石炭ガス化複合発電向けドライ低NO_xガスタービン燃焼器の開発

摘要

Integrated coal gasification combined cycle (IGCC) equipped with carbon dioxide (CO_2) capture and storage (CCS) is a promising technology for next-generation coal-fired thermal power generation because of its capability to dramatically reduce CO_2 emissions. The authors have been developing dry low-NO_x gas turbine combustors equipped with multi-nole coaxial jet burners for hydrogen-rich syngas fuels in order to achieve high efficiency and low emissions for CCS-equipped IGCC. The burners consist of multiple fuel nozzles and a perforated plate with multiple air holes. At each injection point, one fuel nozzle and one air hole are installed coaxially, so that a fuel jet surrounded by a sheath air jet is injected. The essence of the concept of the burners is the integration of two key technologies: rapid mixing of fuel and air for low-NO_x combustion and flame lifting for flashback-free operation for hydrogen-rich fuels. In this study, the combustors were tested on a practical syngas fuel in a multi-can configuration in an integrated coal gasification power generation pilot plant and the dry low-NO_x performance was evaluated in order to demonstrate the feasibility in IGCC plants. This paper reviews the burner concept and the plant test results.%本稿では，CCS-IGCC向けに開発中のガスタービンクリーン燃焼技術「水素リツチ燃料対応の多孔同軸噴流バーナ」の技術内容，およびこのバーナを備えた燃焼器の実プラント試験によりNO_x 10 ppm未満のドライ低NO_x燃焼を実現した性能試験結果を紹介した。このバーナはCCS-IGCCを実現するためのキー技術であり,今後，本技術のCCS-IGCC実証機への展開に向け,さらに開発を進めていく予定である。