When natural gas is converted to hydrogen doping natural gas,CO2 emissions can be effectively reduced.This requires the necessary retrofitting of gas stoves in residential homes,and the lowest possible retrofitting cost is one of the key issues in the implementation of hydrogen doping natural gas.Therefore,this paper investigates the retrofit measures required for the structure of natural gas-finished gas stoves under 20％-30％ hydrogen-doped natural gas conditions.It is found that:the pilot tube structure of the gas stove does not need to be modified,the diameter of the nozzle needs to be increased to maintain the heat load,the diameter of the burner hole of need to be reduced from the original 2.6-2.7 mm to 1.8-2.0 mm in order to ensure the stability of the combustion,and the heat intensity of burner hole has a significant impact on the combustion performance of the stove.Under the 20％ hydrogen doping condition,the gas can be stably combusted with a thermal efficiency of 68.8％ and a flue gas level of 150 ppm or less when the heat intensity of the outer ring of burner holes is within the range of(7.9-9.1)×10-3kW·mm-2 and that of the inner ring of burner holes is within the range of(10.9-12.4)×10-3 kW·mm-2.The optimal combustion performance was obtained at a hydrogen doping ratio of 30％,heat intensities of 9.06×10-3 kW·mm-2 and 12.4×10-3 kW·mm-2 for the outer and inner ring flare holes,respectively,and the large burner hole diameter of 1.8 mm:a thermal efficiency of 69.5％,a flue gas value of 77.9 ppm and a heat load deviation of 0.25％.
domestic gas stovedesign parametershydrogen doping ratioheat intensity of burner hole
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