煤质多变下火电厂最经济煤种决策

Decision of the Most Economic Coal in Power Plant With Coal Quality Variation

我国火电厂大多无法燃烧设计煤种,煤质变差、煤价高涨和锅炉磨损爆管事故频发。为定量得到煤质变差后给火电厂带来的综合经济损失的计算模型,在某电厂进行了煤种变化对全厂经济性影响的试验研究。试验结果表明:设备维修费用、助燃油量、爆管泄漏的频率均与灰分呈指数关系变化;综合考虑标煤单价、设备维护费用、排放成本等各项因素,找到该厂当前最经济煤种,煤质参数介于设计煤种和劣质煤之间;并提出煤价波动体系下一种快捷的求取火电厂最经济煤种的计算方法。

It is impossible for most of the coal-burning power plant to burn the designed coal, the coal quality gets inferior, the coal price is soaring and tube explosion accidents occur frequently. In order to get the mathematic model of the comprehensive economic loss, the experiment was done at a power plant to investigate the impact of the variation of the coal on the economy of the entire plant. The results show that the equipment maintenance cost, combustion-supporting oil quantity, and frequency of tube explosion are changed with the ash content exponentially. With the consideration of the price of the standard coal, equipment maintenance cost, discharge cost, et ,al. the most economical coal for the plant is found out, whose quality parameters are between the designed coal and poor-qaulity coal. A method for calculating the most economical coal under a system where the coal price is fluctuating was also presented.