CN204395778U - A kind of ultra-clean exhaust system for fluidized-bed combustion boiler - Google Patents

A kind of ultra-clean exhaust system for fluidized-bed combustion boiler Download PDF

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CN204395778U
CN204395778U CN201420784348.XU CN201420784348U CN204395778U CN 204395778 U CN204395778 U CN 204395778U CN 201420784348 U CN201420784348 U CN 201420784348U CN 204395778 U CN204395778 U CN 204395778U
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China
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scr
gas
fluidized
desulphurization
bed combustion
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CN201420784348.XU
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Chinese (zh)
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王鹏利
高洪培
张世鑫
王海涛
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中国华能集团清洁能源技术研究院有限公司
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Abstract

A kind of ultra-clean exhaust system for fluidized-bed combustion boiler, comprise the desulfuration in furnace device being arranged in fluidized-bed combustion boiler emulsion zone and the SNCR device being arranged in furnace outlet, the outlet of SNCR device connects separator, the flue gas going out separator accesses hot precipitator successively after superheater and economizer, the exhanst gas outlet of hot precipitator is connected with SCR device, the exhanst gas outlet of SCR device is connected with air preheater, the exhanst gas outlet of air preheater is connected with the smoke inlet of cold precipitator, the exhanst gas outlet of cold precipitator is connected with the smoke inlet of desulphurization system, the flue gas going out desulphurization system drains into chimney and on pipeline, arranges the clean flue gas generator for promoting flue-gas temperature, the utility model adopts high, low temperature dust arrester carries out two-stage dedusting and in conjunction with SNCR+SCR mode combined denitration, to adopt in stove+stove external square type desulfurization simultaneously, there is denitration, desulfuration efficiency is high, reliability is high, adaptability for working condition is strong, the advantages such as discharge controllability is good.

Description

A kind of ultra-clean exhaust system for fluidized-bed combustion boiler

Technical field

The utility model belongs to boiler environmental technology field, particularly a kind of ultra-clean exhaust system for fluidized-bed combustion boiler.

Background technology

The popular fluidized bed boiler technology that circulates is the high-efficiency low-pollution clean burning branch art developed rapidly in recent ten years, has that fuel tolerance is wide, efficiency of combustion is high, high-efficiency desulfurization, nitrogen oxide (NO x) discharge the advantages such as low, combustion intensity is high, furnace cross-sectional area is little, load regulation range is large, Load Regulation is fast, be easy to realize ash comprehensive utilization, fuel pretreatment system is simple, coal supply point is few.Therefore this technology all obtains business application widely in fields such as station boiler, Industrial Boiler and offal treatment utilizations.

Operating experience shows, the NO of CFBB xdischarge value is substantially at 400mg/m 3below.CFBB NO xdischarge and be lowly due to following two reasons: one is low-temperature burning, and the nitrogen now in air generally can not generate NO x; Two is sectional combustions, suppresses the nitrogen in fuel to be converted into NO x, and make the NO that part has generated xreduced.

To SO in " thermal power plant's air pollution emission standard " (GB13223-2003) 2and NO xemission limit be respectively 400mg/m 3, 450mg/m 3.For CFBB, only need to carry out desulfuration in furnace and can make SO 2discharge, NO xemission compliance, therefore original Circulating Fluidized Bed Boilers does not arrange denitrification apparatus substantially.After " thermal power plant's air pollution emission standard " (GB13223-2011) implements, to SO 2and NO xemission limit all reduce to 100mg/m 3, cause existing equipment condition substantially cannot meet environmental requirement.

The denitration technology being applied to boiler at present is mainly divided into combustion control technology and gas denitrifying technology.Combustion control technology comprises: CFB boiler combustion technology, Researched of Air Staging Combustion Burning Pulverized Coal, fuel-staged combustion, flue gas recirculation, low NO technology, burning optimization; Gas denitrifying technology mainly comprises: SCR (SCR technology), SNCR (SNCR method), SNCR+SCR.Be applied to the mainly combustion control technology of CFBB at present.

The advantage of SCR is: denitration efficiency high (70 ~ 90%), technology maturation, and domestic application is many; Shortcoming is: cost of investment high (needing catalyst, cost to be more than 3 times of SNCR), operating cost higher (reducing agent, catalyst), mounting means to boiler structure change large, afterbody easily stains, burn into is applicable to newly-built coal dust unit.

