IGCCシステムの概要とガス化炉スラグの有効利用(<特集>石炭灰とスラグ)

概要

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The Integrated coal Gasification Combined Cycle (IGCC) has received a lot of attention in recent years. IGCC is basically different from conventional pulverized coal thermal power generation systems because electricity is generated by a combined cycle. Thus, it is said that IGCC is much more efficient than a normal coal-fired power plant. In IGCC, the coal after gasification is collected not as coal ash but as slag. Slag has a tremendous amount of potential for effective use in the field of concrete production because no hazardous components leach from it and it is simple to handle it compared with coal ash. This paper describes how the aggregate test and concrete test were conducted on coal gasification slag in order to examine whether coal ash slag can be used as a fine aggregate for concrete. The results of these tests showed that concrete made from slag has almost the same compressive strength as concrete in which land sand is used. In addition, the drying shrinkage rate and freeze-thaw resistance, which are values related to durability, of such slag concrete did not show any difference from concrete made with land sand. From these results, it can be concluded that coal gasification slag has a possibility for use in structural concrete.
2011-05-20