Recycling device and method for wastewater containing ammonium chloride

Abstract

The recycling device comprises a preheating box, a heating pipe surrounds the outer surface of the preheating box, a water collecting barrel is arranged at the top in the preheating box and located below a water inlet pipe, and a plurality of overflow ports are formed in the upper end of the water collecting barrel. A drainage plate used for draining water in the water collecting barrel to the inner wall of the preheating box is arranged on the bottom face of the overflow opening, a lifting plate is movably arranged in the water collecting barrel and controlled to ascend and descend through a water inlet assembly, a sealing plate used for sealing the drainage pipe is arranged at the bottom of the preheating box, and the sealing plate is controlled to be opened or closed through a sealing mechanism. The sealing mechanism is also controlled to operate through the water inlet assembly. Water enters through the water inlet pipe to enable the water inlet assembly to drive the lifting plate to descend, ammonium chloride wastewater is stored in the water collecting barrel, meanwhile, the sealing plate is opened through the sealing mechanism, and the ammonium chloride wastewater flows to the inner wall of the preheating box from the overflow opening to be heated and is finally discharged through the drainage pipe.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a device and method for recycling ammonium chloride-containing wastewater. Background Technology

[0002] The recycling of ammonium chloride-containing wastewater is an important way to achieve resource recycling and environmental compliance (such as reducing nitrogen and chlorine emissions). Its core lies in separating and recovering ammonium chloride (NH4Cl) through physical, chemical, or biological methods. Depending on the wastewater concentration, impurity composition, and recovery target, commonly used technologies can be divided into evaporation crystallization, chemical conversion, and membrane separation. Among them, evaporation crystallization and chemical conversion are the two most commonly used in industry. Evaporation crystallization is the most direct method for recovering ammonium chloride crystals. The evaporated water vapor can be condensed and recycled as pure water, achieving dual resource recovery of "water and salt". The purity of the crystallized product can reach more than 95%, which can be used as industrial-grade ammonium chloride (used in electroplating, printing and dyeing, agricultural fertilizers, etc.).

[0003] When recovering ammonium chloride using the evaporation crystallization method, the ammonium chloride wastewater is usually poured into a concentration kettle for heating and evaporation. The water evaporates to make the ammonium chloride reach a supersaturated state and crystallize out. If the wastewater at room temperature is directly sent to the evaporator, the evaporator needs to consume a lot of energy to heat the wastewater from room temperature to boiling, which results in high costs and long time, and also low evaporation concentration efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device for recycling ammonium chloride-containing wastewater to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for recycling ammonium chloride wastewater, comprising a preheating box, wherein the preheating box gradually decreases in size downwards and has a conical structure, and the outer surface of the preheating box is surrounded by a spiral heating pipe; The preheating box is equipped with a water inlet pipe at the middle of the upper end and a drain pipe at the lower end; The preheating box is equipped with a water collection cylinder at the top inside, and the water collection cylinder is located below the water inlet pipe; The upper end of the water collection cylinder is provided with multiple overflow ports. The bottom surface of the overflow ports is provided with a diversion plate for guiding the water in the water collection cylinder to the inner wall of the preheating box. There is a gap between the outer diameter of the diversion plate and the inner wall of the preheating box. The water collection cylinder is equipped with a movable lifting plate, which is controlled to rise and fall by a water inlet assembly. The bottom of the preheating box is equipped with a sealing plate for sealing the drain pipe. The sealing plate is opened or closed by a sealing mechanism, which is also controlled by the water inlet assembly. The process involves the inlet pipe allowing water to enter, which in turn drives the lifting plate to descend, allowing ammonium chloride wastewater to be stored inside the collection cylinder. Simultaneously, the sealing plate is opened by the sealing mechanism, allowing the ammonium chloride wastewater to flow from the overflow port onto the inner wall of the preheating box for heating, and finally being discharged through the drain pipe.

[0006] Preferably, the water inlet pipe includes a first water inlet pipe and a second water inlet pipe, the second water inlet pipe is located on one side of the first water inlet pipe, and a water inlet is provided between the first water inlet pipe and the second water inlet pipe.