The advantage of SNCR is: floor space little (being arranged on boiler body), cost of investment low (cost is 1/4 ~ 1/3 of SCR), operating cost lower (0.003 ~ 0.004 yuan/kWh), installation and operation are comparatively easy, technology maturation; Adaptation parameter, load, coal varitation are fast; Contribute to reducing average unit cost, not catalysis increases sulfur trioxide (SO 3), do not cause blocking or the corrosion of back-end surfaces, air preheater; Be specially adapted to CFB unit and old unit denitration transformation; Shortcoming is: denitration efficiency is not high enough, comparatively SCR is slightly high for amount of ammonia slip.

The feature of SNCR+SCR: denitration efficiency high (40 ~ 80%), cost of investment is lower slightly, operating cost is lower slightly (reducing agent, a small amount of catalyst), amount of ammonia slip is low, the reaction volume that significantly can reduce SCR.The ammonia of escaping can, with the SCR system in flue gas flow direction downstream, make its utilization rate reactivity more complete.Reducing agent can use urea to replace more dangerous liquefied ammonia.Shortcoming is: fluidized-bed combustion boiler application experience is less, also there is the problems such as the SCR catalyst life-span is short simultaneously.

Be applied to the desulfur technology mainly desulfuration in furnace of fluidized-bed combustion boiler at present, flue gas desulfurization is mainly used in coal-powder boiler.Fluidized-bed combustion boiler can by SO by adding desulfurizing agent (lime stone, carbide slag etc.) in stove 2discharge value controls to reduced levels, but under new environmental protection standard, and existing desulfuration in furnace device exists inadequate, less economical, the desulfurization of exerting oneself and is difficult to the problems such as up to standard.

Summary of the invention

In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of ultra-clean exhaust system for fluidized-bed combustion boiler, there is native system there is the advantages such as denitration efficiency is high, desulfuration efficiency is high, system reliability is high, adaptability for working condition is strong, NOx, SO2 discharge controllability is good, the cycle of operation is long, operating cost is low, existing fluidized-bed combustion boiler can be made to meet the requirement of " thermal power plant's air pollution emission standard " (GB13223-2011).

To achieve these goals, the technical solution adopted in the utility model is:

A kind of ultra-clean exhaust system for fluidized-bed combustion boiler, comprise the desulfuration in furnace device 17 being arranged in fluidized-bed combustion boiler emulsion zone and the SNCR device 15 being arranged in burner hearth 16 outlet, described SNCR device 15 exports and connects separator 14, the flue gas going out separator 14 accesses hot precipitator 11 successively after superheater 13 and economizer 12, the exhanst gas outlet of hot precipitator 11 is connected with SCR device 22, the exhanst gas outlet of SCR device 22 is connected with air preheater 7, the exhanst gas outlet of air preheater 7 is connected with the smoke inlet of cold precipitator 6, the exhanst gas outlet of cold precipitator 6 is connected with the smoke inlet of desulphurization system 1 and on connecting line, is provided with air-introduced machine 23 and booster fan 26, the connecting line of air-introduced machine 23 and booster fan 26 is provided with gas baffle 3 25, the flue gas going out desulphurization system 1 drains into chimney and on pipeline, arranges the clean flue gas generator 3 for promoting flue-gas temperature.

Described SCR device 22 has been arranged in parallel SCR bypass 10, SCR bypass 10 and the smoke inlet connecting line of SCR device 22 there is gas baffle 4 21, SCR bypass 10 and the exhanst gas outlet connecting line of SCR device 22 have gas baffle 59, and described SCR bypass 10, gas baffle 4 21 and gas baffle 59 move back switching for the throwing realizing SCR device 22; Described desulphurization system 1 has been arranged in parallel desulphurization system bypass 24, and desulphurization system 1 is arranged between gas baffle 3 25 and gas baffle 1, and described desulphurization system bypass 24, gas baffle 3 25 and gas baffle 1 move back switching for the throwing realizing desulphurization system 1.

Be connected with air compartment 18 bottom described burner hearth 16, pressure fan 8 air feed is by leading to air compartment 18 after air preheater 7 preheating.

Material returning device 19 tieback is passed through to fluidized-bed combustion boiler emulsion zone in the bottom of described separator 14.

Described SNCR device 15 is arranged in burner hearth 16 and exports 800 ~ 1050 DEG C of regions, and described desulfuration in furnace device 17 is arranged in the bottom of burner hearth 16.

Described hot precipitator 11 is arranged in economizer 12 flue-gas temperature 360 DEG C of regions afterwards, efficiency of dust collection design is not less than 90%, after described air preheater 7 is arranged in SCR device 22, for reducing flue-gas temperature and heat recovery, described cold precipitator 6 is normal exhaust gas temperature region after being arranged in air preheater 7.

Described desulphurization system 1 adopts the ammonia process of desulfurization or wet limestone-gypsum FGD.

