本文選題：過濾器 + 壓降��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：目前,袋式過濾器廣泛應(yīng)用于各領(lǐng)域,袋式過濾器在使用過程中,為了保證其過濾效果需要不間斷的對過濾器進出口的壓差進行測量,當二者之間壓差不滿足其過濾要求時,將嚴重影響過濾器的過濾效果,因此,對過濾袋的壓降進行仿真分析,判斷影響壓降的主要因素,給出其壓降變化規(guī)律,并根據(jù)預(yù)測及時更換濾袋,保證過濾器的高效工作,有助于袋式過濾器在油田領(lǐng)域的廣泛應(yīng)用。本文通過建立流體流動數(shù)學(xué)模型,考慮流體在過濾器中的流動狀態(tài)為湍流流動,因此,建立了湍流流動狀態(tài)下流體動力學(xué)模型,對其流動狀態(tài)進行分析。并對所建模型進行自適應(yīng)四面體網(wǎng)格的劃分,網(wǎng)格劃分采用ANSYS ICEM CFD軟件,主要對過濾器的通流部分進行了網(wǎng)格細化,并對劃分后的網(wǎng)格進行質(zhì)量檢查,使過濾器的主要部件的網(wǎng)格性能能夠滿足CFX(計算流體動力學(xué)軟件)對網(wǎng)格質(zhì)量的要求,有利保證有限元計算的精度。在此基礎(chǔ)上通過CFX數(shù)值仿真軟件對流體流動狀態(tài)進行數(shù)值計算,進而得到過濾器的壓降影響因素。通過對孔隙度-速度矢量分布圖、孔隙度-總壓分布圖、孔隙度-流線分布圖進行分析,建立了孔隙度壓降相關(guān)性曲線圖,并分析孔隙度對壓降的影響規(guī)律。采用相同的方法繪制出口壓力、出口流速、粘性等與壓降的相關(guān)性曲線,進而對單過濾袋的壓降影響規(guī)律進行分析。通過計算可知:單過濾袋及五過濾袋的壓降隨孔隙度、出口壓力、出口流量及粘度的變化規(guī)律基本相同。過濾器內(nèi)部壓降隨著孔隙度的增加呈現(xiàn)出先增加后減小的趨勢,但從整體上體來說,總壓損失變化較小。隨著出口壓力增加,過濾袋內(nèi)的壓降逐漸增加,當出口壓力增加到1.5MPa后,壓力逐漸趨于穩(wěn)定,壓降無明顯變化。隨著出口流速的增加,壓力損失急劇增加,二者相關(guān)性近似為線性。隨著粘度的增加,壓力降增加,整體曲線近似線性地正比例增加。
[Abstract]:At present, bag filter is widely used in various fields. In order to ensure the filtering effect of bag filter, it is necessary to measure the pressure difference of filter inlet and outlet continuously in order to ensure its filtering effect, when the pressure difference between them does not meet its filtration requirements. Therefore, the pressure drop of the filter bag is simulated and analyzed, the main factors affecting the pressure drop are judged, the variation law of the pressure drop is given, and the filter bag is replaced in time according to the prediction to ensure the high efficiency of the filter. It is helpful for the wide application of bag filter in the field of oil field. In this paper, a mathematical model of fluid flow is established, considering that the flow state of a fluid in a filter is turbulent flow. Therefore, a hydrodynamic model in turbulent flow state is established, and its flow state is analyzed. The model is divided into adaptive tetrahedron mesh. ANSYS ICEM CFD software is used to divide the mesh. The flow section of the filter is refined, and the quality of the divided mesh is checked. The mesh performance of the main components of the filter can meet the requirements of CFX (computational fluid dynamics software) for mesh quality, which is beneficial to ensure the accuracy of finite element calculation. On this basis, the fluid flow state is numerically calculated by CFX numerical simulation software, and the influence factors of filter pressure drop are obtained. Based on the analysis of porosity velocity vector distribution, porosity total pressure distribution and porosity streamline distribution, the correlation curve of porosity pressure drop is established, and the influence of porosity on pressure drop is analyzed. The correlation curves of outlet pressure, outlet velocity, viscosity and pressure drop were drawn by the same method, and the influence law of pressure drop on single filter bag was analyzed. The pressure drop of single filter bag and five filter bag is basically the same with porosity, outlet pressure, outlet flow rate and viscosity. The internal pressure drop of the filter increases first and then decreases with the increase of porosity, but the total pressure loss changes little from the whole upper body. With the increase of the outlet pressure, the pressure drop in the filter bag increases gradually. When the outlet pressure increases to 1.5 MPA, the pressure gradually tends to stabilize, and the pressure drop has no obvious change. With the increase of outlet velocity, the pressure loss increases sharply, and the correlation between them is approximately linear. With the increase of viscosity, the pressure drop increases, and the integral curve increases linearly in proportion.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE937

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本文編號：2023725