阅读说明：本技术 一种含氨废气回收再利用装置及方法 (Ammonia-containing waste gas recycling device and method ) 是由 周春江 樊建 孙佳庆 于 2020-03-18 设计创作，主要内容包括：本发明提供一种含氨废气回收再利用装置及方法,其装置包括反应塔和析出塔；反应塔靠下端位置设置有氨废气接口,反应塔内设有用于形成碳酸铵溶液的反应池,碳酸与足量的氨气反应生成碳酸铵溶液；反应塔内间隔设置有多个用于喷淋碳酸的喷淋管；析出塔内设有用于形成过饱和碳酸氢氨溶液的析出池,析出池底部是锥形池底,锥形池底的底部设置有析出排放口,反应池的出液口连接析出塔的进液口。本发明通过装置和方法的结合,能够回收尽可能多的废气中的氨气,其获得的碳酸氢氨晶体,易资源化实际应用和销售,省去了传统需要蒸发结晶的问题,利用过饱和析出原理即可实现,不会形成二次固废,经济效益高。(The invention provides a device and a method for recycling ammonia-containing waste gas, wherein the device comprises a reaction tower and an extraction tower; an ammonia waste gas interface is arranged at the position close to the lower end of the reaction tower, a reaction tank for forming an ammonium carbonate solution is arranged in the reaction tower, and carbonic acid reacts with sufficient ammonia gas to generate the ammonium carbonate solution; a plurality of spraying pipes for spraying carbonic acid are arranged in the reaction tower at intervals; the precipitation tower is internally provided with a precipitation tank for forming supersaturated ammonium bicarbonate solution, the bottom of the precipitation tank is a conical tank bottom, the bottom of the conical tank bottom is provided with a precipitation discharge port, and the liquid outlet of the reaction tank is connected with the liquid inlet of the precipitation tower. The device and the method are combined, so that ammonia gas in the waste gas can be recovered as much as possible, the obtained ammonium bicarbonate crystals are easy to realize resource practical application and sale, the traditional problem of evaporation crystallization is solved, the method can be realized by utilizing the supersaturation precipitation principle, secondary solid waste cannot be formed, and the economic benefit is high.)

1. The utility model provides an contain ammonia waste gas recovery and recycle device which characterized in that includes:

the reaction tower group comprises at least one reaction tower (1), an ammonia waste gas interface (2) is arranged at the position, close to the lower end, of the reaction tower (1), and a reaction tank (3) for forming an ammonium carbonate solution is arranged in the reaction tower (1); a plurality of spray pipes (4) are arranged in the reaction tower (1) at intervals, carbonic acid is introduced into the spray pipes (4), the carbonic acid is correspondingly sprayed into the reaction tank (3), and the carbonic acid reacts with ammonia gas in sufficient waste gas to generate ammonium carbonate solution;

the separation tower group comprises at least one separation tower (5), and a separation pool (6) for forming supersaturated ammonium bicarbonate solution is arranged in the separation tower (5); a conical pool bottom (7) is formed at the bottom of the precipitation pool (6), and a precipitation discharge port (8) is formed at the bottom of the conical pool bottom (7); a liquid outlet (16) of the reaction tank (3) is connected with a liquid inlet (17) of the precipitation tower (5);

the carbonic acid generating mechanism comprises a first carbonic acid mechanism used for being connected to the spraying pipe (4) and a second carbonic acid mechanism used for being connected to the precipitation pool (6);

wherein the bottom of the precipitation tower (5) is provided with a reflux outlet (20), and the reaction tower (1) is provided with a reflux inlet (21) communicated with the reflux outlet (20).

2. The ammonia-containing waste gas recycling device according to claim 1, wherein the recycling device is characterized in thatA reflux control valve is installed on a connecting pipeline between the reflux outlet (20) and the reflux inlet (21), and after the concentration of the ammonium bicarbonate solution in the precipitation tank (6) is lower than a set threshold value, the reflux control valve is opened, and the ammonium bicarbonate solution in the precipitation tank (6) is transported into the reaction tank (3) in a reflux manner through a pump; the reaction formula in the reaction tank (3) is as follows: 2NH₃+CO₂+H₂O＝(NH₄)₂CO₃In which NH₃The access amount is sufficient;

the reaction formula in the precipitation pool (6) is as follows: NH (NH)₃+CO₂+H₂O＝NH₄HCO₃Generation of supersaturated NH₄HCO₃To make NH₄HCO₃Crystallizing and precipitating from the precipitation discharge port (8).

