Patents by Inventor Kari Saviharju
Kari Saviharju 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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Patent number: 9080286Abstract: A method for treating odorous gases of a chemical pulp mill, according to which method odorous gases are combusted in a separate combustion device and flue gas generated therein is scrubbed. The scrubbed flue gas is led into a recovery boiler. The flue gas is scrubbed in a series of scrubbers wherein scrubbing solution discharged from one scrubber may be fed to a preceding scrubber.Type: GrantFiled: August 20, 2008Date of Patent: July 14, 2015Assignee: Andritz OYInventors: Esko Mattelmäki, Kari Saviharju
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Patent number: 8707911Abstract: A cooling system for air ports and other ports in furnace walls includes a cooling medium pumping system and ports provided with a cooling medium piping or channels inside the metallic port material. The liquid flow generated by the cooling medium system cools the ports. The ports are constructed of a casting material, and the ports are provided with a cooling liquid flow, which passes in a piping or pipings or channels inside the casting material of the ports.Type: GrantFiled: October 26, 2005Date of Patent: April 29, 2014Assignee: Andritz OyInventors: Kari Saviharju, Jorma Simonen, Lasse Koivisto, Markku Tanttu
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Patent number: 8640634Abstract: An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls on one or several levels of the furnace. A plurality of air ports are located at several horizontal elevations for introducing air into the furnace from an air supply. In the arrangement for the secondary air flows, at least two horizontal air levels at different elevations are arranged above the lower primary levels and below the black liquor sprayer. Secondary air is supplied from two opposite walls. The secondary air ports on each of said first and second horizontal elevations comprise air ports for each horizontal elevation that project a pattern of large air jets into the furnace from said opposite walls and said secondary air ports further comprise a plurality of secondary air ports on at least one of the elevations that project smaller air jets into the furnace.Type: GrantFiled: October 14, 2005Date of Patent: February 4, 2014Assignee: Andritz OyInventors: Kari Saviharju, Jorma Simonen, Raimo Paju, Jukka Savolainen, Esa Vihavainen
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Patent number: 8163137Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.Type: GrantFiled: April 6, 2011Date of Patent: April 24, 2012Assignee: Andritz OyInventors: Markku Tanttu, Kari Saviharju, Sirpa Du Jardin
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Publication number: 20110280762Abstract: A method for treating odorous gases of a chemical pulp mill, according to which method odorous gases are combusted in a separate combustion device and flue gas generated therein is scrubbed. The scrubbed flue gas is led into a recovery boiler. The flue gas is scrubbed in a series of scrubbers wherein scrubbing solution discharged from one scrubber may be fed to a preceding scrubber.Type: ApplicationFiled: August 20, 2008Publication date: November 17, 2011Applicant: ANDRITZ OYInventors: Esko Mattelmäki, Kari Saviharju
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Publication number: 20110240243Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.Type: ApplicationFiled: April 6, 2011Publication date: October 6, 2011Applicant: Andritz OyInventors: Markku TANTTU, Kari Saviharju, Sirpa Du Jardin
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Patent number: 7988820Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.Type: GrantFiled: July 2, 2008Date of Patent: August 2, 2011Assignee: Andritz OyInventors: Markku Tanttu, Kari Saviharju, Sirpa Du Jardin
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Patent number: 7831084Abstract: Method and system for controlling the operation of a recovery boiler or another boiler having a furnace wherein the operation is monitored by monitoring sensors, the sensors converting the acquired electromagnetic radiation to electrical signals which are conducted to image processing which forms an image of an object, such as the char bed and/or the char and/or chemicals on the furnace walls and/or deposits on boiler surfaces, based on the data from the sensors, and wherein the operation, such as burning of the char bed and/or the formation of char and/or chemicals on the furnace walls and/or the formation of deposits on boiler surfaces, is controlled with help of the image, wherein the sensors are arranged to produce sensor signals for 3D (three-dimensional) imaging, wherein the sensor signals are conducted to the image processing unit for forming a 3D image, such as an image of the bed and/or the char and/or the chemicals, and/or its shape describing derivatives, and/or temperature chart of the bed surfaceType: GrantFiled: July 11, 2005Date of Patent: November 9, 2010Assignee: Andritz OyInventor: Kari Saviharju
