Patents by Inventor Toshikazu Tsumura

Toshikazu Tsumura 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: 7665408
    Abstract: A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzle 11 is accelerated by that an additional air nozzle 12 and a separator 35 for separating a flow passage are arranged in the fuel nozzle 11, and the exit of the additional air nozzle 12 is set at a position so as to overlap with the separator 35 when seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle 11. An amount of air from the additional air nozzle 12 is varied corresponding to a combustion load.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: February 23, 2010
    Assignees: Hitachi, Ltd., Babcock-Hitachi K.K.
    Inventors: Hirofumi Okazaki, Masayuki Taniguchi, Toshikazu Tsumura, Yoshitaka Takahashi, Kouji Kuramashi
  • Patent number: 7168374
    Abstract: A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzle 11 is accelerated by that an additional air nozzle 12 and a separator 35 for separating a flow passage are arranged in the fuel nozzle 11, and the exit of the additional air nozzle 12 is set at a position so as to overlap with the separator 35 when seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle 11. An amount of air from the additional air nozzle 12 is varied corresponding to a combustion load.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: January 30, 2007
    Assignees: Hitachi, Ltd., Babcock-Hitachi K.K.
    Inventors: Hirofumi Okazaki, Masayuki Taniguchi, Toshikazu Tsumura, Yoshitaka Takahashi, Kouji Kuramashi
  • Patent number: 6976440
    Abstract: A fuel supply duct, which supplies a mixed fluid of a solid fuel and carrier gas to one or more burners provided on the walls of a furnace, is provided with a branching part, and each of a plurality of branch ducts, which branch out from the branching part, is connected to a corresponding burner. Also a damper, with which the tilt angle with respect to the direction of flow of the mixed fluid can be changed, is positioned in the fuel supply duct at the upstream side of the branching part so that a mutual difference will arise in the solid fuel concentrations of the mixed fluid supplied to the respective branch ducts. A fuel distributor for fuel supply duct is thus arranged. The tilt angle of the above-mentioned damper is adjusted to increase the concentration of solid fuel in the mixed fluid supplied to a specific burner. At a burner to which the high solid fuel concentration is supplied, stability of ignition and stable combustion of the ignited flame can be obtained during low load operation.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: December 20, 2005
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Yoshinori Ohtani, Hidehisa Yoshizako, Hiroaki Kanemoto, Yutaka Takeno, Yoshio Shimogori, Toshikazu Tsumura, Yoshitaka Takahashi
  • Patent number: 6889619
    Abstract: A solid fuel burner and method uses a low oxygen concentration gas as a transporting gas for a low grade solid fuel such as brown coal or the like, provides for accelerating ignition of the fuel and for preventing slugging caused by combustion ash. Mixing of fuel and air inside a fuel nozzle 11 is accelerated by an additional air nozzle 12 and a separator 35 for separating a flow passage, arranged in the fuel nozzle 11, and an exit of the additional air nozzle 12 is set at a position that overlaps with the separator 35. Additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle 11. The amount of air from the additional air nozzle 12 is varied corresponding to a combustion load, in order to assure stable burning of the fuel, and, to suppress radiant heat received by structures of the solid fuel burner and walls of the furnace.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: May 10, 2005
    Assignees: Hitachi, Ltd., Babcock- Hitachi K.K.
    Inventors: Hirofumi Okazaki, Masayuki Taniguchi, Toshikazu Tsumura, Yoshitaka Takahashi, Kouji Kuramashi
  • Publication number: 20050092220
    Abstract: A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzle 11 is accelerated by that an additional air nozzle 12 and a separator 35 for separating a flow passage are arranged in the fuel nozzle 11, and the exit of the additional air nozzle 12 is set at a position so as to overlap with the separator 35 when seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle 11. An amount of air from the additional air nozzle 12 is varied corresponding to a combustion load.
    Type: Application
    Filed: December 15, 2004
    Publication date: May 5, 2005
    Inventors: Hirofumi Okazaki, Masayuki Taniguchi, Toshikazu Tsumura, Yoshitaka Takahashi, Kouji Kuramashi
  • Publication number: 20040231572
    Abstract: A fuel supply duct, which supplies a mixed fluid of a solid fuel and carrier gas to one or more burners provided on the walls of a furnace, is provided with a branching part, and each of a plurality of branch ducts, which branch out from the branching part, is connected to a corresponding burner. Also a damper, with which the tilt angle with respect to the direction of flow of the mixed fluid can be changed, is positioned in the fuel supply duct at the upstream side of the branching part so that a mutual difference will arise in the solid fuel concentrations of the mixed fluid supplied to the respective branch ducts. A fuel distributor for fuel supply duct is thus arranged. The tilt angle of the above-mentioned damper is adjusted to increase the concentration of solid fuel in the mixed fluid supplied to a specific burner. At a burner to which the high solid fuel concentration is supplied, stability of ignition and stable combustion of the ignited flame can be obtained during low load operation.
