A. Ahlstrom Corporation

Sulzer Management Ag

Ahlstrom Corporation

Andritz Oy

Ahlstrom Machinery, Inc.

Sulzer Pumpen Ag

Andritz-ahlstrom Oy

Reijo Vesala

Vesa J Vikman

Jukka Timperi

Voitto Reponen

Kari Peltonen

Jorma Elonen

Tapio Peroaho

Toivo J Niskanen

Heikki Manninen

Arto Koso

Anssi Lehtonen

Harold Haavik

Jussi Heinonen

Matti Manninen

Janne Tamminen

Pasi Kvick

Karl Peltonen

Karl-Erik Röberg

Seppo Nyman

Vesa Wikman

An arrangement for and a method of biomass hydrolysis includes a feed pump, a pre-hydrolysis reactor and a feed line there-between for feeding fresh biomass slurry to the pre-hydrolysis reactor. The feed pump is a centrifugal feed pump and the pre-hydrolysis reactor is an upflow reactor.

Method of and arrangement for treating biomass

An impeller structure for a centrifugal pump that can feed both fibrous suspensions and water into a headbox of a fibrous web machine. The centrifugal pump utilizing the impeller structure pumps stock for both liquid-laid and foam-laid paper, tissue or board making applications and pumps water or other dilution fluid into a headbox circulation. In general, the impeller of the present invention is especially suitable for all such pumping tasks in the production of fibrous webs that a pulseless or low-pulse impeller is needed.

Impeller for a centrifugal headbox feed pump

A method of installing a probe for monitoring a surface level of a fluid in a vessel inside the vessel from outside the vessel, the method includes providing a vessel side wall with a first opening, providing the vessel side wall with a second opening, passing the second end of the probe, a second device for fastening the probe and a detection unit of the probe through the first opening and inside the vessel, orienting the second end of the probe towards the second opening, attaching the second end of the probe to the side wall of the vessel at the second opening, and fastening the first end of the probe to the side wall of the vessel at the first opening.

Probe for monitoring the surface level of a fluid in a vessel and a method of installing the probe in the vessel

The present invention relates to a method of and an arrangement for transferring a process liquid from a washing and thickening device to a subsequent process stage. In accordance with an advantageous embodiment of the present invention, the method and the arrangement are applicable, for example, in transferring fiber suspensions or pulps from washing and thickening device to a subsequent process stage in pulp and paper making industry such that the dilution of pulp after a washing and thickening device is performed in a stand pipe () below the surface level control range.

Method of and an arrangement for transferring a process liquid, an industrial facility and a method of simplifying the layout of such

A method of and an arrangement for introducing fiber suspension or pulp from a pulp vessel to a washing and/or filtering apparatus is based on simultaneous division and degassing of pulp at immediately upstream of the washing and/or filtering apparatus.

Method of and an arrangement for introducing process liquid from a treatment step to a washing and/or filtering apparatus

A method and an apparatus for mixing a first fluid with a second fluid. The apparatus has a mixing chamber, and a turbine chamber. The mixing chamber has a mixer rotor, and an inlet channel, through which the first fluid is introduced from a pipeline. The turbine chamber has an inlet conduit for the second fluid, and a turbine wheel, connected operatively to the mixer rotor. The first fluid is introduced into the mixing chamber from the pipeline. The second fluid is introduced into the turbine chamber to thereby rotate the turbine wheel by a motive force of the second fluid. The rotation of the turbine wheel imparts rotation to the mixer rotor, thus affecting the mixing of the second fluid into said first fluid. The second fluid is discharged from the turbine chamber to the mixing chamber, where the first and second fluids are mixed.

Method and apparatus for mixing a first fluid with a second fluid in a mixing chamber connected to a turbine chamber

The present invention relates to a method of and an arrangement for transferring a process liquid from a washing and thickening device to a subsequent process stage. In accordance with an advantageous embodiment of the present invention, the method and the arrangement are applicable, for example, in transferring fibre suspensions or pulps from washing and thickening device to a subsequent process stage in pulp and paper making industry such that the dilution of pulp after a washing and thickening device is performed in a stand pipe () below the surface level control range.

