Emissions in combustion of lean methane-air and biomass-air mixtures supported by primary hot burned gas in a multi-stage gas turbine combustor

摘要: Abstract Thermal reaction of lean to ultra-lean premixed mixtures supported by the hot burned gas from up-stream stage can be used for obtaining a better trade-off between ultra-low-NO x and high combustion efficiency over wide range operations turbine. A three-stage model combustor designed based on this concept is being developed biomass gas-fueled regenerative cycle 10 kW micro-gas Tubular flame primary compositions are injected into cross-flowing in secondary tertiary stages. The emissions characteristics evaluated with methane simulated different CO 2 contents at atmospheric pressure inlet air temperatures up 700 K. In experiments, fuel flow mixture was gradually increased while maintaining two-stage mode flows stages mode. exit NO concentration corrected 15% O remained or slightly lower than level that achieved start staging as far leaner 10 ppm were less 1700 K. contrast, increase steeply equivalence ratio non-staged completion when zone temperature higher 1500 K regardless stage. results show that, multi-stage where low-NO overall ratios temperatures. It found suppresses formation slowing down progress reaction, especially conditions.