基于改进单耗理论的火电机组能耗基准状态精细表征

Detailed Mechanism of Energy-consumption Benchmark in Coal-fired Units Based on Improved Fuel Specific Consumption Theory

研究了大型火电机组的能耗基准状态表征方法,在传统单一参数或局部系统基准值的基础上,递进式研究从参数、设备、子系统到机组等多个层面下的能耗作用规律,探索"能耗基准状态"的精细表征方法。以机组单耗为优化目标构建能耗基准状态表征模型,并应用于某1 000 MW超超临界机组中。结果表明,机组设备的设备因素附加单耗占主要部分,相比于实际状态,能耗基准状态下设备系统因素附加单耗会降低,且降低量与机组能耗随着负荷的降低而增加,火电机组的能耗基准状态与设备特性、边界条件、运行工况和操作水平密切相关。

Based on the traditional benchmark values which usually concerning about single parameter or local system, the expression of energy-consumption benchmark states is analyzed in this paper. To discover an elaborate description of energy-consumption benchmark states, the rule of energy consumption interactions is studied in four parts： parameters, equipment, subsystems and units. With the fuel specific consumption setting as the optimization objective, a model for energy-consumption benchmark states was established and performed on a 1 000 MW supercritical power unit. The results show that the system additional specific consumption （ASFC） acounts for the major of the ASFC of a component; compared to the real state, the system ASFC under benchmark state decreases, and the reduction values and energy consumption increases with the decrease of load. The energy consumption benchmark state is related with the varying boundary, can reflect the boundary condition, operation lever and equipment performance in a regular way.