Influence of carbon dioxide and steam on temperature field formed by inverse diffusion flame of gasified-gas of woody biomass

Abstract

Partial combustion is applied for tar reduction in the gasified-gas of woody biomass. An inverse diffusion flame was formed in partial-combustion-type gas reformer. Pyrolysis and polymerization of tar occur simultaneously at the vicinity of the combustion reaction zone where exothermic reaction is active. Since soot formation could be a significant problem in the partial-combustion-type gas reformer, it is desirable to suppress soot formation. Temperature is one of the most important properties in the process of reforming tar, and it governs the decomposition of tar and the formation process of soot. In this study, we tried temperature measurement for inverse diffusion flame formed in partial-combustion-type gas reformer by two color pyrometry. A calibration method of two color method using radiation from thermocouple are proposed. Furthermore, the influence of the concentration of carbon dioxide and steam in the oxidizer agent on the temperature field of the inverse diffusion flame are investigated by using the partial combustion gas reformer. The flame structure taking into consideration the flame temperature of the inverse diffusion flame was clarified. Results show that the presence of carbon dioxide and steam in the oxidizer affects the temperature field of inverse diffusion flame. With the concentration of carbon dioxide and steam in the oxidizer increases, the flame temperature decreases. We also find that adding carbon dioxide or steam into the oxidizer affects the accuracy of the temperature result which used two color pyrometry.

Keywords

• two color pyrometer
• gas reforming
• tar
• biomass gasificasion
• inverse diffusion flame
• soot
• temperature