Ammonia treatment equipment for ammonium chloride evaporation crystallization

Abstract

This invention relates to the field of ammonia treatment technology, specifically to an ammonia treatment device for ammonium chloride evaporation and crystallization, comprising a support frame, a treatment tower, an inlet, an outlet, a spray device, an adjusting device, a stirring device, and a collecting device. The support frame is fixed, and the treatment tower is fixedly installed above the support frame. An inlet is located at the bottom of the treatment tower, and an outlet is located at the top. Spray devices are arranged in an array inside the treatment tower, and each spray device contains packing material to ensure sufficient contact between the spray liquid and the waste gas. The spray devices are used for graded spraying according to the flow path of the waste gas. The adjusting device is installed outside the spray devices and is used to adjust the tilt angle of the spray devices to facilitate the replacement of the packing material. The stirring device is fixedly installed inside the treatment tower and is used to stir the packing material to further ensure contact between the packing material and the waste gas. The collecting device is fixedly installed at the bottom of the treatment tower and is used to collect the treated solution.

Description

Technical Field

[0001] This invention relates to the field of ammonia treatment technology, and more specifically to an ammonia treatment device for ammonium chloride evaporation and crystallization. Background Technology

[0002] In the industrial production and evaporation crystallization process of ammonium chloride, ammonia-containing waste gas with high temperature and high humidity is inevitably generated. To meet increasingly stringent environmental emission standards and achieve resource recycling, acid washing and spray absorption towers are typically used to treat the waste gas. This involves using dilute sulfuric acid solution to neutralize the ammonia in the waste gas, generating ammonium sulfate solution. The core of this process lies in the efficient mass transfer and chemical reaction between ammonia molecules in the gas phase and sulfuric acid molecules in the liquid phase on the surface of the packing material.

[0003] Most existing ammonium chloride waste gas treatment equipment adopts a static spray structure. In this traditional structure, the contact between waste gas and spray liquid mainly relies on the natural spread of gravity flow. In actual operation, the "wall flow effect" or "channeling phenomenon" is prone to occur, meaning that the spray liquid tends to flow rapidly down the tower wall or specific low-resistance channels, resulting in uneven gas-liquid distribution. This uneven gas-liquid distribution directly leads to insufficient gas-liquid contact, severely restricting absorption efficiency. To ensure that the ammonia nitrogen in the exhaust gas meets the standards, operators are often forced to significantly increase the spray volume or the initial concentration of dilute sulfuric acid, attempting to compensate for insufficient mass transfer efficiency through "overspraying." This extensive operating mode not only fails to fundamentally solve the problem of incomplete reaction but also leads to a huge waste of dilute sulfuric acid resources. A large amount of unreacted active acid is discharged with the circulating liquid or needs to be circulated ineffectively in the system, which not only increases the consumption cost of neutralizing agents but also increases the load on subsequent waste liquid treatment.

[0004] Therefore, the present invention provides an ammonia gas treatment device for ammonium chloride evaporation and crystallization to solve the above-mentioned problems. Summary of the Invention

[0005] The technical problem this invention aims to solve is as follows: Most existing ammonium chloride waste gas treatment equipment adopts a static spray structure. In this traditional structure, the contact between waste gas and spray liquid mainly relies on the natural spread of gravity flow. In actual operation, the "wall flow effect" or "channeling phenomenon" is prone to occur, meaning the spray liquid tends to flow rapidly down the tower wall or specific low-resistance channels, resulting in uneven gas-liquid distribution. This uneven gas-liquid distribution directly leads to insufficient gas-liquid contact, severely restricting absorption efficiency. To ensure that the ammonia nitrogen in the exhaust meets the standards, operators are often forced to significantly increase the spray volume or the initial concentration of dilute sulfuric acid, attempting to compensate for insufficient mass transfer efficiency through "overspraying." This extensive operating mode not only fails to fundamentally solve the problem of incomplete reaction but also leads to a huge waste of dilute sulfuric acid resources. A large amount of unreacted active acid is discharged with the circulating liquid or needs to be circulated ineffectively in the system, which not only increases the consumption cost of neutralizing agents but also increases the load on subsequent waste liquid treatment.

[0006] This invention provides the following technical solution: an ammonia gas treatment device for ammonium chloride evaporation and crystallization, comprising a support frame, a treatment tower, an inlet, an outlet, a spray device, an adjustment device, a stirring device, and a collection device. The support frame is fixed, and the treatment tower is fixedly installed above the support frame. The treatment tower has an inlet at its bottom and an outlet at its top. Spray devices are arrayed inside the treatment tower, and each spray device contains packing material to ensure sufficient contact between the spray liquid and the waste gas. The spray devices are used for graded spraying according to the flow path of the waste gas. The adjustment device is installed outside the spray devices and is used to adjust the tilt angle of the spray devices to replace the packing material. The stirring device is fixedly installed inside the treatment tower and is used to stir the packing material to further contact it with the waste gas. The collection device is fixedly installed at the bottom of the treatment tower and is used to collect the treated solution.

[0007] Preferably, the spraying device includes a liquid supply component, a mounting groove, a rotating column, a spray plate, a liquid inlet, vent holes, and atomizing nozzles. The liquid supply component is fixedly installed on one side of the treatment tower. The treatment tower has an array of mounting grooves arranged symmetrically within it. The rotating column is rotatably installed within the mounting grooves. The spray plate is fixedly installed on the mounting column, and the spray plate and the mounting column are integrally formed hollow structures. The spray plate has an array of vent holes, and atomizing nozzles are installed in an array between the vent holes. The mounting column has a liquid inlet at its end, and the liquid supply component is connected to the liquid inlet.

[0008] Preferably, the liquid supply assembly includes a storage tank, a delivery pump, a first delivery pipe, and a second delivery pipe. The storage tank is fixedly installed on one side of the treatment tower, and the delivery pump is fixedly installed on the storage tank. The first delivery pipe is fixedly installed on the delivery pump, and the second delivery pipe is installed on the first delivery pipe. The second delivery pipe is connected to the mounting column through the inlet to complete the liquid supply. The liquid supply assembly has two sets, namely a first liquid supply assembly and a second liquid supply assembly. The first liquid supply assembly delivers dilute sulfuric acid solution to the spray device, and the second liquid supply assembly delivers industrial water to the spray device.

