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A method and a system for controlling a refiner, for refining a product containing cellulose, such as pulp, and an information of a quality index of the product

A technology for pulping machines and cellulose, applied in general control systems, control/regulation systems, pulp beating/refining methods, etc., to achieve precise initial control, minimize the need for trial operation and testing, and improve process control

Active Publication Date: 2016-03-30
芬宝公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the online controlled pulping process, few standards are available

Method used

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  • A method and a system for controlling a refiner, for refining a product containing cellulose, such as pulp, and an information of a quality index of the product
  • A method and a system for controlling a refiner, for refining a product containing cellulose, such as pulp, and an information of a quality index of the product
  • A method and a system for controlling a refiner, for refining a product containing cellulose, such as pulp, and an information of a quality index of the product

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] image 3 Shown is a control system for a mill according to the prior art, where pulp is produced from a pulping machine with constant energy consumption. The process control parameters include the preparation consistency and flow characteristics of the slurry and the specific tool type at the station. These parameters however do not give a statistically reliable indication or prediction of seminal plasma CSF values. The main components of the system shown include the pulp input, the refiner 1, the specific energy consumption of this refiner controlled by the process control system 2 via signal 6, the CSF measuring unit 3,4 and the pulp slurry controlled via valve 5 exit.

[0057] The CSF value is read at the unit 3 and the process control system 2 adjusts according to this feedback so that the refining process in the refiner 1 is more or less efficient.

example 2

[0059] Figure 4 Shown is a pulper using the control system of the present invention. Such as image 3 , there are feedbacks from the CSF measurement units 3 and 4, and the above-mentioned conventional process control parameters, and the feedback is the input signal 9 of the grinding paper module unit 8 . Again, here's the quality index BotniaFOX TM is used as an input value as a base value for calculating the pulping description of the pulp fed into the control system 7 . This creates a feed-forward loop 8-7->1, improving control quality and process speed. The delay of the control system using the predefined quality index information of the pulp is smaller than that of the CSF feedback control loop 4->3->8->7->1. In practice, this means that if a process parameter changes, including quality index values, it is possible to correct the operation of the refiner in 6 even before the CSF value in 4 changes to an undesired value .

[0060] The method of the present invention ...

example 3

[0065] Figure 5 Shown is another embodiment of the invention in which a stock quantity control loop is added at 11,12,13. This allows products, such as paper, to maintain a constant CSF value and tensile strength at the same time. Such as Figure 4 The CSF value is controlled. If the flow meter 13, which measures the slurry flow rate in valve 12, receives an indication that quality indicators and the following other process parameters have changed, then the amount of cellulose in 11 will be changed to ensure that the desired tensile strength is maintained or achieved or stiffness. It will be appreciated that the control loop is enabled by the predictability of the process provided by the pulp quality index and the inventive concept that this index can provide a statistically significant and stable indication of refining properties.

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PUM

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Abstract

The present invention relates to a method and a system for controlling a refiner, grinder or the like for refining a product containing cellulose, such as pulp. A quality index specific to the product is provided and related to at least one predefined property of a slurry containing the cellulose product, or a finished product made of it. Control signals in response to the quality index is generated to achieve a desired value of the predetermined property, and at least one operating parameter of the refiner is set accordingly. The predefined property is either the tensile strength of said finished product or the Canadian Standard Freeness (CSF) of the slurry.

Description

technical field [0001] The present invention relates to a method for controlling a refiner to produce a product comprising cellulose, such as pulp. Background technique [0002] In pulp production enterprises, the logistics system must identify and track the process of leaving the cellulosic product and ensure that the product is delivered to the right customer at the right time. To date, this has required visual inspection or scanning of barcodes to label pulp units, and such inspection has provided only one method of identifying product batches. RFID technology is being deployed in many applications that require long-range and rapid identification, such as in the supply chain of goods. [0003] The pulp unit also has unique requirements in terms of quality information. Typically, the pulp is pulped, refined, analyzed for properties and added with chemicals at the customer's paper mill, just like any other process step. According to traditional quality control methods, p...

Claims

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Application Information

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IPC IPC(8): D21D1/20D21D1/00G05B13/00G01N33/34
CPCD21D1/002D21G9/0018D21D1/00D21D1/20G01N33/343G01N33/346G05B13/00
Inventor 奥提·波卡埃斯科·佩库里
Owner 芬宝公司
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