Fuel purging equipment of double-fuel gas turbine

Abstract

The invention discloses fuel purging equipment of a double-fuel gas turbine. The fuel purging equipment comprises a nitrogen displacement and storage bypass and two fuel system purging bypasses. The nitrogen and displacement storage bypass is used for converting liquid nitrogen into nitrogen and storing the nitrogen through storage equipment. One ends of the two fuel system purging bypasses both are connected with the storage equipment, and the other ends of the two fuel system purging bypasses communicate with a liquid fuel system and a gas fuel system of the gas turbine correspondingly. Under the condition that a gas compressor gas inducing structure is not extra added, the equipment can supply inert gas, preferably the nitrogen, with certain pressure and flow in the process of fuel switching of the gas turbine, it is guaranteed that fuel and air are effectively isolated, carbon deposition of liquid fuel in a channel and detonation of gas fuel are prevented, and steady switching is achieved.

Description

technical field [0001] The invention belongs to the field of gas turbine design, and in particular relates to fuel cleaning equipment for a dual-fuel gas turbine. Background technique [0002] At present, the vast majority of industrial dual-fuel gas turbines in the world use gaseous fuel or liquid fuel to push the turbine to achieve expansion and work. Correspondingly, these gas turbines should have two kinds of fuel supply systems of gaseous fuel and liquid fuel. Usually, the two fuels are not used at the same time. When the gas turbine is used for natural gas, the supply of liquid fuel is stopped. Conversely, when the gas turbine is used for liquid fuel, the supply of gaseous fuel is stopped. [0003] In the process of switching from liquid fuel to gaseous fuel, carbon deposition is prone to occur, and carbon-containing precipitates and carbon deposits in the form of particulates are generated in the liquid fuel system. Generally, carbon-containing precipitates and carb...

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Problems solved by technology

[0004] In addition, in the process of switching from gaseous fuel to liquid fuel, deflagration is very easy to occur. How to ensure that the gaseous fuel is effectively isolated and prevent gaseous fuel from deflagration has become a practical problem that technicians must solve

[0005] In the prior art, most of the domestic industrial dual-fuel gas turbines use the air flow from the compressor to clear the raw fuel passage during the fuel switching process. In this way, on the one hand, the gas turbine needs to design a corresponding compressor The bleed chamber, bleed valve and bleed valve control system increase the complexity of the compressor structure

During the peak shaving period of the two-shift unit, the gas turbine starts and stops frequently, and the bleed air valve moves frequently. Once the valve body jams and deteriorates or the cylinder fails, it will directly lead to the failure of the cleaning and blowing system to be put in or out, and will directly trip the machine in serious cases; On the one hand, in order to accurately and timely judge the deterioration tendency of the valve, it is necessary to stop the machine and carry out regular transmission and adjustment tests on the bleed valve, and it is obviously not easy to do it during the peak shaving period of the two-shift unit

In addition, since the purge air flow is air, although the purge time is extremely short during the fuel switching process, there is still a certain probability of carbon deposition in the liquid fuel channel and deflagration of the gas fuel theoretically.

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