3. The ammonia-containing waste gas recycling device according to claim 1, wherein the first carbonic acid mechanism is used for preparing carbonic acid by a pressurized dissolved gas method and comprises a first dissolved carbonic acid gas tank (9) and H arranged on the reaction tower (1)₂O water inlet (10), the first dissolved carbonic acid gas tank (9) comprises first CO₂The device comprises a gas inlet (11) and a first carbonic acid liquid outlet (12), carbonic acid is formed in a first carbonic acid gas dissolving tank (9), the first carbonic acid liquid outlet (12) is connected to a spray pipe (4), and a circulating port (15) of a reaction tank (3) is connected with a circulating pump (13); a first circulation outlet (22) at the bottom of the reaction tank (3) is connected to a first circulation inlet (24) of the first dissolved carbonic acid gas tank (9) through a first dissolved gas pump (23).

4. The ammonia-containing waste gas recycling device according to claim 1, wherein the first carbonic acid means produces carbonic acid by aeration method comprising H disposed on the reaction tower (1)₂O water inlet (10) and first CO₂An air inlet (11), wherein the bottom of the reaction tank (3) is provided with the first CO₂A first aeration pipe (14) connected with the air inlet (11), wherein a circulation port (15) of the reaction tank (3) is connected to the spray pipe (4) through a circulation pump (13), and CO at the position of the first aeration pipe (14)₂And the placeH is described₂H connected with O water inlet (10)₂The O reacts to form carbonic acid.

5. The ammonia-containing waste gas recycling device according to claim 1, wherein the second carbonic acid means produces carbonic acid by an aeration method comprising second CO disposed on the precipitation tank (6)₂An air inlet (18), and the second CO is arranged in the precipitation tank (6)₂A second aeration pipe (19) connected with the air inlet (18).

6. The ammonia-containing exhaust gas recycling device according to claim 1, wherein the second carbonic acid means for producing carbonic acid by a pressurized dissolved gas method comprises a second dissolved carbonic acid gas tank (25), and the second dissolved carbonic acid gas tank (25) is provided with a third CO₂A gas inlet (26) and a second carbonic acid liquid outlet (27), wherein the second carbonic acid liquid outlet (27) is connected to a carbonic acid liquid inlet (28) of the precipitation tower (5);

and a second circulation outlet (29) of the precipitation pool (6) is connected to a second circulation inlet (31) of the second dissolved carbonic acid gas tank (25) through a second dissolved gas pump (30).

7. A method of recycling an exhaust gas containing ammonia by using the exhaust gas containing ammonia recycling apparatus according to claim 1 or 2, comprising the steps of:

s001, introducing ammonia-containing waste gas, introducing the ammonia-containing waste gas into an ammonia waste gas interface (2) of a reaction tower (1), and enabling ammonia gas in the waste gas to enter the tower of the reaction tower (1);

s002, spraying carbonic acid, and preparing ammonium carbonate in the reaction tank; spraying carbonic acid prepared by a first carbonic acid mechanism through a plurality of spraying pipes (4) arranged in the reaction tower (1), and forming ammonium carbonate in a reaction tank (3) of the reaction tower (1);

s003, preparing ammonium bicarbonate in the precipitation tank; the solution in the reaction tank (3) is connected with a liquid inlet (17) of the precipitation tower (5) through a liquid outlet (16), and carbonic acid is introduced into a precipitation tank (6) of the precipitation tower (5) through a second carbonic acid mechanism to prepare and form ammonium bicarbonate;

and step S004, supersaturated crystals are precipitated out of the ammonium bicarbonate, and ammonium bicarbonate crystals are crystallized at the bottom of the conical pool bottom (7) at the bottom of the precipitation pool (6) and precipitated out from the precipitation discharge port (8).

