Paper pulp quality control method and system of high-concentration defibrination system

A high-consistency refining and pulping technology, applied in pulp beating/refining methods, beating/refining control devices, papermaking, etc., can solve complex dynamic characteristics, difficulties in modeling and control of high-consistency refining systems, and laboratory analysis Long cycle and other issues, to achieve the effect of reducing energy consumption

Active Publication Date: 2017-01-04
NORTHEASTERN UNIV
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Problems solved by technology

However, the ultimate control goal of the high-consistency refining system is to obtain the desired pulp quality, but the current control of the high-consistency refining system is to control the operating state variables of the system. , but the cycle of assay analysis is longer, usually every few hours
It is obviously difficult to me

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  • Paper pulp quality control method and system of high-concentration defibrination system
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  • Paper pulp quality control method and system of high-concentration defibrination system

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Embodiment Construction

[0071] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0072] The process flow of a typical high-consistency refining system is as follows: figure 1 As shown, the wood chips 1 are first sent to the pre-steaming bin 2 for pretreatment, and the pretreated wood chips 1 are sent to the grinding area under the action of the feeding screw conveyor 3, and at the same time, a certain amount of dilution water 4 is injected into the grinding area, and the motor 10 drives The hydraulic cylinder 9 works, thereby driving the mill fixed plate 5 and the mill motor plate 6 to cooperate and grind the slurry to discharge the steam 8 under the action of the gas-slurry separator 7, and finally obtain the pulp 11 that meets the production demand.

[0073] The input variable is the feeding screw speed u 1 (rpm), disc clearance u 2 (mm), dilution water flow u 3 (kg / min), the state variable is output v ...

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Abstract

The invention provides a paper pulp quality control method and system of a high-concentration defibrination system. The method comprises the steps that the feeding spiral rotating speed, abrasive wheel clearance, dilution water flow, yield, mill load and paper pulp concentration of the high-concentration defibrination system are collected; a high-concentration defibrination system paper pulp quality control model is used for operation variable prediction; predicated operation variables are sent to an executing mechanism of the high-concentration defibrination system. The system comprises a data collecting unit, an operation variable prediction unit and an output paper pulp quality control unit. Based on high-concentration disc mill input and output relevant data measured by a sensor on a chemical mechanical pulping production line, an AIC criterion is combined to determine the order of a submodel, a submodel parameter is obtained through a forgetting factor least square algorithm, a mechanism model of the paper pulp quality freeness index is combined to build a Wiener model structure of the a high-concentration defibrination system, the quadratic performance index is optimized through a sequential quadratic programming algorithm, and the pulping output paper pulp quality index-freeness is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking process control, in particular to a pulp quality control method and system for a high-consistency refining system. Background technique [0002] Chemi-Thermo-Mechanical Pulping (CTMP) is developed on the basis of traditional Thermo-Mechanical Pulping (Thermo-Mechanical Pulping, TMP), and a period of chemical impregnation treatment is usually added before the TMP production line. That is, after the wood chips are preheated, they are impregnated with chemicals, and then the wood chips are ground into slurry according to the TMP production method. Because of its advantages such as strong raw material adaptability, high utilization rate of wood chips, high pulp yield, wide product application and simple process equipment, it is widely used in the pulp and paper industry. As the main process in the CTMP production process, the high-consistency refining system is a typical process with ...

Claims

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Application Information

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IPC IPC(8): D21D1/00D21D1/30D21C7/00
CPCD21C7/00D21D1/002D21D1/303
Inventor 李明杰周平
Owner NORTHEASTERN UNIV
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