CN204574001U - A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation - Google Patents
A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation Download PDFInfo
- Publication number
- CN204574001U CN204574001U CN201520142942.3U CN201520142942U CN204574001U CN 204574001 U CN204574001 U CN 204574001U CN 201520142942 U CN201520142942 U CN 201520142942U CN 204574001 U CN204574001 U CN 204574001U
- Authority
- CN
- China
- Prior art keywords
- front wall
- rear wall
- air
- air nozzle
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
Abstract
The utility model discloses a kind of low NO of be coupled fractional combustion and flue gas recirculation
xchain furnace, this chain furnace is by burner hearth, feeder, traveling-grate stoker, slag bucket and back-end ductwork composition, its burner hearth is by front, rear chimney arch is divided into, lower hearth two parts, Secondary Air and the burnout degree fractional combustion in order to tissue suspension combustion zone is arranged in lower hearth suspension combustion district, its Secondary Air is by before being positioned at, the overfire air port in region, rear chimney arch middle and lower part feeds, burnout degree is by being positioned at, the fire air nozzle of lower hearth intersection is sent into, below fire grate, segmentation feeds First air to organize the fractional combustion of fire grate combustion zone, extract low-temperature furnace smoke from back-end ductwork and send into fire grate bottom tissue flue gas recirculation via recirculation blower, by means of fire grate combustion zone and the two-layer fractional combustion in suspension combustion district and the flue gas recirculation of fire grate combustion zone, the coal particle in stove is made to be in away from stoichiometric ratio fired state for a long time, realize the efficient low NO of chain furnace
xburning.
Description
Technical field
The utility model relates to a kind of chain furnace, is specifically related to a kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation, belongs to combustion of industrial boiler technical field.
Background technology
In the coal-burned industrial boiler of current China One's name is legion, shared by chain furnace, the market share is more than 60%.On combustion method, chain furnace to be advanced fire grate grate firing based on constant speed, is aided with the suspension combustion that in fire grate upper area, fine particle builds.Correspondingly, its air distribution occupies with the First air sent into bottom fire grate and to encircle Secondary Air before and after leading, fire grate top for auxiliary (for supplying the needs of air needed for suspension combustion district and adjustment burning); Preheating and drying, Volatile and burning, coke burning and after-flame several stage is successively experienced in view of advancing with fire grate in coal seam on fire grate, fire grate bottom First air often adopts the form of separating chamber to feed, so as with flame mechanism need adjust each region to air quantity.From burning theory, distribute and the distribution of First air between each air compartment in fire grate bottom by means of rational primary and secondary air, chain furnace can avoid NO in theory
xa large amount of generations.But in actual motion, for ensureing fire grate grate firing and the better after-flame of suspension combustion (control ash, slag combustible content and avoid chimney over-emitting black exhaust), need high wind be sent in the high temperature suspension combustion district on fire grate burning early stage and primary zone and fire grate top, make a large amount of fuel bound nitrogen in stove separate out under oxygen-enriched atmosphere and be oxidized to NO
x, cause most chain furnace NO
xdischarge reaches about 400 ~ 500mg/m
3this 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.Along with the ecological requirements of rapid economic development and increasingly stringent, do not get rid of and from now on this discharge standard is promoted to 100mg/m
3.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.At present, in stove, after low nitrogen burning and stove, tail flue gas denitration (SCR or SNCR) is the NO of main flow
xemission control means.In denitration technology transformation, these three kinds of means have been widely used in the coal-powder boiler adopting suspension combustion mode, then rarely have report for the application on grate firing chain furnace.This mainly due to: 1) at present there is no the efficient low-NO_x combustion technology being applicable to chain furnace in industry.Need bottom the fire grate of chain furnace to send into high wind to ensure slag after-flame, though suspension combustion district combustion share is lower, but its next-door neighbour's fire grate upper area and temperature is higher, by traditional idea design air stage feeding (namely fire grate air zoning and arch Secondary Air spray into suspension combustion district as classification wind) in essence and structure fractional combustion effect not yet in effect.In addition, have bibliographical information abroad, chain furnace is under conventional air distribution condition, and its suspension combustion district fuel bound nitrogen changes into the conversion ratio of NOx up to 45%, and Comparatively speaking, this conversion ratio of fire grate combustion zone is only 15%.Visible, the percent conversion in restriction fire grate combustion zone and suspension combustion district is to NO
xreduce discharging no less important; 2) SCR one-time investment and operating cost high, most chain furnace owner is difficult to bear; 3) narrow in chain furnace temperature window largely reducing SNCR denitration effect.In chain furnace stove, all comparatively coal-powder boiler is low for wind coal mixing and burning intensity, for ensure fuel better catch fire, primary zone smooth combustion and fire grate upper area better, two arch beam waist type burner chamber structures of chain furnace one general configuration uniqueness, cause in stove to be formed and have region on the arch lower area of higher temperature levels and the arch of low temperature, the temperature window (900 ~ 1050 DEG C) being applicable to SNCR exists only in this narrower region near chimney arch.Existing bibliographical information, arrange that in this region SNCR implemented by spray gun, while the relatively high operating cost of input, its denitration efficiency is generally no more than 30%.