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Publication number: 20100101463Abstract: An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls on one or several levels of the furnace. A plurality of air ports are located at several horizontal elevations for introducing air into the furnace from an air supply. In the arrangement for the secondary air flows, at least two horizontal air levels at different elevations are arranged above the lower primary levels and below the black liquor sprayer. Secondary air is supplied from two opposite walls. The secondary air ports on each of said first and second horizontal elevations comprise air ports for each horizontal elevation that project a pattern of large air jets into the furnace from said opposite walls and said secondary air ports further comprise a plurality of secondary air ports on at least one of the elevations that project smaller air jets into the furnace.Type: ApplicationFiled: October 14, 2005Publication date: April 29, 2010Applicant: ANDRITZ OYInventors: Kari Saviharju, Jorma Simonen, Raimo Paju, Jukka Savolainen, Esa Vihavainen
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Patent number: 7661376Abstract: A spent liquor recovery boiler system including a boiler having a water/steam circulation system with superheaters and a furnace for recovering energy and chemicals from spent liquor combusted therein, the walls of the boiler are formed of a plurality of water-cooled tubes connected to the water/steam circulation system. The system is provided with at least one cavity having walls formed of water-cooled tubes connected to the water/steam circulation system, means for combusting a fuel and at least one outlet for discharging combustion gases to the boiler, the interior of the at least one cavity being provided with heat exchanger means for final superheating of the steam generated in the boiler, said heat exchanger means being connected to the superheaters of the boiler.Type: GrantFiled: June 6, 2003Date of Patent: February 16, 2010Assignee: Andritz OyInventors: Kari Saviharju, Jorma Simonen, Olli Arpalahti, Lasse Koivisto
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Patent number: 7640750Abstract: A spent liquor recovery boiler in the pulp and paper industry including a water/steam circulation system having superheaters, the circulation system connected to a steam turbine comprising a high-pressure part, and a furnace for burning spent liquor to produce flue gases, and including an upper portion through which the flue gases flow, wherein the steam/water circulation system of the recovery boiler is provided with a reheater for reheating steam from the high-pressure part of the turbine.Type: GrantFiled: April 21, 2006Date of Patent: January 5, 2010Assignee: Andritz OyInventors: Kari Saviharju, Jorma Simonen, Olli Arpalahti, Lasse Koivisto
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Publication number: 20090272339Abstract: A cooling system for air ports and other ports in furnace walls includes a cooling medium pumping system and ports provided with a cooling medium piping or channels inside the metallic port material. The liquid flow generated by the cooling medium system cools the ports. The ports are constructed of a casting material, and the ports are provided with a cooling liquid flow, which passes in a piping or pipings or channels inside the casting material of the ports.Type: ApplicationFiled: October 26, 2005Publication date: November 5, 2009Applicant: ANDRITZ OYInventors: Kari Saviharju, Jorma Simonen, Lasse Koivisto, Markku Tanttu
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Patent number: 7569200Abstract: The present invention relates to a method for reducing nitrogen oxide emissions in combustion. Fuel is combusted in a first zone, whereby nitrogen oxides are generated. Supplementary fuel is fed in another zone under reducing conditions. At the same time, the temperature is adjusted so that nitrogen oxides convert essentially to hydrogen cyanide. Finally, air is fed in for finalizing the combustion and converting the hydrogen cyanide into nitrogen.Type: GrantFiled: June 2, 2005Date of Patent: August 4, 2009Assignee: Andritz OyInventors: Edgardo Coda Zabetta, Mikko Hupa, Kari Saviharju
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Publication number: 20090139468Abstract: Method and system for controlling the operation of a recovery boiler or another boiler having a furnace wherein the operation is monitored by monitoring sensors, the sensors converting the acquired electromagnetic radiation to electrical signals which are conducted to image processing which forms an image of an object, such as the char bed and/or the char and/or chemicals on the furnace walls and/or deposits on boiler surfaces, based on the data from the sensors, and wherein the operation, such as burning of the char bed and/or the formation of char and/or chemicals on the furnace walls and/or the formation of deposits on boiler surfaces, is controlled with help of the image, wherein the sensors are arranged to produce sensor signals for 3D (three-dimensional) imaging, wherein the sensor signals are conducted to the image processing unit for forming a 3D image, such as an image of the bed and/or the char and/or the chemicals, and/or its shape describing derivatives, and/or temperature chart of the bed surfaceType: ApplicationFiled: July 11, 2005Publication date: June 4, 2009Applicant: ANDRITZ OYInventor: Kari Saviharju
