Cooling method of turbine rotor of combustion gas turbine and cooling gas system

Abstract

The invention discloses a cooling method of a turbine rotor of a combustion gas turbine and a cooling gas system. A gas pumping pipeline is connected between a gas compressor and a turbine, wherein agas pumping adjusting valve is arranged on the gas pumping pipeline; a temperature measuring device and a pressure measuring device are arranged at different points on the combustion gas turbine and are connected to a control system through signal circuits; the temperature measuring device and the pressure measuring device are used for transmitting detecting signals to the control system through the signal circuits; the control system is used for controlling the gas pumping adjusting valve and a water supplying adjusting valve to adjust to reach the temperature and flow rate required by gas tocool a turbine blade of the combustion gas turbine and a wheel disc; a water cooling temperature conditioning device for cooling gas is arranged between the gas compressor and the gas pumping adjusting valve on a gas pumping pipeline; the temperature T2 of cooling gas exhausted through the temperature conditioning device and fed into the turbine can be determined based on the gas temperature forcooling the turbine blade of the combustion gas turbine and the wheel disc; and the water inlet flow rate m1 of the temperature conditioning device is adjusted to control the temperature T2 of the cooling gas exhausted by the temperature conditioning device. The method and the system reach the best cooling effect with the least cooling gas volume.

Description

technical field [0001] The invention relates to the field of gas turbines, in particular to a method for cooling a turbine rotor of a gas turbine and a cooling gas system. Background technique [0002] The turbine vanes, moving blades and discs in the hot passage of the gas turbine are in a high-temperature environment. Due to the limitation of materials, they need to be cooled by cooling gas to ensure reliable operation and ensure the necessary life. Typically, the compressor exhaust (extraction air) is directed into the turbine for cooling. Under the full-load condition of the gas turbine, the temperature of the compressor exhaust (exhaust air) is relatively high, which is directly used to cool the hot passage components of the turbine, and the required flow rate is relatively large. Excessive extraction air flow rate will affect the efficiency of the unit. [0003] In addition, due to the fact that the disc clearance does not change linearly during the change of the hot ...

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Problems solved by technology

[0004] The present invention aims at the above problems, in order to solve the shortcomings of the existing turbine rotor cooling gas system that the energy is not fully utilized and the amount of cooling gas cannot be adjusted, the present invention provides a new gas turbine rotor cooling method and cooling gas system , this method can not only cool the compressor exhaust (air extraction), make full use of the heat released by the compressor exhaust (air extraction), but also adjust the amount of air extraction, and control the cooling gas entering the turbine according to the operating conditions of the gas turbine In addition, it can make full use of the exhaust heat of the compressor to improve the performance of the gas-steam combined cycle

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