Turbine cooling and natural gas heating integrated gas turbine system

Abstract

The embodiment of the invention provides a turbine cooling and natural gas heating integrated gas turbine system which comprises a gas turbine system, a turbine cooling and natural gas heating integrated system and a natural gas heat value adjusting system. The other end is communicated with the water inlet end of the TCA system; the TCA system is used for cooling air exhaust of a gas compressor of the gas turbine 2; the water outlet end of the TCA system is communicated with the water inlet end of the FGH system; one end of the low-pressure return water conveying pipeline is connected to the water outlet end of the FGH system, and the other end is communicated with the low-pressure steam pocket; the gas inlet end of the automatic three-way temperature control valve is communicated with a natural gas supply pipeline, and two gas outlet ends are respectively connected with a first conveying pipeline and a second conveying pipeline; the first conveying pipeline is communicated with the air inlet end of the FGH system; the gas outlet end of the FGH system is connected with a third conveying pipeline; and the second conveying pipeline and the third conveying pipeline are converged and then are communicated with a natural gas inlet pipeline.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a gas turbine system integrating turbine cooling and natural gas heating. Background technique [0002] Gas turbine is a kind of equipment that uses high-temperature gas to do work. In order to ensure the safety of gas turbine turbine components, the gas turbine rotor of Mitsubishi Corporation of Japan is cooled by a turbine cooling air system (TCA system), that is, high-pressure feed water is used to cool the compressor pump. The cooling water flow and recovery direction of TCA are controlled through two flow control valves. Since the gas turbine's extraction steam temperature changes from low to high from the initial stage of startup to the rated load, resulting in different requirements for the outlet temperature and flow of the TCA cooling water, the initial stage of startup requires a large flow of low-temperature TCA cooling water. During the load period, TCA cooling ...

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Problems solved by technology

[0004] The TCA system and FGH system in the above-mentioned gas turbines use two sets of systems, one is to use the high-pressure feed water pump to feed water, and the other is to use the medium-pressure feed water pump to feed water, which increases the power consumption of the plant, and both systems are It is more complicated, and the return water needs to be switched back and forth, and when the flow is switched, the flow often fluctuates greatly due to the problem of the flow valve, and even the machine trips

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