Patents by Inventor Eiji Ochi
Eiji Ochi 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: 8292992Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.Type: GrantFiled: January 29, 2008Date of Patent: October 23, 2012Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Toshihiro Sato, Manabu Oda, Koichiro Iwashita, Eiji Ochi, Susumu Okino, Takeo Shinoda, Tetsu Ushiku
-
Publication number: 20090188393Abstract: A flue gas desulfurization apparatus includes an absorption tower that absorbs sulfur oxide in a flue gas, and drift suppression members that are arranged near a bend portion of a purified gas exhaust passage arranged at an outlet portion of the absorption tower, the drift suppression members serving to collect mist particles.Type: ApplicationFiled: January 29, 2008Publication date: July 30, 2009Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Toshihiro SATO, Manabu ODA, Koichiro IWASHITA, Eiji OCHI, Susumu OKINO, Takeo SHINODA, Tetsu USHIKU
-
Patent number: 6913737Abstract: The present invention provides a method for the treatment of mercury present in exhaust gas wherein, after a chlorinating agent is added to exhaust gas containing nitrogen oxides, sulfur oxides and mercury, the exhaust gas is subjected to a reductive denitration treatment in the presence of a solid catalyst and then to wet desulfurization using an alkaline absorbing fluid, the method being characterized by measuring the mercury concentration in the exhaust gas after the wet desulfurization; calculating a predicted value of the inlet mercury concentration before the reductive denitration treatment on the basis of the measured mercury concentration; and controlling the feed rate of the chlorinating agent added prior to the reductive denitration treatment, according to the deviation of the predicted value from a reference inlet mercury concentration, as well as a system for the treatment of exhaust gas.Type: GrantFiled: July 18, 2001Date of Patent: July 5, 2005Assignee: Mitsubishi Heavy Industies, Ltd.Inventors: Shintaro Honjo, Toru Takashina, Eiji Ochi
-
Patent number: 6773680Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: GrantFiled: November 14, 2002Date of Patent: August 10, 2004Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Patent number: 6740297Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: GrantFiled: November 14, 2002Date of Patent: May 25, 2004Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Publication number: 20040033172Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: ApplicationFiled: November 14, 2002Publication date: February 19, 2004Inventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Publication number: 20030235525Abstract: The present invention provides a method for the treatment of mercury present in exhaust gas wherein, after a chlorinating agent is added to exhaust gas containing nitrogen oxides, sulfur oxides and mercury, the exhaust gas is subjected to a reductive denitration treatment in the presence of a solid catalyst and then to wet desulfurization using an alkaline absorbing fluid, the method being characterized by measuring the mercury concentration in the exhaust gas after the wet desulfurization; calculating a predicted value of the inlet mercury concentration before the reductive denitration treatment on the basis of the measured mercury concentration; and controlling the feed rate of the chlorinating agent added prior to the reductive denitration treatment, according to the deviation of the predicted value from a reference inlet mercury concentration, as well as a system for the treatment of exhaust gas.Type: ApplicationFiled: March 3, 2003Publication date: December 25, 2003Inventors: Shintaro Honjo, Toru Takashina, Eiji Ochi
-
Publication number: 20030077209Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: ApplicationFiled: November 14, 2002Publication date: April 24, 2003Inventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Publication number: 20030072692Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: ApplicationFiled: November 14, 2002Publication date: April 17, 2003Inventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Patent number: 6534024Abstract: The present invention provides an exhaust gas treatment process wherein exhaust gas containing mercury and sulfur dioxide is subjected to a desulfurization treatment in a desulfurizing absorption tower and then passed through a mist eliminator for removing and recovering mist from the desulfurized exhaust gas, the process including the step of removing mercury from the desulfurized exhaust gas by feeding thereto an oxidizing agent such as sodium hypochlorite and an antioxidant such as methanol unreactive with the oxidizing agent at a position upstream of the aforesaid mist eliminator.Type: GrantFiled: November 30, 2000Date of Patent: March 18, 2003Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Shintaro Honjo, Toru Takashina, Eiji Ochi
-
Patent number: 6517792Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: GrantFiled: August 8, 2001Date of Patent: February 11, 2003Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Patent number: 6511636Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: GrantFiled: September 27, 1999Date of Patent: January 28, 2003Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Patent number: 6506348Abstract: There is provided a heavy oil fired boiler exhaust gas treatment apparatus which removes soot and dust and SO3 in the heavy oil fired boiler exhaust gas efficiently at a low cost without using an excessively large apparatus. The treatment apparatus comprises a charging device 3 provided at the inlet of an absorption tower of a wet type exhaust gas desulfurizer 4 and neutralizer pouring means A provided on the upstream side of the charging device 3 to pour a neutralizer into exhaust gas and neutralize SO3 in the exhaust gas.Type: GrantFiled: November 10, 1998Date of Patent: January 14, 2003Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Eiji Ochi, Takeo Shinoda, Toru Takashina, Masakazu Onizuka
