CN104792007A - Horizontal type chain grate heat medium heater capable of coupling side wall staging air and flue gas recirculation - Google Patents

Horizontal type chain grate heat medium heater capable of coupling side wall staging air and flue gas recirculation Download PDF

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Publication number
CN104792007A
CN104792007A CN201510228465.7A CN201510228465A CN104792007A CN 104792007 A CN104792007 A CN 104792007A CN 201510228465 A CN201510228465 A CN 201510228465A CN 104792007 A CN104792007 A CN 104792007A
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air
flue gas
chain grate
combustion
grate
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CN201510228465.7A
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CN104792007B (en
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凌忠钱
况敏
谭立武
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Wuxi Space Clear Environmental Project Equipment Co Ltd
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Wuxi Space Clear Environmental Project Equipment Co Ltd
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Abstract

The invention discloses a horizontal type chain grate heat medium heater capable of coupling side wall staging air and smoke recirculation. The horizontal type chain grate heat medium heater is composed of a scraper coal feeder, a combustion chamber, a chain grate, a horizontal type heater body and a rear smoke channel. According to the horizontal type chain grate heat medium heater, staging air is distributed on the two side walls of the horizontal type chain grate heat medium heater, and meanwhile primary air is supplied in sections under the grate to build the staging combustion conditions in the heater; smoke is extracted from the position, between a waste heat boiler and an air preheater, of the rear smoke channel and fed into multiple primary chambers located on the front portion of the chain grate to organize smoke recycling. Accordingly, on one hand, the retention time of coal particles in the heater in a combustion state of being far away from the stoichiometric ratio is prolonged; on the other hand, in a coal seam combustion area, the oxygen concentration is diluted, the combustion temperature is lowered, the combustion intensity is weakened, therefore, the combustion process is delayed, and finally the low NOx combustion in the coal-fired horizontal type chain grate heat medium heater is achieved.

