CN205145943U - Coal fired boiler SNCR and SCR unite deNOx systems - Google Patents

Coal fired boiler SNCR and SCR unite deNOx systems Download PDF

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Publication number
CN205145943U
CN205145943U CN201520899465.5U CN201520899465U CN205145943U CN 205145943 U CN205145943 U CN 205145943U CN 201520899465 U CN201520899465 U CN 201520899465U CN 205145943 U CN205145943 U CN 205145943U
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China
Prior art keywords
spray gun
boiler
urea
urea liquid
scr
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CN201520899465.5U
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Chinese (zh)
Inventor
高宁
董陈
张向宇
张波
向小凤
陆续
徐宏杰
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China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
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China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
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Abstract

The utility model provides an it is with low costs, efficient, make things convenient for current system to carry out the coal fired boiler SNCR and SCR unite deNOx systems who reforms transform, it includes boiler SNCR reaction system and SCR reactor, boiler SNCR reaction system includes boiler, urea solution distribution module and metering modules to reach urea injection system and the urea supply system connected by urea solution distribution module and metering modules, urea injection system includes and is the porous long spray gun that the multilayer was laid at boiler furnace combustion area upper portion elevation for 25m is short spray gun and the boiler book flame angular position that the multilayer laid to the 40m within range, every layer short spray gun is laid on wall and the side wall before the boiler respectively in turn, every layer at least one long spray gun is vertical to be laid in stretching into the boiler to extend and run through its place cross section, the SCR reactor passes through the flue gas blender and connects in the boiler afterbody, SCR reactor is located the space settings multilayer honeycomb formula catalyst between economizer and the air heater.

