Patents by Inventor Shigeru Shimojo

Shigeru Shimojo 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).

  • Patent number: 6689332
    Abstract: A process for removing CO2 from a combustion gas which comprises bringing a combustion gas containing oxygen and CO2 and a CO2 absorbent solution into contact at the atmospheric pressure, thereby allowing the CO2 absorbent solution to absorb CO2 from the combustion gas, and, in the ensuing step, heating the absorbent solution that has absorbed CO2 to liberate CO2 and regenerate the CO2 absorbent solution, and circulating the regenerated solution for reuse. An aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol (AMP), 2-(ethylamino)-ethanol (EAE), 2-(methylamino)-ethanol (MAE), and 2-(diethylamino)-ethanol (DEAE) is used as the CO2 absorbent solution, and carbon steel is used in building the members of the equipment that contact the aqueous hindered amine solution. The absorbent solution contains cupric carbonate which is a corrosion inhibitor.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: February 10, 2004
    Assignees: The Kansai Electric Power Co, Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 6500397
    Abstract: There are disclosed a method for removing CO2 from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with an aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylaminoethanol, 2-ethylamino-ethanol and 2-piperidineethanol; and another method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) selected from the group consisting of 2-amino-2-methyl-1, 3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1, 3-propanediol, t-butyldiethanolamine and 2-amino-2-hydroxymethyl-1,3-propanediol; and 1-25 parts by weight of an amine compound (Y) selected from the group consisting of piperazine, piperidine, morpholine, glycine, 2-methylamino-ethanol, 2-piperidineethanol and 2-ethylaminoethanol.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: December 31, 2002
    Assignees: The Kansai Electrical Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
  • Patent number: 6274108
    Abstract: A process is provided for removing carbon dioxide out of combustion exhaust gas by scrubbing the exhaust gas with an aqueous solution of monoethanolamine in a scrubber, and regenerating the carbon dioxide-loaded aqueous solution of monoethanolamine in a regenerator. The process is provided with means for replenishing the aqueous solution of monoethanolamine with a stock, aqueous solution containing from about 70% to about 75% by weight of monoethanolamine. By providing a stock, aqueous solution containing from about 70% to about 75% by weight of monoethanolamine, which is injected into the carbon dioxide-loaded aqueous solution of monoethanolamine being transferred from the scrubber to the regenerator, the entire carbon dioxide recovery system is free from flammables, rendering fire-fighting precautions unnecessary.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: August 14, 2001
    Assignees: The Kansai Electric Power Co., Ltd., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Toru Seto, Shigeaki Mitsuoka
  • Patent number: 6036931
    Abstract: There are disclosed a method for removing CO.sub.2 from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with an aqueous solution of a hindered amine selected from the group consisting of 2-amino-2-methyl-1-propanol, 2-methylaminoethanol, 2-ethylaminoethanol and 2-piperidineethanol; and another method for removing carbon dioxide from a combustion exhaust gas which comprises the step of bringing the combustion exhaust gas under atmospheric pressure into contact with a mixed aqueous solution of 100 parts by weight of an amine compound (X) selected from the group consisting of 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-ethyl-1,3-propanediol, t-butyldiethanolamine and 2-amino-2-hydroxymethyl-1,3-propanediol; and 1-25 parts by weight of an amine compound (Y) selected from the group consisting of piperazine, piperidine, morpholine, glycine, 2-methylaminoethanol, 2-piperidineethanol and 2-ethylaminoethanol.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: March 14, 2000
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
  • Patent number: 5750083
    Abstract: This invention relates to methods for the removal of hydrogen sulfide from various gases containing hydrogen sulfide. In order to remove hydrogen sulfide, an aqueous solution containing a di(lower alkyl)amino-(lower alkanol) or triethylenediamine is used. In order to remove hydrogen sulfide selectively from gases containing carbon dioxide and hydrogen sulfide, an aqueous solution containing tert-butyldiethanolamine, triisopropanolamine, triethylenediamine or 2-dimethylamino-2-methyl-1-propanol is used. In order to remove both carbon dioxide and hydrogen sulfide from gases containing carbon dioxide and hydrogen sulfide, an aqueous solution containing a mono(lower alkyl)amino-(lower alkanol) is used.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: May 12, 1998
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5744110
    Abstract: This invention provides a method for the removal of CO.sub.2 present in combustion exhaust gas which comprises bringing combustion exhaust gas at atmospheric pressure into contact with a mixed aqueous solution containing 100 parts by weight of an amino acid metal salt (X), 1 to 25 parts by weight of piperazine (Y), and optionally a copper compound in such an amount as to give a divalent copper ion concentration of 10 to 1,000 ppm based on the mixed aqueous solution, the amino acid metal salt being of the general formulaCH.sub.3 NR.sup.1 CHR.sup.2 COOM (1)wherein R.sup.1 and R.sup.2 represent hydrogen atoms or lower alkyl groups, provided that R.sup.2 is a lower alkyl group when R.sup.1 is a hydrogen atom, and R.sup.2 is a hydrogen atom when R.sup.1 is a lower alkyl group, and M represents an alkali metal.Potassium dimethylaminoacetate is a preferred amino acid metal salt (X).
