Ammonium chloride wastewater crystallization and evaporation device

Abstract

The utility model discloses an ammonium chloride waste water crystallization and evaporation device, which comprises a steam circulation loop provided with a separator, a heater and a circulating pump; the discharging pipeline is communicated with the steam circulation loop; the crystallization kettle is communicated with the discharging pipeline; the secondary steam condensation mechanism is communicated with the separator through a steam pipeline; the feeding pipeline is communicated with the separator, a feeding pump is arranged on the feeding pipeline, and a spraying mechanism is arranged between the feeding pipeline and the separator. According to the utility model, through the spraying mechanism, ammonium chloride wastewater can enter the separator in a more uniform and fine liquid drop form, the spraying mode is beneficial to increasing the contact area between the wastewater and hot steam and improving the heat exchange efficiency, and the spraying mechanism can replace or reduce the spraying of tap water or condensed water for inhibiting the foaming of materials in the traditional process. The to-be-treated ammonium chloride wastewater is directly utilized by the spraying mechanism, so that the problem that the operation cost is increased due to the fact that external water enters the system is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of evaporation systems, and in particular to an ammonium chloride wastewater crystallization evaporation device. Background Technology

[0002] Ammonium chloride wastewater, an industrial wastewater containing ammonium chloride, is generated in large quantities in various fields such as new energy battery manufacturing, fertilizer production, and rare earth industry. With the rapid development of the new energy industry, the discharge of ammonium chloride wastewater has also increased, posing a serious challenge to environmental protection. Direct discharge of ammonium chloride wastewater will severely pollute water bodies; therefore, appropriate pretreatment and post-treatment are necessary to ensure that the wastewater meets discharge standards or achieves effective resource utilization. Traditional ammonium chloride wastewater treatment processes include a series of pretreatment steps, such as water quality adjustment and suspended solids removal, after which the wastewater enters an evaporation crystallization system for treatment. Evaporation crystallization is a key step in ammonium chloride wastewater treatment; through evaporation and concentration, the wastewater reaches a saturated state, thereby precipitating ammonium chloride crystals. These crystals can be used as fertilizer raw materials, achieving resource recycling.

[0003] However, the evaporation and crystallization process of ammonium chloride wastewater faces numerous technical challenges. First, ammonium chloride readily decomposes into ammonia and hydrogen chloride at high temperatures, which not only affects the efficiency of evaporation and crystallization but can also corrode equipment. Therefore, traditional evaporation systems typically employ vacuum evaporation technology to lower the boiling point of the wastewater and reduce ammonium chloride decomposition. Nevertheless, ammonium chloride decomposition under high-temperature conditions is still difficult to completely avoid. Second, ammonium chloride wastewater usually contains a certain amount of organic matter and other impurities. As the evaporation process proceeds, these organic substances and impurities accumulate in the solution, causing the material to easily foam. This foaming phenomenon not only affects the stable operation of the evaporation system but may also cause the material to flow through pipelines to downstream processes, resulting in corrosion damage to downstream equipment and deterioration of the steam condensate quality.

[0004] To address these issues, existing processes employ various measures. For example, a scrubbing tower is added at the downstream end of the evaporation system to remove ammonia and hydrogen chloride entrained in the secondary steam; tap water or condensate spraying is added to the separator to suppress material foaming; and the height of the separator is increased to extend the residence time of the material and improve separation efficiency. However, these measures also have limitations. For instance, increasing the separator height increases equipment investment costs; tap water or condensate spraying can only be activated in emergency situations, and the introduction of external water increases operating costs; and the scrubbing tower requires frequent water replacement when material loss is severe, generating secondary wastewater. Utility Model Content

[0005] In order to overcome at least one of the defects described in the prior art, the present invention provides an ammonium chloride wastewater crystallization evaporation device.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] An ammonium chloride wastewater crystallization evaporation device includes: a steam circulation loop equipped with a separator, a heater, and a circulation pump; a discharge pipe connected to the steam circulation loop; a crystallization vessel connected to the discharge pipe; a secondary steam condensation mechanism connected to the separator via a steam pipe; and a feed pipe connected to the separator, equipped with a feed pump, and a spray mechanism between the feed pipe and the separator.