[0007] Preferably, the water inlet assembly includes a connecting column located at the middle of the upper end of the lifting plate, and a sealing block is provided at the upper end of the connecting column. The sealing block is located inside the water inlet pipe and seals the water inlet pipe. The lower middle part of the lifting plate is provided with a circular toothed rack, which is slidably connected to the bottom of the water collecting cylinder. The circular rack is fitted with a reset spring for resetting the lifting plate, and the reset spring is located between the bottom of the inner side of the water collection cylinder and the lifting plate. Water enters through inlet pipe 1, causing the sealing block and lifting plate to descend. Ammonium chloride wastewater enters the water collection cylinder through inlet and inlet pipe 2 for storage. After inlet pipe 1 stops supplying water, the reset spring drives the lifting plate to rise, and the lifting plate discharges the remaining ammonium chloride wastewater in the water collection cylinder from the overflow port.

[0008] Preferably, the sealing mechanism includes a fixing plate located below the water collection cylinder, and the fixing plate is fixedly connected to the bottom of the water collection cylinder through a connecting plate; The upper end of the sealing plate is provided with a second circular toothed rack, which is slidably connected to the fixing plate. Gear 1, gear 2 and gear 3 are rotatably mounted on the connecting plate respectively. Gear 1 meshes with rack 1, gear 3 meshes with rack 2, and gear 2 is located between gear 1 and gear 3 and meshes with gear 1. Both gear two and gear three are connected to pulleys via rotating shafts, and the two pulleys are connected by belt drive.

[0009] Preferably, the preheating box is provided with an air inlet pipe, which has a ring structure and a plurality of air inlet holes on its surface; The intake pipe is connected to an exhaust pipe, which extends to the outside of the preheating box and connects to the exhaust system.

[0010] Preferably, the drainage plate has an annular structure and its outer diameter surface is inclined downwards.

[0011] Preferably, the sealing plate has a sealing gasket at its bottom.

[0012] Preferably, the sealing mechanism is fitted with a sealing shell, the upper end of which is connected to the bottom of the water collecting cylinder, and the lower end is fixedly connected to the bottom of the fixing plate.

[0013] Preferably, the preheating box is covered with a protective shell.

[0014] A method for recycling ammonium chloride-containing wastewater, used in conjunction with an ammonium chloride-containing wastewater recycling device, includes the following steps: S1. Wastewater pretreatment: filtration and impurity removal treatment of ammonium chloride wastewater; S2. Preheating: Preheat the ammonium chloride wastewater to improve the efficiency of subsequent evaporation and concentration. S3. Evaporation and concentration: The preheated ammonium chloride wastewater is fed into the concentration kettle for evaporation and concentration to remove a large amount of water. S4. Cooling and crystallization: Cool the concentrated ammonium chloride wastewater to reduce its solubility and promote crystal growth. S5. Centrifugal separation: The solid-liquid mixture containing ammonium chloride crystals is fed into a centrifuge for centrifugal separation to obtain wet ammonium chloride crystals; S6. Drying: The obtained wet ammonium chloride crystals are dried to finally obtain the ammonium chloride product.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a water pump to transport ammonium chloride wastewater into the inlet pipe. After water enters the inlet pipe, the water pressure squeezes the inlet assembly, causing the inlet assembly to drive the lifting plate to descend inside the water collection cylinder, allowing the water collection cylinder to store the ammonium chloride wastewater. At the same time, the inlet assembly 5 drives the sealing mechanism to operate, causing the sealing plate to open and the drain pipe to be in the open state. After the ammonium chloride wastewater inside the water collection cylinder is full, it flows from the overflow port to the guide plate, and then flows to the inner wall of the preheating box, and flows along the inner wall of the preheating box to the drain pipe at the bottom. The heating pipe outside the preheating box can heat the preheating box, so the ammonium chloride wastewater can be preheated evenly and efficiently. After the ammonium chloride wastewater flows to the bottom of the preheating box, it is finally discharged through the drain pipe, and then flows into the concentration kettle for evaporation and concentration. After water enters the inlet pipe, ammonium chloride wastewater first enters through inlet pipe one. Under the action of water pressure, the sealing block and the lifting plate descend, which compresses the return spring. After the sealing block descends, the inlet is exposed, allowing the ammonium chloride wastewater to enter the inlet pipe two. Then, it flows into the water collection cylinder through inlet pipe two and is stored. When the water collection cylinder is full of wastewater, the water flows out from the overflow port and is used for subsequent heating. When the water inlet pipe one is shut off, there is no more water pressure to squeeze the sealing block downwards, which causes the return spring to drive the lifting plate and the sealing block to rise. The rising lifting plate pushes the remaining ammonium chloride wastewater in the water collection cylinder upwards and discharges it from the overflow port. The rising sealing block closes the inlet. When water enters the inlet pipe, the sealing block and lifting plate descend, causing the first rack to descend, which in turn causes the first gear to rotate counterclockwise, and the second gear to rotate clockwise. Through the two pulleys and belt, the third gear rotates clockwise in the same way as the second gear, causing the second rack to rise, which in turn causes the sealing plate and sealing gasket to rise, thus opening the drain pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention when it is not in use; Figure 3 This is a cross-sectional view of the present invention in use; Figure 4 This is a schematic diagram of the internal structure of the present invention during use.

