Evaporation crystallization equipment and evaporation treatment method for liquid material

Abstract

The present invention provides an evaporation crystallization device and a method for evaporating and treating a liquid material. The evaporation crystallization device includes: an air circulation system; a liquid material circulation system, which includes a liquid storage tank for storing the liquid material, a first liquid delivery pipeline, and a power pump. The liquid storage tank is communicated with the circulation air duct, and the inlet end of the first liquid delivery pipeline is communicated with the liquid storage tank, and the outlet end of the first liquid delivery pipeline is communicated with the circulation air duct. The air flow in the circulation air duct contacts the liquid material output from the outlet end of the first liquid delivery pipeline to form humid air; a heat pump system, which includes a circulation loop and a compressor, a switching device, a heat exchanger, an expansion valve, and an evaporator sequentially arranged on the circulation loop. The humid air is cooled by the evaporator to precipitate condensed water. The heat pump system further includes a condenser arranged in parallel with the evaporator, so that the heat exchanger can provide the heat required for evaporative concentration of the liquid material or the cold required for cooling crystallization. The evaporation crystallization device of the technical solution of the present invention can effectively improve the crystallization efficiency of the liquid material.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular, to an evaporation crystallization device and a method for evaporating and treating a liquid material. Background Art

[0002] In industrial applications, when it is necessary to remove harmful components from process gases, chemical absorption is usually used to purify the gases. Generally, by selecting a suitable solvent to chemically react with the gas components to be removed, in this way, the harmful components in the gas can be effectively absorbed, and the removal efficiency of the harmful components can be improved. Taking the deodorization equipment for animal houses as an example, in order to remove a large amount of ammonia gas generated by animal feces, an acid solution is generally selected as the absorbent to absorb ammonia gas, and the ammonium salt waste liquid formed by the reaction of the above acid solution and ammonia gas cannot be discharged randomly and needs to be solidified.

[0003] A waste liquid treatment device known to the inventor generally directly performs evaporation and concentration treatment on the waste liquid to make the waste liquid evaporate, concentrate and crystallize. The efficiency of the above waste liquid treatment device in treating the waste liquid is low, resulting in a low crystallization efficiency of the waste liquid. Summary of the Invention

[0004] The main object of the present invention is to provide an evaporation crystallization device and a method for evaporating and treating a liquid material, and the above evaporation crystallization device can effectively improve the crystallization efficiency of the liquid material.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an evaporation crystallization device, including: an air circulation system, including a circulation air duct and a fan located in the circulation air duct; a liquid material circulation system, including a liquid storage tank for storing the liquid material, a first liquid delivery pipeline, and a power pump located on the first liquid delivery pipeline. The liquid storage tank is communicated with the circulation air duct, and the inlet end of the first liquid delivery pipeline is communicated with the liquid storage tank, and the outlet end of the first liquid delivery pipeline is communicated with the circulation air duct. The air flow in the circulation air duct contacts the liquid material output from the outlet end of the first liquid delivery pipeline to form humid air; a heat pump system, including a circulation loop and a compressor, a switching device, a heat exchanger, an expansion valve, and an evaporator sequentially arranged on the circulation loop. The evaporator is located in the circulation air duct, and the humid air is cooled by the evaporator to precipitate condensed water. The heat exchanger is used for heat exchange of the liquid material located in the first liquid delivery pipeline. The heat pump system further includes a condenser arranged in parallel with the evaporator, so that the heat exchanger can provide the heat required for evaporation and concentration of the liquid material or the cold required for cooling and crystallization.

[0006] Furthermore, the circulation air duct is located above the liquid storage tank, so that the air flow in the circulation air duct contacts the liquid material output from the outlet end of the first liquid delivery pipeline in a countercurrent manner.

[0007] Further, the evaporation crystallization device further includes a flow guiding plate disposed in the circulation air duct, the flow guiding plate being located between the outlet end of the first liquid delivery pipeline and the liquid storage tank, and the flow guiding plate being provided with a plurality of through holes which are arranged at intervals and through which air can pass.

[0008] Further, in the vertical direction, the evaporation crystallization device includes a plurality of flow guiding plates which are arranged at intervals in the vertical direction.

[0009] Further, the evaporation crystallization device further includes a buffer plate located in the circulation air duct, and the buffer plate is arranged between the flow guiding plate and the liquid storage tank.

[0010] Further, the air circulation system further includes a first air duct housing and a second air duct housing connected to the first air duct housing. The interiors of the first air duct housing and the second air duct housing form a circulation air duct. The flow guiding plate and the buffer plate are located in the first air duct housing, and the fan is located in the second air duct housing.