Based on above analysis, for significantly reducing the higher NO of chain furnace
xconcentration of emission is to meet key area emission limit, and the effective and measure of economy should be first at the efficient low nitrogen burning of stove inner tissue, realizes NO
xreduce discharging to be not less than while 50% and promote chimney arch upper area cigarette temperature (can meet the temperature window of SNCR), chimney arch upper area adopts SNCR to reduce NO further thereafter
xdischarge.
Utility model content
The purpose of this utility model is the chain furnace NO mentioned to solve background technology
xdischarge high and prior art cannot realize efficient low NO
xthe problem of burning, and then provide a kind of low NO of be coupled fractional combustion and flue gas recirculation
xchain furnace.
Compared to prior art, in the utility model, chain furnace realizes low NO
xthe principle of burning is: 1) flue gas recirculation.The low-temperature furnace smoke of about 300 DEG C is extracted from boiler back end ductwork, by this stove cigarette by the air compartment below recirculation blower feeding fire grate, participates in burn through fire grate after mixed with wind facies in each air compartment, play in fire grate combustion zone and dilute oxygen concentration, reduction ignition temperature and combustion intensity, postponement flame mechanism and reduce NO
xgenerate; 2) fire grate combustion zone and suspension combustion district organizationally efficient fractional combustion respectively.Adopt air zoning and segmentation to feed flue gas recycled in fire grate combustion zone, namely a small amount of First air and a large amount of flue gas recycled is only sent in coal seam drying, Volatile and stage of catching fire, primary zone and burning-out zone send into remaining large quantity of air and a small amount of flue gas recycled again, make Volatile, catch fire and burn early stage be 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.While the above certain position in suspension combustion district arranges classification wind, reduce secondary air flow, the weak reducing atmosphere that suspension combustion district sets up is conducive to suppressing NO
xgenerate.
The technical scheme that the utility model solves the problems of the technologies described above is: a kind of coupling fractional combustion and the low NO of flue gas recirculation
xchain furnace, is made up of burner hearth, feeder, traveling-grate stoker, slag bucket and back-end ductwork; Described burner hearth is divided into upper and lower two parts by front chimney arch and rear chimney arch; Economizer and air preheater is furnished with from top to bottom in described back-end ductwork; The area of space of described traveling-grate stoker parcel is furnished with a multiple air compartment, and a multiple air compartment arranges along chain fire-gate direct of travel in " one " word, and the outlet of a described multiple air compartment communicates with described traveling-grate stoker; Described chain furnace also extracts recirculation stove cigarette at described back-end ductwork, and extract the position of recirculation stove cigarette between described economizer and described air preheater, described recirculation stove cigarette sends into an air compartment described in several via recirculation blower.Technical scheme of the present invention is illustrated further respectively for adopting the chain furnace of chain furnace and the employing spreader feeder forward-moving grate rotating forward fire grate.
For adopting the chain furnace rotating forward fire grate, the region, middle and lower part of described front chimney arch and described rear chimney arch is furnished with multiple front wall overfire air port and multiple rear wall overfire air port respectively, for passing into Secondary Air, described multiple front wall overfire air port and multiple rear wall overfire air port all arrange along stove cross direction in " one " word and are communicated with described lower furnace portion, and the position of the more described rear wall overfire air port in the position of described front wall overfire air port is high.
