evaporation circulation tank; 2. Condensation circulation tank; 3. Evaporation tower; 4. Condensation heat exchanger; 5. Heat pump; 6. Hot water energy storage tank; 7. Cold water energy storage tank; 8. Second fan; 9. Heating heat exchanger; 10. Cold water energy storage circulation pump; 11. Evaporation circulation pump; 12. First fan; 13. Condensation circulation pump; 14. Hot water energy storage circulation pump; 15. Mounting pipe; 16. Collection cover; 17. Filter; 18. Motor; 19. Rotating rod; 20. Positioning box; 21. Positioning shaft; 22. Scraper rod; 23. Worm; 24. Worm gear; 25. Scraper. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0055] Reference Figure 1-Figure 3 , a low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain, includes an evaporation tower 3, an evaporation circulation tank 1 and a condensation circulation tank 2 are installed at the bottom of the evaporation tower 3, a condensation heat exchanger 4 is connected to the evaporation tower 3, the condensation heat exchanger 4 is connected to the condensation circulation tank 2, the condensation heat exchanger 4 is connected to a heat pump 5, the heat pump 5 is connected to a hot water energy storage tank 6, the heat pump 5 is connected to a cold water energy storage tank 7, one side of the cold water energy storage tank 7 is connected to the condensation heat exchanger 4, the hot water energy storage tank 6 is connected to a heating heat exchanger 9, the heating heat exchanger 9 is connected to the evaporation tower 3, and the evaporation tower 3 is connected to the condensation heat exchanger 4. The heat pump 5 is connected to the heat circulation tank 1, the second fan 8 is connected to the heating heat exchanger 9, the heating heat exchanger 9 is connected to the evaporation tower 3, and a mounting pipe 15 is fixedly installed on the top of the condensation circulation tank 2. A collecting cover 16 is fixedly installed on the top of the mounting pipe 15, and the collecting cover 16 is connected to the evaporation tower 3. A motor 18 is fixedly installed on one side of the collecting cover 16, and a rotating rod 19 is fixedly installed on the output shaft of the motor 18. A filter screen 17 is installed on the mounting pipe 15, and the rotating rod 19 is transmission-connected to the filter screen 17.

[0056] Reference Figure 1 An evaporation circulation pump 11 is installed between the evaporation circulation tank 1 and the heating heat exchanger 9. Through the setting of the evaporation circulation pump 11, the waste acid in the evaporation circulation tank 1 can be easily extracted and introduced into the heating heat exchanger 9 to be heated from 50°C to 55°C.

[0057] Reference Figure 1A condensation circulation pump 13 is installed between the condensation circulation tank 2 and the condensation heat exchanger 4. Through the setting of the condensation circulation pump 13, the coolant in the condensation circulation tank 2 can be pumped into the condensation heat exchanger 4 and cooled from 25°C to 20°C.

[0058] Reference Figure 1 A first fan 12 is installed at the bottom of the evaporation tower 3. Through the setting of the first fan 12, circulating air can be blown into the evaporation tower 3. The circulating air contacts the heated waste acid from bottom to top, and the acid vapor and water vapor in the waste acid are quickly transferred to the circulating air.

[0059] Reference Figure 1 A hot water energy storage circulation pump 14 is installed between the heat pump 5 and the hot water energy storage tank 6. Through the setting of the hot water energy storage circulation pump 14, the water in the hot water energy storage tank 6 can be pumped into the condenser in the heat pump 5 for heating, and heated from 55°C to 60°C.

[0060] Reference Figure 1 A cold water energy storage circulation pump 10 is installed between the heat pump 5 and the cold water energy storage tank 7. Through the setting of the cold water energy storage circulation pump 10, the water in the cold water energy storage tank 7 can be pumped into the evaporator of the heat pump 5 for cooling.

[0061] Reference Figure 1 A first packing layer, a second packing layer and a third packing layer are provided in the evaporation tower 3. An air-to-air heat exchanger is provided in the evaporation tower 3. The first packing layer, the second packing layer and the third packing layer are provided, which has the effect of demisting and cooling. The setting of the air-to-air heat exchanger can facilitate heat conversion of the circulating air.