[0011] Further, the evaporation crystallization device further includes a liquid blocking portion located in the circulation air duct, and the liquid blocking portion is located between the outlet end of the first liquid delivery pipeline and the evaporator.

[0012] Further, the heat pump system further includes a heat dissipation portion located on the circulation loop, and the heat dissipation portion is located between the expansion valve and the heat exchanger.

[0013] Further, the switching device is a four-way valve. The four-way valve has a first port, a second port, a third port, and a fourth port. The first port is communicated with the outlet of the compressor, the third port is communicated with the inlet of the compressor, the second port is communicated with the heat exchanger, and the fourth port is communicated with the evaporator or the condenser.

[0014] Further, the first liquid delivery pipeline includes a first pipe section and a second pipe section which are communicated with each other, and a first solenoid valve located on the second pipe section. The power pump and the heat exchanger are located on the first pipe section. The second pipe section is communicated with the circulation air duct. The liquid material circulation system further includes a second liquid delivery pipeline and a second solenoid valve located on the second liquid delivery pipeline. One end of the second liquid delivery pipeline is communicated with the second pipe section, and the other end of the second liquid delivery pipeline is communicated with the liquid storage tank; alternatively, the evaporation crystallization device further includes a water inlet, a water replenishing pipeline communicated with the water inlet, and a water inlet solenoid valve located between the water inlet and the water replenishing pipeline. The water inlet is communicated with the liquid storage tank.

[0015] According to another aspect of the present invention, the present invention provides a method for evaporating and treating a liquid material. The method for evaporating and treating the liquid material uses the above-mentioned evaporation crystallization device to treat the liquid material.

[0016] Further, the method for evaporating and treating the liquid material includes: a concentration step of removing water and concentrating the liquid material by using the circulating air flow in the circulation air duct; a cooling crystallization step of cooling and crystallizing the concentrated liquid material by using the heat exchanger.

[0017] Further, before the concentration step, the evaporation treatment method of the feed liquid further includes a heating step of heating the feed liquid by using a heat exchanger; or, after the cooling crystallization step, the evaporation treatment method of the feed liquid further includes a solid-liquid separation step of separating the crystals and the clear liquid formed by the feed liquid.

[0018] Further, the concentration step includes: a water removal step in which a circulating gas stream comes into countercurrent contact with the feed liquid to absorb the moisture in the feed liquid; and a condensation step in which the air with moisture is cooled by using an evaporator to precipitate condensed water.

[0019] Applying the technical solution of the present invention, by setting up an air circulation system, a feed liquid circulation system and a heat pump system, the heat exchanger of the heat pump system can be used to heat the feed liquid, and then the circulating gas stream is brought into contact with the heated feed liquid to take away the moisture in the feed liquid and form wet air, and then the evaporator of the heat pump system is used to cool the wet air and precipitate condensed water from the wet air. In this way, through multiple cycles of the gas stream, the feed liquid can be evaporated and concentrated; after the feed liquid is concentrated, the switching device can be used to change the flow direction of the medium in the circulation loop so that the heat exchanger can cool the concentrated feed liquid, thereby causing the concentrated feed liquid to cool and crystallize. Using the above evaporation crystallization equipment to first evaporate and concentrate the feed liquid, and then cool down the feed liquid, the crystallization efficiency of the feed liquid can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 shows a schematic structural diagram of an evaporation crystallization device according to an embodiment of the present invention;

[0022] Figure 2 shows a schematic flow diagram of an evaporation treatment method of a feed liquid according to an embodiment of the present invention; and

[0023] Figure 3 shows Figure 2 a schematic flow diagram of the concentration step of the evaporation treatment method of the feed liquid.

[0024] Wherein, the above-mentioned drawings include the following reference numerals:

[0025] 1. Circulating air duct; 10. Air circulation system; 101. First air duct housing; 102. Second air duct housing; 11. Feed solenoid valve; 12. Power pump; 13. First solenoid valve; 14. Second solenoid valve; 15. Buffer plate; 16. Deflector; 17. Liquid retaining part; 18. Fan; 19. Water inlet solenoid valve; 2. Circulation loop; 20. Heat pump system; 21. Compressor; 22. Switching device; 23. Heat exchanger; 24. Heat dissipation part; 25. Expansion valve; 26. Evaporation solenoid valve; 27. Evaporator; 28. Condensation solenoid valve; 29. Condenser; 30. Drainage system; 31. Liquid outlet solenoid valve; 32. Solid-liquid separation device; 33. Clear liquid; 34. Crystal; 40. Feed liquid circulation system; 41. First liquid delivery pipeline; 411. First pipe section; 412. Second pipe section; 42. Second liquid delivery pipeline; 110. Liquid storage tank. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] It should be noted that the reaction crystallization method, direct cooling crystallization method or MVR evaporation concentration crystallization method can also be applied to treat the wastewater feed liquid. Among them, the reaction crystallization method generally adds materials that can chemically react with the waste liquid to generate precipitates to remove target ions. The precipitation reaction effect is restricted by many factors such as pH value, feeding ratio, and reaction time, and the cost of adding materials is relatively high. The direct cooling crystallization method directly cools the waste liquid, but the cooling range is limited, the change of supersaturation is small, the crystallization efficiency is low, and the operation energy efficiency is low. The MVR evaporation concentration crystallization has high efficiency, but the system is complex, the equipment cost is high, the floor area is large, and it is not suitable for the working conditions with small treatment loads. Therefore, the embodiments of the present invention provide an evaporation crystallization device, and the above evaporation crystallization device is applicable to the wastewater treatment working conditions with small crystallization loads, intermittent crystallization operations and the solubility of solutes in the feed liquid decreasing with the decrease of temperature.

[0028] It should be noted that the evaporation crystallization device of the embodiments of the present invention has a small floor area, reliable structure, simple operation, low cost, and high operation energy efficiency.

[0029] It should be noted that in the embodiments of the present invention, humid air refers to air with moisture. Humid air is divided into saturated air and unsaturated air according to relative humidity. In the embodiments of the present invention, when the air flow is in full contact with the feed liquid, saturated air can be formed, and in this way, the concentration of the feed liquid can be accelerated.

[0030] It should be noted that in the embodiments of the present invention, after the feed liquid with a higher concentration is cooled, its supersaturation will increase, and thus a large amount of solute crystals will precipitate. In this way, the crystals can be discharged through the solid-liquid separation device.

[0031] As shown Figure 1 in the figure, an embodiment of the present invention provides an evaporation crystallization device. The evaporation crystallization device includes an air circulation system 10, a liquid circulation system 40, and a heat pump system 20. Among them, the air circulation system 10 includes a circulation air duct 1 and a fan 18 located in the circulation air duct 1; the liquid circulation system 40 includes a liquid storage tank 110 for storing liquid, a first liquid delivery pipeline 41 communicated with the liquid storage tank 110, and a power pump 12 located on the first liquid delivery pipeline 41. The liquid storage tank 110 is communicated with the circulation air duct 1, and the inlet end of the first liquid delivery pipeline is communicated with the liquid storage tank. The outlet end of the first liquid delivery pipeline 41 is communicated with the circulation air duct 1. The air flow in the circulation air duct 1 contacts the liquid output from the outlet end of the first liquid delivery pipeline 41 to form wet air; the heat pump system 20 includes a circulation loop 2 and a compressor 21, a switching device 22, a heat exchanger 23, an expansion valve 25, and an evaporator 27 sequentially arranged on the circulation loop 2. The evaporator 27 is located in the circulation air duct 1. The wet air is cooled by the evaporator 27 to precipitate condensed water. The heat exchanger 23 is used for heat exchange of the liquid in the first liquid delivery pipeline 41. The heat pump system 20 further includes a condenser 29 arranged in parallel with the evaporator 27, so that the heat exchanger 23 can provide the heat required for evaporation and concentration of the liquid or the cold required for cooling crystallization.

[0032] In the above technical solution, by setting the air circulation system 10, the liquid circulation system 40, and the heat pump system 20, the heat exchanger 23 of the heat pump system 20 can be used to heat the liquid, and then the circulating air flow is made to contact the heated liquid to take away the water in the liquid and form wet air. Then, the evaporator 27 of the heat pump system 20 is used to cool the wet air and precipitate condensed water from the wet air. The dehumidified air flow can contact the liquid again. In this way, through multiple cycles of the air flow, the liquid can be continuously concentrated; after the liquid is concentrated, the switching device 22 can be used to change the flow direction of the medium in the circulation loop, so that the heat exchanger 23 can cool the concentrated liquid, and the power pump 12 can be used to make the liquid circulate between the first liquid delivery pipeline 41 and the liquid storage tank 110, so that the concentrated liquid is continuously cooled and crystallized. Using the above evaporation crystallization device to first evaporate and concentrate the liquid, and then cool and lower the temperature of the liquid, the crystallization efficiency of the liquid can be effectively improved.

[0033] It should be noted that in the embodiment of the present invention, when the liquid reaches the preset concentration, cooling crystallization can be carried out.

