CN205807453U - A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission - Google Patents

A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission Download PDF

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Publication number
CN205807453U
CN205807453U CN201620487524.2U CN201620487524U CN205807453U CN 205807453 U CN205807453 U CN 205807453U CN 201620487524 U CN201620487524 U CN 201620487524U CN 205807453 U CN205807453 U CN 205807453U
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China
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air
flue gas
fan
spreader
stoker
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Expired - Fee Related
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CN201620487524.2U
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Chinese (zh)
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曾宪阳
凌忠钱
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China Jiliang University
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China Jiliang University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model discloses a kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission, including traveling-grate stoker, spreader feeder, burner hearth, drum, economizer, air preheater, cleaner unit, desulfurizing tower, air-introduced machine, chimney, primary air fan, overfire air fan and gas recirculating fan;A multiple air compartment is arranged at traveling-grate stoker bottom;Primary air fan preheats through air preheater after sucking air, forms First air, sends in each air compartment;Overfire air fan extracts the air after preheating from First air pipeline, forms secondary wind, sends into burner hearth and spreader feeder.At flue between cleaner unit and desulfurizing tower, draw a flue gas recirculation main pipeline, gas recirculating fan is installed;At gas recirculating fan outlet main pipeline, connect two flue gas recycled subtubes, respectively flue gas recycled is sent into an air compartment and overfire air fan entrance.This utility model cost of investment is low, and the transformation cycle is short, it is possible to reduce NOx emission more than 50%.

Description

A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission
Technical field
This utility model relates to a kind of spreader stoker chain boiler, is specifically related to a kind of employing flue gas recirculation and reduces NOx row The spreader stoker chain boiler put, belongs to Industrial Boiler environmental technology field.
Background technology
Chain furnace is widely used in China's coal-burned industrial boiler, is the major way of industrial boilers in China combustion apparatus, Account for the 60% of Industrial Boiler total amount.Chain furnace often uses in town dweller concentration zones, and mostly is low-altitude discharged so that industry pot Stove is to surrounding, and particularly town environment pollutes and is particularly acute, and the share that NOx occupies in pollutant is bigger.As chain The one of bar oven, spreader stoker chain boiler grows up on the basis of forward chain grate boiler, passes through traveling-grate stoker Mechanical wind-force in reversion and boiler front wall throws coal equipment so that pulverized coal particle layer distributed, fine-dusty coal successively on grate surface Then furnace cavity be suspended state distribution, there is the feature of chain furnace grate firing, have again the feature of suspension combustion coal-powder boiler.But by Limitation in the design of its structure, its NOx emission concentration is general all at 500mg/Nm3Above, the up to 1000mg/Nm having3With On, substantially exceed the key area chain furnace NO that " emission standard of air pollutants for boilers " (GB13271 2014) specifiesxThe highest Permission concentration of emission is 200mg/m3.Reduce chain-grate boiler NOx emission the most cost-effectively, have for alleviating atmospheric pollution Highly important meaning.
At present, the technology controlling NOx emission can be divided into two classes: a class is flue gases purification, i.e. the NOx generated It is reduced into N2, thus remove the NOx in flue gas;Another kind of is low NOx combusting technology (or denitrogenation technology in stove), is transported by boiler The improvement of line mode or the control to combustion process, the generation of NOx in suppression combustion process.But, above two class NOx emission controls Technology processed is applied to coal-fired power station boiler mostly, still lacks actual application example on Industrial Boiler.
On December 11st, 2015, Chinese Ministry of Environmental Protection, the Committee of Development and Reform, Bureau of Energy issue and " implement in full coal-burning power plant's minimum discharge and joint Can retrofit work scheme ", specify minimum discharge timetable, by complete before eastern region in the original plan the year two thousand twenty minimum discharge ( Under the conditions of benchmark oxygen content 6%, NOx emission concentration is not higher than 50mg/m3) transformation task, totally complete before being advanced to 2017. In this context, the NOx emission of coal-burned industrial boiler requires harsher, however not excluded that this discharge standard be promoted to from now on 100mg/m3.These are for the most of medium-sized and small enterprises having Industrial Boiler, and its vivosphere faces a severe challenge, and compels to be essential There is remodeling method and the technology suitably controlling NOx emission.
