Reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas

Abstract

The utility model relates to a reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas, which comprises a reactor body, the reactor body sequentially comprises an absorption area and a crystallization area from top to bottom, and the crystallization area is communicated with the absorption area; a tail gas outlet is formed in the top end of the absorption area, and a crystal mush outlet is formed in the bottom end of the crystallization area; an ammonia-containing waste gas inlet is formed in the absorption area, the ammonia-containing waste gas inlet is downwards inclined relative to the reactor body, and the downwards inclined angle between the ammonia-containing waste gas inlet and the reactor body is 5-30 degrees. The reactor for preparing ammonium sulfate through resource recovery of ammonia-containing waste gas is high in integration level and small in size, realizes separation of an absorption area and a crystallization area in a single reactor, realizes resource recovery of high-concentration ammonia-containing waste gas into ammonium sulfate, improves the quality of ammonium sulfate products, is high in ammonia recovery rate, solves the problem of blockage of a solid-containing and crystal-containing reactor, and is suitable for industrial production. No waste gas, waste liquid or waste solid is discharged in the treatment process, and long-period stable operation of the device is realized.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry environmental protection, in particular to a reactor for resource recovery of ammonia-containing waste gas to prepare ammonium sulfate in the field of wastewater treatment. Background Art

[0002] In the production processes of chemical plants and environmental protection devices such as ammonia synthesis, gold ore dressing agent synthesis, sour water stripping, and phenol ammonia recovery, ammonia-containing waste gas with different concentrations will be generated. The composition is complex, the concentration is high, and the difference is large. It is difficult to recover ammonia-containing waste gas into valuable qualified products, and it is even more difficult to achieve the up-to-standard discharge of the tail gas after treating high-concentration ammonia-containing waste gas. Due to the malodorous characteristics of ammonia, once the discharge exceeds the standard, it will cause serious environmental protection accidents. And the added value of ammonia is relatively high. Therefore, realizing the treatment and resource recovery of ammonia-containing waste gas has significant economic value and environmental protection value.

[0003] The existing ammonia-containing waste gas treatment technologies mainly include physical absorption, chemical absorption, catalytic decomposition, catalytic aerobic decomposition, and biodegradation. However, due to the high concentration of ammonia-containing waste gas ≥ 1% v, the treatment process spans two fields of chemical industry and environmental protection. For example, physical absorption and chemical absorption have long treatment processes, high corrosiveness, and difficult-to-reach tail gas standards. Catalytic decomposition and catalytic aerobic decomposition have high operating temperatures, large fuel gas consumption, and high treatment costs. Biodegradation is difficult to meet the treatment requirements of high-concentration ammonia-containing waste gas, and multiple processes often need to be combined, resulting in problems such as long process chains, large investments, and high operating costs.

[0004] The resource recovery of ammonia-containing waste gas can be recovered in the forms of liquid ammonia, ammonia water, ammonium salts, etc. Due to the absorption equilibrium limitation, when ammonia-containing waste gas is directly absorbed by water to generate ammonia water, the concentration of ammonia water is often low and it is difficult to be directly utilized. Generally, processes such as rectification need to be supported for further concentration or purification to recover high-concentration ammonia water or liquid ammonia. The process is complex, the treatment cost is high, and the ammonia concentration in the tail gas after absorption is still high and it is difficult to meet the discharge standard. Recycling ammonia-containing waste gas into ammonium salts, such as ammonium sulfate, ammonium phosphate, ammonium chloride, ammonium carbonate, etc., has the advantages of short process, complete absorption, high product purity, etc., and the products can be directly applied to agricultural fertilizers.

[0005] Chinese Patent Document CN104689769 discloses an integrated device for treating waste acid to produce ammonium sulfate and its operation method. The integrated device is a tower reactor. From the bottom to the top of the tower, a tower kettle buffer section, a reaction section, an oil-water separation section, an oil extraction section, and a demisting section are sequentially arranged. There is an exhaust port at the top of the tower and a product extraction port at the tower kettle. Coaxial inner sleeves are provided in the tower kettle buffer section, the reaction section, and the oil-water separation section. Ammonia enters through the ammonia pipeline at the tower kettle, reacts with the water inlet of the water pipeline and the waste sulfuric acid pipeline, and the ammonium sulfate solution and the polymerized oil are respectively extracted from the product extraction port of the tower kettle and the polymerized oil extraction port. The integrated device combines the functions of waste acid dilution, reaction, and oil-water separation, solves the disadvantages of large floor area and complex operation in the traditional preparation process, further reduces the production operation cost, and prepares an ammonium sulfate solution with higher purity and better quality to obtain ammonium sulfate crystals meeting the national standards.

