CN103604119A - Circulating fluidized bed overgrate air distribution method and special-purpose boiler - Google Patents
Circulating fluidized bed overgrate air distribution method and special-purpose boiler Download PDFInfo
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- CN103604119A CN103604119A CN201310624513.5A CN201310624513A CN103604119A CN 103604119 A CN103604119 A CN 103604119A CN 201310624513 A CN201310624513 A CN 201310624513A CN 103604119 A CN103604119 A CN 103604119A
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- secondary air
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- burner hearth
- fluidized bed
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Abstract
The invention relates to a circulating fluidized bed overgrate air distribution method and a special-purpose boiler and especially relates to a fire coal slurry circulating fluidized bed overgrate air distribution method and a special-purpose boiler. The invention aims at providing the circulating fluidized bed overgrate air distribution method capable of improving coal slurry combustion efficiency and the special-purpose boiler. The circulating fluidized bed overgrate air distribution method is characterized in that overgrate air is fed into a boiler from overgrate air inlets at two opposite sides of the boiler by two overgrate air pipe; and through adjustment on positions of the overgrate air inlets, the overgrate air from the two opposite sides of the boiler is alternately fed into the boiler and the overgrate air is inclinedly conveyed downwards along a horizontal direction. The special-purpose boiler comprises a hearth (1). The at least two overgrate air inlets (4) are respectively arranged at the two opposite sides from top to bottom. Each one of the overgrate air inlets comprises an air inlet and an air outlet. The air outlet inclines downwards and forms an included angle of 15-30 degrees with a horizontal direction. The overgrate air inlets at the two opposite sides are arranged staggeredly along a vertical direction.
Description
Technical field
The present invention relates to coal-fired mud recirculating fluidized bed field, particularly relate to a kind of coal-fired mud recirculating fluidized bed Secondary Air air distribution method and boiler dedicated.
Background technology
Coal slime adopts the feed-type of CFBC to have four kinds: furnace roof feed, burner hearth middle part feed, material returning valve feed and emulsion zone atomization feed.Wherein the scheme Shi You Zhejiang University of coal slime furnace roof feed burning proposes, its main theory of combustion is: the coal-water mixture being comprised of fine grained is sent in high-temperature burner hearth through boiler top by the condensed state with larger volume, rapid conglomerate under the condition of high temperature, if can stop time enough in burner hearth, can there is thermal explosion in the gasification of agglomerates internal moisture, form less coal slime group, and then cohesion, thermal explosion again, when coal slime drops down onto recirculating fluidized bed bottom, the thermal explosion of agglomerates all disappears, and unburned completely coal slime particle burns on fluid bed.From the theory of combustion, in burner hearth, the suspension of coal slime and the oxygen-supplying amount at the time of staying and hearth combustion center are the keys that determines coal slime efficient burning.
As shown in Figure 1, the burning sludge with circulating fluidized-bed boiler that employing belongs to prior art exists coal slime too short at burner hearth 1 ' inner suspension and the time of staying, burner hearth 1 ' central burner region anoxic is serious, combustion zone is apart from burner hearth 1 ' top exhanst gas outlet 3 ' near, make coal slime chip imperfect combustion in thermal explosion process be easy to enter along with flue gas the problems such as separator or back-end ductwork, finally cause coal combustion insufficient, fly ash combustible material is high.From secondary air channel 2 out of secondary air chamber ' be connected with the burner hearth 1 ' lower end of boiler, carry out the conveying of Secondary Air.Although can adopt, increase burner hearth 1 ' highly improve coal slime in burner hearth 1 ' interior suspension and time of staying, strengthen Secondary Air wind supply quantity and improve combustion zone anoxic, adopt efficient cyclone to reduce the measures such as fuel elutriation loss, but these methods are all subject to complex structure, the factors such as manufacture is high with operating cost, and operational reliability is poor restriction.
Summary of the invention
The technical problem to be solved in the present invention is to provide and a kind ofly can makes coal combustion recirculating fluidized bed Secondary Air air distribution method and boiler dedicated more fully.
Recirculating fluidized bed Secondary Air air distribution method in the present invention, comprises the following steps:
A, unlatching secondary air chamber or secondary air box, used two secondary air channels to be connected with secondary air chamber or secondary air box, and Secondary Air is carried along two secondary air channels;
Secondary Air in B, two secondary air channels is transported in burner hearth from relative two sidewalls of boiler respectively, at least two the Secondary Air entrances vertically arranged of the Secondary Air of each side-walls from this sidewall are transported in burner hearth, and the secondary blast that makes both sides is staggered air-supply;
C, the Secondary Air of each Secondary Air entrance of boiler both sides is tilted to be down delivered in burner hearth, adjusting the downward-sloping angle of Secondary Air along continuous straight runs is 15～30 degree.
