Effects of porous insertion in a round-jet burner on flame characteristics of turbulent non-premixed syngas combustion

Abstract

Synthesis gas (Syngas) is a gaseous mixture that consists of 3 species. It is used in creating synthetic natural gas. In this work, the turbulent non-premixed flame of syngas-air combustion in a round-jet burner is numerically investigated. The burner is partially filled with porous material. Syngas stream fed by high-speed jet entrains co-flow air causing reaction in a non-premixed manner. Turbulent flame is generated over the free-space and porous zones, where the coupled energy and species transports are computed. The k−ω model is used turbulent reaction are modeled using the eddy dissipation concept. Effects of porous material in the burner are analyzed. It was found that porosity and porous thickness have significant effects on flame and heating characteristics. Flame gets broadest at an intermediate value of porosity. The present investigations can be practically applied for the area of low and medium process temperatures such as in glass manufacturing which would enable combustion with low emission rates, reduced energy consumption and quality improvements due to improved controllability. Keywords: Non-premixed, Turbulent flame, Round-jet burner, Syngas, Porous insert, Numerical model