[0006] Therefore, it is necessary to propose a reactor for resource recovery of ammonia-containing waste gas to produce ammonium sulfate, which has high integration, small volume, and separates the absorption zone and the crystallization zone in a single reactor. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a reactor for resource recovery of ammonia-containing waste gas to produce ammonium sulfate, which has high integration, small volume, separates the absorption zone and the crystallization zone in a single reactor, realizes the resource recovery of high-concentration ammonia-containing waste gas into ammonium sulfate, improves the quality of ammonium sulfate products, has a high ammonia recovery rate, solves the problem of blockage of the reactor containing solids and crystals, has no waste gas, waste liquid, and waste solid emissions during the treatment process, and realizes the long-term stable operation of the device.

[0008] To solve the above technical problems, the technical solution of the present invention is: The reactor for resource recovery of ammonia-containing waste gas to produce ammonium sulfate includes a reactor body. The reactor body sequentially includes an absorption zone and a crystallization zone from top to bottom, and the crystallization zone is communicated with the absorption zone. A tail gas outlet is provided at the top end of the absorption zone, and a slurry outlet is provided at the bottom end of the crystallization zone. An ammonia-containing waste gas inlet is provided on the absorption zone. The ammonia-containing waste gas inlet is inclined downward relative to the reactor body, and the downward inclination angle with the reactor body is 5-30°.

[0009] With the above technical solution, the reactor is of a vertical structure, with an absorption zone at the upper part and a crystallization zone for crystal growth, purification and separation at the lower part. It is arranged that the ammonia-containing waste gas enters the reactor body from the ammonia-containing waste gas inlet at a certain downward inclination angle, and then after colliding and rebounding with the liquid level in the crystallization zone, it rises to the top of the reactor. During the rising process, it countercurrently absorbs and reacts with the circulating absorption liquid containing sulfuric acid sprayed by the multi-layer absorption spray layer in the absorption zone to generate ammonium sulfate. The tail gas after absorption is demisted by a demister and discharged through the tail gas outlet. The reactor for resource recovery of ammonia-containing waste gas to prepare ammonium sulfate controls the solid content of the circulating absorption liquid in an overflow manner, improves the anti-crystallization blockage performance of the equipment, has a high absorption efficiency, and at the same time makes full use of the reaction heat as much as possible to reduce the use of external heat, saving energy and protecting the environment, with stable technology, low investment and operation and maintenance costs. The higher the ammonia concentration in ammonia or ammonia-containing waste gas, the higher the recovery value.

[0010] Preferably, the reactor for resource recovery of ammonia-containing waste gas to prepare ammonium sulfate is provided with a circulation pump. The upper part of the absorption zone is provided with a circulating absorption liquid inlet, and the upper part of the crystallization zone is provided with a circulating absorption liquid outlet. The circulating absorption liquid inlet and the circulating absorption liquid outlet are connected to the circulation pump to form an external circulation. The clear liquid with a low solid content in the upper part of the crystallization zone overflows from the circulating absorption liquid outlet to the outside of the reactor as the circulating absorption liquid, and after being pressurized by the reaction circulation pump and supplemented with sulfuric acid, it is sent to the circulating absorption liquid inlet to enter the multi-layer absorption spray layer for spray absorption.

[0011] Preferably, the reactor for resource recovery of ammonia-containing waste gas to prepare ammonium sulfate is further provided with a elutriation pump. A elutriation spray layer and an elutriation liquid inlet are further arranged in the crystallization zone. The elutriation liquid inlet is communicated with the elutriation spray layer; the circulating absorption liquid outlet is connected to the elutriation liquid inlet through the elutriation pump, and the external circulation liquid of the circulation pump is pressurized by the elutriation pump and enters the elutriation spray layer through the elutriation liquid inlet. An elutriation spray layer is arranged to elute with part of the circulating absorption liquid, and the elutriation circulating liquid is evenly distributed through the elutriation nozzles, so as to control the precipitation of larger ammonium sulfate particles to the bottom of the crystallization zone, and the smaller ammonium sulfate particles return to the middle and upper parts of the crystallization zone to continue crystal growth; the ratio of the elutriation spray flow rate to the crystal slurry discharge flow rate is 1 to 3.