Further, described chain furnace is also furnished with multiple front wall fire air nozzle and multiple rear wall fire air nozzle in upper and lower burner hearth intersection, described multiple front wall fire air nozzle and multiple rear wall fire air nozzle all arrange along stove cross direction in " one " word and are communicated with described lower furnace portion, and the position of the more described rear wall fire air nozzle in the position of described front wall fire air nozzle is high.
Further, described front wall overfire air port and described rear wall overfire air port are at stove cross direction one_to_one corresponding, and described front wall fire air nozzle and described rear wall fire air nozzle are at stove cross direction one_to_one corresponding; And described front wall overfire air port and described front wall fire air nozzle on described front chimney arch in one-to-one relationship, described rear wall overfire air port and described rear wall fire air nozzle in the rear chimney arch are one-to-one relationship.
Further, described front wall overfire air port and rear wall overfire air port to have a down dip 25 ~ 40 ° of angles and 10 ~ 25 ° of angles relative to horizontal direction respectively, and described front wall fire air nozzle and rear wall fire air nozzle to have a down dip 25 ~ 40 ° of angles and 0 ~ 15 ° of angle relative to horizontal direction respectively.
Further, the First air entering a described multiple air compartment, the Secondary Air entering described front wall overfire air port and described rear wall overfire air port, enter described front wall fire air nozzle and described rear wall fire air nozzle burnout degree and to enter the recirculation stove cigarette of a multiple air compartment all adjustable.
For the chain furnace adopting spreader feeder forward-moving grate, described feeder adopts coal supply spreader feeder, and described burner hearth is provided with front wall and Hou Qiang, and described front wall root is provided with less front chimney arch; Multiple front wall overfire air port and multiple rear wall overfire air port is furnished with respectively at the lower area of described front wall and described rear wall; Be furnished with multiple front wall fire air nozzle and multiple rear wall fire air nozzle respectively in the upper zone of described front wall and described rear wall, described multiple front wall fire air nozzle and multiple rear wall fire air nozzle are arranged symmetrically with along the center line of described burner hearth.
Further, described front wall overfire air port and rear wall overfire air port to have a down dip ° angle, 25 ~ 40 ° of angle and-15 ~ 20 relative to horizontal direction respectively, and described front wall fire air nozzle and rear wall fire air nozzle to have a down dip 20 ~ 40 ° of angles relative to horizontal direction.
The beneficial effect that the utility model has compared with prior art is, realizes low NO
xwhile generating, maintenance is better caught fire, is surely fired and after-flame, and it is embodied in:
a. low NO is realized x generate.As described in the background art, in prior art by the air stage feeding (namely fire grate air zoning and arch Secondary Air spray into suspension combustion district as classification wind) of traditional idea design in essence and structure fractional combustion effect not yet in effect, thus cause existing chain furnace NO
xconcentration of emission is higher.After adopting low-NO_x combustion technology of the present utility model, chain furnace can realize: 1) fire grate combustion zone is along a large amount of generations of the fractional combustion suppression fuel type NOx of fire grate direct of travel.Adopt air zoning and segmentation to feed flue gas recycled in fire grate combustion zone, namely a small amount of First air and a large amount of flue gas recycled is only sent in coal seam drying, Volatile and stage of catching fire, primary zone and burning-out zone send into remaining large quantity of air and a small amount of flue gas recycled again, make Volatile, catch fire and burn early stage be in oxygen-lean atmosphere under carry out, the fuel bound nitrogen discharged is changed into N
2but not be oxidized to NO
x; 2) fire grate combustion zone flue gas recirculation suppresses a large amount of generations of fuel type NOx and thermal NO x.The flue gas recycled that fire grate combustion zone is sent into postpones coal particle burning, reduces the oxygen concentration of ignition temperature and locality, and it promotes that volatile matter is separated out under oxygen-lean atmosphere in addition, thus effectively inhibits NOx to generate; 3) suspension combustion district is by reducing secondary air flow and introducing well-designed burnout degree and organizational hierarchy burning, effectively inhibits a large amount of generations of suspension combustion district fuel type NOx and thermal NO x.In a word, the enforcement of fire grate combustion zone fractional combustion and flue gas recirculation, suspension combustion district fractional combustion in the utility model, make coal particle be in away from stoichiometric ratio fired state for a long time, the cigarette warm water be in addition controlled in chain furnace is put down, and will significantly reduce NO in stove
xgeneration.
