Citation: WEI Jun-tao, DING Lu, ZHOU Zhi-jie, YU Guang-suo. In-situ analysis of catalytic gasification reaction characteristics of coal char-CO₂ with K₂CO₃ additive[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(11): 1311-1319. shu

In-situ analysis of catalytic gasification reaction characteristics of coal char-CO₂ with K₂CO₃ additive

WEI Jun-tao ^1,2 ,
DING Lu ^1,2 ,
ZHOU Zhi-jie ^1,2 ,
YU Guang-suo ^1,2,,

1.
1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;

Corresponding author: YU Guang-suo,
Received Date: 8 May 2015
Available Online: 13 July 2015
Fund Project: 国家自然科学基金(21376081) (21376081)国家高技术研究发展计划(863计划,2012AA053101)资助项目 (863计划,2012AA053101)

Interactions of catalyst (K₂CO₃) with Shenfu (SF)/Zunyi (ZY) char during gasification were observed by in-situ heating stage microscope. The effects of gasification temperature (750~950℃) and catalyst loading amount (2.2%, 4.4%, 6.6%) were investigated in a thermogravimetric analyzer. The results show that loading K₂CO₃ on SF/ZY stimulates development of pore structure in pyrolysis process. The in-situ heating stage experiments indicates that most of the char particles react with CO₂ in shrinking core mode below the melting point of K₂CO₃. Above this temperature, for SF char, obvious molten potassium catalyst diffusion can be observed in the later reaction stage with rapid consumption of carbon skeleton; but for ZY char, most of the molten potassium exists on the surface of coal char with slower consumption of stable carbon skeleton. Gasification reactivity of SF/ZY char increases with increasing loading amount of K₂CO₃. Catalytic efficiency of potassium catalyst on SF char initially increases and then decreases with gasification temperature, the turning point of gasification temperature is close to the melting point of K₂CO₃. This may be due to blocking of a fraction of pore structure resulted from the good fluidity of molten potassium catalyst.
- in-situ heating stage,
- K₂CO₃,
- fusion,
- catalytic gasification
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In-situ analysis of catalytic gasification reaction characteristics of coal char-CO2 with K2CO3 additive

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In-situ analysis of catalytic gasification reaction characteristics of coal char-CO₂ with K₂CO₃ additive