Influence of coal dust on premixed turbulent methane–air flames

This study discusses the design of a new experimental platform, the Hybrid Flame Analyzer (HFA) to measure burning velocity of gas, dust, and hybrid (gas and dust) premixed flames. The HFA is used to analyze a particle–gas–air system of coal dust particles (75–90 μm and 106–120 μm) in a premixed CH4–air (ϕg = 0.8, 1.0 and 1.2) flame. Experimental results show that particles usually increase the turbulent burning velocity. Smaller particle sizes and larger concentrations (>50 g/m3) increase turbulent burning velocity compared with larger particle sizes and lower concentration ranges. The experimental data is used to develop a correlation similar to turbulent gas flames to help modeling of the complex behavior.