More than 95% of domestic thermal power plants convert coal into electricity. It is very necessary to analyze the factors that affect coal consumption during the operation of thermal power plants. Factors that affect coal consumption come from: Steam. operation of turbine and boiler, etc. Steam parameters, pot combustion efficiency, condenser vacuum, low level thermal energy of fuel, etc.
The specific influencing factors and technical descriptions are as follows:
First: the unit load rate and on-off factors of the unit. The unit load rate is a direct influencing factor on the unit's coal consumption for electricity generation. When the unit load rate decreases, the operating efficiency of the boiler decreases, the thermal efficiency increases, the power consumption rate of the power plantincreases and the consumption of coal for electricity production. electricity production increases. For every 10% change in unit load rate, coal consumption for electricity generation will change by 3 to 6 g/(kW·h).
Second: the influence of the main steam parameters. (1) Influence of the main steam temperature. (2) Influence of the main vapor pressure. (3) Influence of reheating steam parameters.
Third: coal ash. For every 1% increase in coal ash content, coal consumption for power supply increases by 0.03 to 0.04 g/(kW·h).
Fourth: the influence of oxygen. Generally speaking, every time the air leakage coefficient of the furnace increases from 0.1 to 0.2, the exhaust gas temperature will increase by 3°C to 8°C and the efficiency of the boiler will decrease by 0.2% to 0.5%. Therefore, the coefficientAir leakage should be reduced as much as possible.
Fifth: the impact of the factory's electricity consumption rate. Although the power consumption rate of the plant does not affect the consumption of coal for electricity generation, it is directly related to the consumption of coal for power supply of thermal power plants. The lower the power consumption rate of the plant, the lower the coal consumption of the plant. Power source. For every 0.5% reduction in the power consumption rate of the plant, coal consumption for power supply will be reduced by 2 to 2.5 g/(kW·h).
Factors such as the operating load rate of the unit and the accuracy of raw coal consumption measurement affect the standard indicator of coal consumption rate for power supply thermal power plants. The coal consumption rate forElectricity production is a factor. important economic indicator for thermal power plants.