Mitsubishi Heavy Industries Limited

Mitsubishi Jukogyo Kabushiki Kaisha

Tetsuji Yamaguchi

Akira Notomi

Takashi Inami

Iwami Ishihara

Takayuki Maeda

Toshiaki Nishio

Yoshimi Onitsuka

Yuichi Kojima

Masakazu Matsui

Ryoji Miki

A powder material for powder plasma build-up welding which exhibits excellent resistance and bending properties comprises C in an amount of 0.06 to 0.15% (% by weight, the same hereinafter), Si in an amount of 0.2 to 1.0%, Mn in an amount of 0.2 to 1.0%, Cr in an amount of 17 to 30%, Nb in an amount of 0.6 to 1.5%, Ni in an amount of not more than 0.5%, and the balance consisting of Fe and unavoidable impurities.

Powder material for powder plasma overlaying and powder plasma overlaying metal

An improved exhaust gas NO.sub.x removal system removes NO.sub.x from exhaust gas through a catalytic reduction process making use of ammonia or its precursor as a reducing agent. The system includes a vaporizer in which ammonia or its precursor is vaporized, and one or a plurality of nozzles provided in a flue upstream of an NO.sub.x removal catalyst layer. The number of nozzles corresponds to a cross-sectional area of the same flue. These nozzles eject the ammonia or its precursor, vaporized by superheated steam within the vaporizer, into the flue. The superheated steam to be used in the vaporizer for evaporating ammonia or its precursor can be taken from the exhaust gas boiler itself in which NO.sub.x removal is to be effected.

Exhaust gas NO.sub.x removal system

Growing community of inventors

Nagasaki, Japan

Tetsuji Yamaguchi