Summary of the invention
The purpose of this utility model is to provide a kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission and changes Make method and technology.
For achieving the above object, the technical solution of the utility model is: a kind of use flue gas recirculation to reduce NOx emission Spreader stoker chain boiler, including traveling-grate stoker, spreader feeder, burner hearth, drum, economizer, air preheater, cleaner unit, desulfurizing tower, Air-introduced machine, chimney, primary air fan, overfire air fan and gas recirculating fan;Described traveling-grate stoker lower area has multiple one Secondary air compartment;Described burner hearth back-end ductwork has been sequentially arranged economizer, air preheater, cleaner unit, desulfurizing tower, air-introduced machine and Chimney;Described primary air fan preheats through air preheater after sucking air, forms First air, sends into each air compartment In;Described overfire air fan extracts the air after preheating from First air pipeline, forms secondary wind, sends into burner hearth and spreader feeder; At flue between described cleaner unit and desulfurizing tower, drawing a flue gas recirculation main pipeline, flue gas recirculation is responsible for Road is provided with gas recirculating fan;The main pipeline of described gas recirculating fan outlet is divided into two, and connects and has two Flue gas recycled subtube, sends into each air compartment and entrance of overfire air fan respectively by flue gas recycled.
The inlet and outlet of described gas recirculating fan, is respectively arranged with valve, controls the ratio of flue gas recycled Example;In two flue gas recycled subtubes, partial fume is respectively fed to each air compartment by a subtube, passes through valve Control to send into the exhaust gas volumn of each air compartment, after this flue gas mixes with the First air in each air compartment, send into each First air The fire grate that room is corresponding;An other subtube is connected to the entrance of overfire air fan, sends into the cigarette in secondary wind by Valve controlling Gas ratio, after this partial fume mixes with secondary wind, by overfire air fan, is respectively fed to burner hearth front wall overfire air port, burner hearth Rear wall overfire air port and the coal feeding wind pipe of spreader feeder.
Described traveling-grate stoker is forward-moving grate, and lower region thereof has a multiple air compartment (4 ~ 6 air compartments), along chain The traffic direction of fire grate arranges in " one " word, and the outlet of multiple air compartments communicates with traveling-grate stoker, in order to supply traveling-grate stoker First air needed for upper coal combustion.
Described spreader feeder is mechanical wind-force coal thrower, throws coal by machinery, throws coal big for granularity at back of furnace row, grain Spend little coal and throw at fire grate anterior, it is ensured that granule coal dust is uniformly distributed on grate surface;Throw coal by wind-force, spreader feeder will be fallen into In fine breeze be blown into burner hearth.
Described First air and the ratio of secondary wind remain unchanged substantially, and primary air ratio and secondary air ratio control 80% He About 20%;The described primary air flow entering multiple air compartments, by flap valve control, air zoning is given according to a certain percentage Chain fire-gate coal combustion, its range of accommodation is between 0% ~ 100%.
In described secondary wind, after sending into burner hearth front wall overfire air port, burner hearth, wall overfire air port and spreader feeder are thrown The secondary wind ratio of coal airduct remains unchanged substantially, and its secondary wind ratio is respectively 40%, 40% and about 20%.
Described gas recirculating fan, its introduce exhaust gas volumn number, i.e. flue gas recirculation rate, according to boiler load Size, by the regulation of valve, controls to change in the range of 5.0% ~ 25%.
Described gas recirculating fan, its exhaust gas volumn introduced, it is respectively fed to two flue gas recycled subtubes, wherein Send into the exhaust gas volumn of secondary wind pipeline, account for gas recirculating fan and introduce the 0% ~ 30% of exhaust gas volumn.
The described flue gas recycled amount entering multiple air compartments is the most adjustable, and according to Actual combustion operating mode, it regulates model It is trapped among between 0% ~ 100%.
