CN100387902C - Novel three-region two-stage overfire air arrangement mode for wall type boiler - Google Patents
Novel three-region two-stage overfire air arrangement mode for wall type boiler Download PDFInfo
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- CN100387902C CN100387902C CNB2006100418126A CN200610041812A CN100387902C CN 100387902 C CN100387902 C CN 100387902C CN B2006100418126 A CNB2006100418126 A CN B2006100418126A CN 200610041812 A CN200610041812 A CN 200610041812A CN 100387902 C CN100387902 C CN 100387902C
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Abstract
The present invention discloses a splitting arrangement method for a new three-zone burner of a wall type combustion boiler. A combustion process in a boiler is divided into three zones of stable combustion zone, a combustion and reducing zone, and a combusted zone by controlling the excess air coefficient of the original burner. The defect that the existing low NOx combustion technique has a poor denitration effect is successfully solved by the combusted wind arrangement at one side wall of the combustion and reducing zone to duly supply the combustion air of the combustion and reducing zone, the deep low oxygen and low temperature combustion of initial stage coal powder air current, and the deep fuel staged combustion of the combustion and reducing zone. The influence of new three-zone secondary combusted wind on combustion efficiency is greatly reduced by the supply method of secondary combusted wind (side wall combusted wind and top combusted wind), and thereby, the problem that the denitration effect and the combustion efficiency of the existing NOx combustion technique can not be compromised is successfully solved. The present invention is a burner arrangement method with the favorable denitration effect.
Description
Technical field
The present invention relates to a kind of arrangement of boiler combustion system, the arrangement of particularly a kind of wall firing boiler novel three-region two-stage (side wall or back wall+full burner hearth) after-flame wind.
Background technology
China's coal burning boiler of power station has nearly all adopted low NOx air classification combustion technology, but effect is unsatisfactory, and wherein, the NOx discharge capacity of high volatile coal-burning boiler can be controlled at 650mg/m basically
3About or lower, the NOx discharge capacity of low volatile coal-burning boiler is substantially but still at 1000mg/m
3About or higher.From technical standpoint, this is relevant with the existing technical measures of low NOx air classification combustion technology.The prior art measure also fails effectively to control the excess air coefficient at burning initial stage, thereby has restricted the denitration effect of low NOx air classification combustion technology.On the other hand, on the prior art basis, deepen the burn-off rate that the air classification degree of depth then can influence breeze airflow.How balance this contradiction has been become the significant problem of the low NOx air classification combustion technology development of decision, adopting which kind of technical measures to deepen the air classification degree of depth then becomes and influence the key technical problem that low NOx combusting technology develops.
The experimental study of air classification combustion technology is found: the excess air coefficient that effectively reduces the breeze airflow burning initial stage can restrict the NOx generation at burning initial stage effectively, the after-flame of breeze airflow is then depended on the additional opportunity of after-flame wind.If after-flame wind replenishes in time, and is relatively very little to the influence of breeze airflow after-flame; If it is untimely that after-flame wind replenishes, then can cause bigger influence to the after-flame of breeze airflow.This shows that effectively reducing the excess air coefficient at burning initial stage and in time replenishing after-flame wind is to reduce the NOx discharging significantly, simultaneously again to a very little very effective technological approaches of breeze airflow after-flame influence.But, present low NOx combusting technology and arrangement of burner also can't be accomplished this point, top after-flame wind aftercombustion air too lags behind, can't remedy the too small influence of initiation combustion excess air coefficient to efficiency of combustion, thereby make the air classification low NOx combusting technology can't take into account denitration effect and efficiency of combustion simultaneously, become its developing critical defect, serious restriction the development of air classification low NOx combusting technology.
The fuel-staged combustion engineering test is discovered: the flue gas atmosphere that fuel share and reburning fuel spray in the stove is bigger to firing influential effect again, reburning fuel to spray into the position smaller to the influence of denitration effect, then influence bigger to the after-flame of breeze airflow.This shows that strengthening the reburning fuel share and spraying into regional reducing atmosphere is to reduce a very effective technological approaches of NOx discharging significantly, but must reduce its influence to efficiency of combustion.Existing fuel-staged combustion technology can't be accomplished this point, and the fuel quantity of employing about 15% also is caving-in bash as reburning fuel; Simultaneously certain distance is drawn back in reburning zone and main combustion zone, and it is very big to the influence of the after-flame of breeze airflow to be arranged in the burner top.Thereby make the fuel staging low NOx combusting technology simultaneously can't take into account denitration effect and efficiency of combustion, become its developing critical defect, serious restriction the development of fuel staging low NOx combusting technology.
