Combustion Performance Of Low Emission Combustor For Biomass Gas Micro Turbine

In recent years,in the research and development of micro-turbine combustion chambers,under the premise of ensuring the performance of gas turbines,low-emission technology has become the most important.Biomass gas is a kind of combustible gas with flammable composition and calorific value different from natural gas.Its combustion characteristics are quite different from natural gas.The low-emission micro gas turbine combustion chamber designed for natural gas is not suitable for biomass gas.In order to study the combustion and emission characteristics of low-emissions micro-turbine combustion chambers for postgraduates,this paper conducts experimental and numerical simulation research on the combustion performance of a low-emission combustion chamber designed for biomass gas.In experimental studies,tests has been performed on the combustion characteristics using different biomass gases.The influences of air distribution method,fuel nozzle combination method and fuel composition on the combustion efficiency,total pressure recovery coefficient and pollutant emission of the combustion chamber has been analyzed.The experimental results show that the fuel distribution ratio of the duty class to the main combustion level has an effect on the combustion performance.When the fuel ratio is 0.375,the emissions of NOx and CO are 10.47 ppm and 10.94 ppm,the fuel efficiency is above 99%,As a result,the requirements for the emission of pollutants from the combustion chamber were met.The numerical calculation model of the combustion chamber was established.The combustion characteristics in the experimental state were calculated and compared with the experimental results.After confirming the credibility of the mathematical model adopted,the parameters affecting the ignition performance of the combustion chamber(ignition temperature,Fire core radius,ignition position,etc.)were numerically calculated.The calculation results show that: within a suitable range of oil-gas ratio,increasing the ignition temperature from 1000 K to 2500 K can provide more ignition energy to ignite the fuel-air mixture,and it is easier to ignite the surrounding area,and the faster the flame spreads;The axial distance of the ignition position is too long,and the ignition of the fuel at the fuel outlet can be difficult.When the axial distance is greater than 0.085 m,the energy required to ignite the initial flame will increase significantly,and the flame propagation speed will decrease rapidly;the larger the radius of the ignition core,the more energy can be used to ignite the fuel,which will cause The flame spreads faster,the ignition time is shorter,and the ignition performance is better.