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A biomass waste producer gas has a good potential as renewable sources fuel of either spark ignition (SI) or compression ignition (CI) engine. Several biomass wastes have been utilised as a feedstock of gasification process to produce producer gas. High heating value and low tar content producer gas should be obtained in biomass gasification. The producer gas has to be cleaned up to remove tar when it is used for the engines. The present paper aims to review a thermo-chemical conversion of a biomass into a producer gas, tar removal method and utilisation of a producer gas as fuel of internal combustion engine. Many previous published works are studied, cited and summarised in the present work. The review indicates that performance of a gasifier is affected by gasifier design and operating parameters, i.e. feedstock properties and size, gasification medium, equivalence ratio and gasification temperature. Tar removal can be approached using primary or secondary technique. Modification of the intake system of either SI or CI engine is required when the engine is fuelled with a producer gas. [ABSTRACT FROM AUTHOR]

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]