Method for raising cyclic thermal performance of gas turbine based on combustion-reforming of methane

Abstract

The invention discloses a method for raising cyclic thermal performance of a gas turbine based on combustion-reforming of methane, which comprises the following steps:1) air pressurized by a compressor in the gas turbine and a portion of fuel flow are introduced into a gas-turbine combustion chamber for combusting, high temperature flue gas containing H2O and CO2 are obtained; 2)then a portion of fuel flow and the generated H2O and CO2 is performed a reforming reaction with heat absorption on a catalyst surface, a mixed combustion gas is obtained; 3) the mixed combustion gas is introduced into the gas turbine for a turbo expanding work. According to the invention, a methane reforming reaction with heat absorption is used for absorbing high temperature heat released by combustion of methane, the cyclic thermal performance of the gas turbine can be improved. The mixed combustion gas through the reforming reaction is input into the gas turbine for realizing an expansion work, which has high heat efficiency. Compared with a simple cyclic gas turbine in the present art, the circulating thermal efficiency can be raised about 25%, simultaneously the specific work of combustion gas cycle is improved so that the whole design for the structure of gas turbine is more compactable under the same power.

Description

technical field [0001] The invention relates to a method for improving cycle thermal efficiency, in particular to a method for improving gas turbine cycle thermal performance based on methane combustion-reforming. Background technique [0002] In the prior art, the gas turbine cycle directly combusts fuel and compressed air in the combustor. Due to the limited flue gas temperature that gas turbine metal materials can withstand at high pressure, the high-temperature flue gas after combustion needs an excessive amount of "secondary air" for cooling to reduce the flue gas temperature and meet the temperature requirements of the turbine metal materials , and finally the cooled flue gas is input into the turbine of the gas turbine to expand and do work. [0003] The above-mentioned gas turbine cycle mainly has the following disadvantages: 1. After the combustion reaction of the gas turbine combustion chamber, the "secondary air" needs to be cooled to reduce the temperature of th...

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Problems solved by technology

[0003] The above-mentioned gas turbine cycle mainly has the following disadvantages: 1. After the combustion reaction of the gas turbine combustion chamber, the "secondary air" needs to be cooled to reduce the temperature of the flue gas to meet the requirements of the turbine; 2. The compressor compresses a large amount of "secondary air". The consumption of the shaft work output by the gas turbine significantly reduces the net work output of the cycle, which reduces the thermal efficiency of the gas cycle; 3. The air required for the cycle is excessive, and the heat loss of the gas turbine exhaust increases, resulting in a relatively low thermal efficiency of the cycle ; 4. Excessive air at the same time makes the NOx emission concentration of the gas cycle higher

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