Development of hybrid filter for air pollution control from small scale biomass combustion

本研究主要研究针孔纤维滤池的新用途，它比传统滤池具有更长的使用寿命和更适中的性能。本研究的动机是增加生物质燃烧能作为碳中性可再生能源。生物质燃烧不仅会排放二氧化碳，还会排放大量的纳米颗粒，对人类健康和全球气候产生影响。通过与管式加热炉的实验室实验对比，研究了居民用小型炉灶或木质和球团炉排出的颗粒物和气态污染物的特性。小型炉膛排放的颗粒物中有70%~90%属于PM1颗粒物，燃烧初期的颗粒物排放量比后期持续燃烧阶段的颗粒物排放量大50%以上。在管式加热炉中进行的球团燃烧批量试验发现，单位燃料质量的颗粒排放随着燃料装载量的增加而增加。此外，还对销孔过滤器在不同条件下进行了初步试验。结果表明，影响针孔过滤器性能的关键因素是针孔周围流动的附加捕集效应，在实验条件下约为2%。

This study focused on new utilization of pin-holed fibrous filter with longer life and more moderate performance than conventional filters. Motivation of this study is increasing of biomass combustion energy as a carbon neutral and re-generable energy resource. It is known that biomass combustion emits not only carbon dioxide, but also a lot of nanoparticles which affect to human's health and global climate.Characteristics of particulate and gaseous pollutants emitted from small scale ovens or wood and pellet stoves for residential use were investigated as a function of operating conditions, compared with laboratory scale experiments using a tube furnace. 70~ 90% of the particles emitted from the small scale stoves were classified as PM1 particles and the particle emission rate during the initial period was 50% or more larger than that in a constantly combusting period that occurred later in the process. From batch tests of pellet burning in the tube furnace, particle emission per fuel mass was found to increase with fuel loading. Furthermore, preliminary test of pin-holed filter has tested in various conditions. From the results, key factor of performance of pin-holed filter has been found as additional collection effect around flow around pinhole, which has around 2% for tested conditions.