Description

A kind of coal-burning boiler SNCR and SCR combined denitration system
Technical field
The utility model relates to denitration system of power plant, is specially a kind of coal-burning boiler SNCR and SCR combined denitration system.
Background technology
In China's energy resource structure, coal occupies main status.A big chunk of consumption of coal is used for power generation.The nitrogen oxide (NOx) that coal fired power generation produces is one of major pollutants causing atmosphere pollution.
Reduce coal fired power plant NOx emission to realize by the technology such as low NOx combustion, SNCR denitration (SNCR) and selective-catalytic-reduction denitrified (SCR).Low NOx combustion is according to the formation mechanism of NOx in boiler, and use low NOx combustion method, the technology such as low-NOx combustor and low NOx burner hearth are to reduce the generation of nitrogen oxide.Selective non-catalytic reduction containing amino reducing agent, will spray into the region that fire box temperature is 800-1100 DEG C, and reducing agent decomposes rapidly and discharges NH 3and react with the NOx in flue gas and generate harmless nitrogen and water.SNCR technology denitration efficiency is generally 30%-50%, makees reducing agent for ammoniacal liquor, and key reaction is:
4NH 3+4NO+0 2→4N2+6H2O
4NH 3+2NO+20 2→4N 2+6H 2O
8NH 3+6NO 2→7N 2+12H 2O
Selective catalytic reduction is using liquefied ammonia or ammoniacal liquor as reducing agent, sprays in the flue of SCR denitration reactor upstream after it being mixed with air, generates nitrogen and water discharges system under the effect of catalyst with the reaction of nitrogen oxides in flue gas.SCR denitration efficiency can reach more than 80%.
In July, 2011; national environmental protection portion has issued new " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011); strict restriction has further been done to thermal power plant's emission limits of nitrogen oxides, specify all newly-built fired power generating unit from 1 day January in 2012, all active service units all will perform new edition discharged nitrous oxides standard from 1 day July in 2014.According to new standard, most of coal-burning power plant needs to carry out denitration technology transformation.For coal-burning boiler, be used alone SNCR technology and be difficult to reach higher denitration efficiency; Be used alone the denitration efficiency that SCR technology can reach higher, but spent cost is higher, and engineering difficulty is larger.SNCR+SCR combined denitration technology denitration efficiency is high, and improvement cost is relatively low, and engineering difficulty is little, is a kind of promising gas denitrifying technology.
In existing SNCR+SCR combined denitration technology, as the implementation method of patent of invention 201010130558.3 coal-burning boiler SNCR and SCR combined denitration, use single spray gun (i.e. the short spray gun of wall-) that urea liquid is sprayed into burner hearth, the distance spraying into burner hearth due to single spray gun is limited, can not well make pyrogenous origin NH 3mix with the NOx in flue gas with HNCO, although be provided with steam disturbing flow device at flue reversal chamber place, this steam disturbing flow device also can only improve NH to a certain extent 3with the mixing uniformity of NOx in HNCO and flue gas.Due to the NH that prior art can not make urea pyrolysis produce 3mix with NOx in flue gas with HNCO, so reduce the denitration efficiency of SCR to a certain extent.If enter ammonia nitrogen mol ratio skewness on smoke inlet cross section of SCR reactor, be easy to cause a large amount of ammonia not carry out SCR reaction and enter air preheater.In air preheater, the ammonia in flue gas runs into SO 3nH can be generated 4hSO 4, NH 4hSO 4be attached on the cold junction heating surface of air preheater, adhere to the dust in flue gas further, accumulation makes air preheater block, and causes corrosion to it.
Utility model content
For problems of the prior art, the utility model provides a kind of rational in infrastructure, and cost is low, and efficiency is high, the coal-burning boiler SNCR facilitating existing system to carry out transforming and SCR combined denitration system.
The utility model is achieved through the following technical solutions:
A kind of coal-burning boiler SNCR and SCR combined denitration system, comprise boiler SNCR reaction system and SCR reactor; Described boiler SNCR reaction system comprises boiler, urea liquid distribution module and metering module, and the urea injection system be connected with metering module by urea liquid distribution module and urea supply system; It is the short spray gun laid in multilayer in 25m to 40m scope that urea injection system is included in top, boiler furnace combustion zone absolute altitude, and boiler furnace arch, furnace nose position is the long spray gun of porous that multilayer is laid; Every layer short spray gun is alternately laid respectively on boiler front wall and side wall; The long spray gun of every layer at least one vertically stretches in boiler to be laid, and extends through its cross section, place; Described SCR reactor is connected to boiler tail by flue gas blender; In SCR reactor, the spatial placement multi-layer honeycomb formula catalyst between economizer and air preheater.
Preferably, short spray gun arranges air cooling system, arranges water cooling system in the long spray gun of porous; Short spray gun and the long spray gun of porous with the link position of boiler is arranged the reciprocating transmission mechanism advancing for controlling corresponding spray gun and retract.
Preferably, in every layer of cellular catalyst, soot blower is set respectively.
