Patents by Inventor Vidar Snekkenes
Vidar Snekkenes 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: 20040060672Abstract: A method for the continuous cooling of chemical pulp with the aim of achieving improved heat economy in a digester system comprising a vessel (1) for impregnation and a vessel (2) for cooking the impregnated cellulose chips. A part of the black liquor (14) withdrawn from the digester (2) is added at the beginning of a transfer system (4) having maintained essentially the withdrawl temperature, increasing the temperature of the chips mixture in the transfer system (4). A fraction of the transport fluid (10) from the transfer system (4) that is continuously withdrawn from the impregnated chips fed into the top of the digester is returned to the impregnation vessel (1) at essentially maintained transfer temperature, at a location before the said transfer system (4), seen from the point of view of the direction of flow of the chips.Type: ApplicationFiled: October 22, 2003Publication date: April 1, 2004Inventors: Vidar Snekkenes, Lennart Gustavsson
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Patent number: 6699357Abstract: The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp. Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the bottom of the digester (1), via a line (8) in which the pulp is maintained at substantially the same pressure level, to a pressurized wash (7). More than 50% of the used cooking liquor (black liquor) which is extracted from the system in total is extracted from the wash filtrate of the pressurized wash. The pressurized wash is regulated so that a high temperature is maintained in the wash filtrate. The extraction is regulated so that a net co-current flow is established at the bottom of the digester.Type: GrantFiled: September 28, 2001Date of Patent: March 2, 2004Assignee: Kvaerner Pulping ABInventors: Vidar Snekkenes, Lennart Gustavsson, Sven-Erik Olsson
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Patent number: 6605180Abstract: Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the bottom of the digester, via a line in which the pulp is maintained at substantially the same pressure level, to a pressurized wash. More than 50% of the used cooking liquor (black liquor) which is extracted from the system in total is extracted from the wash filtrate of the pressurized wash. At the same time a small portion of the wash filtrate is also to be recirculated to the bottom of the digester as dilution liquid. The pressurized wash is regulated so that a high temperature is maintained in the wash filtrate. The extraction is regulated so that a net co-current flow is established at the bottom of the digester.Type: GrantFiled: September 28, 2001Date of Patent: August 12, 2003Inventors: Vidar Snekkenes, Lennart Gustavsson, Sven-Erik Olsson
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Publication number: 20030000660Abstract: The invention relates to an improved method for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. According to the invention high pressure can be established in the vapour phase largely by means of steam, without risk of attaining excessively high temperatures in the cooking. Nor is there any risk of foaming incurred in connection with pressure relief of pressurized cooking liquor, which often ensues in vapour phase digesters when the pressure is maintained by means of air supplied to the vapour phase. These problems are effectively avoided by introducing a temperature-controlled supply of cooking liquor in close proximity to the surface of the liquor level, as a result of which a protective liquor surface with a temperature lower than the vapour phase can be obtained.Type: ApplicationFiled: June 19, 2002Publication date: January 2, 2003Inventors: Lennart Gustavsson, Vidar Snekkenes
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Publication number: 20020079071Abstract: The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp.Type: ApplicationFiled: September 28, 2001Publication date: June 27, 2002Applicant: Kvaerner Pulping AB;Inventors: Vidar Snekkenes, Lennart Gustavsson, Sven-Erik Olsson
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Publication number: 20020079070Abstract: The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp.Type: ApplicationFiled: September 28, 2001Publication date: June 27, 2002Applicant: Kvaerner Pulping ABInventors: Vidar Snekkenes, Lennart Gustavsson, Sven-Erik Olsson
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Patent number: 6361649Abstract: A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means of a transfer circulation, which partly, via a feed line (25), feeds the chips from an outlet end (27) of the impregnation vessel to the top of the digester for separation of free liquid in a separator (28), and partly, via a return line (26), feeds separated liquid from the top of the digester to the outlet end of the impregnation vessel for use as transfer liquid for the impregnated chips, besides which cooking liquid is added to the chips in the top of the digester. According to the invention, as a first part, less than 100%, preferably less than 95% and more preferred less than 90% of the liquid which is separated from the chips in the transfer circulation, is recirculated to be used as transfer liquid.Type: GrantFiled: December 11, 2000Date of Patent: March 26, 2002Assignee: Kvaerner Pulping ABInventor: Vidar Snekkenes
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Patent number: 6332954Abstract: A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means of a transfer circulation, which partly, via a feed line (25), feeds the chips from an outlet end (27) of the impregnation vessel to the top of the digester for separation of free liquid in a separator (28), and partly, via a return line (26), feeds separated liquid from the top of the digester to the outlet end of the impregnation vessel for use as transfer liquid for the impregnated chips, besides which cooking liquid is added to the chips in the top of the digester. According to the invention, as a first part, less than 100%, preferably less than 95% and more preferred less than 90% of the liquid which is separated from the chips in the transfer circulation, is recirculated to be used as transfer liquid.Type: GrantFiled: December 11, 2000Date of Patent: December 25, 2001Assignee: Kvaerner Pulping ABInventor: Vidar Snekkenes
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Patent number: 6332950Abstract: A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production. The fibrous material is fed through a low pressure system that has a gas phase part followed by a liquid phase part. The liquid phase part includes a low pressure circulation where a circulating liquid is withdrawn from the fibrous material and recirculated back to the fibrous material in an upstream position. The fibrous material is sluiced into a high pressure system that has a liquid phase transfer part operatively connected to a digester. A hot process liquid and/or the circulating liquid are evaporatively cooled by being allowed to flash within the low pressure system.Type: GrantFiled: December 17, 1999Date of Patent: December 25, 2001Assignee: Kaverner Pulping ABInventors: Vidar Snekkenes, Lennart Gustavsson
