生物质燃气高温过滤材料的研究

日趋严格的环保要求和某些工艺过程的特殊需要，对生物质燃气中灰尘的数量和粒度提出了更高的要求，即对生物质气化系统中的过滤工艺有了新的要求。针对生物质气化工艺的特点及其灰尘的特性，重点研究了针刺过滤毡和金属多孔材料两类高温过滤材料。通过研究比较，两种材料各有优缺点，针刺过滤毡过滤精度高，运行工况比较稳定，但是过滤气速小，适用温度低，设备比较庞大；金属多孔材料过滤精度相对较低，但是过滤气速和使用温度高，设备相对紧凑。

Research on several high temperature-resistant filter materials

With the improvement of environmental standard and special demand for some engineering processes, strict requirements are proposed for controlling the quantity and size of fly ash in gas cleaning process. Based on the investigation on biomass gasification process and the characteristics of dust, microporous metal mesh and needle punched filter were studied in this paper. It is found that the needle punched filter has high filter precision and relatively stable operating conditions, but low filter gas velocity, temperature application and the equipment relatively large; while the microporous metal mesh has low filter precision, but high filter gas velocity, temperature application and relatively compact equipment. The results would be helpful for the choice of high temperature resistant filter materials.