Easily cleaned and maintained low-temperature normal-pressure evaporator for steaming acid

Abstract

The invention discloses an easy-to-clean and easy-to-maintain low-temperature normal-pressure evaporator for steaming acid, and belongs to the technical field of evaporators, the easy-to-clean and easy-to-maintain low-temperature normal-pressure evaporator comprises an evaporation tower, an evaporation circulating tank and a condensation circulating tank are mounted at the bottom of the evaporation tower, the evaporation tower is connected with a condensation heat exchanger, and the condensation heat exchanger is connected with the condensation circulating tank; the condensation heat exchanger is connected with a heat pump, the heat pump is connected with a hot water energy storage box, the heat pump is connected with a cold water energy storage box, one side of the cold water energy storage box is connected with the condensation heat exchanger, the hot water energy storage box is connected with a heating heat exchanger, and the heating heat exchanger is connected with an evaporation circulation tank. The heat pump is connected with a second fan, the second fan is connected with a heating heat exchanger, and the heating heat exchanger is connected with the evaporation tower. Materials and electromechanical equipment used by the system are low in manufacturing cost, use conditions are low, the application range is wide, thermosensitive organic matter is not prone to decomposition, and the system is 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 distillation mainly include high-temperature evaporators and atmospheric pressure ventilation evaporators, among which 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 heat transfer oil as heat sources, and evaporates the waste acid in the form of evaporation + condensation. The evaporation temperature is 100-110°C, and a cooling tower is used for cooling.

[0004] The disadvantage is that the whole process is a high temperature + positive pressure environment, which has high requirements for the circulation pump, mixer, and air tightness. Especially when dealing with waste acid containing hydrochloric acid, leakage is a problem that cannot be solved, and it is easy to cause corrosion to the equipment from the outside.

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

[0006] 2. Normal pressure ventilation evaporator

[0007] At present, the atmospheric pressure ventilation evaporators on the market use steam sources for evaporation when used for acid evaporation, and the wind after evaporation is not condensed but discharged directly into the atmosphere. An exhaust gas treatment system is also required for treatment. Currently, it can only be used to evaporate non-volatile acids such as phosphoric acid and sulfuric acid. This type of evaporator is not suitable for hydrochloric acid. Moreover, this type of evaporator is single-effect evaporation 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 which is easy to clean and maintain. Summary of the invention

[0009] In view of 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] A low-temperature atmospheric pressure evaporator for acid distillation which is easy to clean and maintain, comprises an evaporation tower, an evaporation circulation tank and a condensation circulation tank are installed at the bottom of the evaporation tower, a condensation heat exchanger is connected to the evaporation tower, the condensation heat exchanger is connected to the condensation circulation tank, a heat pump is connected to the condensation heat exchanger, a hot water energy storage tank is connected to the heat pump, a cold water energy storage tank is connected to one side of the cold water energy storage tank, a heating heat exchanger is connected to the hot water energy storage tank, the heating heat exchanger is connected to the evaporation circulation tank, a second fan is connected to the heat pump, the second fan is connected to the heating heat exchanger, the heating heat exchanger is connected to the evaporation tower, a mounting pipe is fixedly installed on the top of the condensation circulation tank, a collecting hood is fixedly installed on the top of the mounting pipe, the collecting hood is connected to the evaporation tower, a motor is fixedly installed on one side of the collecting hood, a rotating rod is fixedly installed on the output shaft of the motor, a filter screen is installed on the mounting pipe, and the rotating rod is drivingly connected to the filter screen.

[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 to be heated 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 providing a cold water energy storage circulation pump, water in the cold water energy storage tank can be pumped into the evaporator of the heat pump for refrigeration.

[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 first packing layer, the second packing layer and the third packing layer are provided to achieve a demisting and cooling effect, and the air-to-air heat exchanger is provided to facilitate 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 and the filter screen are in contact with each other, 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, so as to clean the impurities on the filter screen. At the same time, the rotating scraper rod drives the scraper plate to push and scrape 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 choices due to its temperature advantage, and can use Hastelloy, silicon carbide, graphite, etc.;

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

[0034] ⑤More 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] ② The circulation pump can be made of PP / PTFE / PVDF and other materials. It does not need to be cooled during operation, so an ordinary plastic pump can be used;

[0038] ③ The material of the condensing heat exchanger has a wide range of choices 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] ⑤More environmentally friendly.

