A REVIEW ON GASIFIER MODIFICATION FOR TAR REDUCTION IN BIOMASS GASIFICATION
Keywords:
Biomass, gasification, tar reduction, gasifiers, modificationAbstract
This paper presents a review of gasifier modification for tar reduction in biomass gasification. Biomass gasification has been attracting high interest due to high conversion efficiency and low pollution. Utilization of biomass gasification process for energy and heat application greatly requires low tar content. The tar content in the producer gas will condense at low temperature and block engine parts. Tar content exceeding specified level will reduce the economic value of utilizing producer gas for power generation via internal combustion of engine applications. The reaction mechanisms of tar decomposition generally arise from chain cracking, steam reforming, dry reforming, carbon formation and partial combustion. Gasifier modification for tar reduction can be divided into several categories ie. the addition of air injection, recirculation of pyrolysis gas, combination of pyrolysis gas recirculation and addition of air injection, modification of gas outlet, modification of combustion zone position, separation process for pyrolysis and reduction at different chambers. Combination of several reaction mechanisms for tar reduction occurring with reactor modification will greatly reduce the amount of tar than if one reaction mechanism occurring in reactor modification because of gradual tar reduction occur through partial combustion and reforming or tar cracking in the reactor. Tar can be reduced to fulfill the specified requirement level for the internal combustion engines application through gasifier modification method.References
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