Patents by Inventor Mitsugi Suehiro
Mitsugi Suehiro 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).
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Publication number: 20060141414Abstract: A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and burned; a nitrogen oxide reduction step downstream of the first combustion treatment step, in which a portion of the hydrogen sulfide-containing gas or the ammonia-containing gas is introduced and the nitrogen oxides produced in the first combustion treatment step are reduced in a reducing atmosphere; and a second combustion treatment step downstream of the nitrogen oxide reduction step, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned. The present invention provides a combustion apparatus suitable for use as a combustion furnace for off-gases resulting from the wet purification of coal gasification gas.Type: ApplicationFiled: February 27, 2006Publication date: June 29, 2006Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., Ryoen Technical Service Corp.Inventors: Masahiro Harada, Makoto Susaki, Kazuo Ishida, Hajime Nagano, Masahiro Hirano, Hiroshi Suzumura, Shintaro Honjo, Yoshinori Koyama, Katsuhiko Yokohama, Mitsugi Suehiro
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Patent number: 7005115Abstract: A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and burned; a nitrogen oxide reduction step downstream of the first combustion treatment step, in which a portion of the hydrogen sulfide-containing gas or the ammonia-containing gas is introduced and the nitrogen oxides produced in the first combustion treatment step are reduced in a reducing atmosphere; and a second combustion treatment step downstream of the nitrogen oxide reduction step, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned. The present invention provides a combustion apparatus suitable for use as a combustion furnace for off-gases resulting from the wet purification of coal gasification gas.Type: GrantFiled: September 18, 2002Date of Patent: February 28, 2006Assignees: Mitsubishi Heavy Industries, Ltd., Ryoen Technical Service Corp.Inventors: Masahiro Harada, Makoto Susaki, Kazuo Ishida, Hajime Nagano, Masahiro Hirano, Hiroshi Suzumura, Shintaro Honjo, Yoshinori Koyama, Katsuhiko Yokohama, Mitsugi Suehiro
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Publication number: 20030108831Abstract: A gas combustion treatment method for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, the method comprising a first combustion treatment step in which the ammonia-containing gas, together with a fuel, is introduced and burned; a nitrogen oxide reduction step downstream of the first combustion treatment step, in which a portion of the hydrogen sulfide-containing gas or the ammonia-containing gas is introduced and the nitrogen oxides produced in the first combustion treatment step are reduced in a reducing atmosphere; and a second combustion treatment step downstream of the nitrogen oxide reduction step, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned. The present invention provides a combustion apparatus suitable for use as a combustion furnace for off-gases resulting from the wet purification of coal gasification gas.Type: ApplicationFiled: September 18, 2002Publication date: June 12, 2003Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., Ryoen technical Service Corp.Inventors: Masahiro Harada, Makoto Susaki, Kazuo Ishida, Hajime Nagano, Masahiro Hirano, Hiroshi Suzumura, Shintaro Honjo, Yoshinori Koyama, Katsuhiko Yokohama, Mitsugi Suehiro
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Patent number: 5464604Abstract: Disclosed are, in a method for purifying a high-temperature reducing gas in which sulfur compounds present in a high-temperature reducing gas are absorbed and removed by an absorbent according to a dry method, a method for purifying a high-temperature reducing gas which is characterized in that a reducing gas is supplied into a gas containing sulfur dioxide gas which is discharged from a regeneration system for regenerating the absorbent which system forms a system together with an absorption system in which the sulfur compounds are absorbed with the absorbent, a resulting gas mixture is led through a reactor filled with a catalyst, the sulfur dioxide gas and the reducing gas are let react with each other under pressurization so that elemental sulfur is directly produced and recovered as liquid sulfur; and the above method which is further characterized in that catalyst layers in the reactor in which the sulfur dioxide gas and the reducing gas react with each other are divided into parts or made to have a pluType: GrantFiled: April 28, 1994Date of Patent: November 7, 1995Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Mitsugi Suehiro, Toru Seto, Shigeaki Mitsuoka, Kenji Inoue
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Patent number: 5427752Abstract: A process for purifying high-temperature reducing gases containing sulfureous contaminants including hydrogen sulfide and carbonyl sulfide with an absorbent, said process characterized in that at least three reactor towers which are filled with an absorbent are used, and said process comprises the three steps of absorption, regeneration, and reduction, and during in a part of operation two reactor towers are connected in series so as to carry out regeneration, and O.sub.2 concentration can be controlled separately for each regenerating reactor tower in the regeneration step, and steam can be supplied so as to prevent excessive reduction of the absorbent from occurring in the reduction step. The life of the absorbent can be extended and operational costs may be reduced.Type: GrantFiled: June 7, 1993Date of Patent: June 27, 1995Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Ryomei Engineering Co., Ltd.Inventors: Mitsugi Suehiro, Touru Seto, Shigeaki Mitsuoka, Kenji Inoue, Kazuhiko Shirota
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Patent number: 5154900Abstract: In a method for absorbing and removing sulfur compounds such as hydrogen sulfide and carbonyl sulfide present in a high-temperature reducing gas using an absorbent,disclosed is a method for purifying a high-temperature reducing gas which is characterized in that: said method uses at least four towers of reactors filled with an absorbent and comprises four steps which are an absorption step for absorbing and removing sulfur compounds with an absorbent, a regeneration step for regenerating said absorbent using a gas containing oxygen, a cooling step after the regeneration step, and a reduction step for reducing said regenerated and cooled absorbent with a high-temperature reducing gas until the concentration of the reducing gas becomes uniform before and after passing through the absorbent; heat is continuously recovered from the high-temperature gas at the outlet of the regeneration reactor in said regeneration step; and the regeneration and absorption performance is thus stabilized.Type: GrantFiled: June 20, 1991Date of Patent: October 13, 1992Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Central Research Institute of Electric Power IndustryInventors: Toshio Nakayama, Hiromi Shirai, Makoto Kobayashi, Mitsugi Suehiro, Toru Seto, Shigeaki Mitsuoka, Kenji Inoue
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Patent number: 4994257Abstract: The present invention is directed to a method for purifying a high-temperature reducing gas by continuously circulating the processes of reducing a regenerated absorbent with the high-temperature reducing gas, until concentrations of aimed reducing gases have become uniform on upstream and downstream sides of the absorbent, and absorbing sulfur compounds by the use of this absorbent and thereby removing these sulfur compounds therefrom; the aforesaid method being characterized by using at least three reactors filled with the absorbent, by consisting of the four steps of reduction, absorption, SO.sub.2 reduction and regeneration, and by comprising the steps of feeding a circulating gas from the regenerating step to the SO.sub.2 reducing step; converting an SO.sub.2 gas produced in the regenerating step and the SO.sub.2 reducing step into elemental sulfur and recovering the latter as liquid sulfur; and introducing a part of the SO.sub.2 gas into the reducing step and returning the remaining SO.sub.Type: GrantFiled: April 23, 1987Date of Patent: February 19, 1991Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Mitsugi Suehiro, Toshikuni Sera, Kenji Inoue, Akira Shimada