火力发电厂配煤掺烧的燃煤成本模型

Model of Coal Cost for Blending Coal Combustion in Thermal Power Plant

燃煤成本是火力发电厂最主要的运行成本。为综合反映机组能效和煤炭市场价格对燃煤成本的影响,提出了入炉煤标单价差临界值的概念。从燃煤成本最低的原则出发,建立了入炉煤标单价差临界值的具体计算模型,可以基于燃煤差价判断配煤掺烧是否能够降低燃煤成本,并直接从燃煤差价出发优选掺烧比。该模型有助于避免"只要掺烧便宜煤就能降低燃煤成本"和"便宜煤掺得越多,经济效益越大"的认识误区,适用于辅助火力发电厂燃煤采购决策和配煤技术管理。

Coal cost is the largest part of thermal power plant running cost.A model of critical values of standard coal as fired price deviation(CVSCPD)is built,according to the coal cost minimization principle.This model comprehensively expresses how the unit power efficiency and coal prices influence coal cost.Two questions are answered by CVSCPD respectively,whether blending coal is effective to save coal cost,and which blending rate is the best.It helps to correct two mistakes of coal blending in commonsense.One mistake is that blending cheaper coal always helps reducing coal cost.The other is that the more we blend cheaper coal,the more we earn.It is quite applicable to the decision making of coal purchase and the process management of coal blending.This work is supported by AQSIQ Technology Project(No.2017QK178).