[0017] In the diagram: 1. Preheating box; 2. Water inlet pipe; 21. Water inlet pipe one; 22. Water inlet pipe two; 23. Water inlet; 3. Drain pipe; 4. Water collection cylinder; 41. Overflow port; 42. Drain plate; 5. Water inlet assembly; 51. Lifting plate; 52. Connecting column; 53. Sealing block; 54. Circular rack one; 55. Return spring; 6. Sealing mechanism; 61. Sealing plate; 62. Fixing plate; 63. Connecting plate; 64. Circular rack two; 65. Gear one; 66. Gear two; 67. Gear three; 68. Pulley; 69. Belt; 610. Sealing gasket; 611. Sealing shell; 7. Air inlet pipe; 71. Air inlet hole; 72. Exhaust pipe; 8. Heating tube; 9. Protective shell. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-4This invention provides a technical solution: a device for recycling ammonium chloride wastewater, including a preheating box 1. The preheating box 1 gradually decreases in size downwards and has a conical structure. The outer surface of the preheating box 1 is surrounded by a spiral heating pipe 8. The preheating box 1 is covered with a protective shell 9. The upper middle part of the preheating box 1 is provided with a water inlet pipe 2 and the lower end is provided with a drain pipe 3. The top of the preheating box 1 is provided with a water collection cylinder 4, which is located below the water inlet pipe 2. The upper end of the water collection cylinder 4 is provided with multiple overflow ports 41. The bottom surface of the overflow ports 41 is provided with a diversion plate 42 for diverting the water in the water collection cylinder 4 to the inner wall of the preheating box 1. There is a gap between the outer diameter of the diversion plate 42 and the inner wall of the preheating box 1. The diversion plate 42 has a ring structure and the outer diameter surface is inclined downwards. The water collection cylinder 4 is equipped with a lifting plate 51, which is raised and lowered by the water inlet assembly 5. The bottom of the preheating box 1 is equipped with a sealing plate 61 for sealing the drain pipe 3. The bottom of the sealing plate 61 is equipped with a sealing gasket 610. The sealing plate 61 is opened or closed by the sealing mechanism 6, which is also controlled by the water inlet assembly 5.

[0020] When using, such as Figure 2 , 3 The ammonium chloride wastewater is pumped into the inlet pipe 2 by a water pump. After water enters the inlet pipe 2, the water pressure squeezes the inlet component 5, causing the inlet component 5 to drive the lifting plate 51 to descend inside the water collection cylinder 4, allowing the water collection cylinder 4 to store the ammonium chloride wastewater. At the same time, the inlet component 5 drives the sealing mechanism 6 to operate, causing the sealing mechanism 6 to open the sealing plate 61, so that the drain pipe 3 is in the open state. After the ammonium chloride wastewater inside the water collection cylinder 4 is full, it flows from the overflow port 41 to the guide plate 42, and then flows to the inner wall of the preheating box 1, and flows along the inner wall of the preheating box 1 to the drain pipe 3 at the bottom. The heating pipe 8 outside the preheating box 1 can heat the preheating box 1, so it can preheat the ammonium chloride wastewater evenly and efficiently. After the ammonium chloride wastewater flows to the bottom of the preheating box 1, it is finally discharged through the drain pipe 3, and then flows into the concentration kettle for evaporation and concentration.