Summary of the invention
Defective or deficiency at above-mentioned prior art existence, novel three-region two-stage (side wall or back wall+full burner hearth) the after-flame wind arrangement that the purpose of this invention is to provide a kind of wall firing boiler, this arrangement can effectively reduce boiler NOx discharging, and is very little to the influence of breeze airflow after-flame simultaneously.
In order to realize above-mentioned task, the present invention is achieved by following technical scheme:
A kind of wall firing boiler novel three-region two-stage after-flame wind arrangement, it is characterized in that, by original excess air coefficient that is arranged in the burner outlet breeze airflow on front-back wall or the front wall is controlled, combustion process in the stove is divided into 3 zones by furnace height, foot is the smooth combustion district, the middle part is degree of depth low oxygen combustion and reducing zone, and top is the two-phase burning-out zone, and puts the after-flame wind snout of some at side wall or back wall paper;
In the smooth combustion district of lower furnace portion, select the burner of 1-2 floor burner according to the layout of original burner as this district, the excess air coefficient of its burner is controlled at 0.9-1.2, and the burning of these burners is based on the SCS Stabilized Combustion System of routine;
Degree of depth low oxygen combustion and reducing zone at the middle part are arranged the burner of 1-3 floor burner nozzle as this district, and are arranged corresponding with it side wall after-flame air port (hereinafter to be referred as side wall after-flame wind);
Two-phase burning-out zone on top arranges that 1-2 layer top after-flame wind snout (hereinafter to be referred as top after-flame wind), the arrangement of these after-flame wind snouts on short transverse are compact or away from type or compact and the arrangement that combines away from type.
The present invention has following technical characterstic:
1, the present invention utilizes the combustion process that is provided with breeze airflow in the stove of the excess air coefficient control of burner and side wall after-flame wind, top after-flame wind to be divided into three zones, at stabilizing burner, about 25%～75% fuel infeeds from this district, in this district, with conventional combustion system is feature, is characteristics with smooth combustion.In burning and reducing zone, 75%～25% fuel infeeds in the stove from this district, in this district, with air classification burning and fuel-staged combustion is principal character, with breeze airflow initial stage degree of depth low oxygen combustion and region-wide in the NOx reduction reaction be main feature, in this district, excess air coefficient control by burner, make the burner outlet excess air coefficient in the 0.5-0.8 scope, realize the ultralow oxygen burning at breeze airflow burning initial stage, effectively suppress the generation of NOx.Simultaneously, send into the reburning fuel that fuel in the stove is equivalent to the smooth combustion district from this district, reduce the NOx that the smooth combustion district generates by the drastic reduction atmosphere in this kind super-fuel fractional combustion mode and this district, thereby reach the purpose that reduces boiler NOx discharge capacity.In addition, because the layout of side wall after-flame wind has been replenished the catch fire combustion air in later stage of breeze airflow, makes along the phenomenon of journey Flame Temperature Distribution inequality to make moderate progress, and the localized hyperthermia at burning initial stage is decreased, thereby realized the hypothermia and hypoxia burning in this district, heating power type NOx is reduced.This arrangement has successfully solved the drawback that existing low NOx combusting technology can not effectively reduce breeze airflow burning initial stage excess air coefficient and can not strengthen reburning fuel share etc., has successfully solved the problem of existing low NOx combusting technology denitration effect difference.This arrangement is comprising conventional burning, air classification burning, fuel-staged combustion and hypothermia and hypoxia burning theory, and it is organically combined.
2, this arrangement adopts 2 grades of mode aftercombustion air, at first, side wall after-flame wind sprays among the breeze airflow from the middle somewhere of burner hearth horizontal direction, in time to replenish the oxygen amount of breeze airflow combustion process, greatly reduce of the influence of ultralow oxygen combustion system of breeze airflow initial stage to breeze airflow after-flame process.Secondly, at burning-out zone, about 20% combustion air sprays in the stove from this district, replenishes the oxygen amount of breeze airflow after-flame process once more, so that the breeze airflow burning fully.This kind mode is under the condition that does not reduce main burner zone (comprising steady combustion district and burning and reducing zone) excess air coefficient, reduced the excess air coefficient at burning initial stage significantly, simultaneously, in time replenish the required oxygen amount of breeze airflow after-flame process by the layout of side wall after-flame wind, under the condition that does not reduce efficiency of combustion, obtained desirable denitration effect.