8. The method of claim 7, wherein the reaction formula in the reaction tank (3) in the step S002 is as follows: 2NH₃+CO₂+H₂O＝(NH₄)₂CO₃In which NH₃The access amount is sufficient; the reaction formula in the precipitation tank (6) in the step S003 is as follows: NH (NH)₃+CO₂+H₂O＝NH₄HCO₃The solubility of the ammonium carbonate is higher than that of the ammonium bicarbonate, and a supersaturated ammonium bicarbonate solution is arranged in the precipitation tank (6), so that ammonium bicarbonate crystals are crystallized and precipitated at the bottom of the conical tank bottom (7); in the step S004, when the concentration of the ammonium bicarbonate solution in the precipitation tank (6) is lower than a set threshold, the reflux control valve is opened, and the ammonium bicarbonate solution in the precipitation tank (6) is sent to the reaction tank (3) through the reflux outlet (20) of the precipitation column (5) and the reflux inlet (21) of the reaction column (1) by a pump in a reflux manner.

9. The method according to claim 7, wherein the first carbonic acid mechanism in the step S002 adopts a pressurized dissolved gas method to prepare carbonic acid, and specifically comprises:

step S0021, in H of the first dissolved carbonic acid gas tank (9)₂The O water inlet (10) is connected with H₂O；

Step S0022, first CO in the first dissolved carbonic acid gas tank (9)₂The air inlet (11) is connected with CO₂；

Step S0023, the carbonic acid formed in the first carbonic acid gas dissolving tank (9) is connected to a spray pipe (4) in the reaction tower (1) through a first carbonic acid liquid outlet (12) and is sprayed into the reaction tank (3); the pressure in the first carbonic acid gas dissolving tank (9) is 0.2-0.6 MPa; wherein a first circulation outlet (22) at the bottom of the reaction tank (3) is connected to a first circulation inlet (24) of the first dissolved carbonic acid gas tank (9) through a first dissolved gas pump (23);

the second carbonic acid means in said step S003 produces carbonic acid by aeration through said second CO₂The air inlet (18) leads CO into a second aeration pipe (19) in the precipitation tank (6)₂。

10. The method of claim 7, wherein the first carbonic acid means in step S002 prepares carbonic acid by aeration, and specifically comprises:

step S0021, H in reaction column (1)₂The position of an O water inlet (10) is connected with H₂O；

Step S0022, connecting CO into a first aeration pipe (14) at the bottom of the reaction tank (3)₂；

Step S0023, forming carbonic acid in a reaction tank (3), wherein a circulation port (15) of the reaction tank (3) is connected to the spray pipe (4) through a circulation pump (13) and is sprayed into the reaction tank (3);

the second carbonic acid mechanism in the step S003 is configured to prepare carbonic acid by a pressurized dissolved gas method, and specifically includes: step S0031, sequentially passing through a second circulation outlet (29), a second dissolved air pump (30) and a second circulation inlet (31), and conveying the solution in the precipitation pool (6) to a second dissolved carbonic acid gas tank (25); step S0032, third CO in the second dissolved carbonic acid gas tank (25)₂The gas inlet (26) is connected with CO₂(ii) a And S0033, the solution back-mixed in the second carbonic acid gas dissolving tank (25) is connected to a carbonic acid liquid inlet (28) of the precipitation tower (5) through a second carbonic acid liquid outlet (27), and the solution returns to the precipitation pool (6) to prepare ammonium bicarbonate.

Technical Field

The invention relates to the technical field of chemical equipment, in particular to a device and a method for recycling ammonia-containing waste gas.

Background

With the progress of science and technology and the development of economy, waste gas and waste water are generated and discharged in industries, agriculture, breeding industry and the like all around, and the problem of environmental protection is increasingly prominent.

