發(fā)布時(shí)間：2018-08-07 20:53

【摘要】：隨著全球能源需求增長(zhǎng),當(dāng)今世界經(jīng)濟(jì)對(duì)石油和天然氣等能源的依賴越加強(qiáng)烈。油氣混輸技術(shù)作為一種高效、經(jīng)濟(jì)的油田輸送方式近年來(lái)倍受各國(guó)關(guān)注。為了解決現(xiàn)有油氣混輸泵效率低、可靠性差和難以適應(yīng)高含氣、高壓縮比油氣混輸工況的問(wèn)題,滿足油田消滅火炬,回收天然氣的節(jié)能環(huán)保的急需,提出了一種新型往復(fù)式油氣混輸泵。鑒于目前單缸雙作用往復(fù)式油氣混輸泵相關(guān)研究工作尚屬起步階段,本文主要從泵缸體內(nèi)流場(chǎng)方面進(jìn)行理論分析及仿真模擬研究,采用大型CFD軟件Fluent對(duì)該新型混輸泵的工作過(guò)程進(jìn)行仿真模擬,初步掌握了該混輸泵在氣液兩相工況下的工作特性。具體研究工作如下:(1)基于新型泵的實(shí)際需要,建立單缸雙作用往復(fù)式油氣混輸泵的基本結(jié)構(gòu)模型,并闡明該泵的結(jié)構(gòu)特點(diǎn)和工作原理。(2)通過(guò)分析混輸泵的動(dòng)力端,對(duì)活塞進(jìn)行運(yùn)動(dòng)學(xué)分析,得到其運(yùn)動(dòng)規(guī)律,進(jìn)而得到理想情況下的流量公式,進(jìn)一步得到混輸泵每小時(shí)的理論流量值。(3)基于混輸泵的實(shí)際結(jié)構(gòu),建立流場(chǎng)幾何模型,采用標(biāo)準(zhǔn)的k-?湍流模型、動(dòng)網(wǎng)格技術(shù)以及UDF用戶自定義程序,對(duì)混輸泵簡(jiǎn)化后的二維流場(chǎng)幾何模型進(jìn)行可視化的動(dòng)態(tài)仿真研究。根據(jù)氣液兩相流理論以及研究流場(chǎng)的基本方法,得到內(nèi)部流場(chǎng)的靜壓、速度和氣液兩相分布云圖情況。驗(yàn)證了單缸雙作用往復(fù)式油氣混輸泵的理論設(shè)計(jì)是較為成功的。(4)動(dòng)態(tài)模擬進(jìn)液腔流場(chǎng)的變化過(guò)程,一定時(shí)間步迭代完成后保存相應(yīng)流量與壓力數(shù)據(jù),據(jù)此建立曲線圖分析不同含氣率下進(jìn)液腔的瞬時(shí)流量與出入口瞬時(shí)壓力變化,并計(jì)算往復(fù)式混輸泵的流量脈動(dòng)率變化,總結(jié)規(guī)律,為之后的研究提供數(shù)據(jù)支持。(5)新型混輸泵效率與其他混輸泵進(jìn)行分析比較。
[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.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TE974.1

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本文編號(hào)：2171315