Spray washing system and method for treating ammonium chloride crystals in molecular sieve roasting tail gas

Abstract

The invention discloses a spray washing and spraying system and method for treating ammonium chloride crystals in molecular sieve roasting tail gas, the spray washing and spraying system comprises a spray washing and spraying cooling chamber, the spray washing and spraying cooling chamber comprises a shell, the shell is internally provided with a spray washing and spraying assembly, the shell is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are communicated with the spray washing and spraying assembly. The gas inlet is connected to a tail gas output end of the molecular sieve roasting furnace; the spraying and washing assembly is used for spraying micron-sized fog drops into the shell, and the spraying direction of the micron-sized fog drops is opposite to the direction of airflow formed by the air inlet and the air outlet. The invention aims to reduce the generation of ammonium chloride crystals and weaken the influence of under-scale corrosion and erosion corrosion on equipment pipelines in the crystallization process.

Description

Technical Field

[0001] The invention belongs to the technical field of molecular sieve roasting tail gas treatment in petrochemical industry, and specifically relates to a spray washing system and method for treating ammonium chloride crystals in molecular sieve roasting tail gas. Background Art

[0002] Due to the lack of oil and gas, the current refinery refines low-quality crude oil containing impurities such as N and Cl. During the process, N and Cl elements will react with H 2 The reaction generates NH 3 and HC1, along with the cooling and separation of the process stream, the HC1 in the gas phase and the NH 3 Will react to form NH 4 C1 crystals. Crystal particles are affected by ambient temperature and humidity, and will deliquesce or form corrosive salt solutions, thus corroding related equipment. The electrochemical corrosion of the tube bundle caused by the acidic corrosive medium dissolved in the liquid phase, accompanied by the scouring of multiphase flow, causes serious fluid scouring corrosion, leading to unplanned shutdown of the device, and once corrosion occurs, it will occur repeatedly, which is very unfavorable to safe production.

[0003] The current treatment methods mainly include source control and end-of-pipe treatment. First, part of the problem of ammonium chloride crystallization comes from the conversion of N and Cl in the raw materials into HCl and NH after hydrogenation reaction. 3, both can generate ammonium chloride under low temperature (about 30℃), and the initial crystallization temperature of ammonium salt is generally proportional to the mass fraction of N and Cl in the raw materials and the square of the system pressure. The higher the N and Cl content of the raw materials, the higher the initial temperature of ammonium salt crystallization deposition, the greater the possibility of crystallization, and the wider the crystallization temperature range. Therefore, in order to reduce the blockage and corrosion caused by ammonium salt crystallization, some scholars have found that the N and Cl elements carried in the raw materials can be reduced by adding denitrification and dechlorination tanks, thereby achieving the purpose of greatly reducing the generated ammonium chloride crystals. If the dechlorination agent used has poor performance, ammonium salt crystals will appear in the heat exchanger in more than a month, and water injection treatment is required. The second type, due to the limitations of petrochemical processes, the control measures for the problem of ammonium chloride crystallization are mainly concentrated on terminal treatment. After the ammonium chloride is cooled and crystallized, the generated ammonium salt crystals are removed by heating sublimation, pulse fluctuation, water injection dissolution, and adding corrosion inhibitors to prevent them from clogging and corroding pipeline equipment. However, when water is injected and dissolved, the water injection volume and injection time need to be controlled to avoid partial dissolution of ammonium chloride due to insufficient water, causing acid erosion and corrosion. The sublimation temperature of ammonium salt is 350℃. If it only crystallizes in a local pipe section, the ammonium salt can be converted into gas by heating and sublimation, but it will still crystallize after cooling. For the crystallization temperature range of ammonium salt, it is also possible to avoid the crystallization temperature range of ammonium salt by strengthening heating and insulation, slowing down or even preventing the crystallization of ammonium salt. Pulse injection uses the change of valve size to cause the change of flow rate, thereby impacting the ammonium salt crystallization, so that it scatters into small pieces and does not block the pipeline. Water injection is a convenient and very effective process protection measure to break dew point corrosion and corrosion under the scale of ammonium salt crystal deposition. When injecting water to dissolve, the water quality and water volume of the injected water must be guaranteed. The injected water should avoid containing HCN and oxygen that can promote the aggravation of corrosion. It is best to use desalted water and purified water; the amount of water injected should be guaranteed to contain 25% liquid water to flush the ammonium chloride crystals. At the same time, the water injection point should be changed frequently to ensure the normal operation of the process and avoid damage to the equipment caused by water injection.