b. keep catching fire in time and smooth combustion.After adopting low-NO_x combustion technology of the present utility model, chain furnace in timely ignition and steady combustion characteristic comparatively prior art possess some superiority, this be due to: 1) recycle cigarette temperature about 300 DEG C, obviously comparatively hot blast temperature (being generally no more than 150 DEG C) is high, high recirculation cigarette temperature is conducive to preheating of fuel drying and Volatile on fire grate, is conducive to catching fire in time; 2) flue gas recirculation rate general control is in about 15% this lower value, less on fire grate smooth combustion impact; 3) fire grate combustion zone adopts air zoning, is started by a large amount of First air to send into from primary zone, meets the needs that the burning of a large amount of coal particle consumes large quantity of air, is conducive to maintaining smooth combustion; 4) suspension combustion differentiation level air-distribution ratio, its primary zone time of staying and tail-off time all control in normal mode, are conducive to ensureing that suspension combustion district surely fires.
c. better after-flame effect is maintained.After adopting low-NO_x combustion technology of the present utility model, chain furnace still can maintain better after-flame effect, this is due to 1) rationalization's stove inner air-distributing under structure stove internal classification burning condition, although fire grate combustion zone excess air coefficient controls below 1, but First air is concentrated and is sent into fire grate primary zone and suitably increase fire grate burning-out zone air output, meet the needs that a large amount of coal particle burning in primary zone consumes large quantity of air, alleviate again negative effect (flue gas recirculation reduction ignition temperature and oxygen concentration to after-flame because of flue gas recirculation postponement burning, delayed combustion and suppress NOx to generate), this air distribution pattern of grate area is conducive to slag after-flame, 2) obviously comparatively hot blast temperature is high for flue gas recycled temperature, and high flue gas recycled temperature is conducive to preheating of fuel drying and Volatile on fire grate, is conducive to catching fire in time and improving after-flame, 3) the stronger burnout degree jet of rigidity is fed at suspension combustion district top proper height, imperfect combustion product good mixing in burnout degree and up high-temperature flue gas, its suitable position ensure that enough tail-off times simultaneously, thus is conducive to guaranteeing the efficient after-flame in suspension combustion district.
In coal-powder boiler, in fractional combustion and fuel oil combustion, the Appropriate application of flue gas recirculation all can realize NO
xreduce discharging more than 30%.Use for reference coal dust firing and fuel oil combustion experience, the low NO that the utility model proposes
xmode chain furnace combustion technology is by both exquisite cooperation couplings, and expectation can by NO
xinitial concentration is about 400mg/m
3reduce discharging to about 200mg/m
3, that is only can meet key area coal-fired industrial furnace NO with stove inner tissue low nitrogen burning
xdischarge standard, solves chain furnace NO in prior art
xdischarge high problem.
Accompanying drawing explanation
Fig. 1 is chamber structure of the present utility model, flow field schematic diagram on burning tissues and burner hearth longitudinal section (velocity attitude that in figure, each stock sprays into gas stream in the stove all adopts arrow to mark);
Fig. 2 is that the utility model is applicable to flow field schematic diagram on the chamber structure of spreader feeder forward-moving grate chain furnace, burning tissues and burner hearth longitudinal section (velocity attitude that in figure, each stock sprays into gas stream in the stove all adopts arrow to mark).
