Patents by Inventor Yasuyuki Oosawa

Yasuyuki Oosawa 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 operating blast furnace and method for producing molten pig iron
    Patent number: 9816151
    Abstract: Provided is a blast-furnace operating method including: a first step of adjusting a charging rate of coke while monitoring a furnace-top temperature Ttop; a second step of adjusting an injection rate of pulverized coal while monitoring an in-furnace superficial gas velocity u and the furnace-top temperature Ttop; a third step of adjusting an oxygen-enrichment ratio of oxygen-enriched air while monitoring a tuyere combustion temperature Tf and the furnace-top temperature Ttop; and a fourth step of determining whether an injection rate of the oxygen-enriched air needs to be adjusted, based on a value of the in-furnace superficial gas velocity u.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: November 14, 2017
    Assignee: NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD.
    Inventors: Hiroshi Ichikawa, Yasuyuki Oosawa, Takafumi Hayashi, Shin Tomisaki
  • METHOD FOR OPERATING BLAST FURNACE AND METHOD FOR PRODUCING MOLTEN PIG IRON
    Publication number: 20150275321
    Abstract: Provided is a blast-furnace operating method including: a first step of adjusting a charging rate of coke while monitoring a furnace-top temperature Ttop; a second step of adjusting an injection rate of pulverized coal while monitoring an in-furnace superficial gas velocity u and the furnace-top temperature Ttop; a third step of adjusting an oxygen-enrichment ratio of oxygen-enriched air while monitoring a tuyere combustion temperature Tf and the furnace-top temperature Ttop; and a fourth step of determining whether an injection rate of the oxygen-enriched air needs to be adjusted, based on a value of the in-furnace superficial gas velocity u.
    Type: Application
    Filed: December 4, 2013
    Publication date: October 1, 2015
    Inventors: Hiroshi Ichikawa, Yasuyuki Oosawa, Takafumi Hayashi, Shin Tomisaki