Effect of H2 and CO in syngas on oxy-MILD combustion

This paper investigates the effect of adding H-2 and CO to a syngas on oxy-MILD combustion. This work employs a Perfectly Stirred Reactor (PSR) model to calculate the autoignition temperature and the critical oxygen concentration for different component fuels under oxy-MILD conditions. Our investigation obtains the critical O-2 concentration for oxy-MILD combustion of various H-2/CO/CH4 component fuels. The results indicate that adding H-2 to CH4 significantly reduces the minimum O-2 concentration required for achieving the MILD state while adding CO has little effect. Furthermore, using the novel PCA method, we analyze characteristic chemical time scales for oxy-MILD combustion for different fuel ratios. We conclude that the mixture containing H-2 and CO can be used as fuel for oxy-MILD combustion, as its characteristic chemical time scale is comparable to the turbulent time scale, resulting in Da number close to unity. However, achieving a steady MILD combustion state is more challenging than methane due to reduced ignition delay times. Moreover, syngas with various ratios of H-2/CO presents the potential for controlling the MILD combustion process.

Automated summary

This paper investigates the effect of adding H-2 and CO to a syngas on oxy-MILD combustion. The results indicate that adding H-2 significantly reduces the minimum O-2 concentration required for achieving the MILD state while adding CO has little effect. Furthermore, the mixture containing H-2 and CO can be used as fuel for oxy-MILD combustion with a characteristic chemical time scale comparable to the turbulent time scale.