CN202350012U - Multi-angular tangential circle multi-scale coal dust decoupling combustion device - Google Patents

Multi-angular tangential circle multi-scale coal dust decoupling combustion device Download PDF

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Publication number
CN202350012U
CN202350012U CN2011204675277U CN201120467527U CN202350012U CN 202350012 U CN202350012 U CN 202350012U CN 2011204675277 U CN2011204675277 U CN 2011204675277U CN 201120467527 U CN201120467527 U CN 201120467527U CN 202350012 U CN202350012 U CN 202350012U
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China
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air port
wind snout
burner hearth
overfire air
coal dust
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CN2011204675277U
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郝江平
李静海
刘新华
葛蔚
何京东
刘雅宁
孙广藩
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Institute of Process Engineering of CAS
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Institute of Process Engineering of CAS
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Abstract

The utility model discloses a multi-angular tangential circle multi-scale coal dust decoupling combustion device. According to combustion characteristics of coal dust and the material conversion role, on micro scale, at least two or more nozzles in each column of primary air nozzles (3) on a multi-angular tangential circle combustion hearth are adjacently and intensively arranged in a high temperature region in the hearth close to the flame centre so as to realize multi-region front and back graded combustion in the radial direction; on the medium scale, two stages of secondary air nozzles (1) are arranged in a local concentration manner and are mixed with the primary air nozzles (3) to respectively form a strong reducibility region and a weak reducibility region or a weak oxidability region on the front and back sides so as to realize multi-region horizontal and left and right graded combustion; and on the macro scale, a peripheral over fire air nozzle (8) and a central over fire air nozzle (9) are arranged to respectively form a reducibility region and an oxidability region on the lower part and the upper part of the hearth so as to realize vertical, up and down air graded combustion.

Description

The multiple dimensioned coal dust decoupling combustion device of a kind of polygonal circle of contact
Technical field
The utility model relates to the coal-dust combustion device field, and particularly, the utility model relates to the multiple dimensioned coal dust decoupling combustion device of a kind of polygonal circle of contact.
Background technology
In the practical application of coal dust firing, along with coal air mixture in the ignition temperature of combustion phases and the raising of oxygen concentration, coal dust more is prone to fast, abundant after-flame, the content of fly ash combustible material in the flue gas (uncompleted burned carbon and CO) reduces; Simultaneously, high-temperature oxygen-enrichedly can make the NO that generates in the combustion process again xSignificantly improve; On the other hand, coal air mixture helps suppressing nitrogen oxide NO more in that the ignition temperature of combustion phases and oxygen concentration are low more xGenerate, but coal dust more is difficult for after-flame.Thereby, the fly ash combustible material and the NO of releasing coal dust firing xThe coupling emission problem be long-standing technological difficulties on the combustion technology.
At present, use the low NO of wider pulverized coal firing boiler xCombustion technology mainly is the air classification combustion technology.Because aforesaid coupling discharging relation, this technology often can only stress the solution of an aspect problem, not only can not deal with problems up hill and dale, also brings many other problems simultaneously.For example, macroscopical air classification combustion technology mainly adopts and NO xReactivity is lower and be distributed in the lower carbon monoxide of burner hearth concentration and reduce the NO that has generated x, suppress NO for improving xThe effect of discharging; Be forced through and increase the distance of after-flame wind (also claiming fiery windward) to main combustion zone; Improve the after-flame air quantity, strengthen reducing atmosphere and the zone that increases reducing atmosphere in the burner hearth, so just make the stage of oxygen-enriched combusting delay; The coke of extremely difficult after-flame and semicoke are postponed till from the nearer low-temperature burning district of furnace outlet and are removed after-flame; Cause the content of fly ash combustible material to increase, boiler efficiency descends, and in the burner hearth on a large scale reducing atmosphere also make the high temperature corrosion probability of burner hearth coking and water-cooling wall increase greatly.
For traditional quadrangle tangential circle coal dust furnace; Because wind is arranged on the vertical line with secondary wind, close together makes mixing morning of primary and secondary air; Reduce in wind the burning time of coal dust in strong reducing property atmosphere, suppressed to generate fuel type NO xAbility drop.
The decoupling burning technology can realize removing the fly ash combustible material and the NO of coal burning xCoupling discharging relation, be to reduce fly ash combustible material and NO simultaneously xThe effective ways of discharging, its mechanism is: the coal burning process is divided into two stages, and the phase I, pyrolysis, gasification and gas-fired take place in coal under very high reducing atmosphere, and the pyrolysis and the gasification product that make full use of coal self are with fuel type NO xBe converted into more stable N 2Second stage is created high-temperature oxygen-enriched but is not produced heating power type NO xEnvironment, guarantee the abundant after-flame of coal again.
This shows; Decoupling burning suppresses the critical process of NOx discharging; The conversion process of the fugitive constituent nitrogen that produces at burning initial stage pyrolytic gasification; This process mainly less spatial dimension before wind inside, secondary wind are mixed is carried out, wind with promptly begin the after-flame stage after secondary wind is mixed, do not need the burn reducing atmosphere of burner hearth on a large scale of generation of aforesaid air classification.This process is the fractional combustion that belongs on the microcosmic, and just mechanism is different from the air classification burning on the aforesaid macroscopic view, and the reducing agent of decoupling burning has made full use of the pyrolytic gasification product, and reactivity is higher.