Description

A kind of horizontal chain grate hot Media Oven of be coupled side wall classification wind and flue gas recirculation
Technical field
The present invention relates to a kind of coal-fired hot Media Oven, be specifically related to a kind of horizontal chain grate hot Media Oven of be coupled side wall classification wind and flue gas recirculation, belong to combustion of industrial boiler technical field.
Background technology
Hot Media Oven is that a kind of heat often utilizing fuel combustion to produce carrys out heated organic heat carrier (i.e. heating agent, also known as conduction oil) equipment, heating equipment is transported to after heating agent is heated, got back in hot Media Oven by oil circulating pump again after release heat and heat, so go round and begin again, form a complete loop heating system.Compared with utilizing Steam Heating with conventional boiler, the hot Media Oven advantage such as the high and operating pressure of homogeneous heating, temperature-controlled precision is low that utilizes heating medium for heating to have, thus hot Media Oven is widely used in the industries such as printing and dyeing, chemical fibre, packaging, food and building materials at present.
Based on the primary energy occurrence condition of China's " rich coal, oil starvation, weak breath ", hot Media Oven many employings coal is fuel, and arranges and many employing horizontal chamber furnace (oven) outfit positive turning chain furnace rows on combustion system at burner hearth.Surround narrow combustion chamber by traveling-grate stoker, front chimney arch and rear chimney arch, arch top, front and back is the large radiation heat transfer zone being covered with heat medium pipe.The traveling-grate stoker combustion system adopted is based on fire grate grate firing, and the required all air of designed combustion are fed by an air compartment multiple bottom fire grate, i.e. for once wind, Secondary Air without fractional combustion.In actual motion, for ensureing the better after-flame in coal seam, all sending into high wind in fire grate burning early stage and primary zone, making a large amount of fuel bound nitrogen in stove separate out under oxygen-enriched atmosphere and be oxidized to NO x, cause most coal-fired traveling-grate stoker hot Media Oven NO xdischarge reaches about 400mg/m 3(folding 9%O 2) this higher level.According to new " emission standard of air pollutants for boilers " (GB13271 – 2014), the chain furnace NO of key area xthe highest permission concentration of emission is 200mg/m 3(folding 9%O 2).How under the condition ensureing after-flame, significantly to reduce chain furnace NO xdischarge, this has become current industrial boiler NO xa difficult problem for emission reduction work.The SCR huge with one-time investment compares with the SNCR that need continue to drop into higher operating cost, and low nitrogen burning is undoubtedly coal-burning boiler NO in economy xthe first-selection reduced discharging, but up to the present, the coal-fired traveling-grate stoker hot Media Oven with low nitrogen burning feature yet there are no open report.
Summary of the invention
The object of the invention is the coal burning horizontal traveling-grate stoker hot Media Oven NO mentioned to solve background technology xdischarge high problem, and then provide a kind of horizontal chain grate hot Media Oven of be coupled side wall classification wind and flue gas recirculation.
Compared to prior art, in the present invention, horizontal chain grate hot Media Oven realizes low NO xthe principle of burning is: 1) build air classification condition.Adopt air zoning method air distribution in fire grate combustion zone, be in both walls at fire grate top certain altitude simultaneously and arrange classification wind, make Volatile, catch fire and burn be in earlier stage in oxygen-lean atmosphere under carry out, under oxygen-lean atmosphere, the fuel bound nitrogen of release is changed into N 2but not be oxidized to NO x; 2) flue gas recirculation is organized in fire grate combustion zone.The flue gas extracting about 250 DEG C from back-end ductwork position between waste heat boiler and air preheater sends into fire grate several air compartment anterior, participates in burn through fire grate after this flue gas is mixed with wind facies in air compartment, play in coal combustion district and dilute oxygen concentration, reduction ignition temperature and combustion intensity, postponement flame mechanism and reduce NO xgenerate.
The technical scheme that the present invention solves the problems of the technologies described above is: a kind of horizontal chain grate hot Media Oven of be coupled side wall classification wind and flue gas recirculation, by Scraper, combustion chamber, traveling-grate stoker, horizontal body of heater and back-end ductwork composition, described combustion chamber is by front chimney arch, rear chimney arch and described traveling-grate stoker enclose and form, described horizontal chamber furnace (oven) body is positioned at above described combustion chamber, in it, space arranges that heating agent is restrained in a large number, and be divided into large space heating agent radiation heat transfer district and heating agent heat convection district, little space successively along the flow direction of flue gas, described back-end ductwork is successively connected with waste heat boiler and air preheater, described traveling-grate stoker lower disposed has multiple air compartment arranged in " one " word, the outlet of a described multiple air compartment communicates with described traveling-grate stoker, in order to supply the First air needed for coal combustion, described horizontal chain grate hot Media Oven is also arranged symmetrically with multiple classification wind snout being in both walls apart from described traveling-grate stoker top certain altitude, described multiple classification wind snout along described chain fire-gate direct of travel in " one " word arrange and with described combustion chamber, for passing into classification wind, described horizontal chain grate hot Media Oven also extracts flue gas in the position of described back-end ductwork between described waste heat boiler and described air preheater, described flue gas be admitted to described traveling-grate stoker front portion several described in an air compartment, for organizing flue gas recirculation in coal combustion district.
Further, described classification wind snout to have a down dip 15 ~ 30 ° of angles relative to horizontal direction, and its blast velocity control is within the scope of 40 ~ 60m/s.
Further, the First air entering a described air compartment, the classification wind entering described classification wind snout, the flue gas recycled entering a multiple air compartment is all adjustable; Primary air ratio, classification wind rate and flue gas recycled rate control respectively in 80 ~ 85%, 15 ~ 20% and 15 ~ 25% scopes, burn under making coal seam be in the weak reducing atmosphere of excess air coefficient about 1.0 ~ 1.1, thus suppress NOx to generate.
Further, described First air and flue gas recycled need adopt segmentation dispensing method in described multiple First air indoor.
Further, described segmentation dispensing method is as follows: several air compartment of front portion along described traveling-grate stoker direct of travel send into the First air of all flue gas recycleds and about 30%, several air compartment of middle part send into the First air of about 50%, and several air compartment of rear portion send into the First air of residue about 20%.
The Appropriate application of fractional combustion and flue gas recirculation all can realize NO xreduce discharging more than 30%.The horizontal chain grate hot Media Oven of a kind of be coupled side wall classification wind and flue gas recirculation that the present invention proposes, side wall air staged combustion technology and fire grate district flue gas recirculating technique are coordinated coupling, and existing coal-fired hot Media Oven can be about 400mg/m by expectation 3(folding 9%O 2) NO xinitial concentration reduces discharging extremely not higher than 250mg/m 3(folding 9%O 2), thus solve horizontal chain grate hot Media Oven NO prior art from burned angle xdischarge too high problem.
Accompanying drawing explanation
Fig. 1 is chamber structure of the present invention, flow field schematic diagram (in figure, the velocity attitude of each stock air-flow all adopts arrow to mark) on burning tissues and burner hearth longitudinal section.
Fig. 2 is flow field schematic diagram (in figure, the velocity attitude of each stock air-flow all adopts arrow to mark) on the chamber structure of existing horizontal chain grate hot Media Oven, burning tissues and burner hearth longitudinal section.
Each Reference numeral implication in figure: 1-Scraper; 2-combustion chamber; 3-traveling-grate stoker; The horizontal body of heater of 4-; 5-back-end ductwork; Chimney arch before 6-; Chimney arch after 7-; 8-heating agent is restrained; 9-waste heat boiler; 10-air preheater; 11-air compartment; 12-classification wind snout.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As described in Figure 1, the horizontal chain grate hot Media Oven of coupling side wall classification wind of the present invention and flue gas recirculation, is made up of Scraper 1, combustion chamber 2, traveling-grate stoker 3, horizontal body of heater 4 and back-end ductwork 5; Described combustion chamber 2 by short and small front chimney arch 6, the short and rear chimney arch 7 that span is large and described traveling-grate stoker 3 enclose and form; Described horizontal body of heater 4 is positioned at above described combustion chamber 2, and in it, heating agent tube bank 8 is arranged in space in a large number, and is divided into large space heating agent radiation heat transfer district and heating agent heat convection district, little space successively along the flow direction of flue gas; Described back-end ductwork 5 is successively connected with waste heat boiler 9 and air preheater 10; Described traveling-grate stoker 3 lower disposed has multiple air compartment 11 arranged in " one " word, and the outlet of a described multiple air compartment 11 communicates with described traveling-grate stoker 3, in order to supply the First air needed for coal combustion; Described combustion chamber 2 is also in both walls at distance fire grate top certain altitude and is arranged symmetrically with multiple classification wind snout 12, for passing into classification wind, described multiple classification wind snout 12 arranges along the direct of travel of described traveling-grate stoker 3 in " one " word and is communicated with described combustion chamber 2, and this is different from the classification wind arrangement (namely putting classification wind at forward and backward wall paper) of conventional chain furnace; Described horizontal chain grate hot Media Oven also extracts flue gas in the position of described back-end ductwork 5 between described waste heat boiler 9 and described air preheater 10, described flue gas be admitted to described traveling-grate stoker 3 front portion several described in an air compartment 11, for organizing flue gas recirculation in coal combustion district.
Described classification wind snout 12 to have a down dip 15 ~ 30 ° of angles relative to horizontal direction, and its vent wind speed controls within the scope of 40 ~ 60m/s.
Enter the First air of a described air compartment 11, enter the classification wind of described classification wind snout 12, to enter the flue gas recycled of a multiple air compartment 11 all adjustable; Primary air ratio, classification wind rate and flue gas recycled rate control respectively in 80 ~ 85%, 15 ~ 20% and 15 ~ 25% scopes, burn under making coal seam be in the weak reducing atmosphere of excess air coefficient about 1.0 ~ 1.1, thus suppress NOx to generate.
Described First air and flue gas recycled need adopt segmentation dispensing method when delivering to a described multiple air compartment 11, namely the First air of all flue gas recycleds and about 30% is sent into along several air compartments of front portion 11 (preheating in corresponding coal seam, drying and Volatile region) of described traveling-grate stoker 3 direct of travel, several air compartments 11 (primary zone that corresponding volatile matter catches fire and coke burns) of middle part send into the First air of about 50%, and the some air compartments 11 (corresponding burning-out zone) in rear portion send into the First air of residue about 20%.
The present invention is applicable to various coal burning horizontal traveling-grate stoker hot Media Oven.The foregoing is only better case study on implementation of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.

