某压力调节阀内部流场的数值模拟及优化分析

发布时间：2018-02-22 23:09

本文关键词： 压力调节阀对接可靠性数值模拟优化分析　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国炼油工业技术的发展,现在国内已经基本上形成了以干线管道为主骨架的成品油管道网,当要对一些局部地区临时提供油料时即可通过连接装配式输油管线来从成品油管道中导出油料。为了适应长距离的输送情况,成品油管线中的流体压力一般高于10MPa,而装配式输油管线则为了便于运输和安装采取轻量化设计,所允许的工作压力一般在6MPa以下。故为了保证整条临时供油管线的工作安全,在导出油料时需要使用压力调节阀作为压力转换装置来保护成品油管线和装配式输油管线,因此深入了解压力调节阀在对接工作时的内部流场情况、判断压力调节阀在工作中的安全可靠性就显得尤为重要。本文即针对一种设计用于成品油管线与装配式输油管线对接中的压力调节阀主要做了以下工作：1.根据调节阀相关理论知识及实际工作时的对接工况分析出本课题所研究压力调节阀的结构特点、工作原理及相关特性。2.对初设计压力调节阀内部流场进行仿真模拟计算,得到初设计结构在对接工作条件下内部流场速度、压力、流线等的分布情况,并分析得到其计算流量特性曲线,根据模拟结果及工作要求,确定初设计结构可以安全可靠的用于对接工作中。3.对改进后的压力调节阀内部流场进行仿真模拟,得到改进后结构在对接工作条件下的内部流场可视化图形及流量特性曲线,根据仿真结果及工作要求确定改进后的压力调节阀的工作安全可靠性,同时对改进后的压力调节阀进行试验,试验与模拟结果进行对比得出二者的趋势一致,进而验证了模拟方法的正确可靠性。4.对比改进前后两种结构下的压力调节阀内部流场及相关特性参数,说明齿形串级结构对整个阀内部流场的节流减压、防止空化等的影响。5.根据工程情况及对接工作中的可靠性要求,对改进后压力调节阀的二级节流孔形状进行优化设计,同样对优化方案进行模拟分析并与优化前相对比,得出优化后方案的优势,为这种压力调节阀日后能够更好、更安全可靠地用于对接输油工作中提供借鉴。
[Abstract]:With the development of oil refining technology in China, a network of refined oil pipelines with backbone as the backbone has been basically formed in China. When temporary oil supplies are to be provided to some local areas, oil can be derived from finished oil pipelines by connecting assembly pipelines. The fluid pressure in the finished oil pipeline is generally higher than 10 MPA, and the working pressure is generally less than 6 MPA in order to facilitate the transportation and installation of the assembly pipeline, so as to ensure the safety of the whole temporary oil supply pipeline, It is necessary to use the pressure regulating valve as the pressure conversion device to protect the finished oil pipeline and the assembled oil pipeline when the oil is exported. Therefore, the internal flow field of the pressure regulating valve in the docking operation is deeply understood. It is very important to judge the safety and reliability of pressure regulating valve in work. In this paper, we mainly do the following work: 1. The related theory knowledge of the throttling valve and the docking condition of the practical work have analyzed the structural characteristics of the pressure regulating valve studied in this subject. The internal flow field of the initial design pressure regulating valve is simulated and calculated, and the distribution of the velocity, pressure, streamline and so on of the initial design structure under the condition of docking operation is obtained. According to the simulation results and working requirements, it is determined that the initial design structure can be safely and reliably used in docking. 3. The internal flow field of the improved pressure regulating valve is simulated. The visual figure of internal flow field and flow characteristic curve of the improved structure under the condition of docking operation are obtained, and the safety and reliability of the improved pressure regulating valve are determined according to the simulation results and the working requirements. At the same time, the improved pressure regulating valve is tested, and the results of test and simulation show that the trend is the same. Furthermore, the correct reliability of the simulation method is verified. 4. Comparing the internal flow field and related characteristic parameters of the pressure regulating valve with the two structures before and after the improvement, the throttling decompression of the tooth profile cascade structure to the whole internal flow field of the valve is explained. According to the engineering conditions and reliability requirements in docking work, the shape of the secondary throttling hole of the improved pressure regulating valve is optimized, and the optimization scheme is simulated and analyzed and compared with that before the optimization. The advantages of the optimized scheme can provide a reference for the pressure regulating valve to be used in docking and transporting oil more safely and reliably in the future.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE967

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