Recirculating fluidized bed Secondary Air air distribution method in the present invention, in wherein said step B, while adjusting the position of boiler two side secondary air entrances, the Secondary Air entrance of a side is wherein arranged on to the below of boiler flue gas outlet, and makes the Secondary Air entrance that is positioned at the top near exhanst gas outlet setting.
Boiler dedicated in the present invention, comprise burner hearth, the roof of described burner hearth is connected with coal slime pipeline, the upper end of sidewall is provided with exhanst gas outlet, on relative two sidewalls of described burner hearth, be respectively equipped with at least two Secondary Air entrances from top to bottom, described Secondary Air entrance comprises air intake and outlet air end, the downward-sloping layout of described outlet air end and with the angle of horizontal direction be 15～30 degree, Secondary Air entrance in the vertical direction interlaced arrangement on described two sidewalls, the air intake of all Secondary Air entrances on each sidewall is connected with a secondary air channel respectively, the other end of every secondary air channel is all connected with secondary air chamber or secondary air box.
Boiler dedicated in the present invention, the Secondary Air entrance on one of them sidewall of wherein said burner hearth is arranged on exhanst gas outlet below, is positioned at the Secondary Air entrance of this sidewall the top near exhanst gas outlet setting.
Recirculating fluidized bed Secondary Air air distribution method of the present invention and boiler dedicated difference from prior art are in the present invention by be respectively provided to few two Secondary Air entrances from top to bottom on relative two sidewalls of burner hearth, the downward-sloping layout of outlet air end of Secondary Air entrance and be set to 15～30 degree with the angle of horizontal direction, in the vertical direction, Secondary Air entrance on two sidewalls is set to interlaced arrangement, passs the multistage air distribution network of the formula of connecing like this with regard to having formed a complete Secondary Air.Secondary Air enters burner hearth from the Secondary Air entrance topmost that is positioned at of a sidewall of burner hearth, it can disturb the straight line descent path of coal slime, coal slime can move to another sidewall, now another sidewall Secondary Air entrance topmost also blows out Secondary Air, coal slime can be made fold return motion again like this, and so forth circulation.This Secondary Air is passed the multistage air distribution network of the formula of connecing and has just been extended the descending stroke of coal slime like this, and the coal slurry fuel declining gradually in burner hearth is carried out to multistage progressively aftercombustion wind, i.e. the postcombustion needed oxygen that burns.So just can make the coal combustion entering in burner hearth obtain more abundant.
Recirculating fluidized bed Secondary Air air distribution method of the present invention and the boiler dedicated middle below that Secondary Air entrance on a sidewall of burner hearth is arranged on to boiler flue gas outlet, and make the Secondary Air entrance that is positioned at the top near exhanst gas outlet setting, when the Secondary Air entrance of the top blows out Secondary Air, it can stop that too much coal slime chip flies away from smoke outlet like this.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structure chart of CFBB of the prior art;
Fig. 2 is structure chart boiler dedicated in the present invention;
Fig. 3 is for being used the boiler dedicated recirculating fluidized bed combustion system figure in the present invention.
The specific embodiment
As shown in Figure 2, the boiler dedicated burner hearth 1 that comprises in the present invention, the roof of described burner hearth 1 is connected with coal slime pipeline 2, the upper end of sidewall is provided with exhanst gas outlet 3, on relative two sidewalls of described burner hearth 1, be respectively equipped with 4 Secondary Air entrances 4 from top to bottom, described Secondary Air entrance 4 comprises air intake and outlet air end, the downward-sloping layout of described outlet air end and with the angle of horizontal direction be 15～30 degree, Secondary Air entrance 4 in the vertical direction interlaced arrangement on described two sidewalls, the air intake of all Secondary Air entrances 4 on each sidewall is connected with a secondary air channel 5 respectively, the other end of every secondary air channel 5 is all connected with secondary air chamber or secondary air box.
Boiler dedicated in the present invention, the Secondary Air entrance 4 on one of them sidewall of wherein said burner hearth is arranged on exhanst gas outlet 3 belows, and the Secondary Air entrance 4 that is positioned at this sidewall the top arranges near exhanst gas outlet 3.
As shown in Figure 3, the recirculating fluidized bed Secondary Air air distribution method in the present invention, comprises the following steps:
A, unlatching secondary air chamber or secondary air box, used two secondary air channels 5 to be connected with secondary air chamber or secondary air box, and Secondary Air is carried along two secondary air channels 5;
Secondary Air in B, two secondary air channels 5 is transported in burner hearth 1 from relative two sidewalls of boiler respectively, at least two the Secondary Air entrances 4 vertically arranged of the Secondary Air of each side-walls from this sidewall are transported in burner hearth 1, the secondary blast of adjusting the ，Shi both sides, position of boiler two side secondary air entrances 4 is staggered air-supply;
C, adjust wind direction, the Secondary Air of each Secondary Air entrance 4 of boiler both sides is tilted to down and is delivered in burner hearth 1, adjusting the downward-sloping angle of Secondary Air along continuous straight runs is 15～30 degree.
