CN103604119B - Circulating fluidized bed secondary air joins wind method and boiler dedicated - Google Patents
Circulating fluidized bed secondary air joins wind method and boiler dedicated Download PDFInfo
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- CN103604119B CN103604119B CN201310624513.5A CN201310624513A CN103604119B CN 103604119 B CN103604119 B CN 103604119B CN 201310624513 A CN201310624513 A CN 201310624513A CN 103604119 B CN103604119 B CN 103604119B
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- secondary air
- boiler
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- burner hearth
- fluidized bed
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Abstract
Circulating fluidized bed secondary air of the present invention is joined wind method and boiler dedicated related to a kind of coal-fired mud circulating fluidized bed secondary air and join wind method and boiler dedicated. Its objective is in order to provide one can make coal combustion more fully circulating fluidized bed secondary air join wind method and boiler dedicated. It is exactly respectively from the secondary air entrance feeding secondary wind the relative both sides of boiler by two secondary air channels that circulating fluidized bed secondary air in the present invention joins wind method, make the secondary air of both sides for staggered air-supply by adjusting the position of secondary air entrance, and make secondary air tilt conveying in the horizontal direction downwards. Boiler dedicated in the present invention comprises burner hearth (1), its relative two sidewalls are respectively equipped with at least two secondary air entrances (4) from top to bottom, secondary air entrance comprises outlet and inlet end, outlet air end tilts downwards and angle with horizontal direction is 15��30 degree, the secondary air entrance in the vertical direction staggered arrangement on two sidewalls.
Description
Technical field
The present invention relates to coal-fired mud circulating fluidized bed field, particularly relate to a kind of coal-fired mud circulating fluidized bed secondary air and join wind method and boiler dedicated.
Background technology
Coal slime adopts the feed-type of circulating fluidized bed combustion to have four kinds: furnace roof is atomized to material to material and emulsion zone to material, material returning valve in the middle part of material, burner hearth. Wherein coal slime furnace roof is proposed to the scheme of material burning by Zhejiang University, its primary combustion principle is: the coal-water mixture being made up of fine particle is sent in high-temperature burner hearth with the condensed state of comparatively large vol through boiler top, rapid conglomerate at high operating temperatures, if can stop in burner hearth the enough time, agglomerates internal moisture gasification can occur heat quick-fried, form less coal slime group, and then condense, reheating is quick-fried, when coal slime drops down onto bottom circulating fluidized bed, hot quick-fried whole disappearance of agglomerates, unburn is the then burning on fluidized-bed of coal slime particle completely. From combustion principle, in burner hearth, suspending of coal slime is the key determining coal slime efficient burning with the oxygen-supplying amount of the residence time and hearth combustion center.
As shown in Figure 1, the burning sludge with circulating fluidized-bed boiler belonging to prior art is adopted to there is coal slime too short at burner hearth 1 ' inner suspension and the residence time, burner hearth 1 ' central burner region anoxic is serious, distance burner hearth 1 ' top, combustion zone exhanst gas outlet 3 ' is near, coal slime chip imperfect combustion in hot quick-fried process is made to be easy to along with flue gas enters the problem such as separator or back-end ductwork, finally cause coal combustion insufficient, fly ash combustible material height. It is connected with the lower end of burner hearth 1 ' of boiler from secondary air chamber secondary air channel 2 ' out, carries out the conveying of secondary air. Although can adopt increases burner hearth 1 ' and highly improves coal slime in the interior suspension of burner hearth 1 ' and the residence time, strengthen secondary air wind supply quantity and improve combustion zone anoxic, adopt efficient cyclone to reduce fuel and raise the measures such as analysis loss, but these methods are all by complex structure, manufacture and running cost height, the factor restrictions such as serviceability difference.
Summary of the invention
The technical problem to be solved in the present invention be to provide one can make coal combustion more fully circulating fluidized bed secondary air join wind method and boiler dedicated.
Circulating fluidized bed secondary air in the present invention joins wind method, comprises the following steps:
A, unlatching secondary air chamber or secondary air box, it may also be useful to two secondary air channels are 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 respectively from relative two sidewalls of boiler, the secondary air entrance that the secondary air of each side-walls vertically arranges from least two this sidewall is transported in burner hearth, makes the secondary blast of both sides for staggered air-supply;
C, the secondary air of each secondary air entrance of boiler both sides being tilted to down be delivered in burner hearth, the angle that adjustment secondary air tilts downwards in the horizontal direction is 15��30 degree.
