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Valmet Ab patents


Recent patent applications related to Valmet Ab. Valmet Ab is listed as an Agent/Assignee. Note: Valmet Ab may have other listings under different names/spellings. We're not affiliated with Valmet Ab, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "V" | Valmet Ab-related inventors


Cyclone separator arrangement and method

A cyclone separator (10) comprises a pressure chamber (20), an inlet (30) for an incoming flow of a mixture of gas and particles, a gas outlet (50) for outgoing gas arranged through a top wall (26) of the pressure chamber and a particle outlet (40) for outgoing particles arranged in a lower part (22) of the pressure chamber. The pressure chamber has a main rotation symmetric shape. ... Valmet Ab

A discharge valve with a detachable inner lining

A discharge valve is disclosed which includes a valve housing which can be functionally connected to a process element having a pressurized interior space. The valve housing includes a flow channel having a longitudinal center axis (a) and is in working cooperation with a valve member. ... Valmet Ab

Refiner plate segment with pre-dam

The invention relates to a refiner plate segment in a refiner plate for mechanically refining of lignocellulosic material in a refiner, said refiner plate segment comprising at least a first, generally radially extending bar, a second, generally radially extending bar, a groove arranged and defined between said first, generally radially extending bar and said second, generally radially extending bar, and a main dam, which has a height h and is arranged in the groove, wherein a pre-dam is arranged in front of the main dam, said pre-dam has a height h which is less than the height h of the main dam.. . ... Valmet Ab

Method for producing high purity lignin

The method is for separation of lignin from original black liquor (blin) that has a first precipitation stage (pr) for precipitation of lignin by a first acidification using acidifier ac1, preferably using co2, at alkaline conditions, then separating a lignin cake with subsequent suspension of the lignin cake in a strong acid in order to leach our metals from the lignin followed by dewatering and obtaining a clean lignin product lp. The process further is improved by intensified hydrolysis of lignin cake such that most of the carbohydrates are broken down to dissolvable monomers that could be separated from the lignin in the filtrate from a filtering stage subsequent to the hydrolysis. ... Valmet Ab

Profile bar screen for digester vessels

The invention relates to an improved profile bar screen for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel. According to the invention is a profile bar screen designed with horizontal support arches 11 with integrated support shoulders 12 only at the outer ends of the support arch which support shoulders rest against the inside of the vessel wall 1. ... Valmet Ab

Cost efficient kraft cooking method using polysulfide cooking liquor

The invention is related to a method for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor. In order to obtain a cost efficient system both in aspects of investment costs but also in aspects of heat economy of operating the process is most of the total charge of alkali charged as heated polysulfide liquor to an first atmospheric vessel, wherein the hot polysulfide liquor flashes off steam providing most if not all of the necessary steaming effect for the cellulose material. ... Valmet Ab

Welding head for magnetic pulse welding of tubular profiles to a cylindrical inner member

The invention relates to a welding head for magnetic pulse welding of hollow thin-walled profile to an inner member having a complementary outer form to said hollow thin-walled profile. The weld head comprises two movable weld head halves (10a,10b) forming said weld head wherein each half has at least one individual induction coil (12a,12b) connected to a power source independently from the other weld head half, with coils wound in a kidney-shape. ... Valmet Ab

Plug screw feeder, feeder arrangement and system for treatment of lignocellulosic biomass material

A plug screw feeder (1) comprises a plug screw (10) with a thread (12) and a plug screw housing (20) surrounding the plug screw. The plug screw housing comprises an inlet opening (24) in a side of the plug screw and in a vicinity of a first axial end (18) of the plug screw. ... Valmet Ab

Arrangement and system for a treatment process

An arrangement for feeding and dewatering lignocellulosic material in a hydrolysis process between a first reactor unit, where the material is partly hydrolyzed, to a second reactor unit, wherein the first reactor unit operates at a first pressure and the second reactor unit operates at a second pressure being higher than the first pressure. The arrangement includes a first plug screw feeder arranged to receive the partly hydrolyzed material from the first reactor unit and being arranged to compress, dewater and transport the material, wherein the first screw feeder is arranged to operate at a pressure being higher than the first pressure. ... Valmet Ab

A steam separation unit for a system for hydrolysis of lignocellulosic biomass material

A steam separation unit for separation of steam from lignocellulosic biomass material in a hydrolysis process includes a treatment vessel including a separation section and a biomass collection section. The separation section is arranged with at least one inlet for receiving at least partly hydrolyzed biomass material mixed with steam and at least one control outlet for discharging the steam from the vessel. ... Valmet Ab

Method of producing dissolving pulp from lignocellulosic material

The present invention relates to an improved process for producing dissolving pulp from a hydrolysis-kraft cooking process, and wherein production increases may result in less viscosity reduction and thus not meeting the target viscosities in the dissolving pulp produced. In order to compensate for losses in viscosity reduction in the cook at production increases is the oxygen delignification stage boosted with modest charges of peroxide that introduce an additional viscosity reduction.. ... Valmet Ab

Biomass treatment system

In an outlet flow control arrangement (1) arrangeable to control a flow of material through an outlet (2) with a predetermined diameter arranged at an end of a pressurized processing container (3), the outlet flow control arrangement (1) comprises an adaptor unit (4) configured so that a cross-section of a flow into the adaptor unit (4) is reduced as compared to a cross-section of the outlet (2), to enable the adaptor unit (4) to control and center a flow of processed material out of the processing container (3) and through the outlet (2) into a discharge pipe (5).. . ... Valmet Ab

Arrangement for feeding comminuted material using a plug screw feeder

A feeding arrangement for feeding comminuted material to a treatment stage using a plug screw feeder. The invention relates to a design of the inlet to the plug screw feeder wherein, at least 2 chutes (20a,20b) are arranged to feed material to the feed screw (10), and that the cross section of each chute is arranged such that more than 50% of the outlet cross section of a first chute (20a) is located on one side of the feed screw axis (cc) and more than 50% of the outlet cross section of a second chute (20b) is located on the other side of the feed screw axis. ... Valmet Ab

Method and arrangement for fiber flow equalization in a refiner

A refiner segment (1) for a refiner intended for defibrating lignocellulose-containing material has a refining surface comprising a group of first bars (10) and second bars (20), each first and second bar having a first end (10-1, 20-1) directed in the direction of an inlet zone (2) of the refiner segment and a second end (10-2, 20-2) directed in the direction of a refining zone (3) of the refiner segment, where the second ends (10-2) of the first bars (10) are interlaced with the first ends (20-1) of the second bars (20) to form first grooves (30-1) between the first bars (10), and second grooves (30-2) between the second bars (20). The second ends (10-2) of the first bars (10) have a respective guiding surface (r1) decreasing from an upper surface of the first bars down towards the bottom of the second grooves (30-2), and the first ends (20-1) of the second bars (20) have a respective guiding surface (r2) increasing from the bottom of the first grooves (30-1) up to an upper surface of the second bars (20), such that the guiding surfaces (r1, r2) form an equalization groove (40) substantially across the first and second bars (10, 20), wherein the equalization groove (40) is configured to buffer and distribute a flow of material from the first grooves (30-1) into one or more of the second grooves (30-2).. ... Valmet Ab

01/26/17 / #20170022663

Kraft cooking method using polysulfide cooking liquor

The method is for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor. In order to increase carbohydrate stabilization and hence the yield from a kraft cooking process a first impregnation stage using polysulfide cooking liquor is implemented at high alkali and polysulfide concentration and at a low temperature. ... Valmet Ab








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