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Indexed by:期刊论文

Date of Publication:2018-03-01

Journal:FUEL PROCESSING TECHNOLOGY

Included Journals:SCIE、EI

Volume:171

Page Number:110-116

ISSN No.:0378-3820

Key Words:Low-rank coal; Decoupling gasification; Dual loop; Hydrogen-rich gas; Tar removal; Olivine

Abstract:A dual loop gasification (DLG) system consisting of three separated reactors and two bed material circulation loops has been proposed for steam gasification of low-rank coal to obtain hydrogen-rich gas with low tar content. The system decouples the gasification process into fuel gasification, tar destruction and residual char combustion, which occur in three independent reactors correspondingly, i.e. a gasifier, a reformer and a combustor. Both the gasifier and the reformer are separately interconnected with the single combustor, forming two bed material circulation loops in parallel. In this way, both the gasifier and the reformer could be operated individually under optimized conditions. With Shenmu bituminous coal as feedstock and calcined olivine as both solid heat carrier and in-situ tar destruction catalyst, the performance of the system for the steam gasification of the coal has been investigated. It has been found that the tar was effectively removed under higher reformer temperature and in the presence of the olivine catalyst, and the coal gasification was promoted at higher gasifier temperature, S/C and ER.