高差压控制阀的侵蚀特征和闪蒸流：使用侵蚀耦合动态网格的数值研究

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-01-01 DOI:10.47176/jafm.17.3.2226

G. F. Ou, C. G. Wang, H. Z. Jin

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引用次数: 0

摘要

为解决煤化工行业黑水闪蒸系统控制阀的冲蚀问题，本研究对此类控制阀的动态冲蚀特性进行了研究。研究采用计算流体动力学方法，比较了静态网格和冲蚀耦合动态网格的结果，并通过分析冲蚀率、颗粒冲击速度、轨迹和角度来研究阀门的冲蚀情况。此外，还以流动阻力系数为重点，研究了侵蚀引起的变形与阀门中闪蒸相的分散之间的关系。结果表明，在 9 × 106 秒的时间内，颗粒的撞击速度和随后的碰撞都会降低，撞击角度也会随着阀芯的累积变形而减小。值得注意的是，阀芯主要受低撞击角产生的切削影响，导致阀门的整体侵蚀率大幅下降，降幅达 56.4%。面向水流的区域有很大的侵蚀风险，随着开口的减小，侵蚀区逐渐扩展到阀芯和阀头的环形区域，导致侵蚀变形增加。此外，随着流动阻力系数的减小，阀门内的蒸汽体积分数也会减小。这项研究为预测黑水闪蒸系统中高差压控制阀的故障和开发在线监测解决方案提供了理论依据。

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Erosion Characteristics and Flashing Flow of High-differential-pressure Control Valves: A Numerical Study using an Erosion-Coupled Dynamic Mesh

To address the issue of erosion in the control valves of blackwater flash systems in the coal chemical industry, this study investigates the dynamic erosion characteristics of one such control valve. Computational fluid dynamics is employed to compare the results obtained with a static mesh and an erosion-coupled dynamic mesh, and the valve erosion is investigated by analyzing the erosion rate, the particle impact velocity, trajectories and angle. Moreover, the relationship between the deformation caused by erosion and the dispersion of the flash vapor phase in the valve is studied, focusing on the flow resistance coefficient. The results indicate that over a period of 9 × 106 s, the impact velocity and subsequent collisions of particles reduce, and the impact angle decreases with the accumulated deformation of the valve core. Notably, the valve core is influenced primarily by the cutting that results from low impact angles, leading to a substantial decrease in the overall erosion rate of the valve, amounting to a reduction of 56.4%. The region facing the flow is at significant risk of erosion, and as the opening decreases, the erosion zone extends gradually to the annular region of the valve core and valve head, leading to increased erosion deformation. Furthermore, as the flow resistance coefficient decreases, so does the vapor volume fraction inside the valve. This study provides a theoretical basis for predicting faults and developing online monitoring solutions for high-differential-pressure control valves in blackwater flashing systems.

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .