CN211936311U - Gas power generation boiler waste gas desulfurization and denitrification system - Google Patents
Gas power generation boiler waste gas desulfurization and denitrification system Download PDFInfo
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- CN211936311U CN211936311U CN202020518234.6U CN202020518234U CN211936311U CN 211936311 U CN211936311 U CN 211936311U CN 202020518234 U CN202020518234 U CN 202020518234U CN 211936311 U CN211936311 U CN 211936311U
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Abstract
The utility model discloses a gas power generation boiler waste gas desulfurization deNOx systems, including pure dry desulfurization tower, dust removal denitration integration reactor and booster fan. The pure dry desulfurization tower is connected with a dust removal and denitration integrated reactor through a pipeline, and the dust removal and denitration integrated reactor is connected with a booster fan. The dust removal and denitration integrated reactor comprises a cloth bag, a blowing system, an ash bucket, a first flue gas homogenizing module, an auxiliary heating system, an ammonia spraying grid, a second flue gas homogenizing module and a denitration catalyst. The dust removal and denitration integrated reactor is internally provided with a cloth bag, a first flue gas homogenizing module, an auxiliary heating system, an ammonia spraying grid, a second flue gas homogenizing module and a denitration catalyst from bottom to top in sequence. Can realize high-efficiency removal of SO in flue gas2The dust and low-temperature SCR denitration system has the advantages of no secondary pollution in the system operation process, convenience in maintenance, low energy consumption, small occupied area and easiness in operation.
Description
Technical Field
The utility model relates to a flue gas desulfurization and denitration equipment technical field especially relates to a gas power generation boiler flue gas desulfurization and denitration system.
Background
With the continuous deepening of the industrial industrialization process in China, a large amount of harmful smoke and harmful gases such as sulfur dioxide and various nitrogen-containing compounds are discharged in the industries such as coal-fired and gas-fired industries, and acid rain, photochemical smog and the like are formed in local areas. SO in recent years2、NOxThe proportion of the organic fertilizer in environmental pollutants is getting larger and larger. For long-term sustainable development, national emission standards for pollutants are becoming more and more stringent.
In recent years, with frequent occurrence of haze in China, more attention is paid to pollutant emission conditions in key industries such as thermal power generation and the like. Since 2016, Chinese coal-fired power plants gradually started to implement ultra-low emission reconstruction, and main pollutants (smoke dust and SO) of the coal-fired power plants are obtained after the reconstruction2And NOx) Can meet the national emission limit requirement of gas turbine units, and part of power plants can not generatexThe discharge concentration has reached 25mg/m3The level of (c). It is well known that combustion occurs due to differences in fuel propertiesGas power generation is cleaner and more efficient than coal-fired power generation, but with ultra-low emission modification of coal-fired power plants, the environmental protection advantages of gas power plants are challenged. In particular, in recent years, the installed capacity of gas and electricity is rapidly expanded, and in addition, the gas power plant is mainly located in an economically developed and environmentally sensitive area, so the environmental protection problem is increasingly highlighted. Therefore, the desulfurization and denitrification equipment is required to remove the pollutants as much as possible to reach the emission standard.
The existing flue gas filtering system is difficult to simultaneously meet the requirements of efficient desulfurization, dust removal and denitration, and can cause secondary pollution. Meanwhile, other independent desulfurization, dust removal and denitration in the current market are simply integrated together, so that the defects of high energy consumption, large occupied area and complex equipment operation are overcome. Through detection, Chinese patent 201420179488.6, the name is: the utility model provides a power boiler SOx/NOx control processing system, this application include desulfurizing tower, spray set, flue gas cooling device, oxidation fan and boiler cyclone, and spray set sets up in the desulfurizing tower, flue gas cooling device connects power boiler's play dirt mouth, and boiler cyclone connects the flue gas cooling device other end, and will the oxidation fan is connected the desulfurizing tower. However, the application adopts ammonia spraying water for denitration, and the aim of effectively reducing nitrogen oxides by ammonia water to achieve high denitration rate cannot be achieved at the temperature of 45-55 ℃. In addition, the adopted wet desulphurization technology can generate waste water to cause secondary pollution. Cannot meet the increasingly strict environmental protection requirements.
