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Experimental work to figure out the effect of tuyer inclination angle on performance of small-scale downdraft gasifier fed by rice husk–sawdust blend was performed. Performance of the gasifier in terms of the temperature profile, fuel consumption rate, composition and heating value of producer gas, and cold gas efficiency (CGE) is evaluated. Air is injected at the location of 330 mm above the grate. Tuyer inclination angles observed are 0°, 30°, and 60°. Meanwhile, ratio of rice husk and sawdust is 1:1 by mass and equivalence ratio for gasification is 0.15 for each tuyer inclination angle. The result indicates that the use of inclined tuyer increases maximum temperature and volume fraction of CO and H2 in producer gas thus enhances higher heating value of producer gas. Maximum CGE of 76.29% is found with the use of horizontal tuyer. [ABSTRACT FROM AUTHOR]

In this work, pilot scale throat-less downdraft gasifier is fabricated and tested on rice husk and blend of rice husk-sawdust. The test aims to investigate effect of equivalence ratio on temperature profile, propagation front (flame propagation rate, bed movement rate, and effective propagation rate), and performance of the gasifier (composition of producer gas, heating value of producer gas, and thermal efficiency of the gasifier). Equivalence ratio investigated are 0.15, 0.20, and 0.25, while the blend ratio is 1:1 by mass. The results show that axial temperatures in the reactor surge faster with increasing equivalence ratio during the rice husk gasification and the blend gasification. Typically, flame propagation rate, bed movement rate, and effective propagation rate improve with rising equivalence ratio from 0.15 to 0.25. The best higher heating values and thermal efficiencies are obtained at equivalence ratio of 0.2 and 0.15 for the rice husk gasification and the blend gasification, respectively. [ABSTRACT FROM AUTHOR]