[0021] The water inlet pipe 2 includes a first water inlet pipe 21 and a second water inlet pipe 22. The second water inlet pipe 22 is located on one side of the first water inlet pipe 21, and a water inlet 23 is provided between the first water inlet pipe 21 and the second water inlet pipe 22. The water inlet assembly 5 includes a connecting column 52 located at the middle of the upper end of the lifting plate 51. A sealing block 53 is provided at the upper end of the connecting column 52. The sealing block 53 is located inside the water inlet pipe 21 and seals the water inlet pipe 21. A circular toothed rack 54 is provided at the middle of the lower end of the lifting plate 51. The circular toothed rack 54 is slidably connected to the bottom of the water collection cylinder 4. A reset spring 55 for resetting the lifting plate 51 is sleeved on the outside of the circular toothed rack 54. The reset spring 55 is located between the bottom of the inner side of the water collection cylinder 4 and the lifting plate 51.

[0022] Among them, such as Figure 2 , 3 After water enters through inlet pipe 2, ammonium chloride wastewater first enters through inlet pipe 21. Under water pressure, sealing block 53 and lifting plate 51 descend, compressing return spring 55. After sealing block 53 descends, inlet 23 is exposed, allowing ammonium chloride wastewater to enter inlet pipe 22 from inlet 23. Then, it flows into water collection cylinder 4 through inlet pipe 22 for water storage. When water collection cylinder 4 is full of wastewater, water flows out from overflow port 41 for subsequent heating. When water inlet pipe 21 stops flowing, there is no more water pressure pressing down on sealing block 53, causing return spring 55 to drive lifting plate 51 and sealing block 53 to rise. Lifting plate 51 rises and pushes the remaining ammonium chloride wastewater in water collection cylinder 4 upward and discharges it from overflow port 41. Sealing block 53 rises to seal inlet 23.

[0023] The sealing mechanism 6 includes a fixed plate 62 located below the water collection cylinder 4. The fixed plate 62 is fixedly connected to the bottom of the water collection cylinder 4 via a connecting plate 63. A second circular rack 64 is provided on the upper end of the sealing plate 61. The second circular rack 64 is slidably connected to the fixed plate 62. Gear 65, gear 66, and gear 67 are rotatably mounted on the connecting plate 63. Gear 65 meshes with the first circular rack 64, and gear 67 meshes with the second circular rack 64. Gear 66 is located between gear 65 and gear 67 and meshes with gear 65. Gear 66 and gear 67 are both connected to pulleys 68 via rotating shafts. The two pulleys 68 are connected by a belt 69. A sealing shell 611 is fitted outside the sealing mechanism 6. The upper end of the sealing shell 611 is connected to the bottom of the water collection cylinder 4, and the lower end is fixedly connected to the bottom of the fixed plate 62.

[0024] When water enters the inlet pipe 2, the sealing block 53 and the lifting plate 51 descend, causing the first gear rack 54 to descend, causing the first gear 65 to rotate counterclockwise, and the second gear 66 to rotate clockwise. Through the two pulleys 68 and the belt 69, the third gear 67 rotates clockwise like the second gear 66, causing the second gear rack 64 to rise, causing the sealing plate 61 and the sealing gasket 610 to rise, thus opening the drain pipe 3. When the water inlet pipe 2 stops, the sealing block 53 and the lifting plate 51 rise, and the sealing mechanism 6 causes the sealing block 61 to descend and seal the drain pipe 3.

[0025] The preheating box 1 is equipped with an air inlet pipe 7. The air inlet pipe 7 has a ring structure and several air inlet holes 71 on its surface. The air inlet pipe 7 is connected to an exhaust pipe 72, which extends to the outside of the preheating box 1 and connects to the exhaust system.

[0026] The steam generated inside the preheating box 1 enters the intake pipe 7 through the intake hole 71, and then is discharged into the exhaust system through the exhaust pipe 72.

[0027] A method for recycling ammonium chloride-containing wastewater, used in conjunction with an ammonium chloride-containing wastewater recycling device, includes the following steps: S1. Wastewater pretreatment: filtration and impurity removal treatment of ammonium chloride wastewater; S2. Preheating: Preheat the ammonium chloride wastewater to improve the efficiency of subsequent evaporation and concentration. S3. Evaporation and concentration: The preheated ammonium chloride wastewater is fed into the concentration kettle for evaporation and concentration to remove a large amount of water. S4. Cooling and crystallization: Cool the concentrated ammonium chloride wastewater to reduce its solubility and promote crystal growth. S5. Centrifugal separation: The solid-liquid mixture containing ammonium chloride crystals is fed into a centrifuge for centrifugal separation to obtain wet ammonium chloride crystals; S6. Drying: The obtained wet ammonium chloride crystals are dried to finally obtain the ammonium chloride product.