3, it is wide that this arrangement has coal adaptability, and any change is not done in the position of original burner, compares with former combustion system.Side wall or back wall after-flame wind and top after-flame wind have only been increased.Arrangement is simple, and system is simple, be very easy to implement, and boiler body external form advantage such as do not change.
Description of drawings
Fig. 1 is the front view of the furnace side of embodiment 1,5;
Fig. 2 is the front view of the furnace side of embodiment 2,6;
Fig. 3 is the front view of the furnace side of embodiment 3,7;
Fig. 4 is the front view of the furnace side of embodiment 4,8;
Fig. 5 is that the A-A of Fig. 1-4 is to view;
Fig. 6 is Fig. 1-4,7-10, and 11-14,15-16, the A-A of 17-20 is to view;
Fig. 7 is the front view of the furnace side of embodiment 9;
Fig. 8 is the front view of the furnace side of embodiment 10;
Fig. 9 is the front view of the furnace side of embodiment 11;
Figure 10 is the front view of the furnace side of embodiment 12;
Figure 11 is the front view of the furnace side of embodiment 13;
Figure 12 is the front view of the furnace side of embodiment 14;
Figure 13 is the front view of the furnace side of embodiment 15;
Figure 14 is the front view of the furnace side of embodiment 16;
Figure 15 is the front view of the furnace side of embodiment 17;
Figure 16 is the front view of the furnace side of embodiment 18;
Figure 17 is the front view of the furnace side of embodiment 19;
Figure 18 is the front view of the furnace side of embodiment 20;
Figure 19 is the front view of the furnace side of embodiment 21;
Figure 20 is the front view of the furnace side of embodiment 22;
Figure 21 is the front view of the furnace side of embodiment 23;
Figure 22 is the front view of the furnace side of embodiment 24;
Figure 23 is the front view of the furnace side of embodiment 25;
Figure 24 is the front view of the furnace side of embodiment 26;
Figure 25 is that the A-A of Figure 21-24 is to view;
Number in the figure 1-is the burner of wall firing mode boiler, and 2-is side wall or back wall after-flame wind snout, and 3-is a top after-flame wind snout, and 4-is the weary gas or the tertiary air spout of wall firing boiler
The present invention is described in further detail below in conjunction with accompanying drawing.
The specific embodiment
Wall firing boiler novel three-region two-stage after-flame wind arrangement of the present invention, excess air coefficient control by different layers burner outlet breeze airflow on the burner furnace height direction is divided into 3 zones with the stove combustion process, foot is smooth combustion district (being designated hereinafter simply as steady combustion district), the middle part is two-phase burning-out zone (abbreviating burning-out zone down as) for degree of depth low oxygen combustion and reducing zone (abbreviating burning and reducing zone down as), top.
The burner of 1-2 floor burner as the smooth combustion district selected according to the arrangement of burner of wall firing boiler by smooth combustion district in the bottom, and to guarantee that smooth combustion is main control, it is worth about 1.0 its excess air coefficient according to coal property;
1-3 layer burner arranged in burning and reducing zone at the middle part, and arranges 1-3 layer side wall or back wall after-flame wind.The outlet excess air coefficient control of this area burner, its objective is at the burning initial stage to form degree of depth low oxygen combustion according to coal in the 0.5-0.8 scope, suppresses the generation of NOx, the NOx that the stabilizing burner that reduces simultaneously generates.Side wall after-flame wind snout is arranged on the both walls of wall firing boiler, the catch fire combustion air in later stage of additional breeze airflow.It is corresponding with the burner nozzle absolute altitude of reducing zone with the middle part burning that absolute altitude is installed.
Two-phase burning-out zone on top is arranged 1-2 layer top after-flame wind snout, and the after-flame wind snout can adopt compact or away from type or compact and the arrangement that combines away from type on short transverse.
Below be the embodiment that the inventor provides.
