The insufficient output capacity of one 330 MW turbo-generator set had been caused by defects of the main auxiliary machines

an operation mode of throttling extracted steam from the high-pressure heaters being adopted for increasing output capacity

so as to meet the requirement of the unit's output.The variation in economic indices of the unit in practical manipulation process of throttling the extracted steam from high-pressure heaters has been calculated and analysed.Results show that the said operation mode can stop all the extracted steam from high-pressure heaters at the same time of increasing output capacity of the unit

making the standard coal consumption rate to raise 9.88 g/(kW·h)

having poor practical economic efficiency.