电站锅炉气体不完全燃烧损失对供电煤耗的影响

将燃煤锅炉烟气中的可燃气体简化成CO气体,对中国电站100～1000 MW煤粉锅炉(PCB)和50～300 MW循环流化床锅炉(CFBB)的气体不完全燃烧损失(q3)和由此引起的供电煤耗提高值(Δb)进行了计算。结果表明:当烟气中的CO质量浓度从50 mg/m3增加到400 mg/m3时,随着动力煤干燥无灰基挥发分Vdaf的提高,煤粉锅炉和循环流化床锅炉的q3在0.01%～0.18%之间变化;燃烧褐煤的q3损失最大;PCB和CFBB的q3引起的Δb变化范围为0.03～0.65 g/kWh;相对于PCB,随着Vdaf的提高,CFBB的q3和Δb的波动幅度较小;q3和Δb随着烟气中的CO质量浓度的提高基本上线性提高;PCB和CFBB的q3、Δb随着锅炉蒸汽压力的提高逐步降低。

Effect of combustible gas in flue gas from utility boiler on power supply coal consumption

A variety of combustible gas in flue gas is simplified as CO and calculation of heat loss of combustible gas in utility boiler(q3) and the increasing of power supply coal consumption(Δb) had been made for 100～1000 MW pulverized coal boilers(PCB) and 50～300 MW circulating fluidized bed boilers(CFBB).The results show that when CO concentration ranges from 50 mg/m3 to 400 mg/m3,q3 increase from 0.01 percent to 0.18 percent,which approve maximum value while burning brown coal.Δb for PCB and CFBB increase from 0.03 g/kWh to 0.65 g/kWh.Compared with PCB,Δb and q3 of CFBB fluctuate narrowly by increasing Vdaf.Basically,q3 and Δb improve linearly with the increase of CO concentration in flue gas.The results also show that q3 and Δb reduce with the increase of steam pressure of PCB and CFBB.