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Indexed by:期刊论文

Date of Publication:2013-10-01

Journal:FUEL

Included Journals:SCIE、EI

Volume:112

Page Number:641-645

ISSN No.:0016-2361

Key Words:Catalytic coal gasification; Steam gasification; Solid heat carrier; Olivine

Abstract:Catalytic coal gasification was carried on a lab-scale external circulating co-current moving-bed (ECCMB) gasification system with steam as gasification agent and olivine as catalytic solid heat carrier. The system is composed of a moving-bed gasifier and a riser combustor. The effects of gasifier temperature, steam/coal mass ratio (S/C), bed materials and bed height on the product gas compositions, carbon conversion, and chemical efficiency were investigated. The result show that the gas yield and carbon conversion increase with the increase of the gasifier temperature. The highest H-2 concentration of 60.4 vol.% is produced from Dayan lignite at the gasifier temperature of 800 degrees C and S/C ratio of 1.0. The carbon conversion increases remarkably at the S/C range from 0 to 0.4. Olivine as the bed material has a satisfying catalytic tar cracking efficiency. Appropriate bed height favors tar destruction because of the increase in the contact time of the tar and steam with the catalytic bed material. (C) 2012 Elsevier Ltd. All rights reserved.