700度C級A-USCボイラ実証のための実缶試験結果

Abstract

石炭火力のCO2排出量削減対策の一つとして, 当社では700度C級先進超々臨界圧 (A-USC)火力発電ボイラ技術の開発を実施してきた. A-USCは火力発電設備の蒸気条件を高めることにより, 発電端効率の向上を実現するものであり, 既存火力発電設備の延長線上に位置する技術であるため, ほかのCO2排出量削減技術と比べて開発要素が少ないという利点がある. A-USCボイラ開発の集大成として石炭焚き商用機に試験伝熱面を挿入し, 700度C蒸気を導入する実缶試験を実施し, 2016 年には約13 000 hの試験運転を完了した. 抜管した試験伝熱面の評価を実施した結果, 問題がないことを確認した.

700 C Advanced-Ultra Super Critical (A-USC) technology, developed by IHI, is one of the solutions for reducing CO2 emissions from coal-fired power plants. A-USC is achieving higher efficiency by raising the steam parameters of the plant to reduce CO2 emissions. Since raising the steam temperature is an extension of the conventional technologies, the A-USC solution has the advantage of less development tasks compared to other solutions. Pursuing A-USC technology development, the demonstration test loop of 700 C-class verification test loop was installed in a commercially operated coal-fired boiler and testing in which the steam temperature exceeded 700 C has already been completed in October 2016. Total operating hours has reached approximately 13 000 hours and various testing for sample tubes has been conducted.