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
embodiment one
Composition graphs 1 illustrates present embodiment, coupling fractional combustion of the present utility model and the low NO of flue gas recirculation
xchain furnace, described chain furnace is made up of burner hearth 1, feeder 2, traveling-grate stoker 3, slag bucket 4 and back-end ductwork 5; Described burner hearth 1 is divided into upper and lower two parts by front chimney arch 7a and rear chimney arch 7b; Economizer 10 and air preheater 11 is furnished with from top to bottom in described back-end ductwork 5; The area of space that described traveling-grate stoker 3 wraps up is furnished with a multiple air compartment 6, a multiple air compartment 6 arranges along the direct of travel (from left to right) of traveling-grate stoker 3 in " one " word, the outlet of a described multiple air compartment air compartment 6 communicates with described traveling-grate stoker 3, in order to supply the First air 14 on described traveling-grate stoker 3 needed for coal combustion; Multiple front wall overfire air port 8a and multiple rear wall overfire air port 8b is furnished with respectively in the region, middle and lower part of described front chimney arch 7a and described rear chimney arch 7b, for passing into Secondary Air, described multiple front wall overfire air port 8a and multiple rear wall overfire air port 8b all arrange along stove cross direction in " one " word and are communicated with described burner hearth 1 bottom, and the position of the more described rear wall overfire air port 8b in the position of described front wall overfire air port 8a is high; Described chain furnace is also furnished with multiple front wall fire air nozzle 9a and multiple rear wall fire air nozzle 9b in upper and lower burner hearth intersection, for passing into burnout degree, described multiple front wall fire air nozzle 9a and multiple rear wall fire air nozzle 9b all arrange along stove cross direction in " one " word and are communicated with described burner hearth 1 bottom, and the position of the more described rear wall fire air nozzle 9b in the position of described front wall fire air nozzle 9a is high; Described chain furnace also extracts recirculation stove cigarette 13 in described back-end ductwork 5 position between described economizer 10 and described air preheater 11, and described recirculation stove cigarette 13 sends into an air compartment 6 described in several via recirculation blower 12.
Described front wall overfire air port 8a and described rear wall overfire air port 8b is at stove cross direction one_to_one corresponding, and described front wall fire air nozzle 9a and described rear wall fire air nozzle 9b is at stove cross direction one_to_one corresponding; And described front wall overfire air port 8a and described front wall fire air nozzle 9a on described front chimney arch 7a in one-to-one relationship, described rear wall overfire air port 8b and described rear wall fire air nozzle 9b in the rear chimney arch 7b is one-to-one relationship.
Described front wall overfire air port 8a and rear wall overfire air port 8b to have a down dip 25 ~ 40 ° of angles and 10 ~ 25 ° of angles relative to horizontal direction respectively, and described front wall fire air nozzle 9a and rear wall fire air nozzle 9b to have a down dip 25 ~ 40 ° of angles and 0 ~ 15 ° of angle relative to horizontal direction respectively.Described Secondary Air and its wind speed of described burnout degree are all within the scope of 60 ~ 100m/s.
Enter the First air 14 of a described multiple air compartment 6, enter the Secondary Air of described front wall overfire air port 8a and described rear wall overfire air port 8b, enter the burnout degree of described front wall fire air nozzle 9a and described rear wall fire air nozzle 9b and enter the recirculation stove cigarette 13 of a multiple air compartment 6 all adjustable.Primary air ratio, secondary air ratio, burnout degree rate and flue gas recycled rate control respectively in 65 ~ 80%, 10 ~ 15%, 10 ~ 20% and 10 ~ 20% scopes, fire grate combustion zone excess air coefficient about 0.75 ~ 0.85, the suspension combustion district excess air coefficient about 0.95 ~ 1.1 that Secondary Air sprays into, the burning-out zone excess air coefficient about 1.2 ~ 1.3 that burnout degree sprays into.
Certain principle need be followed at the First air 14 and its proportioning of recirculation stove cigarette 13 that enter a described multiple air compartment 6, namely along the front portion of the direct of travel of described traveling-grate stoker 3, some air compartments 6 (corresponding dry, Volatile region) send into the recirculation stove cigarette 13 of about 80% and the First air 14 of about 30%, the some air compartment in middle part 6 (corresponding volatile matter catches fire and the primary zone of coke burning) sends into the recirculation stove cigarette 13 of about 20% and the First air 14 of about 50%, and the some air compartments 6 (corresponding burning-out zone) in rear portion send into the First air 14 remaining about 20%.
embodiment two
Composition graphs 2 illustrates present embodiment, coupling air classification of the present utility model and the low NO of flue gas recirculation
xchain furnace also can be equipped with spreader feeder forward-moving grate, described chain furnace is made up of burner hearth 1, coal supply spreader feeder 15, traveling-grate stoker 3, slag bucket 4 and back-end ductwork 5, coal particle throws to the right-hand member of described traveling-grate stoker 3 by described coal supply spreader feeder 15, and described traveling-grate stoker 3 to be turned left reversing by the right side; Described burner hearth 1 is provided with front wall 1a and rear wall 1b, and described front wall 1a root is provided with less front chimney arch 7; Economizer 10 and air preheater 11 is furnished with from top to bottom in described back-end ductwork 5; The area of space that described traveling-grate stoker 3 wraps up is furnished with a multiple air compartment 6, a multiple air compartment 6 arranges and communicate with described traveling-grate stoker 3 along the direct of travel (turning left from the right side) of traveling-grate stoker 3 in " one " word, in order to supply the First air 14 needed for coal combustion; Multiple front wall overfire air port 8a and multiple rear wall overfire air port 8b is furnished with respectively, for passing into Secondary Air at the lower area of described front wall 1a and described rear wall 1b; Multiple front wall fire air nozzle 9a and multiple rear wall fire air nozzle 9b is furnished with respectively in the upper zone of described front wall 1a and described rear wall 1b, described multiple front wall fire air nozzle 9a and multiple rear wall fire air nozzle 9b is arranged symmetrically with, for passing into burnout degree along the center line of described burner hearth 1; Described chain furnace also extracts recirculation stove cigarette 13 in described back-end ductwork 5 position between described economizer 10 and described air preheater 11, and described recirculation stove cigarette 13 sends into an air compartment 6 described in several via recirculation blower 12.Described front wall overfire air port 8a and rear wall overfire air port 8b to have a down dip ° angle, 25 ~ 40 ° of angle and-15 ~ 20 (angle negative value represents that rear wall Secondary Air is faced upward and sprays into) relative to horizontal direction respectively, and described front wall fire air nozzle 9a and rear wall fire air nozzle 9b to have a down dip 20 ~ 40 ° of angles relative to horizontal direction.Other composition and annexation identical with embodiment one.
The utility model is applicable to various middle-size and small-size industrial coal chain-grate boiler.The foregoing is only better case study on implementation of the present utility model, all equalizations done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (9)
1. a coupling fractional combustion and the low NO of flue gas recirculation
xchain furnace, is made up of burner hearth (1), feeder (2), traveling-grate stoker (3), slag bucket (4) and back-end ductwork (5); It is characterized in that: described burner hearth (1) is divided into upper and lower two parts by front chimney arch (7a) and rear chimney arch (7b); Economizer (10) and air preheater (11) is furnished with from top to bottom in described back-end ductwork (5); The area of space that described traveling-grate stoker (3) wraps up is furnished with a multiple air compartment (6), a multiple air compartment (6) arranges along the direct of travel of traveling-grate stoker (3) in " one " word, and the outlet of a described multiple air compartment air compartment (6) communicates with described traveling-grate stoker (3); Described chain furnace also extracts recirculation stove cigarette (13) in described back-end ductwork (5) position between described economizer (10) and described air preheater (11), and described recirculation stove cigarette (13) sends into an air compartment (6) described in several via recirculation blower (12).
2. coupling fractional combustion as claimed in claim 1 and the low NO of flue gas recirculation
xchain furnace, it is characterized in that: the region, middle and lower part of described front chimney arch (7a) and described rear chimney arch (7b) is furnished with multiple front wall overfire air port (8a) and multiple rear wall overfire air port (8b) respectively, for passing into Secondary Air, described multiple front wall overfire air port (8a) and multiple rear wall overfire air port (8b) all arrange along stove cross direction in " one " word and are communicated with described burner hearth (1) bottom, and the position of the more described rear wall overfire air port (8b) in the position of described front wall overfire air port (8a) is high.
3. coupling fractional combustion as claimed in claim 2 and the low NO of flue gas recirculation
xchain furnace, it is characterized in that: described chain furnace is also furnished with multiple front wall fire air nozzle (9a) and multiple rear wall fire air nozzle (9b) in upper and lower burner hearth intersection, described multiple front wall fire air nozzle (9a) and multiple rear wall fire air nozzle (9b) all arrange along stove cross direction in " one " word and are communicated with described burner hearth (1) bottom, and the position of the more described rear wall fire air nozzle (9b) in the position of described front wall fire air nozzle (9a) is high.
