Underground coal gasification using oxygen and steam

Journal Article · Wed Jul 01 00:00:00 EDT 2009 · Energy Sources, Part A: Recovery, Utilization, and Environmental Effects

DOI:https://doi.org/10.1080/15567030802462531· OSTI ID:21240407

Yang, L H; Zhang, X; Liu, S ^[1]

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1. China University of Mining & Technology, Xuzhou (China)

In this paper, through model experiment of the underground coal gasification, the effects of pure oxygen gasification, oxygen-steam gasification, and moving-point gasification methods on the underground gasification process and gas quality were studied. Experiments showed that H{sub 2} and CO volume fraction in product gas during the pure oxygen gasification was 23.63-30.24% and 35.22-46.32%, respectively, with the gas heating value exceeding 11.00 MJ/m{sup 3}; under the oxygen-steam gasification, when the steam/oxygen ratio stood at 2: 1, gas compositions remained virtually stable and CO + H{sub 2} was basically between 61.66 and 71.29%. Moving-point gasification could effectively improve the changes in the cavity in the coal seams or the effects of roof inbreak on gas quality; the ratio of gas flowing quantity to oxygen supplying quantity was between 3.1:1 and 3.5:1 and took on the linear changes; on the basis of the test data, the reasons for gas quality changes under different gasification conditions were analyzed.

• OSTI ID: 21240407
• Journal Information: Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, Vol. 31, Issue 20; ISSN 1556-7036
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL GASIFICATION
IN-SITU GASIFICATION
OXYGEN
STEAM
SYNTHESIS GAS
HYDROGEN
CARBON MONOXIDE
CALORIFIC VALUE
PARAMETRIC ANALYSIS