[0009] Preferably, the spray devices are arranged in pairs of four groups, and the spray devices divide the interior of the treatment tower into a first spray zone, a second spray zone, a third spray zone, and a fourth spray zone. The filler in the second spray zone is hollow spherical filler placed above the spray device in the first spray zone; the filler in the third spray zone is Pall ring filler placed above the spray device in the second spray zone; and the filler in the fourth spray zone is Taylor ring filler placed above the spray device in the third spray zone.

[0010] Preferably, the second spray zone is provided with a variable diameter channel that increases air velocity to enhance turbulent mixing, and the internal cross-section of the variable diameter channel is a Venturi tube structure.

[0011] Preferably, the regulating device includes an regulating chamber, rotating gears, a transmission chain, a reducer, and a regulating motor. The regulating chambers are symmetrically installed on one side of the treatment tower. Rotating gears are arranged in an array inside the regulating chambers. The rotating gears are fixedly installed on rotating columns located in the first spray zone, the second spray zone, and the third spray zone. The rotating gears are engaged with the transmission chain. The regulating motor is fixedly installed on the rotating column at the bottom.

[0012] Preferably, the processing tower is equipped with a fixed array of limiting blocks for limiting the rotation of the spraying device.

[0013] Preferably, the stirring device includes a fixed frame, a stirring motor, a stirring shaft, and a stirring rod. The fixed frame is fixedly installed on the top of the processing tower and is arranged in a cross shape. The stirring motor is fixedly installed between the fixed frames. The stirring shaft is fixedly installed at the output end of the stirring motor. The stirring rod is fixedly installed on the stirring shaft.

[0014] Preferably, the collection device includes a collection funnel, a reaction chamber, a liquid outlet trough, an overflow plate, and a collection box. The collection funnel is fixedly installed at the bottom of the treatment tower. The reaction chamber is fixedly installed on the support frame. The internal height of the reaction chamber is greater than the height of the collection funnel. A liquid outlet trough is opened at the bottom of the reaction chamber. A collection box is fixedly installed on the right side of the liquid outlet trough, and an overflow plate is fixedly installed inside the collection box.

[0015] Preferably, a first movable door for collecting packing material is rotatably installed on one side of the reaction tank, and a second movable door for placing packing material is rotatably installed in an array on the treatment tower, with each second movable door corresponding to a spray plate.

[0016] The beneficial effects of this invention are as follows: 1. This invention utilizes a hollow, layered structure where the spray plate and rotating column are integrally formed. This structure forces the rising exhaust gas through the vents and instantaneously orthogonally mixes it with the adjacent atomized high-density liquid curtain. Combined with a specially designed Venturi variable-diameter channel in the second spray zone, the powerful aerodynamic shear force generated by the rapid acceleration of the airflow achieves secondary droplet breakage and phase interface renewal, completely breaking the boundary limitations of traditional laminar mass transfer. Simultaneously, based on thermodynamic and fluid dynamic characteristics, an inverted pyramid-shaped variable-fluidity gradient spray system with dimensions DN80-DN65-DN50 is constructed. The bottom layer uses a high-fluidity liquid curtain to achieve millisecond-level rapid cooling and violent dust removal of high-temperature exhaust gas. The middle layer uses the high impact force of the spiral nozzles to drive the fluidization and self-cleaning of the hollow spherical packing. The top layer uses wide-angle micro-mist to prevent Pall ring flooding and enhance film formation. This "hierarchical construction and gradient purification" process layout not only solves the contradiction between crystallization blockage and low mass transfer efficiency in the treatment of high-concentration ammonia nitrogen exhaust gas, but also significantly improves the thermal stability and operational efficiency of the system.

[0017] 2. This invention utilizes the synergistic effect of a chain-gear linkage tilting adjustment mechanism and a cross-array active stirring device. On the one hand, during operation, the stirring rod continuously breaks the static accumulation balance of the packing layer, forcing the packing particles to tumble and recombine to eliminate reaction dead zones. On the other hand, during maintenance, the motor drives the multi-stage spray assembly to synchronously flip downwards to open the discharge gap. Combined with the stirring action, this achieves gravity sliding and concentrated rapid discharge of waste packing material from the bottom, completely changing the traditional situation of difficult operation and long cleaning cycles in confined spaces of packed towers. In addition, the heterogeneous packing combination of "hollow sphere anti-clogging - Pall ring uniform distribution - Taylor ring defoaming" matched for different reaction stages ensures permeability in the high-concentration zone while achieving deep elution in the low-concentration zone, significantly extending the maintenance-free operation cycle and adaptability to all working conditions of the equipment.

[0018] 3. This invention constructs a composite treatment barrier of "three-stage acid washing for ammonia removal at the front and one-stage water washing for defoaming at the back" through the coordinated operation of dual independent liquid supply components and a bottom overflow settling system. While efficiently neutralizing ammonia molecules in the waste gas with dilute sulfuric acid of gradient concentration, it effectively intercepts and captures tiny acidic droplets entrained in the airflow by utilizing the high liquid holding capacity of the top pure water spray layer and Taylor ring packing, preventing secondary aerosol pollution and fan corrosion. Combined with the reaction box and overflow plate structure integrated at the bottom of the tower, the principle of gravity settling is used to retain ammonium chloride crystals and packing debris entrained in the circulating liquid in the sedimentation zone, allowing only the clarified mother liquor to overflow for reuse or discharge. This achieves integrated waste gas treatment, resource recovery and equipment protection, meeting the dual stringent requirements of environmental protection emissions and by-product purity in the ammonium chloride production process. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the spray plate of the present invention; Figure 4 This is a schematic diagram showing the installation positions of the atomizing nozzle and the vent hole of the present invention; Figure 5 This is a schematic diagram of the liquid supply assembly of the present invention; Figure 6 This is a schematic diagram of the collection device of the present invention; Figure 7 This is a schematic diagram of the internal partitioning of the processing tower according to the present invention; Figure 8 This is a schematic diagram of the variable diameter channel of the present invention; Figure 9 This is a schematic diagram of the adjusting device of the present invention; Figure 10 This is a schematic diagram showing the installation position of the stirring device of the present invention; Figure 11 This is a schematic diagram of the three types of packing materials of the present invention.