At present, the excessive discharge of ammonia nitrogen directly influences the environmental protection treatment of waste gas and waste water of chemical enterprises, which becomes a bottleneck restricting the continuous development of enterprises, and the treatment of ammonia nitrogen waste gas and waste water becomes the primary environmental protection problem of related chemical enterprises. In the treatment of ammonia nitrogen waste gas and wastewater, if a traditional stripping and adsorption method is adopted and solutions such as sulfuric acid and hydrochloric acid are used as absorption liquid, the produced ammonium chloride and ammonium sulfate have low added value benefit due to low purity, even cannot be treated outwards, and are easy to generate secondary pollution; for example, the invention relates to a Chinese patent (application number is 201310534904.8) named as a method for treating high-salt high-ammonia nitrogen wastewater, which adopts a process flow of membrane absorption, nanofiltration and forward osmosis. Firstly, taking a sulfuric acid solution as an absorption liquid, and converting ammonia nitrogen in the wastewater into ammonium sulfate by adopting membrane absorption; secondly, further concentrating the ammonium sulfate solution by nanofiltration; then taking the concentrated ammonium sulfate solution as a forward osmosis driving liquid, taking high-salinity wastewater subjected to membrane absorption and ammonia nitrogen removal as a forward osmosis feeding liquid, and performing forward osmosis concentration treatment; after being diluted, the ammonium sulfate solution as the driving liquid is partially returned to the nanofiltration unit for circulating concentration treatment. The sulfuric acid solution is used as the absorption liquid, the converted ammonium sulfate has low utilization value, secondary solid waste is easily formed, the economic benefit of waste water and waste gas treatment of enterprises is influenced, and certain defects exist in combination with cost reasons. Therefore, the research and development of economical, practical and safe ammonia nitrogen treatment equipment and process have important significance for protecting the environment.

Ammonium bicarbonate is a carbonate salt which is a white compound, is in the form of granular, plate or column crystals, and has ammonia odor. The tail gas of power plants and incineration plants needs denitration treatment, urea can be used for hydrolysis and then denitration is carried out, and the preparation of ammonium bicarbonate by carbonic acid is an important outlet for recycling ammonia nitrogen treatment resources. (NH)₄)₂CO₃(ammonium carbonate) has a solubility of about 100g (solvent 100g) at 20 ℃ NH₄HCO₃(ammonium bicarbonate) has a solubility of about 21.7g at 20 ℃ and NH at the same temperature₄HCO₃More easily crystallized and therefore the difference in solubility between the two can be used to generate, first, more soluble (NH)₄)₂CO₃；CO₂Amount of (2)When further increased, NH is formed₄HCO₃And then supersaturated and precipitated to be used as a denitration agent.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a device and a method for recycling ammonia-containing waste gas, and aims to fully absorb ammonia gas in the waste gas, omit the step of evaporation and crystallization and save the device cost, and ammonium bicarbonate obtained by crystallization can be used as a denitration agent, so that secondary solid waste is not formed, and the aim of recycling the waste gas is fulfilled.

(II) technical scheme

In order to solve the above technical problems, the present invention provides an apparatus and a method for recycling ammonia-containing waste gas, wherein the apparatus comprises: the system comprises a reaction tower group, a precipitation tower group and a carbonic acid generation mechanism; the reaction tower group comprises at least one reaction tower, and an ammonia waste gas interface is arranged at the lower end of the reaction tower and used for accessing ammonia-containing tail gas, such as ammonia-containing tail gas blown off by ammonia nitrogen wastewater; a reaction tank for forming an ammonium carbonate solution is arranged in the reaction tower, and carbonic acid reacts with sufficient ammonia gas to generate the ammonium carbonate solution; a plurality of spray pipes for spraying carbonic acid are arranged in the reaction tower at intervals, the spray pipes are connected with the carbonic acid, and the carbonic acid is correspondingly sprayed into the reaction tank; the precipitation tower group comprises at least one precipitation tower, a precipitation pool for forming supersaturated ammonium bicarbonate solution is arranged in the precipitation tower, the bottom of the precipitation pool is formed into a conical pool bottom, the bottom of the conical pool bottom is provided with a precipitation discharge port, and the precipitation tower is provided with a discharge valve at the precipitation discharge port; the liquid outlet of the reaction tank is connected with the liquid inlet of the precipitation tower; the carbonic acid generating mechanism comprises a first carbonic acid mechanism used for being connected to the spraying pipe and a second carbonic acid mechanism used for being connected to the precipitation pool; wherein, the bottom of the precipitation tower is provided with a reflux outlet, and the reaction tower is provided with a reflux inlet communicated with the reflux outlet. The absorption liquid of the device is carbonic acid and enters the reaction tank in a spraying mode; the solubility of ammonium carbonate is greater than that of ammonia bicarbonate, and thus first in the said reactionAbsorbing ammonia in the waste gas as much as possible in the tower to form ammonium carbonate solution; secondly, the ammonium carbonate solution is connected with the liquid inlet of the precipitation tower through the liquid outlet, and CO is introduced into the precipitation pool of the precipitation tower₂Further forming supersaturated ammonium bicarbonate solution, crystallizing ammonium bicarbonate and discharging from a precipitation discharge port at the bottom of the conical pool; the ammonium bicarbonate crystals at the precipitated discharge outlet can be output to the outside through the screw conveyor, and the recovered ammonium bicarbonate crystals can be applied to a denitration process of a power plant, so that the method is extremely favorable for how to treat the recovered ammonia gas.