Embodiment 1:
Referring to Fig. 1 and Fig. 5, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 3 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 6 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 3 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 3 layers of spouts is slightly higher than last 3 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 3 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact or away from type or compact and the arrangement that combines away from type.
Embodiment 2:
Referring to Fig. 2 and Fig. 5, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 3 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 6 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 3 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 3 layers of spouts is slightly higher than last 3 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 3 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame wind snout air-flows are after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 3:
Referring to Fig. 3 and Fig. 5, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 3 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 12 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 4:
Referring to Fig. 4 and Fig. 5, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 3 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 12 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 5:
Referring to Fig. 1 and Fig. 6, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 3 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 3 layers of spouts is slightly higher than last 3 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 3 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 5:
Referring to Fig. 2 and Fig. 6, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 3 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 3 layers of spouts is slightly higher than last 3 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 3 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 7:
Referring to Fig. 3 and Fig. 6, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 16 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 8:
Referring to Fig. 4 and Fig. 6, present embodiment has 4 layers of burner nozzle, divides 4 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 16 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 9:
Referring to Fig. 7 and Fig. 6, present embodiment has 3 layers of burner nozzle, divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 10:
Referring to Fig. 8 and Fig. 6, present embodiment has 3 layers of burner nozzle, divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 11:
Referring to Fig. 9 and Fig. 6, present embodiment has 3 layers of burner nozzle, divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 16 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.The upper strata burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame wind snout air-flows are after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 12:
Referring to Figure 10 and Fig. 6, present embodiment has 3 layers of burner nozzle, divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The most following 2 floor burner are the smooth combustion district, and the outlet excess air coefficient of these 2 layers of 16 burners is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.The upper strata burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame wind snout air-flows are after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 13:
Referring to Figure 11 and Fig. 6, the present embodiment front-back wall burner nozzle that respectively haves three layers, the absolute altitude of 3 layers of burner of back wall are lower than the burner absolute altitude of corresponding 3 layers of front wall, every layer of 4 burner nozzle of every face wall.Front-back wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone on the front-back wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 14:
Referring to Figure 12 and Fig. 6, the present embodiment front-back wall burner nozzle that respectively haves three layers, the absolute altitude of 3 layers of burner of back wall are lower than the burner absolute altitude of corresponding 3 layers of front wall, every layer of 4 burner nozzle of every face wall.Front-back wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 15:
Referring to Figure 13 and Fig. 6, the present embodiment front-back wall burner nozzle that respectively haves three layers, the absolute altitude of 3 layers of burner of back wall are lower than the burner absolute altitude of corresponding 3 layers of front wall, every layer of 4 burner nozzle of every face wall.The following 2 floor burner of front-back wall are the smooth combustion district, and the outlet excess air coefficient of these 16 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Front-back wall upper strata burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 16:
Referring to Figure 14 and Fig. 6, the present embodiment front-back wall burner nozzle that respectively haves three layers, the absolute altitude of 3 layers of burner of back wall are lower than the burner absolute altitude of corresponding 3 layers of front wall, every layer of 4 burner nozzle of every face wall.The following 2 floor burner of front-back wall are the smooth combustion district, and the outlet excess air coefficient of these 16 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.The upper strata burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 17:
Referring to Figure 15 and Fig. 6, present embodiment has 2 layers of burner nozzle and 1 layer of weary gas wind snout, divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Last 1 layer of burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 18:
Referring to Figure 16 and Fig. 6, present embodiment has 2 layers of burner nozzle, and 1 layer of weary gas wind snout divides 3 layers to liquidate and be arranged on the front-back wall of wall firing boiler every layer of 4 burner nozzle of every face wall.The orlop burner is the smooth combustion district, and the outlet excess air coefficient of 8 burner of this layer is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.The upper strata burner nozzle is degree of depth low oxygen combustion and reducing zone, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 19:
Referring to Figure 17 and Fig. 6, the present embodiment front wall burner nozzle that haves three layers, back wall is 2 layers of burner nozzle, every layer of 4 burner nozzle of every face wall.Front-back wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers is degree of depth low oxygen combustion and reducing zone with Hou Qiang upper strata burner nozzle on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 20:
Referring to Figure 18 and Fig. 6, the present embodiment front wall burner nozzle that haves three layers, back wall is 2 layers of burner nozzle, every layer of 4 burner nozzle of every face wall.Front-back wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers is degree of depth low oxygen combustion and reducing zone with Hou Qiang upper strata burner nozzle on the front wall, the excess air coefficient of this area burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 2 floor side wall after-flame wind snouts on 2 side walls at this, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 21:
Referring to Figure 19 and Fig. 6, the present embodiment front wall burner nozzle that haves three layers, back wall is 2 layers of burner nozzle, every layer of 4 burner nozzle of every face wall.Following 2 floor of front wall and back wall orlop burner are the smooth combustion district, and the outlet excess air coefficient of these 12 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers is degree of depth low oxygen combustion and reducing zone with Hou Qiang upper strata burner nozzle on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of last 2 layers of burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact, away from type or compact and the arrangement that combines away from type.