[0028] The working principle and usage process of this invention are as follows: During use, a water pump delivers ammonium chloride wastewater to the inlet pipe 2. After water enters the inlet pipe 2, the ammonium chloride wastewater first enters through inlet pipe 21. Water pressure causes the sealing block 53 and the lifting plate 51 to descend, compressing the return spring 55. The descending sealing block 53 exposes the inlet 23, allowing the ammonium chloride wastewater to enter the inlet pipe 22. Then, it flows through inlet pipe 22 into the water collection cylinder 4 for storage. Simultaneously, the inlet assembly 5 drives the sealing mechanism 6, causing the sealing block 53 and the lifting plate 51 to descend, which in turn causes the gear 65 to rotate counterclockwise and the gear 66 to rotate clockwise. The rotation, through two pulleys 68 and belt 69, causes gear 3 67 to rotate clockwise, just like gear 2 66, causing rack 2 64 to rise, causing sealing plate 61 and sealing gasket 610 to rise, causing drain pipe 3 to open. After the ammonium chloride wastewater inside the water collecting cylinder 4 is full, it flows from overflow port 41 to guide plate 42, and then flows to the inner wall of preheating box 1, and flows along the inner wall of preheating box 1 to the drain pipe 3 at the bottom. The heating pipe 8 outside preheating box 1 can heat preheating box 1, so it can preheat ammonium chloride wastewater evenly and efficiently. After the ammonium chloride wastewater flows to the bottom of preheating box 1, it is finally discharged through drain pipe 3, and then flows into the concentration kettle for evaporation and concentration. When the water inlet pipe 21 is shut off, there is no longer water pressure pressing down on the sealing block 53, causing the return spring 55 to drive the lifting plate 51 and the sealing block 53 to rise. The rising lifting plate 51 pushes the remaining ammonium chloride wastewater in the water collection cylinder 4 upward and discharges it from the overflow port 41. The rising sealing block 53 seals the water inlet 23. At the same time as the sealing block 53 and the lifting plate 51 rise, the sealing mechanism 6 causes the sealing block 61 to descend and seal the drain pipe 3.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for recycling ammonium chloride-containing wastewater, comprising a preheating tank (1), characterized in that: The preheating box (1) gradually decreases in size downwards and has a conical structure. The outer surface of the preheating box (1) is surrounded by a spiral heating tube (8). The preheating box (1) is provided with a water inlet pipe (2) at the middle of the upper end and a drain pipe (3) at the lower end. The preheating box (1) is equipped with a water collection cylinder (4) at the top inside, and the water collection cylinder (4) is located below the water inlet pipe (2); The upper end of the water collection cylinder (4) is provided with multiple overflow ports (41). The bottom surface of the overflow port (41) is provided with a diversion plate (42) for diverting the water in the water collection cylinder (4) to the inner wall of the preheating box (1). There is a gap between the outer diameter of the diversion plate (42) and the inner wall of the preheating box (1). The water collection cylinder (4) is equipped with a lifting plate (51) which is movable inside. The lifting plate (51) is controlled to rise and fall by the water inlet assembly (5). The bottom of the preheating box (1) is provided with a sealing plate (61) for sealing the drain pipe (3). The sealing plate (61) is opened or closed by a sealing mechanism (6). The sealing mechanism (6) is also controlled to operate by a water inlet assembly (5). Water enters through the inlet pipe (2), causing the inlet assembly (5) to drive the lifting plate (51) to descend, so that the water collection cylinder (4) stores ammonium chloride wastewater. At the same time, the sealing plate (61) is opened through the sealing mechanism (6), and the ammonium chloride wastewater flows from the overflow port (41) to the inner wall of the preheating box (1) for heating, and is finally discharged through the drain pipe (3).

