摘要
介绍了一种新型自动可调式煤粉分配装置 ,重点说明了它的稳燃原理及其在风扇磨煤机直吹式制粉系统中的应用情况。通过大量的工业试验 ,对自动可调式煤粉分配器的风量、煤粉量的调整特性进行了研究。结果表明 :新型自动可调叶栅煤粉分配器应用于国产 670 t/h褐煤锅炉中 ,能在运行中对空气和煤粉分配进行调节 ,实现了风粉分配由不可控制到有效控制 ,使锅炉的低负荷不投油稳燃能力由原来 70 %降低到4 5 % ,达到了大幅度降负荷运行的目的 ,并且由于燃料在炉内燃烧被分为过浓燃烧和过淡燃烧两部分 ,使NOx排放量低于 4 69mg/m3,机械不完全燃烧损失降低了 1 .95 8% ,有效地提高了锅炉机组的热效率和低负荷运行的能力。图 9表 3参
With the increasing tasks of load down operation of the power station units in China, the capacity of the boiler's low load stable burning is more necessary. This paper proposes a new type automatic adjustable pulverized coal distributor (AAPCD) and mainly introduces the stable burning principle of this distributor and it's application in the direct fired system in boilers with fan mills. The dependence of the characters of the automatic adjustable pulverized coal distributor on the air and coal powder flows by means of a lot of commercial tests. The results show: being applied in domestic lignite boiler of 670t/h, this AAPCD can adjust the distribution of the air and coal powder when the boiler is running; achieve effective control of distribution of them, increasing the capacity of the boiler's low load stable burning without oil which usually used in China while the boiler works in a low load condition from 70% down to 45%, so we can lower the load greatly. Because the combustion of the fuel is divided into two parts over dense combustion and over sparse combustion in boiler, the emisson of NOx is less than 350mg/kg, the unburned carbon loss is decreased by 1.958%, so it effectively increases the thermal efficiency and improves the capacity of low operation. Figs 9, tables 3 and refs 2.
出处
《动力工程》
CSCD
北大核心
2001年第5期1444-1449,共6页
Power Engineering
