CATALYTIC GASIFICATION MECHANISM OF RICE HUSK WITH CARBON DIOXIDE
Using magnesia and ferric oxide as catalyst, the properties and reaction kinetics of rice husk (RH) catalytic gasification were investigated in a thermogravimetric analyzer under ambient pressure. The homogeneous model (HM) and shrinking core model (SCM) were used to correlate the relationships between conversion (α) and temperature (T). Then the reaction activation energies (E) and pre-exponential factors (A) of rice husk with different catalysts were obtained in the low and high temperature part. The results indicated that MgO and Fe2O3 had a strong influence on the pyrolysis temperature and gasification reactivity and could increase the gasification rate very effectively. In the range of 220 – 420℃, the apparent activation energies of RH/MgO and RH/Fe2O3 were very close to those of RH, but in the range of 860 - 1000℃, magnesia and ferric oxide made the activation energy lower by more than 32.6％ and 17.9％ separately compared to the pure RH. The activation energy ranged from 15.25 - 67.28 kJ/mol, which was calculated by the above two models (HM, SCM). In the low temperature part (pyrolysis)，the reaction mechanism was apt to HM, but in the high temperature part (gasification), the reaction mechanism was apt to SCM.
Rice husk catalytic gasification kinetics homogeneous model shrinking core model
Peng FU Jun XIANG Song HU Lushi SUN Jinming SHI Anchao ZHANG Yantao ZHU Junying ZHANG
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, P.R.China
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
75-80
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）