Recirculating fluidized bed Secondary Air air distribution method in the present invention, in wherein said step B, while adjusting the position of boiler two side secondary air entrances 4, the Secondary Air entrance 4 of a side is wherein arranged on to the below of boiler flue gas outlet 3, and the Secondary Air entrance 4 that is positioned at the top is arranged near exhanst gas outlet 3.
In the present invention, the size of the laying angle of Secondary Air entrance 4 has determined cross section penetration power and the stroke of coal slime in burner hearth 1 of Secondary Air.Secondary Air entrance 4 is less with horizontal plane angulation, and the cross section penetration power of Secondary Air is stronger, makes the stroke of coal slime in burner hearth 1 longer; Otherwise Secondary Air entrance 4 is larger with horizontal plane angulation, the cross section penetration power of Secondary Air is more weak, and the stroke of coal slime in burner hearth 1 is shorter.But Secondary Air entrance 4 neither be the smaller the better with horizontal plane angulation, because angle is too little, the cross-sectional strength of Secondary Air increases, and has increased contacting and the probability of collision of coal slime chip and burner hearth 1 wall, can strengthen the wearing and tearing to burner hearth 1 wall.In addition, also easily make coal slime chip along with flue gas leaves burner hearth 1 from exhanst gas outlet 3, make the loss of fuel elutriation become large.The general Secondary Air entrance 4 of selecting becomes the angle of 15～30 ° to be advisable with horizontal plane.
Wherein, the quantity of Secondary Air entrance 4, the number of plies and wind speed can be adjusted in conjunction with actual conditions.The secondary air channel 5 of installing is unified access secondary air chamber or joins with independent outfit secondary air box.This characteristic feature of an invention is greatly to improve suspension and the time of staying of coal slime in burner hearth 1, improves burner hearth 1 combustion centre's anaerobic condition, prevents too much fuel elutriation loss, and simple in structure, manufactures easy for installation.
The invention has the advantages that: the one, when boiler is worked, coal slime falls into burner hearth along the coal slime pipeline of furnace roof, meet high temperature cohesion conglomeration, and fall rapidly, be subject to the impact of furnace wall two side secondary airs, the descent path of agglomerates is broken line type, and this has just extended the stroke of agglomerates in burner hearth, has guaranteed the abundant thermal explosion of agglomerates and the time of burning.Two are provided in a side of near first order Secondary Airs exhanst gas outlet can produce interference effect to the suspension coal slime chip producing after agglomerates thermal explosion and burning, and this has just reduced the probability that coal slime chip enters exhanst gas outlet, has reduced the elutriation loss of fuel combustible.The 3rd, the multistage air feed in the fractional combustion process of coal slime whereabouts, has strengthened the flow-disturbing effect in stove, has improved hearth combustion central area oxygen concentration field and has distributed, and improves the efficiency of combustion of boiler.The 4th, the multistage air feed of Secondary Air can to control the air quantity of different combustion zones, make it in reproducibility state as far as possible along with the carrying out postcombustion wind progressively of burning, and this reduction for NOx discharge is very beneficial.The 5th, this Secondary Air blowing system is simple in structure, manufactures easy for installation.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (4)
1. a recirculating fluidized bed Secondary Air air distribution method, is characterized in that: comprise the following steps:
A, unlatching secondary air chamber or secondary air box, used two secondary air channels (5) to be connected with secondary air chamber or secondary air box, and Secondary Air is carried along two secondary air channels (5);
Secondary Air in B, two secondary air channels (5) is transported in burner hearth (1) from relative two sidewalls of boiler respectively, at least two the Secondary Air entrances (4) vertically arranged of the Secondary Air of each side-walls from this sidewall are transported in burner hearth (1), and the secondary blast that makes both sides is staggered air-supply;
C, the Secondary Air of each Secondary Air entrance (4) of boiler both sides is tilted to be down delivered in burner hearth (1), adjusting the downward-sloping angle of Secondary Air along continuous straight runs is 15～30 degree.
2. recirculating fluidized bed Secondary Air air distribution method according to claim 1, it is characterized in that: in described step B, while adjusting the position of boiler two side secondary air entrances (4), the Secondary Air entrance (4) of a side is wherein arranged on to the below of boiler flue gas outlet (3), and the Secondary Air entrance (4) that is positioned at the top is arranged near exhanst gas outlet (3).