Furthermore, the backflow outlet and the connecting pipeline of the backflow inlet are provided with backflow control valves, after the concentration of the ammonium bicarbonate solution in the precipitation tank is lower than a set threshold value, the backflow control valves are opened, and the ammonium bicarbonate solution in the precipitation tank is conveyed to the reaction tank in a backflow mode through a pump. The reaction formula in the reaction tank is as follows: 2NH₃+CO₂+H₂O＝(NH₄)₂CO₃In which NH₃The access amount is sufficient; the reaction formula in the precipitation tank is as follows: NH (NH)₃+CO₂+H₂O＝NH₄HCO₃Generation of supersaturated NH₄HCO₃To make NH₄HCO₃Crystallizing and precipitating from the precipitation discharge port.

Further, the first carbonic acid mechanism is used for preparing carbonic acid by a pressurized dissolved gas method and comprises a first carbonic acid dissolved gas tank and H arranged on the reaction tower₂O water inlet, the first dissolved carbonic acid gas tank comprises first CO₂The system comprises a gas inlet and a first carbonic acid liquid outlet, wherein carbonic acid is formed in a first carbonic acid gas dissolving tank, the first carbonic acid liquid outlet is connected to a spray pipe, a circulating port of a reaction tank is connected with a circulating pump, and the pressure in the first carbonic acid gas dissolving tank is 0.2-0.6 MPa; and a first circulation outlet at the bottom of the reaction tank is connected to a first circulation inlet of the first dissolved carbonic acid gas tank through a first dissolved gas pump.

Further, the first carbonic acid mechanism can also prepare carbonic acid by an aeration method, and comprises H arranged on the reaction tower₂O water inlet andfirst CO₂An air inlet is arranged at the bottom of the reaction tank and is connected with the first CO₂A first aeration pipe connected with the air inlet, wherein a circulating port of the reaction tank is connected to the spray pipe through a circulating pump, and CO at the first aeration pipe₂And said H₂H connected with O water inlet₂The O reacts to form carbonic acid.

Further, the second carbonic acid mechanism prepares carbonic acid by an aeration method and comprises second CO arranged on the precipitation tank₂An air inlet is arranged in the precipitation tank, and the second CO is arranged in the precipitation tank₂And the second aeration pipe is connected with the air inlet.

Further, the second carbonic acid mechanism can also prepare carbonic acid by a pressurized dissolved gas method, and comprises a second carbonic acid dissolved gas tank which is provided with third CO₂The second carbonic acid liquid outlet is connected to the carbonic acid liquid inlet of the precipitation tower; and a second circulation outlet of the precipitation pool is connected to a second circulation inlet of the second dissolved carbonic acid gas tank through a second dissolved gas pump.

