Abstract: Reducing power consumption rate is effective way to increase the system efficiency of thermal power generating units, in currently, people often using a small turbine to drive feed water pump or fan to reduce the power consumption rate or using converter technique. A new technology program is proposed in order to reduce the power consumption rate, by transplanting turbofan engine technology to power plant, through using the high temperature heat exchanger replaced the combustion chamber of gas turbine to heat high-pressure air flowed from the compressor, so the high temperature and pressure air flowing into turbine and then discharging to boiler after expensing and working in turbine. In addition to drive the compressor, turbine generating surplus power can be used to replace part of the auxiliary power or drive electrical equipments. The computational model of the performance of the technology program was established and the calculation results show that when the temperature of the air at the inlet of the turbine is 700 ℃, at the condition of the boiler without increasing the exhaust gas temperature, in addition to providing the boiler wind power consumption, air turbine system can also generating more than 9 MW of electrical power, conversion decreased plant electricity rate about 3% for the 600 MW thermal power unit. The effect of reducing power consumption rate through air system and small steam turbine are compared and the results show that the new technology program better than using a small turbine to reduce the auxiliary power mode.

Key words: Air turbine, Power consumption rate, Thermal power unit, Turbofan engine