[0012] Preferably, the circulation pump is connected with a circulation tank, and the circulation tank is respectively connected with the elutriation liquid inlet and the circulating absorption liquid inlet; a plurality of annular tangential elutriation nozzles are arranged in the elutriation spray layer. By arranging a circulation tank for buffering, part of the circulating absorption liquid is extracted from the circulation tank, pressurized by the arranged elutriation pump and sent to the elutriation liquid inlet to enter the elutriation spray layer. The elutriation nozzles are evenly distributed, and the elutriation nozzles are inclined downward towards the center, so as to form a stable upward floating fluid, and the large and small crystal nuclei of ammonium sulfate are floated upward from the center, the large crystal nuclei sink, and the small crystal nuclei float upward.

[0013] Preferably, a reduced-diameter section is provided between the crystallization zone and the absorption zone, and the diameter ratio of the crystallization zone to the absorption zone is 1.2 to 1.4; the head at the bottom of the crystallization zone is an elliptical head or a flanged and dished head. Such a setting can enhance the elutriation effect.

[0014] Preferably, a gas distributor is provided at the bottom of the absorption zone, and the gas distributor is located above the inlet of the ammonia-containing waste gas. The gas distributor is provided to disperse and evenly distribute the ammonia-containing waste gas. The gas distributor adopts a large-aperture anti-blocking structure, preferably but not limited to a grille, a sieve plate, a baffle plate, etc.

[0015] Preferably, at least one demister is further provided in the upper part of the absorption zone. The demister is located above the gas distributor, and a manhole 1 is further provided above the demister.

[0016] Preferably, at least one absorption spray layer is provided in the absorption zone. The absorption spray layer is connected to the circulating absorption liquid inlet and is located above the gas distributor, and a manhole 2 is provided below the absorption spray layer. 1 to 6 absorption spray layers can be provided, so that ammonia gas contacts the circulating absorption liquid containing sulfuric acid countercurrently and is absorbed. By using a spray reactor, ammonia gas contacts the circulating absorption liquid containing sulfuric acid countercurrently and is absorbed. The number of spray layers in the absorption zone is designed according to the inlet ammonia concentration and can be 1 to 6 layers. The design freedom is high, and the absorption efficiency can be precisely controlled.

[0017] Preferably, the angle of inclination downward between the inlet of the ammonia-containing waste gas and the reactor body is 15 to 20°.

[0018] Preferably, at least one thermometer port, at least one densitometer port, at least one remote transmission liquid level gauge port, at least one sight glass, at least one pH meter port and a spare port are provided in the crystallization zone. As required, the thermometer port, the remote transmission liquid level gauge port, the sight glass, the pH meter port, the spare port and the manhole are provided above or / and below the demister and the spray layer, which is convenient for manual cleaning and the maintenance of internal components.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] (1) It can treat ammonia-containing waste gas with an ammonia concentration of 1%v to 100%v, and the ammonia recovery rate can reach more than 98%, and even can reach more than 99.9%. According to the different sources and impurity components of the ammonia-containing waste gas, a pretreatment device can be set up. The pretreatment device includes but is not limited to dust removal, pre-washing, heating or cooling, etc., to meet the normal operation of the reactor and the quality of ammonium sulfate products, and has a wide application range;

[0021] (2) The reactor has a reasonable structural configuration. It adopts a vertical structure with an absorption zone set in the upper part and a crystallization zone in the lower part. The solid content of the circulating absorption liquid is controlled by an overflow method, enhancing the equipment's strong anti-crystallization and plugging performance, high absorption efficiency. The crystallization zone takes measures to control supersaturation, resulting in good crystal quality, uniform particle size, large particles, and easy concentration and separation. At the same time, the reaction heat is utilized as much as possible to reduce the use of external heat, saving energy and being environmentally friendly. The technology is stable and reliable, with low investment and operation and maintenance costs. The higher the ammonia concentration in ammonia gas or ammonia-containing waste gas, the higher the recovery value;

