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Effect of Refiner Plate Bar Angle and Pulp Properties on the Low Consistency Refining Efficiency in Terms of Power Consumption

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Paper And Biomaterials 2023年第4期8卷 27-36页

作者： Huan Liu jixian dong Yongping Pu Xiya Guo Lijie Qiao Yan Yan College of Materials Science and Engineering Shaanxi University of Science&TechnologyXi'anShaanxi Province710021China College of Mechanical and Electrical Engineering Shaanxi University of Science&TechnologyXi'anShaanxi Province710021China College of Arts and Design Shaanxi University of Science&TechnologyXi'anShaanxi Province710021China College of Mechanical and Electrical Engineering Xi'an Polytechnic UniversityXi'anShaanxi Province710048China

Power consumption is the energy source of the impact on fibers or pulp during low-consistency(LC)pulp refining,and the strength of refining affects refining quality and *** pulp properties,operating parameters,and bar parameters of the refiner plates are important parameters affecting refining efficiency,which can be defined as the ratio of net to total refining *** this study,LC refining trials for pulps with different consistencies and fiber lengths were conducted using five isometric straightbar plates with different bar angles to explore the influences of the plate bar angle and pulp properties on the no-load power,impact capacity on fibers and refining *** was found that the no-load power of the LC refining process decreased with an increase in the plate bar angle while increased when pulp with higher consistency was refined under the same refining ***,the effect of pulp consistency on the no-load power can be neglected when refining is conducted using plates with larger bar ***,a critical bar angle for straight-bar plates in LC refining may exist,which has the strongest impact on the pulp and highest refining efficiency under the same refining *** addition,the impact capacity of the plate on the pulp and refining efficiency in LC refining can be enhanced by appropriately increasing the pulp consistency and average fiber length when the bar angle of the refiner plate with a sector angle of 40°is less than 30°.Therefore,the efficiency and power consumption of the LC refining process can be adjusted by optimizing the pulp consistency and bar parameters of the refining plates.

关键词： low-consistency refining refiner plate bar angle pulp properties no-load power refining efficiency

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Design Method of Curved-bar Refining Plates for Disc Refiner

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Paper And Biomaterials 2019年第1期4卷 40-47页

作者： Huan Liu jixian dong XiYa Guo RuiFan Yang Hui Jing XiaoJun Jiang College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’anShaanxi Province710021China Shaanxi Research Institute of Agricultural Products Processing Technology Xi’anShaanxi Province710021China College of Art and Design Shaanxi University of Science and TechnologyXi’anShaanxi Province710021China Nantong Huayan Casting Co. Ltd.NantongJiangsu Province226403China

Straight-and curved-bar refining plates are two important types of plates commonly used in disc refiners in the papermaking ***,the curved-bar refining plate has a relatively uniform bar interaction angle,which indicates uniform refining *** bar angle of the curved bar was proposed and two typical curved-bar plates,the three-stage radial curved-bar plate and isometric curved-bar plate,were designed in this *** arc equations of the curved-bar center line and curved-bar edges were established and finally,the specific edge load(SEL)of the curved-bar plate was *** determination of bar parameters was discussed,which provides a theoretical basis for the design of curved-bar plates.

关键词： disc refiner refining plates curved bar design method

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Study on the Influence of Structural Parameters of Multi-channel Cylinder Dryer on Heat Transfer Performance

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Journal of Energy and Power Engineering 2017年第7期11卷 454-464页

作者： Yan Yan dong jixian Shaanxi University of Science & Technology Xi 'an 710021 China

An approach to design multi-channel cylinder dryer was proposed. The heat transfer performance and flow characteristic under various structural parameters were analyzed. First, an experiment was designed and set up to measure the condensing heat transfer coefficient and the pressure drop in order to ,~erify the applicability of the Cavallini＇s correlation. Then, the relationship among the count of channels, aspect ratio, spacing ratio, width, height and hydraulic diameter of a channel was given. Finally, the correlation of condensing heat transfer and the homogeneous model was introduced in order to observe the heat transfer performance and flow characteristic of the multi-channel cylinder dryer affected by different structures. The study reveals that the structural parameters including count of channels, aspect ratio, spacing ratio of a channel dramatically influence the condensation heat transfer coefficient and frictional resistance of the steam. Based on the selected paper machine, it is suggested that the overall performance of the multi-channel cylinder dryer is best if the count of channels is 150-200, the aspect ratio is 1 ： 3 and the spacing ratio is 1 ： 1-1 ： 3.