2. The device for recycling ammonium chloride-containing wastewater according to claim 1, characterized in that: The water inlet pipe (2) includes a first water inlet pipe (21) and a second water inlet pipe (22). The second water inlet pipe (22) is located on one side of the first water inlet pipe (21), and an inlet (23) is provided between the first water inlet pipe (21) and the second water inlet pipe (22).

3. The device for recycling ammonium chloride-containing wastewater according to claim 2, characterized in that: The water inlet assembly (5) includes a connecting column (52) located in the middle of the upper end of the lifting plate (51). The upper end of the connecting column (52) is provided with a sealing block (53). The sealing block (53) is located inside the water inlet pipe (21) and seals the water inlet pipe (21). The lower middle part of the lifting plate (51) is provided with a circular toothed rack (54), which is slidably connected to the bottom of the water collecting cylinder (4). The toothed rack (54) is fitted with a reset spring (55) for resetting the lifting plate (51). The reset spring (55) is located between the bottom of the inner side of the water collection cylinder (4) and the lifting plate (51). Water enters through inlet pipe 1 (21), causing the sealing block (53) and lifting plate (51) to descend. Ammonium chloride wastewater enters the water collection cylinder (4) through inlet (23) and inlet pipe 2 (22) for storage. After inlet pipe 1 (21) stops, the reset spring (55) drives the lifting plate (51) to rise. The lifting plate (51) discharges the remaining ammonium chloride wastewater in the water collection cylinder (4) from the overflow port (41).

4. The device for recycling ammonium chloride-containing wastewater according to claim 3, characterized in that: The sealing mechanism (6) includes a fixing plate (62) located below the water collection cylinder (4), and the fixing plate (62) is fixedly connected to the bottom of the water collection cylinder (4) through a connecting plate (63); The upper end of the sealing plate (61) is provided with a toothed rack (64), which is slidably connected to the fixing plate (62) in the upper and lower parts; Gear 1 (65), gear 2 (66) and gear 3 (67) are rotatably mounted on the connecting plate (63). Gear 1 (65) meshes with rack 1 (54), gear 3 (67) meshes with rack 2 (64), and gear 2 (66) is located between gear 1 (65) and gear 3 (67) and meshes with gear 1 (65). Both gear two (66) and gear three (67) are connected to pulleys (68) via rotating shafts, and the two pulleys (68) are connected by belt (69).

5. The device for recycling ammonium chloride-containing wastewater according to claim 1, characterized in that: The preheating box (1) is equipped with an air inlet pipe (7), which is a ring structure and has several air inlet holes (71) on its surface. The intake pipe (7) is connected to an exhaust pipe (72), which extends to the outside of the preheating box (1) and is connected to the exhaust system.

6. The device for recycling ammonium chloride-containing wastewater according to claim 1, characterized in that: The drainage plate (42) is an annular structure, and its outer diameter is inclined downwards.

7. The device for recycling ammonium chloride-containing wastewater according to claim 4, characterized in that: The sealing plate (61) has a sealing gasket (610) at its bottom.

8. The device for recycling ammonium chloride-containing wastewater according to claim 4, characterized in that: The sealing mechanism (6) is fitted with a sealing shell (611) on the outside. The upper end of the sealing shell (611) is connected to the bottom of the water collection cylinder (4), and the lower end is fixedly connected to the bottom of the fixing plate (62).

9. The device for recycling ammonium chloride-containing wastewater according to claim 1, characterized in that: The preheating box (1) is covered with a protective shell (9).

10. A method for recycling ammonium chloride-containing wastewater, used in conjunction with the ammonium chloride-containing wastewater recycling device according to claim 1, characterized in that, Includes the following steps: S1. Wastewater pretreatment: filtration and impurity removal treatment of ammonium chloride wastewater; S2. Preheating: Preheat the ammonium chloride wastewater to improve the efficiency of subsequent evaporation and concentration. S3. Evaporation and concentration: The preheated ammonium chloride wastewater is fed into the concentration kettle for evaporation and concentration to remove a large amount of water. S4. Cooling and crystallization: Cool the concentrated ammonium chloride wastewater to reduce its solubility and promote crystal growth. S5. Centrifugal separation: The solid-liquid mixture containing ammonium chloride crystals is fed into a centrifuge for centrifugal separation to obtain wet ammonium chloride crystals; S6. Drying: The obtained wet ammonium chloride crystals are dried to finally obtain the ammonium chloride product.

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