Described clean flue gas generator 3 adopts natural gas or fuel oil as fuel, for promoting desulphurization system 1 exit gas temperature, to ensure the diffusivity of flue gas.

Gas baffle 22 is provided with between described clean flue gas generator 3 and the flue gas going out desulphurization system 1.

Compared with prior art, the beneficial effects of the utility model are:

1) native system adopts high and low temperature dust arrester to carry out two-stage dedusting, and efficiency of dust collection is higher.

2) SCR device described in native system is arranged in hot precipitator exit region, and flue dust is less, and catalyst operating environment is better, and life cycle is long; Meanwhile, SCR device work cigarette temperature is still higher, and catalyst comparative maturity, choice is large.

3) the clean flue gas generator that native system is arranged can promote desulphurization system exit gas temperature, to ensure that flue gas has higher diffusivity.

4) native system adopts SNCR+SCR: denitration efficiency high (40 ~ 80%), cost of investment is lower slightly, operating cost is lower slightly (reducing agent, a small amount of catalyst), amount of ammonia slip is low, the reaction volume that significantly can reduce SCR device.The ammonia of escaping can, with the SCR device in flue gas flow direction downstream, make its utilization rate reactivity more complete, and reducing agent can use urea to replace more dangerous liquefied ammonia; Thus, while making system run all right, economy strengthen, the escaping of ammonia reduces greatly.

5) native system adopts desulfuration in furnace in conjunction with external desulfurzation system two-step desulfurization, too increases SO equally 2the controllability of discharge, external desulfurzation is the recyclable byproduct (ammonium sulfate, gypsum etc.) with certain economic value also, reduces desulphurization system operating cost.

In sum, native system has that denitration efficiency is high, desulfuration efficiency is high, system reliability is high, adaptability for working condition is strong, NO x, SO 2the advantages such as discharge controllability is good, the cycle of operation is long, operating cost is low.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model for the ultra-clean exhaust system of fluidized-bed combustion boiler.

Detailed description of the invention

Embodiment of the present utility model is described in detail below in conjunction with drawings and Examples.

In the utility model, for the ultra-clean discharge method of fluidized-bed combustion boiler, realize mainly through following process procedure:

Once desulfurization in stove is carried out at fluidized-bed combustion boiler emulsion zone;

A denitration based on SNCR is carried out at furnace outlet;

Carry out the secondary denitration based on SCR after flue gas after once desulfurization in stove and a denitration carries out high-temperature dust removal, the temperature of high-temperature dust removal is more than 360 DEG C;

Flue gas heat exchange after secondary denitration is to normal exhaust gas temperature (130-140 DEG C) and enter cold precipitator and carry out final dusting;

Flue gas after final dusting is sent into desulphurization system and is carried out secondary desulfuration.

In order to realize said method, and effectively adapt to various different actual condition, the utility model provides a kind of ultra-clean exhaust system for fluidized-bed combustion boiler, as shown in Figure 1, comprise the desulfuration in furnace device 17 being arranged in fluidized-bed combustion boiler emulsion zone, desulfuration in furnace device 17 is positioned at the bottom of burner hearth 16, is connected with air compartment 18 bottom burner hearth 16, and air compartment 18 is communicated with providing the pressure fan 17 of air distribution for boiler.SNCR device 15 is arranged in 800 ~ 1050 DEG C of regions that burner hearth 16 exports.

SNCR device 15 exports and connects separator 14, and material returning device 19 tieback is passed through to fluidized-bed combustion boiler emulsion zone in the bottom of separator 14.The flue gas going out separator 14 accesses hot precipitator 11 successively after superheater 13 and economizer 12, and hot precipitator 11 is arranged in economizer 12 flue-gas temperature 360 DEG C of regions afterwards, and efficiency of dust collection design is not less than 90%.The exhanst gas outlet of hot precipitator 11 is connected with SCR device 22, the exhanst gas outlet of SCR device 22 is connected with air preheater 7, air preheater 7 is for reducing flue-gas temperature and heat recovery, and pressure fan 8 connects air preheater 7, and air preheater 7 connects air compartment 18 by fluidized wind air channel 20.The exhanst gas outlet of air preheater 7 is connected with the smoke inlet of cold precipitator 6, and cold precipitator 6 is normal exhaust gas temperature region after being arranged in air preheater 7.The exhanst gas outlet of cold precipitator 6 is connected with the smoke inlet of desulphurization system 1 and on connecting line, is provided with air-introduced machine 23 and booster fan 26, the connecting line of air-introduced machine 23 and booster fan 26 is provided with gas baffle 3 25, the flue gas going out desulphurization system 1 drains into chimney; Clean flue gas generator 3 is set in addition, and gas baffle 22 is set, for promoting desulphurization system exit gas temperature, to ensure the diffusivity of flue gas.