Circulating fluidized bed secondary air in the present invention joins wind method, in wherein said step B, when adjusting the position of boiler two side secondary air entrance, the secondary air entrance of wherein side is arranged on the lower section of boiler flue gas outlet, and the secondary air entrance being positioned at the top is arranged near exhanst gas outlet.
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, relative two sidewalls of described burner hearth are respectively equipped with at least two secondary air entrances from top to bottom, described secondary air entrance comprises air intake and outlet air end, described outlet air end is in tilted layout downwards and angle with horizontal direction is 15��30 degree, secondary air entrance in the vertical direction staggered 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 root 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 below exhanst gas outlet, and the secondary air entrance being positioned at this sidewall the top is arranged near exhanst gas outlet.
Circulating fluidized bed secondary air of the present invention joins wind method and boiler dedicated difference from prior art is in the present invention by being respectively provided to few two secondary air entrances on relative two sidewalls of burner hearth from top to bottom, the outlet air end of secondary air entrance is in tilted layout downwards and angle with horizontal direction is set to 15��30 degree, in the vertical direction, secondary air entrance on two sidewalls is set to staggered arrangement, material is thus formed a complete secondary air and pass that the formula of connecing is multistage joins wind network. Secondary air enters burner hearth from the secondary air entrance topmost that is positioned at of burner hearth sidewall, it can disturb the straight line decline path of coal slime, coal slime can move to another sidewall, now the secondary air entrance of another sidewall the top also blows out secondary air, such coal slime can make again fold return motion, circulates and so forth. This secondary air passs that the formula of connecing is multistage joins the descending stroke that wind network just extends coal slime like this, and the coal slurry fuel declined gradually in burner hearth carries out multistage progressively aftercombustion wind, namely supplements the oxygen required for fuel combustion. So just the coal combustion entering in burner hearth can be made to obtain more abundant.
Circulating fluidized bed secondary air of the present invention joins wind method and the boiler dedicated middle lower section that secondary air entrance on burner hearth sidewall is arranged on boiler flue gas outlet, and the secondary air entrance being positioned at the top is arranged near exhanst gas outlet, like this when the secondary air entrance blowout secondary air of the top, it can stop that too much coal slime chip flies away from smoke outlet.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structure iron of circular fluid bed of the prior art;
Fig. 2 is structure iron boiler dedicated in the present invention;
Fig. 3 uses the boiler dedicated recirculating fluidized bed combustion system figure in the present invention.
Embodiment
As shown in Figure 2, boiler dedicated in the present invention comprises 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, relative two sidewalls of described burner hearth 1 are respectively equipped with 4 secondary air entrances 4 from top to bottom, described secondary air entrance 4 comprises air intake and outlet air end, described outlet air end is in tilted layout downwards and angle with horizontal direction is 15��30 degree, secondary air entrance 4 in the vertical direction staggered 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 root 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 below exhanst gas outlet 3, and the secondary air entrance 4 being positioned at this sidewall the top is arranged near exhanst gas outlet 3.
As shown in Figure 3, the circulating fluidized bed secondary air in the present invention joins wind method, comprises the following steps:
A, unlatching secondary air chamber or secondary air box, it may also be useful to two secondary air channels 5 are 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 respectively from relative two sidewalls of boiler, the secondary air of each side-walls is transported in burner hearth 1 from the secondary air entrance 4 that at least two this sidewall vertically arrange, the position of adjustment boiler two side secondary air entrance 4, makes the secondary blast of both sides for staggered air-supply;
C, adjustment wind direction, make the secondary air of each secondary air entrance 4 of boiler both sides be tilted to down and be delivered in burner hearth 1, and the angle that adjustment secondary air tilts downwards in the horizontal direction is 15��30 degree.
Circulating fluidized bed secondary air in the present invention joins wind method, in wherein said step B, when adjusting the position of boiler two side secondary air entrance 4, the secondary air entrance 4 of wherein side is arranged on the lower section of boiler flue gas outlet 3, and the secondary air entrance 4 being positioned at the top is arranged near exhanst gas outlet 3.