-
Publication number: 20030007900Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: ApplicationFiled: September 27, 1999Publication date: January 9, 2003Inventors: TAKU SHIMIZU, KAZUAKI KIMURA, KIYOSHI OKAZOE, ATSUSHI TATANI, NAOHIKO UKAWA, MASAO HINO, SUSUMU OKINO, TAKASHI HARUKI, TORU TAKASHINA, EIJI OCHI
-
Patent number: 6471073Abstract: A liquid extracting apparatus in accordance with the present invention is configured so that a connection pipe 22a (suction-side pipe) of a pump 22 for extracting slurry liquid content is connected to the upper end side of a liquid content introduction path to which slurry in a tank 8 can be introduced to attain the precipitation and separation of solid content, and a number of tubes 26 are packed at the lower end portion of the liquid content introduction path 21. The present invention can provide a simple liquid extracting apparatus that can effectively extract only liquid content in the slurry (suspension) moving in the tank.Type: GrantFiled: June 2, 2000Date of Patent: October 29, 2002Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Yoshihiro Okamoto, Eiji Ochi, Atsushi Tatani, Susumu Okino, Toru Takashina
-
Publication number: 20020009403Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350° C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: ApplicationFiled: August 8, 2001Publication date: January 24, 2002Inventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Publication number: 20010007647Abstract: The present invention provides an exhaust gas treatment process wherein exhaust gas containing mercury and sulfur dioxide is subjected to a desulfurization treatment in a desulfurizing absorption tower and then passed through a mist eliminator for removing and recovering mist from the desulfurized exhaust gas, the process including the step of removing mercury from the desulfurized exhaust gas by feeding thereto an oxidizing agent and an antioxidant unreactive with the oxidizing agent at a position upstream of the aforesaid mist eliminator. The process of the present invention makes it possible to remove mercury, particularly metallic mercury vapor, effectively from a large-volume gas (e.g., exhaust gas from an electric power plant) and to reduce the operating cost of an exhaust gas treatment system significantly.Type: ApplicationFiled: November 30, 2000Publication date: July 12, 2001Inventors: Shintaro Honjo, Toru Takashina, Eiji Ochi
-
Patent number: 6149713Abstract: The dust concentration of the flue gas leaving an electrostatic precipitator and introduced into an absorption tower of a desulfurizer is adjusted to a level of 100 to 500 mg/Nm.sup.3. At the same time, a dust slurry having a higher dust concentration is separated and withdrawn from the slurry within the aforesaid absorption tower, and then subjected to a solid-liquid separation treatment. Thus, solid matter containing dust at a high concentration is extracted and discharged out of the system of the desulfurizer.Type: GrantFiled: November 13, 1998Date of Patent: November 21, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Eiji Ochi, Takeo Shinoda, Toru Takashina, Susumu Okino
-
Patent number: 6113863Abstract: Five combustion exhaust gas treatment systems capable of removing dust and selenium (Se) in combustion exhaust gas and making harmless are proposed: (1) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se is transformed into insoluble compound, and Se is separated; (2) combustion exhaust gas is cooled to 350.degree. C. or less, dust is separated, Se elution preventive agent is added, and dust is formed into scale; (3) dust in combustion exhaust gas is collected by dust collector, dust is formed into slurry by making use of part of circulation liquid in desulfurization apparatus, and tetravalent Se in dust slurry is transformed into insoluble compound, which is separated into solid and liquid; (4) dust is separated from combustion exhaust gas by dust collector, and it is heated to gasify Se, and is led into desulfurization apparatus, etc.Type: GrantFiled: January 26, 1996Date of Patent: September 5, 2000Assignee: Mitsubishi Jukogyo Kabushiki KaishiInventors: Taku Shimizu, Kazuaki Kimura, Kiyoshi Okazoe, Atsushi Tatani, Naohiko Ukawa, Masao Hino, Susumu Okino, Takashi Haruki, Toru Takashina, Eiji Ochi
-
Patent number: 6076369Abstract: The present invention provides an evaporative concentration apparatus for waste water having an evaporating vessel 2 for evaporatively concentrating waste water and a heater 3 for circularly heating an in-vessel liquid in the evaporating vessel 2, in which the whole or part of thermal energy of generated steam 6 discharged from the evaporating vessel 2 is recovered by an absorption heat pump 29, and the thermal energy is supplied to the heater 3. According to the present invention, evaporative concentration can be effected efficiently in the evaporating vessel by effectively utilizing the thermal energy of generated steam, and also the operation of evaporative concentration apparatus can be performed stably by stably securing heating steam quantity.Type: GrantFiled: November 13, 1998Date of Patent: June 20, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Eiji Ochi, Takeo Shinoda, Atsushi Yoshioka, Hideki Kamiyoshi, Atsumasa Endo