METHOD FOR PRODUCING HYDROGEN-CONTAINING FUEL GAS WITH ELECTRICAL PLASMA-CHEMICAL AND HIGH-TEMPERATURE METHANE CONVERSION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC C01B3/02 C01B3/24 B01J19/08 F02C3/28 

FIELD: chemical industry.

SUBSTANCE: invention relates to a method for producing hydrogen-containing fuel gas with electrical plasma-chemical and high-temperature methane conversion, which is implemented in three stages. At the first stage, natural gas with the pressure of 2.5-3 MPa is heated with the heat of the exhaust gases of a gas turbine to 400–450°C is converted in a high voltage corona electric discharge of 20–40 kV to produce synthesis gas. At the second stage of the method, a smaller part of the air compressed in the compressor is supplied to the first stage of the combustion chamber - the prechamber of the gas turbine unit, synthesis gas and natural gas are supplied to the burners of the prechamber, the resulting “rich” methane-hydrogen-air fuel mixture is ignited and its incomplete combustion occurs with the excess air coefficient of 0.6–0.7, the temperature of the combustion products leaving the prechamber is increased to 1350-1400°C, with thermal conversion of methane and increased proportion of hydrogen in combustion products to 5–7%. At the third stage of the method, combustion products from the prechamber and most of the air compressed in the compressor are supplied to the second stage of the combustion chamber - the afterburner chamber, the resulting methane-hydrogen-air mixture is burned in the afterburner chamber at an excess air ratio of 1.3-1.5, increase the temperature of the combustion products of the mixture to 1950-2000°C and increase the proportion of hydrogen in combustion products to 20% due to high-temperature thermal conversion of methane. Diluting compressed air is supplied to the combustion products leaving the afterburning chamber and the required gas temperature is set in front of the gas turbine. Using the control system, the flow of compressed air supplied to the pre-chamber, the flow of synthesis gas and natural gas supplied to its burners, the flow of compressed air supplied to the afterburning chamber and to the combustion products are regulated. The invention also concerns a device for implementing the method.

EFFECT: increase in hydrogen content in the fuel gas, increased efficiency and improved environmental friendliness of gas turbine units.

2 cl, 2 dwg