[0021] In the diagram: 1. Support frame; 2. Treatment tower; 21. First spray zone; 22. Second spray zone; 23. Third spray zone; 24. Fourth spray zone; 25. Variable diameter channel; 26. Limiting block; 27. Second movable door; 3. Air inlet; 4. Air outlet; 5. Spraying device; 51. Liquid supply assembly; 511. Liquid storage tank; 512. Infusion pump; 513. First infusion pipe; 514. Second infusion pipe; 52. Mounting groove; 53. Rotating column; 54. Spraying... 55. Liquid inlet; 56. Vent hole; 57. Atomizing nozzle; 6. Adjustment device; 61. Adjustment chamber; 62. Rotating gear; 63. Transmission chain; 64. Adjustment motor; 7. Stirring device; 71. Fixing frame; 72. Stirring motor; 73. Stirring shaft; 74. Stirring rod; 8. Collection device; 81. Collection funnel; 82. Reaction chamber; 821. No. 1 movable door; 83. Liquid outlet tank; 84. Overflow plate; 85. Collection box; 9. Packing material. Detailed Implementation

[0022] like Figures 1 to 11 As shown, an ammonia treatment device for ammonium chloride evaporation and crystallization includes a support frame 1, a treatment tower 2, an air inlet 3, an air outlet 4, a spray device 5, an regulating device 6, a stirring device 7, and a collection device 8. The support frame 1 is fixed, and the treatment tower 2 is fixedly installed on top of the support frame 1. The treatment tower 2 has an air inlet 3 at its bottom and an air outlet 4 at its top. Simultaneously, a multi-stage combined gas-liquid separator is installed at the air outlet 4 to intercept absorbent droplets and fine salt particles entrained in the flue gas, preventing secondary particulate pollution and corrosion of downstream equipment. In cold regions or environmentally sensitive areas, a flue gas reheating and whitening device can be optionally installed at the rear end of the air outlet 4 to eliminate visual plumes. The treatment tower 2 has an array of spray devices 5, and each spray device 5 contains packing material 9 to ensure sufficient contact between the spray liquid and the waste gas. The spray devices 5 are used for graded spraying according to the flow path of the waste gas. The regulating device 6 is installed outside the spray devices 5. The adjusting device 6 is used to adjust the tilt angle of the spraying device 5 to replace the packing 9; the stirring device 7 is fixedly installed inside the treatment tower 2, and the stirring device 7 is used to stir the packing 9 to further contact the packing 9 with the waste gas; the collecting device 8 is fixedly installed at the bottom of the treatment tower 2, and the collecting device 8 is used to collect the treated solution. The hollow, layered structure, formed integrally with the spray plate 54 and rotating column 53, forces the rising exhaust gas through the vent holes 56 and instantaneously orthogonally mixes it with the adjacent atomized high-density liquid curtain. Combined with the Venturi variable-diameter channel 25 specially designed in the second spray zone 22, the powerful aerodynamic shear force generated by the rapid acceleration of the airflow achieves secondary droplet breakage and phase interface renewal, completely breaking the boundary limitations of traditional laminar mass transfer. Simultaneously, based on thermodynamic and fluid dynamic characteristics, an inverted pyramid-shaped variable-flux gradient spray system (DN80-DN65-DN50) is constructed. The bottom layer utilizes a high-flux liquid curtain to achieve millisecond-level rapid cooling and powerful dust removal of the high-temperature exhaust gas, while the middle layer utilizes a spiral... The high-impact force of the rotary nozzle drives the hollow spherical packing 9 to fluidize and self-clean. The top layer utilizes wide-angle micro-mist to prevent flooding of the Pall ring and enhance film formation. This "hierarchical construction and gradient purification" process layout not only solves the contradiction between crystallization blockage and low mass transfer efficiency in the treatment of high-concentration ammonia nitrogen waste gas, but also significantly improves the thermal stability and operational efficiency of the system. At the same time, through the synergistic effect of the inclined adjustment mechanism linked by the chain gear and the cross-array active stirring device 7, on the one hand, in the operation state, the stirring rod 74 continuously breaks the static stacking balance of the packing 9 layer, forcing the packing 9 particles to roll and recombine to eliminate reaction dead zones. On the other hand, in the maintenance state, the motor 64 is adjusted to drive... The multi-stage spray assembly synchronously flips downwards to open the discharge gap, and in conjunction with the stirring action, achieves gravity sliding and concentrated rapid discharge of the waste packing 9 from the bottom, completely changing the situation of difficult operation and long cleaning cycle in the confined space of traditional packing 9 towers. In addition, the heterogeneous packing 9 combination of "hollow ball anti-clogging - Pall ring uniform distribution - Taylor ring defoaming" matched for different reaction stages ensures the permeability of the high concentration zone while achieving deep elution in the low concentration zone, significantly extending the maintenance-free operation cycle and adaptability to all working conditions of the equipment. Through the coordinated operation of the dual independent liquid supply assembly 51 and the bottom overflow sedimentation system, a "front-end three-stage acid washing deammoniation and end-stage water washing defoaming" system is constructed. The composite treatment barrier effectively neutralizes ammonia molecules in the waste gas using gradient concentrations of dilute sulfuric acid, while utilizing the high liquid holding capacity of the top pure water spray layer and the Taylor ring packing 9 to effectively intercept and capture tiny acidic droplets entrained in the airflow, preventing secondary aerosol pollution and fan corrosion. Combined with the integrated reaction box 82 and overflow plate 84 structure at the bottom of the tower, the principle of gravity settling is used to retain ammonium chloride crystals and packing 9 debris entrained in the circulating liquid in the sedimentation zone, allowing only the clarified mother liquor to overflow for reuse or discharge. This achieves integrated waste gas treatment, resource recovery, and equipment protection, meeting the stringent requirements of the ammonium chloride production process for both environmental emissions and by-product purity.