For adapting to different operating mode, SCR device 22 has been arranged in parallel SCR bypass 10, SCR bypass 10 and the smoke inlet connecting line of SCR device 22 there is gas baffle 4 21, SCR bypass 10 and the exhanst gas outlet connecting line of SCR device 22 have gas baffle 59, and described SCR bypass 10, gas baffle 4 21 and gas baffle 59 move back switching for the throwing realizing SCR device 22; Described desulphurization system 1 has been arranged in parallel desulphurization system bypass 24, desulphurization system bypass 24 is arranged between gas baffle 3 25 and gas baffle 1, and described desulphurization system bypass 24, gas baffle 3 25 and gas baffle 1 move back switching for the throwing realizing desulphurization system 1.

Operation principle of the present utility model is:

Fuel burns in CFBB, and desulfurizing agent is fed by boiler emulsion zone desulfuration in furnace device 17, carries out once desulfurization in stove; Combustion product gases flow to burner hearth 16 when exporting, and carries out a denitration, slough most of NO by SNCR device 15 x; After desulfuration in furnace and a denitration, flue gas enters hot precipitator 11 and carries out one-time dedusting after superheater 13, economizer 12, the flue dust of removing about 90%; High-temperature flue gas enters SCR device 22 and carries out secondary denitration to make emission compliance afterwards, and because flue-gas temperature is herein still more than 360 DEG C, therefore catalyst can use comparatively matured product, and choice is larger; The complete flue gas of denitration enters air preheater 7 subsequently and carries out heat exchange, and the flue gas of normal exhaust gas temperature enters cold precipitator 6 and carries out final dusting to make emission compliance afterwards; Flue gas after dedusting enters desulphurization system 1 and carries out secondary desulfuration to make emission compliance; Final ultra-clean flue gas drains into air by chimney 5.

Under nominal situation, close SCR by-pass damper 10, desulphurization system bypass 24, open gas baffle 59, gas baffle 4 21, gas baffle 1, gas baffle 3 25, regulate chimney entrance flue gas temperature, to increase flue gas diffusivity by gas baffle 22;

When desulfuration in furnace, SNCR denitration can reach discharge index, open SCR by-pass damper 10, desulphurization system bypass 24, close gas baffle 59, gas baffle 4 21, gas baffle 1, gas baffle 3 25, chimney entrance flue gas temperature is regulated, to increase flue gas diffusivity by gas baffle 22;

By adjustment desulfuration in furnace, SNCR denitration efficiency, the conveniently adjusted desulfuration in furnace of native system, denitration and external desulfurzation, denitration ratio, to reach the highest optimum operating condition of whole system comprehensive energy efficiency.

Because native system adopts high and low temperature dust arrester to carry out two-stage dedusting, efficiency of dust collection is higher; SCR device 22 is arranged in hot precipitator 11 exit region simultaneously, and flue dust is less, and catalyst operating environment is better, and life cycle is long; And SCR work cigarette temperature is still higher, catalyst comparative maturity, choice is large; The reaction volume that adopt SNCR+SCR mode denitration efficiency high (40 ~ 80%), cost of investment is lower slightly, operating cost is lower slightly (reducing agent, a small amount of catalyst), amount of ammonia slip is low, significantly can reduce SCR; The ammonia of escaping can, with the SCR system in flue gas flow direction downstream, make its utilization rate reactivity more complete, and reducing agent can use urea to replace more dangerous liquefied ammonia; Thus, while making system run all right, economy strengthen, the escaping of ammonia reduces greatly; Native system adopts desulfuration in furnace in conjunction with external desulfurzation system two-step desulfurization, adds SO 2the controllability of discharge, external desulfurzation is the recyclable byproduct (ammonium sulfate, gypsum etc.) with certain economic value also, reduces desulphurization system operating cost.

Thus, native system has native system and has that denitration efficiency is high, desulfuration efficiency is high, system reliability is high, adaptability for working condition is strong, NO x, SO 2the advantages such as discharge controllability is good, the cycle of operation is long, operating cost is low.

Above an example of the present utility model has been described in detail, but content being only preferred embodiment of the present utility model, can not thinking for limiting practical range of the present utility model.All changes and improvement etc. made according to the utility model application range, all should still belong within protection covering scope of the present utility model.

