CN111214928A - Factory waste gas treatment system containing ammonia gas - Google Patents
Factory waste gas treatment system containing ammonia gas Download PDFInfo
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- CN111214928A CN111214928A CN201811417139.0A CN201811417139A CN111214928A CN 111214928 A CN111214928 A CN 111214928A CN 201811417139 A CN201811417139 A CN 201811417139A CN 111214928 A CN111214928 A CN 111214928A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
Abstract
The invention relates to a factory waste gas treatment system containing ammonia, wherein a main gas inlet pipe connected with a factory waste gas pipeline is connected with a first ammonia absorption tower and a second ammonia absorption tower which are internally provided with ammonia purifiers, the first ammonia absorption tower and the second ammonia absorption tower are connected with a catalytic combustion tower, a main gas outlet pipe of the catalytic combustion tower is connected with a heat exchanger, the main gas outlet pipe is connected with two gas return pipes and a loop gas outlet pipe, the gas return pipes and the loop gas outlet pipes are respectively connected with two ends of a vent pipe in the two ammonia absorption towers, the ammonia absorption towers are provided with ventilation valves, ammonia is adsorbed and stored by acidic adsorbent components in the purifiers through the ammonia absorption towers after ammonia waste gas is supplemented with air, the purified gas is catalytically combusted through the catalytic combustion towers, the generated heat is recycled through the heat exchanger, the ammonia purifiers and the adsorbents can be regenerated, the two ammonia absorption towers are alternately used to form an uninterrupted treatment system containing ammonia combustible waste gas, therefore, a large amount of factory waste gas can be treated, the process is simple, and the cost is low.
Description
Technical Field
The invention relates to the technical field of factory waste gas treatment.
Background
Industrial waste gases emitted by various production enterprises are important sources of atmospheric pollutants. If a large amount of industrial waste gas is discharged into the atmosphere after reaching the standard without treatment, the quality of the atmospheric environment is inevitably reduced, serious harm is brought to the human health, and huge loss is caused to national economy. After toxic and harmful substances in industrial waste gas can enter a human body through respiratory tract and skin, the long-term low-concentration or short-term high-concentration contact can cause temporary and permanent pathological changes of systems and organs such as breath, blood, liver and the like of the human body.
At present, a lot of industrial waste gas is generated in the production process of many enterprises, and the industrial waste gas is usually accompanied by pungent smell, wherein ammonia gas is included. Ammonia gas is a colorless gas and has an irritating malodorous smell. The aqueous solution was alkaline and the pH of the aqueous solution was 11.1. Tearing, stomachache, hoarseness, cough, phlegm with blood, chest distress, dyspnea and the like can occur after a large amount of ammonia gas is absorbed in a short period, and dizziness, headache, nausea, vomiting, hypodynamia and the like can be accompanied, so that severe patients can have pulmonary edema and adult respiratory distress syndrome, and respiratory tract irritation symptoms can occur at the same time. If too much ammonia is inhaled, the hydrogen concentration in blood is too high, and the heart can stop beating and breathing can stop through the reflex action of trigeminal nerve endings, thereby being dangerous to life. When exposed to ammonia gas for a long time, part of people may have symptoms such as skin pigmentation or finger pain. The existing ammonia gas treatment device usually adopts a recovery or combustion mode, but generally, the recovery of ammonia gas requires complex equipment, high cost, poor recovery rate, low treatment efficiency, uncontrollable concentration of NOx generated by combustion and easy secondary pollution.
Currently, the treatment methods of ammonia gas are probably as follows:
(1) by water in the absorption tower to NH3The ammonia water is absorbed to form ammonia water, for example, the ammonia gas treatment device disclosed in the Chinese patent with the publication number of 108283865A, the method has low ammonia gas absorption rate, the ammonia water can also cause harm to human bodies and pollution to the environment, and the method is only suitable for absorption positions of a small amount of ammonia gasIt is not suitable for treatment of a large amount of exhaust gas discharged from a plant.
(2) The physical adsorption method is adopted, for example, in the Chinese patent with the publication number of 207254055U, namely ammonia gas treatment equipment, gas is filtered by an activated carbon adsorption net, the method has low ammonia gas absorption rate and can not fully absorb ammonia gas, and the method is only suitable for the absorption treatment of a small amount of ammonia gas and is not suitable for the treatment of a large amount of waste gas discharged by a factory.