In addition, the temperature of the exhaust gas at the outlet of the economizer is low, so that the energy consumption is increased in order to avoid reheating in the denitration process. Therefore, the pollutants in the flue gas can be efficiently removed by searching the desulfurization and denitrification equipment which has low energy consumption, small occupied area and easy operation and can perform low-temperature denitrification. The method not only meets the market demand, but also contributes to the environmental protection industry.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas power generation boiler exhaust gas desulfurization deNOx systems can realize SO in the high-efficient desorption flue gas2Dust and low-temperature SCR denitration, no secondary pollution in the system operation process, convenient maintenance, low energy consumption and occupied areaSmall, easy to operate, has solved the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model discloses a gas power generation boiler waste gas SOx/NOx control system, for the purpose that realizes SOx/NOx control dust removal, including pure dry desulfurization tower, dust removal and denitration integration reactor, booster fan, gas power generation boiler waste gas SO2The content is not high, dry desulfurization is adopted, and because the outlet temperature of an economizer is lower in the production process of the gas power generation boiler, the energy consumption is increased for avoiding reheating the flue gas, the NO in the flue gas is catalytically removed by adopting a low-temperature SCR denitration catalystx. However, SO in the exhaust gas is taken into account2And alkali metals, alkaline earth metals and heavy metals in the flue gas dust have larger blocking and poisoning effects on the low-temperature SCR denitration catalyst, so that the desulfurization tower and the bag-type dust remover are arranged at the upstream of the denitration reactor. In addition, in order to reduce the floor area of the equipment, a dust removal and denitration integrated device is adopted. The pure dry desulfurization tower is connected with a dust removal and denitration integrated reactor through a pipeline, and the top end of the dust removal and denitration integrated reactor is connected with a booster fan through a pipeline;
the pure dry desulfurization tower comprises a desulfurization tower main body, a grinding system and a desulfurizer spray gun, wherein the desulfurizer spray gun is arranged on the side wall of the denitrification tower main body and is connected with the grinding system;
the dust removal and denitration integrated reactor comprises a cloth bag, a blowing system, an ash bucket, a first flue gas homogenizing module, an ammonia spraying grid, a second flue gas homogenizing module and a denitration catalyst, wherein the cloth bag, the first flue gas homogenizing module, an auxiliary heating system, the ammonia spraying grid, the second flue gas homogenizing module and the denitration catalyst are sequentially arranged in the dust removal and denitration integrated reactor from bottom to top, the blowing system is arranged at the upper end of the cloth bag, and the ash bucket is arranged at the lower end of the dust removal and denitration integrated reactor.
Preferably, a dust collector air inlet is arranged on the side wall between the ash bucket and the cloth bag, and the pure dry desulfurization tower is connected with the inner cavity of the dust removal and denitration integrated reactor through the dust collector air inlet.
Preferably, the first flue gas homogenizing module and the second flue gas homogenizing module are both multilayer pore plates, through holes are formed in the pore plates, and the through holes in the adjacent pore plates are staggered.
Preferably, the denitration catalyst is a low-temperature SCR denitration catalyst.
Preferably, the auxiliary heating system is used for controlling the temperature of the exhaust gas so that the catalyst is in an optimal temperature activity window.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses a gas power generation boiler waste gas SOx/NOx control system adopts the dry desulfurization, has practiced thrift the cost, and can realize desulfurization dust removal denitration simultaneously. Adopts the low-temperature SCR denitration catalyst, solves the problem that the prior economizer has low outlet flue gas temperature and is difficult to remove NO efficientlyxThe problem of (2) also avoids resource waste caused by waste gas reheating denitration. The waste gas passes through the pure dry desulfurization tower 1 and the dedusting section in sequence and then passes through the denitration section, SO that the dust and SO in the waste gas can be effectively reduced2The alkali metal, the alkaline earth metal and the heavy metal block and poison the denitration catalyst, and the service life of the denitration catalyst 12 is prolonged. The dust removal and denitration integrated reactor is adopted, the occupied area is small, the equipment is simplified, the operation is easy, the investment is low, and no secondary pollution is caused.
Drawings
FIG. 1 is an overall structure diagram of the present invention;
FIG. 2 is a structural diagram of a pure dry desulfurization tower of the present invention;
FIG. 3 is a structural diagram of the dust-removing and denitration integrated reactor of the utility model;
fig. 4 is a first structure diagram and a second structure diagram of the flue gas homogenizing module.
In the figure: 1. a pure dry desulfurization tower; 2. a dedusting and denitration integrated reactor; 3. a booster fan; 4. a grinding system; 5. a desulfurizer spray gun; 6. a cloth bag; 7. a blowing system; 8. an ash hopper; 9. a first flue gas homogenizing module; 10. an ammonia injection grid; 11. a second flue gas homogenizing module; 12. a denitration catalyst; 13. a main body of the desulfurizing tower; 14. an air inlet of a dust remover; 15. an auxiliary heating system; 16. an orifice plate; 17. and a through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a flue gas desulfurization and denitrification system for a gas-fired power generation boiler includes a pure dry desulfurization tower 1, a dust removal and denitrification integrated reactor 2, and a booster fan 3. The upper reaches of pure dry desulfurization tower 1 are connected with the economizer, the economizer is connected with gas power boiler through the draught fan, the waste gas that gas power boiler produced is drawn forth from main economizer export through the draught fan, then get into pure dry desulfurization tower 1 and desulfurize, pure dry desulfurization tower 1 is connected with dust removal denitration integration reactor 2 through the pipeline, the top of dust removal denitration integration reactor 2 is connected with booster fan 3 through the pipeline, provide power by booster fan 3, make the flue gas flow in this system, later clean flue gas gets into air heater, send into chimney exhaust flue gas at last.