[0022] (3) The crystallization zone is an area for crystal growth, purification, and separation. It is equipped with a scrubbing spray layer, which uses part of the circulating absorption liquid or mother liquor for scrubbing, flushing the bottom area, maintaining the fluidity of the crystals, removing the fine crystal nuclei on the crystal surface, and forming larger and more regular crystals;

[0023] (4) The scrubbing spray layer is provided with annular tangential nozzles, which are evenly distributed and inclined downward towards the center, so as to form a stable upward floating fluid, floating the large and small crystal nuclei of ammonium sulfate from the center upwards, with the large crystal nuclei sinking and the small crystal nuclei floating;

[0024] (5) The reactor of the present utility model has a novel, safe, and reliable structure and can operate stably for a long time; moreover, the reactor adopted has a simple structure and is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The technical solution of the present utility model will be further described below with reference to the drawings:

[0026] Figure 1 is a schematic structural diagram of the reactor for resource recovery and preparation of ammonium sulfate from ammonia-containing waste gas of the present utility model;

[0027] Wherein: 1 - crystallization zone; 2 - thermometer port; 3 - reduced diameter section; 4 - reactor body; 5 - ammonia-containing waste gas inlet; 6 - gas distributor; 7 - absorption zone; 8 - demister; 9 - tail gas outlet; 10 - manhole one; 11 - absorption spray layer; 12 - circulating absorption liquid inlet; 13 - upper port of remote level gauge; 14 - circulating absorption liquid outlet; 15 - sight glass; 16 - pH meter port; 17 - scrubbing spray layer; 18 - scrubbing liquid inlet; 19 - spare port; 20 - crystal slurry outlet; 21 - head; 22 - density meter port; 23 - lower port of remote level gauge; 24 - manhole two; 25 - sight glass two; 26 - sight glass three. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To deepen the understanding of the present utility model, the present utility model will be further described in detail below with reference to the drawings and embodiments. The embodiments are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0029] Example 1: As Figure 1As shown, the reactor for resource recovery and preparation of ammonium sulfate from ammonia-containing waste gas includes a reactor body 4. The reactor body 4 successively includes an absorption zone 7 and a crystallization zone 1 from top to bottom, and the crystallization zone 1 is communicated with the absorption zone 7. A tail gas outlet 9 is provided at the top of the absorption zone 7, and a crystal slurry outlet 20 is provided at the bottom of the crystallization zone 1. An ammonia-containing waste gas inlet 5 is provided on the absorption zone 7. The ammonia-containing waste gas inlet 5 inclines downward relative to the reactor body 4, and the downward inclination angle with the reactor body 4 is 5-30°. The reactor for resource recovery and preparation of ammonium sulfate from ammonia-containing waste gas is provided with a circulation pump. A circulating absorption liquid inlet 12 is provided in the upper part of the absorption zone 7, and a circulating absorption liquid outlet 14 is provided in the upper part of the crystallization zone 1. The circulating absorption liquid inlet 12 and the circulating absorption liquid outlet 14 are connected to the circulation pump to form an external circulation. The clear liquid with a low solid content in the upper part of the crystallization zone 1 overflows from the circulating absorption liquid outlet to the outside of the reactor as the circulating absorption liquid, and after being pressurized by the reaction circulation pump and supplemented with sulfuric acid, it is sent to the circulating absorption liquid inlet 12 to enter the multi-layer absorption spray layer 11 for spray absorption. The reactor for resource recovery and preparation of ammonium sulfate from ammonia-containing waste gas is also provided with a elutriation pump. An elutriation spray layer 17 and an elutriation liquid inlet 18 are also provided in the crystallization zone 1, and the elutriation liquid inlet 18 is communicated with