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  影响蒸汽锅炉的燃烧状态有哪些?  
 
Influence of steam boiler combustion state have?
影响蒸汽锅炉的燃烧状态有哪些?
(1) poor combustion state.
(1) 蒸汽锅炉燃烧状态不佳。
Is a grate length is insufficient, shorten the retention time on coal burning in the grate, especially in the increase of coal seam thickness, grate stroke, grate drive frequency constant, which is not fully burning coal, slag containing large amounts of combustible qualitative, increased the mechanical incomplete combustion heat loss.
一是炉排长度不够,缩短了燃煤在炉排上停留时间,特别是在增加煤层厚度时,炉排行程、炉排推动频率不变,致使煤不能充分燃烧,炉渣中含有大量可燃质,增加了机械不完全燃烧热损失。
Before and after the second is arch structure is unreasonable, reach the best state. Arch mismatch, before and after the high temperature flue gas of burning area, be directed effect is not obvious, arch cannot ensure furnace with high temperature, primary zone without proper heat, coal combustion opaque; At the same time after the arch cover fire grate area is larger, the arch structure makes high temperature flue gas flow is blocked, weaken the disturbance, shorten the flue gas flow, at the same time cause the throat not combustion in high temperature flue gas and air mixture, increased chemical combustion loss.
二是前后拱结构不合理,燃烧达不到最佳状态。前后拱配合不当,燃尽区的高温烟气,被引导作用不明显,拱不能保证蒸汽锅炉炉膛有较高温度,主燃区得不到应有的热量,煤燃不透;同时后拱覆盖炉排面积较大,拱型结构使高温烟气流动受阻,削弱了扰动,缩短烟气流程,同时造成喉部高温烟气中未燃物与空气混合不良,增加了化学燃烧损失。
Three is equipped with fan and air distribution. This furnace according to grate length direction set three wind chamber air distribution, cannot effectively adjust along the best air volume on the length of the grate. When coal and air supply fails to reach the design value before occurrence of positive pressure combustion chamber of a stove or furnace, affect the combustion condition, reduces the design efficiency.
三是风机配备及配风不当。该炉按炉排长度方向设置三个风室进行配风,不能有效调节沿炉排长度上相应位置最佳风量。当给煤和送风未达到设计值之前出现炉膛正压燃烧,影响燃烧状况,降低了设计燃烧效率。
(2) the quantity of coal can not meet the design requirements.
(2)燃煤量达不到设计要求。
It is a grate area is small. The width of the grate cannot make fuel per unit time into the grate, under the design parameters required in coal consumption, namely the boiler heat and high temperature smoke gas output requirements and design the enough, the result must be pressure, evaporation deviates from the value of the design.
一是炉排面积小。蒸汽锅炉排宽度不能使单位时间内进入炉排的燃料达到该设计参数下所需的耗煤量,即锅炉产生热量和高温烟气量与设计出力要求的远远不足,其结果必然是压力、蒸发量偏离设计值。
Second, the reciprocating horizontal pushing grate restricted coal seam thickness. Because of the fire grate narrower, reduce the coal consumption accordingly, in order to increase the amount of coal, only increased thickness of coal seam in the grate. As reciprocating horizontal pushing grate, no natural falling trend of coal on the fire grate, powered by backward link cock only make coal burning in the grate, too thick coal seam, however, grate piece of coal, especially in excess of the prescribed role in promoting the thickness of coal seam is abate, when activities grate withdraw, just pushing coal back to back, it will make the coal seam backward movement stagnation, and slag and coal mixing drum, can't timely pushing coal slag into the pit, serious when, can make the coal and slag with arch, destroyed the layer combustion state, affect the normal operation.

二是往复平推炉排煤层厚度受限制。由于炉排较窄,相应减小了煤耗,为了增加燃煤量,只有增加炉排上煤层厚度。由于是往复平推炉排,煤在炉排上无自然下落趋势,只靠炉排片翘起向后推动使煤在炉排上燃烧,然而煤层过厚,炉排片对煤,特别是超过规定厚度煤层推动作用减弱,当活动炉排抽回时,又将刚向后推动的煤带回,使煤层向后运动产生停滞,以至煤及渣混合起鼓,不能及时将煤渣推入渣坑,严重时,可使燃煤及渣顶着后拱,破坏了层燃状态,影响正常运行。 

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