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In order to figure out the compatibility of downdraft gasifiers on different feedstocks, performance of a fixed-bed downdraft gasifier fed by rice husk, sawdust, and their mixture (1:1 by mass) are compared in the present work. Gasification is performed with varying equivalence ratio, i.e. 0.15, 0.20, and 0.25. Gasification air is injected into the reactor via three tuyers located at 330 mm above the grate. Gasification characteristics (temperature profile of the reactor, fuel consumption rate, volume fraction of CO, H2, and CH4in the producer gas) and performance of the gasifier (lower heating value of the producer gas and cold gas efficiency of the gasifier) are observed and analyzed. The results indicate that the gasifier is compatible for rice husk, sawdust, or their mixture. Optimum equivalence ratio for gasification of the rice husk, sawdust, and the mixture are 0.20, 0.20, and 0.15, respectively. At the optimum equivalence ratios, lower heating values of the producer gas are 3.13, 2.69, and 0.35 MJ/Nm3for rice husk, sawdust, and the mixture. Meanwhile, cold gas efficiencies are 72.73%, 69.27%, and 82.08%, correspondingly.

•Utilization of a low-density polyethylene (LDPE) plastic waste into oil fuel.•Experimental study an effect of zeolite catalyst sizes on pyrolysis performance.•Pyrolysis is performed with zeolite sizes of 1, 2, and 3 mm in diameter.•Smaller zeolite size increases heat transfer rate, pyrolysis temperature, reaction rate, and oil yield.•The maximum oil yield and its HHV are obtained with zeolite size of 1 mm in diameter.