在火电机组的发电成本中，燃煤所占的比重最大。传统的入炉煤计量方法，通过皮带称只能计量出几台机组入炉煤的总量，无法准确地计量单台机组的入炉煤量和机组的发电成本。目前火电厂普遍采用正平衡方法，即根据入炉煤计量煤量和入炉煤机械取样分析的低位发热量计算发供电煤耗。在分析了整个入炉煤计量系统和输煤程控系统的基础上，设计了针对2×1000 MW火电机组的入炉煤的计量程序，实现了入炉煤的分仓计量。实践应用表明，此程序所计量的日加仓总煤量与皮带秤计量的日加仓总煤量之间的误差控制在±0.01%之内，实现了入炉煤量的精确计量。%In costs of fossil-fired power generation units, the coal consumption has the largest share. The traditional coal metering for entering furnace can only meter the total coal of several units, it is impossible to give the coal consumption and the cost of single unit. At present, it is common that the positive balance method is used, i. e. , coal consumption is calculated in accordance with the coal metered entering the furnace and its low calorific value of the mechanical sampling analysis. On the basis of analyzing coal entering furnace metering and the programming control system of the coal handling system, the metering program for 2×1 000 MW fossil fired power units is designed to implement individual warehouse metering. The practice indicates that the error between the metering by the program and the amount measured by conveyor scale is ±0. 01%, the precise metering is implemented.
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