Referring to fig. 2, the pure dry desulfurization tower 1 includes a desulfurization tower main body 13, a grinding system 4, and a desulfurizing agent spray gun 5. The desulfurizer spray gun 5 is installed on the side wall of the desulfurizing tower main body 13 and is connected with the grinding system 4, and the waste gas reacts with sulfur dioxide in the pure dry desulfurizing tower 1 to realize desulfurization. The waste gas generated by the gas power generation boiler is led out from the outlet of the main economizer through the induced draft fan, firstly enters the desulfurizing tower, the desulfurizing agent is firstly ground into a certain number by the grinding system 4, and then is sprayed into the desulfurizing tower through the desulfurizing agent spray gun 5 to be mixed with the waste gas to achieve the aim of desulfurization. The pure dry desulfurization tower 1 is connected with the inner cavity of the dedusting and denitration integrated reactor 2 through the air inlet 14 of the deduster.
Referring to fig. 3, the dust-removing and denitration integrated reactor 2 includes a cloth bag 6, an injection system 7, an ash bucket 8, a first flue gas homogenizing module 9, an ammonia-injection grid 10, and a second flue gas homogenizing module11. A denitration catalyst 12 and an auxiliary heating system 15. The cloth bag 6, the first flue gas homogenizing module 9, the auxiliary heating system 15, the ammonia spraying grid 10, the second flue gas homogenizing module 11 and the denitration catalyst 12 are sequentially arranged in the dust removal and denitration integrated reactor 2 from bottom to top. The cloth bag 6, the blowing system 7 and the ash bucket 8 are positioned at the lower end of the desulfurizing tower main body 13 to form a dust removing section, and the desulfurized waste gas enters the dust removing section. Wherein, the upper end of sack 6 is installed jetting system 7, and the ash bucket 8 is installed to the lower extreme of dust removal denitration integration reactor 2, is equipped with dust remover air inlet 14 on the lateral wall between ash bucket 8 and sack 6. The dust is intercepted on the surface of the filter bag through the filtering and purifying effect of the cloth bag 6, so that the dust removal effect is achieved. The dust accumulated on the cloth bag 6 falls into a dust hopper 8 of the dust collector under the regular blowing of the blowing system 7 and enters the dust storage bin through the dust conveying system to wait for outward transportation. The first flue gas homogenizing module 9, the auxiliary heating system 15, the ammonia injection grid 10, the second flue gas homogenizing module 11 and the denitration catalyst 12 are located at the upper end of the desulfurizing tower main body 13 to form a denitration section. The first flue gas homogenizing module 9 and the second flue gas homogenizing module 11 are both multilayer pore plates 16, through holes 17 are formed in the pore plates 16, and the through holes 17 in the adjacent pore plates 16 are staggered with each other, so that flue gas is uniformly mixed. The auxiliary heating system 15 is used to control the temperature of the exhaust gas so that the catalyst is in an optimum temperature activity window. The ammonia gas sprayed through the ammonia spraying grid 10 has better dispersibility. The denitration catalyst 12 is a low-temperature SCR denitration catalyst 12, and NO is catalyzed by the denitration catalyst 12xIs reduced by ammonia gas at low temperature to achieve the aim of denitration.
The system work flow is as follows:
and the waste gas generated by the gas power generation boiler is led out from the outlet of the economizer through the induced draft fan. Firstly, the desulfurizing agent enters a desulfurizing tower, is ground into a certain mesh number by a grinding system 4, and then is sprayed into the desulfurizing tower through a desulfurizing agent spray gun 5 to be mixed with waste gas so as to achieve the aim of desulfurizing. Secondly, the desulfurized waste gas enters the dust removal and denitration integrated reactor 2 from the dust remover air inlet 14, and the dust is intercepted on the surface of the filter bag through the filtering and purifying effect of the cloth bag 6, so that the dust removal effect is achieved. The dust accumulated on the cloth bag 6 falls into a dust hopper 8 of the dust collector under the regular blowing of the blowing system 7 and enters the dust storage bin through the dust conveying system to wait for outward transportation.Then the flue gas after desulfurization and dust removal enters a denitration section, the flue gas passes through a first flue gas homogenizing module 9 to enable the flow velocity and the flow direction of the waste gas to be uniform, then the waste gas is uniformly mixed with the ammonia gas sprayed in through an ammonia spraying grid 10 and the hot air sprayed in through an auxiliary heating system 15 under the homogenizing action of a second flue gas homogenizing module 11, and NO is catalyzed when the gas reaches the surface of a catalystxAnd NH3And O2Reacting into harmless gas, and removing NO in waste gasxAnd the standard of emission is achieved.
