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Coal gasification is one of the key technologies for utilization of coal. Coal gasification mainly consists of coal pyrolysis, char gasification, and gas-phase reactions. Soot is made up of fine solid carbon particles formed by volatile matter decomposition and has lower gasification reactivity than char. Since the solid products of coal gasification contain both char and soot, it is difficult to...
The purpose of this study is to investigate the structural changes in nascent chars during the gasification of two low-rank coals in CO2 at 1000°C and 1200°C. Western Australian Collie sub-bituminous coal and Victorian Loy Yang brown coal were heated up at 1000Ks−1 in He/CO2 in a wire-mesh reactor. FT-Raman spectroscopy was applied to understand the key structural features of nascent chars. For comparison,...
Partially sharing of active sites on char particle by multicomponent gasifying agent and detailed chemistry of water–gas-shift reaction are modeled and implemented. A three-dimensional RANS-based simulation with these models is also performed to investigate effects of a CO 2 injection on gasification characteristics within an entrained flow coal gasifier. Results show that the gasification...
In a coal gasifier, CO 2 gasification and H 2 O gasification occur at the same time. Many researchers have constructed CO 2 gasification model and H 2 O gasification model separately. Only a few models explain the competition between CO 2 gasification and H 2 O gasification. These models are divided into two types according to the properties of the active...
Separation of brown coal into fractions having rather uniform structure is believed to be one of the promising pretreatment methods for effective utilization of brown coal. The authors have recently presented a new coal fractionation method that can separate a bituminous coal into several fractions having different molecular weight compounds without decomposing the coal. The method extracts coal using...
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