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Publication number: 20090014137Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.Type: ApplicationFiled: July 2, 2008Publication date: January 15, 2009Applicant: Andritz OyInventors: Markku Tanttu, Kari Saviharju, Sirpa Du Jardin
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Publication number: 20080289782Abstract: A method for burning chlorine-containing liquors in a chemical recovery boiler at a pulp mill, wherein the recovery boiler includes spent liquor sprayers for feeding spent liquor and a number of combustion air levels including: increasing a combustion temperature in the recovery boiler in a burning zone where a chlorine-containing liquor or a chlorine-containing effluent is burned; while burning the liquor or effluent, volatilizing the chlorine in the liquor or effluent to produce chloride-containing salts in flue gases in the boiler, and removing the chloride-containing salts from the flue gases.Type: ApplicationFiled: April 23, 2008Publication date: November 27, 2008Applicant: ANDRITZ OYInventors: Kari Saviharju, Heikki Jaakkola, Janne Vehmaa
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Publication number: 20070231231Abstract: The present invention relates to a method for reducing nitrogen oxide emissions in combustion. Fuel is combusted in a first zone, whereby nitrogen oxides are generated. Supplementary fuel is fed in another zone under reducing conditions. At the same time, the temperature is adjusted so that nitrogen oxides convert essentially to hydrogen cyanide. Finally, air is fed in for finalizing the combustion and converting the hydrogen cyanide into nitrogen.Type: ApplicationFiled: June 2, 2005Publication date: October 4, 2007Applicant: ANDRITZ OYInventors: Edgardo Coda Zabetta, Mikko Hupa, Kari Saviharju
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Patent number: 7207280Abstract: An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls at one or several levels of the furnace. A plurality of air ports are located at several horizontal levels for introducing air into the furnace from an air supply. In the arrangement for the secondary air flows, two horizontal air levels at different elevations are arranged above the lower primary levels and below the black liquor sprayer. Secondary air is supplied from two opposite walls and the air ports from each of the two levels are located so that the air jets are introduced in an interlaced pattern having an even number of jets on one opposite wall and an uneven number of jets on the other opposite wall. The air jets of said at least two air levels are located substantially one above each other in substantially vertical rows.Type: GrantFiled: December 30, 2003Date of Patent: April 24, 2007Assignee: Andritz OyInventors: Kari Saviharju, Jorma Simonen, Liisa Simonen, Esa Vakkilainen, Esko Mattelmaki
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Publication number: 20060236696Abstract: A spent liquor recovery boiler in the pulp and paper industry including a water/steam circulation system having superheaters, the circulation system connected to a steam turbine comprising a high-pressure part, and a furnace for burning spent liquor to produce flue gases, and including an upper portion through which the flue gases flow, wherein the steam/water circulation system of the recovery boiler is provided with a reheater for reheating steam from the high-pressure part of the turbine.Type: ApplicationFiled: April 21, 2006Publication date: October 26, 2006Applicant: ANDRITZ OYInventors: Kari Saviharju, Jorma Simonen, Olli Arpalahti, Lasse Koivisto
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Publication number: 20050252458Abstract: A spent liquor recovery boiler system including a boiler having a water/steam circulation system with superheaters and a furnace for recovering energy and chemicals from spent liquor combusted therein, the walls of the boiler are formed of a plurality of water-cooled tubes connected to the water/steam circulation system. The system is provided with at least one cavity having walls formed of water-cooled tubes connected to the water/steam circulation system, means for combusting a fuel and at least one outlet for discharging combustion gases to the boiler, the interior of the at least one cavity being provided with heat exchanger means for final superheating of the steam generated in the boiler, said heat exchanger means being connected to the superheaters of the boiler.Type: ApplicationFiled: June 6, 2003Publication date: November 17, 2005Applicant: Andritz OYInventors: Kari Saviharju, Jorma Simonen, Olli Arpalahti, Lasse Koivisto