4. coupling fractional combustion as claimed in claim 3 and the low NO of flue gas recirculation
xchain furnace, is characterized in that: described front wall overfire air port (8a) and described rear wall overfire air port (8b) are at stove cross direction one_to_one corresponding, and described front wall fire air nozzle (9a) and described rear wall fire air nozzle (9b) are at stove cross direction one_to_one corresponding; And described front wall overfire air port (8a) is upper in one-to-one relationship described front chimney arch (7a) with described front wall fire air nozzle (9a), described rear wall overfire air port (8b) and described rear wall fire air nozzle (9b) in the rear chimney arch (7b) are upper in one-to-one relationship.
5. coupling fractional combustion as claimed in claim 3 and the low NO of flue gas recirculation
xchain furnace, it is characterized in that: described front wall overfire air port (8a) and rear wall overfire air port (8b) to have a down dip 25 ~ 40 ° of angles and 10 ~ 25 ° of angles relative to horizontal direction respectively, described front wall fire air nozzle (9a) and rear wall fire air nozzle (9b) to have a down dip 25 ~ 40 ° of angles and 0 ~ 15 ° of angle relative to horizontal direction respectively.
6. coupling fractional combustion as claimed in claim 3 and the low NO of flue gas recirculation
xchain furnace, is characterized in that: enter the First air (14) of a described multiple air compartment (6), enter the Secondary Air of described front wall overfire air port (8a) and described rear wall overfire air port (8b), enter the burnout degree of described front wall fire air nozzle (9a) and described rear wall fire air nozzle (9b) and enter the recirculation stove cigarette (13) of a multiple air compartment (6) all adjustable.
7. coupling fractional combustion as claimed in claim 1 and the low NO of flue gas recirculation
xchain furnace, is characterized in that: described feeder (2) adopts coal supply spreader feeder (15).
8. coupling fractional combustion as claimed in claim 7 and the low NO of flue gas recirculation
xchain furnace, is characterized in that: described burner hearth (1) is provided with front wall (1a) and rear wall (1b), and described front wall (1a) root is provided with less front chimney arch (7); Multiple front wall overfire air port (8a) and multiple rear wall overfire air port (8b) is furnished with respectively at the lower area of described front wall (1a) and described rear wall (1b); Be furnished with multiple front wall fire air nozzle (9a) and multiple rear wall fire air nozzle (9b) respectively in the upper zone of described front wall (1a) and described rear wall (1b), described multiple front wall fire air nozzle (9a) and multiple rear wall fire air nozzle (9b) are arranged symmetrically with along the center line of described burner hearth (1).
9. coupling fractional combustion as claimed in claim 8 and the low NO of flue gas recirculation
xchain furnace, it is characterized in that: described front wall overfire air port (8a) and rear wall overfire air port (8b) to have a down dip ° angle, 25 ~ 40 ° of angle and-15 ~ 20 relative to horizontal direction respectively, described front wall fire air nozzle (9a) and rear wall fire air nozzle (9b) to have a down dip 20 ~ 40 ° of angles relative to horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520142942.3U CN204574001U (en) | 2015-03-13 | 2015-03-13 | A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520142942.3U CN204574001U (en) | 2015-03-13 | 2015-03-13 | A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204574001U true CN204574001U (en) | 2015-08-19 |
Family
ID=53866629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520142942.3U Withdrawn - After Issue CN204574001U (en) | 2015-03-13 | 2015-03-13 | A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204574001U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748104A (en) * | 2015-03-13 | 2015-07-01 | 江苏盛凯环保工程有限公司 | Coupling staged combustion and smoke recirculation low NOx chain grate furnace |
| CN107013937A (en) * | 2017-05-16 | 2017-08-04 | 中国特种设备检测研究院 | A kind of multilayer subzone coordinated with primary combustion air, classification coal burning layered boiler low nitrogen burning control technology |
| 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 |
| RU2738537C1 (en) * | 2020-07-24 | 2020-12-14 | Федеральное государственное автономное образовательное учреждение высшего образования «Северный (Арктический) федеральный университет имени М. В. Ломоносова» | Furnace with inclined-pushing grate for burning wood wastes |