[0062] Reference Figure 1 The evaporation tower 3 is provided with a first nozzle below the first packing layer, a second nozzle is provided below the third packing layer, and the second nozzle is located between the third packing layer and the second packing layer. The arrangement of the first nozzle and the second nozzle facilitates atomization of the circulating air, thereby increasing the heat exchange efficiency.

[0063] Reference Figure 2, a positioning box 20 is rotatably connected to the rotating rod 19, a positioning shaft 21 is rotatably connected to the positioning box 20, a scraper rod 22 is fixedly installed on the bottom end of the positioning shaft 21, the scraper rod 22 is in contact with the filter screen 17, two scrapers 25 are fixedly installed on the bottom end of the scraper rod 22, the scraper 25 is in contact with the bottom inner wall of the collection cover 16, a worm 23 is fixedly installed on the rotating rod 19, a worm gear 24 is fixedly installed on the positioning shaft 21, the worm 23 and the worm gear 24 are meshed with each other, a discharge pipe is installed at the bottom of the collection cover 16, and a valve is provided on the discharge pipe. Through the setting of the filter screen 17, it is easy to The liquid precipitated from the acid vapor and water vapor flowing into the evaporation tower 3 is filtered to prevent the filler debris in the evaporation tower 3 from entering the condensation circulation tank 2. At the same time, the rotating rotating rod 19 can drive the positioning shaft 21 to rotate through the mutual engagement of the worm 23 and the worm wheel 24, and the positioning shaft 21 drives the scraper rod 22 to rotate, thereby cleaning the impurities on the filter screen 17. At the same time, the rotating scraper rod 22 drives the scraper 25 to push and scrape the impurities collected on the collection cover 16, and discharge them through the discharge pipe. The setting of the positioning box 20 can facilitate the positioning of the positioning shaft 21.

[0064] A method for using a low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain comprises the following steps:

[0065] S1. Waste acid process: The waste acid first enters the evaporation circulation tank 1. Under the action of the evaporation circulation pump 11, it flows through the heating heat exchanger 9 and is heated from 50°C to 55°C. It is then atomized and sprayed from the first nozzle of the evaporation tower 3. After countercurrent with the circulating air blown up from the bottom and completing vapor transfer, it returns to the evaporation circulation tank 1.

[0066] S2. Circulating air process: Circulating air is first blown into the evaporation tower 3 from the bottom via the first fan 12. The circulating air contacts the heated waste acid from bottom to top, rapidly transferring the acid vapor and water vapor in the waste acid into the circulating air, forming high-temperature, high-humidity circulating air. After demisting through the first packing layer, the cold circulating air flows from bottom to top through channels 1-1 and 2-2 of the gas-to-gas heat exchanger, where it is pre-cooled. It then contacts the condensate from bottom to top on the second packing layer in the evaporation tower 3, where it cools. The acid vapor and water vapor precipitate into liquid and enter the condensation circulation tank 2. The dehumidified circulating air, after demisting through the packing layer 3 and then passing through channels 2-2 and 1-1 of the gas-to-gas heat exchanger for heat exchange and preheating, re-enters the first fan 12 for recirculation and moisture loading.

[0067] S3, Condensate Process: The condensate first enters the condensation circulation tank 2, flows through the condensation heat exchanger 4 under the action of the condensation circulation pump 13, and is cooled from 25°C to 20°C. It is then atomized and sprayed down from the second nozzle of the evaporation tower 3. After countercurrent with the circulating air blown up from the bottom and completing cooling and washing, it returns to the condensation circulation tank 2;

[0068] S4, hot water storage process: After the hot water is replenished into the hot water storage tank 6 by soft water, it is pumped into the condenser of the heat pump 5 main unit through the hot water storage circulation pump 14 for heating. After being heated from 55°C to 60°C, it enters the heating heat exchanger 9 to exchange heat with the waste acid, then drops to 55°C and re-enters the heat pump 5 for heating.

[0069] S5, energy storage cold water process: The energy storage cold water is replenished into the cold water energy storage tank 7 by soft water, and then pumped into the evaporator of the heat pump 5 main unit for refrigeration through the cold water energy storage circulation pump 10. After cooling from 20°C to 15°C, it enters the condensing heat exchanger 4 to exchange heat with the condensate, then rises to 20°C and re-enters the heat pump 5 for refrigeration.

