Patents Assigned to Babcock-Hitachi Kabushiki Kaisha
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Patent number: 7654396Abstract: A classifier capable of stably providing particles by further reducing the mixing ratio of coarse particles including a rotating fin (21) classifying solid particles by a centrifugal force, a cylindrical downward flow forming member (13) installed on the outer peripheral side of the rotating fin (21), a recovery cone (11) disposed under the rotating fin (21) and the downward flow forming member (13), and a housing (41). A contraction flow area (16) is formed between the housing (41) and the recovery cone (11), and a two-phase flow (52) formed of the mixture of the solid particles and gases blown up through the contraction flow area (16) is collided with the downward flow forming member (13) on the upper side of the housing (41) to form it in a downward flow. Then, that flow is led to the rotating fin side, classified into the fine particles and the coarse particles, and the fine particles are carried together with an airstream, passed through the rotating fin (21), and removed.Type: GrantFiled: May 12, 2005Date of Patent: February 2, 2010Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yutaka Takeno, Hiroaki Kanemoto, Teruaki Tatsuma, Takashi Harada, Taketoshi Tanabe
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Patent number: 7651329Abstract: In an exhaust gas processing device wherein in order to efficiently outwardly discharge heat at high temperatures of about 90-150° C. released from a GGH reheater during the shutdown of a desulfurizer, to prevent damage to equipment and corrosion preventive lining material, and to ensure long-term stabilized use of the exhaust gas processing device, at least a GGH heat recovery unit, an absorption tower, a mist eliminator (M/E), and the GGH reheater are placed in a duct for exhaust gases discharged from a fire furnace, in the order named as seen from the upstream side of a flow of exhaust gases, an exhaust gas duct between the M/E and the reheater is provided with a heat radiation device or the like having a heat suppression function for suppressing dissipated heat from the reheater.Type: GrantFiled: January 29, 2004Date of Patent: January 26, 2010Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Hajime Okura, Toshio Katsube, Takayuki Saito
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Patent number: 7651389Abstract: An exhaust smoke processing system comprises air preheater for heating combustion air by exhaust smoke discharged from a boiler, a heat recoverer for heating a heat medium by exhaust smoke discharged from the air preheater, a dust collector for collecting soot and dust in exhaust smoke discharged from the heat recoverer, a wet-type exhaust smoke processing apparatus for processing exhaust smoke discharged from the dust collector, a reheater for heating exhaust smoke discharged from the wet-type exhaust smoke processing apparatus by the heat medium, and a heat medium circulation pipe passage for circulating the heating medium between the reheater and the heat recoverer. the system measures a heavy metal concentration in the exhaust smoke and adjusts the temperature of exhaust smoke at an outlet of the heat recoverer such that the measured value falls within a predetermined range.Type: GrantFiled: September 8, 2003Date of Patent: January 26, 2010Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Hirofumi Kikkawa, Takanori Nakamoto, Toshio Katsube
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APPARATUS FOR REMOVING OF TRACE OF TOXIC SUBSTANCE FROM EXHAUST GAS AND METHOD OF OPERATING THE SAME
Publication number: 20100000410Abstract: An apparatus for removing of traces of toxic substances from exhaust gas, comprising, disposed in sequence from the upstream side in a flow channel of exhaust gas emitted from combustion equipment, a denitration unit including a denitration catalyst layer capable of removing nitrogen oxides from the exhaust gas and capable of oxidizing metallic mercury; an air preheater adapted for heat exchange between air for combustion in the combustion equipment and the exhaust gas; a dust removal unit having a bag filter containing a catalyst for metallic mercury oxidation; and a desulfurization unit for removing sulfur oxide from the exhaust gas. The bag filter may be disposed in advance of the desulfurization unit. Thus, there can be provided an apparatus for removing of traces of toxic substances from exhaust gas that is stable over a prolonged period of time and is highly reliable; and provided a method of operating the same.Type: ApplicationFiled: July 26, 2006Publication date: January 7, 2010Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Yoshinori Nagai, Toshio Katsube, Isato Morita, Hirofumi Kikkawa, Yasuyoshi Kato -