Patent " low-nitrogen oxide discharging coal powder decoupling burning device and coal dust decoupling burning method " (Chinese utility application number: 201110033811.8) utility model a kind of coal dust decoupling burning device and coal dust decoupling burning method; This technology mainly relies on the performance of burner self; Do not have to combine, thereby suppress NO with the secondary wind air distribution of boiler xThe ability of discharging receives certain limitation.
For the boiler of traditional corner tangential firing, burner arrangement is in four bights, and this zone furnace temperature is lower, during a wind wind powder mixture ejection, for the smooth combustion and the inhibition NO of boiler xDischarging all unfavorable, it is difficult when coal-fired particularly to use low-volatile and low heat value etc., problem is more outstanding.
In addition; Traditional corner tangential firing stove; Burner usually adopts the mode of swing vertically to regulate the height of flame kernel, thereby regulates main, reheat steam temperature, and this mode makes wind and secondary wind to swing simultaneously; Excessive pivot angle of wind snout makes coal dust very serious to the erosive wear of the spout of at high temperature working, and the burner life-span descends greatly.And; Because the connecting rod transmission in the cover mechanism is more; Length of connecting rod and bearing pin location keep unified demand just higher, but because there are irregular thermal expansion in body of heater and burner wind-box, make that the fault rate of this pendulous device is very high; Often ineffective for a long time, influence the combustion characteristics of boiler.
The utility model content
The purpose of the utility model is, in order to overcome the problems referred to above, thereby provides a kind of polygonal circle of contact multiple dimensioned coal dust decoupling combustion device.
To achieve these goals; The utility model provides a kind of polygonal circle of contact multiple dimensioned coal dust decoupling combustion device; Said device comprises polygonal tangential firing burner hearth; This polygonal tangential firing burner hearth comprises the wind snout 3, one-level overfire air port 7 and the center after-flame wind snout 9 that are provided with along short transverse that burner hearth angle wall 2 and the row on burner hearth side wall 4, the polygonal tangential firing burner hearth are above, it is characterized in that
A described wind snout 3 adopts the concentration of local arrangement, and at least 2 or an above wind snout 3 neighbouring centralized arrangement arrange thereunder that again one-level overfire air port 7 forms a subregion sets of burners; Fractions area burner group forms row, and above the subregion sets of burners of the top, center after-flame wind snout 9 is set;
The nearside of wind snout of described every row 3 and the one-level overfire air port 7 row secondary overfire air port 1 that all has been arranged in parallel; This row secondary overfire air port 1 adopts the concentration of local arrangement; At least 2 or above secondary overfire air port 1 neighbouring centralized arrangement form some minutes region two-stage overfire air port groups, corresponding to the setting of described subregion sets of burners; Its number is identical with the subregion sets of burners, and its height is corresponding with the subregion sets of burners; Above said minute region two-stage overfire air port group of the top, periphery after-flame wind snout 8 is set.
As a kind of improvement of technique scheme, described polygonal tangential firing burner hearth is corner tangential firing burner hearth or anistree tangential firing burner hearth.
A kind of improvement as technique scheme; Described every row secondary overfire air port 1 and periphery after-flame wind snout 8 thereof are arranged on the wall of burner hearth angle; Accordingly, wind snout 3 of described every row, one-level overfire air port 7 and center after-flame wind snout 9 thereof are arranged on the burner hearth side wall; Or described secondary overfire air port 1 and periphery after-flame wind snout 8 thereof are arranged on the burner hearth side wall, and accordingly, wind snout 3 of described every row, one-level overfire air port 7 and center after-flame wind snout 9 thereof are arranged on the wall of burner hearth angle; Or; Wind snouts of described every row (3), one-level overfire air port (7) and center after-flame wind snout (9) thereof are arranged at burner hearth side wall one side, and keep certain intervals each other with the secondary overfire air port (1) and the periphery after-flame wind snout (8) thereof that are arranged on the same side wall of burner hearth.
Because the rotation of flue gas rising operation in the burner hearth; The flue gas upstream and downstream is relative; Thereby; Above-mentioned secondary overfire air port 1 can be arranged in the upper reaches of a wind snout 3 as mesoscale air stage feeding spout, also can be arranged in downstream, secondary overfire air port group and also can all being arranged on the burner hearth side wall with wind snout 3 of every row, one-level overfire air port 7 and the center after-flame wind snout 9 of correspondence; As long as keep certain intervals can realize the purpose of fractional combustion each other, but secondary overfire air port group is arranged on coking and high temperature corrosion that downstream more help suppressing furnace wall.
As a kind of improvement of technique scheme, a described wind snout 3 adopts coal dust decoupling burning device.