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

[0042] ①The main body of the evaporator is made of PP material, which is relatively 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 acid- and alkali-resistant products with low cost;

[0045] 4) Normal pressure structure of evaporator

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

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

[0048] ③ Under the normal pressure structure, the system has no vacuum pump. The system can operate only by maintaining the normal operation of the circulation pump. The system has a high degree of automation and is easy to operate. It can be unattended 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 It 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. Installation pipe; 16. Collection cover; 17. Filter; 18. Motor; 19. Rotating rod; 20. Positioning box; 21. Positioning shaft; 22. Scraper rod; 23. Worm; 24. Worm wheel; 25. Scraper. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be described clearly and completely 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 which is easy to clean and maintain, comprises 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, a heat pump 5 is connected to the condensation heat exchanger 4, a hot water energy storage tank 6 is connected to the heat pump 5, a cold water energy storage tank 7 is connected to the heat pump 5, 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 the 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 exchanger 9, the second fan 8 is connected to the heating heat exchanger 9, the heating heat exchanger 9 is connected to the evaporation tower 3, a mounting pipe 15 is fixedly installed on the top of the condensation circulation tank 2, a collecting hood 16 is fixedly installed on the top of the mounting pipe 15, the collecting hood 16 is connected to the evaporation tower 3, a motor 18 is fixedly installed on one side of the collecting hood 16, 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 drivingly 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, it is convenient to pump the water in the cold water energy storage tank 7 into the evaporator of the heat pump 5 for refrigeration.

[0061] Reference Figure 1 A first packing layer, a second packing layer and a third packing layer are arranged in the evaporation tower 3. An air-to-air heat exchanger is arranged in the evaporation tower 3. The first packing layer, the second packing layer and the third packing layer have the effect of defogger and cooler. The arrangement of the air-to-air heat exchanger facilitates 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. By arranging the first nozzle and the second nozzle, the circulating air can be atomized, thereby increasing the heat exchange efficiency.

[0063] Reference Figure 2A positioning box 20 is rotatably connected to the rotating rod 19, and a positioning shaft 21 is rotatably connected to the positioning box 20. A scraper rod 22 is fixedly installed at the bottom end of the positioning shaft 21. The scraper rod 22 contacts the filter screen 17. Two scrapers 25 are fixedly installed at the bottom end of the scraper rod 22. The scraper 25 contacts the bottom inner wall of the collection cover 16. A worm 23 is fixedly installed on the rotating rod 19, and 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. 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. The positioning shaft 21 drives the scraper rod 22 to rotate, so as to clean the impurities on the filter screen 17. At the same time, the rotating scraper rod 22 drives the scraper plate 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, comprising the following steps:

[0065] 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, is heated from 50°C to 55°C, and then is atomized and sprayed from the first nozzle of the evaporation tower 3, and is convected with the circulating air blown up from the bottom and completes the steam transfer, and then returns to the evaporation circulation tank 1;

[0066] 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 flowing from bottom to top through the channels 1-1 and 2-2 of the gas-to-gas heat exchanger is precooled, and contacts the condensate on the second packing layer from bottom to top in the evaporation tower 3 to become cold, and the acid vapor and water vapor therein are precipitated into liquid and enter the condensation circulation tank 2. The dehumidified circulating air flows through the packing layer 3 for demisting, 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 carrying.

