本文選題：沉淀池 + 數(shù)值模擬�。� 參考：《太原科技大學(xué)》2015年碩士論文

【摘要】：沉淀池是水處理中重要的構(gòu)筑物,其固液分離的效果直接影響著處理系統(tǒng)對(duì)固體懸浮顆粒物的去除效率。但是沉淀池中流態(tài)變化多樣,不僅有自身湍流作用的影響,沉淀顆粒的密度、粒徑、粘度等也會(huì)對(duì)它的運(yùn)行造成影響。沉淀池固液兩相流的數(shù)值模擬是研究沉淀池水力特性及沉降特性的重要方法,對(duì)沉淀池的優(yōu)化設(shè)計(jì)有重要的參考價(jià)值。本文通過實(shí)驗(yàn)確定了固體顆粒的密度、固體顆粒粒度分布;建立了沉淀池內(nèi)固體絮凝團(tuán)的沉降速度模型,其沉降速度與濃度的關(guān)系符合Vesilind沉降速度模型,并通過數(shù)值擬合技術(shù)得到能夠反映特定物料的沉降速度模型。固體沉降過程中液體粘度隨固體濃度的變化而變化,粘度的變化將會(huì)對(duì)液體的流動(dòng)狀態(tài)產(chǎn)生很大的影響,同時(shí),對(duì)固體的沉降性能和壓縮性能產(chǎn)生影響。本文通過流變學(xué)實(shí)驗(yàn),確定了不同固體濃度時(shí)液體的粘度,為沉淀池CFD分析提供了可靠的參數(shù)。根據(jù)上述實(shí)驗(yàn),將CFD兩相流k-Epsilon湍流模型、歐拉多相流模型和沉降速度及粘度進(jìn)行耦合,實(shí)現(xiàn)了固體的沉降及粘度變化。以實(shí)驗(yàn)室小型豎流沉淀池為研究對(duì)象,采用計(jì)算流體力學(xué)分析軟件ANSYS CFX對(duì)其進(jìn)行數(shù)值計(jì)算。模擬并分析了沉淀池內(nèi)流場(chǎng)與固體濃度的分布。選取合適的測(cè)定斷面,通過實(shí)驗(yàn)測(cè)定,取得實(shí)驗(yàn)數(shù)據(jù),并與模擬結(jié)果進(jìn)行比較。模擬結(jié)果與實(shí)驗(yàn)數(shù)據(jù)基本吻合,證明所建立的數(shù)學(xué)模型能夠反映沉淀池的實(shí)際運(yùn)行狀態(tài),可為沉淀池的設(shè)計(jì)提供理論依據(jù)。
[Abstract]:Sedimentation tank is an important structure in water treatment. The effect of solid-liquid separation directly affects the removal efficiency of solid suspended particulates in the treatment system. However, the flow state in the sedimentation tank is varied, which has not only the effect of its own turbulence, but also the density, particle size and viscosity of the precipitate particles. The numerical simulation of solid-liquid two-phase flow in sedimentation tank is an important method to study the hydraulic characteristics and settlement characteristics of sedimentation tank, which has important reference value for the optimum design of sedimentation tank. In this paper, the density and particle size distribution of solid particles are determined by experiments, and the settling velocity model of solid flocculation in sedimentation tank is established. The relationship between settling velocity and concentration is in accord with Vesilind settling velocity model. The settlement velocity model which can reflect the specific material is obtained by numerical fitting technique. In the process of solid settlement, the viscosity of liquid varies with the concentration of solid, and the change of viscosity will have a great influence on the flow state of liquid, at the same time, on the settling performance and compressibility of solid. In this paper, the viscosity of liquid with different solid concentration is determined by rheological experiment, which provides reliable parameters for CFD analysis of sedimentation tank. According to the above experiments, the k-Epsilon turbulence model and the Euler multiphase flow model of CFD two-phase flow are coupled with the settling velocity and viscosity to realize the settlement and viscosity changes of solids. In this paper, a small vertical flow sedimentation tank in laboratory is studied. The numerical calculation is carried out by using CFX software ANSYS. The distribution of flow field and solid concentration in the sedimentation tank was simulated and analyzed. The experimental data were obtained by selecting the appropriate section and comparing with the simulation results. The simulation results are in good agreement with the experimental data. It is proved that the established mathematical model can reflect the actual operating state of the sedimentation tank and provide a theoretical basis for the design of the sedimentation tank.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703

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