METHOD OF CONTACT GAS TURBINE PLANT OPERATION ON METHANE-HYDROGEN STEAM-GAS MIXTURE Russian patent published in 2022 - IPC F02C3/28 

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering, in particular to contact power gas turbine plants. Method of operation of a contact gas turbine plant on a methane-hydrogen steam-gas mixture is that compressed in a compressor air and a methane-containing steam-gas mixture are supplied to its combustion chamber, combustion products are expanded in gas turbine, their heat is used for generation of superheated steam of high pressure. Condensing low pressure steam contained in cooled combustion products, steam condensate is used to generate superheated high pressure steam, most of this steam is supplied to combustion chamber, and its smaller part is mixed with natural gas from the main gas pipeline. Obtained gas-steam mixture is heated by the heat of the combustion products expanded in the gas turbine to temperature of 500–550 °C and fed into combustion chamber. Smaller portion of the superheated steam and natural gas is mixed at a weight ratio of 7:1 and pressure of 2.5–3 MPa. Compressed air is supplied to the first stage of the combustion chamber - the pre-chamber, natural gas is supplied to the gas burner of the pre-chamber, into its cooling jacket containing the nickel catalyst capsules, gas-steam mixture is fed, heated to 620–680 °C using heat of cooling jacket, steam catalytic conversion of gas-steam mixture is carried out on catalyst contained in it with formation of methane-hydrogen mixture containing up to 5 % of hydrogen. Obtained methane-hydrogen mixture is fed into prechamber, this mixture is successively mixed with compressed air and with combustion products of gas burner, obtained "rich" methane-hydrogen mixture is fed into prechamber, it is successively mixed with compressed air and with combustion products of gas burner and burnt with excess air factor of 0.6–0.7, at that, due to high-temperature steam conversion of methane, hydrogen fraction is increased in combustion products to 15–20 %, combustion products temperature is set at level of 1300–1350 °C, then compressed air is supplied to them and "lean" fuel-air mixture is obtained, which is burnt in afterburning chamber, temperature of combustion products is increased to 1950–2000 °C, then compressed air and superheated steam are fed therein to set the required gas temperature ahead of the gas turbine.

EFFECT: invention increases reliability and reduces the cost of the gas turbine plant.

1 cl, 2 dwg