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: April 28, 1998
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5700437
    Abstract: A method for removing carbon dioxide from a combustion exhaust gas under atmospheric pressure by the use of a mixed solution of a specific amine compound X having an alcoholic hydroxyl group and a primary amino group which is bonded to a tertiary carbon atom having two unsubstituted alkyl groups and another amine compound Y being a diaminotoluene (DAT) selected from the group consisting of 2,3-DAT, 2,4-DAT, 2,5-DAT, 2,6-DAT, 3,4-DAT and 3,5-DAT.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: December 23, 1997
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Koichi Kitamura, Yukihiro Jinno, Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5648053
    Abstract: A process for removing both CO.sub.2 and NO.sub.x from combustion gases consists, first, in cooling a combustion gas to 50 to 100.degree. C. and adding ozone to oxidize NO in the combustion gas to NO.sub.2. Then in a CO.sub.2 removal step, the gas is brought into contact with an aqueous solution of an alcoholic hydroxyl-containing secondary- or tertiary-amine to remove NO.sub.2 together with CO.sub.2 from the gas.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: July 15, 1997
    Assignees: The Kansai Electric Power Co. Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5618506
    Abstract: This invention relates to the process for removing CO.sub.2 from CO.sub.2 -containing gas such as combustion gas. For example, it is the process for removing CO.sub.2 from combustion gas through the contact of the gas at the atmospheric pressure with an aqueous solution of an amine represented by the general formula R.sup.1 NHC(CH.sub.3).sub.2 CH.sub.2 OH in which R.sup.1 is a lower alkyl group having 1-4 carbon atoms, or an aqueous solution containing both an amine represented by the general formula R.sub.2 CHR.sub.3 NHCH.sub.2 CH.sub.2 OH in which R.sup.2 is a hydrogen atom or a lower alkyl group having 1-4 carbon atoms and R.sup.3 is a hydrogen atom or methyl group and a piperazine compound selected from the group consisting of piperazine, 2-methylpiperazine, 2,3-dimethylpiperazine, and 2,5-dimethylpiperazine, or an mixed aqueous amine solution containing a secondary amine and a tertiary amine at concentrations of 10-45% by weight each, or an aqueous solution of a piperazine derivative.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: April 8, 1997
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Hitomi Suzuki, Atsushi Hayakawa, Tomio Mimura, Shigeru Shimojo, Hidenobu Shimayoshi, Masaki Iijima, Shigeaki Mitsuoka, Toru Iwaki
  • Patent number: 5609840
    Abstract: This invention relates to methods for the removal of hydrogen sulfide from various gases containing hydrogen sulfide. In order to remove hydrogen sulfide, an aqueous solution containing a di(lower alkyl)amino-(lower alkanol) or triethylenediamine is used. In order to remove hydrogen sulfide selectively from gases containing carbon dioxide and hydrogen sulfide, an aqueous solution containing tert-butyldiethanolamine, triisopropanolamine, triethylenediamine or 2-dimethylamino-2-methyl-1-propanol is used. In order to remove both carbon dioxide and hydrogen sulfide from gases containing carbon dioxide and hydrogen sulfide, an aqueous solution containing a mono(lower alkyl)amino-(lower alkanol) is used.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: March 11, 1997
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5603377
    Abstract: A heat pipe includes: a pipe barrel; and a large number of fins disposed on the peripheral surface of the pipe barrel at least on either a heat collecting section side or a radiating section side, each of the fins is attached to the pipe barrel on a plane perpendicular to the axis of the pipe barrel, and each of the fins is composed of a metal plate and net-like material adhered to both surfaces of the metal plate.A heat exchanger of gas-liquid contacting plate type includes: a plurality of heat transfer plates, disposed vertically at certain intervals, defining air flow passages therebetween which allow air to rise, and each of the plates has a heat medium flowing passage thereinside for allowing a heat medium to flow therethrough while the side surfaces of each of the heat transfer plates, which define the air flow passages, are adhered with nets for allowing a liquid to flow downward along the nets and plates.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: February 18, 1997
