CN211098427U - Medium-temperature type denitration system for flue gas of gas internal combustion engine - Google Patents
Medium-temperature type denitration system for flue gas of gas internal combustion engine Download PDFInfo
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- CN211098427U CN211098427U CN201920075207.3U CN201920075207U CN211098427U CN 211098427 U CN211098427 U CN 211098427U CN 201920075207 U CN201920075207 U CN 201920075207U CN 211098427 U CN211098427 U CN 211098427U
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Abstract
The utility model discloses a be used for medium temperature type deNOx systems of gas internal-combustion engine flue gas, including gas internal-combustion engine exhaust port, exhaust-heat boiler, SCR reactor, catalyst, chimney, ammonia generater, urea solution jar, compressed air jar, urea solution pipe, compressed air pipe, spray gun, governing valve, fan, bypass flue, flue and lithium bromide equipment. An ammonia generator is arranged and comprises an ammonia generator inner wall, a first effect-lifting ring, a first flow disturbing cone, a second effect-lifting ring, a third effect-lifting ring and a second flow disturbing cone. The medium temperature catalyst that this system can adopt, the product is more abundant in the medium temperature catalyst market, and the market price is lower, just so can reduce the construction cost and the long-term operating cost of gas internal-combustion engine flue gas denitration engineering, the utility model discloses still relate to an ammonia generater and prepare the ammonia to through the ammonia conversion rate to improving the urea to the optimal design of ammonia generater structure.
Description
Technical Field
The utility model relates to a be used for medium temperature type deNOx systems of gas internal-combustion engine flue gas belongs to gas internal-combustion engine flue gas denitration field.
Background
With the development of social economy, especially industrial economy, the air pollution is more and more serious. A major component of atmospheric pollutants is nitrogen oxides, which not only stimulate the respiratory system of humans, damage animals and plants, destroy the ozone layer, but also are one of the main substances causing greenhouse effect, acid rain and photochemical reactions. The gas internal combustion engine can realize the cascade utilization of energy sources in a combined supply mode of cold energy, heat energy and electricity energy due to the characteristics of flexibility, high efficiency, low emission and the like, and is widely applied to energy-intensive facilities such as municipal administration, industrial parks, commercial properties, buildings, hospitals, schools and the like. The special application places also provide higher requirements for the standard emission of the nitrogen oxides in the flue gas of the gas internal combustion engine.
The current technical scheme for reducing the emission of nitrogen oxides mainly comprises the following steps: (1) the low-nitrogen combustion technology is mainly suitable for large coal-fired boilers and the like, namely the generation of nitrogen oxides is controlled in the combustion process; the low-nitrogen oxide combustion technology can only reduce the nitrogen oxide emission value by 30-50%; (2) a Selective Catalytic Reduction (SCR) technology, which is mainly used for large coal-fired boilers and is a mainstream application technology in the flue gas denitration technology in China at present; (3) selective Non-Catalytic Reduction (SNCR) technology, mainly used for medium and small boilers such as waste incineration plants, is technically mature, but its efficiency is lower than that of SCR method; (4) the selective catalytic reduction technology (SCR) + the selective non-catalytic reduction technology (SNCR) is mainly used for the conditions of low nitrogen oxide emission and site limitation of large coal-fired boilers and is also more suitable for old boiler modification projects.
In the treatment technology of nitrogen oxides in the flue gas of a gas internal combustion engine, the selective catalytic reduction process technology (SCR denitration technology) is the mainstream treatment technology at present, and the principle is to utilize a reducing agent (such as NH)3And CO, etc.) on the surface of the catalyst, converting the nitrogen oxide into harmless nitrogen through the catalytic action, and achieving the purpose of reducing the emission of the nitrogen oxide. The adopted catalyst can be a high-temperature catalyst or a medium-temperature catalyst, the high-temperature catalyst is generally applicable at 330-550 ℃, can resist 600 ℃ for a short time, and the medium-temperature catalyst is generally applicable at 320-450 ℃. The temperature of the flue gas at the flue gas outlet of the internal combustion engine is basically the same as that at the inlet of the SCR reactor, generally 430-550 ℃, and the highest temperature can reach 600 ℃, a high-temperature catalyst is required to be adopted under the condition of the flue gas, the applicable temperature of the catalyst is 330-550 ℃, the catalyst can resist 600 ℃ for a short time, but the high-temperature catalyst has fewer products in the market and higher market price which is about 20 times that of the medium-temperature catalyst。
If the temperature of the flue gas discharged from the inlet of the SCR reactor can be reduced by 100 ℃, the medium-temperature catalyst can be adopted, the product in the medium-temperature catalyst market is full, the market price is low, and therefore the construction cost and the long-term operation cost of the flue gas denitration project of the gas internal combustion engine can be reduced.
In the existing technical scheme related to the denitration of the flue gas of a gas internal combustion engine, a patent number CN108744970A discloses a combined denitration system of a gas boiler and a methane internal combustion engine, and although the technology relates to the problem of combined denitration of the gas boiler and the methane internal combustion engine, the technology does not mention the utilization of the waste heat of the flue gas of the gas boiler and the internal combustion engine, adopts a high-temperature catalyst and does not relate to the generation problem of reducing agent ammonia gas; patent No. CN106762064A discloses a distributed energy denitration and silencing integrated device for a gas internal combustion engine, which relates to the utilization of waste heat of the gas internal combustion engine, but the technology does not relate to the problem of generating ammonia gas as a reducing agent. Neither of the above two technical solutions relates to the generation of ammonia gas as a reducing agent for denitration of a gas internal combustion engine.
CN108744970A and CN106762064A are used for the denitration of gas internal-combustion engine respectively, and what adopted in CN108744970A is that high temperature catalyst construction and operation cost are higher, and do not set up exhaust-heat boiler, lithium bromide equipment and heat exchanger, and its energy efficiency is low, can not realize simultaneously cooling and heat supply to and can not realize energy-conservation. CN106762064A adopts a distributed structure, and the function of the distributed structure is relatively single, and meanwhile, no ammonia generation related equipment is involved.
For the problem of solving gas internal-combustion engine flue gas denitration and the formation problem of required reductant ammonia in the gas internal-combustion engine flue gas denitration system, the utility model provides a medium temperature type deNOx systems for gas internal-combustion engine flue gas, the medium temperature catalyst that this system can adopt, the product is more abundant on the medium temperature catalyst market, and the market price is lower, just so can reduce the construction cost and the long-term operating cost of gas internal-combustion engine flue gas denitration engineering, the utility model discloses still relate to an ammonia generater and prepare the ammonia to through the ammonia conversion rate that improves the urea to the optimal design of ammonia generater structure.
Disclosure of Invention
The utility model discloses a main aim at solves the formation problem of required reductant ammonia among gas internal-combustion engine flue gas denitration problem and the gas internal-combustion engine flue gas denitration system.
In order to achieve the purpose, the utility model discloses a technical scheme be a be used for medium temperature type deNOx systems of gas internal-combustion engine flue gas, including gas internal-combustion engine exhaust port (1), exhaust-heat boiler (2), SCR reactor (3), catalyst (4), chimney (5), ammonia generater (6), urea solution jar (7), compressed air jar (8), urea solution pipe (9), compressed air pipe (10), spray gun (11), governing valve (12), fan (13), bypass flue (14), flue (15) and lithium bromide equipment (16).
The smoke outlet (1) of the gas internal combustion engine is connected with the waste heat boiler (2) through a flue (15); the waste heat boiler (2) is connected with the SCR reactor (3) through a flue (15); the catalyst (4) is arranged in the SCR reactor (3); the SCR reactor (3) is connected with a lithium bromide device (16) through a flue (15); the lithium bromide equipment (16) is connected with the chimney (5) through a flue (15).
One end of a bypass flue (14) is arranged on a flue (15) between a smoke outlet (1) of the gas internal combustion engine and the waste heat boiler (2), and the other end of the bypass flue (14) is arranged on the flue (15) in front of the SCR reactor (3).
The smoke outlet (1) of the gas internal combustion engine is connected with a fan (13) through a flue (15) and a bypass flue (14); the fan (13) is connected with the ammonia generator (6) through a bypass flue (14) and a regulating valve (12); the ammonia generator (6) is connected with the SCR reactor (3) through a bypass flue (14) and a flue (15); the urea solution tank (7) is connected with a spray gun (11) through a urea solution pipe (9); the compressed air tank (8) is connected with the spray gun (11) through a compressed air pipe (10); the spray gun (11) is inserted into the ammonia gas generator (6) along the vertical axial direction.
