Mitsui Engineering and Shipbuilding Company Limited

Yutaka Tsukui

Nobuyasu Kanda

Shoichi Ibaragi

Youichi Takahashi

Kimihiko Sugiura

Toshiharu Inaba

A method of exhaust gas denitration in which nitrogen oxides contained in a low-temperature exhaust gas are removed at a high NOremoval efficiency. A injection pipe () is disposed in a flue () for an exhaust gas (x) so that the pipe protrudes from the inner wall of the flue. A hydrocarbon compound (b) and a nitrogen compound (a) are supplied through the injection pipe () into the flue (). The hydrocarbon compound (b) is burned to form a combustion region (s). In this combustion region (s), amine radicals are produced from the nitrogen compound (a). These amine radicals are mixed with nitrogen oxides contained in the exhaust gas (x) to reductively remove the nitrogen oxides.

Method of denitration of exhaust gas and apparatus therefor

A denitration process for removing nitrogen oxides contained in low-temperature exhaust gas at a high denitration rate; namely, a denitration process for reductively removing nitrogen oxides contained in an exhaust gas (x) containing nitrogen monoxide and sulfur dioxide. The process comprises a preliminary stepof partially oxidizing nitrogen monoxide in the exhaust gas to form nitrogen dioxide, a radical formation stepof adding a nitrogen compound and a hydrocarbon compound to a high-temperature zoneto form amine radicals (r), and a denitration stepof mixing the amine radicals (r) with the pretreated gas (p) containing nitrogen monoxide and nitrogen dioxide that was discharged from the preliminary step. As a result, nitrogen oxides in the exhaust gas (x) are reductively decomposed.

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Ichihara, Japan

Yutaka Tsukui