[0023] like Figures 1 to 5As shown, the spraying device 5 includes a liquid supply assembly 51, a mounting groove 52, a rotating column 53, a spray plate 54, a liquid inlet 55, a vent 56, and an atomizing nozzle 57. The liquid supply assembly 51 is fixedly installed on one side of the treatment tower 2 and is used to supply liquid to the spray plate 54. The treatment tower 2 has an array of mounting grooves 52 arranged symmetrically within it. The mounting grooves 52 are used to limit the rotation column 53. The mounting column is rotatably installed within the mounting groove 52. The mounting column is used to install the spraying device 5 in the treatment tower 2 and allows the spraying device 5 to rotate around the mounting column. The spray plate 54 is fixedly installed on the mounting column and has a hollow structure for supplying liquid to the atomizing nozzle 57. The nozzle 57 supplies liquid; the spray plate 54 and the mounting column are integrally formed hollow structures; the spray plate 54 has an array of vent holes 56, and atomizing nozzles 57 are installed in an array between the vent holes 56; the vent holes 56 are used to allow the sprayed gas to continue to rise and receive multi-stage spraying until it is discharged; the end of the mounting column has a liquid inlet 55, which is used to supply liquid to the rotating column 53 and the spray plate 54; it should be noted that the second inlet pipe 514 of the liquid supply assembly 51 is inserted into the rotating column 53, and a commonly used sealing process is used to ensure the sealing effect; for example, the second inlet pipe 514 of the liquid supply assembly 51 and the liquid inlet 55 of the rotating column 53 can be connected by a rotary joint resistant to acid and alkali corrosion. The rotary joint includes a fixed end and a rotating end. The fixed end is connected to the second inlet pipe 514, and the rotating end is fixed to the end of the rotating column 53 by threads or flanges, and a dynamic sealing ring made of polytetrafluoroethylene or graphite is provided inside. This structure ensures that the dilute sulfuric acid solution can smoothly enter the rotating column 53 and the hollow spray plate 54 from the stationary pipeline, and also ensures that no acid leakage will occur at the interface when the rotating column 53 is rotated by the motor 64 to adjust the angle. The liquid supply component 51 is connected to the liquid inlet 55. During operation, the liquid supply assembly 51, fixed to one side of the treatment tower 2, begins to work, pressurizing and extracting the absorbent (such as dilute sulfuric acid or water) from the storage tank 511. The absorbent is transported through pipelines and injected into the rotating column 53 through the inlet 55 via a sealed connection structure. Since the spray plate 54 and the rotating column 53 are integrally formed hollow structures, the absorbent entering the rotating column 53 quickly fills the entire internal cavity of the spray plate 54. Under the action of liquid pressure, the absorbent is distributed in an array on the surface of the spray plate 54. The atomizing nozzle 57 sprays out at high speed, forming a diffused atomized liquid curtain; at the same time, the high-temperature ammonia-containing waste gas rising from the bottom of the tower passes through the array of vents 56 on the spray plate 54. During the process of passing through the vents 56 and flowing over the surface of the spray plate 54, the waste gas and the high-density atomized liquid droplets undergo violent turbulent mixing and contact, completing gas-liquid mass transfer and chemical reaction; the gas after this stage of washing continues to flow upward through the vents 56 and enters the next stage of spraying area to undergo multi-stage purification until it meets the emission standards. By adopting a hollow structure design that integrates the spray plate 54 and the rotating column 53, the liquid delivery pipeline and the gas distribution device are cleverly integrated into the same component, effectively simplifying the complex spray network layout inside the tower and improving the space utilization rate inside the tower. During operation, the rising exhaust gas is forced to pass through the vent holes 56 on the spray plate 54. At the moment of passing through the holes, it undergoes violent turbulent mixing with the high-density liquid curtain sprayed by the adjacent atomizing nozzle 57. This "layer-through" contact method breaks the laminar flow boundary of traditional spraying, significantly enhances the renewal rate and mass transfer effect of the gas-liquid interface, thereby greatly improving the absorption and reaction efficiency of high-temperature ammonia-containing exhaust gas. At the same time, the rotating installation structure ensures the liquid supply sealing while also providing a flexible structural basis for the maintenance of the packing 9 of the device.

[0024] like Figure 5 As shown, the liquid supply assembly 51 includes a storage tank 511, a pump 512, a first infusion pipe 513, and a second infusion pipe 514. The storage tank 511 is fixedly installed on one side of the treatment tower 2 and is used to store liquid. The pump 512 is fixedly installed on the storage tank 511 and is used to transport the liquid to the inside of the spray device 5. The first infusion pipe 513 is fixedly installed on the pump 512 and is used to transport the liquid to the second infusion pipe 514. The second infusion pipe 514 is installed on the first infusion pipe 513. 14. Liquid supply is completed by connecting the liquid inlet 55 to the mounting column; the second liquid delivery pipe 514 is used to transport the liquid to the spray device 5 to complete the spraying; the liquid supply assembly 51 has two sets, namely the first liquid supply assembly 51 and the second liquid supply assembly 51. The first liquid supply assembly 51 supplies dilute sulfuric acid solution to the spray device 5 and sprays dilute sulfuric acid solution into the first spray zone 21, the second spray zone 22 and the third spray zone 23; the second liquid supply assembly 51 supplies industrial water to the spray device 5; the second liquid supply assembly 51 sprays industrial water into the fourth spray zone 24; During operation, the infusion pump 512, fixedly installed on the liquid storage tank 511, is started. The infusion pump 512 pressurizes and extracts the liquid stored in the liquid storage tank 511 and pushes it to the first infusion pipe 513. The liquid flows along the pipe into the second infusion pipe 514, and then enters the installation column and spray device 5 through the connection between the second infusion pipe 514 and the liquid inlet 55. During this process, the first liquid supply component 51 operates continuously, delivering dilute sulfuric acid solution to the spray devices 5 located in the first spray zone 21, the second spray zone 22, and the third spray zone 23, respectively, using dilute sulfuric acid to perform multi-stage chemical absorption of the rising waste gas. At the same time, the second liquid supply component 51 operates synchronously, delivering industrial water to the spray device 5 located in the fourth spray zone 24, performing end-of-pipe water washing purification on the acid-washed waste gas. The liquid is finally atomized and sprayed out by the spray device 5, completing the graded treatment of the waste gas. The liquid supply component 51 adopts a dual-path independent liquid supply system design, realizing precise treatment by "differentiated treatment based on zone and quality". Dilute sulfuric acid is centrally delivered to the first to third spray zones 23 through the first liquid supply component 51, constructing a high-strength multi-level chemical absorption barrier to ensure that ammonia in the waste gas is efficiently neutralized and removed. At the same time, industrial water is separately delivered to the fourth spray zone 24 at the top through the second liquid supply component 51, forming a terminal clean water barrier. This not only deeply washes away residual trace ammonia, but also effectively intercepts and removes acidic mist droplets entrained in the waste gas, preventing secondary pollution. This composite process of "front-end acid washing to remove ammonia and terminal water washing to remove foam", combined with pressurized delivery by pumps and pipelines, significantly improves the purification depth and emission safety of the system.