[0008] By adopting the above scheme, the ammonium chloride wastewater can enter the separator in a more uniform and finer droplet form through the spraying mechanism. This spraying method helps to increase the contact area between the wastewater and the hot steam, improving heat exchange efficiency. The spraying mechanism can replace or reduce the use of tap water or condensate spraying to suppress foaming of materials in traditional processes. Since the spraying mechanism directly utilizes the ammonium chloride wastewater to be treated, it avoids the problem of increased operating costs caused by external water entering the system.

[0009] Furthermore, the spraying mechanism includes: a main spraying pipe, which is connected to the feed pipe; a branch spraying pipe, one end of which is connected to the main spraying pipe and the other end is provided with a sealing cap, which is fixed to the inner wall of the separator, and the portion of the branch spraying pipe that passes through the separator is provided with a sealing valve; and spray nozzles, which are disposed on the portion of the branch spraying pipe located inside the separator.

[0010] By adopting the above scheme, a sealing valve is installed on the part of the spray branch pipe that passes through the separator. This not only ensures the sealing of the system, but also facilitates the maintenance and troubleshooting of the spray mechanism when needed. The sealing cover is fixed on the inner wall of the separator, ensuring the stability and reliability of the spray branch pipe, while blocking the spray branch pipe so that it can only spray out from the spray nozzle.

[0011] Furthermore, the main spray pipe is connected to multiple spray branch pipes, and the sequential connection between the sealing caps and sealing valves on the multiple spray branch pipes is circular to fit the inner wall of the separator.

[0012] By adopting the above scheme, the circular layout can ensure that the wastewater is evenly distributed inside the columnar separator, avoiding situations where there is too much or too little wastewater in certain areas, thereby improving the uniformity and efficiency of evaporation and crystallization.

[0013] Furthermore, the spray branch pipe is provided with multiple spray nozzles, all of which face directly below the separator.

[0014] By adopting the above scheme, with the spray nozzles facing directly below the separator, it can be ensured that wastewater droplets can directly and evenly cover the bottom and lower side walls of the separator, thereby improving the contact area between wastewater and steam and the evaporation efficiency.

[0015] Furthermore, a manual valve is provided between the main spray pipe and the branch spray pipe, and the manual valve is located at the end of the branch spray pipe near the main spray pipe.

[0016] By adopting the above solution, the addition of manual valves allows operators to flexibly control the flow rate of each sprinkler branch pipe.

[0017] Furthermore, a preheating mechanism is also provided on the feed pipe.

[0018] By adopting the above scheme, the preheating unit can preheat the ammonium chloride wastewater to be treated, so that it reaches a certain temperature before entering the evaporation system, which helps to reduce the energy consumption of the wastewater during the evaporation process.

[0019] Furthermore, the preheating mechanism includes at least one pipe heater, the pipe heater comprising: a heater outer shell, the heater outer shell being cylindrical and having an outer shell connecting lip plate at its edge; a heater inner shell, the heater inner shell being cylindrical and having an inner shell connecting lip plate at its edge, the heater outer shell and the heater inner shell being coaxially arranged, the heater inner shell being sleeved on the feed pipe; a support frame, the support frame being supported between the heater outer shell and the heater inner shell, so that an annular cavity is formed between the heater outer shell and the heater inner shell; and a heating element, the heating element being disposed within the annular cavity.

[0020] By adopting the above scheme, the pipeline heater generates heat in the annular cavity through the heating element. This heat can be quickly transferred to the ammonium chloride wastewater in the feed pipeline, so that it reaches the required preheating temperature in a short time. The high efficiency of the heating element ensures the speed and stability of the preheating process, thereby improving the processing efficiency of the entire evaporation crystallization device.

[0021] Furthermore, the heating element includes: an electric heating wire, which is wrapped around the annular cavity; and a plurality of plate fins, which are arranged sequentially at intervals along the electric heating wire.

[0022] By adopting the above-described scheme, the plate-fin design helps to reduce heat loss. The plate-fin not only provides heating functionality but also enhances the structural strength of the pipe heater.

[0023] Furthermore, a demister is installed inside the separator, and the steam pipe is connected to the demister.

[0024] By adopting the above scheme, the main function of the demister is to capture and remove tiny droplets or fumes entrained in the steam.

