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| (1)The global environment technology |
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CO2 Capture and Storage Technology Development
CO2 geological and marine storage may be the ultimate solution to reduce
greenhouse gas emissions if all other energy conservation and high
efficiency energy utilization techniques fail. For CO2 geological and marine
storage, CO2 may be stored in aquifers, exhausted oil and gas fields or coal
seams.
The Japan CO2 Sequestration in Coal Seams Project (JCOP) was conducted in
Yubari City, Hokkaido, between fiscal 2002 and 2007 as a project subsidized by the
Ministry of Economy, Trade and Industry (METI). In the project, 870 tons (440,000
m3N) of CO2 was injected into coal seams. JCOAL was in charge of the on-site
preliminary injection test and successfully developed techniques to inject and store
CO2 in coal seams as well as to recover coal bed methane gas (CBM) replaced by
the injected CO2. Among the various results, it was found that 1.7 m3N of CO2
injected into a coal bed replaced 1 m3N of methane gas and that permeability
reduction due to swelling coal seams could be alleviated by injecting N2. |
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| (2)Flue Gas Processing and Gas Cleaning Technology |
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Dry-type Desulfurization & Denitrification process
The flue gas passes through a packed bed charged with activated coke produced from coal by
the forming and activation processes. Sulfur oxides contained in the flue gas are absorbed by the
activated coke and nitrogen oxides are reduced on the activated coke by ammonia, which has
been added upstream of the bed, into nitrogen and water.
The activated coke is taken out of the equipment and then regenerated by heating for recycling. The high concentration sulfur removed
by this regenerator is recovered as concentrated sulfuric acid or high-purity sulfur. Unlike the
general wet-type desulfurization, this equipment does not decrease the gas temperature. |
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| (3)Effective Utilization Technology of Coal Ash |
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The Japan Coal Energy Center (JCOAL) has been engaged in various activities to promote the use
of coal, including international activities and public relations, as well as research and development
into coal utilization technology. As one of its main activities, JCOAL has been developing
technologies for the effective utilization of coal ash.
JCOAL has been implementing a nation-wide survey on coal ash utilization for enterprises in
general industries in Japan with the aim of developing and expanding technologies for the effective
utilization, as the production of coal ash is estimated to increase in the future. This survey has been
carried out with the support of the Coal Section, Natural Resources and Fuel Department, Agency
for Natural Resources and Energy, Ministry of Economy, Trade and Industry, and with the
assistance of various companies. The results of electric power industries were provided by the
Federation of Electric Power Companies of Japan and the Japan Fly Ash Association. And the
results of the survey for general industries are also included in this survey report. |
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