[0025] like Figure 6 , Figure 7 and Figure 11As shown, the spray devices 5 are arranged in pairs of four groups, dividing the interior of the treatment tower 2 into a first spray zone 21, a second spray zone 22, a third spray zone 23, and a fourth spray zone 24. The diameter of the second infusion pipe 514 in the first spray zone 21 is DN80; the diameter of the second infusion pipe 514 in the second spray zone 22 is DN65; and the diameter of the second infusion pipe 514 in the third spray zone 23 is DN50. The packing material 9 in the second spray zone 22 is hollow spherical packing material placed above the spray device 5 in the first spray zone 21; the packing material 9 in the third spray zone 23 is Pall ring packing material placed above the spray device 5 in the second spray zone 22; and the packing material 9 in the fourth spray zone 24 is Taylor ring packing material placed above the spray device 5 in the third spray zone 23. The first spray zone... The diameter of the No. 2 infusion pipe 514 in zone 21 is DN80 because the first spray zone 21 needs to handle 45% of the total flow rate, mainly used for rapid cooling and violent dust removal, that is, directly spraying onto the exhaust gas to cool it down, while also washing away the internal dust. It mainly relies on the "liquid curtain" for cooling. If the flow rate is too small, the water will evaporate too quickly, and the ammonium sulfate will directly form hard lumps on the tower wall and nozzles. The atomizing nozzle 57 in the first spray zone 21 is a large-diameter, solid cone nozzle (not easy to clog), and the atomized particle size can be slightly coarser. The diameter of the No. 2 infusion pipe 514 in the second spray zone 22 is DN65 because the second spray zone 22 needs to handle 35% of the total flow rate. This is mainly because the second spray zone 22 has the highest ammonia concentration, the most violent reaction, the largest salt production, and a large porosity (90%) of the multifaceted hollow sphere, which can withstand a large spray volume. The high flow rate here is not primarily for wetting, but rather to provide "mechanical flushing force" to make the spheres roll, flushing away the generated salt and preventing caking. The atomizing nozzle 57 in the second spray zone 22 can be a spiral nozzle, which produces a solid cone-shaped spray with strong droplet impact. This impact force can penetrate the surface of the hollow sphere stack and provide sufficient kinetic energy to push the surface hollow spheres to roll slightly, thus achieving "self-cleaning." The diameter of the second infusion pipe 514 in the third spray zone 23 is DN50 because the second spray zone 22 needs to handle 20% of the total flow rate. This is mainly because the ammonia concentration in the third spray zone 23 is low, requiring high mass transfer efficiency, and the Pall rings are denser than the hollow spheres, resulting in greater resistance. If a large amount of water is sprayed towards the bottom layer, the gas cannot penetrate (causing flooding). The flow rate here only needs to ensure complete wetting of the packing 9 surface to form a thin film; it does not need to be too high. The atomizing nozzle 57 is a wide-angle solid cone nozzle; a wide-angle solid cone nozzle produces finer droplets under the same pressure. Fine droplets are more likely to spread into a thin film on the complex surface of the Pall rings, rather than flowing away directly as water, thus greatly improving the gas-liquid contact efficiency; at the same time, due to its large spray angle (120°), it can cover a large area even at a small flow rate, avoiding the phenomenon that the gas cannot pass through the packing layer due to excessive local flow (i.e., flooding). The above design adopts the design concept of "variable flux gradient coupling differentiated spraying". Based on the thermodynamic and hydrodynamic characteristics of the waste gas treatment process, it uses a stepped configuration of 514 diameter (DN80, DN65, DN50) No. 2 liquid delivery pipes at each level: the bottom first spray zone 21 uses a high-flux liquid curtain and large-diameter nozzles to achieve instantaneous rapid cooling and violent dust removal of high-temperature waste gas, eliminating scale buildup on the tower wall from the source; the middle second spray zone 22 uses a high-impact jet from a spiral nozzle with a suitable flow rate to effectively drive the fluidization and rolling of the 9 layers of multi-faceted hollow spherical packing, constructing a "mechanical self-cleaning" mechanism to solve the problem of salt crystallization blockage in the high-reaction zone; the upper third spray zone 23 uses wide-angle micro-mist nozzles with small flow rate control to achieve the ultimate spreading of the liquid film and deep mass transfer while avoiding the risk of "flooding" of the 9 layers of Pall ring packing; this design achieves perfect matching of gas and liquid loads, significantly improving the overall treatment efficiency and energy consumption ratio while ensuring long-term stable operation of the system; Meanwhile, the second spray zone 22 uses hollow spherical packing 9 because the ammonia concentration is highest here, the reaction is violent, the amount of ammonium sulfate crystals generated is large, and the spray liquid flow rate is large, making it prone to clogging. The multifaceted hollow spheres have a very high free porosity (90%) and a large flow channel cross-section, allowing turbid liquids carrying a large number of crystal particles to pass through quickly, thus eliminating the risk of "bridging clogging" from a physical structure perspective. At the same time, taking advantage of the spheres' light weight (low density), under the impact of high-intensity airflow and the large flow rate of the spiral nozzle, the spheres are in a semi-fluidized state within the bed, resulting in irregular rolling and collisions. This continuous mechanical movement can effectively shake off the salt scale adhering to the surface of the packing 9, realizing the "online self-cleaning" of the packing 9 layer and ensuring the long-term stable operation of the system under harsh working conditions.

[0026] The third spray zone 23 uses Pall ring packing 9. Because most of the crystals here have been trapped by the lower layer, the waste gas concentration is reduced, and the core task becomes to increase the gas-liquid contact area to improve the reaction rate. The Pall ring has a windowed sidewall and an inwardly extending tongue structure, which greatly improves the radial distribution performance of gas and liquid. It can continuously cut and guide the liquid into the interior of the packing layer 9, effectively suppressing the "wall flow effect" and ensuring the uniformity of gas-liquid distribution on the cross-section. At the same time, its open annular structure promotes turbulence and renewal on the liquid film surface, significantly improving the mass transfer coefficient compared to hollow spheres. It can achieve efficient absorption of medium and low concentration ammonia gas within a limited tower height, while its resistance is moderate, avoiding premature flooding at high gas velocities.