    Type: Application
    Filed: August 22, 2003
    Publication date: November 25, 2004
    Inventors: Yoshinori Ohtani, Hidehisa Yoshizako, Hiroaki Kanemoto, Yutaka Takeno, Yoshio Shimogori, Toshikazu Tsumura, Yoshitaka Takahashi
  • Publication number: 20040211345
    Abstract: A solid fuel burner using a low oxygen concentration gas as a transporting gas of a low grade solid fuel such as brown coal or the like and a combustion method using the solid fuel burner are provided. The solid fuel burner comprises a means for accelerating ignition of the fuel and a means for preventing slugging caused by combustion ash from occurring. Mixing of fuel and air inside a fuel nozzle 11 is accelerated by that an additional air nozzle 12 and a separator 35 for separating a flow passage are arranged in the fuel nozzle 11, and the exit of the additional air nozzle 12 is set at a position so as to overlap with the separator 35 when seeing from a direction perpendicular to a burner axis, and additional air is ejected in a direction nearly perpendicular to a flow direction of a fuel jet flowing through the fuel nozzle 11. An amount of air from the additional air nozzle 12 is varied corresponding to a combustion load.
    Type: Application
    Filed: November 13, 2002
    Publication date: October 28, 2004
    Applicants: Hitachi, Ltd., Babcock-Hitachi K.K.
    Inventors: Hirofumi Okazaki, Masayuki Tanaiguchi, Toshikazu Tsumura, Yoshitaka Takahashi, Kouji Kuramashi
  • Patent number: 6715432
    Abstract: According to a burner of the present invention, a stable combustion is obtained in a wide range from a high-load operation condition to a low-load operation condition even in the case of low quality solid fuel such as brown coal. The amount of air supplied from additional air holes or additional air nozzles 12 can be adjusted depending on the combustion load of furnace 41. At a low load, the amount of air supplied from additional air holes or additional air nozzles 12 is increased, whereby the oxygen concentration in a recirculation zones 19 formed downstream of the outside of a fuel nozzle 11 exit, permits a stable combustion. At a high load, the amount of air supplied from additional air holes or additional air nozzles 12 is reduced, whereby a flame is formed in a position far from the fuel nozzle 11. This suppresses thermal radiation onto a solid fuel burner 42 structure and a furnace 41 wall.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: April 6, 2004
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Toshikazu Tsumura, Hirofumi Okazaki, Miki Shimogori, Kenji Kiyama, Kouji Kuramashi, Hitoshi Kikuchi, Yoshitaka Takahashi, Shigeki Morita, Kazuhito Sakai, Masayuki Taniguchi, Hironobu Kobayashi
  • Patent number: 6490985
    Abstract: The invention provides a boiler provided with low cost means which can reduce a concentration of CO, an unburned matter, an attached ash and the like near a side wall and maintain a combustion state well with a simple structure. In a boiler having a combustion chamber 13 formed by front and rear walls (burner walls) provided with a plural stages of burners 2, 3 and 4 on at least one of them and opposing to each other, and side walls 1a and 1b crossing to said burner walls 14a and 14b, a gas port 6 containing no fuel for making a pressure of a gas near said side walls 1a and 1b within said combustion chamber 13 higher than a pressure of a gas at a center portion of said combustion chamber 13 is provided between an outermost burner and the side walls 1a and 1b within a range of a height of said burner stages 2, 3 and 4. A combustion gas 16 can not come close to the side walls 1a and 1b due to the jet 18 of the gas.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: December 10, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Yamamoto, Hironobu Kobayashi, Hirofumi Okazaki, Toshikazu Tsumura, Kenji Kiyama
  • Publication number: 20020144636
    Abstract: According to a burner of the present invention, a stable combustion is obtained in a wide range from a high-load operation condition to a low-load operation condition even in the case of low quality solid fuel such as brown coal.
    Type: Application
    Filed: March 19, 2002
    Publication date: October 10, 2002
    Inventors: Toshikazu Tsumura, Hirofumi Okazaki, Miki Shimogori, Kenji Kiyama, Kouji Kuramashi, Hitoshi Kikuchi, Yoshitaka Takahashi, Shigeki Morita, Kazuhito Sakai, Masayuki Taniguchi, Hironobu Kobayashi
  • Publication number: 20020066395
    Abstract: The invention provides a boiler provided with low cost means which can reduce a concentration of CO, an unburned matter, an attached ash and the like near a side wall and maintain a combustion state well with a simple structure. In a boiler having a combustion chamber 13 formed by front and rear walls (burner walls) provided with a plural stages of burners 2, 3 and 4 on at least one of them and opposing to each other, and side walls 1a and 1b crossing to said burner walls 14a and 14b, a gas port 6 containing no fuel for making a pressure of a gas near said side walls 1a and 1b within said combustion chamber 13 higher than a pressure of a gas at a center portion of said combustion chamber 13 is provided between an outermost burner and the side walls 1a and 1b within a range of a height of said burner stages 2, 3 and 4. A combustion gas 16 can not come close to the side walls 1a and 1b due to the jet 18 of the gas.