Claims (5)

1. the horizontal chain grate hot Media Oven of be coupled side wall classification wind and flue gas recirculation, by Scraper (1), combustion chamber (2), traveling-grate stoker (3), horizontal body of heater (4) and back-end ductwork (5) composition, described combustion chamber (2) is by front chimney arch (6), rear chimney arch (7) and described traveling-grate stoker (3) enclose and form, described horizontal body of heater (4) is positioned at top, described combustion chamber (2), in it, heating agent tube bank (8) is arranged in space in a large number, and be divided into large space heating agent radiation heat transfer district and heating agent heat convection district, little space successively along the flow direction of flue gas, described back-end ductwork (5) is successively connected with waste heat boiler (9) and air preheater (10), described traveling-grate stoker (3) lower disposed has multiple air compartment (11) arranged in " one " word, the outlet of a described multiple air compartment (11) communicates with described traveling-grate stoker (3), in order to supply the First air needed for coal combustion, it is characterized in that: described horizontal chain grate hot Media Oven is also arranged symmetrically with multiple classification wind snout (12) being in both walls apart from described traveling-grate stoker (3) top certain altitude, described multiple classification wind snout (12) arranges and be communicated with described combustion chamber (2) along the direct of travel of described traveling-grate stoker (3) in " one " word, for passing into classification wind, described horizontal chain grate hot Media Oven also extracts flue gas in the position of described back-end ductwork (5) between described waste heat boiler (9) and described air preheater (10), described flue gas is admitted to an air compartment (11) described in anterior several of described traveling-grate stoker (3), for organizing flue gas recirculation in coal combustion district.
2. there is the horizontal chain grate hot Media Oven of side wall classification wind and flue gas recirculation as claimed in claim 1, it is characterized in that: described classification wind snout (12) to have a down dip 15 ~ 30 ° of angles relative to horizontal direction, and its vent wind speed controls within the scope of 40 ~ 60m/s.
3. the horizontal chain grate hot Media Oven of coupling side wall classification wind as claimed in claim 1 and flue gas recirculation, is characterized in that: enter the First air of a described air compartment (11), enter the classification wind of described classification wind snout (12), to enter the flue gas recycled of a multiple air compartment (11) all adjustable; Primary air ratio, classification wind rate and flue gas recycled rate control respectively in 80 ~ 85%, 15 ~ 20% and 15 ~ 25% scopes, burn under making coal seam be in the weak reducing atmosphere of excess air coefficient about 1.0 ~ 1.1, thus suppress NOx to generate.
4. the horizontal chain grate hot Media Oven of coupling side wall classification wind as claimed in claim 3 and flue gas recirculation, is characterized in that: described First air and flue gas recycled adopt segmentation dispensing method in described multiple air compartment (11) domestic demand.
5. the horizontal chain grate hot Media Oven of coupling side wall classification wind as claimed in claim 4 and flue gas recirculation, it is characterized in that: described segmentation dispensing method is as follows: several air compartment (11) of front portion along described traveling-grate stoker (3) direct of travel send into the First air of all flue gas recycleds and about 30%, several air compartment (11) of middle part send into the First air of about 50%, and several air compartment (11) of rear portion send into the First air of residue about 20%.
CN201510228465.7A 2015-05-07 2015-05-07 It is a kind of to couple side wall classification wind and the horizontal chain grate hot Media Oven of flue gas recirculation Active CN104792007B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105674555A (en) * 2016-03-23 2016-06-15 沧州欧科联合热能技术服务有限公司 Horizontal single-return-stroke gas-fired hot water boiler
CN106090885A (en) * 2016-07-30 2016-11-09 华南理工大学 A kind of Novel flue gas EGR being applied to biomass layer burner
CN106765242A (en) * 2016-11-22 2017-05-31 上海交通大学 A kind of combined biomass clean and effective combustion system

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Publication number Priority date Publication date Assignee Title
DE4007849A1 (en) * 1990-03-12 1991-09-19 Hermann Hofmann Furnace for burning solid fuel - has flow of primary and secondary air controlled independently of each other
CN1928429A (en) * 2005-09-08 2007-03-14 沈阳国叶热电有限公司 Combustion method for fixed bed coal boiler and dedicated chain boiler for same
CN201382408Y (en) * 2009-04-07 2010-01-13 陈静 Boiler flue gas recirculation device
CN203533537U (en) * 2013-09-11 2014-04-09 林旭虹 Chain-grate boiler with gas fume recirculation
CN104296128A (en) * 2014-07-24 2015-01-21 泉州市天龙环境工程有限公司 Device and method for reducing nitrogen oxide (NOx) emission by recycling exhaust gas of chain-grate boiler
CN104566337A (en) * 2014-12-26 2015-04-29 河南农业大学 Novel hearth structure of biomass chain boiler
CN205002381U (en) * 2015-05-07 2016-01-27 无锡宇澄环境工程设备有限公司 Hierarchical wind of coupling side wall and gas recirculation's horizontal traveling grate stoker heat medium stove

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007849A1 (en) * 1990-03-12 1991-09-19 Hermann Hofmann Furnace for burning solid fuel - has flow of primary and secondary air controlled independently of each other
CN1928429A (en) * 2005-09-08 2007-03-14 沈阳国叶热电有限公司 Combustion method for fixed bed coal boiler and dedicated chain boiler for same
CN201382408Y (en) * 2009-04-07 2010-01-13 陈静 Boiler flue gas recirculation device
CN203533537U (en) * 2013-09-11 2014-04-09 林旭虹 Chain-grate boiler with gas fume recirculation
CN104296128A (en) * 2014-07-24 2015-01-21 泉州市天龙环境工程有限公司 Device and method for reducing nitrogen oxide (NOx) emission by recycling exhaust gas of chain-grate boiler
CN104566337A (en) * 2014-12-26 2015-04-29 河南农业大学 Novel hearth structure of biomass chain boiler
CN205002381U (en) * 2015-05-07 2016-01-27 无锡宇澄环境工程设备有限公司 Hierarchical wind of coupling side wall and gas recirculation's horizontal traveling grate stoker heat medium stove

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105674555A (en) * 2016-03-23 2016-06-15 沧州欧科联合热能技术服务有限公司 Horizontal single-return-stroke gas-fired hot water boiler
CN106090885A (en) * 2016-07-30 2016-11-09 华南理工大学 A kind of Novel flue gas EGR being applied to biomass layer burner
CN106765242A (en) * 2016-11-22 2017-05-31 上海交通大学 A kind of combined biomass clean and effective combustion system
CN106765242B (en) * 2016-11-22 2019-07-12 上海交通大学 A kind of combined biomass clean and effective combustion system

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