Mitsubishi Chemical Industries Limited

Yamaha Hatsudoki Kabushiki Kaisha

Koichi Takami

Toshiya Ota

Yoshio Kinsho

Shingo Abe

Hirotsugu Oga

Toshinori Tsutsumi

Yukio Takigawa

Takahiro Fukushige

A compressed exhaust gas containing nitrogen oxides discharged from a compressed absorption type nitric acid plant is treated by adding ammonia or an ammonia precursor to the gas and passing the gas through a NO.sub.x removing catalytic layer to an exhaust gas turbine wherein the temperature of the main flow of the exhaust gas in the zone from the point of which ammonia or an ammonia precursor is added to the outlet of the exhaust gas turbine is maintained at a temperature higher than T.degree. K = 10.sup.3 / (1.91 - 0.228 log P) [P : a sum of partial pressures of ammonia and nitrogen oxides (atm.)] and feeding an inert gas into the place of the zone in which the exhaust gas stagnates.

Method of treating exhaust gas discharged from nitric acid plant

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Kitakyushu, Japan

Koichi Takami