Micropore growth of endothermic gasification reaction

Thesis/Dissertation · Wed Jan 01 00:00:00 EST 1986

OSTI ID:7055665

Ko, C W

Microscopic type solid-gas reaction models have the potential to predict micropore growth during a gasification reaction. The micropore length is assumed to be constant and gasification is assumed to enlarge the radius of all the pores. However none of the published activated carbon pore size distribution data indicates any significant increase in the average micropore size as predicted by these models. By analyzing these published data with the pore system proposed by Zygourakls et al. (1982), a steady state micropore length concept is developed. In this pore system, micropores are assumed to be growing uniformly on the surface of spherical macropores and mesopores are assumed to provide connection among macropores. The steady state micropore length concept is that gasification reaction takes place only on the macropore surface and the end of the micropores, and thus no reaction can occur on the micropore wall to enlarge the micropore size. Furthermore, the reaction on the macropore surface and micropore end will reach steady state in a short period of reaction time resulting in a steady state micropore length. Based on the consideration of the heat transfer caused by the endothermic gasification reaction, a micropore growth model to demonstrate the possibility of the steady state micropore length concept was derived. The improved model can predict the micropore volume changes much better than the Zygourakls' model for fully carbonized samples.

• Research Organization: Arkansas Univ., Fayetteville (USA)
• OSTI ID: 7055665
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ACTIVATED CARBON
MICROSTRUCTURE
COAL GASIFICATION
MATHEMATICAL MODELS
CHEMICAL REACTION KINETICS
DISTRIBUTION
HEAT TRANSFER
POROSITY
SIZE
STEADY-STATE CONDITIONS
ADSORBENTS
CARBON
CRYSTAL STRUCTURE
ELEMENTS
ENERGY TRANSFER
GASIFICATION
KINETICS
NONMETALS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
010600 - Coal
Lignite
& Peat- Properties & Composition