Abstract
Taking an ultra-supercritical double-reheat 1000 MW steam turbine as an example, the influence rule of the ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder and low pressure cylinder on coal consumption of steam turbine under THA, 75%THA, 50%THA and 40%THA is analyzed. According to the data of cylinder efficiency on the heat consumption rate of steam turbine, combined with the design of the efficiency of the boiler and plant electricity rate, it is worth to work out the influence rule of cylinder efficiency on the power generation coal consumption and power supply coal consumption under THA condition. The conclusion shows that the influence of cylinder efficiency on coal consumption is basically linear. The efficiency of low pressure cylinder is the most sensitive, the efficiency of intermediate pressure cylinder is second, the efficiency of high pressure cylinder and ultra-high pressure cylinder has little effect on coal consumption. The conclusion can provide technical reference for energy-conservation diagnosis and management on the ultra-supercritical double-reheat 1000 MW steam turbine.
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