(3) The chemical reaction method is adopted, for example, an ammonia gas treatment device which is a Chinese patent with the publication number of 205435421U, and the process is complex in a mode of mutually combining a sulfuric acid washing tower, a uranium hypochlorite oxidation tower and a spraying washing tower.
(4) By NH3A reduction method, such as Chinese patent publication No. 205868007U, a large capacity ammonia gas treatment device, converts ammonia gas into nitrogen oxides by using on-site combustion, and then uses NH3The NOx gas is reduced to form N2, no secondary pollution is caused, but the method causes NH due to the difficulty in controlling the using amount of NH33Escape and cause contamination.
Disclosure of Invention
In order to solve the problems of the existing ammonia gas treatment method, the invention provides a factory waste gas treatment system containing ammonia gas.
The technical scheme adopted by the invention for realizing the purpose is as follows: a factory waste gas treatment system containing ammonia gas, a main gas inlet pipe 500 connected with a factory waste gas pipeline is connected with a first ammonia gas absorption tower 100 provided with an ammonia gas purifying agent 101 inside, the first ammonia gas absorption tower 100 is connected with a catalytic combustion tower 300 provided with a catalytic combustion catalyst 301 inside through a first gas outlet pipe 502, the main gas outlet pipe 601 of the catalytic combustion tower 300 is connected with a heat exchanger 400, the main gas outlet pipe 601 is connected with a first gas return pipe 603 and a first loop gas outlet pipe 602, the first gas return pipe 603 and the first loop gas outlet pipe 602 are respectively connected with two ends of a first gas vent pipe 102 in the first ammonia gas absorption tower 100, and the first ammonia gas absorption tower 100 is provided with a gas exchange valve 705; ammonia-containing waste gas enters a first ammonia absorption tower 100 through a main gas inlet pipe 500, ammonia is adsorbed and stored by an ammonia purifying agent 101, the purified gas enters a catalytic combustion tower through a first gas outlet pipe 502 to contact with a catalytic combustion catalyst 301 for catalytic combustion, the generated high-temperature gas enters a heat exchanger 400 through a main gas outlet pipe 601 of the catalytic combustion tower for heat recovery and utilization, after the first absorption tower 100 absorbs ammonia and is saturated, a first gas inlet pipe 501 and a first gas outlet pipe 502 are closed, a first gas return pipe 603 and a first loop gas outlet pipe 602 are communicated, part of the high-temperature gas after catalytic combustion flows through a first vent pipe 102 to heat the first ammonia absorption tower, so that the ammonia adsorbed in the purifying agent is desorbed and is subjected to oxidation reduction reaction with oxide components in the purifying agent to convert into harmless nitrogen, meanwhile, regeneration of acidic adsorbent components in the purifying agent is completed, and then a vent valve 705 of the first ammonia absorption tower is, and (3) allowing air to enter the first ammonia absorption tower 100, oxidizing and regenerating oxide components in the purifying agent reduced by ammonia again, closing the first ammonia absorption tower scavenging valve 705 after the oxidizing and regenerating are finished, and closing the first air return pipe 603 and the first loop air outlet pipe 602 to finish the regeneration of the first ammonia absorption tower.
