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Method and device for process temperature control by means of a heat pump in a material preparation cycle

A preparation process, temperature control technology, applied in heat recovery systems, energy-saving heating/cooling, and removal of fat/resin/asphalt/wax from pulp, etc., can solve problems such as decreased separation rate of sticky dirt, and achieve a small tendency to stick , energy saving, good separation effect

Inactive Publication Date: 2018-05-22
ANDRITZ AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At higher process temperatures, for example, in the range above 55°C, this sticky contamination always becomes softer and becomes plastically deformable already under small loads, thus They can easily pass through the gap of the sorter during the sorting process, so the separation rate of viscous dirt decreases significantly as the temperature rises

Method used

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  • Method and device for process temperature control by means of a heat pump in a material preparation cycle

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Embodiment Construction

[0017] In this case, fibrous material 15 , such as waste paper, is introduced into the material separator 6 and the fibrous material 15 is disintegrated therein. The dissociated fibrous material flow 13 is then introduced by means of a pump 12 into a sorting system 5 in order to separate contaminants, with particular attention to sticky contaminants. The sorting system essentially consists of several, but at least one, so-called pressure classifier stages, which are provided with rotors and screen baskets. The aim is to achieve the greatest possible sorting accuracy between the pollutants (in particular viscous soils) and the fibrous material. Here, as much fiber as possible should pass through the screen basket as so-called good material. The cleaned good material stream 14 of the sorting system 5 can then be passed on to further process steps.

[0018] Cooled dilution water (filtrate) 1' is added to the fibrous material suspension prior to the sorting process via dilution ...

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Abstract

The invention relates to a method and a device for process temperature control by means of a heat pump in a material preparation cycle: a method for process temperature control in a fibrous material preparation process, in particular in waste paper preparation, for the formation of a fibrous material suspension The fiber material (15) used is dissociated in the material dissociator (6) and introduced into the subsequent sorting system (5), after said material dissociator (6) and after said sorting system ( 5) Dilution water ( 1 ′) is previously introduced into the fibrous material suspension, heat is extracted from the dilution water ( 1 ) by means of a heat pump ( 7 ) before being added to the fibrous material suspension. According to the invention heat is extracted by means of a heat pump (7) from the dilution water (1) introduced after dissociation of the material. And an apparatus capable of carrying out the method according to the invention. In the method and device according to the invention, the process temperature is lower than in conventional devices, so that sticky contaminants (sticky dirt) can be effectively separated.

Description

technical field [0001] The subject of the present invention is to construct a method for process temperature control in the preparation of fibrous material, in particular waste paper, wherein the fibrous material is dissociated in a material dissociation device (pulp machine) and at this time The resulting suspension of fibrous material is introduced into a subsequent sorting process. In this case, dilution water is introduced into the fibrous material suspension after the material dissociator and before the sorting process. [0002] The subject of the invention is also the design of a device for carrying out the method according to the invention. Background technique [0003] Today in the paper industry it is no longer possible to ignore the extensive use of fibrous materials, in particular recycled fibrous materials. Depending on the application or end product, but also due to the deterioration of the quality of the supplied waste paper, this material preparation process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/08
CPCD21C5/02Y02B30/52Y02W30/64
Inventor 亚历山德·克沙伊德尔弗里德里希·琥珀格尔诺特·魏尔哈特
Owner ANDRITZ AG
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