Embodiment 22:
Referring to Figure 20 and Fig. 6, the present embodiment front wall burner nozzle that haves three layers, back wall is 2 layers of burner nozzle, every layer of 4 burner nozzle of every face wall.Following 2 floor of front wall and back wall orlop burner are the smooth combustion district, and the outlet excess air coefficient of these 12 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.Front wall upper strata and Hou Qiang upper strata burner nozzle are degree of depth low oxygen combustion and reducing zone, the excess air coefficient of this area burner outlet is controlled to be in 0.5 to 0.8 the scope, distinguish layout 1 floor side wall after-flame wind snout on 2 side walls at this, the absolute altitude of this layer spout is slightly higher than upper strata burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of upper strata burner on same absolute altitude.2 side wall after-flames of every layer of symmetric arrangement of every side wall wind snout, so that these 2 after-flame general mood flow after the burner hearth central mixing, its aggregate velocity is pointed to burner hearth center, flows to the burner hearth center, with the combustion air of 2 burner breeze airflow after-flame processes in the middle of replenishing.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compactness or away from the type arrangement.
Embodiment 23:
Referring to Figure 21 and Figure 25, present embodiment only front wall has 4 layers of burner nozzle, and back wall does not have burner nozzle, every layer of 4 burner nozzle of front wall.Front wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 4 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, wall after-flame wind snout after arranging 2 floor on this back, district wall, the absolute altitude of these 2 layers of spouts is slightly higher with the 3rd layer of burner nozzle than the 2nd layer, with guarantee after-flame wind center can and the combustion-gas flow center of respective layer burner on same absolute altitude.Wall after-flame wind snout after every layer of correspondence of back wall arranged 4, the spout form is the eddy flow spout.Starve combustion air to replenish this district.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact or away from type or compact and the arrangement that combines away from type.
Embodiment 24:
Referring to Figure 22 and Figure 25, present embodiment only front wall has 4 layers of burner nozzle, and back wall does not have burner nozzle, every layer of 4 burner nozzle of front wall.Front wall orlop burner is the smooth combustion district, and the outlet excess air coefficient of these 4 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.3 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, wall after-flame wind snout after arranging 2 floor on this back, district wall, the absolute altitude of these 2 layers of spouts is slightly higher with the 3rd layer of burner nozzle than the 2nd layer, with guarantee after-flame wind center can and the combustion-gas flow center of respective layer burner on same absolute altitude.Wall after-flame wind snout after every layer of correspondence of back wall arranged 4, the spout form is the eddy flow spout.Starve combustion air to replenish this district.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact or away from the type arrangement.
Embodiment 25:
Referring to Figure 23 and Figure 25, present embodiment only front wall has 4 layers of burner nozzle, and back wall does not have burner nozzle, every layer of 4 burner nozzle of front wall.The most following 2 floor burner of front wall are the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, wall after-flame wind snout after arranging 2 floor on this back, district wall, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of respective layer burner on same absolute altitude.Wall after-flame wind snout after 4 of every layer of corresponding layouts with the front wall firing device of back wall, the spout form is the eddy flow spout.Starve combustion air to replenish this district.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 2 layers of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact or away from type or compact and the arrangement that combines away from type.
