Patents by Inventor Lars Olausson
Lars Olausson 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: 10981080Abstract: The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with one or several protrusions/indentations forming a multitude of stamped bumps (SB) on the envelope surface of a heat transfer tube such that the distance between adjacent stamped bumps (SB) along a line on the envelope surface parallel to the longitudinal axis of the heat transfer tube is within the range of 3 to 250 mm, said stamped bumps (SB) having a height (hp) in the range 0.3 to 5.0 mm, a width (wp) in the range 1.Type: GrantFiled: February 2, 2018Date of Patent: April 20, 2021Assignee: VALMET ABInventor: Lars Olausson
-
Patent number: 10926189Abstract: The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with at least one weld ridge (WR; WR1, WR2), said weld ridge having a height (h; h2) in the range 0.3 to 5.0 mm, a width (w; w2) in the range 0.Type: GrantFiled: February 1, 2018Date of Patent: February 23, 2021Assignee: VALMET ABInventors: Lars Olausson, Krister Pettersson, Martin Apel, Mattias Gourdon, Anders Åkesjö
-
Publication number: 20200024802Abstract: The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with one or several protrusions/indentations forming a multitude of stamped bumps (SB) on the envelope surface of a heat transfer tube such that the distance between adjacent stamped bumps (SB) along a line on the envelope surface parallel to the longitudinal axis of the heat transfer tube is within the range of 3 to 250 mm, said stamped bumps (SB) having a height (hp) in the range 0.3 to 5.0 mm, a width (wp) in the range 1.Type: ApplicationFiled: February 2, 2018Publication date: January 23, 2020Applicant: VALMET ABInventor: Lars OLAUSSON
-
Publication number: 20190366228Abstract: The invention relates to a heat transfer tube (9) for falling film evaporation having a heating medium surface (21) to be heated by a heating medium, a falling film surface (20) to have spent liquor passing over it, and being made from an iron based high alloy stainless steel material with an alloy content above 16.00% for Chromium and above 1% for Nickel. The falling film surface of the heat transfer tube is equipped with at least one weld ridge (WR; WR1, WR2), said weld ridge having a height (h; h2) in the range 0.3 to 5.0 mm, a width (w; w2) in the range 0.Type: ApplicationFiled: February 1, 2018Publication date: December 5, 2019Applicant: VALMET ABInventors: Lars OLAUSSON, Krister PETTERSSON, Martin APEL, Mattias GOURDON, Anders ÅKESJÖ
-
Patent number: 8888955Abstract: The method and equipment are for the evaporation of hot black liquor obtained from a digestion process during the production of cellulose pulp. The black liquor is led to a multistage evaporation line with at least five evaporation stages. The black liquor that is to undergo evaporation in the evaporation line is cooled in at least one heat exchange process in a heat exchanger (HE1) against the partially evaporated black liquor that has undergone evaporation in at least one stage (I). The black liquor that is to undergo evaporation is cooled and the partially evaporated black liquor is heated by at least 5-10° C. The risk for the formation of foam and the separation of methanol are reduced. The greater part of the evaporation takes place at low temperature and at the lowest level of dry matter content in the liquor, which also suppresses encrustation in the stage.Type: GrantFiled: October 26, 2007Date of Patent: November 18, 2014Assignee: Valmet Power ABInventor: Lars Olausson
-
Publication number: 20100071862Abstract: The method and equipment are for the evaporation of hot black liquor obtained from a digestion process during the production of cellulose pulp. The black liquor is led to a multistage evaporation line with at least five evaporation stages. The black liquor that is to undergo evaporation in the evaporation line is cooled in at least one heat exchange process in a heat exchanger (HE1) against the partially evaporated black liquor that has undergone evaporation in at least one stage (I). The black liquor that is to undergo evaporation is cooled and the partially evaporated black liquor is heated by at least 5-10° C. The risk for the formation of foam and the separation of methanol are reduced. The greater part of the evaporation takes place at low temperature and at the lowest level of dry matter content in the liquor, which also suppresses encrustation in the stage.Type: ApplicationFiled: October 26, 2007Publication date: March 25, 2010Inventor: Lars Olausson