As a kind of improvement of technique scheme, described one-level overfire air port 7 adopts a cover independently to carry out the structure that level swings; The structure that described secondary overfire air port 1 adopts a cover independently to swing vertically; Described periphery after-flame wind snout 8 adopts a cover independently to carry out level simultaneously separately with center after-flame wind snout 9 and swings and the structure of swinging vertically.
As a kind of improvement of technique scheme, be provided with igniting and combustion-supporting oil gun in the described one-level overfire air port 7; Said wind snout 3 set inside igniting and combustion-supporting small oil gun or plasma ignition device.
As a kind of improvement of technique scheme, described center after-flame wind snout (9) adopts single spout, or, adopting up and down or the left and right sides adjacent 2 and above center after-flame wind snout (9) are formed one group, each spout is independently arranged.Center after-flame wind snout 9 also can only be established a spout, also can adopt up and down or left and right sides dispersed placement by a plurality of spouts.
As a kind of improvement of technique scheme, described periphery after-flame wind snout (8) adopts single spout, or, adopt neighbouring 2 and above periphery after-flame wind snout (8) to form one group, each spout is independently arranged.After-flame wind snout 8 also can only be established a spout, also can adopt dispersed placement up and down by a plurality of spouts.
As a kind of improvement of technique scheme, described periphery after-flame wind snout 8 is or/and the below of center after-flame wind snout 9 also is provided with tertiary air spout or weary gas blowout mouth, be beneficial to coal dust that tertiary air or weary gas carries in the high-temperature region after-flame.
As a kind of improvement of technique scheme, the upstream and downstream, both sides of each spout are provided with the slit are set respectively on the described burner hearth side wall, are used to regulate furnace wall neighbouring oxygen amount and temperature, and regulate wind and can protect each spout, and protection breeze airflow washing away furnace wall.
The utility model realizes reducing simultaneously fly ash combustible material and NO according to coal dust firing characteristic and material transformation rule xThe decoupling burning of discharging;
On micro-scale; Through wind snout of the every row on the polygonal tangential firing burner hearth 3 is adopted at least 2 or the above neighbouring centralized arrangement mode of spout; Arrange thereunder that again one-level overfire air port 7 forms a subregion sets of burners; The subregion sets of burners that some wind snouts 3 in every row form, centralized arrangement utilizes the height of a wind snout of decoupling burning device to concentrate and the heated at high speed characteristic apart from the very high zone of the nearer fire box temperature of flame kernel relatively; Make the air-flow of burner nozzle directive burner hearth form strong reducing property and week reduction zone respectively in front and back, realize multi-region footpath fractional combustion forwards, backwards;
On mesoscale; By the row secondary overfire air port 1 that all has been arranged in parallel of the nearside at wind snout of described every row 3 and one-level overfire air port 7; This row secondary overfire air port 1 adopts the concentration of local arrangement; At least 2 or above secondary overfire air port 1 neighbouring centralized arrangement form some groups, are provided with corresponding to described subregion sets of burners; This secondary overfire air port 1 with form strong reducing property zone and week reduction or weak oxide zone respectively, realization multi-region level left and right sides fractional combustion before and after the wind that wind snout 3 comes out mixes;
On macro-scale, through periphery after-flame wind snout 8 and center after-flame wind snout 9 being set, make lower furnace portion and top form reproducibility zone and oxidisability zone respectively in big upper furnace, realize air classification burning vertically.
The advantage of the utility model is; Multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact that the utility model provides and combustion method are according to coal dust firing characteristic and material transformation rule; Given full play in the multi-region footpath of burning on the initial stage micro-scale forwards, backwards on fractional combustion characteristic and the mesoscale multi-region level left and right sides fractional combustion; Solve different problems at different scale with regional emphasis; Guaranteeing under the condition of security that the chronic disease that gram is separated coal dust firing coupling discharging realizes reducing simultaneously fly ash combustible material and NO xThe decoupling burning of discharging.
Imbody comprises:
1, the utility model given full play in multi-region footpath that burning utilizes a wind snout of decoupling burning device on the initial stage micro-scale forwards, backwards the fractional combustion characteristic, in the multi-region level left and right sides fractional combustion characteristic of burning mesoscale in mid-term with on the middle and later periods macro-scale of burning, utilize big burner hearth air classification aptitude to burn vertically.
At first, through multiple dimensioned multi-region fractional combustion, accomplish NO earlier xTo N 2Conversion, secondary wind is in time replenished, and lets coal dust that high-temperature oxygen-enriched reaction in time takes place, and prolong in the clean-burning time of burner hearth, thereby abundant after-flame reduces the content of fly ash combustible material, CO in the flue gas.
Secondly,, thereby help avoiding occurring local burnup and the too concentrated environment of oxygen, produce excessive high-temperature oxygen-enriched combustion peak, help suppressing heating power type NO because the multi-region property of burning has increased the uniformity in the burner hearth internal combustion xGeneration.
In a word, suppress NO through multiple dimensioned multi-region fractional combustion xGeneration; Can reduce the burn dependence of needed big reducing zone of the big burner hearth air classification of tradition; Reducing burning-out zone increases temperature, the space of burning-out zone to the distance of main combustion zone; Increase burnout velocity and tail-off time, thereby gram is separated the chronic disease of its coupling discharging, realizes reducing simultaneously fly ash combustible material and NO xThe decoupling burning of discharging.