[0004] In summary, in traditional treatment methods, many scholars have proposed that when the raw materials contain N and Cl elements, it is best to use dechlorination tanks, denitrification absorbents and other methods to treat from the source. If it is inconvenient to treat from the source due to process limitations, targeted treatment is carried out after the ammonium chloride crystals are generated. The most commonly used method is high-pressure water injection dissolution and heating to make the ammonium chloride crystals sublime. However, these tail-end treatment methods have great disadvantages. Insufficient water injection during water injection dissolution will cause under-scale corrosion problems. The scouring and corrosion caused by long-term water injection will shorten the service life of pipeline instruments. The heated and sublimated ammonium chloride gas will also generate crystals at the back end, and the problem of ammonium chloride crystals has not been truly solved. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a spray washing system and method for treating ammonium chloride crystals in molecular sieve roasting tail gas, the purpose of which is to reduce the generation of ammonium chloride crystals and weaken the influence of under-scale corrosion and scour corrosion on equipment pipelines during the crystallization process.

[0006] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0007] According to a first aspect of the present invention, there is provided a spray washing system for treating ammonium chloride crystals in exhaust gas from molecular sieve roasting, comprising a spray washing cooling chamber, the spray washing cooling chamber comprising a shell, a spray washing assembly being arranged in the shell, an air inlet and an air outlet being arranged on the shell, the air inlet being connected to an exhaust gas output end of a molecular sieve roasting furnace; the spray washing assembly being used for spraying micron-sized droplets into the shell, and a spraying direction of the micron-sized droplets is opposite to an air flow direction formed by the air inlet and the air outlet.

[0008] In a possible implementation of the first aspect, the spray washing assembly includes a high-pressure gas delivery pipe, a spray liquid delivery pipe and a nozzle, the high-pressure gas delivery pipe and the spray liquid delivery pipe are arranged in the shell, and the nozzle is provided with a high-pressure gas inlet and a spray liquid inlet, the high-pressure gas delivery pipe is connected to the high-pressure gas inlet, and the spray liquid delivery pipe is connected to the spray liquid inlet.

[0009] In a possible implementation of the first aspect, a plurality of groups of the spray washing assemblies are arranged in the shell at intervals along the vertical direction, and each group of the spray washing assemblies includes a plurality of the nozzles located at the same height.

[0010] In a possible implementation of the first aspect, the spray washing assembly also includes an air compressor and a water tank, and the air compressor and the water tank are arranged outside the shell, the air compressor is connected to the high-pressure air delivery pipe, and the water tank is connected to the spray liquid delivery pipe.

[0011] In a possible implementation manner of the first aspect, the air inlet is arranged on a side wall of the shell near the bottom, the air outlet is arranged at the top of the shell, and the spray end of the nozzle faces downward.

[0012] In a possible implementation manner of the first aspect, the particle size of the micron-sized droplets is less than 10 μm.

[0013] In a possible implementation manner of the first aspect, the spray washing system further includes an exhaust gas treatment unit, and an input end of the exhaust gas treatment unit is connected to the gas outlet.

[0014] In a possible implementation manner of the first aspect, the spray washing system further includes an induced draft fan, an inlet of the induced draft fan is connected to the air outlet, and an outlet of the induced draft fan is connected to an input end of the exhaust gas treatment unit.

[0015] In a possible implementation manner of the first aspect, the air inlet is connected to the tail gas output end of the molecular sieve roasting furnace through a first pipe, and the inlet of the induced draft fan is connected to the air outlet through a second pipe.