Preferably, urea injection system also comprises cooling water source and compressed air source, and is connected to cooling-air pipeline and the atomizing air pipeline of compressed air source output terminal, is connected to the cooling water pipeline of cooling water source 1 output; Described urea liquid distribution module comprises parallel two-way distribution circuit; Described metering module comprises two-way metering pipeline, and is jointly connected to the blender of two-way metering pipeline output; Cooling-air pipeline connects the input of short spray gun; Cooling water pipeline connects the input of the long spray gun of porous; Atomizing air pipeline connects the input of short spray gun and the long spray gun of porous respectively after a road distribution circuit; The output of blender connects the input of short spray gun and the long spray gun of porous respectively after another road distribution circuit.
Further, urea supply system comprises the urea liquid preparation system and urea liquid dilution system that connect successively; Urea liquid preparation system comprises the urea granules storehouse connected successively, urea dissolving tank and urea liquid unloading pump; Urea liquid dilution system comprises demineralized water storage tank, dilution water pump, 50% mass concentration urea liquid storage tank and urea liquid circulating pump; The output of demineralized water storage tank connects the input of dilution water pump and urea dissolving tank respectively, and dilution water delivery side of pump connects a road metering pipeline; Urea liquid unloading delivery side of pump connects the input of 50% mass concentration urea liquid storage tank, the output of 50% mass concentration urea liquid storage tank connects the input of urea liquid circulating pump, and urea liquid circulation delivery side of pump connects the input of another road metering pipeline and 50% mass concentration urea liquid storage tank respectively.
Compared with prior art, the utility model has following useful technique effect:
Denitrating system described in the utility model, by the two class spray guns that arrange in boiler furnace chamber and flue gas blender, while meeting SNCR reaction requirement, increase the disturbance of flue gas stream, make reducing agent and NOx Homogeneous phase mixing in SNCR reacts and SCR reacts, improve the removal efficiency of nitrogen oxide, simultaneously as the reducing agent of the SCR chimney flue type reactor that boiler back end ductwork is arranged, make use of the ammonia of escape fully, without the need to setting up SCR injection of reducing agent injection device, avoiding reducing agent in existing technique, mix the uneven denitration efficiency caused with NOx low, the equipment blocking that the escaping of ammonia causes and etching problem, the efficient reduction achieving NOx removes, reducing agent consumption is reduced while raising denitration efficiency, thus reduce the operating cost of denitrating system.
Further, multiple removable nozzles that the gun barrel of the long spray gun of porous is arranged, conveniently adjust its spray regime, and the convenient maintenance to spray gun; Utilize in multihole lance and be provided with water quench system, avoid its high temperature ablation in boiler furnace; Realize advancing and retraction operation by the reciprocating transmission mechanism of configuration, the convenient spray gun do not put into operation exits burner hearth in time and avoids high-temperature heating, simplifies the cleaning of urea injection system simultaneously, maintenance and Renewal process.
Accompanying drawing explanation
Fig. 1 is the structural representation of the combined denitration system described in the utility model example.
In figure: 1 is cooling water source; 2 is cooling water pipeline; 3 compressed air sources; 4 is cooling-air pipeline; 5 is atomizing air pipeline; 6 is urea liquid distribution module; 71 is short spray gun; 72 is the long spray gun of porous; 8 is boiler; 9 is flue gas blender; 10 is SCR reactor; 11 is catalyst; 12 is blender; 13 is metering module; 14 is demineralized water storage tank; 15 is dilution water pump; 16 is 50% mass concentration urea liquid storage tank; 17 is urea liquid circulating pump; 18 is urea granules storehouse; 19 is urea dissolving tank; 20 is urea liquid unloading pump.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is described in further detail, described in be to explanation of the present utility model instead of restriction.
A kind of coal-burning boiler SNCR of the utility model and SCR combined denitration system, the long spray gun 72 of the porous arranged in furnace chamber when being reacted by boiler SNCR and flue gas blender 9, increase flue gas stream disturbance, the SCR chimney flue type reactor 10 simultaneously utilizing boiler back end ductwork to arrange, without the need to setting up SCR injection of reducing agent injection device, overcoming reducing agent in existing technique, mix the uneven denitration efficiency caused with NOx low, the equipment blocking that the escaping of ammonia causes and etching problem, realize SNCR and the overall higher denitration efficiency of SCR system.SCR reactor can utilize boiler back end ductwork transformation simultaneously, saves the floor space needed for SCR engineering, reduces construction investment.
SNCR and SCR reaction is carried out successively in systems in which, in boiler furnace, temperature window is that the position of 800-1100 DEG C adds the urea liquid that mass concentration is 5-20%, the mode that this solution sprays with liquid mist, sprays into burner hearth by spray gun, and in burner hearth, urea liquid thermal decomposition is reducing agent NH 3and HNCO, part NH 3in burner hearth, namely carry out SNCR reaction with the NOx in flue gas, generate harmless N 2and H 2o, unreacted NH 3, HNCO and NOx to boiler export flue, carries out heat exchange cooling with flue gas, and in the process, air-flow is evenly distributed further in flue gas blender 9.Flue gas enters chimney flue type reactor at 300-420 DEG C, and the above-mentioned flue gas mixed, when flowing through chimney flue type reactor, carries out SCR reaction in catalyst surface, and the NOx in flue gas is converted to N 2.In SCR reaction, used catalyst active specy is V 2o 5and WO 3.In described reducing agent urea solution and flue gas, the mol ratio of NOx is between 1:1 to 2:1.By on the basis of denitrating system, urea supply system and metering module is utilized to ensure the proportioning of urea concentration, by distribution module, the urea liquid entering boiler is reasonably distributed, the while of ensureing that reducing agent is equally distributed, the addition of reducing agent can be controlled accurately, react fully and carry out, reduce the amount of the escaping of ammonia simultaneously; For follow-up SCR provides reducing agent, slow down the equipment corrosion caused by the escaping of ammonia simultaneously.