[0027] The fourth spray zone 24 uses Taylor ring packing 9 because the exhaust gas is close to the outlet here, the ammonia content is extremely low (ppm level), the driving force is small, and it may carry away tiny acid mists splashed from the lower layer. Taylor rings are made of many interlocking annular filaments, which have a huge specific surface area and surface tension effect. This significantly prolongs the gas-liquid contact time (residence time), and has excellent deep washing ability for trace amounts of ammonia that are difficult to remove. At the same time, its complex labyrinth structure forms a highly efficient inertial impaction target. When the airflow carrying acid mist passes through, the tiny droplets are captured and agglomerated into larger droplets, achieving the dual function of "packing 9 + demister". This effectively prevents acid mist droplets from escaping and corroding the fan, ensuring the cleanliness of the exhaust gas.

[0028] like Figure 8 As shown, a variable-diameter channel 25 is provided in the second spray zone 22 to increase the air velocity and enhance turbulent mixing. The internal cross-section of the variable-diameter channel 25 is a Venturi tube structure. The inner diameter of the variable-diameter channel 25 gradually decreases along the direction of exhaust gas flow (from bottom to top) to form a contraction section, and then gradually expands to form a diffusion section. The narrowest part in the middle forms the throat. When the gas flows through the throat, the flow velocity increases sharply, generating local low pressure and high turbulence using Bernoulli's principle, thereby achieving the above-mentioned enhanced mixing effect. The variable-diameter channel 25 with a Venturi tube structure is innovatively introduced in the second spray zone 22 where the reaction is most intense, utilizing the "Venturi effect" of fluid mechanics. "A local high-velocity turbulent field was constructed inside the tower. When the rising waste gas flows through the variable-diameter throat section, it is forced to accelerate rapidly, generating a strong aerodynamic shear force. This not only forces the spray droplets to undergo secondary breakage and atomization, greatly increasing the specific surface area of ​​the gas-liquid contact, but also more violently disturbs and breaks the laminar boundary layer of the gas-liquid interface, significantly accelerating the surface renewal and mass transfer reaction rate. Thus, high-concentration ammonia gas can be efficiently captured in a limited space. In addition, the high-speed turbulence generated by this structure also has a strong airflow scouring and disturbance effect on the nine layers of hollow sphere packing in this area, effectively disrupting the steady-state environment for crystal growth and further enhancing the device's resistance to crystallization blockage."

[0029] like Figure 9 As shown, the regulating device 6 includes an regulating chamber 61, rotating gears 62, a transmission chain 63, a reducer, and a regulating motor 64. The regulating chamber 61 is symmetrically installed on one side of the processing tower 2 and is used to protect the regulating device 6. Rotating gears 62 are arranged in an array within the regulating chamber 61, and these gears drive the spraying device 5 to rotate. The rotating gears 62 are fixedly installed on rotating columns 53 located in the first spraying zone 21, the second spraying zone 22, and the third spraying zone 23. The rotating gears 62 mesh with the transmission chain 63, which drives the remaining rotating gears 62 to rotate. The regulating motor 64 is fixedly installed on the rotating column 53 at the bottom. The regulating motor 64 drives the spraying device 5 to rotate. During operation, since the second spray zone 22, the third spray zone 23, and the fourth spray zone 24 are all equipped with packing material 9, they need to be replaced after a long period of use. At this time, the regulating motor 64 can be started. A reducer is installed between the regulating motor 64 and the rotating column 53. Through the reducer, the regulating motor 64 rotates and drives the rotating column 53 to rotate slowly, causing the spray device 5 to rotate downward. At the same time, the rotating gear 62 drives the transmission chain 63 to rotate, thereby causing the upper spray devices 5 to rotate downward. At this time, a gap appears between the two spray devices 5 located on the same horizontal plane. Simultaneously, with the help of the stirring device 7, all the packing material 9 slides down to the bottom of the treatment tower 2. The packing material 9 is then removed from the bottom through the first movable door 821 using tools. After completion, the spray device 5 is reset by adjusting the motor 64. At this time, the staff can ascend to the designated height through the stairs or ladder outside the treatment tower 2, open the second movable door 27, add the new packing material 9 to the second spray zone 22, the third spray zone 23, and the fourth spray zone 24, and distribute it evenly using the stirring device 7. By setting up a linkage adjustment mechanism of chain drive and gear meshing, the synchronous tilt control of the multi-stage spray device 5 is realized. When the packing 9 needs to be replaced, only the adjustment motor 64 at the bottom needs to be started, which will drive the spray device 5 of each layer to tilt downward synchronously through the transmission chain 63, thereby forming a discharge gap between the spray components on the same horizontal plane. The waste packing 9 of each layer will quickly slide to the bottom of the tower for unified collection and discharge by using gravity and stirring. This "linkage tilt discharge" design completely changes the cumbersome process of traditional packing 9 towers that need to be disassembled layer by layer or manually cleaned inside the tower. It greatly shortens the equipment downtime for maintenance, significantly reduces the labor intensity of workers and the safety risks of contact with chemical waste, and realizes efficient, convenient and automated replacement of packing 9.

[0030] like Figure 2 As shown, the processing tower 2 is equipped with a fixed array of limiting blocks 26 for limiting the rotation of the spray device 5. The limiting blocks 26 limit the rotation of the spray device 5, that is, limit the downward rotation angle of the spray device 5. By setting the limiting blocks 26 in the processing tower 2, the extreme angle of downward rotation of the spray device 5 is precisely limited. This not only effectively prevents the spray assembly from rigidly colliding with the inner wall of the tower or the lower structure due to excessive rotation during the tilting unloading process, thus avoiding equipment damage, but also provides a clear stroke endpoint for the adjustment mechanism, preventing the transmission chain 63 and gear from derailing or jamming due to excessive stroke, and ensuring that the packing 9 replacement operation is always carried out within a safe and controllable mechanical range.

[0031] like Figure 10As shown, the stirring device 7 includes a fixed frame 71, a stirring motor 72, a stirring shaft 73, and stirring rods 74. The fixed frame 71 is fixedly installed at the top of the treatment tower 2 and arranged in a cross shape. The fixed frame 71 is used to fix the stirring motor 72 and also allows the sprayed gas to flow out. The stirring motor 72 is fixedly installed between the fixed frames 71, and the stirring motor 72 is used to drive the stirring shaft 73 to rotate. The stirring shaft 73 is fixedly installed at the output end of the stirring motor 72, and the rotation of the stirring shaft 73 drives the stirring rods 74 to rotate. The stirring rods 74 are fixedly installed in an array on the stirring shaft 73 and the stirring rods 74 correspond to the positions of the packing 9. The rotation of the stirring rods 74 flips the packing 9 to achieve a better spraying effect. The spray plate 54 has a through groove coaxial with the stirring shaft 73. The diameter of the through groove is larger than the diameter of the stirring shaft 73. The through groove is used for the stirring shaft 73 to pass through and is used to avoid interference between the spray plate 54 and the stirring shaft 73 when rotating.

