The Effect of the formation of key components on the laminar combustion rate of ammonia/methanol mixture combustion under medium-pressure gas turbine related working conditions

Abstract

In recent years, green ammonia and green methanol have gained widespread attention as important hydrogen carriers. However, ammonia has a slow laminar flame speed, and the addition of methanol can improve this characteristic. This has sparked interest in the study of ammonia/methanol co-combustion. This paper first investigates the relationship between the methanol addition ratio, temperature, and the laminar flame speed of ammonia. Through MATLAB simulations, the study further examines the key species involved in the combustion process. The results indicate that the laminar flame speed is linearly related to the maximum concentration of (O+H+NH₂). Following this, the yields and sensitivity analysis of the three radicals (O, H, and NH₂) were performed. It was found that these three radicals have a positive correlation with both temperature and methanol content, with temperature and methanol primarily influencing the content of H radicals, which in turn affects O and NH₂. Finally, using the modified fictitious diluent gas approach, it was concluded that the chemical properties of methanol are the main factor promoting ammonia oxidation. Keywork: laminar combustion velocity; free radical concentration; thermal effect; numerical simulation