[0025] Furthermore, a return pipe is provided between the separator and the steam pipe, and the return pipe is equipped with a material leakage prevention device.

[0026] By adopting the above scheme, some of the liquid in the separator can be returned to the original treatment system to avoid the loss of valuable materials with the steam.

[0027] In summary, the ammonium chloride wastewater crystallization and evaporation device provided by this utility model has the following technical effects:

[0028] 1. The spraying mechanism injects ammonium chloride wastewater into the separator in the form of more uniform and fine droplets. This spraying method significantly increases the contact area between the wastewater and the hot steam, thereby improving the heat exchange efficiency. This means that more wastewater can be treated or a higher evaporation efficiency can be achieved with the same energy consumption.

[0029] 2. The spraying mechanism effectively reduces foaming caused by the accumulation of organic matter and impurities during the evaporation process by uniformly spraying wastewater. This helps maintain the stable operation of the evaporation system, prevents materials from flowing into downstream processes through pipelines, and thus avoids corrosion damage to downstream equipment and deterioration of steam condensate quality.

[0030] 3. The spraying system directly utilizes the ammonium chloride wastewater to be treated, eliminating the need for tap water or condensate water in traditional processes. This not only reduces the use of external water but also lowers the operating costs associated with treating external water.

[0031] 4. By optimizing the structural design and operating procedures of the evaporation system, the device enhances system stability. The coordinated operation of components such as the spray mechanism, separator, heater, and circulating pump ensures the continuity and stability of the wastewater treatment process, improving the reliability and durability of the entire system. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the device connection structure according to an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of the spray mechanism structure according to an embodiment of the present utility model;

[0034] Figure 3 This is a schematic diagram of the preheating mechanism structure according to an embodiment of the present utility model;

[0035] Figure 4 This is a schematic diagram of the pipe heater structure according to an embodiment of the present utility model.

[0036] The meanings of the reference numerals in the attached drawings are as follows: 1. Steam circulation loop; 11. Separator; 12. Heater; 13. Circulation pump; 2. Discharge pipe; 21. Discharge pump; 22. Discharge regulating valve; 3. Crystallizer; 4. Secondary steam condensation mechanism; 41. Vacuum pump; 42. Secondary steam condenser; 5. Feed pipe; 51. Feed pump; 6. Spraying mechanism; 61. Main spray pipe; 62. Branch spray pipe; 621. Sealing cover; 62 2. Sealing valve; 63. Spray nozzle; 64. Manual valve; 7. Preheating mechanism; 8. Pipeline heater; 81. Heater housing; 811. Housing connecting lip plate; 82. Heater inner housing; 821. Inner housing connecting lip plate; 83. Support frame; 84. Annular cavity; 85. Heating element; 851. Electric heating wire; 852. Plate fin; 9. Demister; 10. Return pipe; 101. Anti-material leakage device; 102. U-shaped water seal pipe. Detailed Implementation

[0037] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the protection scope of this invention.

[0038] To facilitate understanding of the embodiments of this utility model, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] See Embodiment 1 of this utility model. Figures 1-4As shown, an ammonium chloride wastewater crystallization and evaporation device is disclosed, including a steam circulation loop 1, a discharge pipe 2, a crystallization kettle 3, a secondary steam condensation mechanism 4, and a feed pipe 5. The steam circulation loop 1 is equipped with a separator 11, a heater 12, and a circulation pump 13. The discharge pipe 2 is connected to the steam circulation loop 1, and the crystallization kettle 3 is connected to the discharge pipe 2. The discharge pipe 2 is equipped with a discharge pump 21 and a discharge regulating valve 22. The secondary steam condensation mechanism 4 is connected to the separator 11 through a steam pipe. Preferably, the secondary steam condensation mechanism 4 includes a vacuum pump 41 and a secondary steam condenser. The vacuum pump 41 is used to pump gas to the secondary steam condenser. The gas then enters the separator 11 through the steam pipe. The gas includes ammonia and hydrogen chloride. The feed pipe 5 is connected to the separator 11. A feed pump 51 is installed on the feed pipe 5, and a spray mechanism 6 is installed between the feed pipe 5 and the separator 11. Through the spray mechanism 6, the ammonium chloride wastewater can enter the separator 11 in a more uniform and fine droplet form to react with ammonia and hydrogen chloride, thereby absorbing ammonia and hydrogen chloride. This spraying method helps to increase the contact area between the wastewater and the hot steam, improving the heat exchange efficiency. The spray mechanism 6 can replace or reduce the use of tap water or condensate spraying in traditional processes to suppress foaming of materials. Since the spray mechanism 6 directly utilizes the ammonium chloride wastewater to be treated, it avoids the problem of increased operating costs caused by external water entering the system.