3. implement the claims the boiler dedicated of recirculating fluidized bed Secondary Air air distribution method described in 1 or 2, comprise burner hearth (1), the roof of described burner hearth (1) is connected with coal slime pipeline (2), the upper end of sidewall is provided with exhanst gas outlet (3), it is characterized in that: on relative two sidewalls of described burner hearth (1), be respectively equipped with at least two Secondary Air entrances (4) from top to bottom, described Secondary Air entrance (4) comprises air intake and outlet air end, the downward-sloping layout of described outlet air end and with the angle of horizontal direction be 15～30 degree, Secondary Air entrance (4) in the vertical direction interlaced arrangement on described two sidewalls, the air intake of all Secondary Air entrances (4) on each sidewall is connected with a secondary air channel (5) respectively, the other end of every secondary air channel (5) is all connected with secondary air chamber or secondary air box.
4. according to claim 3 boiler dedicated, it is characterized in that: the Secondary Air entrance (4) on one of them sidewall of described burner hearth (1) is arranged on exhanst gas outlet (3) below, the Secondary Air entrance (4) that is positioned at this sidewall the top arranges near exhanst gas outlet (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624513.5A CN103604119B (en) | 2013-11-28 | 2013-11-28 | Circulating fluidized bed secondary air joins wind method and boiler dedicated |
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| CN201310624513.5A CN103604119B (en) | 2013-11-28 | 2013-11-28 | Circulating fluidized bed secondary air joins wind method and boiler dedicated |
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| CN103604119A true CN103604119A (en) | 2014-02-26 |
| CN103604119B CN103604119B (en) | 2016-06-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654285A (en) * | 2014-12-20 | 2015-05-27 | 灵璧县长城锅炉制造厂 | Biomass combustion boiler |
| CN110107911A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of novel secondary wind system and its working method for face-fired boiler |
| CN110486748A (en) * | 2019-09-17 | 2019-11-22 | 广西联源机械化工有限公司 | A kind of secondary air feed system of bagasse boiler |
| CN111023090A (en) * | 2019-12-26 | 2020-04-17 | 常州大学 | Double-cyclone ultralow nitrogen gas burner with adjustable secondary air |
| CN112050195A (en) * | 2020-09-28 | 2020-12-08 | 黑龙江省农业机械工程科学研究院 | Biomass briquette stove based on high-efficiency graded layer combustion technology |
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| CN1058463A (en) * | 1991-07-02 | 1992-02-05 | 浙江大学 | High concentration, high viscosity coal washing mud are carried the feed method and system |
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| CN202018035U (en) * | 2011-03-18 | 2011-10-26 | 中国电力企业联合会科技开发服务中心 | Fluidized bed boiler provided with plug-type air pipes |
| CN203147751U (en) * | 2013-02-22 | 2013-08-21 | 杭州锅炉集团股份有限公司 | Furnace air distribution device for biomass circulating fluidized bed boiler |
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2013
- 2013-11-28 CN CN201310624513.5A patent/CN103604119B/en not_active Expired - Fee Related
Patent Citations (5)
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| CN1058463A (en) * | 1991-07-02 | 1992-02-05 | 浙江大学 | High concentration, high viscosity coal washing mud are carried the feed method and system |
| JPH07243630A (en) * | 1994-03-08 | 1995-09-19 | Babcock Hitachi Kk | Fluidized bed type incinerator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104654285A (en) * | 2014-12-20 | 2015-05-27 | 灵璧县长城锅炉制造厂 | Biomass combustion boiler |
| CN110107911A (en) * | 2019-04-30 | 2019-08-09 | 华电电力科学研究院有限公司 | A kind of novel secondary wind system and its working method for face-fired boiler |
| CN110107911B (en) * | 2019-04-30 | 2023-09-08 | 华电电力科学研究院有限公司 | Secondary air system for opposed firing boiler and working method thereof |
| CN110486748A (en) * | 2019-09-17 | 2019-11-22 | 广西联源机械化工有限公司 | A kind of secondary air feed system of bagasse boiler |
| CN110486748B (en) * | 2019-09-17 | 2024-03-08 | 广西联源机械化工有限公司 | Secondary air supply system of bagasse boiler |
| CN111023090A (en) * | 2019-12-26 | 2020-04-17 | 常州大学 | Double-cyclone ultralow nitrogen gas burner with adjustable secondary air |
| CN112050195A (en) * | 2020-09-28 | 2020-12-08 | 黑龙江省农业机械工程科学研究院 | Biomass briquette stove based on high-efficiency graded layer combustion technology |
| CN112050195B (en) * | 2020-09-28 | 2021-05-18 | 黑龙江省农业机械工程科学研究院 | Biomass briquette stove based on high-efficiency graded layer combustion technology |
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| CN103604119B (en) | 2016-06-08 |
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Granted publication date: 20160608 Termination date: 20181128 |