[0016] According to a first aspect of the present invention, a spray washing method for treating ammonium chloride crystals in molecular sieve roasting tail gas is provided, using the spray washing system, comprising:

[0017] The tail gas from the tail gas output end of the molecular sieve roasting furnace is input into the shell through the air inlet, and micron-sized droplets are sprayed into the shell through the spray washing component. The sprayed micron-sized droplets are in reverse contact with the tail gas entering the shell to perform a physical and chemical reaction, and the treated tail gas is discharged through the air outlet.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The present invention provides a spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas. The high-temperature ammonium chloride gas in the molecular sieve roasting furnace purge tail gas enters the spray washing cooling chamber through the air inlet before being cooled to the crystallization temperature. The spray washing component sprays micron-sized droplets into the shell to form a spray cooling and supersaturation environment. The spraying direction of the micron-sized droplets is opposite to the air flow direction formed by the air inlet and the air outlet. The high-temperature ammonium chloride gas contacts the micron-sized droplets in the shell in reverse before reaching the crystallization temperature to perform a physical and chemical reaction, and rapidly cools down under the spray cooling and supersaturation environment, thereby crystallizing and nucleating. After the micron-sized droplets capture the small particles of ammonium chloride crystals, they will undergo a dissolution reaction with the ammonium chloride, thereby avoiding the problem of clogging. While forming small ammonium chloride droplets, the volume and weight of the ammonium chloride droplets will also be increased, thereby reducing its fluid drag and separating it from the molecular sieve roasting furnace purge tail gas, thereby completing the treatment of the ammonium chloride gas in the molecular sieve roasting furnace purge tail gas.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of a spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a spray washing cooling chamber in a spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to an embodiment of the present invention;

[0024] Figure 3 The present invention is a schematic diagram of a nozzle in a spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to an embodiment of the present invention.

[0025] In the figure: 1- spray washing cooling chamber; 10- shell; 11- spray washing assembly; 110- high-pressure gas delivery pipe; 111- spray liquid delivery pipe; 112- nozzle; 1120- high-pressure gas inlet; 1121- spray liquid inlet; 113- air compressor; 114- water tank; 12- air inlet; 13- air outlet; 2- molecular sieve roasting furnace; 3- tail gas treatment unit; 4- induced draft fan; 5- first pipeline; 6- second pipeline. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Combination Figure 1 and Figure 2 As shown, a spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas comprises a spray washing cooling chamber 1, the spray washing cooling chamber 1 comprises a shell 10, a spray washing assembly 11 is arranged in the shell 10, an air inlet 12 and an air outlet 13 are arranged on the shell 10, and the air inlet 12 is connected to the tail gas output end of the molecular sieve roasting furnace 2. The spray washing assembly 11 is used to spray micron-sized droplets into the shell 10, and the spraying direction of the micron-sized droplets is opposite to the air flow direction formed by the air inlet 12 and the air outlet 13.

[0028] The present invention is different from the traditional way of dealing with the problem of ammonium chloride crystallization. In this embodiment, the ammonium chloride gas in the tail gas of the roasting furnace is not treated after the ammonium chloride crystals are generated, but the ammonium chloride gas in the tail gas of the roasting furnace is efficiently removed after passing through the system, so that the ammonium chloride crystallization phenomenon does not occur in the rear-end pipeline, and the pipeline blockage and corrosion problems caused by the ammonium chloride crystallization problem are solved. Specifically, the high-temperature ammonium chloride gas in the tail gas of the molecular sieve roasting furnace enters the spray washing cooling chamber through the air inlet before being cooled to the crystallization temperature. The spray washing component sprays micron-sized droplets into the shell to form a spray cooling and supersaturation environment. The spray direction of the micron-sized droplets is opposite to the air flow direction formed by the air inlet and the air outlet. The high-temperature ammonium chloride gas contacts the micron-sized droplets in the shell in reverse before reaching the crystallization temperature to carry out a physical and chemical reaction, and is rapidly cooled in the spray cooling and supersaturation environment, thereby crystallizing and nucleating. After the micron-sized droplets capture the small crystalline particles of ammonium chloride, they will undergo a dissolution reaction with the ammonium chloride, thus avoiding the problem of clogging. While forming small ammonium chloride droplets, the volume and weight of the ammonium chloride droplets will also be increased, thereby reducing their fluid drag and separating them from the molecular sieve roaster exhaust gas, thus completing the treatment of ammonium chloride gas in the molecular sieve roaster exhaust gas.

