本文關鍵詞：“L”型多孔緩沖進油工藝研究　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 儲油罐 “L”型多孔緩沖進油管 數值模擬 正交試驗 湍動能 含水量

【摘要】：隨著汽車工業(yè)的迅猛發(fā)展,使得加油站競爭更為激烈。卸油期間停止加油,嚴重影響了加油站勞動生產率,因此,探尋如何在保證油品質量、安全的前提下,提高服務水平,提升競爭力,成為了各成品油零售企業(yè)亟待解決的問題�！癓”型多孔緩沖進油管采用多孔出流的方式進油,有效地減緩了出流油品對罐內油品、罐底水雜的沖擊和攪動,可以實現卸油加油同時作業(yè)。 以計算流體力學方法為基礎,采用FLUENT軟件對儲油罐內部流場進行了三維數值模擬計算,以改善罐內流體的流動特性為目標(即減小出油管入口附近區(qū)域流體的湍動能和出油管抽出油品的含水量),分析了“L”型多孔緩沖進油管各設計參數對罐內流場的影響,并對其進行了優(yōu)化。本文主要開展了以下幾個方面的工作： (1)對加油站傳統(tǒng)進油工藝(“I”型進油工藝和“J”型進油工藝)進行了分析研究,提出了“L”型多孔緩沖進油管的初步設計方案； (2)針對加油站常用30m3臥式儲油罐的幾何結構作了分析簡化,并對該模型采用了合理的網格劃分；選取RNG κ-ε模型作為湍流模型、混合物模型作為多相流模型； (3)研究了三種進油工藝下儲罐內部油品的流動特性,重點分析了出油管入口附近流體的流動行為,表明了“L”型進油工藝的可行性和優(yōu)越性；結合不同進油工藝的模擬結果,分析了三種進油工藝靜電的產生和靜電事故的成因,提出了靜電預防措施； (4)確定了將進油管的安裝高度(進油管水平段距底高度)、進油管的管徑以及進油管水平段開孔大小、個數、間距和方向等六個影響因素作為“L”型多孔緩沖進油管研究的重點,以此來確定進油管的最佳設計參數； (5)運用正交試驗設計法,合理地確定了“L”型進油管各設計參數的因素和水平,利用極差分析法對25組數值模擬結果進行了分析,分別得到了各設計參數對湍動能和含水量影響的主次順序；結合綜合平衡法,繪制了各因素對湍動能和含水量的影響曲線,確定了“L”型多孔緩沖進油管各設計參數的最優(yōu)值,并對其進行了驗證性模擬試驗； (6)對設計參數優(yōu)化后的“L”型多孔緩沖進油管進行了現場應用試驗,驗證了數值計算方法的準確性和可靠性；同時,也表明了優(yōu)化方案的合理性和實用性。 研究結果表明：“L”型多孔緩沖進油管具有減緩油品進油流速、降低流體質點間擾動程度以及提高抽出油品質量等特點；采用正交試驗法優(yōu)化得到的最優(yōu)設計參數方案,可以使出油管入口附近區(qū)域流體的湍動能減少至0.003154m2.s-2,出油管抽出油品的含油濃度提高至99.23%,與優(yōu)化前相比,湍動程度降低3.10%,油品質量提高0.04%。
[Abstract]:With the rapid development of automobile industry, the competition of gas stations becomes more fierce. Stopping refueling during unloading seriously affects the labor productivity of gas stations. Therefore, how to ensure the quality and safety of oil products is explored. Improving the service level and enhancing the competitiveness has become an urgent problem to be solved by all the refined oil retail enterprises. The "L" type porous buffered oil intake pipe uses the porous outlet way to feed the oil. It can effectively slow down the impingement and agitation of the oil in the tank and the bottom water of the tank, and can realize the simultaneous operation of unloading and refueling. Based on the computational fluid dynamics (CFD) method, the three-dimensional numerical simulation of the internal flow field of the oil tank is carried out by using FLUENT software. The aim is to improve the flow characteristics of the fluid in the tank (that is to reduce the turbulent kinetic energy of the fluid near the inlet of the tubing and the water content of the oil extracted from the tubing). The influence of the design parameters of "L" type porous buffer tubing on the flow field in the tank is analyzed and optimized. The main work of this paper is as follows: 1) the traditional oil intake process ("I" type oil intake process and "J" type oil intake process) is analyzed and studied, and the preliminary design scheme of "L" type porous buffered oil intake pipe is put forward. (2) the geometric structure of 30m3 horizontal oil storage tank used in gas station is analyzed and simplified, and the reasonable mesh division is adopted for the model. RNG 魏-蔚 model is chosen as turbulence model and mixture model as multiphase flow model. In this paper, the flow characteristics of oil products in the tank under three kinds of oil injection processes are studied, and the flow behavior of the fluid near the inlet of the oil outlet pipe is emphatically analyzed, which shows the feasibility and superiority of the "L" type oil injection process. Combined with the simulation results of different oil injection processes, the causes of electrostatic generation and electrostatic accident in three kinds of oil injection processes are analyzed, and the preventive measures of electrostatic electricity are put forward. The installation height of the oil intake pipe (the horizontal section of the oil inlet line is from the bottom height, the pipe diameter of the oil inlet line and the size and number of holes in the horizontal section of the oil inlet line are determined. Six influencing factors, such as spacing and direction, are the key points in the study of "L" type porous buffered tubing, so as to determine the optimum design parameters of the pipeline. 5) the factors and levels of the design parameters of "L" type oil intake pipe are reasonably determined by using the orthogonal test design method, and 25 groups of numerical simulation results are analyzed by using the range analysis method. The primary and secondary order of the effects of the design parameters on the turbulent kinetic energy and water content are obtained respectively. Combined with the comprehensive equilibrium method, the influence curves of various factors on turbulent kinetic energy and water content were drawn, and the optimum design parameters of the "L" type porous buffered tubing were determined, and verified simulation tests were carried out. (6) the field application test of the "L" type porous buffered tubing after the optimization of design parameters is carried out, and the accuracy and reliability of the numerical calculation method are verified. At the same time, it also shows the rationality and practicability of the optimized scheme. The results show that the "L" type porous buffer oil intake pipe has the characteristics of slowing down the oil intake velocity, reducing the disturbance degree between the fluid particles and improving the quality of the extracted oil. The optimal design parameters obtained by orthogonal test method can reduce the turbulent kinetic energy of the fluid near the inlet of the tubing to 0.003154m2.s-2. The oil concentration of the oil extracted from the tubing was increased to 99.23. Compared with before optimization, the turbulence degree was reduced by 3.10 and the oil quality was improved by 0.04%.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE972

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