[0070] The second fan 8 is used to dissipate excess heat in the heat pump 5 main unit.

[0071] An electric heating rod or a steam heater is provided in the hot water energy storage tank 6 for preheating the waste acid at startup.

[0072] S6. When the acid vapor and water vapor are precipitated into liquid and enter the condensation circulation tank 2, the setting of the filter screen 17 can facilitate the filtration of the liquid precipitated from the acid vapor and water vapor flowing into the evaporation tower 3 to prevent the filler debris in the evaporation tower 3 from entering the condensation circulation tank 2. The motor 18 switch is started, and the output shaft of the motor 18 drives the rotating rod 9 to rotate. The rotating rotating rod 19 is engaged with the worm 23 and the worm gear 24, so as to drive the positioning shaft 21 to rotate. The positioning shaft 21 drives the scraper rod 22 to rotate, thereby cleaning the impurities on the filter screen 17. At the same time, the rotating scraper rod 22 drives the scraper 25 to push and scrape the impurities collected on the collection cover 16 and discharge them through the discharge pipe. The setting of the positioning box 20 can facilitate the positioning of the positioning shaft 21.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain, comprising an evaporation tower (3), characterized in that: An evaporation circulation tank (1) and a condensation circulation tank (2) are installed at the bottom of the evaporation tower (3); a condensation heat exchanger (4) is connected to the evaporation tower (3); the condensation heat exchanger (4) is connected to the condensation circulation tank (2); the condensation heat exchanger (4) is connected to a heat pump (5); the heat pump (5) is connected to a hot water energy storage tank (6); the heat pump (5) is connected to a cold water energy storage tank (7); one side of the cold water energy storage tank (7) is connected to the condensation heat exchanger (4); the hot water energy storage tank (6) is connected to a heating heat exchanger (9); the heating heat exchanger (9) is connected to the evaporation tower (3); The heat pump (5) is connected to the circulation tank (1), the second fan (8) is connected to the heating heat exchanger (9), the heating heat exchanger (9) is connected to the evaporation tower (3), the top of the condensation circulation tank (2) is fixedly installed with a mounting pipe (15), the top of the mounting pipe (15) is fixedly installed with a collection cover (16), the collection cover (16) is connected to the evaporation tower (3), a motor (18) is fixedly installed on one side of the collection cover (16), a rotating rod (19) is fixedly installed on the output shaft of the motor (18), the mounting pipe ( 15) is provided with a filter screen (17), the rotating rod (19) is in transmission connection with the filter screen (17), a first fan (12) is provided at the bottom of the evaporation tower (3), a first packing layer, a second packing layer and a third packing layer are provided in the evaporation tower (3), an air-to-air heat exchanger is provided in the evaporation tower (3), a first nozzle is provided below the first packing layer in the evaporation tower (3), a second nozzle is provided below the third packing layer, the second nozzle is located between the third packing layer and the second packing layer, a positioning box (20) is rotatably connected to the rotating rod (19), the positioning box (20) is provided at the bottom of the evaporation tower (3), a first packing layer, a second packing layer and a third packing layer are provided in the evaporation tower (3), a first nozzle is provided below the first packing layer in the evaporation tower (3), a second nozzle is provided below the third packing layer, the second nozzle is located between the third packing layer and the second packing layer, a positioning box (20) is rotatably connected to the rotating rod (19), the positioning box (20) is provided at the bottom of the evaporation tower (3), and the positioning box (20) is provided at the bottom of the evaporation tower (3). The box (20) is rotatably connected to a positioning shaft (21), a scraper rod (22) is fixedly installed at the bottom end of the positioning shaft (21), the scraper rod (22) and the filter screen (17) are in contact with each other, two scrapers (25) are fixedly installed at the bottom end of the scraper rod (22), the scrapers (25) and the bottom inner wall of the collection cover (16) are in contact with each other, a worm (23) is fixedly installed on the rotating rod (19), a worm wheel (24) is fixedly installed on the positioning shaft (21), the worm (23) and the worm wheel (24) are meshed with each other, and a discharge pipe is installed at the bottom of the collection cover (16), and a valve is provided on the discharge pipe.

2. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 1, characterized in that: An evaporation circulation pump (11) is installed between the evaporation circulation tank (1) and the heating heat exchanger (9).

3. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 2, characterized in that: A condensation circulation pump (13) is installed between the condensation circulation tank (2) and the condensation heat exchanger (4).

4. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 1, characterized in that: A hot water energy storage circulation pump (14) is installed between the heat pump (5) and the hot water energy storage tank (6).

5. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 1, characterized in that: A cold water energy storage circulation pump (10) is installed between the heat pump (5) and the cold water energy storage tank (7).

6. The method for using the low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Waste acid process: The waste acid first enters the evaporation circulation tank (1), flows through the heating heat exchanger (9) under the action of the evaporation circulation pump (11), and is heated from 50°C to 55°C. It is then atomized and sprayed from the first nozzle of the evaporation tower (3), and after convection with the circulating air blown up from the bottom and completing the steam transfer, it returns to the evaporation circulation tank (1); S2, circulating air process: the circulating air is first blown into the evaporation tower (3) from the bottom through the first fan (12), and the circulating air contacts the heated waste acid from bottom to top. The acid vapor and water vapor in the waste acid are quickly transferred to the circulating air, forming high-temperature and high-humidity circulating air. After demisting through the first packing layer, the cold circulating air flows from bottom to top through the channels 1-1 and 2-2 of the gas-to-gas heat exchanger and is pre-cooled. It contacts the condensate on the second packing layer from bottom to top in the evaporation tower (3) and becomes cold. The acid vapor and water vapor therein precipitate into liquid and enter the condensation circulation tank (2). The dehumidified circulating air flows through the packing layer for demisting and then flows through the hot circulating air of the channels 2-2 and 1-1 of the gas-to-gas heat exchanger for heat exchange and preheating, and then re-enters the first fan (12) for re-circulation and moisture loading. S3, condensate flow: the condensate first enters the condensation circulation tank (2), flows through the condensation heat exchanger (4) under the action of the condensation circulation pump (13), and is cooled from 25°C to 20°C. It is then atomized and sprayed from the second nozzle of the evaporation tower (3), and after convection with the circulating air blown up from the bottom and completing the cooling and washing, it returns to the condensation circulation tank (2); S4, hot water storage process: After the hot water is added to the hot water storage tank (6) by soft water, it is pumped into the condenser of the heat pump (5) main unit through the hot water storage circulation pump (14) for heating. After being heated from 55°C to 60°C, it enters the heating heat exchanger (9) for heat exchange with the waste acid, and then cools down to 55°C and re-enters the heat pump (5) for heating; S5, energy storage cold water process: After the energy storage cold water is replenished into the cold water energy storage tank (7) by soft water, it is pumped into the evaporator of the heat pump (5) for refrigeration through the cold water energy storage circulation pump (10). After cooling from 20°C to 15°C, it enters the condensation heat exchanger (4) for heat exchange with the condensate, and then rises to 20°C and re-enters the heat pump (5) for refrigeration; The second fan (8) is used to dissipate excess heat in the heat pump (5) main unit; An electric heating rod or a steam heater is provided in the hot water energy storage tank (6) for preheating the waste acid at startup; S6. When the acid vapor and water vapor are precipitated into liquid and enter the condensation circulation tank (2), the setting of the filter screen (17) can facilitate the filtration of the liquid precipitated from the acid vapor and water vapor flowing into the evaporation tower (3), and prevent the filler debris in the evaporation tower (3) from entering the condensation circulation tank (2). The motor (18) switch is started, and the output shaft of the motor (18) drives the rotating rod (19) to rotate. The rotating rotating rod (19) is engaged with the worm (23) and the worm wheel (24), thereby driving the positioning shaft (21) to rotate. The positioning shaft (21) drives the scraper (22) to rotate, thereby cleaning the impurities on the filter screen (17). At the same time, the rotating scraper (22) drives the scraper (25) to push and scrape the impurities collected on the collection cover (16) and discharge them through the discharge pipe. The setting of the positioning box (20) can facilitate the positioning of the positioning shaft (21).

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