2, the burner of the utility model; Relative centralized arrangement of wind snout is apart from the very high zone of the nearer fire box temperature of flame kernel; Not only help difficult coal-fired steady combustion, and help improving the pyrolytic gasification speed that wind is injected the coal dust of burner hearth, can increase the burning initial stage NO xThe concentration of the pyrolytic gasification product of the coal self that reproducibility is stronger, fugitive constituent is separated out the ratio that also can increase fugitive constituent nitrogen fast simultaneously, reduces the ratio of coke nitrogen, for decoupling burning suppresses NO xGeneration created better condition;
3, the burner of the utility model; Part secondary overfire air port can centralized arrangement mix combustion-supporting in the downstream of a wind with a wind; Like this can be in burner hearth along airflow direction from a wind to the overfire air port; Form bigger local reduction property combustion zone, a plurality of zones, prolonged coal dust, suppress fuel type and heating power type NO thereby strengthen than the burning time under the strong reducing property atmosphere xGenerative capacity, reduce NO xDischarging;
4, the burner of the utility model; Oxygen content had reduced and has been heated to very high-temperature before the firsts and seconds secondary wind of the wind in the combustion-supporting upper reaches of part was mixed with the wind in downstream in burner hearth; Relative centralized arrangement in conjunction with a wind snout; Fully realize the condition of high-temperature air burning, promptly helped suppressing simultaneously fuel type and heating power type NO xGeneration, also can realize steady combustion;
5, the burner of the utility model; Compare with corner tangential firing; Primary air jet is further from furnace wall, through regulating the air quantity of each row secondary overfire air port group, can be in burner hearth secondary secondary wind downstream near near the easy coking scope the furnace wall; Form secondary wind and surround the rotary power field of a wind, not only help realizing reducing NO xThe burning step by step of discharging also helps preventing the coking and the high temperature corrosion of furnace wall.
6, compare with the quadrangle tangential circle boiler; Overfire air port and after-flame wind snout in wind snout 3 of every row of the utility model, secondary overfire air port 1 and the center after-flame wind snout 9 are nearer apart from the burner hearth center; Permeate gas stream is stronger to the ability at burner hearth center, thereby can strengthen comprising that the wind powder of the whole furnace cavity at burner hearth middle part mixes, and makes the timely after-flame of coal dust; Help reducing unburned carbon in flue dust, strengthen the effect of decoupling burning.
7, the utility model makes up aerodynamic field, temperature field and the concentration field of regulating in the burner hearth through level and vertical oscillation overfire air port; And one time wind snout can not swung with overfire air port; Thereby can reduce the rate of wear of a wind snout, improve service life.Swing mechanism is decomposed into multiple; Part only need be carried out simple manual adjustments; Only reserve part is regulated more frequent spout and is adopted the execution adjusting of remote control and regulation mechanism, can reduce the complexity and the live load of swing mechanism like this, reduces the fault rate of this mechanism.
To sum up, burner of the utility model and method thereof are except there being reliable decoupling burning technical performance; Also have combustibilities such as outstanding steady combustion ability, anti-coking and easy adjusting, not only difficult fire coal and easy baking coal and other colm etc. are had better adaptability, simultaneously; Because it is comparatively concentrated that the combustion zone is arranged; Traditional relatively pulverized-coal fired boiler also helps reducing the chamber design height, reduces and makes and installation cost.
Description of drawings
Fig. 1 is the vertical view sketch map of the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact of the utility model,
Fig. 2 is the side view sketch map of the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact of the utility model.