In the present invention, the size of the ply stacking angle of secondary air entrance 4 determines the cross section penetration power of secondary air and the coal slime stroke in burner hearth 1. Secondary air entrance 4 is more little with horizontal plane angulation, and the cross section penetration power of secondary air is more strong, makes the stroke of coal slime in burner hearth 1 more long; Otherwise, secondary air entrance 4 is more big with horizontal plane angulation, and the cross section penetration power of secondary air is more weak, and the stroke of coal slime in burner hearth 1 is more short. But secondary air entrance 4 and horizontal plane angulation neither be the smaller the better, because angle is too little, the cross-sectional strength of secondary air increases, and adds the contact in coal slime chip and burner hearth 1 wall face and the probability of collision, can strengthen the abrasion to burner hearth 1 wall face. In addition, also easily make coal slime chip leave burner hearth 1 along with flue gas from exhanst gas outlet 3, make fuel raise analysis loss and become big. General selection secondary air entrance 4 is become 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 adjust in conjunction with practical situation. The secondary air channel 5 installed connects by unified access secondary air chamber or with outfit secondary air box separately.The feature of this invention can greatly improve the suspension of coal slime in burner hearth 1 and the residence time, improves burner hearth 1 combustion centre anoxic condition, prevents too much fuel from raising analysis loss, and structure is simple, and making and installation is convenient.
It is an advantage of the current invention that: one is when boiler works, coal slime falls into burner hearth along the coal slime pipeline of furnace roof, meet high temperature cohesion conglomeration, and fall rapidly, by the impact of furnace wall two side secondary air, the descent path of agglomerates is broken-line type, and this just extends the stroke of agglomerates in burner hearth, ensure that the abundant heat of the agglomerates quick-fried time with burning. Two be located at first step secondary air near exhanst gas outlet can to agglomerates heat quick-fried with burning after the suspension coal slime chip that produces produce interference effect, this reduces the probability that coal slime chip enters exhanst gas outlet, what reduce fuel ignition thing raises analysis loss. Three is the multistage confession wind in the fractional combustion process of coal slime whereabouts, enhances the flow-disturbing effect in stove, improves the oxygen concentration field distribution of hearth combustion central zone, it is to increase the efficiency of combustion of boiler. Four is that secondary air is multistage can progressively supplement fuel air along with the carrying out of burning for wind, to control the air quantity of different combustion zone, makes it to be in reductibility state as far as possible, and this is very beneficial for the reduction of NOx emission. Five is that this secondary air blowing system structure is simple, and making and installation is convenient.
Above-described embodiment is only the preferred embodiment of the present invention be described; not the scope of the present invention is limited; under the prerequisite not departing from inventive design spirit; the various distortion that the technical scheme of the present invention is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (2)
1. to join wind boiler dedicated for a circulating fluidized bed secondary air, 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), relative two sidewalls of described burner hearth (1) are respectively equipped with four secondary air entrances (4) from top to bottom, described secondary air entrance (4) comprises air intake and outlet air end, described outlet air end is in tilted layout downwards and angle with horizontal direction is 15��30 degree, secondary air entrance (4) in the vertical direction staggered 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 root secondary air channel (5) is all connected with secondary air chamber or secondary air box, secondary air entrance (4) on one of them sidewall of described burner hearth is arranged on exhanst gas outlet (3) lower section, the secondary air entrance (4) being positioned at this sidewall the top is arranged near exhanst gas outlet (3).
2. be applied in circulating fluidized bed secondary air according to claim 1 join wind boiler dedicated on circulating fluidized bed secondary air join wind method, comprise the following steps:
A, unlatching secondary air chamber or secondary air box, it may also be useful to two secondary air channels (5) are 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) respectively from relative two sidewalls of boiler, the secondary air of each side-walls is transported in burner hearth (1) from the secondary air entrance (4) that at least two this sidewall vertically arrange, the position of adjustment boiler two side secondary air entrance (4), makes the secondary blast of both sides for staggered air-supply;
C, adjustment wind direction, make the secondary air of each secondary air entrance (4) of boiler both sides be tilted to down and be delivered in burner hearth (1), and the angle that adjustment secondary air tilts downwards in the horizontal direction is 15��30 degree;
In wherein said step B, when adjusting the position of boiler two side secondary air entrance (4), the lower section that the secondary air entrance (4) of wherein side is arranged on boiler flue gas outlet (3), and the secondary air entrance (4) being positioned at the top is arranged near exhanst gas outlet (3).
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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 CN103604119A (en) | 2014-02-26 |
| CN103604119B true CN103604119B (en) | 2016-06-08 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104654285B (en) * | 2014-12-20 | 2017-06-27 | 灵璧县长城锅炉制造厂 | A kind of biomass combustion 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 |
| 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 |
| CN111023090B (en) * | 2019-12-26 | 2021-11-23 | 常州大学 | Double-cyclone ultralow nitrogen gas burner with adjustable secondary air |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102128447A (en) * | 2011-04-21 | 2011-07-20 | 张全胜 | Steam heating method of bed materials of fluidized bed boiler |
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN102128447A (en) * | 2011-04-21 | 2011-07-20 | 张全胜 | Steam heating method of bed materials of fluidized bed boiler |
| 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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