Further, this technical scheme still includes a method that contains ammonia waste gas recovery and recycle device, adopts above-mentioned an containing ammonia waste gas recovery and recycle device, includes the following step:

s001, introducing ammonia-containing waste gas, and introducing the ammonia-containing waste gas into an ammonia waste gas interface of the reaction tower to enable ammonia gas in the waste gas to enter the tower of the reaction tower;

s002, spraying carbonic acid, and preparing ammonium carbonate in the reaction tank; spraying carbonic acid prepared by a first carbonic acid mechanism through a plurality of spray pipes arranged in the reaction tower, and reacting the carbonic acid with sufficient ammonia gas in a reaction tank of the reaction tower to form an ammonium carbonate solution;

s003, preparing ammonium bicarbonate in the precipitation tank; the solution in the reaction tank is connected with a liquid inlet of the precipitation tower through a liquid outlet, and carbonic acid is introduced into the precipitation tank of the precipitation tower through a second carbonic acid mechanism to prepare and form ammonium bicarbonate;

and step S004, supersaturation crystallization is carried out to separate out ammonium bicarbonate, ammonium bicarbonate crystals are formed by crystallization at the bottom of the conical tank bottom at the bottom of the separation tank and are separated out from the separation discharge port.

Further, the reaction formula in the reaction tank in step S002 is: 2NH₃+CO₂+H₂O＝(NH₄)₂CO₃In which NH₃The access amount is sufficient; the reaction formula in the precipitation tank in step S003 is: NH (NH)₃+CO₂+H₂O＝NH₄HCO₃The solubility of the ammonium carbonate is higher than that of the ammonium bicarbonate, and a supersaturated ammonium bicarbonate solution is arranged in the precipitation tank, so that ammonium bicarbonate crystals are crystallized and precipitated at the bottom of the conical tank; in the step S004, when the concentration of the ammonium bicarbonate solution in the precipitation tank is lower than the set threshold, the reflux control valve is opened, and the ammonium bicarbonate solution in the precipitation tank is transported into the reaction tank through the reflux outlet of the precipitation tower and the reflux inlet of the reaction tower by reflux.

Further, the first carbonic acid mechanism in the step S002 adopts a pressurized dissolved gas method to prepare carbonic acid, and specifically includes: step S0021, H in the first dissolved carbonic acid gas tank₂O water inlet connected to H₂O; step S0022, first CO in the first dissolved carbonic acid gas tank₂Air inlet connected with CO₂(ii) a Step S0023, the carbonic acid formed in the first carbonic acid gas dissolving tank is connected to a spray pipe in the reaction tower through a first carbonic acid liquid outlet and is sprayed into the reaction tank; the pressure in the first carbonic acid gas dissolving tank is 0.2-0.6 MPa; a first circulation outlet at the bottom of the reaction tank is connected to a first circulation inlet of the first dissolved carbonic acid gas tank through a first dissolved gas pump; the second carbonic acid means in said step S003 produces carbonic acid by aeration through said second CO₂Introducing CO into a second aeration pipe in the precipitation tank through an air inlet₂。

Further, the first carbonic acid mechanism in the step S002 may further adopt an aeration method to prepare carbonic acid, and specifically includes: step S0021, H in reaction column₂The water inlet of the O is connected with the H₂O; step S0022, connecting CO into a first aeration pipe at the bottom of the reaction tank₂(ii) a Step S0023, forming in the reaction tankA circulating port of the reaction tank is connected to the spray pipe through a circulating pump and is sprayed into the reaction tank; the second carbonic acid mechanism in the step S003 is configured to prepare carbonic acid by a pressurized dissolved gas method, and specifically includes: step S0031, sequentially passing through a second circulation outlet, a second dissolved air pump and a second circulation inlet, and conveying the solution in the precipitation tank to a second carbonic acid dissolved air tank; step S0032, third CO in the second dissolved carbonic acid gas tank₂Air inlet connected with CO₂(ii) a And step S0033, the solution back-mixed in the second carbonic acid gas dissolving tank is connected to a carbonic acid liquid inlet of the precipitation tower through a second carbonic acid liquid outlet, and the solution returns to the precipitation tank to prepare ammonium bicarbonate.

