Patents by Inventor Zenzaburo Kawai

Zenzaburo Kawai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing white cement clinker
    Patent number: 4717337
    Abstract: 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.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: January 5, 1988
    Assignees: Kabushiki Kaisha, Ishikawajima-Harima Jukogyo Kabushiki Kaisha
    Inventors: Toshikazu Ichiyanagi, Kanzaburo Sudo, Zenzaburo Kawai, Shoji Sekine, Hiroshi Teshigawara
  • Method and apparatus for producing white cement clinker
    Patent number: 4573908
    Abstract: 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.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: March 4, 1986
    Assignees: Chichibu Cement Kabushiki Kaisha, Ishikawajima-Harima Jukogyo Kabushiki Kaisha
    Inventors: Toshikazu Ichiyanagi, Kanzaburo Sudo, Zenzaburo Kawai, Shoji Sekine, Hiroshi Teshigawara
  • Method of removal of nitrogen oxides, particularly for use in cement raw material burning installation
    Patent number: 4080218
    Abstract: 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.
    Type: Grant
    Filed: July 13, 1976
    Date of Patent: March 21, 1978
    Assignees: Ishikawajima-Harima Jukogyo Kaisha, Tokushu Shunsetsu Kabushiki Kaisha
    Inventors: Hitoaki Mori, Zenzaburo Kawai, Toshihiro Kobayashi, Yoshimi Yamamoto