Finally, the dust and SO in the waste gas are removed efficiently2And NOxThe clean flue gas is conveyed to an air preheater through a booster fan 3, and is sent to a chimney for emission after heat exchange.
In summary, the following steps: the utility model discloses a gas power generation boiler waste gas desulfurization deNOx systems adopts the dry process desulfurization, has practiced thrift the cost. The adoption of the low-temperature SCR denitration catalyst 12 solves the problem that the temperature of the flue gas at the outlet of the traditional economizer is low, and the NO is difficult to be removed efficientlyxThe problem of (2) also avoids resource waste caused by waste gas reheating denitration. The waste gas passes through the pure dry desulfurization tower 1 and the dedusting section in sequence and then passes through the denitration section, SO that the dust and SO in the waste gas can be effectively reduced2The alkali metal, the alkaline earth metal, and the heavy metal block and poison the denitration catalyst 12, and the service life of the denitration catalyst 12 is prolonged. The dust removal and denitration integrated reactor 2 is adopted, the occupied area is small, the equipment is simplified, the operation is easy, the investment is low, and no secondary pollution is caused.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a gas power generation boiler exhaust gas desulfurization deNOx systems, includes pure dry desulfurization tower (1), dust removal denitration integration reactor (2) and booster fan (3), its characterized in that: the dust removal and denitration integrated reactor is characterized in that the pure dry desulfurization tower (1) is connected with a dust removal and denitration integrated reactor (2) through a pipeline, the top end of the dust removal and denitration integrated reactor (2) is connected with a booster fan (3) through a pipeline, the pure dry desulfurization tower (1) comprises a desulfurization tower main body (13), a grinding system (4) and a desulfurizer spray gun (5), the desulfurizer spray gun (5) is installed on the side wall of the desulfurization tower main body (13) and is connected with the grinding system (4), the dust removal and denitration integrated reactor (2) comprises a cloth bag (6), an injection system (7), an ash bucket (8), a first flue gas homogenizing module (9), an ammonia injection grid (10), a second flue gas homogenizing module (11), a denitration catalyst (12) and an auxiliary heating system (15), and the cloth bag (6), the denitration catalyst (12) and the auxiliary heating system (15) are sequentially installed in, The device comprises a first flue gas homogenizing module (9), an auxiliary heating system (15), an ammonia spraying grid (10), a second flue gas homogenizing module (11) and a denitration catalyst (12), wherein a spraying system (7) is installed at the upper end of a cloth bag (6), and an ash bucket (8) is installed at the lower end of a dedusting and denitration integrated reactor (2).
2. The gas-fired power generation boiler flue gas desulfurization and denitrification system according to claim 1, characterized in that: and a dust collector air inlet (14) is formed in the side wall between the ash bucket (8) and the cloth bag (6), and the pure dry desulfurization tower (1) is connected with an inner cavity of the dust removal and denitration integrated reactor (2) through the dust collector air inlet (14).
3. The gas-fired power generation boiler flue gas desulfurization and denitrification system according to claim 1, characterized in that: the first flue gas homogenizing module (9) and the second flue gas homogenizing module (11) are both multilayer pore plates (16), through holes (17) are formed in the pore plates (16), and the through holes (17) in the adjacent pore plates (16) are staggered with each other.
4. The gas-fired power generation boiler flue gas desulfurization and denitrification system according to claim 1, characterized in that: the denitration catalyst (12) is a low-temperature SCR denitration catalyst.
5. The gas-fired power generation boiler flue gas desulfurization and denitrification system according to claim 1, characterized in that: the auxiliary heating system (15) is used for controlling the temperature of the exhaust gas so that the catalyst is in an optimal temperature activity window.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115155302A (en) * | 2022-06-20 | 2022-10-11 | 成都易态科技有限公司 | Treatment system and treatment method for furnace gas of fuming furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115155302A (en) * | 2022-06-20 | 2022-10-11 | 成都易态科技有限公司 | Treatment system and treatment method for furnace gas of fuming furnace |
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