[0042] In some specific embodiments, the spraying mechanism 6 includes a main spray pipe 61, a branch spray pipe 62, and spray nozzles 63. The spray nozzles 63 are located within the separator 11 on the portion of the branch spray pipe 62. Multiple spray nozzles 63 are provided on the branch spray pipe 62, preferably all facing directly below the separator 11. This ensures that wastewater droplets can directly and evenly cover the bottom and lower sidewalls of the separator 11, thereby increasing the contact area between wastewater and steam and improving evaporation efficiency. The downward spraying of wastewater by the spray nozzles 63 creates a downward water flow, which helps promote the flow and distribution of steam within the separator 11. During its ascent, the steam exchanges heat with the wastewater droplets, accelerating the evaporation rate. Simultaneously, the steam flow also helps carry away the evaporated ammonium chloride crystals, preventing crystal accumulation within the separator 11. The main spray pipe 61 is connected to the feed pipe 5. Multiple spray branch pipes 62 are connected to the main spray pipe 61. One end of each spray branch pipe 62 is connected to the main spray pipe 61, and the other end is equipped with a sealing cap 621 to seal the other end of the spray branch pipe 62. The sealing cap 621 is fixed to the inner wall of the separator 11, ensuring the stability and reliability of the spray branch pipes 62 and simultaneously sealing them so that they can only spray from the spray nozzles 63. A sealing valve 622 is provided on the portion of the spray branch pipe 62 that passes through the separator 11. This not only ensures the system's sealing but also facilitates maintenance and troubleshooting of the spray mechanism 6 when needed.

[0043] Preferably, the sequential connection between the sealing caps 621 and sealing valves 622 on the multiple spray branch pipes 62 is circular to fit the inner wall of the separator 11. The circular layout ensures that the wastewater is evenly distributed inside the columnar separator 11, avoiding situations where there is too much or too little wastewater in certain areas, thereby improving the uniformity and efficiency of evaporation and crystallization. The wastewater can contact the steam in the separator 11 in a more uniform manner, increasing the heat exchange area and accelerating the evaporation rate. By precisely controlling the flow rate and spray intensity of each spray branch pipe 62, the risk of material foaming can be further reduced, ensuring the stable operation of the system.

[0044] Optionally, a manual valve 64 is also provided between the main spray pipe 61 and the branch spray pipes 62. The manual valve 64 is located at the end of the branch spray pipe 62 near the main spray pipe 61, where the sealing valve 622 is located. The addition of the manual valve 64 allows the operator to flexibly control the flow rate of each branch spray pipe 62. When it is necessary to adjust the spray intensity or troubleshoot, the operator can quickly close or adjust the flow rate of the relevant branch spray pipe 62 using the manual valve 64 without affecting the operation of the entire spray system. When it is necessary to maintain or repair a branch spray pipe 62, the operator can isolate the branch pipe by closing the corresponding manual valve 64, thereby ensuring the safety and smooth progress of maintenance work. This avoids the need to shut down or drain the entire spray system during maintenance, improving the reliability and utilization rate of the equipment.

[0045] In some embodiments, for better processing results, a preheating mechanism 7 is also provided on the feed pipe 5. The preheating mechanism 7 can preheat the ammonium chloride wastewater to be treated, so that it reaches a certain temperature before entering the evaporation system. This helps to reduce the energy consumption of the wastewater during the evaporation process, because the evaporation energy required for the preheated wastewater is relatively low. Through preheating, some of the water in the wastewater can evaporate in advance, thereby accelerating the entire evaporation and crystallization process and improving the processing efficiency of the equipment.