-
Patent number: 6395171Abstract: The strainer arrangement is adapted for straining a liquid from a mixing arrangement, such as a mixing tank, containing black liquor including solid particles of ash. The strainer arrangement comprises a strainer pipe with axial gaps defined therein for permitting a radial inflow of liquid into the strainer pipe. An axially movable shaft is disposed inside the strainer pipe and has cleaning pins attached thereto that extend into the gaps.Type: GrantFiled: July 7, 1999Date of Patent: May 28, 2002Assignee: Kvaerner Pulping ABInventors: Gustav Carlsson, Tommy Eriksson, Christer Isaksson, Sven-Erik Jansson, Lennart Lindau, Bengt Nyman, Lars Olausson, Hans Sjöberg, Jan Bergman
-
Patent number: 6210455Abstract: An evaporation apparatus for evaporation of, for example, spent liquor from pulp cooking. The apparatus has a vertical cylinder that has evaporation surfaces disposed therein. An outlet opening is defined in a widened part of the cylinder to receive driven-off steam. A skirt is disposed in the cylinder and surrounds the evaporated liquid and driven-off steam and has a diameter that is smaller than a diameter of the widened part. The skirt has an open bottom and a skirt opening is defined in a portion of the skirt that is facing away from the outlet opening.Type: GrantFiled: April 9, 1999Date of Patent: April 3, 2001Assignee: Kvaerner Pulping ABInventors: Lars Olausson, Michael Thiede, Olle Wennberg, Anders Wernqvist, Martin Collander
-
Patent number: 5944950Abstract: The process for the final evaporation has at least two evaporation appliances. These appliances are coupled in series with respect to the black liquor and in parallel with the live steam (primary steam), which drives the evaporation, and with the secondary steam that is generated by the evaporation. The pressure of the primary steam that is supplied to the appliance(s) where the liquor concentration is at the highest concentration is greater than the pressure of the primary steam supplied to the other appliances where the liquor concentration is not so high.Type: GrantFiled: June 27, 1997Date of Patent: August 31, 1999Assignee: Kvaerner Pulping ABInventors: Lars Olausson, Olle Wennberg
-
Patent number: 5771817Abstract: A recovery boiler for combusting spent liquor from cellulose cooking while at the same time recovering chemicals. The recovery boiler is constructed for so-called "rotafire" combustion and the speed of rotation of the secondary air has been increased by a constriction of the boiler being arranged at the tertiary air level. The invention also includes a process for using the boiler which is based on certain ports through which the secondary air is blown in being provided with air which is at a higher pressure than that at the other ports on the same level, thereby achieving a higher inflow velocity than from the other ports.Type: GrantFiled: December 17, 1996Date of Patent: June 30, 1998Assignee: Kvaerner Pulping ABInventors: Lars Olausson, Jan Bergman, Sven-Erik Jansson, Agneta Larsson
-
Patent number: 5454908Abstract: The invention relates to a method of firing black liquor in recovery boilers where the intention is to obtain fumes having a low content of nitrogen oxides (NO.sub.x). A part of the combustion air is added as a last portion at a very high level so that a reducing atmosphere will exist in a very great part of the boiler for a long time period, e.g. at least 3-5 seconds.Type: GrantFiled: August 27, 1993Date of Patent: October 3, 1995Assignee: Gotaverken Energy ABInventor: Lars Olausson
-
Patent number: 4796546Abstract: A combustion plant includes a circulating fluid bed, which is maintained by the supply of fuel, inert material and oxygen-containing fluidizing gas to a vertical furnace shaft. This is, at its upper end provided with an outlet for combustion gases and bed materials, which is separated from gas in a separating means, and by way of a lock is returned to the furnace shaft. The separating means is of a mechanical type, and located vertically above a further vertical shaft communicating with the lock. The further shaft encloses distribution means for the particles and a heat exchanger for cooling the particles falling from the gas stream, before they are re-introduced into the furnace shaft by way of the lock.Type: GrantFiled: July 31, 1987Date of Patent: January 10, 1989Assignee: Gotaverken Energy Systems ABInventors: Ola Herstad, Lars Olausson