Andritz Group

Glens Falls, NY, United States

Andritz Group

Glens Falls, NY, United States
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Patent
Andritz Group | Date: 2016-12-28

The invention relates to a film-stretching machine comprising two tracks, each one having a first rail (1) whereon clamps (3) move, said clamps closing at a set point of the pitch thereof, and a second rail (2) whereon carriages (5) move, said carriages being articulated, in a chain driven by a driving toothed wheel (6), in relation to two consecutive clamps, characterised by a wheel for indexing the set point of the pitch of the clamps.


The present invention relates to a method of producing steam at a digester plant of a chemical pulp mill. Black liquor is discharged from the digester (17) at a first temperature and pressure. The black liquor is treated in a flash tank (34) for generating flashed black liquor and flash steam at a second temperature and a second pressure, which are lower than the first temperature and pressure. The flashed black liquor (35) is taken for further treatment to the evaporation plant. The flash steam (38) is led to an indirect heat exchange contact with clean liquid in the reboiler (39) for boiling the liquid and for generating steam. The steam is led from the reboiler (39) into a fan or compressor (41) for increasing the steam pressure to a third pressure, which is higher than the second pressure and for adjusting the pressure of the steam in the flash tank. Steam at a third pressure is used for pretreating comminuted cellulosic fiber material, such as chips, prior to cooking.


A refining system and process using a specially designed stator refiner plate. The specially designed stator refiner plate includes a major refining surface having a series of bars and grooves, the bars include a leading surface having an irregular surface. The irregular surface hosts a series of protrusions extending along the bar. The bar further comprises a trailing surface that is relatively smooth compared to the leading surface. The trailing surface lacks an irregular surface.


A cast metal plate segment for a refiner of lignocellulosic material or a disperser of comminuted paper or packaging products, the plate segment including a front side with a front surface configured to refine the lignocellulosic material or disperge the comminuted paper or packaging products, and a back side, opposite to the front side, including a corner or edge, wherein the corner or edge comprises a casted surface between machined planar surfaces adjacent the corner or edge.


Patent
Andritz Group | Date: 2017-05-31

A Francis turbine runner including a shortened band length and a shortened blade length combined with a reversed runner blade leading edge having a junction of the leading edge with the band forerunning a junction of the leading edge with the crown in the rotational direction, and a bandless runner including a shortened periphery length and a shortened blade length combined with a reversed runner blade leading edge having a corner of the leading edge at the outer periphery of the runner that is in advance of where the leading edge joins the crown in the rotational direction. Additional feature includes an inverted trailing edge curvature design on the runner blade that further shortens the blade length.


The subject of the invention is a new method of utilizing lignin-containing material separated from spent kraft pulping liquor (black liquor) by (a) acidifying the liquor, or fraction thereof, to a pH not less than 7 thereby precipitating solid particles, (b) separating precipitated solid particles from the accompanying liquid and (c) subjecting material thus separated to a washing process exhibiting the following essential features: (i) separated material is washed with an aqueous medium or aqueous media in one or more steps, (ii) in each washing step, the washing medium contains, in a dissolved form, significant amounts of one or more added sodium salts, and (iii) the combined concentration of the added sodium salts in the washing medium in each washing step exceeds 3 % by weight, preferably exceeds 5 % by weight and most preferably exceeds 10 % by weight. Despite the relatively large amount of sodium left in the washed lignin-containing material, the material is, after possible partial or complete drying, utilized as fuel in a lime kiln of a pulp mill.


The invention is concerned with sets for mechanical processing, in particular refining, of suspended fibrous material as material to be treated in a refiner. A set comprises a die plate (2) which is configured as a perforated plate with receiving openings (12) in a predefined arrangement, into which blade-shaped processing elements (3) which protrude on the process side and are flowed onto by the fibrous material are inserted. Said blade-shaped processing elements (3) in each case have a plurality of base regions (10) which are spaced apart in the longitudinal extent, pass through the die plate (2) and project beyond the die plate (2) on the side which is remote from the process. In one design variant, at least some of the base regions (10) of the processing elements (3) reach into associated receiving grooves of an additional base plate (8) on the side (14) which is remote from the process. In one alternative embodiment, transverse stiffening elements (4) are provided which are arranged substantially orthogonally in the longitudinal direction of the processing elements in such a way that the transverse stiffening elements (4) stabilize the base regions (10) of the processing elements on the side which is remote from the process.


The subject of the invention is a new method for handling spent wash solution produced in the washing of lignin that has been precipitated and then separated from spent alkaline pulping liquor. At least part of the spent wash solution is introduced into the chemical recovery cycle at a location in that part of the cycle which starts at, and includes, the smelt dissolving stage and ends at, and includes, the pulping stage. In preferred embodiments, input of other water and/or aqueous solution into the chemical recovery cycle after the recovery boiler is adjusted so that, as a consequence of the introduction of the spent wash solution, the amount of water in the white liquor going to the pulping line is not significantly increased. Among others, two preferred locations for the introduction of the spent wash solution are (1) the smelt dissolver and (2) the location where unwashed lime mud is diluted.


Patent
Andritz Group | Date: 2017-05-10

A perforated replaceable insert for a sand separator vessel in a digester feed system where the perforations have at least a width and a length. The perforations are aligned columns and rows, with the columns being positioned to be parallel to a line formed by the tangent of the conical axis.


The present disclosure describes a system for predicting explosions in a dissolving tank. The system includes acoustic emission sensors placed in or around the dissolving tank. By filtering the recorded frequencies to the range which is most sensitive for desired explosions fingerprints, it is possible to predict a smelt influx before the smelt influx occurs as well as program response actions to prevent compromising explosions.

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