Publication number: 20090320687Abstract: An absorbing tower is provided in its side wall with a gas entrance for introducing a combustion exhaust gas into the absorbing tower, and an absorbing liquid is sprayed from the nozzles of a spray header into the exhaust gas introduced to rise from the gas entrance. A trough is arranged in the side wall of the absorbing tower and above the gas entrance, and a nose having a horseshoe shape in a top plan view and extending into tower is disposed in the tower side wall portion of the gas entrance other than the portion arranging the trough and at the same or at substantially the same height as the portion of the trough. The absorbing liquid, which is sprayed from the nozzle and drops along the absorbing tower wall portion, is rescattered to the center portion of the absorbing tower excepting the entrance of the absorbing tower, so that the gas-liquid contact efficiency is improved while suppressing an increase in pressure loss, thereby to prevent the drift of the gas at the tower wall portion.Type: ApplicationFiled: September 19, 2007Publication date: December 31, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Takuro Ueda, Takanori Nakamoto, Atsushi Katagawa, Hajime Okura, Hiroshi Ishizaka
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Publication number: 20090311155Abstract: A catalyst is provided having higher mercury oxidation performance than a conventional catalyst without increasing catalyst quantity or enhancing SO2 oxidation performance and constitutes an oxidation catalyst for metal mercury, which contains a molybdenum and vanadium complex oxide, for example, MoV2O8, as a main component having a catalytic activity and is formed by placing the molybdenum and vanadium complex oxide in layers only on the surface of a plate-like or honeycomb-like porous carrier. The porous carrier contains Ti and W and has a function of an NOx removal catalyst as a whole.Type: ApplicationFiled: September 21, 2007Publication date: December 17, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Keiichiro Kai, Yasuyoshi Kato
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Publication number: 20090277334Abstract: Absorption liquid recirculating pipes fitted with absorption tower (absorber) recirculating pumps corresponding to individual spray headers are inserted from the void tower portion inside absorption tower, near the liquid surface of liquid trapping portion (recirculation tank), in the interior of the absorption tower, erected vertically from substantially the center of the absorption tower and connected to respective spray headers provided in multiple stages along the direction of gas flow. Multiple nozzles of each of the spray headers are disposed mutually concentrically or rectangularly on a plane orthogonal to the direction of flue gas flow within the absorption tower.Type: ApplicationFiled: September 20, 2006Publication date: November 12, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Naoki Oda, Atsushi Katagawa, Hajime Okura
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Publication number: 20090263305Abstract: Exhaust (Flue) gas of boiler is introduced through gas inlet part (port) (2) of flue-gas desulfurization apparatus (system), and absorbent liquid sprayed from spray nozzle (5) of absorbent liquid spray section (4) is trapped (stored) in liquid trapping (recirculation tank) section (7). There, agitation is performed by means of propeller (11) of oxidation agitator (8) to thereby oxidize SO2 absorbed from the exhaust (flue) gas into gypsum. In the liquid trapping section (7), oxidation air is fed from posterior air pipe (10) and anterior air pipe (13) behind and ahead of liquid propulsion (to the rear and front of a liquid discharge) by the propeller (11). Thus, even when the amount of oxidation air must be increased in accordance with an increase of boiler load, the oxidation efficiency can be enhanced without increasing of the number of agitators.Type: ApplicationFiled: September 20, 2006Publication date: October 22, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Naoki Oda, Takanori Nakamoto, Hiroyuki Nosaka
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Patent number: 7591987Abstract: A method for treating an ammonia (NH3)-containing gas, which comprises causing the NH3-containing gas to pass through a catalyst tower (9) firstly with a pre-treatment catalyst layer (1) having, in parallel, a flow path involving a catalyst layer having the function of oxidizing NH3 to form NO and a flow path involving a catalyst layer not having the above function, and then, contacting the resultant gas with a catalyst layer (2) having in combination, the denitration function and the function of oxidizing NH3 to form NO; and an apparatus for practicing the method.Type: GrantFiled: November 12, 2004Date of Patent: September 22, 2009Assignee: Babcock-Hitachi Kabushiki KaishaInventor: Yasuyoshi Kato
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Patent number: 7585807Abstract: A method is disclosed for producing a NOx catalyst which includes dispersing a hydrated titanium dioxide or dried material, tungstic acid or a salt, and a sol-like material. The sol-like material is formed by dispersing cerium dioxide in a dispersion medium to form a catalyst slurry or paste. Supporting the catalyst slurry or paste is a catalyst carrier.Type: GrantFiled: February 28, 2003Date of Patent: September 8, 2009Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Yasuyoshi Kato, Naomi Imada, Yoshinori Nagai