    Type: Application
    Filed: November 30, 2001
    Publication date: June 6, 2002
    Inventors: Kenji Yamamoto, Hironobu Kobayashi, Hirofumi Okazaki, Toshikazu Tsumura, Kenji Kiyama
  • Patent number: 6338304
    Abstract: A boiler has a combustion chamber formed by front and rear walls and a side wall extending between the front and rear walls. Plural stages of burners are placed on at least one of the front and rear walls. In the front and rear walls are opposing gas jets for making a pressure of the gas near the side wall within the combustion chamber higher than the pressure of the gas at a center portion of the combustion chamber. The gas jet ports are disposed at a height within a range of the height of the burner stages. The burner stages supply the pulverized coal, the air for transferring the pulverized coal and the air for burning. A part of the air for transferring the pulverized coal or the air for burning is supplied in a branched manner to the gas jet port and injected into the combustion chamber. Further, the air is preferably injected from the gas jet ports in a direct gas flow, not a swirling flow.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: January 15, 2002
    Assignees: Hitachi, Ltd., Babcock Hitachi Kabushiki Kaisha
    Inventors: Kenji Yamamoto, Hironobu Kobayashi, Hirofumi Okazaki, Toshikazu Tsumura, Kenji Kiyama
  • Patent number: 6298796
    Abstract: A burner for burning fine coal powder comprising: a fine coal powder nozzle 10 for injecting a mixture of the fine coal powder and air; and air nozzles 11, 12 for injecting air: wherein the sufficient amount of air for complete combustion of the fine coal powder is supplied from the air nozzles; a reducing flame at a high temperature is formed by consuming oxygen rapidly with forming a flame at a high temperature by igniting the fine coal powder rapidly in the vicinity of the outlet of the burner; and an oxidizing flame having an uniform distribution of gas composition in radial direction to the central axis of the burner is formed by mixing the air injected from the air nozzle in the downstream of the reducing flame at the high temperature.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: October 9, 2001
    Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha
    Inventors: Hirofumi Okazaki, Hironobu Kobayashi, Toshikazu Tsumura, Kenji Kiyama, Tadashi Jinbo, Koji Kuramashi, Shigeki Morita, Shinichiro Nomura, Miki Shimogori
  • Publication number: 20010003265
    Abstract: The invention provides a boiler provided with low cost means which can reduce a concentration of CO, an unburned matter, an attached ash and the like near a side wall and maintain a combustion state well with a simple structure. In a boiler having a combustion chamber 13 formed by front and rear walls (burner walls) provided with a plural stages of burners 2, 3 and 4 on at least one of them and opposing to each other, and side walls 1a and 1b crossing to said burner walls 14a and 14b, a gas port 6 containing no fuel for making a pressure of a gas near said side walls 1a and 1b within said combustion chamber 13 higher than a pressure of a gas at a center portion of said combustion chamber 13 is provided between an outermost burner and the side walls 1a and 1b within a range of a height of said burner stages 2, 3 and 4. A combustion gas 16 can not come close to the side walls 1a and 1b due to the jet 18 of the gas.