[0046] In some specific embodiments, the preheating mechanism 7 includes at least one pipe heater 8. In this embodiment 1, multiple pipe heaters 8 are provided and connected in series. Specifically, the pipe heater 8 includes a heater outer shell 81, a heater inner shell 82, a support frame 83, and a heating element 85. The heater outer shell 81 is columnar and has an outer shell connecting lip plate 811 at its edge. The heater inner shell 82 is columnar and has an inner shell connecting lip plate 821 at its edge. The heater outer shell 81 and the heater inner shell 82 are coaxially arranged, and the heater inner shell 82 is sleeved on the... On the feed pipe 5, the support frame 83 is supported between the heater outer shell 81 and the heater inner shell 82, so that an annular cavity 84 is formed between the heater outer shell 81 and the heater inner shell 82; the heating element 85 is disposed in the annular cavity 84, and the pipe heater 8 generates heat in the annular cavity 84 through the heating element 85. This heat can be quickly transferred to the ammonium chloride wastewater in the feed pipe 5, so that it reaches the required preheating temperature in a short time. The high efficiency of the heating element 85 ensures the speed and stability of the preheating process, thereby improving the processing efficiency of the entire evaporation crystallization device.

[0047] In this embodiment 1, the heating element 85 includes an electric heating wire 851 and a plurality of fins 852 surrounding the surface of the electric heating wire 851. The electric heating wire 851 is surrounded within the annular cavity 84, and the fins 852 are arranged sequentially and at intervals along the electric heating wire 851. The fins 852 not only have a heating function but also enhance the structural strength of the pipe heater 8. They can disperse and withstand the stress and pressure generated by the heater 12 during operation, improving the stability and durability of the equipment. The design of the fins 852 also helps to reduce heat loss. They can more effectively transfer heat to wastewater instead of dissipating it into the environment through other means. This helps to improve the utilization rate of thermal energy, reduce energy consumption, and reduce environmental impact.

[0048] Optionally, to reduce the amount of tiny droplets or foam entrained in the steam, in some embodiments, a demister 9 is provided inside the separator 11, and the steam pipe is connected to the demister 9. The main function of the demister 9 is to capture and remove tiny droplets or foam entrained in the steam. These foams may consist of moisture in the steam, dissolved solids, or bubbles generated by chemical reactions. Through the filtration effect of the demister 9, the purity and stability of the steam can be ensured, avoiding adverse effects of foam on subsequent processes. During steam flow, the presence of foam occupies part of the space inside the separator 11, causing liquid level fluctuations. The use of the demister 9 can remove these foams in a timely manner, thereby maintaining a stable liquid level inside the separator 11. A stable liquid level helps maintain the normal operation of the equipment and prevents equipment failure or safety hazards caused by excessively high or low liquid levels. By removing foam from the steam, the demister 9 helps improve the quality of the steam. Pure steam can more effectively transfer heat and carry out chemical reactions, thereby improving the efficiency of the entire process and product quality.

[0049] In some embodiments, a return pipe 10 may be provided between the separator 11 and the steam pipe, and the return pipe 10 may be equipped with an anti-spillage device 101. The anti-spillage device 101 is equipped with a U-shaped water seal pipe 102. When a spillage occurs in the system, the liquid material will return to the system through the inclined bucket of the anti-spillage device 101. This configuration allows a portion of the liquid in the separator 11 to be returned to the original processing system, preventing valuable materials from being lost with the steam. The return pipe 10 ensures effective material recovery and utilization, reducing material loss during production. When a spillage occurs in the system, the liquid material will return to the system through the inclined bucket of the anti-spillage device 101.

[0050] In summary, the ammonium chloride wastewater crystallization and evaporation device provided by this utility model has the following technical effects:

[0051] 1. The spraying mechanism 6 sprays ammonium chloride wastewater into the separator 11 in a more uniform and finer droplet form. This spraying method significantly increases the contact area between the wastewater and the hot steam, thereby improving the heat exchange efficiency. This means that more wastewater can be treated or a higher evaporation efficiency can be achieved with the same energy consumption.