[0034] Specifically, in the embodiment of the present invention, the liquid flows through the power pump 12 and the first liquid delivery pipeline 41 to the outlet end of the first liquid delivery pipeline 41, and then the liquid flows from the above outlet end to the circulation air duct 1 and flows through the circulation air duct 1 to the liquid storage tank 110. In this way, a circulation of the liquid can be formed.

[0035] Specifically, in the embodiments of the present invention, when the liquid material is in the evaporation and concentration stage, the high-temperature and high-pressure refrigerant gas generated by the compressor 21 flows into the heat exchanger 23 and liquefies. In this way, the first liquid delivery pipeline 41 provided with the heat exchanger 23 can be heated. Then, the liquefied refrigerant flows into the evaporator 27 and evaporates. In this way, the humid air in the air duct can be cooled, so that the humid air condenses to precipitate condensed water and the condensed water is discharged from the circulation air duct 1, thereby realizing the concentration of the liquid material; when the liquid material is in the cooling and crystallization stage, the high-temperature and high-pressure refrigerant gas generated by the compressor 21 flows into the condenser 29 and liquefies to form a liquid refrigerant. Then, the liquid refrigerant flows into the heat exchanger 23 and evaporates. In this way, the heat exchanger 23 can cool the first liquid delivery pipeline 41. In this way, the concentrated liquid material can be cooled to realize cooling and crystallization.

[0036] Specifically, in the embodiments of the present invention, the heat pump system 20 further includes an evaporation solenoid valve 26 and a condensation solenoid valve 28 both arranged in the circulation loop 2. The evaporation solenoid valve 26 is located between the evaporator 27 and the expansion valve 25, and the condensation solenoid valve 28 is located between the condenser 29 and the expansion valve 25. When it is necessary to evaporate and concentrate the liquid material, the condensation solenoid valve 28 is closed and the evaporation solenoid valve 26 is opened. When it is necessary to cool the liquid material, the evaporation solenoid valve 26 is closed and the condensation solenoid valve 28 is opened.

[0037] Preferably, in the embodiments of the present invention, the evaporator 27 is a finned surface cooler.

[0038] Preferably, in the embodiments of the present invention, the condenser 29 is an air-cooled finned heat exchanger.

[0039] Preferably, in the embodiments of the present invention, the power pump 12 is a crystal slurry pump.

[0040] As Figure 1 shown, in the embodiments of the present invention, the circulation air duct 1 is located above the liquid storage tank 110, so that the air flow in the circulation air duct 1 contacts the liquid material output from the outlet end of the first liquid delivery pipeline 41 in a countercurrent manner.

[0041] Through the above settings, the liquid material flows out from the outlet end of the first liquid delivery pipeline 41 and flows from top to bottom to the liquid storage tank 110 in Figure 1 and the air flow in Figure 1 circulates clockwise in the circulation air duct 1. In this way, the air flow flows from bottom to top on the left side of the air duct in Figure 1 so that the air flow and the liquid material can contact countercurrently in the circulation air duct 1, so that the air flow can effectively take away the moisture in the liquid material to form humid air with a relatively high humidity. In this way, the concentration efficiency of the liquid material can be improved.

[0042] As Figure 1 shown, in an embodiment of the present invention, the evaporation crystallization device further includes a baffle 16 disposed in the circulation air duct 1. The baffle 16 is located between the outlet end of the first liquid delivery pipeline 41 and the liquid storage tank 110. A plurality of through holes for the airflow to pass through are arranged at intervals on the baffle 16.

[0043] Through the above arrangement, the liquid material flowing out from the outlet end of the first liquid delivery pipeline 41 can flow through the baffle 16 to the liquid storage tank 110. The airflow in the circulation air duct 1 enters the through holes from the side of the baffle 16 facing away from the outlet end of the first liquid delivery pipeline 41 and contacts the liquid material in a countercurrent manner, and performs bubbling heat and mass transfer in the through holes to take away the moisture in the liquid material. In this way, the liquid material and the airflow can be in more sufficient contact, thereby forming saturated air.

[0044] Preferably, in an embodiment of the present invention, the baffle 16 is a sieve plate, and a plurality of sieve holes are provided on the sieve plate. Since the diameter of the sieve holes is relatively large, using the sieve plate as the medium for heat and mass transfer between air and liquid material can improve the heat transfer efficiency and prevent crystal blockage of the sieve holes.

[0045] As Figure 1 shown, in an embodiment of the present invention, along the vertical direction, the evaporation crystallization device includes a plurality of baffles 16 arranged at intervals in the vertical direction.

[0046] Through the above arrangement, the contact area between the liquid material and the airflow can be increased, so that the liquid material and the airflow can be in more sufficient contact. In this way, saturated air can be formed more effectively.