The total gas inlet pipe 500 is respectively connected with the first ammonia gas absorption tower 100 and the second ammonia gas absorption tower 200 through a first gas inlet pipe 501 and a second gas inlet pipe 503, a first gas outlet pipe 502 of the first ammonia gas absorption tower 100 and a second gas outlet pipe 504 of the second ammonia gas absorption tower 200 are connected with a gas inlet pipe 600 of the catalytic combustion tower 300, the total gas outlet pipe 601 of the catalytic combustion tower 300 is connected with a first gas return pipe 603, a first loop gas outlet pipe 602, a second gas return pipe 605 and a second loop gas outlet pipe 604, the first gas return pipe 603 and the first loop gas outlet pipe 602 are respectively connected with two ends of a first vent pipe 102 in the first ammonia gas absorption tower 100, and the second gas return pipe 605 and the second loop gas outlet pipe 604 are respectively connected with two ends of a second vent pipe 202 of the second ammonia gas absorption tower 200; a first air inlet pipe switch valve 701 is arranged on the first air inlet pipe 501, a first air outlet pipe switch valve 702 is arranged on the first air outlet pipe 502, a first air return pipe switch valve 801 is arranged on the first air return pipe 603, and a first circuit air outlet pipe switch valve 802 is arranged on the first circuit air outlet pipe 602; a second air inlet pipe switch valve 703 is arranged on the second air inlet pipe 503, a second air outlet pipe switch valve 704 is arranged on the second air outlet pipe 504, a second air return pipe switch valve 804 is arranged on the second air return pipe 605, a second loop air outlet pipe switch valve 803 is arranged on the second loop air outlet pipe 604, a scavenging valve 705 is arranged on the first ammonia absorption tower 100, and a scavenging valve 706 is arranged on the second ammonia absorption tower 200; ammonia-containing waste gas enters the first ammonia absorption tower 100 through the main gas inlet pipe 500 and the first gas inlet pipe 501, ammonia is adsorbed and stored by an ammonia purifying agent, purified gas enters the catalytic combustion tower through the main gas inlet pipe 600 of the first gas outlet pipe 502 connected with the catalytic combustion tower 300 and contacts with the catalytic combustion catalyst 301 for catalytic combustion, generated high-temperature gas enters the heat exchanger 400 through the main gas outlet pipe 601 of the catalytic combustion tower for heat recovery and utilization, after the ammonia is saturated in the first absorption tower 100, the communicating valves 701 and 702 of the ammonia-containing waste gas and the ammonia-containing waste gas are closed, and the first absorption tower is regenerated; meanwhile, the second ammonia absorption tower 200 is opened to be communicated with the valves 703 and 704, so that the combustible waste gas containing ammonia flows through the second ammonia absorption tower 200 and the catalytic combustion tower 300, the continuous ammonia absorption and combustible gas catalytic combustion are realized, and the ammonia absorption and regeneration are alternately performed by the second ammonia absorption tower 200 and the first ammonia absorption tower 100.
The first air return pipe 603 is connected with a first fan 901, the second air return pipe 605 is connected with a second fan 902, and the main air inlet pipe of the catalytic combustion tower is connected with a fan 903.
The ammonia purifying agent is a compound of an ammonia adsorbent and an ammonia oxidant, the ammonia adsorbent is one or more than two of aluminum oxide, silicon oxide, kaolin or activated carbon soaked by sulfuric acid or phosphoric acid, and the ammonia oxidant is one or more than two of copper oxide, zinc oxide, iron oxide, cobalt oxide and nickel oxide.
The catalytic combustion catalyst is a supported catalyst of noble metals platinum and/or palladium.
According to the factory waste gas treatment system containing ammonia gas, ammonia gas is adsorbed through the ammonia gas absorption tower provided with the acidic ammonia gas adsorbent and the ammonia gas oxidant, combustible gas in the waste gas is subjected to catalytic combustion through the catalytic combustion tower, generated high-temperature gas is subjected to heat recovery and utilization through the heat exchanger, a part of the high-temperature gas intermittently circulates to heat the ammonia gas absorption tower after the ammonia gas is saturated, so that the ammonia gas adsorbed in the purifying agent is desorbed and is subjected to oxidation reduction reaction with oxide components in the purifying agent to be converted into harmless nitrogen gas, regeneration of the acidic adsorbent components in the purifying agent is completed, the capacity of adsorbing the ammonia gas is recovered, and the whole system is a circulating system, so that a large amount of factory waste gas can be treated, and the system is simple in process and low.
Drawings
FIG. 1 is a schematic diagram of an ammonia-containing plant waste gas treatment system of the present invention.
In the figure: 100. a first ammonia absorption tower 101, ammonia adsorbent and oxidant 102, a first vent pipe 200, a second ammonia absorption tower 202, a second vent pipe 300, a catalytic combustion tower 301, a catalytic combustion catalyst 400, a heat exchanger 500, a total intake pipe 501, a first intake pipe 502, a first outlet pipe 503, a second intake pipe 504, a second outlet pipe 600, an intake pipe 601, a total outlet pipe 602, a first loop outlet pipe 603, a first return pipe 604, a second loop outlet pipe 605, a second return pipe 701, a first intake pipe switch valve 702, a first outlet pipe switch valve 703, a second intake pipe switch valve 704, a second outlet pipe switch valve 704, a first ammonia absorption tower switch valve 706, a second ammonia absorption tower switch valve 801, a first return pipe switch valve 802, a first outlet pipe switch valve 803, a second outlet pipe switch valve, 804. a second air return pipe switch valve 901, a first fan 902, a second fan 903 and a fan.