The present invention relates to a method, an apparatus and a rotor for homogenizing a medium. The invention may be utilized in all areas of industry where mere homogenization of a medium or mixing of at least two flowing media is needed. A preferred application of the invention can be found in pulp and paper making industry where various chemicals have to be mixed with fiber suspensions. A characterizing feature of the invention is the symmetry of the homogenizing operation in the homogenizing chamber.

Method, an apparatus and a rotor for homogenizing a medium

A method and apparatus is disclosed for pumping a material, especially thick, gas-containing, fiber suspensions for wood processing. The apparatus includes a centrifugal pump with a rotor having blades twisted such that the pitch of the blade changes along the length of the rotor.

Method and apparatus for pumping a material and a rotor for use in connection therewith

A method and apparatus for heating cellulose pulp with steam are provided. Low-pressure (e.g. 3-5 bar (abs.)) steam is supplied into the pulp flowing as a plug flow in such a way that in the flow direction of the pulp, before supplying the low-pressure steam, the pulp is pressurized so that the pulp pressure at the point of the steam introduction is lower than the pressure of the available steam. After the steam is introduced the pulp is mixed with a pressure-raising mixer (such as a fluidizing centrifugal pump) to divide the steam evenly into the pulp and/or to equalize the temperature of the pulp.

Method for heating pulps

The present invention relates to a method and an apparatus for mixing a pulp suspension with a fluid medium. The method and the apparatus according to the invention are particularly advantageous when used for mixing different chemicals, both liquid and gaseous, or steam into pulp suspension in the wood processing industry. In the method and the apparatus according to the invention, the pulp suspension and the fluid medium are fed into a mixer casing, mixed therein and removed from the casing, and a freely rotatable mixing rotor with mixing blades, is placed within the casing and turned by means of incoming flow of pulp suspension being in contact with the mixing blades of the rotor.

Method and apparatus for mixing pulp a suspension with a fluid medium with a freely rotatable mixing rotor

A centrifugal and vacuum pump combination in which the impeller of a centrifugal pump is disposed on the same shaft as a rotor of the vacuum pump, with a gas outlet extending between the centrifugal and vacuum pumps, is operated by positively controlling the flow of gas passing through the gas outlet duct, for example by changing the effective cross-sectional flow area of the outlet duct. The fluent material handled by the pump is preferably a cellulose fiber slurry having a solids consistency of between about 6-15%. The control can be effected automatically in response to solids consistency, inlet pressure, and/or gas content of the slurry being pump. The vacuum pump housing includes an eccentric inner wall, and operation of the pump may be primarily controlled by moving the vacuum pump housing.

Gas separation control in a centrifugal pump/vacuum pump

Gas separation control in a centrifugal pump vacuum pump

A method and apparatus allow large volumes of gas (at least about 10% by volume) to be mixed into a cellulosic fiber suspension having a consistency of about 8-25%. The mixing of ozone containing gas into the suspension is particularly desirable. The suspension is passed into the inlet of a mixer, gas is introduced into the mixer, and the gas and fiber suspension are homogenized by fluidizing the gas and suspension. The flow of suspension through the mixer is throttled so that the effect of the fluctuation and pressure between the inlet and outlet is minimized, and the homogeneously mixed gas and fiber suspension mixture is discharged from mixer outlet. The mixer may have a premixing zone in which the gas and suspension are fluidized to the floc level and the gas is evenly distributed throughout the suspension, then a homogenization zone in which the fiber suspension is fluidized to fiber or microfloc level and the gas is brought into contact with each fiber or microfloc, and then a maintenance zone in which the fluidization level is maintained high enough to prevent the generation of gas bubbles and the separation of gas from the suspension.

Method and apparatus for mixing gaseous chemical to fiber suspension

An apparatus for the discharge of a mass tower containing medium to high consistency pulp and operable without the need for further dilution includes a vessel for storing the pulp; a suction duct extending from a zone of moving pulp to a region outside of the tower; and a pump attached to the end of the suction duct for discharging the pulp.

Growing community of inventors

Kotka, Finland

Reijo Vesala