Further, an ammonia gas generator (6) is arranged and comprises an ammonia gas generator inner wall (6-1), a first effect-improving ring (6-2), a first flow-disturbing cone (6-3), a second effect-improving ring (6-4), a third effect-improving ring (6-5) and a second flow-disturbing cone (6-6); the inner wall (6-1) of the ammonia generator is cylindrical; the section of the first effect lifting ring (6-2) is an inclined sector surface and is connected with the inner wall (6-1) of the ammonia generator through a supporting structure; the sections of the second effect-lifting ring (6-4) and the third effect-lifting ring (6-5) are in the shape of oblique sectors and are respectively fixed on the inner wall (6-1) of the ammonia gas generator, and the first flow disturbing cone (6-3) and the second flow disturbing cone (6-6) are both conical inclined planes and are connected with the inner wall (6-1) of the ammonia gas generator through a supporting structure; the first effect-lifting ring (6-2), the first flow-disturbing cone (6-3), the second effect-lifting ring (6-4), the third effect-lifting ring (6-5) and the second flow-disturbing cone (6-6) are sequentially arranged along the axial direction of the ammonia gas generator (6).
The amount of flue gas in the bypass flue (14) is adjusted through a fan (13) and an adjusting valve (12), so that the temperature of the flue gas at an inlet of the SCR reactor (3) is 320-450 ℃; the flue gas temperature at the outlet of the SCR reactor (3) and the inlet of the lithium bromide equipment (16) is basically 320-450 ℃, the temperature of the flue gas after passing through the heat exchanger (17) is 50-120 ℃, and the flue gas is exhausted through a chimney (5).
The catalyst (4) is a medium temperature catalyst, and the medium temperature range is 320-450 ℃.
The fan (13) is a high-temperature variable-frequency fan.
Compared with the prior art, the utility model discloses following beneficial effect has.
The utility model provides a medium temperature type deNOx systems for gas internal-combustion engine flue gas, the medium temperature catalyst that this system can adopt, the product is more abundant in the medium temperature catalyst market, and the market price is lower, just so can reduce the construction cost and the long-term operating cost of gas internal-combustion engine flue gas denitration engineering, the utility model discloses still relate to an ammonia generater and prepare the ammonia to through the ammonia conversion rate that improves urea to the optimal design of ammonia generater structure.
Drawings
FIG. 1 is a schematic structural diagram of a medium temperature denitration system for flue gas of a gas internal combustion engine.
In the figure: 1. the device comprises a gas boiler smoke exhaust port, 2 a waste heat boiler, 3 an SCR reactor, 4a catalyst, 5 a chimney, 6 an ammonia gas generator, 7 a urea solution tank, 8 a compressed air tank, 9 a urea solution pipe, 10 a compressed air pipe, 11 a spray gun, 12 an adjusting valve, 13 a fan, 14 a bypass flue, 15 a flue, 16 and lithium bromide equipment.
FIG. 2 is a schematic view of an ammonia gas generator.
In the figure: 6-1 parts of the inner wall of the ammonia gas generator, 6-2 parts of a first effect-improving ring, 6-3 parts of a first flow-disturbing cone, 6-4 parts of a second effect-improving ring, 6-5 parts of a third effect-improving ring, 6-6 parts of a second flow-disturbing cone.
Fig. 3 is a schematic structural diagram of a medium temperature denitration system 2 for flue gas of a gas internal combustion engine.
In the figure: 17. a heat exchanger.
Detailed Description
Detailed description of the invention
The following description will be made by taking a flue gas denitration system of a 4.4MW gas internal combustion engine unit in a certain distributed energy station as an example in combination with the drawings.
In the SCR flue gas denitration system of a 4.4MW gas internal combustion engine unit of a certain distributed energy station, as shown in figures 1 and 2, the flue gas temperature at the smoke outlet (1) of the gas internal combustion engine is 430-550 ℃, the highest temperature can reach 600 ℃, the power generation output is 4.4MW, and the flue gas amount is dry 19888Nm when the load rate of the gas internal combustion engine is 100 percent3H, 5% O on a dry basis in the standard state2NO under the conditionsxAre all 500mg/Nm3(ii) a The temperature of a flue gas outlet of the lithium bromide equipment (16) is 145 ℃; the suitable temperature range of the catalyst (4) is 320-450 ℃.
The temperature of the flue gas after passing through the waste heat boiler (2) is 400 ℃, the temperature of the flue gas at the inlet of the SCR reactor (3) is basically 400 ℃, the temperature is within the applicable temperature range of 320-450 ℃ of the medium-temperature catalyst, and the flue gas amount in the bypass flue (14) is adjusted through the high-temperature variable-frequency fan (13) and the adjusting valve (12), so that the temperature of the flue gas at the inlet of the SCR reactor (3) is within 450 ℃; the temperature of the flue gas at the outlet of the SCR reactor (3) is basically within 450 ℃, the temperature of the flue gas is reduced to 145 ℃ after the flue gas passes through a lithium bromide device (16), and then the flue gas is exhausted through a chimney (5).