In system, urea liquid is configured by urea injection system and urea supply system.Urea injection system comprises cooling water source 1 and compressed air source 3, and is connected to cooling-air pipeline 4 and the atomizing air pipeline 5 of compressed air source 3 output; Be connected to the cooling water pipeline 2 of cooling water source 1 output; Urea liquid distribution module 6 comprises parallel two-way distribution circuit; Metering module 13 comprises two-way metering pipeline, and is jointly connected to the blender 12 of two-way metering pipeline output; Cooling-air pipeline 4 connects the input of short spray gun 71; Cooling water pipeline 2 connects the input of the long spray gun 72 of porous; Atomizing air pipeline 5 connects the input of short spray gun 71 and the long spray gun 72 of porous respectively after a road distribution circuit; The output of blender 12 connects the input of short spray gun 71 and the long spray gun 72 of porous respectively after another road distribution circuit.
Urea supply system comprises the urea liquid preparation system and urea liquid dilution system that connect successively; Urea liquid preparation system comprises the urea granules storehouse 18 connected successively, urea dissolving tank 19 and urea liquid unloading pump 20; Urea liquid dilution system comprises demineralized water storage tank 14, dilution water pump 15,50% mass concentration urea liquid storage tank 16 and urea liquid circulating pump 17; The output of demineralized water storage tank 14 connects the input of dilution water pump 15 and urea dissolving tank 19 respectively, and the output of dilution water pump 15 connects a road metering pipeline; The output of urea liquid circulating pump 17 connects the input of 50% mass concentration urea liquid storage tank 16, the output of 50% mass concentration urea liquid storage tank 16 connects the input of urea liquid circulating pump 17, and the output of urea liquid circulating pump 17 connects the input of another road metering pipeline and 50% mass concentration urea liquid storage tank 16 respectively.
The spray gun spraying urea liquid is divided into short spray gun 71 and the long spray gun 72 of porous.Short spray gun 71 is fixing or with the short spray gun of wall-of telescoping mechanism, generally stretches into inboard wall of burner hearth face about 10 ~ 50mm.Short spray gun 71 is single injector structure, and arrangement of nozzles at spray gun foremost.This spray gun adopts high temperature impact resistance, thermal deformation resistant, wear-resisting, corrosion resistant structure, adopts compressed air as cooling system.The long spray gun 72 of porous, can stretch into burner hearth completely, covers burner hearth cross section, and this spray gun adopts high temperature impact resistance, thermal deformation resistant, wear-resisting, corrosion resistant structure.Lance tube is arranged multiple nozzle, nozzle is demountable structure.For preventing multihole lance 72 high temperature ablation in boiler furnace, multihole lance 72 is provided with water cooling system.The long spray gun 72 of porous configures and advances and retraction mechanism, and the convenient spray gun do not put into operation exits burner hearth in time and avoids high-temperature heating, simplifies the cleaning of urea injection system simultaneously, maintenance and Renewal process.
On top, boiler furnace combustion zone, absolute altitude is 25m to 40m scope, alternately preferably lays 2 layers to 3 layers short spray gun 71 in boiler front wall and side wall, preferably lays 6-30 for every layer and props up; Preferably lay the long spray gun 72 of layer 2-4 porous in boiler furnace arch, furnace nose position simultaneously, preferably lay 1 for every layer, the use of the long spray gun 72 of porous and the setting of flue gas blender 9, add flue gas stream disturbance, the reducing agent and the NOx concentration that make to enter SCR catalyst entrance section are uniformly distributed, improve use effect of catalyst in SCR reactor 10, reach the overall higher denitration efficiency of SNCR+SCR.
For realizing denitrating system optimum efficiency after above-mentioned transformation, need according to boiler different load operating mode, under various combined running state, respectively the spray ammonia number of plies of SNCR denitration device, each layer ammonia spraying amount and total ammonia spraying amount are adjusted, and carry out optimum organization experiment, the best finally finding out boiler denitrating system under different load operating mode comes into operation mode, reaches systematic economy and runs, the object of NOx qualified discharge.
The utility model utilizes overall vibrational power flow improvement and the use of the long spray gun of porous and flue gas blender, increase the distributing homogeneity of reducing agent in SNCR and SCR system, the reducing agent and the NOx molar concentration ratio that make to enter SCR catalyst entrance section are uniformly distributed, improve the utilization rate of reducing agent in use effect of SCR catalyst reactor and SNCR denitration system, both synergies are strengthened, alleviate the problem of " the escaping of ammonia " in denitrating system, reach the overall higher denitration efficiency of SNCR+SCR.