Detailed Description
The principle of the factory waste gas treatment system containing ammonia gas is shown in fig. 1, a total gas inlet pipe 500 connected with a factory waste gas pipeline is respectively connected with a first ammonia gas absorption tower 100 and a second ammonia gas absorption tower 200 through a first gas inlet pipe 501 and a second gas inlet pipe 503, a first gas outlet pipe 502 of the first ammonia gas absorption tower 100 and a second gas outlet pipe 504 of the second ammonia gas absorption tower 200 are connected with a gas inlet pipe 600 of a catalytic combustion tower 300, a total gas outlet pipe 601 of the catalytic combustion tower 300 is connected with a first gas return pipe 603, a first loop gas outlet pipe 602, a second gas return pipe 605 and a second loop gas outlet pipe 604, the first gas return pipe 603 and the first loop gas outlet pipe 602 are respectively connected with two ends of a first vent pipe 102 in the first ammonia gas absorption tower 100, and the second gas return pipe 605 and the second loop gas outlet pipe 604 are respectively connected with two ends of a second vent pipe 202 of the second ammonia gas absorption tower 200; a first air inlet pipe switch valve 701 is arranged on the first air inlet pipe 501, a first air outlet pipe switch valve 702 is arranged on the first air outlet pipe 502, a first air return pipe switch valve 801 is arranged on the first air return pipe 603, and a first circuit air outlet pipe switch valve 802 is arranged on the first circuit air outlet pipe 602; a second air inlet pipe switch valve 703 is arranged on the second air inlet pipe 503, a second air outlet pipe switch valve 704 is arranged on the second air outlet pipe 504, a second air return pipe switch valve 804 is arranged on the second air return pipe 605, a second loop air outlet pipe switch valve 803 is arranged on the second loop air outlet pipe 604, a scavenging valve 705 is arranged on the first ammonia absorption tower 100, a scavenging valve 706 is arranged on the second ammonia absorption tower 200, the first air return pipe 603 is connected with a first fan 901, the second air return pipe 605 is connected with a second fan 902, and the main air inlet pipe of the catalytic combustion tower is connected with the fan 903.
The ammonia gas purifying agent 101 is a compound of an ammonia gas adsorbent and an ammonia gas oxidizing agent, the ammonia gas adsorbent is one or more than two of aluminum oxide, silicon oxide, kaolin or activated carbon soaked by sulfuric acid or phosphoric acid, and the ammonia gas oxidizing agent is one or more than two of copper oxide, zinc oxide, iron oxide, cobalt oxide and nickel oxide, and the principle is described in the publication No. 108043451A-a copper-based supported ammonia oxidation catalyst and a preparation method thereof, and 105214723A-a copper-containing ammonia oxidation catalyst and a preparation method thereof, and the description is omitted herein for brevity. The catalytic combustion catalyst is a supported catalyst of noble metals platinum and/or palladium.
The working principle is as follows: factory waste gas (generally 20-30 ℃) containing ammonia gas and combustible gas (such as hydrogen and methane) enters the first ammonia gas absorption tower 100 through the total gas inlet pipe 500 and the first gas inlet pipe 501, the ammonia gas is absorbed on the acidic solid adsorbent A contained in the ammonia gas purifying agent 101 in the first ammonia gas absorption tower 100, and the process can be expressed as NH3+A→NH3A, so as to achieve the purpose of reducing the content of ammonia in the gas, the purified combustible waste gas is mixed with air supplemented by a fan 903 through a first air outlet pipe 502, then the mixture enters the catalytic combustion tower 300 through a main air inlet pipe 600 connected with the catalytic combustion tower 300, catalytic combustion is carried out on a catalyst 301 in the catalytic combustion tower 300 to release heat, and the reaction process can be expressed as 2H2+O2→2H2O or CH4+2O2→CO2+2H2And O, the generated high-temperature gas enters the heat exchanger 400 through the main gas outlet pipe 601 of the catalytic combustion tower to exchange heat and recycle heat. After the first ammonia absorption tower 300 absorbs ammonia to reach the saturation amount, the regeneration can be performed by the following operations: closing the first air inlet pipe switch valve 701 and the first air outlet pipe switch valve 702, connecting the first air return pipe switch valve 801 of the first air return pipe 602 and the first loop air outlet pipe switch valve 602 of the first loop air outlet pipe 603, enabling part of the high-temperature gas after catalytic combustion to flow through the first air pipe 102 to heat the first ammonia gas absorption tower, enabling ammonia gas adsorbed by the acidic adsorbent in the purifying agent 101 to be desorbed, wherein the reaction process is that
The released ammonia gas can be subjected to oxidation-reduction reaction with oxide components in the purifying agent under the condition of heating to generate harmless nitrogen gas, in the case of copper oxide, the reaction process can be expressed as
Then, a first scavenging valve 705 on the first ammonia absorption tower 100 is opened, so that the air enters the first ammonia absorption tower and reacts with the reduced copper to form copper oxide, wherein the reaction process is as follows
Thereby completing the regeneration of the oxide component in the purifying agent, closing the first scavenging valve 705 after the regeneration is completed, and closing the first return gas pipe 603 and the first return gas outlet pipe 602 to complete the regeneration of the first ammonia absorption tower.