[0047] As Figure 1 shown, in an embodiment of the present invention, the evaporation crystallization device further includes a buffer plate 15 located in the circulation air duct 1. The buffer plate 15 is disposed between the baffle 16 and the liquid storage tank 110.

[0048] In the above technical solution, by providing the buffer plate 15, it is possible to prevent the liquid material from splashing when flowing from the baffle 16 to the liquid storage tank 110.

[0049] As Figure 1 shown, in an embodiment of the present invention, the air circulation system 10 further includes a first air duct housing 101 and a second air duct housing 102 connected to the first air duct housing 101. The interiors of the first air duct housing 101 and the second air duct housing 102 form a circulation air duct 1. The baffle 16 and the buffer plate 15 are located in the first air duct housing 101, and the fan 18 is located in the second air duct housing 102.

[0050] With the above settings, a circulation air duct 1 can be formed inside the first air duct housing 101 and inside the second air duct housing 102. In this way, the air flow can circulate inside the circulation air duct 1. And by setting the first air duct housing 101 and the second air duct housing 102, the deflector plate 16 and the buffer plate 15 can be arranged Figure 1 on the left side of the circulation air duct 1 in Figure 1 , and the fan 18 can also be arranged

[0051] on the right side of the circulation air duct 1 in Figure 1 . Specifically, in the embodiment of the present invention, the first air duct housing 101 is located Figure 1 on the left side in

[0052] such as Figure 1 shown. In the embodiment of the present invention, one end of a part of the plurality of deflector plates 16 is connected to the first side wall of the first air duct housing 101, and there is a gap between the other end of the above-mentioned part of the deflector plates 16 and the second side wall of the first air duct housing 101; one end of another part of the plurality of deflector plates 16 is connected to the second side wall of the first air duct housing 101, and there is a gap between the other end of the above-mentioned another part of the deflector plates 16 and the first side wall of the first air duct housing 101. In this way, a bending loop can be formed, so that the walking path of the liquid material can be increased, and further the contact area between the liquid material and the air flow can be increased. In this way, the efficiency of the air flow taking away the moisture in the liquid material can be improved.

[0053] such as Figure 1 shown. In the embodiment of the present invention, the evaporation crystallization device further includes a liquid blocking part 17 located inside the circulation air duct 1, and the liquid blocking part 17 is located between the outlet end of the first liquid delivery pipeline 41 and the evaporator 27.

[0054] With the above settings, the wet air first passes through the liquid blocking part 17 and is filtered by the liquid blocking part 17 and then flows to the side where the evaporator 27 is located. In this way, the liquid blocking part 17 can prevent the wet air from bringing the liquid material to the side where the evaporator 27 is located, so as to avoid taking out the liquid material.

[0055] Preferably, in the embodiment of the present invention, the liquid blocking part 17 can be a demister or a liquid baffle, etc.

[0056] such as Figure 1 shown. In the embodiment of the present invention, the heat pump system 20 further includes a heat dissipation part 24 located on the circulation loop 2, and the heat dissipation part 24 is located between the expansion valve 25 and the heat exchanger 23.

[0057] With the above settings, the heat dissipation part 24 can remove the excess heat generated during the evaporation and concentration stage of the liquid material, so as to maintain the temperature of the liquid material and prevent the heat pump system from being protected by high pressure due to too high a condensation temperature.

[0058] Specifically, in the embodiments of the present invention, the rotational speed of the fan of the heat dissipation part 24 can be controlled according to the temperature of the liquid material to adjust the heat dissipation amount.

[0059] Preferably, in the embodiments of the present invention, the heat dissipation part 24 is a variable-frequency air-cooled finned surface cooler.

[0060] As Figure 1 shown, in the embodiments of the present invention, the switching device 22 is a four-way valve. The four-way valve has a first port, a second port, a third port, and a fourth port. The first port is communicated with the outlet of the compressor 21, the third port is communicated with the inlet of the compressor 21, the second port is communicated with the heat exchanger 23, and the fourth port is communicated with the evaporator 27 or the condenser 29.