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Publication number: 20090220401Abstract: An exhaust smoke denitrating apparatus in which using an NH3 injection unit, compressed air is fed from blower to ejector for extracting of exhaust gas from HRSG1, and with thus obtained mixed gas, NH3-containing gas is produced from NH3 water by NH3 water evaporator, the NH3-containing gas injected through NH3-containing gas injection nozzle of the HRSG1 disposed on a front stream side of denitration catalyst layer. As any high-temperature exhaust gas is cooled and diluted by compressed air, there is no danger of oxidation of NH3 during the stage of evaporation of NH3 water. The moisture level of exhaust gas can be lowered, thereby enabling inhibition of any drain generation in exhaust gas extraction piping. Air warming within NH3 water evaporation system can be carried out at an early stage.Type: ApplicationFiled: December 10, 2004Publication date: September 3, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Ryosuke Nakagawa, Tetsurou Hikino
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Publication number: 20090173234Abstract: An absorbing tower provided with plural spray headers (3) which each have a plurality of spray nozzles (5) and are arranged in a multi-stage state in the flow direction of exhaust gas, in which an absorption liquid containing a slurry of limestone or lime is sprayed through the nozzles (5) to absorb and remove sulfur oxide contained in exhaust gas, wherein each spray nozzle (5) is of an annular spray type (a hollow cone type) and the spray nozzles (5) in the neighborhood of the tower wall have such a structure that the fluid is sprayed radially at spray angles of 50 to 80° with the direction counter to the flow of exhaust gas as the center, while the nozzles (5) in the central part of the tower have such a structure that the fluid is sprayed radially at spray angles of 80 to 130° with the direction counter to the flow thereof as the center.Type: ApplicationFiled: March 27, 2007Publication date: July 9, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Takuro Ueda, Atsushi Katagawa, Hiroshi Ishizaka
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Patent number: 7549507Abstract: The invention relates to an inner heat insulating and inner sound insulating structure of an HRSG duct wall in which a turbine combustion high temperature and high velocity gas whose temperature is approx. 650° C. and velocity is 30 meters per second (m/s) flows, wherein heat insulating members are filled between the inner plate at the gas flow side and the outer plate at the atmospheric side, an intermediate member is disposed at a middle portion between the inner plate and the outer plate, spacing between the inner plate and the intermediate member is retained by stud bolts while spacing between the outer plate and the intermediate member is retained by stud bolts, and the stud bolt and the outer plate are tightened via a vibration deadening washer.Type: GrantFiled: August 6, 2004Date of Patent: June 23, 2009Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Kiyoshi Aida, Nobuo Shimono, Kenji Sumimori, Yasuyuki Owa, Kiyoshi Motoyama
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Publication number: 20090087805Abstract: Tertiary nozzle of port for gas injection into furnace includes a contracted flow producing channel provided obliquely toward central axis from the upstream side of gas flow so that the gas flow has a velocity component heading from the outer circumferential side of the port toward the central axis and a velocity component heading along the central axis toward the interior of the furnace, and including louver disposed for guiding so that the gas flows along the surface of throat wall of enlarged pipe configuration wherein the gas channel is enlarged at a furnace wall opening disposed at an outlet area of the contracted flow producing channel.Type: ApplicationFiled: October 27, 2006Publication date: April 2, 2009Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Yusuke Ochi, Akira Baba, Kouji Kuramashi, Hirofumi Okazaki, Masayuki Taniguchi
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Patent number: 7507381Abstract: An exhaust gas processing device includes an air preheater for preheating air for combustion in a combustion device by using an exhaust gas emitted from the combustion device; a gas-gas heater heat recovery device composed of a heat transfer tube for recovering the heat of the exhaust gas to a heat medium; a dust collector; a wet-type desulfurization device; a gas-gas heater re-heater composed of a heat transfer tube for heating the exhaust gas at its outlet by using the heat medium supplied from the gas-gas heater heat recovery device, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device.Type: GrantFiled: October 30, 2003Date of Patent: March 24, 2009Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Kouji Muramoto, Takayuki Saitou, Hiromichi Shimazu, Takanori Nakamoto, Toshio Katsube
