Abstract:Power supply coal consumption is a total index of generating equipment in thermal power plant and system operation performance, which reflects the overall operation level of power plants.This paper conducted a regression analysis on the large number of historical data of a certain power plant, and discovered that there exists a non linear relationship,which carries an obvious inflection point of coal consumption,between the unit load rate and the power supply coal consumption.After that,the inflection point characteristic of single unit coal consumption was confirmed by experiment. At last,this paper analyzed the influences of turbine heat rate,boiler thermal efficiency,auxiliary power ratio and external factors to the power supply coal consumption, and it provided technical support to thermal power plants to making the maintenance plan,generating capacity schedule and distributing the power load,etc

Keywords:thermal power plant, power supply coal consumption, inflection point, turbine heat rate, boiler thermal efficiency, auxiliary power ratio