关键词： Multi-channel cylinder dryer condensation heat transfer distributed parameter model numerical simulation.

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高宽比对矩形通道内蒸汽冷凝传热特性及流型影响的研究

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化工学报 2018年第9期69卷 3851-3858页

作者：严彦董继先西安工程大学机电学院陕西西安710048 陕西科技大学机电学院陕西西安710021

通过可视化流型观测及实验测量,研究了单边换热矩形小通道的高宽比对两相流型、平均冷凝传热系数及两相流动阻力的影响,采用高速摄像机拍摄了环状流、环波状流、波状流、弹状流、塞状流及泡状流6种典型流型。研究表明,高宽比为1:2及1:3... 详细信息

通过可视化流型观测及实验测量,研究了单边换热矩形小通道的高宽比对两相流型、平均冷凝传热系数及两相流动阻力的影响,采用高速摄像机拍摄了环状流、环波状流、波状流、弹状流、塞状流及泡状流6种典型流型。研究表明,高宽比为1:2及1:3的通道内出现流型种类较为全面,而在高宽比为1:5通道内基本无弹状流、塞状流及泡状流。1:5通道内环状流所占区域较1:2及1:3通道大,随入口蒸汽质量流速的增加,差值逐步减小。随着通道高宽比的减小,平均冷凝传热系数逐渐增大;不同高宽比通道中平均冷凝传热系数间的差值随入口蒸汽质量流速的增加而减小;蒸汽质量流速足够高时,高宽比对传热系数基本无影响。通道内两相流压降随通道高宽比的减小而增大;随着入口蒸汽质量流速的增加,不同比例通道内的两相流动压降差距逐渐增大。

关键词：矩形通道高宽比流型凝结传热

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Simulation of the Flow Conditions in Different Types of Bar Structures of Disc Refiner

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Paper And Biomaterials 2018年第1期3卷 47-52页

作者： jixian dong LuBing Han Huan Liu College of Mechanical and Electrical Engineering of Shaanxi University of Science&Technology Xi’anShaanxi Province710021China Shaanxi Research Institute of Agricultural Products Processing Technology Xi’anShaanxi Province710021China

Disc refiner is a critical equipment in the pulping and papermaking industry, pulp is refined in the refining zone, and different bar structures of refining disc constitute the different refining zones. With the use of the 3D modeling software SOLIDWORKS, five different refining discs that are commonly used in low consistency pulping, were built. The five refining discs were simulated and analyzed using the Computational Fluid Dynamics(CFD)software. The distribution of pulp velocity and surface shear stress, which is displayed between the bar and groove structures, can indirectly show the stress conditions on the refining discs. This paper provides a theoretical basis for research on the bar and groove failure of the refining discs.

关键词： pulping disc refiner bar structure CFD

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Positioning-control Based on Trapezoidal Velocity Curve for High-precision Basis Weight Control Valve

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Paper And Biomaterials 2017年第2期2卷 42-50页

作者： Bo Wang Wei Tang jixian dong Feng Wang College of Bioresources Chemical & Materials Engineering of Shaanxi University of Science &Technology Xi'an Shaanxi Province 710021 China Shaanxi Research Institute of Agricultural Products Processing Technology Xi'an ShaanxiProvince 710021 China Zhejiang Linuo Flow Control Technology Co. Ltd. Rui'an Zhejiang Province 325200 China

Traditionally, basis weight control valve is driven by a constant frequency pulse signal. Therefore, it is difficult for the valve to match the control precision of basis weight. Dynamic simulation research using Matlab/Simulink indicates that there is much more overshoot and fluctuating during the valve-positioning process. In order to improve the valve-positioning precision, the control method of trapezoidal velocity curve was studied. The simulation result showed that the positioning steady-state error was less than 0.0056%, whereas the peak error was less than 0.016% by using trapezoidal velocity curve at 10 positioning steps. A valve-positioning precision experimental device for the stepper motor of basis weight control valve was developed. The experiment results showed that the error ratio of 1/10000 positioning steps was 4% by using trapezoidal velocity curve. Furthermore, the error ratio of 10/10000 positioning steps was 0.5%. It proved that the valve-positioning precision of trapezoidal velocity curve was much higher than that of the constant frequency pulse signal control strategy. The new control method of trapezoidal velocity curve can satisfy the precision requirement of 10000 steps.