More than use flue gas recirculation to reduce spreader stoker chain boiler remodeling method and the technology of NOx emission, mainly pass through Increase a gas recirculating fan, section of tubing and valve and reduce NOx emission: (1) by multiple air compartments once The air zoning of wind, makes the Volatile of coal-burning particle, early stage of catching fire and burn be in the atmosphere of oxygen deprivation, at reproducibility gas Under atmosphere, a large amount of fuel bound nitrogens of release are changed into N2Rather than it is oxidized to NOx;(2) partial fume is introduced many by gas recirculating fan An individual air compartment, control enter multiple air compartments flue gas recycled amount, postpone coal-burning particle burning, reduce ignition temperature and Oxygen concentration, promotes that volatile matter separates out under the atmosphere of oxygen deprivation, the generation of suppression NOx;(3) gas recirculating fan is by part cigarette Pneumatic transmission enters secondary wind, reduces the concentration of oxygen in secondary wind, and secondary wind strengthens the disturbance of air-flow in burner hearth after sending into burner hearth And mixing, it is to avoid flame burns under high temperature and oxygen-enriched state, it is suppressed that a large amount of generations of suspension combustion district NOx.
A kind of spreader stoker chain boiler remodeling method using flue gas recirculation to reduce NOx emission that the utility model proposes And technology, it is not necessary to boiler is carried out bigger change, it is only necessary to increase a gas recirculating fan, partial fume pipeline, Valve and instrument, cost of investment is few, and the transformation cycle is short, can realize NOx abatement more than 50%.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In Fig. 1,1-traveling-grate stoker;2-spreader feeder;3-burner hearth;4-drum;5-economizer;6-air preheater;7-dedusting Device;8-desulfurizing tower;9-air-introduced machine;10-chimney;11-gas recirculating fan;12-primary air fan;13-overfire air fan;1# ~ Air compartment 1 ~ 4 of 4#-;A-front wall overfire air port;Wall overfire air port after b-;K1 ~ k4-flap valve 1 ~ 4;k5 ~ K11-valve 5 ~ 11.
Detailed description of the invention
With embodiment, this utility model is further described below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission, including traveling-grate stoker 1, spreader feeder 2, burner hearth 3, drum 4, economizer 5, air preheater 6, cleaner unit 7, desulfurizing tower 8, air-introduced machine 9, chimney 10, flue gas Recirculation blower 11, primary air fan 12 and overfire air fan 13;Described traveling-grate stoker 1 lower area has a multiple air compartment (1# ~ 4# is an air compartment 1 ~ 4);Described burner hearth 3 back-end ductwork economizer 5, air preheater 6, cleaner unit have been sequentially arranged 7, desulfurizing tower 8, air-introduced machine 9 and chimney 10;Described primary air fan 12 preheats through air preheater 6 after sucking air, is formed First air, sends in each air compartment (1#, 2#, 3#, 4#);Described overfire air fan 13 extracts preheating from First air pipeline After air, form secondary wind, send into burner hearth 3 and spreader feeder 2;Flue between described cleaner unit 7 and desulfurizing tower 8 Place, draws a flue gas recirculation main pipeline, is provided with gas recirculating fan 11 in flue gas recirculation main pipeline;Described cigarette At the main pipeline of gas recirculation blower 11 outlet, connect and have two flue gas recycled subtubes, respectively flue gas recycled is sent into Each air compartment (1#, 2#, 3#, 4#) and entrance of overfire air fan 13.
The inlet and outlet of described gas recirculating fan 11, is respectively arranged with valve k9 and k10, controls recirculation cigarette The ratio of gas;In two flue gas recycled subtubes, partial fume is respectively fed to each air compartment by a subtube (1#, 2#, 3#, 4#), controls to send into the exhaust gas volumn of each air compartment (1#, 2#, 3#, 4#), this flue gas by valve k5 ~ k8 After mixing with the First air in each air compartment (1#, 2#, 3#, 4#), send into each air compartment (1#, 2#, 3#, 4#) corresponding Fire grate;Another subtube is connected to the entrance of overfire air fan 13, controls to send into the cigarette in overfire air fan 13 by valve k11 Gas ratio, after this partial fume mixes with secondary wind, by overfire air fan 13, be respectively fed to burner hearth 3 front wall overfire air port a, The coal feeding wind pipe of wall overfire air port b and spreader feeder 2 after burner hearth 3.