[0061] In the above technical solution, when the liquid material is in the evaporation and concentration stage, the first port is communicated with the second port, the fourth port is communicated with the evaporator 27, and the fourth port is communicated with the third port. In this way, the high-temperature and high-pressure gas generated by the compressor 21 can sequentially pass through the first port, the second port, the heat exchanger 23, the heat dissipation part 24, the evaporator 27, the fourth port, and the third port, and thus return to the compressor 21. In this way, the circulation of the medium in the heat pump system 20 can be realized when the liquid material is in the evaporation and concentration stage; when the liquid material is in the cooling and crystallization stage, the first port and the fourth port are communicated, the second port and the third port are communicated, and the fourth port is communicated with the condenser 29. In this way, the high-temperature and high-pressure gas generated by the compressor 21 can pass through the first port, the fourth port, the condenser 29, the heat dissipation part 24, the heat exchanger 23, the second port, and the third port in sequence and then return to the compressor 21. In this way, the circulation of the medium in the heat pump system 20 can be realized when the liquid material is in the cooling and crystallization stage. In this way, the heat exchanger 23 can be controlled to be in a heating state or a cooling state, so that the liquid material can be evaporated and concentrated, and can also be cooled and crystallized, thereby improving the crystallization efficiency of the liquid material.

[0062] As Figure 1 shown, in the embodiments of the present invention, the first liquid delivery pipeline 41 includes a first pipe section 411 and a second pipe section 412 that are connected and communicated, and a first electromagnetic valve 13 located on the second pipe section 412. The power pump 12 and the heat exchanger 23 are located on the first pipe section 411. The second pipe section 412 is communicated with the circulation air duct 1. The liquid material circulation system 40 further includes a second liquid delivery pipeline 42 and a second electromagnetic valve 14 located on the second liquid delivery pipeline 42. One end of the second liquid delivery pipeline 42 is communicated with the second pipe section 412, and the other end of the second liquid delivery pipeline 42 is communicated with the liquid storage tank 110.

[0063] With the above settings, when the liquid material is in the evaporation and concentration stage, the liquid material in the liquid storage tank 110 is transported to the circulating air duct 1 through the first liquid delivery pipeline 41. When the liquid material is in the cooling and crystallization stage, the liquid material in the liquid storage tank 110 is transported to the circulating air duct 1 through the first pipe section 411, part of the second pipe section 412, and the second liquid delivery pipeline 42, and flows from the circulating air duct 1 to the liquid storage tank 110. This can prevent the concentrated and cooled liquid material from passing through the guide plate 16, thereby avoiding blockage of the guide plate 16.

[0064] As Figure 1 shown, in the embodiment of the present invention, the evaporation and crystallization device further includes a liquid discharge system 30. The liquid discharge system 30 includes a liquid outlet pipeline communicated with the power pump 12, and a liquid outlet solenoid valve 31 and a solid-liquid separation device 32 both arranged on the liquid outlet pipeline. The solid-liquid separation device 32 is used to separate the crystal 34 and the clear liquid 33 formed by the liquid material through cooling and crystallization.

[0065] In the above technical solution, after the liquid material is cooled into a thick slurry, the heat pump system 20 is turned off, and then the liquid outlet solenoid valve 31 is opened. The slurry is discharged into the solid-liquid separation device 32 by using the power pump 12. In this way, the crystal and the clear liquid 33 in the slurry can be separated, and the crystal can be discharged, and the clear liquid 33 can be returned to the original liquid tank.

[0066] Preferably, in the embodiment of the present invention, the solid-liquid separation device 32 can be equipment such as a centrifuge, a filter, or a sedimentation tank.

[0067] As Figure 1 shown, in the embodiment of the present invention, the evaporation and crystallization device further includes a water inlet, a water replenishing pipeline communicated with the water inlet, and a water inlet solenoid valve 19 located between the water inlet and the water replenishing pipeline. The water inlet is communicated with the liquid storage tank 110.

[0068] Preferably, in the embodiment of the present invention, the water replenishing pipeline is a tap water replenishing pipeline.

[0069] In the above technical solution, after the solid-liquid separation is completed and the crystal and the clear liquid 33 are discharged, the water inlet solenoid valve 19 can be opened to replenish water into the liquid storage tank 110, and all the valves of the evaporation and crystallization device are opened, and the power pump is started to flush the first liquid delivery pipeline 41, the second liquid delivery pipeline 42, and the circulating air duct 1 with circulating water to prevent crystal deposition and scaling.

[0070] Specifically, in the embodiment of the present invention, the evaporation and crystallization device further includes a feed pipeline communicated with the liquid storage tank 110 and a feed solenoid valve 11 located on the feed pipeline. In this way, the liquid storage tank 110 can be fed through the feed pipeline.

[0071] As Figure 2As shown in the figure, an embodiment of the present invention provides a method for evaporating and treating a liquid material. The method for evaporating and treating the liquid material uses the above-mentioned evaporation crystallization equipment to treat the liquid material. The above-mentioned method for evaporating and treating the liquid material has all the advantages of the above-mentioned evaporation crystallization equipment, which will not be elaborated here.

