Patents by Inventor Hiroshi Takezaki

Hiroshi Takezaki 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).

  • Publication number: 20100071348
    Abstract: After adjusting an exhaust gas temperature at an exit of a heat recovery unit (11) of an exhaust gas treating apparatus to not more than a dew point temperature of sulfur trioxide (SO3), a heavy metal adsorbent is supplied from a heavy metal adsorbent supply unit (16) disposed in an exhaust gas at an entrance of a precipitator (4) or an intermediate position within the precipitator (4), and the exhaust gas containing the heavy metal adsorbent is supplied into the precipitator (4). Preferably at this stage, the heavy metal adsorbent is supplied into the exhaust gas at the entrance of the precipitator (4) 0.1 seconds after the exhaust gas temperature at the exit of the heat recovery unit (11) has been adjusted to not more than the dew point temperature of SO3.
    Type: Application
    Filed: December 24, 2007
    Publication date: March 25, 2010
    Applicant: BABCOCK-HITACHI KABUSHIKI KAISHA
    Inventors: Kazuki Kobayashi, Hirofumi Kikkawa, Hiroshi Ishizaka, Hiroshi Takezaki, Hiroyuki Nosaka
  • Publication number: 20090249691
    Abstract: Apparatus for gasifying a solid fuel that supplies a solid fuel such as coal by dry condition to a gasification furnace of an entrained-bed type is constructed so as to be able to collect the char discharged from the gasification furnace and re-supply the char to the furnace without using a lock hopper and without changing the char into slurry form. The char discharged from the gasification furnace along with produced gases 53 produced in the gasification furnace is brought into contact with water by a gas cooler 9 and collected. After being dehydrated by a dehydrator 10, the collected char is loaded into a mill 2 or a raw-coal bunker 1. For loading into the raw-coal bunker 1, the char is dried by a drying machine 14, preferably, after the dehydration. According to the present invention, a mixture of the collected char and water can be re-supplied to the gasification furnace without using a lock hopper or a dry feeder.
    Type: Application
    Filed: February 1, 2006
    Publication date: October 8, 2009
    Applicants: HITACHI, LTD., ELECTRIC POWER DEVELOPMENT CO., LTD., BARCOCK-HITACHI K.K.
    Inventors: Toru Akiyama, Fumihiko Kiso, Shinji Tanaka, Hirofumi Okazaki, Fumihiko Hanayama, Kazunori Sato, Takahiro Nishida, Hiroshi Takezaki, Akio Ueda, Makoto Takeda
  • Patent number: 4786289
    Abstract: A process for producing a coal-water slurry of low viscosity and high coal concentration with a low specific energy and a good efficiency is provided, which process comprises wet-grinding coal by means of a wet vertical ring-roll mill in the presence or absence of a surfactant and recycling a part of the coal ground by the mill, as it is, without classifying it, to the mill through a splitter.
    Type: Grant
    Filed: February 12, 1988
    Date of Patent: November 22, 1988
    Assignee: Babcock-Hitachi Kabushiki Kaisha
    Inventors: Kazunori Shoji, Hirofumi Kikkawa, Hiroshi Takezaki, Yoshinori Ohtani