Described traveling-grate stoker 1 is forward-moving grate, and lower region thereof has a multiple air compartment, and (1#, 2#, 3#, 4# typically have 4 ~ 6 air compartments), the traffic direction along traveling-grate stoker 1 arranges in " one " word;Multiple one time air compartment (1#, 2#, 3#, 4#) goes out Mouthful communicate with traveling-grate stoker 1, in order to supply on traveling-grate stoker 1 First air needed for coal combustion.
Described spreader feeder 2 is mechanical wind-force coal thrower, throws coal by machinery, throws coal big for granularity at traveling-grate stoker 1 Rear portion, the coal that granularity is little is thrown at traveling-grate stoker 1 anterior, it is ensured that granule coal dust is uniformly distributed on the row face of traveling-grate stoker 1;Pass through Wind-force throws coal, and the fine breeze fallen in spreader feeder 2 is blown into burner hearth 3.
Described First air and the ratio of secondary wind remain unchanged substantially, and primary air ratio and secondary air ratio control 80% He About 20%;The primary air flow of the multiple air compartment (1#, 2#, 3#, 4#) of described entrance, is controlled by flap valve k1 ~ k4, presses According to certain proportion air zoning to the coal combustion of traveling-grate stoker 1, the range of accommodation of flap valve k1 ~ k4 0% ~ 100% it Between.
In described secondary wind, send into wall overfire air port b and throwing coal after burner hearth 3 front wall overfire air port a, burner hearth 3 The secondary wind ratio of machine 2 coal feeding wind pipe remains unchanged substantially, and its secondary wind ratio is respectively 40%, 40% and about 20%.
Described gas recirculating fan 11, its introduce exhaust gas volumn number, i.e. flue gas recirculation rate, according to boiler load Size, by the regulation of valve k9, control in the range of 5.0% ~ 25% change.
Described gas recirculating fan 11, its exhaust gas volumn introduced, it is respectively fed to two flue gas recycled subtubes, its The exhaust gas volumn of middle feeding secondary wind pipeline, accounts for gas recirculating fan 11 and introduces the 0% ~ 30% of exhaust gas volumn.
The flue gas recycled amount of the multiple air compartment (1#, 2#, 3#, 4#) of described entrance is the most adjustable, according to Actual combustion Operating mode, the range of accommodation of its valve k5 ~ k8 is between 0% ~ 100%.
This utility model is applicable to spreader stoker chain boiler.The foregoing is only detailed description of the invention of the present utility model, But the various changes and modifications that those of ordinary skill in the art just can make without creative work, all in the protection of the present invention In the range of.

Claims (6)

1. use flue gas recirculation to reduce a spreader stoker chain boiler for NOx emission, including traveling-grate stoker (1), spreader feeder (2), burner hearth (3), drum (4), economizer (5), air preheater (6), cleaner unit (7), desulfurizing tower (8), air-introduced machine (9), cigarette Chimney (10), gas recirculating fan (11), primary air fan (12) and overfire air fan (13);Described traveling-grate stoker (1) lower region There is a multiple air compartment (1#, 2#, 3#, 4#) in territory;Described burner hearth (3) back-end ductwork economizer (5), air have been sequentially arranged Preheater (6), cleaner unit (7), desulfurizing tower (8), air-introduced machine (9) and chimney (10);Described primary air fan (12) sucks air After through air preheater (6) preheat, formed First air, send in each air compartment (1#, 2#, 3#, 4#);Described secondary Blower fan (13) extracts the air after preheating from First air pipeline, forms secondary wind, sends into burner hearth (3) and spreader feeder (2);Described Cleaner unit (7) and desulfurizing tower (8) between flue at, draw a flue gas recirculation main pipeline, flue gas recirculation master Pipeline is provided with gas recirculating fan (11);At the main pipeline that described gas recirculating fan (11) exports, connection has Article two, flue gas recycled subtube, sends into each air compartment (1#, 2#, 3#, 4#) and overfire air fan respectively by flue gas recycled (13) entrance.
