Abstract: Biomass gasification is an interesting technology in the future development of a worldwide sustainable energy system，as an alternative to fossil fuels. Tar is one of the main barriers to biomass gasification technology in its commercial application as a source of renewable energy. To achieve better efficiency of the biomass producer gas applications，tar must be removed to lower than 20 mg/m3 before the gas is used for downstream internal combustion engines，gas turbines，and in particular for methanol synthesis. In this paper，tar fouling and blocking problems in downstream equipments using the biomass producer gas are presented. Tar definition and classification are described. Advantages of tar reduction based on recovery idea (secondary methods，or named as mechanical/physical method) are analyzed. The new technologies in term of biomass tar removal based on recovery idea are reviewed. The representative biomass gasification technologies，which have lately been successfully demonstrated or commercialized，using the water or oil scrubber recovery method to remove tar，are also discussed. In addition，the future main research areas and potential applications of the advanced multi-stage adsorption or membrane separation for tar deep removal，based on oil-based gas washer (OLGA)，and integrating appropriate pore size corresponding to different tar molecules，are presented.

Key words: biomass gasification, biomass producer gas, tar, recovery, removal

摘要： 生物质气化是重要的可再生能源方式。焦油是生物质气化过程大规模工业化的主要障碍之一。为了提高生物质燃气用于内燃机和燃气轮机发电以及甲醇合成的效率，燃气中的焦油必须深度脱除至低于20 mg/m3。本文简述了焦油污染和堵塞燃气下游设备的危害，介绍了焦油的特征和分类，分析了基于回收过程的焦油脱除方法优势，评述了回收法焦油脱除的研究进展，阐述了水洗和油洗回收脱焦的典型应用实例。指出了以油洗回收法为基础，将焦油和微孔材料的孔径进行匹配，高集成度的吸附和膜分离多级耦合焦油深度脱除工艺，将成为脱除生物质燃气焦油的主要发展方向。

关键词: 生物质气化, 燃气, 焦油, 回收, 脱除