关键词： high-precision basis weight control valve precision positioning control trapezoidal velocity curve Matlab/Simulink simulation

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多通道烘缸水平矩形管内冷凝换热特性及流型

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西安交通大学学报 2017年第4期51卷 116-121页

作者：严彦董继先高秀峰陕西科技大学机电工程学院西安710021 西安交通大学化学工程与技术学院西安710048

为研究多通道烘缸内蒸汽的冷凝换热特性,提高烘缸干燥效率,降低造纸工业能耗,采用可视化方法对多通道烘缸中的单边换热水平矩形管内蒸汽冷凝现象进行了观测实验。实验观察到了环状流、波状流、弹状流以及塞状流4种流型。实验结果表明:... 详细信息

为研究多通道烘缸内蒸汽的冷凝换热特性,提高烘缸干燥效率,降低造纸工业能耗,采用可视化方法对多通道烘缸中的单边换热水平矩形管内蒸汽冷凝现象进行了观测实验。实验观察到了环状流、波状流、弹状流以及塞状流4种流型。实验结果表明:当质量流率较小时,小干度下流型主要为塞状流和弹状流,随着干度的增大,流型转变为波状流;当质量流率较大时,即使小干度下流型仍主要为波状流和环状流,冷凝过程无塞状流和弹状流出现。经比较,Tandon流型图可较好地预测实验观察到的流型。此外,当质量流率较小(G<35kg·m-2·s-1)时,换热系数受质量流率和干度影响较小;随着质量流率增大,换热系数受质量流率和干度的影响变大,且随着质量流率和干度的增大而增大。最后,将实验值与传统经验关联式计算值进行了对比,发现Cavallini的关联式能较好地预测该实验结果。

关键词：可视化流型冷凝换热多通道烘缸

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基于分布参数模型的多通道烘缸传热模拟

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中国科技论文 2017年第11期12卷 1294-1299页

作者：严彦董继先陕西科技大学机电工程学院西安710021

建立了多通道烘缸通道内蒸汽冷凝换热的分布参数模型,分析了不同结构参数对多通道烘缸传热和流动特性的影响。通过对某一纸机的性能进行模拟分析,考察了通道数量及高宽比等参数对蒸汽冷凝换热和流动特性的影响。结果表明:在1个给定的高... 详细信息

建立了多通道烘缸通道内蒸汽冷凝换热的分布参数模型,分析了不同结构参数对多通道烘缸传热和流动特性的影响。通过对某一纸机的性能进行模拟分析,考察了通道数量及高宽比等参数对蒸汽冷凝换热和流动特性的影响。结果表明:在1个给定的高宽比下,通道数量有一最优值,在该通道数量下,蒸汽恰好完全冷凝成水,且通道中释放的热量与纸张蒸发所需的热量一致;同时,高宽比太小会导致通道设计的精确性增大,而高宽比太大则会使得沿程阻力增加,因此,选择高宽比在1/3~1/6较为合理,所建模型可作为多通道烘缸通道设计的理论依据。

关键词：多通道烘缸冷凝换热分布参数模型数值模拟

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高压注射连续式皮革湿加工设备的研究与设计

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中国皮革 2000年第15期29卷 10-12页

作者：董继先袁恩会西北轻工业学院机械系咸阳712081

本文将高压注射所产生的高速渗透效应首次应用到皮革工业的湿加工过程中 ,并依据此原理提出了皮革湿加工过程实现连续生产的创新设计。

关键词：皮革湿加工高压注射连续式高速渗透加工设备

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旋转多通道烘缸传热特性的数值模拟分析

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中国造纸 2020年第2期39卷 61-64页

作者：严彦董继先宋智伟西安工程大学机电学院陕西西安710048 陕西科技大学机电工程学院陕西西安710021

多通道烘缸可有效排除烘缸通道内的冷凝水,从而降低能耗,提高干燥效率。但是多通道烘缸旋转速度较高,很难通过实验方式对烘缸的冷凝传热过程进行测量。因此,本研究应用Fluent软件中的VOF两相流模型对多通道烘缸中蒸汽冷凝传热特性进行... 详细信息

多通道烘缸可有效排除烘缸通道内的冷凝水,从而降低能耗,提高干燥效率。但是多通道烘缸旋转速度较高,很难通过实验方式对烘缸的冷凝传热过程进行测量。因此,本研究应用Fluent软件中的VOF两相流模型对多通道烘缸中蒸汽冷凝传热特性进行了数值模拟。以多通道烘缸的旋转速度作为变量,得出了冷凝水含量、传热系数及流动压降的变化规律。结果表明,随烘缸转速升高,通道内冷凝水量增多,传热系数及压降也增大,但是增幅趋缓。

关键词：多通道烘缸冷凝传热旋转速度数值模拟

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