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Procedure and system for control of refiner to improve energy efficiency and pulp quality

A refiner and slurry technology, which is applied in the fields of beating/refining control devices, pulp beating/refining methods, textiles and papermaking, etc., can solve the problems of not providing reliable control of pulp quality parameters, different pulp quality, etc.

Inactive Publication Date: 2011-10-26
A 卡尔斯托姆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, it is clear that the inventors controlling the refining process based on the measurement of specific energy represented by the motor load did not provide reliable control of the slurry quality parameters, Because different slurry qualities may be produced at the same specific energy or motor load

Method used

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  • Procedure and system for control of refiner to improve energy efficiency and pulp quality
  • Procedure and system for control of refiner to improve energy efficiency and pulp quality
  • Procedure and system for control of refiner to improve energy efficiency and pulp quality

Examples

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Embodiment Construction

[0077] figure 1 A schematic diagram of a method of controlling a TMP slurry refiner is shown. The illustration shows a process with a single refiner 33 and a first control unit 32 . 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, the control optimizer, is arranged to manipulate external process variables as input to the process 33, such as the hydraulic pressure P that presses the refiner plates together hydr , indicated as F p wood chips 5 flow flow and indicated as F D of dilution water 2'. From process 33 a refined slurry is produced. An external variable 37 representing the slurry consistency 37 from the process and the quality Q from the sampling unit 35 is input to a second control unit, a state estimator 39 . An internal value 36 is fed to the state estimator 39, which represents the use of e.g. Figure 6 The temperature curve or pressure curve obtained from t...

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PUM

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Abstract

A method is described for controlling a process section for thermo-mechanical pulp (TMP) refining. The process section has 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 comprises measuring, alternatively estimating, one or more process variables representing external states outside of the refiner Formula (I) for said process section and measuring, alternatively estimating, one or more values representing one or more internal states states Formula (II) inside said at least one first refiner, and calculating a change for said at least one manipulated variable (u 1 ) for said at least one refiner using said measurement of an internal state Formula (II) of said at least one refiner and a measurement of said one or more process external states Formula (I); 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 thermomechanical slurry (TMP) refining process section. The invention is applicable to 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 are used in the pulp and paper industry and related It plays a key role in the industry's high-volume slurry production. Two types of refiners are important to mention here: low consistency (LC) refiners, where the slurry is refined to a consistency (dry content) of about four percent; and high consistency (HC) refiners. Grind, where the consistency is usually about forty percent. LC refining is performed in a two-phase system (flake / slurry and water), while HC refining has three phases: flake / slurry, water and steam. Refiners are also used in other industrial applications such as the manufacture of wood f...

Claims

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Application Information

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IPC IPC(8): D21D1/00
CPCD21D1/002D21D1/30
Inventor A·伊萨克森A·卡尔斯托姆
Owner A 卡尔斯托姆
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