This system can set up the structure of above-mentioned ammonia absorption tower and catalytic combustion tower all the way, also can set up two ammonia absorption towers and two return gas pipelines, when the ammonia purifying agent in the first ammonia absorption tower needs to realize the regeneration, close first intake pipe ooff valve 701 of first intake pipe 501 and the first outlet duct ooff valve 702 of first outlet duct 502 of first ammonia absorption tower, handle the ammonia through second ammonia absorption tower 200, when the ammonia in the second ammonia absorption tower needs to realize the regeneration, and in the same way, two ammonia absorption towers can work in turn, whole system can incessant absorption treatment waste gas.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A factory exhaust treatment system that contains ammonia characterized in that: the other end of a main gas inlet pipe (500) with one end connected with a factory waste gas pipeline is connected with a first ammonia absorption tower (100) internally provided with an ammonia purifying agent (101), the first ammonia absorption tower (100) is connected with a catalytic combustion tower (300) internally provided with a catalytic combustion catalyst (301) through a first gas outlet pipe (502), the main gas outlet pipe (601) of the catalytic combustion tower (300) is connected with a heat exchanger (400), the main gas outlet pipe (601) is connected with a first gas return pipe (603) and a first loop gas outlet pipe (602), the first gas return pipe (603) and the first loop gas outlet pipe (602) are respectively connected with two ends of a first gas vent pipe (102) in the first ammonia absorption tower (100), and the first ammonia absorption tower (100) is provided with a gas exchange valve (705);
ammonia-containing waste gas enters a first ammonia absorption tower (100) through a main gas inlet pipe (500), ammonia is adsorbed and stored by an ammonia purifying agent (101), purified gas enters a catalytic combustion tower through a first gas outlet pipe (502) and is in contact with a catalytic combustion catalyst (301) for catalytic combustion, generated high-temperature gas enters a heat exchanger (400) through a main gas outlet pipe (601) of the catalytic combustion tower for heat recovery and utilization, after the first absorption tower (100) absorbs ammonia and is saturated, a first gas inlet pipe (501) and the first gas outlet pipe (502) are closed, a first gas return pipe (603) and a first loop gas outlet pipe (602) are communicated, part of the high-temperature gas after catalytic combustion flows through a first gas vent pipe (102) to heat the first ammonia absorption tower, so that the ammonia adsorbed in the purifying agent is desorbed and is subjected to oxidation reduction reaction with oxide components in the purifying agent to be converted into harmless nitrogen, and meanwhile, regeneration of acidic adsorbent components in the purifying agent is, and then opening a first ammonia absorption tower scavenging valve (705), enabling air to enter the first ammonia absorption tower (100), oxidizing and regenerating oxide components in the purifying agent reduced by ammonia again, closing the first ammonia absorption tower scavenging valve (705) after the oxidizing and regenerating are finished, and closing a first air return pipe (603) and a first loop air outlet pipe (602) to finish the regeneration of the first ammonia absorption tower.