the elutriation spray layer 17. The circulating absorption liquid outlet 14 is connected to the elutriation liquid inlet 18 through the elutriation pump, and the external circulation liquid of the circulation pump is pressurized by the elutriation pump and enters the elutriation spray layer 17 through the elutriation liquid inlet 18. The elutriation spray layer 17 is provided to elutriate with part of the circulating absorption liquid, and the elutriation circulating liquid is evenly distributed through the elutriation nozzles, so as to control the precipitation of larger particles of ammonium sulfate to the bottom of the crystallization zone, and the smaller particles of ammonium sulfate return to the upper and middle parts of the crystallization zone to continue to crystallize and grow. The ratio of the elutriation spray flow to the crystal slurry discharge flow is 1-3. The circulation pump is connected with a circulation tank, and the circulation tank is respectively connected with the elutriation liquid inlet 18 and the circulating absorption liquid inlet 12. A plurality of annular tangential elutriation nozzles are provided in the elutriation spray layer 17. By setting the circulation tank for buffering, part of the circulating absorption liquid is extracted from the circulation tank, pressurized by the set elutriation pump and sent to the elutriation liquid inlet 18 to enter the elutriation spray layer 17. The elutriation nozzles are evenly distributed, and the elutriation nozzles incline obliquely downward towards the center, so as to form a stable upward floating fluid, and the large and small crystal nuclei of ammonium sulfate are floated upward from the center, the large crystal nuclei sink, and the small crystal nuclei float upward. A reduced-diameter section 3 is provided between the crystallization zone 1 and the absorption zone 7, and the diameter ratio of the crystallization zone 1 to the absorption zone 7 is 1.2-1.4. The head 21 at the bottom of the crystallization zone 1 is an elliptical head or a reduced-opening flat bottom head. A gas distributor 6 is provided at the bottom of the absorption zone 7, and the gas distributor 6 is provided above the ammonia-containing waste gas inlet 5.A gas distributor 6 is provided to disperse and evenly distribute the ammonia-containing waste gas. The gas distributor 6 adopts a large-aperture anti-blocking structure, preferably but not limited to grille, sieve plate, baffle plate, etc.; at least one demister 8 is further provided in the upper part of the absorption zone 7. The demister 8 is arranged above the gas distributor 6, and a first manhole 10 is further arranged above the demister 8; at least one absorption spray layer is arranged in the absorption zone. The absorption spray layer is connected to the circulating absorption liquid inlet and is arranged above the gas distributor, and a second manhole 24 is arranged below the absorption spray layer. The absorption spray layer 11 enables ammonia to be absorbed by countercurrent contact with the circulating absorption liquid containing sulfuric acid. A spray reactor is adopted, and ammonia is absorbed by countercurrent contact with the circulating absorption liquid containing sulfuric acid. The number of the absorption spray layers 11 in the absorption zone is designed according to the ammonia concentration in the inlet gas, and can be 1 to 6 layers. The design freedom is high, and the absorption efficiency can be accurately controlled; at least one thermometer port 2, two remote transmission liquid level gauge ports (respectively the upper remote transmission liquid level gauge port 13 and the lower remote transmission liquid level gauge port 23), three sight glasses (including the first sight glass 15, the second sight glass 25 and the third sight glass 26), two densitometer ports 22, one pH meter 16 port and a spare port 19 are arranged in the crystallization zone 1.

[0030] Example 2: The difference from Example 1 is that the downward inclination angle between the ammonia-containing waste gas inlet 5 and the reactor body 4 is 15-20°.

[0031] The specific steps for the reactor for resource recovery and preparation of ammonium sulfate from ammonia-containing waste gas to recover and prepare ammonium sulfate are as follows:

[0032] The ammonia-containing waste gas enters the absorption zone in the reactor body 4 from the ammonia-containing waste gas inlet 5 at a certain downward inclination angle, and then collides and rebounds with the liquid level in the crystallization zone 1 and rises to the top of the reactor body 4. After being dispersed and evenly distributed by the gas distributor 6, it countercurrently absorbs and reacts with the circulating absorption liquid containing sulfuric acid sprayed by multiple absorption spray layers 11 in the absorption zone during the rising process to generate ammonium sulfate. The tail gas after absorption is demisted by the demister 8 and discharged through the tail gas outlet; the clear liquid with low solid content in the upper part of the crystallization zone 1 overflows from the circulating absorption liquid outlet to the outside of the reactor as the circulating absorption liquid, and after being buffered by setting a circulation tank, pressurized by a reaction circulation pump and supplemented with sulfuric acid, it is sent to the circulating absorption liquid inlet 12 to enter the multiple absorption spray layers 11 for spray absorption. At the same time, part of the circulating absorption liquid is extracted from the circulation tank, pressurized by a elutriation pump and sent to the elutriation liquid inlet 18 to enter the elutriation spray layer 17. The elutriation circulating liquid is evenly distributed by the elutriation nozzles, and the larger particles of ammonium sulfate are controlled to precipitate to the bottom of the crystallization zone 1, and the smaller particles of ammonium sulfate return to the upper and middle parts of the crystallization zone 1 to continue crystal growth. The diameter ratio of the crystallization zone 1 to the absorption zone 7 is 1.2-1.4, and a reduced-diameter section is arranged between the two. The bottom head 21 of the crystallization zone is set as an elliptical head or a reduced-opening flat head to enhance the elutriation effect. The ammonium sulfate crystal slurry containing larger particles at the bottom of the crystallization zone 1 is discharged from the crystal slurry outlet 20 out of the reactor body 4.

[0033] For those of ordinary skill in the art, the specific embodiments only exemplarily describe the present utility model. Obviously, the specific implementation of the present utility model is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model, or the concept and technical solution of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A reactor for recycling ammonia-containing waste gas to prepare ammonium sulfate, characterized in that: It includes a reactor body, which includes an absorption zone and a crystallization zone from top to bottom, and the crystallization zone is connected to the absorption zone; a tail gas outlet is provided at the top of the absorption zone, and a slurry outlet is provided at the bottom of the crystallization zone; an ammonia-containing waste gas inlet is provided on the absorption zone, and the ammonia-containing waste gas inlet is inclined downward relative to the reactor body, and the downward inclination angle between the inlet and the reactor body is 5 to 30 degrees.

2. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 1, characterized in that: The reactor for recycling ammonia-containing waste gas to prepare ammonium sulfate is provided with a circulation pump, the upper part of the absorption zone is provided with a circulating absorption liquid inlet, the upper part of the crystallization zone is provided with a circulating absorption liquid outlet, and the circulating absorption liquid inlet and the circulating absorption liquid outlet are connected to the circulation pump to form an external circulation.

3. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 2, characterized in that: The reactor for recycling ammonia-containing waste gas to prepare ammonium sulfate is also provided with an elutriation pump. The crystallization zone is also provided with an elutriation spray layer and an elutriation liquid inlet, and the elutriation liquid inlet is connected to the elutriation spray layer; the circulating absorption liquid outlet is connected to the elutriation liquid inlet through the elutriation pump, and the external circulating liquid of the circulating pump is pressurized by the elutriation pump and enters the elutriation spray layer through the elutriation liquid inlet.

4. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 3, characterized in that: The circulation pump is connected with a circulation tank, and the circulation tank is respectively connected with the elutriation liquid inlet and the circulation absorption liquid inlet; a plurality of annular tangential elutriation nozzles are arranged in the elutriation spray layer.

5. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 3, characterized in that: A diameter-changing section is provided between the crystallization zone and the absorption zone, and the diameter ratio between the crystallization zone and the absorption zone is 1.2-1.4; the end cap at the bottom of the crystallization zone is an elliptical end cap or a contracted flat-bottom end cap.

6. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 5, characterized in that: A gas distributor is provided at the bottom of the absorption zone, and the gas distributor is arranged above the inlet of the ammonia-containing waste gas.

7. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 6, characterized in that: At least one layer of demister is also provided in the upper part of the absorption zone. The demister is arranged above the gas distributor. A manhole is also provided above the demister.

8. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 7, characterized in that: At least one absorption spray layer is arranged in the absorption zone. The absorption spray layer is connected to the circulating absorption liquid inlet and is arranged above the gas distributor. A second manhole is arranged below the absorption spray layer.

9. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 7, characterized in that: The downward inclination angle between the ammonia-containing waste gas inlet and the reactor body is 15 to 20 degrees.

10. The reactor for preparing ammonium sulfate by recycling ammonia-containing waste gas according to claim 7, characterized in that: The crystallization zone is provided with at least one thermometer port, at least one density meter port, at least one remote liquid level meter port, at least one sight glass, at least one pH meter port and a spare port.

Images