单缸双作用往复式油气混输泵工作特性仿真分析

发布时间：2018-08-07 20:53

【摘要】：随着全球能源需求增长,当今世界经济对石油和天然气等能源的依赖越加强烈。油气混输技术作为一种高效、经济的油田输送方式近年来倍受各国关注。为了解决现有油气混输泵效率低、可靠性差和难以适应高含气、高压缩比油气混输工况的问题,满足油田消灭火炬,回收天然气的节能环保的急需,提出了一种新型往复式油气混输泵。鉴于目前单缸双作用往复式油气混输泵相关研究工作尚属起步阶段,本文主要从泵缸体内流场方面进行理论分析及仿真模拟研究,采用大型CFD软件Fluent对该新型混输泵的工作过程进行仿真模拟,初步掌握了该混输泵在气液两相工况下的工作特性。具体研究工作如下:(1)基于新型泵的实际需要,建立单缸双作用往复式油气混输泵的基本结构模型,并阐明该泵的结构特点和工作原理。(2)通过分析混输泵的动力端,对活塞进行运动学分析,得到其运动规律,进而得到理想情况下的流量公式,进一步得到混输泵每小时的理论流量值。(3)基于混输泵的实际结构,建立流场几何模型,采用标准的k-?湍流模型、动网格技术以及UDF用户自定义程序,对混输泵简化后的二维流场几何模型进行可视化的动态仿真研究。根据气液两相流理论以及研究流场的基本方法,得到内部流场的静压、速度和气液两相分布云图情况。验证了单缸双作用往复式油气混输泵的理论设计是较为成功的。(4)动态模拟进液腔流场的变化过程,一定时间步迭代完成后保存相应流量与压力数据,据此建立曲线图分析不同含气率下进液腔的瞬时流量与出入口瞬时压力变化,并计算往复式混输泵的流量脉动率变化,总结规律,为之后的研究提供数据支持。(5)新型混输泵效率与其他混输泵进行分析比较。
[Abstract]:As global energy demand grows, the world economy is increasingly dependent on energy such as oil and gas. As an efficient and economical oil field transportation technology, oil and gas mixed transportation technology has been paid more and more attention in recent years. In order to solve the problems of low efficiency, poor reliability and difficult to adapt to the condition of high gas content and high compression ratio of oil and gas mixed transportation pump, the oil field extinguishes the torch and recovers the natural gas, so as to meet the urgent need of energy saving and environmental protection. A new reciprocating oil and gas pump is presented. In view of the fact that the related research work of single cylinder and dual action reciprocating oil and gas pump is still in its infancy, the theoretical analysis and simulation study on the flow field in the cylinder block are carried out in this paper. A large scale CFD software Fluent was used to simulate the working process of the new hybrid pump, and the working characteristics of the hybrid pump under gas-liquid two-phase conditions were preliminarily grasped. The specific research works are as follows: (1) based on the actual needs of the new pump, the basic structure model of the single cylinder and dual action reciprocating oil / gas mixed pump is established, and the structural characteristics and working principle of the pump are expounded. (2) the power end of the pump is analyzed. The kinematics analysis of piston is carried out, and the law of motion is obtained, and then the flow formula under ideal conditions is obtained, and the theoretical flow rate per hour of the mixed pump is further obtained. (3) based on the actual structure of the pump, the geometric model of the flow field is established. Adopt the standard k-? The dynamic simulation of the simplified two-dimensional flow field geometry model of the hybrid pump is carried out by using the turbulence model, the dynamic grid technology and the UDF user-defined program. According to the theory of gas-liquid two-phase flow and the basic method to study the flow field, the hydrostatic pressure, velocity and gas-liquid two-phase distribution cloud picture of the internal flow field are obtained. The theoretical design of single cylinder and dual action reciprocating pump is proved to be more successful. (4) dynamic simulation of the flow field of the fluid inlet chamber is carried out, and the corresponding flow and pressure data are saved after the completion of a certain time step iteration. On the basis of this, the instantaneous flow rate and the instantaneous pressure at the inlet and outlet of the liquid chamber with different gas content are analyzed, and the flow pulsation rate of the reciprocating pump is calculated, and the rules are summarized. It provides data support for the later research. (5) the efficiency of the new hybrid pump is analyzed and compared with that of other mixed-transport pumps.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE974.1

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