The urea solution with the concentration of 30-50% in the urea solution tank (7) enters a spray gun (11) through a urea solution pipe (9), compressed air with the pressure of 0.3-0.8 kg in a compressed air tank (8) enters the spray gun (11) through a compressed air pipe (10), the spray gun (11) is vertically and axially inserted into an ammonia gas generator (6), the urea solution is atomized in the ammonia gas generator (6) under the action of the compressed air and a spray nozzle of the spray gun (11), as shown in figure 2, the atomized urea micro-droplets and the flue gas are fully mixed under the action of three effect-lifting rings, the mixed flue gas speed is accelerated to rush to two turbulence cones, the mixed flue gas can form backflow under the action of the two turbulence cones, the time of the urea micro-droplets for generating the ammonia gas in the ammonia gas generator (6) is prolonged, the atomized urea micro-droplets are decomposed to generate the ammonia gas at the flue gas temperature of 400 ℃ in the ammonia gas generator (6), the ammonia conversion rate of the urea is improved by the structure optimization design of the ammonia generator (6) as shown in figure 2.
The generated ammonia gas enters an SCR reactor (3) along with the flue gas, nitrogen oxide in the flue gas and the generated ammonia gas perform catalytic reaction on the surface of a catalyst (4) to generate nitrogen gas, and NO is at the outlet of the SCR reactor (3)xIn the standard state, 5% O on a dry basis2At a conditional concentration of 30mg/Nm3。
Detailed description of the invention
The following description will be made by taking a flue gas denitration system of a 4.4MW gas internal combustion engine unit in a certain distributed energy station as an example in combination with the drawings.
In the SCR flue gas denitration system of a 4.4MW gas internal combustion engine unit of a certain distributed energy station, as shown in figures 2 and 3, the flue gas temperature at the smoke outlet (1) of the gas internal combustion engine is 430-550 ℃, the highest temperature can reach 600 ℃, the power generation output is 4.4MW, and the flue gas amount is dry 19888Nm when the load rate of the gas internal combustion engine is 100 percent3H, 5% O on a dry basis in the standard state2NO under the conditionsxAre all 500mg/Nm3(ii) a The temperature of a flue gas outlet of the lithium bromide equipment (16) is 145 ℃; the suitable temperature range of the catalyst (4) is 320-450 ℃; a heat exchanger (17) is additionally arranged between the lithium bromide equipment (16) and the chimney (5).
The temperature of the flue gas after passing through the waste heat boiler (2) is 400 ℃, the temperature of the flue gas at the inlet of the SCR reactor (3) is basically 400 ℃, the temperature is within the applicable temperature range of 320-450 ℃ of the medium-temperature catalyst, and the flue gas amount in the bypass flue (14) is adjusted through the high-temperature variable-frequency fan (13) and the adjusting valve (12), so that the temperature of the flue gas at the inlet of the SCR reactor (3) is within 450 ℃; the temperature of flue gas at the outlet of the SCR reactor (3) and the lithium bromide device (16) is basically within 450 ℃, the temperature of the flue gas is reduced to 145 ℃ after passing through the lithium bromide device (16), and the temperature of the flue gas is reduced to 72 ℃ from 145 ℃ after passing through the flue gas heat exchanger (17) and then the flue gas is exhausted through a chimney (5).
The energy efficiency of the medium-temperature denitration system for the flue gas of the gas internal combustion engine is higher after the heat exchanger (17) is additionally arranged between the SCR reactor (3) and the chimney (5).
The urea solution with the concentration of 30-50% in the urea solution tank (7) enters a spray gun (11) through a urea solution pipe (9), compressed air with the pressure of 0.3-0.8 kg in a compressed air tank (8) enters the spray gun (11) through a compressed air pipe (10), the spray gun (11) is vertically and axially inserted into an ammonia gas generator (6), the urea solution is atomized in the ammonia gas generator (6) under the action of the compressed air and a spray nozzle of the spray gun (11), as shown in figure 2, the atomized urea micro-droplets and the flue gas are fully mixed under the action of three effect-lifting rings, the mixed flue gas speed is accelerated to rush to two turbulence cones, the mixed flue gas can form backflow under the action of the two turbulence cones, the time of the urea micro-droplets for generating the ammonia gas in the ammonia gas generator (6) is prolonged, the atomized urea micro-droplets are decomposed to generate the ammonia gas at the flue gas temperature of 400 ℃ in the ammonia gas generator (6), the ammonia conversion rate of the urea is improved by the structure optimization design of the ammonia generator (6) as shown in figure 2.
The generated ammonia gas enters an SCR reactor (3) along with the flue gas, nitrogen oxide in the flue gas and the generated ammonia gas perform catalytic reaction on the surface of a catalyst (4) to generate nitrogen gas, and NO is at the outlet of the SCR reactor (3)xIn the standard state, 5% O on a dry basis2The conditioned concentration was 30mg/Nm 3.