Embodiment 26:
Referring to 24 and Figure 25, present embodiment only front wall has 4 layers of burner nozzle, and back wall does not have burner nozzle, every layer of 4 burner nozzle of front wall.The most following 2 floor burner of front wall are the smooth combustion district, and the outlet excess air coefficient of these 8 burners in district is controlled in the scope of 0.9-1.2, and the burning in this district is a principal character with the smooth combustion of breeze airflow.2 layers of burner nozzle are degree of depth low oxygen combustion and reducing zone on the front wall, the excess air coefficient of burner outlet is controlled to be in 0.5 to 0.8 the scope, wall after-flame wind snout after arranging 2 floor on this back, district wall, the absolute altitude of these 2 layers of spouts is slightly higher than last 2 layers of burner nozzle, with guarantee after-flame wind center can and the combustion-gas flow center of respective layer burner on same absolute altitude.Wall after-flame wind snout after 4 of every layer of corresponding layouts with the front wall firing device of back wall, the spout form is the eddy flow spout.Starve combustion air to replenish this district.The total excess air coefficient in this zone is controlled in the scope of 0.8-1.0 according to coal characteristic.
Arrange 1 layer of top after-flame wind snout above burner, the position of its horizontal direction and burner arrangement are corresponding one by one, and the arrangement on its short transverse can be compact or away from the type arrangement.
Operation principle of the present invention is as follows:
Wall firing boiler Xin San district is with the principle of secondary after-flame wind arrangement with routine burning, air classification burning, fuel-staged combustion and hypothermia and hypoxia burning, successfully solve existing low NOx combusting technology and can not effectively reduce drawbacks such as breeze airflow burning initial stage excess air coefficient and increase reburning fuel share, under the condition that does not reduce the primary combustion zone excess air coefficient, can reduce the excess air coefficient of burning and reducing zone breeze airflow initiation combustion significantly.About 75% generated at the burning initial stage in the boiler NOx discharge capacity, and growing amount is directly proportional with excess air coefficient, this shows that the NOx that the excess air coefficient of control burning and reducing zone burner outlet breeze airflow can suppress this district's breeze airflow combustion process greatly generates.Successfully solved simultaneously the drawback that existing low NOx combusting technology can not increase the share of reburning fuel.The fuel quantity that sprays into the 30-75% in the stove from burning and reducing zone is equivalent to surely fire the reburning fuel of district's combustion product, and the super many reburning fuel shares and the reducing atmosphere in this district can be reduced the NOx that surely fires district's generation totally.In addition, side wall after-flame wind is that the furnace flame Temperature Distribution is tending towards evenly, and localized hyperthermia descends to some extent, and certain low-temperature burning effect is arranged.In sum, wall firing boiler Xin San district with secondary after-flame wind arrangement with air classification burn theory, fuel-staged combustion theory and hypothermia and hypoxia burning theory reasonably integrated application be in the same place, can make the denitration effect of coal-burning boiler very obvious, surpassed existing low NOx combusting technology, that is to say that above-mentioned 3 comprehensive function can make the NOx of coal-burning boiler be emitted on reduction greatly on the existing level.
The setting of two-stage over-fire wind compensation way and side wall or back wall after-flame wind meets conventional burning theory.1) replenished the air of breeze airflow combustion process in time, greatly reduced of the influence of initial stage degree of depth low oxygen combustion mode breeze airflow after-flame process.2) the steady breeze airflow that fires the district arranges that according to conventional combustion system its after-flame process is unaffected substantially.Favourable to the after-flame process.Just because of this, this arrangement to the influence of efficiency of combustion less than the air classification combustion technology.
Compare with existing Researched of Air Staging Combustion Burning Pulverized Coal technology, this arrangement is just at 2 of wall firing boiler Set up side wall after-flame wind on the side wall; Compare with the fuel-staged combustion technology, need not to increase the system of firing again, It is very easy to construct, and the boiler body external form need not change, and being used for newly constructed boiler increases any throwing hardly Money when being used for having put into operation boiler improvement, need not increase any equipment to former combustion system, air-supply powder feeding system System also need not to change, and is convenient to very much implement.
Novel three-region two-stage overfire air arrangement mode for wall type boiler of the present invention is adapted to various capacity Wall firing boiler.