A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission the most as claimed in claim 1, its feature exists In: the inlet and outlet of described gas recirculating fan (11), it is respectively arranged with valve (k9) and (k10), controls to follow again The ratio of ring flue gas;In two flue gas recycled subtubes, partial fume is respectively fed to each First air by a subtube Room (1#, 2#, 3#, 4#), controls to send into the exhaust gas volumn of each air compartment (1#, 2#, 3#, 4#) by valve (k5) ~ (k8), After First air in air compartment (1#, 2#, 3#, 4#) of this flue gas and each mixes, send into each air compartment (1#, 2#, 3#, 4#) corresponding fire grate;Another subtube is connected to the entrance of overfire air fan (13), controls to send into secondary by valve (k11) Flue gas ratio in blower fan (13), after this partial fume mixes with secondary wind, by overfire air fan (13), is respectively fed to burner hearth (3) front wall overfire air port (a), burner hearth (3) wall overfire air port (b) afterwards and the coal feeding wind pipe of spreader feeder (2).
A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission the most as claimed in claim 1, its feature exists In: described traveling-grate stoker (1) is forward-moving grate, and lower region thereof has a multiple air compartment (1#, 2#, 3#, 4# room), along chain The traffic direction of fire grate (1) arranges in " one " word;The outlet of multiple air compartments (1#, 2#, 3#, 4#) and traveling-grate stoker (1) phase Logical, in order to supply the First air needed for the upper coal combustion of traveling-grate stoker (1);Enter a multiple air compartment (1#, 2#, 3#, 4#) Primary air flow, is controlled by flap valve (k1) ~ (k4), and air zoning is to the coal combustion of traveling-grate stoker (1) according to a certain percentage;Turn over The range of accommodation of plate valve (k1) ~ (k4) is between 0% ~ 100%.
A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission the most as claimed in claim 1, its feature exists In described gas recirculating fan (11), its introduce exhaust gas volumn number, i.e. flue gas recirculation rate, according to boiler load Size, by the regulation of valve (k9), controls to change in the range of 5.0% ~ 25%.
A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission the most as claimed in claim 1, its feature exists In: described gas recirculating fan (11), its exhaust gas volumn introduced, it is respectively fed to two flue gas recirculation subtubes, wherein Send into the exhaust gas volumn of secondary wind pipeline, account for gas recirculating fan (11) and introduce the 0% ~ 30% of exhaust gas volumn.
A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission the most as claimed in claim 1, its feature exists In: the flue gas recycled amount of the multiple air compartments (1#, 2#, 3#, 4#) described in entrance is the most adjustable, according to Actual combustion operating mode, The range of accommodation of its valve (k5) ~ (k8) is between 0% ~ 100%.
CN201620487524.2U 2016-05-26 2016-05-26 A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission Expired - Fee Related CN205807453U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106051748A (en) * 2016-05-26 2016-10-26 中国计量学院 Coal thrower chain boiler for reducing NOx emission through flue gas recirculation
CN106594710A (en) * 2016-12-19 2017-04-26 哈尔滨工业大学 Independent partitioned grate firing flue gas circulation combustion system and use method thereof
CN108980818A (en) * 2018-06-07 2018-12-11 北京奥科瑞丰节能技术有限公司 The chain grate biomass boiler and control method of nitrogen oxides low emission

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106051748A (en) * 2016-05-26 2016-10-26 中国计量学院 Coal thrower chain boiler for reducing NOx emission through flue gas recirculation
CN106594710A (en) * 2016-12-19 2017-04-26 哈尔滨工业大学 Independent partitioned grate firing flue gas circulation combustion system and use method thereof
CN108980818A (en) * 2018-06-07 2018-12-11 北京奥科瑞丰节能技术有限公司 The chain grate biomass boiler and control method of nitrogen oxides low emission

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