Patents by Inventor Akira Shimokura

Akira Shimokura 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).

  • Pressurized internal circulating fluidized-bed boiler
    Patent number: 5513599
    Abstract: A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.
    Type: Grant
    Filed: March 2, 1994
    Date of Patent: May 7, 1996
    Assignee: Ebara Corporation
    Inventors: Shuichi Nagato, Masayuki Horio, Takahiro Oshita, Norihisa Miyoshi, Seiichiro Toyoda, Akira Shimokura, Tomoyuki Shinano, Shugo Hosoda
  • Method for concentrating black liquor with oxidizing followed by CO.sub.2 addition
    Patent number: 4911787
    Abstract: A method and apparatus are disclosed for concentrating an alkaline waste liquor containing sulfur compounds, the so-called black liquor, which is discharged from a step of Kraft-cooking wood fibers, in order to recover the cooking chemicals from said waste liquor, characterized in that CO.sub.2 gas and/or a gas containing CO.sub.2 gas is added to said waste liquor as a boiling-point-lowering agent, viscosity-lowering agent and solidification promoter, after a step of oxidizing said waste liquor and in or prior to one or more stages during the step of concentrating said waste liquor. Also disclosed is an apparatus for concentrating an alkaline waste liquor containing substantially no sulfur compounds (i.e.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: March 27, 1990
    Assignee: Research Association of Pulp and Paper Technology
    Inventors: Akira Shimokura, Keiji Hasegawa, Shuichi Nagato, Kazushige Tanae, Tokiya Yaguchi
  • Pressurized internal circulating fluidized-bed boiler
    Patent number: RE37300
    Abstract: A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: July 31, 2001
    Assignee: Ebara Corporation
    Inventors: Shuichi Nagato, Masayuki Horio, Takahiro Oshita, Norihisa Miyoshi, Seiichiro Toyoda, Akira Shimokura, Tomoyuki Shinano, Shugo Hosoda