[0029] In one embodiment, if Figure 2 and Figure 3 As shown, the spray washing assembly 11 includes a high-pressure gas delivery pipe 110, a spray liquid delivery pipe 111 and a nozzle 112. The high-pressure gas delivery pipe 110 and the spray liquid delivery pipe 111 are arranged in the housing 10. The nozzle 112 is provided with a high-pressure gas inlet 1120 and a spray liquid inlet 1121. The high-pressure gas delivery pipe 110 is connected to the high-pressure gas inlet 1120, and the spray liquid delivery pipe 111 is connected to the spray liquid inlet 1121. For example, the nozzle is composed of a central nozzle and a plurality of small holes. The top of the nozzle is provided with a high-pressure gas inlet, and the side wall is provided with a spray liquid inlet. The central nozzle adopts a circular hole for releasing a high-speed liquid flow. The small holes are located around the central nozzle and are used to disperse the sprayed liquid into tiny droplets. According to actual engineering experience, the water-gas ratio is set to 1:300. At this time, the particle size of the micro-mist droplets formed is less than 10 microns, which is easy to form a spray cooling and supersaturation environment, and the treatment effect is better.

[0030] like Figure 2 As shown, preferably, a plurality of spray washing assemblies 11 are arranged in the shell 10 at intervals along the vertical direction, and each spray washing assembly 11 includes a plurality of nozzles 112 located at the same height. For example, the shell 10 is a circular column tower body, and the spray tower body is a multi-layer structure, and each layer is connected by a flange seal.

[0031] In one embodiment, if Figure 2As shown, the spray washing assembly 11 also includes an air compressor 113 and a water tank 114 , which are arranged outside the shell 10 , the air compressor 113 is connected to the high-pressure air delivery pipe 110 , and the water tank 114 is connected to the spray liquid delivery pipe 111 .

[0032] like Figure 1 and Figure 2 As shown, in one embodiment, the air inlet 12 is arranged on the side wall of the housing 10 near the bottom, the air outlet 13 is arranged on the top of the housing 10, and the spray end of the nozzle 112 faces downward.

[0033] Preferably, the particle size of the micron-sized droplets is less than 10 μm.

[0034] like Figure 1 As shown, based on the above embodiment, as an embodiment, the spray washing system further includes a tail gas treatment unit 3, and the input end of the tail gas treatment unit 3 is connected to the gas outlet 13. Specifically, the tail gas treatment unit 3 further treats the harmful gas in the tail gas purged from the molecular sieve roasting furnace to prevent it from being discharged into the atmosphere.

[0035] Preferably, the spray washing system further comprises an induced draft fan 4, the inlet of the induced draft fan 4 is connected to the air outlet 13, and the outlet of the induced draft fan 4 is connected to the input end of the tail gas treatment unit 3. The tail gas purged from the roasting furnace enters the spray washing cooling chamber 1 through the air inlet 12 under the negative pressure environment formed by the induced draft fan 4, wherein the high-temperature ammonium chloride gas contacts the ultrafine spray in the spray washing cooling chamber 1 in reverse before reaching the crystallization temperature to perform a physical and chemical reaction, completing the interception process, and after the tail gas treatment is completed, it is discharged through the top air outlet 13 of the spray washing cooling chamber 1 to enter the tail gas treatment unit of the next stage.

[0036] In one embodiment, if Figure 1 As shown, the air inlet 12 is connected to the tail gas output end of the molecular sieve roasting furnace 2 through a first pipe 5, and the inlet of the induced draft fan 4 is connected to the air outlet 13 through a second pipe 6. It should be noted that the first pipe 5 is a short-distance pipe.

[0037] In the present embodiment, the high-temperature ammonium chloride gas in the purge tail gas of the molecular sieve roasting furnace enters the spray washing cooling chamber through the first pipeline and the air inlet before being cooled to the crystallization temperature. The spray washing assembly sprays micron-sized droplets into the shell to form a spray cooling and supersaturation environment. First, the washing cooling process of the high-temperature ammonium chloride gas occurs in the first stage. Since the droplet particle size specific surface area and surface energy in the shell are very large, the ammonium chloride gas can be effectively cooled by virtue of the large specific surface area during the mixing process with the flue gas. Since the growth rate of ammonium chloride crystals is relatively fast, the faster cooling rate in the shell can greatly accelerate the crystal growth rate in the initial stage of ammonium chloride crystallization, and it will also be accompanied by the intensification of secondary processes such as crystal crushing and nucleation, and the phase transformation from gas phase to solid phase will occur rapidly. In addition, since ammonium chloride belongs to the Class II system, the crystallization nucleation and growth rate in the supersaturated environment are very fast, and there is no residual supersaturation. Therefore, during the short residence time of the purge tail gas, the ammonium chloride gas generates small ammonium chloride crystal particles due to the crystallization reaction. In the second stage, after the micron-sized droplets in the shell capture the small crystalline particles of ammonium chloride, they will undergo a dissolution reaction with the ammonium chloride to form small ammonium chloride droplets while increasing the volume and weight of the ammonium chloride droplets, thereby reducing their fluid drag and separating them from the purge exhaust gas, completing the treatment of the ammonium chloride gas in the purge exhaust gas.