[0032] During operation, the stirring motor 72, which is fixedly installed on the top bracket 71 of the treatment tower 2, is started. The power generated by the stirring motor 72 drives the stirring shaft 73 to rotate continuously at a low speed (to prevent the packing from getting stuck and breaking). This, in turn, drives the array of stirring rods 74 fixed on the stirring shaft 73 to rotate synchronously. Since the position of the stirring rods 74 corresponds to the height of each layer of packing 9, the rotating stirring rods 74 directly and continuously mechanically tumble and disturb the packing 9 layers in the tower. This tumbling breaks the static stacking state of the packing 9, forcing the packing 9 to continuously renew the gas-liquid contact surface. While the packing 9 is tumbling, the liquid sprayed by the spray device 5 and the rising waste gas can mix and contact more evenly in the dynamically changing gaps between the packing 9, thereby significantly improving the spray absorption effect. After treatment, the clean gas passes through the gaps between the cross-shaped fixed brackets 71 and finally flows out of the treatment tower 2 smoothly. By installing an active stirring device 7 inside the treatment tower 2, the stirring motor 72 drives the array of stirring rods 74 to continuously mechanically agitate each layer of packing 9. This dynamic disturbance mechanism effectively breaks the static stacking equilibrium of the packing 9, forcing the packing particles to continuously roll and rearrange, thereby updating the gas-liquid contact interface in real time and eliminating reaction dead zones. This not only significantly increases the degree of turbulent mixing of waste gas and spray liquid in the gaps of packing 9, ensuring the uniformity and thoroughness of the reaction, but also significantly improves the overall spray absorption efficiency. Combined with the cross-shaped fixing frame 71 design, it ensures stable power output while also ensuring the smooth discharge of clean gas with low resistance.

[0033] like Figures 1 to 4As shown, the collection device 8 includes a collection funnel 81, a reaction chamber 82, an outlet trough 83, an overflow plate 84, and a collection box 85. The collection funnel 81 is fixedly installed at the bottom of the processing tower 2. The reaction chamber 82 is fixedly installed on the support frame 1. The internal height of the reaction chamber 82 is greater than the height of the collection funnel 81. An outlet trough 83 is opened at the bottom of the reaction chamber 82. The collection box 85 is fixedly installed on the right side of the outlet trough 83, and the overflow plate 84 is fixedly installed inside the collection box 85. By combining the collection funnel 81 with the reaction tank 82, the waste liquid sprayed from the bottom of the tower and the sliding packing 9 are centrally guided and temporarily stored and buffered, providing a secondary settling and reaction space for the gas-liquid reaction products. In particular, the addition of an overflow plate 84 structure in the collection tank 85 utilizes the principle of gravity sedimentation to construct a simple and efficient solid-liquid separation mechanism. This effectively traps heavy crystalline particles or packing 9 debris in the solution in the sedimentation zone in front of the overflow plate 84, allowing only the clear ammonium sulfate solution in the upper layer to overflow and discharge. This not only significantly improves the purity of the recovered solution and facilitates the subsequent evaporation and crystallization process, but also effectively prevents solid impurities from entering the circulation pipeline, reducing the risk of wear and blockage of the transfer pump and pipeline.

[0034] like Figures 1 to 4 As shown, a first movable door 821 for collecting packing 9 is rotatably installed on one side of the reaction tank 82, and a second movable door 27 for placing packing 9 is rotatably installed in an array on the processing tower 2. The second movable door 27 corresponds one-to-one with the spray plate 54. By setting No. 1 movable door 821 and No. 2 movable door 27 on the side wall of the reaction tank 82 and the tower body of the treatment tower 2 respectively, a convenient "entry and exit channel" for the replacement of packing 9 is constructed. Among them, No. 1 movable door 821, in conjunction with the aforementioned automatic unloading structure, makes it easy for operators to clean up and remove the slipped waste packing 9 at the bottom, achieving rapid slag discharge. Meanwhile, No. 2 movable door 27, which corresponds one-to-one with the spray plate 54, allows operators to add fresh packing 9 to a specific spray layer from the outside without disassembling the main structure of the tower. This separate maintenance window design of "centralized discharge at the bottom and fixed-point feeding at the side" greatly simplifies the operation process of replacing packing 9, significantly shortens the downtime of equipment maintenance, and effectively reduces the labor intensity of manual maintenance.

[0035] The overall working process is as follows: During operation, the operator starts the delivery pump 512 of the liquid supply component 51. The first liquid supply component 51 pressurizes and pumps the dilute sulfuric acid solution to the first, second, and third spray zones. The second liquid supply component 51 pumps industrial water to the fourth spray zone 24. The liquid enters the hollow spray plate 54 through the rotating column 53 and is atomized and sprayed out by different types of atomizing nozzles 57. The high-temperature ammonia-containing waste gas enters from the bottom of the tower and passes sequentially through the quenching liquid curtain of the first spray zone 21, the fluidized hollow sphere packing of the second spray zone 22 (9 layers), the Pall ring packing of the third spray zone 23 (9 layers), and the Taylor ring packing of the fourth spray zone 24 (9 layers). During this process, the turbulent acceleration effect of the variable diameter channel 25 and the stirring device are combined. 7. The driving stirring rod 74 continuously agitates each layer of packing 9 to update the gas-liquid contact surface in real time. The exhaust gas is discharged after multi-stage gradient acid washing neutralization and terminal water washing defoaming. The reaction solution and precipitate are collected in the bottom collection device 8, and overflowed and collected after sedimentation separation through the reaction tank 82 and overflow plate 84. When the equipment has been running for a long time and the packing 9 needs to be replaced, the regulating motor 64 is started. Through the reducer and chain gear transmission, the spray devices 5 of each stage are driven to tilt downwards and open the discharge gap. With the stirring action, the waste packing 9 slides to the bottom of the tower and is collected and taken out through the first movable door 821. After the spray device 5 is reset, the staff completes the layered injection of the new packing 9 through the second movable door 27 on the side wall of the tower.