The utility model provides a medium temperature type deNOx systems for gas internal-combustion engine flue gas, the medium temperature catalyst that this system can adopt, the product is more abundant in the medium temperature catalyst market, and the market price is lower, just so can reduce the construction cost and the long-term operating cost of gas internal-combustion engine flue gas denitration engineering, the utility model discloses still relate to an ammonia generater and prepare the ammonia to through the ammonia conversion rate that improves urea to the optimal design of ammonia generater structure.
Claims (1)
1. The utility model provides a be used for medium temperature type deNOx systems of gas internal-combustion engine flue gas which characterized in that: the device comprises a smoke outlet (1) of a gas internal combustion engine, a waste heat boiler (2), an SCR reactor (3), a catalyst (4), a chimney (5), an ammonia gas generator (6), a urea solution tank (7), a compressed air tank (8), a urea solution pipe (9), a compressed air pipe (10), a spray gun (11), an adjusting valve (12), a fan (13), a bypass flue (14), a flue (15) and a lithium bromide device (16);
the smoke outlet (1) of the gas internal combustion engine is connected with the waste heat boiler (2) through a flue (15); the waste heat boiler (2) is connected with the SCR reactor (3) through a flue (15); the catalyst (4) is arranged in the SCR reactor (3); the SCR reactor (3) is connected with a lithium bromide device (16) through a flue (15); the lithium bromide equipment (16) is connected with the chimney (5) through a flue (15);
one end of a bypass flue (14) is arranged on a flue (15) between a smoke outlet (1) of the gas internal combustion engine and the waste heat boiler (2), and the other end of the bypass flue (14) is arranged on the flue (15) in front of the SCR reactor (3);
the smoke outlet (1) of the gas internal combustion engine is connected with a fan (13) through a flue (15) and a bypass flue (14); the fan (13) is connected with the ammonia generator (6) through a bypass flue (14) and a regulating valve (12); the ammonia generator (6) is connected with the SCR reactor (3) through a bypass flue (14) and a flue (15); the urea solution tank (7) is connected with a spray gun (11) through a urea solution pipe (9); the compressed air tank (8) is connected with the spray gun (11) through a compressed air pipe (10); the spray gun (11) is inserted into the ammonia generator (6) along the vertical axial direction;
arranging an ammonia generator (6) which comprises an ammonia generator inner wall (6-1), a first effect-lifting ring (6-2), a first flow-disturbing cone (6-3), a second effect-lifting ring (6-4), a third effect-lifting ring (6-5) and a second flow-disturbing cone (6-6); the inner wall (6-1) of the ammonia generator is cylindrical; the section of the first effect lifting ring (6-2) is an inclined sector surface and is connected with the inner wall (6-1) of the ammonia generator through a supporting structure; the sections of the second effect-lifting ring (6-4) and the third effect-lifting ring (6-5) are in the shape of oblique sectors and are respectively fixed on the inner wall (6-1) of the ammonia gas generator, and the first flow disturbing cone (6-3) and the second flow disturbing cone (6-6) are both conical inclined planes and are connected with the inner wall (6-1) of the ammonia gas generator through a supporting structure; the first effect-lifting ring (6-2), the first flow-disturbing cone (6-3), the second effect-lifting ring (6-4), the third effect-lifting ring (6-5) and the second flow-disturbing cone (6-6) are sequentially arranged along the axial direction of the ammonia gas generator (6);
the amount of flue gas in the bypass flue (14) is adjusted through a fan (13) and an adjusting valve (12), so that the temperature of the flue gas at an inlet of the SCR reactor (3) is 320-450 ℃; the flue gas temperature at the outlet of the SCR reactor (3) and the inlet of the lithium bromide equipment (16) is 320-450 ℃, the temperature of the flue gas after passing through a heat exchanger (17) is 50-120 ℃, and the flue gas is exhausted through a chimney (5);
the catalyst (4) is a medium-temperature catalyst at 320-450 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569296A (en) * | 2019-01-16 | 2019-04-05 | 北京工大环能科技有限公司 | One kind is for warm type denitrating system in gas internal-combustion engine flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569296A (en) * | 2019-01-16 | 2019-04-05 | 北京工大环能科技有限公司 | One kind is for warm type denitrating system in gas internal-combustion engine flue gas |
| CN109569296B (en) * | 2019-01-16 | 2024-04-30 | 北京工大环能科技有限公司 | Medium-temperature denitration system for flue gas of gas internal combustion engine |
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