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Patent number: 7482588Abstract: Conventionally, a coarse mesh having a same size in that a calculation cell was used regardless to whether the location is near or remote from radiation elements such as calculation cells and wall face elements. Therefore, it took very long calculation time to calculate an energy exchange between a remote location covered by a coarse mesh and a noted cell. Further, there were many non-influential cells for calculation in a location remote from a noted radiation element for radiation calculation, the calculation accuracy was low. The present invention is to propose a method of calculating radiation which is provided with a measure for completing the calculation rapidly while keeping calculation accuracy high. In that, near at a calculation cell from which radiation energy is emitted or at a calculation cell P into which radiation energy is absorbed, a small (level 0) cell is used and at a remote location from the calculation cell P, a large (level n) cell formed by combining plural small cells is used.Type: GrantFiled: March 19, 2003Date of Patent: January 27, 2009Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki KaishaInventors: Kenji Yamamoto, Osamu Itou, Masayuki Taniguchi, Hirofumi Okazaki, Taro Sakata
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Publication number: 20090007991Abstract: Disclosed is a ferritic heat-resistant steel which has the following chemical composition (by weight): C: 0.01-0.10%; Si: 0.30-1.0%; P: 0.02 or less; S: 0.010% or less; Mn: 0.2-1.2%; Ni: 0.3% or less; Cr: 8.0-11.0%; Mo: 0.1-1.2%; W: 1.0-2.5%; V: 0.10-0.30%; Nb: 0.02-0.12%; Co: 0.01-4.0%; N: 0.01-0.08%; B: not less than 0.001% and less than 0.010%; Cu: 0.3% or less; and Al: 0.010% or less, provided that the chemical composition satisfies the following equations: Mo(%)+0.5×W(%)=1.0-1.6, and C(%)+N(%)=0.02-0.15%, and which comprises a tempered martensite single-phase tissue produced by thermal refining. The steel shows an excellent long-term creep rupture strength even when used at a steam temperature around 650˚C and also has excellent steam oxidizability. When the value represented by the equation: Al(%)+0.1×Ni(%) is adjusted to 0.02 or less, the creep strength can be more stabilized.Type: ApplicationFiled: February 6, 2007Publication date: January 8, 2009Applicants: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Takashi Sato, Kohji Tamura, Toshio Fujita
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Publication number: 20080209899Abstract: An exhaust gas processing method using a device having an air preheater for preheating air for combustion in a combustion device by using an exhaust gas emitted from the combustion device; a gas-gas heater (GGH) heat recovery device composed of a heat transfer tube for recovering the heat of the exhaust gas to a heat medium; a dust collector; a wet-type desulfurization device; a gas-gas heater (GGH) re-heater composed of a heat transfer tube for heating the exhaust gas at its outlet by using the heat medium supplied from the gas-gas heater heat recovery device, which are installed in that order from the upstream to the downstream of an exhaust gas duct of the combustion device.Type: ApplicationFiled: May 8, 2008Publication date: September 4, 2008Applicant: BABCOCK-HITACHI KABUSHIKI KAISHAInventors: Kouji MURAMOTO, Takayuki SAITOU, Hiromichi SHIMAZU, Takanori NAKAMOTO, Toshio KATSUBE
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Patent number: 7392752Abstract: There is disclosed a solid fuel boiler including: a furnace including a plurality of solid fuel burners and a furnace wall to perform horizontal firing; a duct through which a part of combustion exhaust gas recirculates to a furnace from a downstream side of the furnace; heat exchanger tubes disposed on a furnace wall and in a heat recovery area of the furnace; and recirculation gas ports via which the recirculation gas is supplied to a reducing flame portion of the burners in the furnace without combining the gas with a flame in the vicinity of an outlet of the burner, so that molten ash is prevented from firmly sticking to the furnace wall and thermal NOx, fuel NOx, and unburned carbon.Type: GrantFiled: July 29, 2005Date of Patent: July 1, 2008Assignees: Hitachi, Ltd., Babcock Hitachi Kabushiki KaishaInventors: Hirofumi Okazaki, Masayuki Taniguchi, Kenji Yamamoto, Kenji Kiyama
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Patent number: 7357100Abstract: A necessary size and number of modules each obtained by housing a member including heat exchanger tube panels each comprising a heat exchanger tube bundle and headers for the heat exchanger tube bundle, an upper casing of an exhaust heat recovery boiler (HRSG), provided above the heat exchanger tube panels, heat insulators, and heat exchanger tube panel support beams provided on the upper surface of the upper casing into a transportation frame, are prepared according to design specifications of the HRSG, and side casings and a bottom casing except for the ceiling part casing are constructed in advance at a construction site of the HRSG, and the modules are suspended from above between adjacent support beams of the ceiling part to dispose the heat exchanger tube panel support beams of the modules at the set heights of the ceiling part support beams, and the support beams and the ceiling part support beams are connected and fixed via connecting steel plates, whereby the respective modules are transported to theType: GrantFiled: July 30, 2003Date of Patent: April 15, 2008Assignee: Babcock-Hitachi Kabushiki KaishaInventors: Isao Waseda, Atsuo Kawahara, Mitsugi Musashi, Toshinori Shigenaka