Study on transient opening and closing performance of one-way ball valve in oil-gas multiphase reciprocating pump
ZHANG He1*, ZHANG Huajun2, ZHANG Shengchang3
1. Hangzhou Shengwei Technology Co. Ltd., Hangzhou, Zhejiang 310000, China; 2. Hangzhou Special Equipment Inspection and Research Institue, Hangzhou, Zhejiang 310051, China; 3. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310000, China
Abstract:The transient opening and closing processes and reciprocating motion characteristics of the one-way ball valve in the 3DP-60/3.0 type oil-gas multiphase reciprocating pump were simulated by using user-defined functions(UDF)and dynamic mesh model in Fluent to investigate the influence of different parameters on hysteresis in the processes under variable flow conditions. The opening height-time function of the valve was involved in a UDF and the inlet fluid velocity, static pressure and kinetic energy loss under two limit conditions of opening and closing moments were focused. The influences of inlet flow rate, opening height and gas content on the pressure field and gas-liquid two-phase volumetric fraction distribution in the valve were revealed. Experimental data were compared with simulated results to verify the reliability of numerical simulations. The results show that the pressure drop across the valve rises with increasing inlet flow rate whether under pure liquid or low gas content two-phase flow condition, particularly with a more uniform increment. The inlet pressure difference gradually decreases when the opening height increases to 6 mm from 2 mm, presenting a decreasing trend with the gas content being 80%, 60% and 40%, respectively. When the gas content is reduced to 0%(pure liquid condition)from 20%, the smaller the opening height is, the greater the inlet pressure varies, showing a gradual phase separation on the valve surface and a larger interfacial pressure difference. The decrease of pressure drop across the valve is very significant as the gas content varies from 0% to 90%, especially, the pressure drop decreases steadily with further increasing gas content.
[1]马希金, 王宏亮, 赵学. 轴流式油气混输泵压缩级流场CFD模拟分析[J]. 农业机械学报, 2006, 37(2): 41-44.
MA Xijin, WANG Hongliang, ZHAO Xue. CFD numerical simulation of flow in the stage of axial gas-oil multiphase pump[J]. Transactions of the CSAM, 2006, 37(2): 41-44.(in Chinese)
[2]张玉林. 转子式油气混输泵出口单向阀特性分析与研究[D]. 杭州:浙江工业大学, 2012.
[3]叶永彪, 朱永有, 王龙龙.往复泵泵阀失效分析[J]. 通用机械, 2006(2): 25-26.
YE Yongbiao, ZHU Yongyou, WANG Longlong. Failure analysis of reciprocating pump valve[J]. General machinery, 2006(2): 25-26.(in Chinese)
[4]李辉. 液压锥阀结构参数与工作性能的数值分析[D]. 成都:西南交通大学, 2009.
[5]YOO Y H, SUH K Y. Engineering analysis of mass flow rate for turbine system control and design[J]. Nuclear engineering & design, 2011, 241(10):4061-4078.
[6]VALDES J R, RODRIGUEZ J M, MONGE R, et al. Numerical simulation and experimental validation of the cavitation flow through a ball check valve [J]. Energy conversion and management, 2014, 78: 776-786.
[7]GHORAI S, NIGAM K D P. CFD modeling of flow profiles and interfacial phenomena in two-phase flow in pipes[J]. Chemical engineering and processing, 2006, 45(1):55-65.
[8]冯志丹. 含气率变化对轴流式油气混输泵轴扭应力的影响及改善[D]. 兰州:兰州理工大学, 2014.
[9]吴建军, 綦耀光, 刘新福,等. 基于Simulink的抽油泵泵阀运动规律仿真[J]. 石油机械, 2011, 39(1): 32-35.
WU Jianjun, QI Yaoguang, LIU Xinfu. Simulation of pumping valve motion based on simulink[J].China petroleum machinery,2011, 39(1): 32-35.(in Chinese)
[10]张玉林. 新型油气混输泵出口球阀滞后角的计算与分析[J]. 机械研究与应用, 2015(3): 55-58.
ZHANG Yulin. Calculation and analysis on lag angle of export ball valve in a new oil-gas multiphase pump[J]. Mechanical research & application, 2015(3): 55-58.(in Chinese)
[11]郑彩霞. 基于DFA的气液两相流特性分析[D]. 青岛:青岛科技大学, 2014.
[12]梁法春, 杨桂云, 王金龙,等. 气液两相流多喷嘴分流取样计量研究[J]. 中国石油大学学报(自然科学版), 2014(4): 143-147.
LIANG Fachun, YANG Guiyun, WANG Jinlong, et al. Gas-liquid two-phase flow metering using multi-nozzle sampler[J]. Journal of China University of Petroleum(edition of natural science),2014(4): 143-147.(in Chinese)