The accompanying drawing sign
1, secondary overfire air port 2, burner hearth angle wall 3, a wind snout
4, burner hearth side wall 5, wind imaginary circle 6, secondary secondary wind imaginary circle
7, one-level overfire air port 8, periphery after-flame wind snout 9, center after-flame wind snout
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
As shown in Figure 1; The multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact in the present embodiment adopts the coal dust decoupling burning stove of quadrangle tangential circle; Wind snout 3 of four row, one-level overfire air port 7 and center after-flame wind snout 9 thereof are installed on the four sides burner hearth side wall 4; Accordingly, four row secondary overfire air ports 1 and periphery after-flame wind snout 8 thereof are installed on four burner hearth angle walls 2;
As shown in Figure 2, a said wind snout 3 can adopt coal dust decoupling burning device, and adopts the concentration of local arrangement, and neighbouring 2 and an above wind snout 3 are formed one group and be arranged on the burner hearth side wall 4; Igniting and combustion-supporting small oil gun or plasma ignition device also can be set in the said wind snout 3; The below that one-level overfire air port 7 is arranged in this wind snout group forms a subregion sets of burners, and side wall upper edge short transverse can be arranged many these subregion sets of burners of group; One-level overfire air port 7 on this side wall adopts the structure that can carry out horizontal hunting, under specialized organization drives, can make the spout spray angle do level and swing; Igniting and combustion-supporting oil gun also can be set in the one-level overfire air port 7 on the said side wall; Also can arrange a plurality of spouts up and down continuously for the one-level overfire air port 7 on this side wall of different coals, also can between a wind, insert this spout of low discharge;
Said four row secondary overfire air ports 1 adopt the concentration of local arrangement, and neighbouring 2 and above secondary overfire air port 1 are formed one group and be arranged on the burner hearth angle wall 2, form and divide a region two-stage overfire air port group; This minute region two-stage overfire air port group quantity with aforementioned side wall on the subregion sets of burners of installing identical, and on absolute altitude, this minute region two-stage overfire air port group corresponding with aforementioned each subregion sets of burners; Said secondary overfire air port 1 adopts the structure that can swing vertically, under specialized organization drives, can make the spray angle of each spout of subregion overfire air port group do swing vertically;
Center after-flame wind snout 9 is positioned at the top of the subregion sets of burners of aforementioned the top, and with the subregion sets of burners of the top at a distance of certain distance; Center after-flame wind snout 9 adopts the structure of level and vertical oscillation simultaneously, under specialized organization drives, can make the spray angle of this center after-flame wind snout 9 do about level and swing vertically; Center after-flame wind snout 9 can adopt the concentration of local arrangement, up and down or the left and right sides adjacent 2 and above center after-flame wind snout 9 form one group and be arranged on the burner hearth side wall 4; Center after-flame wind snout 9 also can only be established a spout, also can adopt up and down or left and right sides dispersed placement by a plurality of spouts;
Periphery after-flame wind snout 8 is positioned at the top of the branch region two-stage overfire air port group of aforementioned the top, and with the subregion overfire air port group of the top at a distance of certain distance; Periphery after-flame wind snout 8 adopts the structure of level and vertical oscillation simultaneously, under specialized organization drives, can make the spray angle of this each spout of after-flame wind do about level and swing vertically; Periphery after-flame wind snout 8 can adopt the concentration of local arrangement, and neighbouring 2 and above periphery after-flame wind snout 8 are formed one group and be arranged on the burner hearth angle wall 2, and after-flame wind snout 8 also can only be established a spout, also can adopt dispersed placement up and down by a plurality of spouts;
The absolute altitude of each layer subregion sets of burners of installing on the said four sides burner hearth side wall 4 is corresponding; The spray centerline of each wind snout 3 collects in burner hearth and surrounds a wind imaginary circle 5 tangent with spray centerline, that the direction that rotatablely moves is consistent;
The absolute altitude of each layer branch region two-stage overfire air port group of installing on said four jiaos of burner hearth angle walls 2 is corresponding; The spray centerline of each secondary overfire air port 1 collects in burner hearth and surrounds a secondary secondary wind imaginary circle 6 tangent with spray centerline, that the direction that rotatablely moves is consistent;
In the practical application, through changing wind snout 3 horizontal installation site and the angle of spray centerline and the angle of secondary overfire air port 1 spray centerline, the diameter of a wind imaginary circle can be greater than also can be less than the diameter of secondary secondary wind imaginary circle; The direction of rotation of two imaginary circles can be identical, also can be opposite; The diameter of a wind imaginary circle also can be zero.
For the system that is provided with tertiary air spout or weary gas blowout mouth, can tertiary air spout or weary gas blowout mouth be located under periphery after-flame wind snout 8 or the center after-flame wind snout 9, be beneficial to coal dust that tertiary air or weary gas carries in the high-temperature region after-flame.
Upstream and downstream through each spout on side wall are provided with adjusting wind, and oxygen amount and temperature near the scalable furnace wall are protected each spout, and the protection breeze airflow alleviates the coking and the high temperature corrosion of heating surface to the washing away of furnace wall.According to the design of the utility model, it is less to regulate the wind air quantity, can not establish spout, just gets into from the slit that burner hearth is opened.
The secondary overfire air port 1 of the utility model also all can be arranged on the side wall; Belong to secondary secondary wind; Because the rotation of flue gas rising operation in the burner hearth, the flue gas upstream and downstream is relative, thereby above-mentioned secondary overfire air port 1 can be arranged in the upper reaches of the last wind snout of side wall as mesoscale air stage feeding spout; Also can be arranged in downstream, as long as keep certain intervals can realize the purpose of fractional combustion each other.But be arranged on coking and high temperature corrosion that downstream more help suppressing furnace wall.