[0036] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An ammonia gas treatment device for ammonium chloride evaporation and crystallization, characterized in that, The system includes a support frame (1), a treatment tower (2), an air inlet (3), an air outlet (4), a spray device (5), an adjustment device (6), a stirring device (7), and a collection device (8). The support frame (1) is fixed, and the treatment tower (2) is fixedly installed on top of the support frame (1). The treatment tower (2) has an air inlet (3) at its bottom and an air outlet (4) at its top. The treatment tower (2) is equipped with an array of spray devices (5), and the spray devices (5) are filled with packing material (9) to ensure that the spray liquid and the waste gas are in full contact. The device (5) is used for graded spraying according to the flow path of the exhaust gas; the adjustment device (6) is installed outside the spraying device (5), and the adjustment device (6) is used to adjust the tilt angle of the spraying device (5) to realize the replacement of the packing (9); the stirring device (7) is fixedly installed inside the treatment tower (2), and the stirring device (7) is used to stir the packing (9) to further make the packing (9) contact with the exhaust gas; the collection device (8) is fixedly installed at the bottom of the treatment tower (2), and the collection device (8) is used to collect the treated solution.

2. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 1, characterized in that, The spraying device (5) includes a liquid supply component (51), an installation groove (52), a rotating column (53), a spray plate (54), a liquid inlet (55), a vent hole (56), and an atomizing nozzle (57). The liquid supply component (51) is fixedly installed on one side of the processing tower (2). The processing tower (2) has an array of installation grooves (52) arranged symmetrically within the processing tower (2). The rotating column is rotatably installed within the installation groove (52). The spray plate (54) is fixedly installed on the installation column, and the spray plate (54) and the installation column are integrally formed hollow structures. The spray plate (54) has an array of vent holes (56), and an atomizing nozzle (57) is installed between the vent holes (56). The end of the installation column has a liquid inlet (55), and the liquid supply component (51) is connected to the liquid inlet (55).

3. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 2, characterized in that: The liquid supply assembly (51) includes a liquid storage tank (511), a liquid pump (512), a first liquid supply pipe (513), and a second liquid supply pipe (514). The liquid storage tank (511) is fixedly installed on one side of the treatment tower (2). The liquid pump (512) is fixedly installed on the liquid storage tank (511). The first liquid supply pipe (513) is fixedly installed on the liquid pump (512). The second liquid supply pipe (514) is installed on the first liquid supply pipe (513). The second liquid supply pipe (514) is connected to the mounting column through the liquid inlet (55) to complete the liquid supply. The liquid supply assembly (51) has two sets, namely the first liquid supply assembly (51) and the second liquid supply assembly (51). The first liquid supply assembly (51) delivers dilute sulfuric acid solution into the spray device (5), and the second liquid supply assembly (51) delivers industrial water into the spray device (5).

4. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 3, characterized in that: The spray devices (5) are arranged in pairs of four groups, and the spray devices (5) divide the interior of the treatment tower (2) into a first spray zone (21), a second spray zone (22), a third spray zone (23), and a fourth spray zone (24). The diameter of the second infusion pipe (514) in the first spray zone (21) is DN80; the diameter of the second infusion pipe (514) in the second spray zone (22) is DN65; the diameter of the second infusion pipe (514) in the third spray zone (23) is DN65. 4) The pipe diameter is DN50; the filler (9) in the second spray zone (22) is hollow sphere filler, placed above the spray device (5) in the first spray zone (21); the filler (9) in the third spray zone (23) is Pall ring filler, placed above the spray device (5) in the second spray zone (22); the filler (9) in the fourth spray zone (24) is Taylor ring filler, placed above the spray device (5) in the third spray zone (23).

5. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 4, characterized in that: The second spray zone (22) is provided with a variable diameter channel (25) to increase the air velocity in the second spray zone (22) to enhance turbulent mixing. The internal cross-section of the variable diameter channel (25) is a Venturi tube structure.

6. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 5, characterized in that: The regulating device (6) includes a regulating chamber (61), a rotating gear (62), a transmission chain (63), and a regulating motor (64). The regulating chamber (61) is symmetrically installed on one side of the processing tower (2). The rotating gear (62) is arranged in an array inside the regulating chamber (61). The rotating gear (62) is fixedly installed on the rotating column (53) located in the first spray zone (21), the second spray zone (22), and the third spray zone (23). The rotating gear (62) is meshed with the transmission chain (63). The regulating motor (64) is fixedly installed on the rotating column (53) at the bottom.

7. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 6, characterized in that: The processing tower (2) is fixedly arrayed with limiting blocks (26) for limiting the rotation of the spray device (5).

8. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 7, characterized in that: The stirring device (7) includes a fixed frame (71), a stirring motor (72), a stirring shaft (73), stirring rods (74), and a through groove. The fixed frame (71) is fixedly installed on the top of the processing tower (2) and is arranged in a cross shape. The stirring motor (72) is fixedly installed between the fixed frames (71). The stirring shaft (73) is fixedly installed at the output end of the stirring motor (72). The stirring rods (74) are fixedly installed in an array on the stirring shaft (73) and the stirring rods (74) are positioned corresponding to the packing (9). A through groove coaxial with the stirring shaft (73) is opened on the spray plate (54). The diameter of the through groove is larger than the diameter of the stirring shaft (73).

9. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 8, characterized in that: The collection device (8) includes a collection funnel (81), a reaction chamber (82), an outlet trough (83), an overflow plate (84), and a collection box (85). The collection funnel (81) is fixedly installed at the bottom of the processing tower (2). The reaction chamber (82) is fixedly installed on the support frame (1). The internal height of the reaction chamber (82) is greater than the height of the collection funnel (81). An outlet trough (83) is opened at the bottom of the reaction chamber (82). The collection box (85) is fixedly installed on the right side of the outlet trough (83), and an overflow plate (84) is fixedly installed inside the collection box (85).

10. The ammonia gas treatment equipment for ammonium chloride evaporation and crystallization according to claim 9, characterized in that: The reaction chamber (82) is rotatably installed on one side with a first movable door (821) for collecting packing material (9), and the processing tower (2) is rotatably installed with a second movable door (27) for placing packing material (9), and the second movable door (27) corresponds one-to-one with the spray plate (54).

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