Experimental and numerical study on adiabatic laminar burning velocity and overall activation energy of biomass gasified gas

Abstract

The adiabatic laminar burning velocity (SL,0) and overall activation energy (Ea) of biomass gasified gas (BGG) were investigated experimentally and numerically in this study. Non-adiabatic laminar burning velocity (SL) and heat loss (qsw) were measured by a McKenna burner with a cooling-water system under different equivalence ratios (φ). SL,0 and Ea were calculated by a premixed flame linear model based on the flat flame method. Five detailed chemical mechanisms were tested against the experimental data. The results show that the measurable range of BGG is 0.65 ≤ φ ≤ 1.00. Flat flame of BGG has obvious lower and upper limits. qsw is affected by both SL and φ. The reliability of the premixed flame linear model is high and the correlation index (R2) is greater than 0.99 for all cases. The SL,0 of BGG increases from 17.1 to 32.9 cm/s with the increase of φ from 0.65 to 1.00. Since BGG contains a large amount of dilution components, φ has little effect on Ea. Among the five detailed chemical mechanisms, GRI 3.0 has the highest accuracy for predicting SL,0 when 0.80 ≤ φ ≤ 1.00, but USC-Mech II has the best overall performance. San Diego has the best accuracy for predicting Ea, and the maximum relative error is not more than 5.9%.