Claims (6)
1. wall firing boiler novel three-region two-stage after-flame wind arrangement, it is characterized in that, by to original control that is arranged in the excess air coefficient of the burner outlet breeze airflow on front-back wall or the front wall, combustion process in the stove is divided into 3 zones by furnace height, foot is the smooth combustion district, the middle part is degree of depth low oxygen combustion and reducing zone, and top is the two-phase burning-out zone, and puts the after-flame wind snout at side wall or back wall paper;
In the smooth combustion district of lower furnace portion, select the burner of 1-2 floor burner according to the layout of original burner as this district, the burning of these burners is based on the SCS Stabilized Combustion System of routine;
Degree of depth low oxygen combustion and reducing zone at the middle part are arranged the burner of 1-3 floor burner nozzle as this district, and are arranged corresponding with it side wall after-flame air port;
Two-phase burning-out zone on top, arrange 1-2 layer top after-flame wind snout, the position of these top after-flame wind snout horizontal directions and burner arrangement are corresponding one by one, on its short transverse and the position of burner be compact or away from type or compact and the arrangement that combines away from type.
2. arrangement as claimed in claim 1 is characterized in that, the excess air coefficient in described smooth combustion district is controlled at 0.9-1.2.
3. arrangement as claimed in claim 1 is characterized in that, the excess air coefficient of described degree of depth low oxygen combustion and reducing zone burner outlet is controlled between the 0.5-0.8; On side wall or back wall, arrange corresponding with it after-flame wind snout simultaneously; The number of plies of after-flame wind snout, quantity and install the degree of depth low oxygen combustion at absolute altitude and middle part identical with the burner nozzle number of plies in the reducing zone or less one deck, quantity is identical or one deck quantity less, absolute altitude is corresponding.
4. arrangement according to claim 1, it is characterized in that, the arrangement of described degree of depth low oxygen combustion and reducing zone side wall after-flame wind snout is: every layer of every side wall arranged 2 after-flame wind snouts, these 2 after-flame wind snouts spray in the stove with the angle of inclination in the horizontal direction, after-flame wind snout form is direct current spout or eddy flow spout, and its number of plies is identical with this area burner number of plies or lack 1 layer.
5. arrangement according to claim 1, it is characterized in that, the top after-flame wind snout of described two-phase burning-out zone is the 1-2 layer, be arranged on the front-back wall, mode is a compact or away from type or compact and the arrangement that combines away from type, after-flame wind snout form is the direct current spout, or is the eddy flow spout, can shield the ascending air in the whole stove and finely with it to be mixed into the master.
6. arrangement according to claim 4, it is characterized in that, when original burner of degree of depth low oxygen combustion and reducing zone is the front wall layout, thereafter the arrangement of wall after-flame wind snout is every layer of 4 after-flame wind snout, these after-flame wind snouts are the eddy flow spout, and the burner number of plies of the number of plies and front wall firing and reducing zone is identical or few 1 layer.
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| WO2017212108A1 (en) * | 2016-06-08 | 2017-12-14 | Fortum Oyj | Method of burning fuel and a boiler |
| CN109945168B (en) * | 2019-03-11 | 2019-12-03 | 哈尔滨工业大学 | A kind of W flame boiler of front wall, the rear asymmetrical arrangement of wall lack of gas |
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| CN1584396A (en) * | 2004-06-07 | 2005-02-23 | 上海电力学院 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
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| CN1387006A (en) * | 2001-05-18 | 2002-12-25 | 清华大学 | Method and apparatus for reducing exhaustion of nitrogen oxides from coal-fired boiler |
| CN1584396A (en) * | 2004-06-07 | 2005-02-23 | 上海电力学院 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737771B (en) * | 2009-12-18 | 2012-02-01 | 上海锅炉厂有限公司 | Multistage over fire air distributing mode |
| CN102913898A (en) * | 2012-10-16 | 2013-02-06 | 东方电气集团东方锅炉股份有限公司 | Over-fire air distribution manner in front and back wall opposed firing boiler |
| CN102913898B (en) * | 2012-10-16 | 2015-06-24 | 东方电气集团东方锅炉股份有限公司 | Over-fire air distribution manner in front and back wall opposed firing boiler |
| CN111306533A (en) * | 2019-04-29 | 2020-06-19 | 上海交通大学 | Low NOx control method for staged combustion air depth staged combustion of coal-fired boiler |
| CN111306533B (en) * | 2019-04-29 | 2021-10-01 | 上海交通大学 | Low NOx control method for staged combustion air depth staged combustion of coal-fired boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1807977A (en) | 2006-07-26 |
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