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Patent number: 6325889Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.Type: GrantFiled: December 14, 2000Date of Patent: December 4, 2001Assignee: Kvaerner Pulping ABInventors: Vidar Snekkenes, Johan Engström, Sven-Erik Ohlsson, Per Nyström, Sören Söderqvist, Björn Karlsson
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Publication number: 20010037865Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.Type: ApplicationFiled: December 14, 2000Publication date: November 8, 2001Applicant: Kvaerner Pulping ABInventors: Vidar Snekkenes, Johan Engstrom, Sven-Erik Ohlsson, Per Nystrom, Soren Soderqvist, Bjorn Karlsson
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Patent number: 6280567Abstract: The invention relates to a process system and a method for preliminary treatment of disintegrated cellulose-containing material, preferably wood chips, prior to pulp digestion. The process system and the method according to the invention make use of a process vessel intended to function both as a so-called chip bin and as a pre-impregnation vessel. The characteristics of the invention are that a sloping steaming vessel is arranged downstream of the process vessel for the purpose of separating an excess of pre-impregnation liquid from the pre-impregnated cellulose-containing material, that the sloping steaming vessel is arranged for supplying steaming vapor which preferably has been generated by flashing of extraction liquor from a pulp digester, and that the sloping steaming vessel is connected to a chip chute communicating with a condenser for connection to a system for managing foul-smelling process gases.Type: GrantFiled: April 12, 2000Date of Patent: August 28, 2001Assignee: Kvaerner Pulping ABInventors: Lennart Gustavsson, Johan Engstrom, Vidar Snekkenes
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Patent number: 6254723Abstract: In a single-vessel system for continuous cooking of kraft pulp, chips and liquor are conveyed from a high pressure feeder in a transfer line to a first end of a digester. A part of the liquor is separated from the chips that are withdrawn from an outlet defined in an upper part of the digester and conveyed in a return line to the high pressure feeder. A constituent flow of liquor is led from the return line and heated and fed via one or more inlets into the digester at a location that is downstream of the outlet for the return line.Type: GrantFiled: December 13, 1999Date of Patent: July 3, 2001Assignee: Kvaerner Pulping ABInventors: Vidar Snekkenes, Lennart Gustavsson
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Publication number: 20010000588Abstract: A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means of a transfer circulation, which partly, via a feed line (25), feeds the chips from an outlet end (27) of the impregnation vessel to the top of the digester for separation of free liquid in a separator (28), and partly, via a return line (26), feeds separated liquid from the top of the digester to the outlet end of the impregnation vessel for use as transfer liquid for the impregnated chips, besides which cooking liquid is added to the chips in the top of the digester. According to the invention, as a first part, less than 100%, preferably less than 95% and more preferred less than 90% of the liquid which is separated from the chips in the transfer circulation, is recirculated to be used as transfer liquid.Type: ApplicationFiled: December 11, 2000Publication date: May 3, 2001Applicant: Kvaerner Pulping ABInventor: Vidar Snekkenes
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Patent number: 6214171Abstract: A method in connection with continuous cooking of chips that comprises impregnating the chips with a impregnation liquid in an impregnation vessel and cooking the impregnated chips in a digester. The impregnation vessel and digester are connected to one another by means of a transfer circulation, which partly, via a feed line feeds the chips from an outlet end of the impregnation vessel to the top of the digester for separation of a free liquid in a separator. The separated liquid from the top of the digester is, partly, via a return line fed to the outlet end of the impregnation vessel for use as a transfer liqid for the impregnated chips to which cooking liquid is added to the chips at the top of the digester. Less than 100%, preferably less than 95%, and more preferred less than 90% of the liquid that is separated from the chips in the transfer circulation is recirculated to the used as transfer liquid.Type: GrantFiled: August 6, 1999Date of Patent: April 10, 2001Assignee: Kvaerner Pulping ABInventor: Vidar Snekkenes
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Patent number: 6203662Abstract: This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy, and, at the same time, achieving very good pulp properties.Type: GrantFiled: February 17, 1998Date of Patent: March 20, 2001Assignee: Kvaerner Pulping ABInventors: Vidar Snekkenes, Johan Engström, Krister Olsson, Mikael Lindström, Christofer Lindgren, Sören Gustavsson
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Patent number: 6171494Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.Type: GrantFiled: February 17, 1998Date of Patent: January 9, 2001Assignee: Kvaener Pulping ABInventors: Vidar Snekkenes, Johan Engström, Sven-Erik Ohlsson, Per Nyström, Sören Söderqvist, Björn Karlsson
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Patent number: 6159336Abstract: This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy, and, at the same time, achieving very good pulp properties.Type: GrantFiled: October 29, 1997Date of Patent: December 12, 2000Assignee: Kvaerner Pulping ABInventors: Johan Engstrom, Vidar Snekkenes, Krister Olsson, Mikael Lindstrom, Christofer Lindgren, Soren Gustavsson
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Patent number: 6123807Abstract: This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties.Type: GrantFiled: August 7, 1997Date of Patent: September 26, 2000Assignee: Kvaerner Pulping ABInventors: Johan Engstrom, Vidar Snekkenes, Krister Olsson, Soren Gustavsson, Christofer Lindgren, Mikael Lindstrom
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Patent number: 6086717Abstract: A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time achieve very good pulp properties. The digesting process includes a top separator that separates the transport liquid from the fiber material and permits the fiber material to be exposed to the cooking liquid.Type: GrantFiled: January 15, 1998Date of Patent: July 11, 2000Assignee: Kvaerner Pulping ABInventors: Vidar Snekkenes, Sven-Erik Olsson