(III) advantageous effects

The device and the method for recycling the ammonia-containing waste gas have the following advantages:

1) the device is provided with the reaction tower and the precipitation tower, carbonic acid and sufficient ammonia-containing waste gas are sprayed in the reaction tower to form an ammonia carbonate solution, so that ammonia in the waste gas can be absorbed as much as possible, the waste gas treatment efficiency is high, the reaction tower is communicated with the precipitation tower, carbonic acid is introduced into a precipitation tank of the precipitation tower to form a supersaturated ammonia carbonate solution, the solubility of the ammonia carbonate is higher than that of the ammonia carbonate, the ammonia carbonate forms supersaturated crystals at the bottom of the precipitation tank, the recovered ammonia carbonate crystals can be applied to a denitration process of a power plant, the treatment after ammonia recovery is greatly facilitated, secondary solid waste cannot be formed, the recovery value is high, and the effective utilization of resource recovery is realized;

2) the bottom of the precipitation tank is provided with a conical tank bottom, so that precipitated ammonium bicarbonate crystals can be precipitated at the bottom of the conical tank bottom conveniently and can be discharged conveniently;

3) h is dissolved in air by pressurization or aeration₂O and CO₂Forming carbonic acid, spraying the carbonic acid into the reaction tower, and fully reacting the carbonic acid with ammonia gas in the waste gas;

4) and the ammonium bicarbonate is separated by utilizing the principle of different solubility, so that the step of evaporative crystallization is omitted, and the equipment investment is effectively reduced.

5) The obtained ammonium bicarbonate crystal can be used in actual application such as denitration and the like, and achieves real resource utilization.

6) The method can be applied to the post-treatment of the ammonia nitrogen wastewater air stripping process, avoids the problem that the secondary pollution is caused by the fact that the ammonium sulfate, the ammonium chloride and the like cannot be effectively utilized due to insufficient purity, reduces the treatment cost of the ammonia nitrogen wastewater, can effectively treat the high-concentration ammonia nitrogen wastewater post-treatment, realizes resource recovery, and forms a benign environment-friendly treatment way.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the ammonia nitrogen waste gas recycling device of the present invention;

FIG. 2 is a schematic structural view of a second embodiment of the ammonia nitrogen waste gas recycling device of the present invention;

FIG. 3 is a schematic block diagram of the flow of the method of the ammonia nitrogen waste gas recycling device of the invention;

FIG. 4 is a schematic block diagram of the flow of step two of the embodiment of the method for recycling ammonia nitrogen waste gas;

FIG. 5 is a schematic block diagram of the flow of the second step of the method of the ammonia nitrogen waste gas recycling device of the present invention;

FIG. 6 is a schematic block diagram of the flow of the second step and the third step of the method of the ammonia nitrogen waste gas recycling device of the invention;

FIG. 7 is a schematic structural view of a third embodiment of the ammonia nitrogen waste gas recycling device of the present invention;

FIG. 8 is a schematic structural view of a fourth embodiment of the ammonia nitrogen waste gas recycling device of the present invention;

wherein: 1 is a reaction tower, 2 is an ammonia waste gas interface, 3 is a reaction tank, 4 is a spray pipe, 5 is an precipitation tower, 6 is a precipitation tank, 7 is a conical tank bottom, 8 is a precipitation discharge port, 9 is a first carbonic acid gas dissolving tank, 10 is H₂O water inlet, 11 is first CO₂An air inlet, 12 is a first carbonic acid liquid outlet, 13 is a circulating pump, 14 is a first aeration pipe, 15 is a circulating port, 16 is a liquid outlet, 17 is a liquid inlet, 18 is a second CO₂An air inlet, 19 is a second aeration pipe, 20 is a reflux outlet, 21 is a reflux inlet, 22 is a first circulation outlet, 23 is a first dissolved air pump, 24 is a first circulation inlet, 25 is a second carbonAcid-soluble gas tank 26 is third CO₂The air inlet, 27 is a second carbonic acid liquid outlet, 28 is a carbonic acid liquid inlet, 29 is a second circulation outlet, 30 is a second air dissolving pump, and 31 is a second circulation inlet.

Detailed Description