煤气锅炉主要运行参数的煤耗偏差分析

Coal consumption deviation analysis of main operation parameters in gas boilers

当锅炉主要运行参数偏离目标值时,会引起锅炉热效率的下降,导致机组发电煤耗升高。为此,分析了煤气锅炉热效率的计算要点,并提出了适用于煤气锅炉的煤耗偏差分析模型,给出了锅炉运行过程中排烟温度、排烟氧量、排烟CO含量变化时的发电煤耗偏差计算模型。实际计算结果表明,该模型能够较准确地计算出锅炉主要运行参数偏离目标值所引起的煤耗偏差,可为机组的优化运行提供数据依据。

If main operation parameters deviate from the target value,the boiler thermal efficiency will de-crease and the unit coal consumption will rise.Thus,the key points in calculating gas boiler thermal effi-ciency was analyzed,and the energy-loss analysis model which is suitable for gas boilers was put forward. Taking a 220 t/h blast furnace gas-fired boiler as the research object,the established model was adopted to calculate the coal consumption deviation resulted from the boiler operation parameters＇variation,like the exhaust temperature,the oxygen content in exhaust,CO concentration in exhaust and so on.The results show this model can obtain the coal consumption deviation accurately,which provides a guidance for boiler optimization operation.