[0072] As Figure 2 shown in the figure, in an embodiment of the present invention, the method for evaporating and treating the liquid material includes a concentration step of removing water from the liquid material by using the circulating air flow in the circulating air duct 1 and a cooling crystallization step of cooling and crystallizing the concentrated liquid material by using the heat exchanger 23.

[0073] In the above technical solution, the moisture in the liquid material is taken away by the circulating air flow and dehumidified, and the dehumidified air flow can contact the liquid material again. In this way, through multiple cycles of the air flow, the liquid material can be continuously concentrated; after the liquid material is concentrated, the heat exchanger 23 can be used to cool the concentrated liquid material, and the power pump 12 can be used to circulate the liquid material between the first liquid delivery pipeline 41 and the liquid storage tank 110, so as to continuously cool and crystallize the concentrated liquid material. By using the above method for evaporating and treating the liquid material, the liquid material is first evaporated and concentrated, and then cooled, so that the crystallization efficiency of the liquid material can be effectively improved.

[0074] As Figure 2 shown in the figure, in an embodiment of the present invention, before the concentration step, the method for evaporating and treating the liquid material further includes a heating step of heating the liquid material by using the heat exchanger 23.

[0075] In the above technical solution, the heat exchanger 23 is used to heat the liquid material, so that the temperature of the liquid material can be increased, and the circulating air flow can more easily take away the moisture in the liquid material to concentrate the liquid material.

[0076] As Figure 2 shown in the figure, in an embodiment of the present invention, after the cooling crystallization step, the method for evaporating and treating the liquid material further includes a solid-liquid separation step of separating the crystals 34 and the clear liquid 33 formed by the liquid material.

[0077] In the above technical solution, after the liquid material is cooled into a thick slurry, the solid-liquid separation device 32 can be used to separate the crystals 34 and the clear liquid in the slurry, and the crystals 34 are discharged, and the clear liquid is returned to the original liquid tank. In this way, the treatment of the wastewater is completed.

[0078] As Figure 3 shown in the figure, in an embodiment of the present invention, the concentration step includes a water removal step of counter-current contact between the circulating air flow and the liquid material to absorb the moisture in the liquid material and a condensation step of cooling the air with moisture by using the evaporator 27 to precipitate condensed water.

[0079] In the above technical solution, the circulating air flow is in countercurrent contact with the liquid material, so that the moisture in the liquid material can be carried away to form wet air. Then, the wet air is cooled by the evaporator 27 and condensed water is separated out from the wet air. The dehumidified air flow can be in contact with the liquid material again. In this way, through multiple cycles of the air flow, the liquid material can be continuously concentrated.

[0080] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: By setting up an air circulation system, a liquid material circulation system and a heat pump system, the heat exchanger of the heat pump system can be used to heat the liquid material, and then the circulating air flow is in contact with the heated liquid material to carry away the moisture in the liquid material and form wet air. Then, the evaporator of the heat pump system is used to cool the wet air and separate out condensed water from the wet air. In this way, through multiple cycles of the air flow, the liquid material can be evaporated and concentrated; after the liquid material is concentrated, the switching device can be used to change the flow direction of the medium in the circulation loop so that the heat exchanger can cool the concentrated liquid material, thereby cooling and crystallizing the concentrated liquid material. By using the above evaporation and crystallization equipment to first evaporate and concentrate the liquid material and then cool down the liquid material, the crystallization efficiency of the liquid material can be effectively improved.

