Kenichi Ochi
Boiler Engineering Dept., Thermal Power Div., Babcock-Hitachi K.K.
Kenji Kiyama
Boiler Engineering Dept., Thermal Power Div., Babcock-Hitachi K.K.
Hidehisa Yoshizako, Dr. Eng.
Kure Research Laboratory, Babcock-Hitachi K.K.
Hirofumi Okazaki
Energy and Environmental Systems Laboratory, Power Systems Co., Hitachi, Ltd.
Masayuki Taniguchi, Dr. Eng.
Energy and Environmental Systems Laboratory, Power Systems Co., Hitachi, Ltd.
Hitachi has long been working on the development of low NOx combustion technologies to satisfy the worldwide need for environmental conservation and has devised the world-first concept of “in-flame NOx reduction” which has been applied in the field of pulverized coal combustion technology in the HT-NR burner series. Hitachi has developed new technology to lower NOx levels even further by improving the structural design and operation of a two-stage air port system which is used in combination with in-flame NOx reduction. This work has been progressed using a large-scale combustion test facility that simulates actual furnace conditions and through the use of a numerical analysis technique developed in-house. The new technology can lower boiler outlet NOx by 40% for the same level of CO.
NOx, CO, coal, burner
