Ishikawajima-harima Jukogyo Kabushiki Kaisha

Kabushiki Kaisha

Chichibu Cement Kabushiki Kaisha

Tokushu Shunsetsu Kabushiki Kaisha

Ishikawajima-harima Jukogyo Kaisha

Zenzaburo Kawai

Toshikazu Ichiyanagi

Hiroshi Teshigawara

Shoji Sekine

Kanzaburo Sudo

Toshihiro Kobayashi

Hitoaki Mori

Yoshimi Yamamoto

According to the present invention, white cement clinker particles are not burned in a rotary kiln and the burned clinker particles are not immersed in the water to be cooled. White cement clinker raw materials are burned in a fluidized bed burning furnace with a fluid bed or a spouted bed and the clinker particles thus burned are reduced with a reducing gas. The clinker particles thus reduced are first cooled with the water which is sprayed over the clinker particles and then further cooled with the air. The white cement clinker raw material particles fed into the fluidized bed burning furnace are burned into clinker particles while forming a fluidized bed and then the clinker particles thus burned drop through a jet injection pipe into a reduction chamber disposed below the burning furnace and are reduced. The clinker particles thus reduced are rapidly cooled to 600.degree.-700.degree. C. with the sprayed water while being isolated from the surrounding atmosphere in a primary cooling chamber and the clinker particles thus cooled are further cooled in a secondary cooling chamber with the air to 100.degree.-150.degree. C.

Method for producing white cement clinker

Method and apparatus for producing white cement clinker

The present invention discloses a method of removal of nitrogen oxides, particularly for the use in a cement raw material burning installation, said method comprising the step of introducing the reduction agent for the removal of nitrogen oxides into the zone, where is heated to about to 800.degree. to 1,100.degree. C of a duct connecting between a furnace such as a rotary kiln and the lowermost cyclone of a suspension type heater system, thereby removing nitrogen oxides produced in the burning furnace.

Method of removal of nitrogen oxides, particularly for use in cement raw

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Kumagaya, Japan

Zenzaburo Kawai