关键词:

谷壳, 吸附/脱附, 压汞法, 真密度, 傅里叶红外, 元素分析

Abstract:

Most studies about biomass gasification focus on the analysis of synthetic gas.The characteristics of particles are seldom discussed.In this paper, the physical characteristics of rice husk and char particles prepared under different gasification processes were studied by physical adsorption/desorption measurements of N₂ (-196℃), mercury intrusion porosimetry (414 MPa) and true density measurement (He).Chemical structures of parent sample and its char particles were discussed with the help of ultimate analyses and FTIR.Based on the analysis result, it was shown that the pore structure of char particles changed with reaction process.BET surface increased rapidly after reaction ratio reached 0.6.But, macropores in char particles had different evolution characteristics.At the beginning of reaction, most pores were macropores.The percentage of macropore decreased with the gasification process.But the absolute number of macropore increased continuously.The comparison results of true density measurement and mercury intrusion porosimetry showed that true density had an opposite changing trend with bulk density during gasification process.Ultimate analyses showed that O,H, N and S had different evolution characteristics during gasification.OH, CO, CH and Ar—H functional groups on particle surface, which were measured by FTIR, consumed rapidly with the gasification reaction.

Key words:

谷壳, 吸附/脱附, 压汞法, 真密度, 傅里叶红外, 元素分析