    Type: Application
    Filed: August 18, 1999
    Publication date: June 14, 2001
    Applicant: MATTINGLY, STANGER & MALUR
    Inventors: KENJI YAMAMOTO, HIRONOBU KOBAYASHI, HIROFUMI OKAZAKI, TOSHIKAZU TSUMURA, KENJI KIYAMA
  • Patent number: 6237510
    Abstract: A combustion burner includes a mixture nozzle (2) defining a mixture fluid passage through which a mixture fluid (1) containing pulverized coal and conveyor gas flows toward a furnace, secondary and tertiary air passages surrounding the mixture nozzle (2), through which secondary air (6) and tertiary air (9) for combustion purposes flow, respectively; and air injection nozzles (24) provided in the vicinity of an outer periphery of a distal end of the mixture nozzle (2). The air (21) is injected from the air injection nozzles (24) toward the axis of the mixture nozzle, so that the high-temperature gas in the vicinity of the outer periphery of the distal end of the mixture nozzle (2) is drawn into the mixture fluid (1) in the vicinity of the outer periphery of this distal end.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: May 29, 2001
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Toshikazu Tsumura, Kenji Kiyama, Tadashi Jimbo, Shigeki Morita, Koji Kuramashi, Kunio Okiura, Shinichiro Nomura, Miki Mori, Noriyuki Ohyatsu, Noboru Takarayama, Toshihiko Mine, Hironobu Kobayashi, Hirofumi Okazaki
  • Patent number: 6189464
    Abstract: A combustion method utilizing a pulverized coal combustion burner which is provided with a pulverized coal nozzle for jetting a fluid mixture of pulverized coal and air and an air nozzle for jetting air. In the method, a combustion flame formed by the pulverized coal combustion burner forms a first zone of a gas phase air ratio of one or less at a radially central portion of the flame and a second zone of a gas phase air ratio of more than one outside of the first zone adjacent the coal nozzle, and a third zone of a gas phase air ratio of one or less at a downstream side from said first and second zones.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: February 20, 2001
    Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha
    Inventors: Hirofumi Okazaki, Hironobu Kobayashi, Toshikazu Tsumura, Kenji Kiyama, Tadashi Jimbo, Kouji Kuramashi, Shigeki Morita, Shinichiro Nomura, Miki Shimogori
  • Patent number: 6152051
    Abstract: A combustion burner includes a mixture nozzle, a gas supply nozzle, and a flow guide. The mixture nozzle extends toward an interior of a furnace, and defines a mixture passage through which a mixture containing powdered solid fuel and gas for transferring the solid fuel flows. A distal end portion of the mixture nozzle is flared so that a flow passage area of the mixture passage increases progressively in a direction of flow of the mixture. The gas supply nozzle radially surrounds the mixture nozzle to define between the gas supply nozzle and the mixture nozzle a gas passage through which a combustion oxygen-containing gas flows toward the furnace. The flow guide is provided within the mixture nozzle at a position upstream of the flared portion of the mixture nozzle with respect to a flow of the mixture so as to make the mixture flow straight along an inner peripheral surface of the flared portion of the mixture nozzle.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: November 28, 2000
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Kenji Kiyama, Toshikazu Tsumura, Tadashi Jimbo, Koji Kuramashi, Shigeki Morita, Miki Mori
  • Patent number: 6112676
    Abstract: A pulverized coal burner includes a pulverized coal nozzle for jetting a mixture of pulverized coal and primary air, a secondary air nozzle and a tertiary air nozzle, concentrically arranged around the outer periphery of the pulverized coal nozzle, and a tube expanded portion at the end of a partition wall separating two adjacent air nozzles. A flow shift means such as a guide plate for shifting the secondary air in the secondary air nozzle so as to flow along the tube expanded portion is provided. The secondary air is jetted outwardly by the guide plate, and mixing of the secondary air and the tertiary air with pulverized coals is delayed, whereby an amount of NOx is decreased.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: September 5, 2000
    Assignees: Hitachi, Ltd., Babcock Hitachi K.K.
    Inventors: Hirofumi Okazaki, Hironobu Kobayashi, Toshikazu Tsumura, Kenji Kiyama, Tadashi Jimbo, Kouji Kuramashi, Shigeki Morita, Shin-ichiro Nomura, Miki Shimogori
  • Patent number: 5806443
    Abstract: To provide a pulverized coal burner capable of reducing the NOx concentration at the time of a low load, a pulverized coal burner includes a secondary air nozzle and a tertiary air nozzle concentrically positioned about the outer periphery of a fuel nozzle carrying a pulverized coal with a primary air, and two swirling flow generators are included at least one of these nozzles with a positional relation parallel to a flow of air. One of the swirling flow of the two swirling flow generators can be set strongly. And, under a condition of low air flow rate, air can be supplied from one swirling flow generator alone. Since the swirling strength of the combustion air can be increased, the concentration of NOx produced by the combustion of the pulverized coal can be reduced. Also, because the swirling strength at the time of low load can be increased, the NOx concentration can be reduced by keeping the pulverized coal flame stable.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: September 15, 1998
    Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha
    Inventors: Hironobu Kobayashi, Kiyoshi Narato, Masayuki Taniguchi, Tsuyoshi Kouno, Hirofumi Okazaki, Shigeki Morita, Toshikazu Tsumura
  • Patent number: 5499087
    Abstract: A heat fixing device includes a heating head formed by attaching a radiant plate to the radiant surface of a PTC heating element using an adhesive having an excellent thermal conductivity, and embedding a heating unit, of which surfaces except the radiant surface are shielded with an adiabatic material, in a recess formed in a holder for supporting the heating unit.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: March 12, 1996
    Assignees: Hitachi, Ltd., Ube Industries, Ltd., Hitachi Koki Co., Ltd.
    Inventors: Chikara Hiraoka, Junichi Matsuno, Masao Mitani, Hiroshi Oda, Toshikazu Tsumura