Geological CO2 storage by underground coal gasification
Transcript of Geological CO2 storage by underground coal gasification
Journal of MMIJ Vol.126 (2010) No.10,11
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by Sohei SHIMADAa, Hitoshi KOIDEb and Ken-ichi YAMAZAKIc
a. Associate Prof., Dr, Graduate School of Frontier Sciences, The University of Tokyo (Corresponding author E-mail: [email protected])b. Visiting Prof., Research Institute for Science and Engineering, Waseda Universityc. (late) President, Coal Resources and Mining Engineering Co., Ltd.
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Journal of MMIJ Vol.126 p.602 â 607 (2010)
©2010 The Mining and Materials Processing Institute of Japan
*2009幎 10æ 15æ¥åä»ã2010幎 3æ 23æ¥åç1. æ®éäŒå¡ æ±äº¬å€§åŠå€§åŠé¢ æ°é ååµæç§åŠç ç©¶ç§ åææ2. æ®éäŒå¡ æ©çš²ç°å€§åŠ çå·¥åŠç 究æ 客å¡ææ3. (æ ª )é±å±±ãšã³ãžãã¢ãªã³ã° ç€Ÿé· (æ 人 )[èè é£çµ¡å ] FAX : 04-7136-4701 E-mail : [email protected]ããŒã¯ãŒãïŒ ç³çïŒå°äžã¬ã¹åïŒççŒåŒïŒéççŒåŒïŒCO2å°äžåºå®ïŒã¡ã¿
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Geological CO2 Storage by Underground Coal Gasification
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Coal is generally used as solid fuel on the surface after open cut mining or underground mining. However, the coal seam mined economically is limited by the geological and technological conditions. In situ method is a promising method, which enables the energy recovery from deep coal seam and under sea coal seam, usually being not economical by conventional mining methods. In âin situâ method the coal is usually converted to gaseous form underground (UCG: Underground Coal Gasification). One of the features of this method is the CO2 storage in coal seam in parallel to the gas production.
There are two methods for UCG, combustion and non-combustion methods. The former is the conventional UCG realizing the coal gasification by supplying heat through the combustion of coal seam. The other one is non-combustion method using microbial decomposition and supercritical CO2 extraction for gas production at temperatures of some 10 or 100 degrees Celsius. The CO2-reducer methanogenic archaea are found in underground coal seams, in petroleum reservoirs and in saline aquifers in Japan. The underground bioreactors for CO2-reduction and methanogenesis may be realized in deep coal measures or in underground hydrocarbon accumulations.
The former UCG is now booming up for the technology development in the world now towards commercialization. The latter UCG is the still in the R&D stage. This report summarizes the present state of arts of these two UCG methods pressing the gas production and CO2 storage in coal seam.KEY WORDS: Coal, Underground Gasification, Combustion, Non-Combustion, Geological CO2 Storage,
Methanogenesis
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Fig.1 Coal reserves suitable for UCG in Japan by rank, thickness and depth.
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