| RU2750588C1 (en) * | 2020-12-11 | 2021-06-29 | Федеральное государственное автономное образовательное учреждение высшего образования «Северный (Арктический) федеральный университет имени М. В. Ломоносова» | Furnace with inclined pushing grille for biofuel combustion |
| RU2773999C1 (en) * | 2021-11-19 | 2022-06-14 | Федеральное государственное автономное образовательное учреждение высшего образования "Северный (Арктический) федеральный университет имени М. В. Ломоносова" | Furnace with an inclined-pushing grate for combustion of granulated and briquetted fuels |
-
2015
- 2015-03-13 CN CN201520142942.3U patent/CN204574001U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104748104A (en) * | 2015-03-13 | 2015-07-01 | 江苏盛凯环保工程有限公司 | Coupling staged combustion and smoke recirculation low NOx chain grate furnace |
| CN107013937A (en) * | 2017-05-16 | 2017-08-04 | 中国特种设备检测研究院 | A kind of multilayer subzone coordinated with primary combustion air, classification coal burning layered boiler low nitrogen burning control technology |
| 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 |
| RU2738537C1 (en) * | 2020-07-24 | 2020-12-14 | Федеральное государственное автономное образовательное учреждение высшего образования «Северный (Арктический) федеральный университет имени М. В. Ломоносова» | Furnace with inclined-pushing grate for burning wood wastes |
| RU2750588C1 (en) * | 2020-12-11 | 2021-06-29 | Федеральное государственное автономное образовательное учреждение высшего образования «Северный (Арктический) федеральный университет имени М. В. Ломоносова» | Furnace with inclined pushing grille for biofuel combustion |
| RU2773999C1 (en) * | 2021-11-19 | 2022-06-14 | Федеральное государственное автономное образовательное учреждение высшего образования "Северный (Арктический) федеральный университет имени М. В. Ломоносова" | Furnace with an inclined-pushing grate for combustion of granulated and briquetted fuels |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104748104B (en) | A kind of coupling fractional combustion and the low NOx chain furnace of flue gas recirculation | |
| CN104791772B (en) | Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function | |
| CN204574001U (en) | A kind of low NOx chain furnace of be coupled fractional combustion and flue gas recirculation | |
| CN100491821C (en) | Dense-phase back-flushing multiple level NOx combustion method | |
| CN102537975A (en) | Circulating fluidized bed garbage incineration boiler and pollution control system with same | |
| CN107559821B (en) | The multiple-pass industrial coal powder boiler of flue gas recirculation and vortex burner overhead | |
| CN202884901U (en) | Boiler capable of realizing reignition of exhaust gas coal powder by using high-temperature flue gas and reducing NOx | |
| CN105864748A (en) | Combined combustion system of chain boiler | |
| CN108895430A (en) | A kind of efficient low NO of coupled rotational flow coal dust firing and enhanced flue gas recirculationxChain furnace | |
| CN100504164C (en) | Coal firing method with low emission for nitrous oxides | |
| CN205842635U (en) | A kind of combustion system reducing Opposite Firing Boiler nitrogen oxides | |
| CN103697465A (en) | Boiler capable of achieving reignition of exhaust gas coal powder and reducing NOx by using high-temperature flue gas | |
| CN206257656U (en) | Chain furnace system | |
| CN205807453U (en) | A kind of spreader stoker chain boiler using flue gas recirculation to reduce NOx emission | |
| CN104792007B (en) | It is a kind of to couple side wall classification wind and the horizontal chain grate hot Media Oven of flue gas recirculation | |
| CN104406160A (en) | Low-NOx four-arch type W flame boiler for coupling air staging and fuel staging | |
| CN104154532A (en) | Center air ring concentrated type turbulent burner | |
| CN101569829B (en) | Method for jointly controlling emission of NOx by utilizing multi-stage bias combustion and fuel reburning | |
| CN107355809A (en) | Reduce W type flame boilers NOxThe method of discharge | |
| CN108826280B (en) | Circulating fluidized bed boiler burning Indonesian coal | |
| CN205002381U (en) | Hierarchical wind of coupling side wall and gas recirculation's horizontal traveling grate stoker heat medium stove | |
| CN203549793U (en) | Combined type chain grate furnace with pulverized coal burner | |
| CN106439792B (en) | Chain furnace system and mode chain furnace combustion method | |
| CN104990072A (en) | Efficient and low NOx emission fluidized bed boiler | |
| CN205299497U (en) | Hierarchical sorting combustion system of circulating fluidized bed fuel thickness |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150819 Effective date of abandoning: 20171114 |