Claims (8)

1. the ultra-clean exhaust system for fluidized-bed combustion boiler, comprise the desulfuration in furnace device (17) that is arranged in fluidized-bed combustion boiler emulsion zone and be arranged in the SNCR device (15) that burner hearth (16) exports, it is characterized in that, described SNCR device (15) outlet connects separator (14), the flue gas going out separator (14) accesses hot precipitator (11) successively after superheater (13) and economizer (12), the exhanst gas outlet of hot precipitator (11) is connected with SCR device (22), the exhanst gas outlet of SCR device (22) is connected with air preheater (7), the exhanst gas outlet of air preheater (7) is connected with the smoke inlet of cold precipitator (6), the exhanst gas outlet of cold precipitator (6) is connected with the smoke inlet of desulphurization system (1) and on connecting line, is provided with air-introduced machine (23) and booster fan (26), the connecting line of air-introduced machine (23) and booster fan (26) is provided with gas baffle three (25), the flue gas going out desulphurization system (1) drains into chimney and on pipeline, arranges the clean flue gas generator (3) for promoting flue-gas temperature.
2. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, described SCR device (22) has been arranged in parallel SCR bypass (10), SCR bypass (10) and the smoke inlet connecting line of SCR device (22) there is gas baffle four (21), SCR bypass (10) and the exhanst gas outlet connecting line of SCR device (22) have gas baffle five (9), and described SCR bypass (10), gas baffle four (21) and gas baffle five (9) move back switching for the throwing realizing SCR device (22); Described desulphurization system (1) has been arranged in parallel desulphurization system bypass (24), desulphurization system (1) is arranged between gas baffle three (25) and gas baffle one (4), and described desulphurization system bypass (24), gas baffle three (25) and gas baffle one (4) move back switching for the throwing realizing desulphurization system (1).
3. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, described burner hearth (16) bottom is connected with air compartment (18), and pressure fan (8) air feed is by leading to air compartment (18) after air preheater (7) preheating.
4. according to claim 3 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, material returning device (19) tieback is passed through to fluidized-bed combustion boiler emulsion zone in the bottom of described separator (14).
5. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, described SNCR device (15) is arranged in burner hearth (16) outlet 800 ~ 1050 DEG C of regions, and described desulfuration in furnace device (17) is arranged in the bottom of burner hearth (16).
6. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, described hot precipitator (11) is arranged in economizer (12) flue-gas temperature 360 DEG C of regions afterwards, efficiency of dust collection design is not less than 90%, after described air preheater (7) is arranged in SCR device (22), for reducing flue-gas temperature and heat recovery, described cold precipitator (6) is normal exhaust gas temperature region after being arranged in air preheater (7).
7. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, described desulphurization system (1) adopts the ammonia process of desulfurization or wet limestone-gypsum FGD.
8. according to claim 1 for the ultra-clean exhaust system of fluidized-bed combustion boiler, it is characterized in that, between described clean flue gas generator (3) and the flue gas going out desulphurization system (1), be provided with gas baffle two (2).
CN201420784348.XU 2014-12-11 2014-12-11 A kind of ultra-clean exhaust system for fluidized-bed combustion boiler CN204395778U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104437082A (en) * 2014-12-11 2015-03-25 中国华能集团清洁能源技术研究院有限公司 Ultra-clean discharge system and method for fluidized bed boiler
CN105485894A (en) * 2015-12-23 2016-04-13 杭州燃油锅炉有限公司 Pulverized coal type water heating boiler
CN105498473A (en) * 2015-11-25 2016-04-20 广东电网有限责任公司电力科学研究院 Wet method flue gas desulfurizing system and circulating fluidized bed boiler system
CN105664688A (en) * 2016-04-15 2016-06-15 北京宜泽环保科技有限责任公司 Flue gas comprehensive denitration treatment system and treatment technology
CN108332193A (en) * 2018-01-10 2018-07-27 清华大学 A kind of coal-burned industrial boiler burning of super burn gas cleaning and flue gas purification system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104437082A (en) * 2014-12-11 2015-03-25 中国华能集团清洁能源技术研究院有限公司 Ultra-clean discharge system and method for fluidized bed boiler
CN105498473A (en) * 2015-11-25 2016-04-20 广东电网有限责任公司电力科学研究院 Wet method flue gas desulfurizing system and circulating fluidized bed boiler system
CN105485894A (en) * 2015-12-23 2016-04-13 杭州燃油锅炉有限公司 Pulverized coal type water heating boiler
CN105664688A (en) * 2016-04-15 2016-06-15 北京宜泽环保科技有限责任公司 Flue gas comprehensive denitration treatment system and treatment technology
CN108332193A (en) * 2018-01-10 2018-07-27 清华大学 A kind of coal-burned industrial boiler burning of super burn gas cleaning and flue gas purification system

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