The step of the utility model coal dust decoupling burning comprises in addition:
1) wind snout 3 adopts and the thick coal culm air-flow is arranged and to the burner of air-flow Fast Heating in coal dust decoupling burning devices or other wind; The thick coal culm air-flow at first by burner hearth high-temperature flue gas heated at high speed, is heated to ignition temperature rapidly, and the pyrolytic gasification of high temperature and high speed has significantly increased fugitive constituent nitrogen ratio simultaneously, and the NH in the fugitive constituent of coal pyrolytic gasified back 3, NCH, C mH n(hydrocarbon), CO have strong reducing property and high concentration, the NO that this stage fugitive constituent nitrogen generates xBut major part changes into stable N 2Radially flow to burner hearth with breeze airflow, the oxygen in light powder air-flow and one-level secondary wind and the burner hearth is progressively sneaked into successively, because semicoke takes fire, to the consumption increase of oxygen, therefore the air-flow of this burning is under the reducing atmosphere all the time, can significantly suppress NO xGeneration; The different phase of this combustion process mainly is created near each wind snout outlet, and the flow process of air-flow after by forward direction radially, thereby the multi-region footpath that belongs to micro-scale fractional combustion forwards, backwards;
After one time the wind wind powder mixture gets into the burner hearth certain depth by a wind snout 3, along with flue gas is done the rotation rising in burner hearth;
2) the one-level secondary wind gets into burner hearth by the one-level overfire air port that is positioned at a wind snout group below 7; This air-flow mixes rotation gradually and rises with an aforementioned wind; Segregation to prevent a wind coal dust falls, and its air that replenishes can make coal dust keep lasting stronger reproducibility burning simultaneously; And when this one-level overfire air port 7 is done horizontal hunting, can change the entering angle of air-flow, thereby the mixing opportunity of the aerodynamic field intensity of regulating swirling eddy in the burner hearth and control and a wind; In this secondary wind oil gun can be set, oil fired torch to be provided in ignition of the boiler and combustion-supporting stage.
3) secondary secondary wind then gets into burner hearth by the secondary overfire air port in every row overfire air port group 1, for form strong swirling eddy at burner hearth power is provided, and the wind wind powder mixed airflow that this air-flow comes with upper reaches rotation mixes gradually, and rotation is risen; Because this secondary wind air-flow receives pushing of upstream airflow; Be in the outside of swirling eddy relatively; Surround inner flue gas of the stove on a large scale, its air that replenishes still can make upper reaches coal dust continue to keep the reproducibility burning, and this air-flow also can stop coal dust to wash away furnace wall simultaneously; And prevent stronger reducing atmosphere to occur near the furnace wall, coking and high temperature corrosion do not take place in the protection furnace wall; Described every row overfire air port group can swing up and down, thus the center of up-down adjustment furnace flame;
This secondary wind increases the air-flow oxygen content for upper reaches breeze airflow provides combustion air partly, impels the quick after-flame of coal dust; The different phase of this combustion process mainly is created between the upstream and downstream of secondary secondary wind that burner hearth horizontally rotates air-flow.The wind in the upper reaches is to being than strong reducing property atmosphere between the secondary secondary wind; The secondary secondary wind is weak oxide property or weak reducing atmosphere between the wind in downstream, and in this interval along the circumferential air-flow of the level flow process of (or from right to left) from left to right, average oxygen content reduces gradually.With respect near the fractional combustion of the micro-scale spout, this combustion process belongs to the multi-region level left and right sides fractional combustion of mesoscale;
Than strong reducing property atmosphere district, rest parts coke nitrogen further is converted into N in the coal dust 2After the zone, the ratio of coke nitrogen is very low, and, because it will pass through the reproducibility interface on pulverized coal particle surface when separating out, make coke nitrogen to NO xThe conversion ratio that transforms is very low;
4) after-flame wind in center gets in the burner hearths via center after-flame wind snout 9, in the flue gas that rises with aforementioned rotation near the burner hearth center partially mixed evenly, for unburnt coal dust in time provides the after-flame air; When the spray angle of this each spout of after-flame wind is done level and is swung; The rotary power intensity of scalable burner hearth flue gas; Regulate the distribution of upper furnace and exit gas temperature; Can avoid furnace outlet zones of different cigarette temperature excessive deviation to occur through the spin intensity that weakens swirling eddy, also can regulate boiler master, reheat steam temperature in the furnace(heat) liberation amount through flue-gas temperature and flue gas near the adjusting furnace wall; The spray angle of this each spout of after-flame wind is done when swinging vertically, can regulate boiler master, reheat steam temperature through the center of up-down adjustment furnace flame, and the mixing opportunity of control after-flame wind and rising flue gas, to control NO xCoupling discharging with fly ash combustible material;
5) periphery after-flame wind is got in the burner hearths by periphery after-flame wind snout 8, with in the flue gas that rises near furnace wall partially mixed evenly, for unburnt coal dust in time provides the after-flame air; When the spray angle of this each spout of after-flame wind is done level and is swung; The rotary power intensity of scalable burner hearth flue gas; Regulate the distribution of upper furnace and exit gas temperature; Can avoid furnace outlet zones of different cigarette temperature excessive deviation to occur through the spin intensity that weakens swirling eddy, also can regulate boiler master, reheat steam temperature in the furnace(heat) liberation amount through flue-gas temperature and flue gas near the adjusting furnace wall; The spray angle of this each spout of after-flame wind is done when swinging vertically, can regulate boiler master, reheat steam temperature through the center of up-down adjustment furnace flame, and the mixing opportunity of control after-flame wind and rising flue gas, to control NO xCoupling discharging with fly ash combustible material;