Claims (5)

1. coal-burning boiler SNCR and a SCR combined denitration system, is characterized in that, comprises boiler SNCR reaction system and SCR reactor;
Described boiler SNCR reaction system comprises boiler (8), urea liquid distribution module (6) and metering module (13), and the urea injection system be connected with metering module (13) by urea liquid distribution module (6) and urea supply system; It is the short spray gun (71) laid in multilayer in 25m to 40m scope that urea injection system is included in boiler (8) top, furnace combustion zone absolute altitude, and boiler furnace arch, furnace nose position is the long spray gun of porous (72) that multilayer is laid; Every layer short spray gun (71) is alternately laid respectively on boiler front wall and side wall; The long spray gun (72) of every layer at least one vertically stretches in boiler (8) to be laid, and extends through its cross section, place;
Described SCR reactor (10) is connected to boiler (8) afterbody by flue gas blender (9); In SCR reactor (10), spatial placement multi-layer honeycomb formula catalyst (11) between economizer and air preheater.
2. a kind of coal-burning boiler SNCR according to claim 1 and SCR combined denitration system, is characterized in that, described short spray gun (71) arranges air cooling system, arranges water cooling system in the long spray gun of porous (72); Short spray gun (71) and the long spray gun of porous (72) arrange with on the link position of boiler (8) reciprocating transmission mechanism advancing for controlling corresponding spray gun and retract.
3. a kind of coal-burning boiler SNCR according to claim 1 and SCR combined denitration system, is characterized in that, arrange soot blower respectively in every layer of cellular catalyst.
4. a kind of coal-burning boiler SNCR according to claim 1 and SCR combined denitration system, it is characterized in that, described urea injection system also comprises cooling water source (1) and compressed air source (3), and be connected to cooling-air pipeline (4) and the atomizing air pipeline (5) of compressed air source (3) output, be connected to the cooling water pipeline (2) of cooling water source 1 output;
Described urea liquid distribution module (6) comprises parallel two-way distribution circuit;
Described metering module (13) comprises two-way metering pipeline, and is jointly connected to the blender (12) of two-way metering pipeline output;
Cooling-air pipeline (4) connects the input of short spray gun (71);
Cooling water pipeline (2) connects the input of the long spray gun of porous (72);
Atomizing air pipeline (5) connects the input of short spray gun (71) and the long spray gun of porous (72) respectively after a road distribution circuit;
The output of blender (12) connects the input of short spray gun (71) and the long spray gun of porous (72) respectively after another road distribution circuit.
5. a kind of coal-burning boiler SNCR according to claim 4 and SCR combined denitration system, is characterized in that, described urea supply system comprises the urea liquid preparation system and urea liquid dilution system that connect successively; Urea liquid preparation system comprises the urea granules storehouse (18) connected successively, urea dissolving tank (19) and urea liquid unloading pump (20); Urea liquid dilution system comprises demineralized water storage tank (14), dilution water pump (15), 50% mass concentration urea liquid storage tank (16) and urea liquid circulating pump (17);
The output of demineralized water storage tank (14) connects the input of dilution water pump (15) and urea dissolving tank (19) respectively, and the output of dilution water pump (15) connects a road metering pipeline; The output of urea liquid unloading pump (20) connects the input of 50% mass concentration urea liquid storage tank (16), the output of 50% mass concentration urea liquid storage tank (16) connects the input of urea liquid circulating pump (17), and the output of urea liquid circulating pump (17) connects the input of another road metering pipeline and 50% mass concentration urea liquid storage tank (16) respectively.
CN201520899465.5U 2015-11-11 2015-11-11 Coal fired boiler SNCR and SCR unite deNOx systems Expired - Fee Related CN205145943U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110975582A (en) * 2020-03-03 2020-04-10 山东中航天业科技有限公司 Flue gas desulfurization, denitrification and dust removal system of biomass circulating fluidized bed boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110975582A (en) * 2020-03-03 2020-04-10 山东中航天业科技有限公司 Flue gas desulfurization, denitrification and dust removal system of biomass circulating fluidized bed boiler

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Granted publication date: 20160413

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