[0081] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An evaporation crystallization device, characterized in that, it includes: An air circulation system (10), including a circulation air duct (1) and a fan (18) located in the circulation air duct (1); A liquid material circulation system (40), including a liquid storage tank (110) for storing liquid material, a first liquid delivery pipeline (41), and a power pump (12) located on the first liquid delivery pipeline (41). The liquid storage tank (110) is communicated with the circulation air duct (1), and the inlet end of the first liquid delivery pipeline (41) is communicated with the liquid storage tank (110). The outlet end of the first liquid delivery pipeline (41) is communicated with the circulation air duct (1). The air flow in the circulation air duct (1) contacts the liquid material output from the outlet end of the first liquid delivery pipeline (41) to form wet air; A heat pump system (20), including a circulation loop (2) and a compressor (21), a switching device (22), a heat exchanger (23), an expansion valve (25), and an evaporator (27) sequentially arranged on the circulation loop (2). The evaporator (27) is located in the circulation air duct (1). The wet air is cooled by the evaporator (27) to precipitate condensed water. The heat exchanger (23) is used for heat exchange of the liquid material located in the first liquid delivery pipeline (41). The heat pump system (20) further includes a condenser (29) arranged in parallel with the evaporator (27) so that the heat exchanger (23) can provide the heat required for evaporation and concentration of the liquid material or the cold required for cooling and crystallization; The evaporation crystallization device further includes a liquid blocking part (17) located in the circulation air duct (1), and the liquid blocking part (17) is located between the outlet end of the first liquid delivery pipeline (41) and the evaporator (27); The first liquid delivery pipeline (41) includes a first pipe section (411) and a second pipe section (412) that are communicated with each other, and a first solenoid valve (13) located on the second pipe section (412). The power pump (12) and the heat exchanger (23) are located on the first pipe section (411). The second pipe section (412) is communicated with the circulation air duct (1). The liquid material circulation system (40) further includes a second liquid delivery pipeline (42) and a second solenoid valve (14) located on the second liquid delivery pipeline (42). One end of the second liquid delivery pipeline (42) is communicated with the second pipe section (412), and the other end of the second liquid delivery pipeline (42) is communicated with the liquid storage tank (110); or, The evaporation crystallization device further includes a water inlet, a makeup water pipeline communicated with the water inlet, and a water inlet solenoid valve (19) located between the water inlet and the makeup water pipeline. The water inlet is communicated with the liquid storage tank (110).

2. The evaporation crystallization device according to claim 1, characterized in that, The circulation air duct (1) is located above the liquid storage tank (110) so that the air flow in the circulation air duct (1) contacts the liquid material output from the outlet end of the first liquid delivery pipeline (41) in a countercurrent manner.

3. The evaporation crystallization device according to claim 1, characterized in that, The evaporation crystallization device further includes a flow guide plate (16) disposed in the circulation air duct (1). The flow guide plate (16) is located between the outlet end of the first liquid delivery pipeline (41) and the liquid storage tank (110). A plurality of through holes which are arranged at intervals and for the air flow to pass through are provided on the flow guide plate (16).

4. The evaporation crystallization device according to claim 3, wherein, In the vertical direction, the evaporation crystallization device includes a plurality of flow guide plates (16) arranged at intervals in the vertical direction.

5. The evaporation crystallization device according to claim 3, wherein, The evaporation crystallization device further includes a buffer plate (15) located in the circulation air duct (1). The buffer plate (15) is arranged between the flow guide plate (16) and the liquid storage tank (110).

6. The evaporation crystallization device according to claim 5, wherein, The air circulation system (10) further includes a first air duct housing (101) and a second air duct housing (102) connected to the first air duct housing (101). The interiors of the first air duct housing (101) and the second air duct housing (102) form the circulation air duct (1). The flow guide plate (16) and the buffer plate (15) are located in the first air duct housing (101), and the fan (18) is located in the second air duct housing (102).

7. The evaporation crystallization device according to any one of claims 1 to 6, wherein, The heat pump system (20) further includes a heat dissipation part (24) located on the circulation loop (2). The heat dissipation part (24) is located between the expansion valve (25) and the heat exchanger (23).

8. The evaporation crystallization device according to any one of claims 1 to 6, wherein, The switching device (22) is a four-way valve. The four-way valve has a first port, a second port, a third port, and a fourth port. The first port is communicated with the outlet of the compressor (21), the third port is communicated with the inlet of the compressor (21), the second port is communicated with the heat exchanger (23), and the fourth port is communicated with the evaporator (27) or the condenser (29).

9. A method for evaporating and treating a liquid material, wherein, The method for evaporating and treating the liquid material uses the evaporation crystallization device according to any one of claims 1 to 8 to treat the liquid material.

10. The method for evaporating and treating a liquid material according to claim 9, wherein, The method for evaporating and treating the liquid material includes: A concentration step of removing water and concentrating the liquid material by using the circulating air flow in the circulation air duct (1); A cooling crystallization step of cooling and crystallizing the concentrated liquid material by using the heat exchanger (23).

11. The method for evaporating and treating a liquid material according to claim 10, wherein, Before the concentration step, the evaporation treatment method of the feed liquid further includes a heating step of heating the feed liquid by using the heat exchanger (23); or, after the cooling crystallization step, the evaporation treatment method of the feed liquid further includes a solid-liquid separation step of separating the crystals (34) and the supernatant liquid (33) formed by the feed liquid.

12. The evaporation treatment method of the feed liquid according to claim 10, wherein, the concentration step includes: a water removal step in which the circulating air flow is in countercurrent contact with the feed liquid to absorb the moisture in the feed liquid; a condensation step of cooling the air with the moisture by using the evaporator (27) to precipitate condensed water.

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