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Method for calculating pulping strength of disc mill by using calculus method

A calculus and disc calculation technology, which is applied in the field of disc refiner refining strength calculation, can solve problems such as inability to accurately guide the selection of grinding discs and tooth profile design

Pending Publication Date: 2021-10-22
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calculating the refining strength of a disc refiner by using the calculus method, which solves the problem that the current theoretical calculation method for the refining strength cannot accurately guide the selection of the grinding disc and the design of the tooth shape

Method used

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  • Method for calculating pulping strength of disc mill by using calculus method
  • Method for calculating pulping strength of disc mill by using calculus method
  • Method for calculating pulping strength of disc mill by using calculus method

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Experimental program
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Effect test

Embodiment

[0055] MD3000 single-disk laboratory refiner is used for refining. Under the conditions of the refiner speed of 1460rpm and the disc gap of 0.1mm, 20% softwood natural color wood pulp and 80% broadleaf bleached wood pulp are mixed as raw materials. The degree of beating is 13° SR, and the average fiber length is 1.75 mm. The refining test is carried out by four groups of grinding discs with different tooth shapes of the movable and fixed discs respectively, to illustrate the implementation steps of the present invention. The parameters of the grinding disc and tooth shape used in the experiment are shown in Table 1 and Table 2.

[0056] Table 1 Grinding disc and tooth shape parameters used in the test

[0057]

[0058] Table 2 Common parameters of the four groups of grinding discs

[0059]

[0060] Step 1. The inner and outer diameters of the moving plate and the fixed plate used in the four experiments are the same. According to the calculation formula of the total are...

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Abstract

The invention belongs to the technical field of grinding strength calculation of disc mills, and particularly relates to a method for calculating the pulping strength of a disc mill by using a calculus method. The method comprises the following steps: respectively calculating the total area of a movable disc surface and the total area of a fixed disc surface according to the total area of a grinding disc surface; respectively calculating the tooth surface area of the movable disc and the tooth surface area of the fixed disc by utilizing a calculation formula of the tooth surface area of the grinding disc constructed by a calculus method; solving the grinding tooth contact area according to the movable disc tooth surface area, the fixed disc tooth surface area and the movable disc surface total area; and calculating the grinding strength of the disc mill by utilizing the grinding net power, the rotating speed of the grinding disc and the contact area of the grinding teeth. By the adoption of the method, analysis of the pulping mechanism, clarification of pulping quality and comparison of pulping energy consumption are facilitated, included grinding disc tooth shape parameters can provide guidance for grinding disc type selection and grinding tooth design, and related control parameters facilitate control over the pulping process.

Description

technical field [0001] The invention belongs to the technical field of calculating the refining intensity of a disc refiner, in particular to a method for calculating the refining intensity of a disc refiner by using a calculus method. Background technique [0002] As the core equipment in the pulping process, the disc refiner plays a vital role in the pulp quality, which can be measured and predicted by the refining intensity. [0003] At present, there are many theories of refining strength, such as specific edge load SEL, improved specific edge load MEL, specific surface load SSL, modified specific surface load MSSL and C factor theory, among which the most widely used refining strength theory is SEL, but The calculation formula only considers the tooth profile parameter of grinding tooth inclination angle as a factor affecting the refining process, and the improved MEL, SSL, MSSL refining strength theory takes into account factors such as grinding tooth width, staggered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F17/13
CPCG06F30/17G06F17/13
Inventor 郭西雅董继先刘欢段传武祈凯杨瑞帆
Owner SHAANXI UNIV OF SCI & TECH