流光电晕放电净化粗燃气焦油及粉尘研究进展

An Overview of Tar and Dust Removal from Biomass-Derived Syngas by Streamer Corona Discharges

研究焦油及粉尘的高效净化方法对推动生物质气化技术的发展具有重要意义。流光电晕放电过程产生的O、H、OH等活性自由基可有效裂解燃气中的焦油类有机物分子,在直流基压上叠加窄脉冲电压则可实现粉尘的荷电及高效气-固分离,是一种较有应用前景的粗燃气净化方法。笔者对流光电晕放电净化粗燃气焦油及粉尘的技术进展进行了综述,分析了该过程的裂解焦油/除尘机理、研究现状及关键科学问题,并提出了一种基于电旋风等离子体反应器的焦油及粉尘同时净化方法。最后针对生物质气化粗燃气净化过程中的瓶颈问题,简要归纳了其研究重点。

A high-efficiency method of tar and dust removal from fuel gas is of great significance to the development of biomass gasification. Streamer corona discharges, which can not only effectively crack the heavy organics to light molecules in raw syngas in reaction with O, H, OH radicals but also charge and separate the dust from the raw syngas with pulsed coronas, is a promising method for raw syngas cleaning. In this paper the status of tar and dust removal by streamer corona discharges were reviewed; issues on mechanism of tar cracking and dust abatement,current situation, key scientific and technical problems of the tar and dust removal from the biomass-derived syngas were analyzed. A conceptual design of an electrocyclone plasma reactor for simultaneous tar and dust removal was proposed. Finally, for the purpose of solving the problems of raw syngas cleaning during biomass gasification, several key research areas were briefly addressed.