6) according to boiler NO xWith the coupling of fly ash combustible material discharging relation and security requirement, use the difference of coal for boiler, the air distribution mode of said secondary wind and after-flame wind is also different;
The secondary wind ratio of said secondary overfire air port 1 of flowing through accounts for 15%~80% of secondary wind and after-flame wind total amount; Along with the flammable enhancing of fire coal, this air quantity can reduce; If the coking situation of boiler furnace is heavier, can increase this air quantity;
The secondary wind ratio of said one-level overfire air port 7 of flowing through accounts for 15%~80% of secondary wind and after-flame wind total amount; Along with the flammable enhancing of fire coal, this air quantity can increase;
The after-flame wind ratio of said periphery after-flame wind snout 8 of flowing through accounts for 0%~30% of secondary wind and after-flame wind total amount; Along with the flammable enhancing of fire coal, this air quantity can reduce; If will improve boiler master, reheat steam temperature, then can increase this air quantity;
The after-flame wind ratio of said center after-flame wind snout 9 of flowing through accounts for 0%~30% of secondary wind and after-flame wind total amount; Along with the flammable enhancing of fire coal, this air quantity can reduce; If will improve boiler master, reheat steam temperature, then can increase this air quantity; If unburned carbon in flue dust is bigger, this air quantity of scalable is at best of breed;
Usually in order to reduce boiler NO xDischarging, can increase after-flame air quantity and secondary secondary air flow;
The utility model adopts multiple dimensioned multi-region staged-combustion method; Utilize the height of a wind snout of decoupling burning device to concentrate and the heated at high speed characteristic on the micro-scale, make the air-flow of burner nozzle directive burner hearth form strong reducing property and week reduction zone respectively in front and back, realize multi-region footpath fractional combustion forwards, backwards; Before and after mesoscale mixes through the wind in the secondary secondary wind and the upper reaches, form strong reducing property zone and week reduction or weak oxide property zone respectively, realize multi-region level left and right sides fractional combustion; On macro-scale,, make lower furnace portion and top form reproducibility zone and oxidisability zone respectively, realize air classification burning vertically through after-flame wind being set in big upper furnace.
On burning initial stage micro-scale, create inhibition fuel type NO through means such as and heated at high speed concentrated to the height of a wind breeze airflow xThe advantage that generates, emphasis are to impel to produce more fugitive constituent nitrogen and to N 2Transform;
Burning mid-term, emphasis is controlled concentration field and temperature field through the oxygen content of control mixed airflow, comes further to suppress fuel type NO xGeneration, impel coke nitrogen to N 2Conversion; Avoid occurring producing a large amount of heating power type NO that generate simultaneously xHigh-temperature oxygen-enriched condition;
Through aforementioned means, made most of fuel bound nitrogen be converted into stable N 2, in the middle and later periods of burning, can be through in time sending into the after-flame air, and in time mix in the higher zone of inner of the boiler chamber temperature, make combustible that the condition of abundant after-flame arranged, reduce the content of fly ash combustible material in the flue gas; This shows that multiple dimensioned multi-region fractional combustion is according to coal dust firing characteristic and material transformation rule; Solve different problems at different scale with regional emphasis; Guaranteeing under the condition of security that the chronic disease that gram is separated coal dust firing coupling discharging realizes reducing simultaneously fly ash combustible material and NO xThe decoupling burning of discharging.
It should be noted last that above embodiment is only unrestricted in order to the technical scheme of explanation the utility model.Although the utility model is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; The technical scheme of the utility model is made amendment or is equal to replacement; The spirit and the scope that do not break away from the utility model technical scheme, it all should be encompassed in the middle of the claim scope of the utility model.

Claims (10)

1. multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact; Said device comprises polygonal tangential firing burner hearth; This polygonal tangential firing burner hearth comprises the wind snout (3), one-level overfire air port (7) and the center after-flame wind snout (9) that are provided with along short transverse that the row on burner hearth angle wall (2) and burner hearth side wall (4), the polygonal tangential firing burner hearth are above; It is characterized in that
A described wind snout (3) adopts the concentration of local arrangement, and at least 2 or the above neighbouring centralized arrangement of a wind snout (3) arrange thereunder that again one-level overfire air port (7) forms a subregion sets of burners; Fractions area burner group forms row, and above the subregion sets of burners of the top, center after-flame wind snout (9) is set;
The nearside of wind snouts of described every row (3) and one-level overfire air port (7) the row secondary overfire air port (1) that all has been arranged in parallel; This row secondary overfire air port (1) adopts the concentration of local arrangement; At least 2 or the above neighbouring centralized arrangement of secondary overfire air port (1) form some minutes region two-stage overfire air port groups, corresponding to the setting of described subregion sets of burners; Its number is identical with the subregion sets of burners, and its height is corresponding with the subregion sets of burners; Above said minute region two-stage overfire air port group of the top, periphery after-flame wind snout (8) is set.
2. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 is characterized in that, described polygonal tangential firing burner hearth is corner tangential firing burner hearth or anistree tangential firing burner hearth.
3. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2; It is characterized in that; Described every row secondary overfire air port (1) and periphery after-flame wind snout (8) thereof are arranged on the wall of burner hearth angle; Accordingly, wind snouts of described every row (3), one-level overfire air port (7) and center after-flame wind snout (9) thereof are arranged on the burner hearth side wall; Or described secondary overfire air port (1) and periphery after-flame wind snout (8) thereof are arranged on the burner hearth side wall, and accordingly, described wind snouts of every row (3), one-level overfire air port (7) and center after-flame wind snout (9) thereof are arranged on the wall of burner hearth angle; Or; Wind snouts of described every row (3), one-level overfire air port (7) and center after-flame wind snout (9) thereof are arranged at burner hearth side wall one side, and keep certain intervals each other with the secondary overfire air port (1) and the periphery after-flame wind snout (8) thereof that are arranged on the same side wall of burner hearth.
4. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2 is characterized in that, a described wind snout (3) adopts coal dust decoupling burning device.
5. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2 is characterized in that, described one-level overfire air port (7) adopts a cover independently to carry out the structure that level swings; The structure that described secondary overfire air port (1) adopts a cover independently to swing vertically; Described periphery after-flame wind snout (8) and center after-flame wind snout (9) adopt a cover independently to carry out level simultaneously separately and swing and the structure of swinging vertically.
6. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2 is characterized in that, is provided with igniting and combustion-supporting oil gun in the described one-level overfire air port (7); Igniting of a said wind snout (3) set inside and combustion-supporting small oil gun or plasma ignition device.
7. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2; It is characterized in that described center after-flame wind snout (9) adopts single spout, or; Adopt up and down or the left and right sides adjacent 2 and above center after-flame wind snout (9) are formed one group, each spout is independently arranged.
8. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2; It is characterized in that described periphery after-flame wind snout (8) adopts single spout, or; Adopt neighbouring 2 and above periphery after-flame wind snout (8) to form one group, each spout is independently arranged.
9. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2; It is characterized in that; Described periphery after-flame wind snout (8) is or/and the below of center after-flame wind snout (9) also is provided with tertiary air spout or weary gas blowout mouth, be beneficial to coal dust that tertiary air or weary gas carries in the high-temperature region after-flame.
10. the multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact according to claim 1 and 2; It is characterized in that; The upstream and downstream, both sides of each spout are provided with the slit are set respectively on the described burner hearth side wall; Be used to regulate furnace wall neighbouring oxygen amount and temperature, protect each spout, and protection breeze airflow washing away furnace wall.
CN2011204675277U 2011-11-22 2011-11-22 Multi-angular tangential circle multi-scale coal dust decoupling combustion device Withdrawn - After Issue CN202350012U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103134049A (en) * 2011-11-22 2013-06-05 中国科学院过程工程研究所 Multi-corner tangential multi-scale pulverized coal decoupling combustion device and decoupling combustion method thereof
CN103267303A (en) * 2013-05-15 2013-08-28 大唐林州热电有限责任公司 NOx generation reducing method for four-corner tangential boiler of thermal power plant
CN103672863A (en) * 2013-12-31 2014-03-26 北京国电龙高科环境工程技术有限公司 Low-nitrogen combustion device for medium storage cabin hot air powder feeding boiler and use method thereof
CN104865989A (en) * 2015-03-26 2015-08-26 中南大学 Decoupling control method and system for temperature field regional control system
CN109578992A (en) * 2018-10-24 2019-04-05 苏州西热节能环保技术有限公司 The method of SOFA air door adjusting tangentially-fired boiler reheat steam temperature two sides deviation
CN110864281A (en) * 2019-09-30 2020-03-06 南京江宁区上峰国银标准件厂 Fluidized furnace with water-cooled wall soaking heat preservation mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103134049A (en) * 2011-11-22 2013-06-05 中国科学院过程工程研究所 Multi-corner tangential multi-scale pulverized coal decoupling combustion device and decoupling combustion method thereof
CN103134049B (en) * 2011-11-22 2015-09-30 中国科学院过程工程研究所 A kind of multiple dimensioned coal dust decoupling combustion device of the polygonal circle of contact and decoupling burning method thereof
CN103267303A (en) * 2013-05-15 2013-08-28 大唐林州热电有限责任公司 NOx generation reducing method for four-corner tangential boiler of thermal power plant
CN103267303B (en) * 2013-05-15 2016-05-04 大唐林州热电有限责任公司 A kind of thermal power plant Process In A Tangential Firing reduces the method that NOx generates
CN103672863A (en) * 2013-12-31 2014-03-26 北京国电龙高科环境工程技术有限公司 Low-nitrogen combustion device for medium storage cabin hot air powder feeding boiler and use method thereof
CN104865989A (en) * 2015-03-26 2015-08-26 中南大学 Decoupling control method and system for temperature field regional control system
CN104865989B (en) * 2015-03-26 2017-02-22 中南大学 Decoupling control method and system for temperature field regional control system
CN109578992A (en) * 2018-10-24 2019-04-05 苏州西热节能环保技术有限公司 The method of SOFA air door adjusting tangentially-fired boiler reheat steam temperature two sides deviation
CN110864281A (en) * 2019-09-30 2020-03-06 南京江宁区上峰国银标准件厂 Fluidized furnace with water-cooled wall soaking heat preservation mechanism

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