In order to study a low-emission landfill gas(LFG) micro gas turbine combustor with central grading lean-burn premixing technology

a single-head combustion chamber was used to test the combustion performance using two LFG and natural gas fuels(LFG1 and LFG2). The ignition characteristics of three kinds of fuels and the effects of main stage nozzle position and fuel classification ratio on pollutant emission and combustion efficiency of the combustor under full load condition are investigated. The test results show that

within the selected air flow range(0.15～0.50 kg/s)

the ratio of ignition fuel to air of natural gas is between 0.000 65 and 0.002 50

and the ratio of ignition fuel to air of the two LFGs is between 0.004 04 and 0.006 20

both meet the design criteria for low pollution combustion chambers. With the fuel grading ratio ranging from 0.2 to 0.5

the three fuels have different fuel distribution ratios

resulting in higher combustion efficiency and lower pollutant emission levels. When the fuel distribution ratio is 0.3 and 0.4

the position of the main combustion stage nozzle is adjusted from the swirler front to the middle position of the swirler

which improves the combustion efficiency of LFG2 and natural gas

but increases the pollutant emission of LFG1 and natural gas.