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Koichi Kitamura, Yukihiro Jinno, Tomio Mimura, Shigeru Shimojo, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5603908
    Abstract: A process for removing CO.sub.2 from a combustion gas which comprises removing CO.sub.2 from the combustion gas through contact of an aqueous hindered amine solution used as a CO.sub.2 absorbent solution with the combustion gas at atmospheric pressure and then, in a regeneration column, liberating CO.sub.2 from the absorbent solution that has absorbed CO.sub.2 by heating it and thereby regenerating the absorbent solution. The process further comprises a partial absorbent solution regeneration step in at least one stage wherein the absorbent solution that has absorbed CO.sub.2 is heated through heat exchange with a high-temperature regenerated absorbent solution and part of the CO.sub.2 that is liberated is separated from the absorbent solution. Following this, according to the necessity, part of the partially regenerated absorbent solution thus obtained is returned to the step of removing CO.sub.2 from the combustion gas for use as part of the CO.sub.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: February 18, 1997
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kunihiko Yoshida, Tomio Mimura, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
  • Patent number: 5536454
    Abstract: An apparatus for gas-liquid contact in which tubular structure fillers having a cross section of any of various shapes and having straight tubular portions are arranged in a substantially vertical direction in the form of plural steps so that the gas-liquid contact surfaces of the fillers may be parallel with the flow of the gas,the apparatus for gas-liquid contact being characterized in that the gas-liquid contact surfaces comprise rough surface portions, porous surface portions, meshes or plates to which meshes adhere, or there is interposed, between the plural steps of the fillers, a dispersing plate for receiving the liquid downward coming from the site above the fillers, dispersing the liquid, and allowing the liquid to downward flow.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 16, 1996
    Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Kansai Electric Power Co., Inc.
    Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kouichi Kitamura, Yukihiro Jinno, Tomio Mimura, Shigeru Shimojo, Masami Kawasaki, Kunihiko Yoshida, Mutsunori Karasaki, Masaki Iijima, Shigeaki Mitsuoka
  • Patent number: 5378442
    Abstract: A method for recovering carbon dioxide by absorbing carbon dioxide present in a combustion exhaust gas using an aqueous alkanolamine solution, comprising the step of bringing a combustion exhaust gas from which carbon dioxide has been absorbed and removed into contact with water containing carbon dioxide. A method for treating a combustion exhaust gas for denitration using ammonia as a reducing agent and for removal of carbon dioxide by absorption with an aqueous alkanolamine solution, which method comprising the steps of recovering ammonia present in the combustion exhaust gas after the carbon dioxide removal, and using the recovered ammonia as a reducing agent for the denitration. A method for removing CO.sub.2 from a combustion exhaust gas comprising the step of bringing the combustion exhaust gas into contact under atmospheric pressure with an aqueous monoethanolamine solution having a concentration of 35% by weight or more.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: January 3, 1995
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Koichi Kitamura, Masami Kawasaki, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
  • Patent number: 5344627
    Abstract: A process for removing carbon dioxide (CO.sub.2) from a combustion exhaust gas of a boiler (1) which generates steam for driving high (3), intermediate (7), and low (8) pressure turbines. The process comprises the steps of removing CO.sub.2 in the combustion exhaust gas by absorption with a CO.sub.2 -absorbing liquid (19), liquefying the removed CO.sub.2 (28) by compression (42) and cooling (48), storing (52) the CO.sub.2, and regenerating the CO.sub.2 -absorbing liquid by a CO.sub.2 -absorbing liquid regeneration column (24) equipped with a reboiler (30). In the process, a part (40) of steam discharged from the high pressure turbine (3) is used to drive turbines (41, 43) for compressors (42, 44) that compress the CO.sub.2, and a refrigerant for cooling the CO.sub.2, and steam (45) discharged from the compressor turbines is supplied as a heating source to the reboiler (30) for the regeneration of the CO.sub.2 -absorbing liquid.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: September 6, 1994