2. A factory exhaust treatment system that contains ammonia characterized in that: one end of a main air inlet pipe (500) is connected with a factory waste gas pipeline, the other end of the main air inlet pipe is respectively connected with a first ammonia absorption tower (100) and a second ammonia absorption tower (200) through a first air inlet pipe (501) and a second air inlet pipe (503), a first air outlet pipe (502) of the first ammonia absorption tower (100) and a second air outlet pipe (504) of the second ammonia absorption tower (200) are connected with an air inlet pipe (600) of the catalytic combustion tower (300), a main air outlet pipe (601) of the catalytic combustion tower (300) is connected with a first air return pipe (603), a first loop air outlet pipe (602), a second air return pipe (605) and a second loop air outlet pipe (604), the first air return pipe (603) and the first loop air outlet pipe (602) are respectively connected with two ends of a first vent pipe (102) in the first ammonia absorption tower (100), and the second air return pipe (605) and the second loop air outlet pipe (604) are respectively connected with two ends of a second vent pipe (202) of the second ammonia absorption tower (200); a first air inlet pipe switch valve (701) is arranged on the first air inlet pipe (501), a first air outlet pipe switch valve (702) is arranged on the first air outlet pipe (502), a first air return pipe switch valve (801) is arranged on the first air return pipe (603), and a first loop air outlet pipe switch valve (802) is arranged on the first loop air outlet pipe (602); a second air inlet pipe switch valve (703) is arranged on the second air inlet pipe (503), a second air outlet pipe switch valve (704) is arranged on the second air outlet pipe (504), a second air return pipe switch valve (804) is arranged on the second air return pipe (605), a second loop air outlet pipe switch valve (803) is arranged on the second loop air outlet pipe (604), a scavenging valve (705) is arranged on the first ammonia absorption tower (100), and a scavenging valve (706) is arranged on the second ammonia absorption tower (200); ammonia-containing waste gas enters a first ammonia absorption tower (100) through a main gas inlet pipe (500) and a first gas inlet pipe (501), ammonia is adsorbed and stored by an ammonia purifying agent, purified gas enters a catalytic combustion tower through a main gas inlet pipe (600) of which a first gas outlet pipe (502) is connected with a catalytic combustion tower (300) and is contacted with a catalytic combustion catalyst (301) for catalytic combustion, generated high-temperature gas enters a heat exchanger (400) through a main gas outlet pipe (601) of the catalytic combustion tower for heat recovery and utilization, after the first absorption tower (100) absorbs ammonia and is saturated, communicating valves (701) and (702) of the ammonia-containing waste gas are closed, and the first absorption tower is regenerated; meanwhile, communicating valves (703) and (704) of the second ammonia absorption tower (200) are opened, so that the combustible waste gas containing ammonia flows through the second ammonia absorption tower (200) and the catalytic combustion tower (300), continuous ammonia absorption and combustible gas catalytic combustion are realized, and the ammonia absorption and regeneration are alternately carried out by the second ammonia absorption tower (200) and the first ammonia absorption tower (100).
3. A plant waste gas treatment system containing ammonia gas according to claim 1 or 2, characterized in that: the first air return pipe (603) is connected with a first fan (901);
the second air return pipe (605) is connected with a second fan (902);
the main gas inlet pipe of the catalytic combustion tower is connected with a fan (903).
4. A plant waste gas treatment system containing ammonia gas according to claim 1 or 2, characterized in that: the ammonia purifying agent is a compound of an ammonia adsorbent and an ammonia oxidant, the ammonia adsorbent is one or more than two of aluminum oxide, silicon oxide, kaolin or activated carbon soaked by sulfuric acid or phosphoric acid, and the ammonia oxidant is one or more than two of copper oxide, zinc oxide, iron oxide, cobalt oxide and nickel oxide.
5. A plant waste gas treatment system containing ammonia gas according to claim 1 or 2, characterized in that: the catalytic combustion catalyst is a supported catalyst of noble metals platinum and/or palladium.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112274837A (en) * | 2020-11-11 | 2021-01-29 | 郭铁良 | Hand-throwing type water-based fire extinguishing liquid bomb capable of consuming ammonia gas in fire scene |
| CN113069917A (en) * | 2021-04-20 | 2021-07-06 | 南京科宜环保科技有限公司 | Denitration catalyst module box with ammonia adsorption function and preparation method thereof |
| CN113975929A (en) * | 2021-10-26 | 2022-01-28 | 中国科学院力学研究所 | Method for removing ammonia from tail gas in production process of high-tower compound fertilizer |
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