[0038] It can be obtained from the field measured data that the removal efficiency of ammonium chloride in the tail gas purging at different temperatures is above 89% under different atomization parameters in the shell. Among them, under the condition of flue gas temperature of 240°, the system's removal efficiency of ammonium chloride components can reach up to 96%.

[0039] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas, characterized in that: The invention comprises a spray washing cooling chamber (1), wherein the spray washing cooling chamber (1) comprises a shell (10), wherein a spray washing assembly (11) is arranged inside the shell (10), wherein an air inlet (12) and an air outlet (13) are arranged on the shell (10), wherein the air inlet (12) is connected to an exhaust gas output end of a molecular sieve roasting furnace (2); the spray washing assembly (11) is used for spraying micron-sized droplets into the shell (10), and the spraying direction of the micron-sized droplets is opposite to the airflow direction formed by the air inlet (12) and the air outlet (13).

2. The spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 1, characterized in that: The spray washing assembly (11) comprises a high-pressure gas delivery pipe (110), a spray liquid delivery pipe (111) and a nozzle (112); the high-pressure gas delivery pipe (110) and the spray liquid delivery pipe (111) are arranged in the housing (10); a high-pressure gas inlet (1120) and a spray liquid inlet (1121) are arranged on the nozzle (112); the high-pressure gas delivery pipe (110) is connected to the high-pressure gas inlet (1120), and the spray liquid delivery pipe (111) is connected to the spray liquid inlet (1121).

3. A spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 2, characterized in that: A plurality of groups of the spray washing components (11) are arranged in the housing (10) at intervals in the vertical direction, and each group of the spray washing components (11) comprises a plurality of nozzles (112) located at the same height.

4. The spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 2, characterized in that: The spray washing assembly (11) further comprises an air compressor (113) and a water tank (114); the air compressor (113) and the water tank (114) are arranged outside the housing (10); the air compressor (113) is connected to the high-pressure air delivery pipe (110); and the water tank (114) is connected to the spray liquid delivery pipe (111).

5. The spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 2, characterized in that: The air inlet (12) is arranged on the side wall of the shell (10) near the bottom, the air outlet (13) is arranged at the top of the shell (10), and the spray end of the nozzle (112) faces downward.

6. The spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 1, characterized in that: The particle size of the micron-sized droplets is less than 10 μm.

7. The spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 1, characterized in that: The spray washing system further comprises an exhaust gas treatment unit (3), wherein an input end of the exhaust gas treatment unit (3) is connected to the exhaust port (13).

8. A spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 7, characterized in that: The spray washing system also includes an induced draft fan (4), the inlet of the induced draft fan (4) is connected to the air outlet (13), and the outlet of the induced draft fan (4) is connected to the input end of the exhaust gas treatment unit (3).

9. A spray washing system for treating ammonium chloride crystals in molecular sieve roasting tail gas according to claim 8, characterized in that: The air inlet (12) is connected to the tail gas output end of the molecular sieve roasting furnace (2) via a first pipeline (5), and the inlet of the induced draft fan (4) is connected to the air outlet (13) via a second pipeline (6).

10. A spray washing method for treating ammonium chloride crystals in molecular sieve roasting tail gas, characterized in that: The spray washing system according to any one of claims 1 to 9 comprises: The tail gas from the tail gas output end of the molecular sieve roasting furnace (2) is input into the shell (10) through the air inlet (12), and micron-sized droplets are sprayed into the shell (10) through the spray washing component (11). The sprayed micron-sized droplets are in reverse contact with the tail gas entering the shell (10) to perform a physical and chemical reaction, and the treated tail gas is discharged through the air outlet (13).

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