[0052] 2. The spraying mechanism 6 effectively reduces foaming caused by the accumulation of organic matter and impurities during the evaporation process by uniformly spraying wastewater. This helps maintain the stable operation of the evaporation system, prevents materials from flowing to downstream processes through the pipeline, and thus avoids corrosion damage to downstream equipment and deterioration of steam condensate quality;

[0053] 3. The spraying unit 6 directly utilizes the ammonium chloride wastewater to be treated for spraying, avoiding the need to introduce tap water or condensate for spraying as required in traditional processes. This not only reduces the use of external water but also lowers the operating costs incurred due to the treatment of external water.

[0054] 4. By optimizing the structural design and operation process of the evaporation system, the device enhances the system's stability. The coordinated operation of components such as the spray mechanism 6, separator 11, heater 12, and circulating pump 13 ensures the continuity and stability of the wastewater treatment process, improving the reliability and durability of the entire system.

[0055] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An ammonium chloride wastewater crystallization evaporation apparatus characterized by comprising: The utility model relates to a kind of crystallization device, including: Steam circulation loop (1), which is provided with a separator (11), a heater (12) and a circulating pump (13); Discharge line (2) in communication with the steam circulation loop (1); Crystallization kettle (3) in communication with the discharge line (2); Secondary steam condensing mechanism (4) in communication with the separator (11) through a steam pipe; Feed pipe (5) in communication with the separator (11), which is provided with a feed pump (51) and a spraying mechanism (6) between the feed pipe (5) and the separator (11).

2. The ammonium chloride wastewater crystallization evaporation device according to claim 1, characterized in that, The spraying mechanism (6) includes: Spraying main pipe (61) in communication with the feed pipe (5); Spraying branch pipe (62) in communication with the spraying main pipe (61) at one end and provided with a sealing cover (621) at the other end, which is fixed to the inner wall of the separator (11), and the part of the spraying branch pipe (62) passing through the separator (11) is provided with a sealing valve (622); Spraying nozzle (63) provided on the part of the spraying branch pipe (62) located in the separator (11).

3. The ammonium chloride wastewater crystallization evaporation device according to claim 2, characterized in that, The spraying main pipe (61) is connected with a plurality of spraying branch pipes (62), and the sequential connection lines between the sealing covers (621) and the sealing valves (622) of the plurality of spraying branch pipes (62) are circular to fit the inner wall of the separator (11).

4. The ammonium chloride wastewater crystallization evaporation device according to claim 2, characterized in that, The spraying nozzles (63) on the spraying branch pipe (62) are provided in multiple and all face the directly below of the separator (11).

5. The ammonium chloride wastewater crystallization evaporation device according to claim 2, characterized in that, A manual valve (64) is further provided between the spraying main pipe (61) and the spraying branch pipe (62), which is located at the end of the spraying branch pipe (62) close to the spraying main pipe (61) with the sealing valve (622).

6. The ammonium chloride wastewater crystallization evaporation device according to claim 1, characterized in that, A preheating mechanism (7) is further provided on the feed pipe (5).

7. An ammonium chloride wastewater crystallization evaporation device according to claim 6, characterized in that, The preheating mechanism (7) includes at least one pipe heater (8), which includes: A heater outer shell (81) in the shape of a cylinder with an outer shell connecting lip plate (811) at the edge; A heater inner shell (82) in the shape of a cylinder with an inner shell connecting lip plate (821) at the edge, which is coaxially arranged with the heater outer shell (81), and the heater inner shell (82) is sleeved on the feed pipe (5); A support frame (83) supported between the heater outer shell (81) and the heater inner shell (82) to form an annular cavity (84) between the heater outer shell (81) and the heater inner shell (82); A heating element (85) provided in the annular cavity (84).

8. An ammonium chloride wastewater crystallization and evaporation apparatus according to claim 7, characterized in that, The heating element (85) includes: An electric heating wire (851) is arranged in the annular cavity (84); A plurality of plate fins (852) are arranged in sequence and spaced apart along the electric heating wire (851).

9. The ammonium chloride wastewater crystallization evaporation device according to claim 1, characterized in that, A demister (9) is arranged in the separator (11), and the steam pipeline is communicated with the demister (9).

10. The ammonium chloride wastewater crystallization evaporation device according to claim 1, characterized in that, A backflow pipeline (10) is arranged between the separator (11) and the steam pipeline, and the backflow pipeline (10) is provided with a material running prevention device (101).

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