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Taiichiro Suda, Yoshitsugu Hotta, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Touru Seto, Shigeaki Mitsuoka
  • Patent number: 5339633
    Abstract: An electric generating power plant and a method of operation thereof wherein the boiler (1) produces steam to a turbine driven-generator (2), carbon dioxide from combustion exhaust gas emitted from the boiler is simultaneously absorbed in an absorbing solution in an absorber (7), the absorbing solution with the absorbed carbon dioxide is passed through a regenerator (10) where the carbon dioxide is stripped from the absorbing solution, the regenerated absorbing solution is returned to the absorber (7), and steam from either the boiler (1) or turbine of the turbine-driven generator (2) is supplied to a reboiler (13) to provide heat for operation of the regenerator (10). During periods of high demand for electric power steam extraction from the boiler or turbine is discontinued, operation of the regenerator (10) is discontinued and the absorbing solution from the absorber (7) is stored in a first storage unit (15).
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: August 23, 1994
    Assignees: The Kansai Electric Power Co., Ltd., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Toru Seto, Shigeaki Mitsuoka
  • Patent number: 5318758
    Abstract: An apparatus and a process for removing CO.sub.2 from a combustion exhaust gas, by effecting counterflow contact of aqueous alkanolamine solution with the combustion exhaust gas to absorb CO.sub.2 from the gas in the alkanolamine solution and effecting a further contact of the gas with either, condensate water formed by causing condensation of the gas after removal of CO.sub.2, or condensate water formed by causing condensation of the combustion exhaust gas directly after combustion of the fuel. The apparatus includes a tower (1), a first contact section (2) in the tower through which the exhaust gas flows upwardly in counterflow contact with the aqueous alkanolamine solution dispersed by a nozzle device (7) downstream of the first contact section (2), a second contact section (3) in the tower (1) downstream of the nozzle device (7) for effecting counterflow contact of reflux water from a spent absorbent liquor regenerating tower (28) with the gas after removal of CO.sub.2.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: June 7, 1994
    Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Kansai Electric Power Co., Inc.
    Inventors: Masumi Fujii, Yoshitsugu Hotta, Taiichiro Suda, Kenji Kobayashi, Kunihiko Yoshida, Shigeru Shimojo, Mutsunori Karasaki, Masaki Iijima, Fumio Tomikawa, Touro Seto, Shigeaki Mitsuoka
  • Patent number: 4907542
    Abstract: An improved cleaning system for a horizontal type tube assembly which can achieve cleaning of the outer surfaces of the tubes in the tube assembly automatically by remote control without necessitating human labor of workers who are compelled to work in a narrow limited space, is disclosed.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: March 13, 1990
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Takuzo Maeyama, Kenichi Nii, Shigeru Shimojo, Keiichi Iwamoto, Masaaki Torichigai
  • Patent number: 4879973
    Abstract: An automatic tube circumference scanning apparatus automatically performs inspections, repairs and other operation on a group of tubes arrayed in a narrow space and extending in horizontal directions. The apparatus includes an upper support/traverse section mounted on an upper tube in the group of tubes so as to be able to travel along a tube axis and to stop and grip the upper tube, a lower support/traverse section mounted on a lower tube so as to be able to travel, stop and grip the lower tube, a flexible rail extending vertically between the upper and lower support/traverse sections and fixed thereto, and a probe scanning section mounted on the flexible rail so as to be able to move up and down and which grips any arbitrary tube between the aforementioned upper and lower tubes for making a probe scan around such tube.
    Type: Grant
    Filed: July 1, 1988
    Date of Patent: November 14, 1989
    Assignees: The Kansai Electric Power Co., Inc., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Takuzo Maeyama, Kenichi Nii, Shigeru Shimojo, Keiichi Iwamoto, Masaaki Torichigai, Kiyoshi Koizumi