[0067] S3, condensate flow: the condensate first enters the condensate circulation tank 2, flows through the condensate heat exchanger 4 under the action of the condensate circulation pump 13, and is cooled from 25°C to 20°C, and then is atomized and sprayed from the second nozzle of the evaporation tower 3, and is convected with the circulating air blown up from the bottom and completes the cooling and washing, and then returns to the condensate circulation tank 2;

[0068] S4, energy storage hot water process: The energy storage hot water is replenished into the hot water storage tank 6 by soft water, and then pumped into the condenser of the heat pump 5 host 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 system is replenished into the cold water energy storage tank 7 by soft water, and then pumped into the evaporator of the heat pump 5 host 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 arranged 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 can drive the positioning shaft 21 to rotate through the mutual engagement of the worm 23 and the worm wheel 24. 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 plate 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-temperature atmospheric pressure evaporator for acid distillation which 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 circulation tank (1); the heat pump (5) is connected to a A second fan (8) is connected, the second fan (8) is connected to a heating heat exchanger (9), the heating heat exchanger (9) is connected to an evaporation tower (3), a mounting pipe (15) is fixedly mounted on the top of the condensation circulation tank (2), a collecting hood (16) is fixedly mounted on the top of the mounting pipe (15), the collecting hood (16) is connected to the evaporation tower (3), a motor (18) is fixedly mounted on one side of the collecting hood (16), a rotating rod (19) is fixedly mounted on the output shaft of the motor (18), a filter screen (17) is mounted on the mounting pipe (15), and the rotating rod (19) is in driving connection with the filter screen (17).

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 first fan (12) is installed at the bottom of the evaporation tower (3).

5. The low-temperature atmospheric pressure evaporator for acid distillation which 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).

6. The low-temperature atmospheric pressure evaporator for acid distillation which 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).

7. The low-temperature atmospheric pressure evaporator for acid distillation which is easy to clean and maintain according to claim 1, characterized in that: A first packing layer, a second packing layer and a third packing layer are provided in the evaporation tower (3), and an air-to-air heat exchanger is provided in the evaporation tower (3).

8. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 1, characterized in that: The evaporation tower (3) is provided with a first nozzle located below the first packing layer, a second nozzle is located below the third packing layer, and the second nozzle is located between the third packing layer and the second packing layer.

9. The low-temperature atmospheric pressure evaporator for acid distillation that is easy to clean and maintain according to claim 1, characterized in that: The rotating rod (19) is rotatably connected to a positioning box (20), and the positioning 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), and 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), and the scrapers (25) and the bottom inner wall of the collecting cover (16) are in contact with each other. A worm (23) is fixedly installed on the rotating rod (19), and 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. A discharge pipe is installed at the bottom of the collecting cover (16), and a valve is provided on the discharge pipe.

10. The method for using the low-temperature atmospheric pressure evaporator for acid distillation which is easy to clean and maintain according to claims 1-9, 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), is heated from 50°C to 55°C, and then is atomized and sprayed down from the first nozzle of the evaporation tower (3), and after convection with the circulating air blown up from the bottom and steam transfer is completed, 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 being demisted by the first packing layer, the cold circulating air flowing from bottom to top through the channels 1-1 and 2-2 of the gas-to-gas heat exchanger is precooled, and then contacts the condensate on the second packing layer from bottom to top in the evaporation tower (1) to become cold, and the acid vapor and water vapor therein are precipitated into liquid and enter the condensation circulation tank (2). The dehumidified circulating air flows through the packing layer (3) 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 carrying. S3, condensate flow: the condensate first enters the condensate circulation tank (2), flows through the condensate heat exchanger (4) under the action of the condensate circulation pump (13), is cooled from 25°C to 20°C, is then atomized and sprayed down from the second nozzle of the evaporation tower (3), and is convected with the circulating air blown up from the bottom to complete the cooling and washing, and then returns to the condensate 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, then drops to 55° C. and re-enters the heat pump (5) for heating. S5, energy storage cold water process: The energy storage cold water system is replenished into the cold water energy storage tank (7) by soft water, and then 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) to exchange heat 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 main unit of the heat pump (5). An electric heating rod or a steam heater is arranged 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 filter screen (17) is provided to facilitate filtering 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) can drive the positioning shaft (21) to rotate through the mutual engagement of the worm (23) and the worm wheel (24). 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 plate (25) to push and scrape the impurities collected on the collection cover (16) and discharge them through the discharge pipe. The positioning box (20) is provided to facilitate positioning the positioning shaft (21).

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