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Process and system for refining fibrous material with improved energy efficiency and pulp quality

A technology for fibrous materials, pulp, applied in the field of processes and systems for grinding fibrous materials with improved energy efficiency and pulp quality, capable of solving the problems of reliable control, unprovided pulp quality parameters, etc.

Active Publication Date: 2016-02-24
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] It is however clear to the inventors that controlling the refining process based on measurements of specific energy as represented by motor load does not provide reliable control of pulp quality parameters, since different pulp qualities may be produced at the same specific energy or motor load

Method used

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  • Process and system for refining fibrous material with improved energy efficiency and pulp quality
  • Process and system for refining fibrous material with improved energy efficiency and pulp quality
  • Process and system for refining fibrous material with improved energy efficiency and pulp quality

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Embodiment Construction

[0094] figure 1 A schematic diagram of a method for controlling a refiner for refining fibrous material such as eg a TMP pulp refiner is shown. The figure shows a process with a single refiner 33 and a first control unit 32 . shows the control motor 10 ( Figure 4 , 8 ) variable speed drive controller 11, the motor is used to drive the primary refiner 33. One or more setpoints 30 are input to a first control unit or control optimizer 32 or similar device having the same function. The first control unit (control optimizer) is arranged to manipulate external process variables such as the hydraulic pressure P that presses the refiner plates together hydr , expressed as F P The sawdust flow rate (wood chips expressed as Figure 4 5) and denoted as F D The flow rate of dilution water 2 (water expressed as Figure 8 , 9 2)) as input to process 33. Refined pulp is produced from process 33 . External variables 37 and 38 representing the pulp consistency C from the process an...

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Abstract

A method is described for controlling a process section for refining fibrous material such as wood pulp, cellulose pulp and the like. The process section has a refiner driven by a motor of which the speed is variable. Using a multivariable control method the process may be optimised for energy by varying the rotation speed of the refiner. The process section may also have at least one first refiner having a plurality of sensors arranged in a predetermined position on a refiner plate of the at least one first refiner. The method may also comprise measuring, alternatively estimating, one or more process variables representing external states outside of the refiner (?1,Q1) for said process section and measuring, alternatively estimating, one or more values representing one or more internal states (?1) inside said at least one first refiner, and by calculating a change for said at least one manipulated variable (u1) for said at least one refiner using said measurement of an internal state (?1) of said at least one refiner and a measurement of said one or more process external states (n1,Q1) for said process section by means of a mathematical process model.

Description

technical field [0001] The present invention relates to an improved method for controlling one or more refiners in a process section for refining fibrous material. The invention can be applied in all technical fields where refiners are used, such as the pulp and paper industry and related industries. Background technique [0002] Refiners of one type or another for the pulp and paper industry and related industries in the production of high yield pulp and for fiber pretreatment in papermaking by grinding (e.g. thermomechanical pulp from lignin-cellulosic material such as wood chips) (TMP) or chemithermomechanical pulp (CTMP)) play a central role. Two important classes of refiners are mentioned here: low consistency (LC) refiners, where the pulp is refined at a consistency (dry content) of about 4%, and high consistency (HC) refiners, where the consistency is usually about 40% . LC refining is done in a two-state system of wood chips / pulp and water, while HC refining has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21D1/00D21D1/20D21G9/00
CPCD21D1/002D21D1/20D21G9/0018
Inventor A·卡尔斯托姆A·伊萨克森L·勒唐S·萨伊内维尔塔
Owner ABB (SCHWEIZ) AG
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