Citation: DING Liang, ZHANG Yong-qi, HUANG Jie-jie, WANG Zhi-qing, FANG Yi-tian. Effects of pyrolysis pressure on the properties and gasification reactivities of biomass chars[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(11): 1309-1315. shu

Effects of pyrolysis pressure on the properties and gasification reactivities of biomass chars

1.
1. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: ZHANG Yong-qi,
Received Date: 18 July 2014
Available Online: 18 September 2014
Fund Project: 中国科学院战略性先导科技专项(XDA07050100) (XDA07050100) 中国科学院山西煤炭化学研究所前瞻项目(2011SQZBJ01) (2011SQZBJ01) 国家自然科学基金青年科学基金(21106173) (21106173) 山西省青年科技研究基金(2013021007-2). (2013021007-2)

Biomass chars were prepared under different pyrolysis pressures in a pressurized fixed bed reactor. The evolution of chemical composition and physical structure of the biomass chars with the change of pyrolysis pressure were observed by BET, XRD, CHNS elemental analyzer and ICP-AES. The reactivities of biomass chars were evaluated by a thermogravimetric analyzer. The results show that the yields of biomass chars increase with increasing pyrolysis pressure, but reach a plateau above 1.0 MPa. With increasing pyrolysis pressure C content in biomass chars increases, while H content and BET surface area decrease. The degree of graphitization of corn stalk char and sawdust char increases with increasing pyrolysis pressure, while that of rice husk char shows almost no dependence on pyrolysis pressure. The average gasification rates of corn stalk char and sawdust char all decrease with increasing pyrolysis pressure, while pyrolysis pressure has little influence on the gasification rate of rice husk char. Compared the evolution of BET surface area and carbon crystallite structure of biomass chars with biomass char gasification rate, it shows that the difference of carbon crystallite structure of biomass chars, which was brought out by the change of pyrolysis pressure, mainly contributes to the difference of gasification rate of biomass chars prepared under different pyrolysis pressures.
- biomass char,
- pressurized pyrolysis,
- carbon crystallite structure,
- gasification reactivity
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