本文選題：自吸式反應(yīng)器　切入點：臨界吸氣轉(zhuǎn)速　出處：《華東理工大學(xué)》2016年碩士論文

【摘要】：自吸式反應(yīng)器具有結(jié)構(gòu)簡單、能耗小、傳質(zhì)性能好等優(yōu)點。分別研究了單層槳自吸式反應(yīng)器和雙層槳自吸式反應(yīng)器的流體力學(xué)特性,并進行了單層槳自吸式反應(yīng)器的CFD數(shù)值模擬研究。單層槳自吸式反應(yīng)器的流體力學(xué)特性：臨界轉(zhuǎn)速隨著攪拌器直徑的增大而減小,隨著浸沒深度的增大而增大；吸氣速率隨著攪拌轉(zhuǎn)速的增大而增大,隨著浸沒深度的增大而減小,存在吸氣效率最高點,擬合得到了吸氣速率的經(jīng)驗公式；整體氣含率和體積氧傳質(zhì)系數(shù)均隨著功率消耗的增加而增加；相對功率PG/P在轉(zhuǎn)速超過臨界吸氣轉(zhuǎn)速以后隨轉(zhuǎn)速增大而減小；臨界轉(zhuǎn)速隨著液體粘度的增加而增大,吸氣速率隨著液體粘度的增加而減小,吸氣效率最高點隨著液體粘度的增加,向單位體積功耗增大的方向偏移。雙層槳自吸式反應(yīng)器的流體力學(xué)特性：下層攪拌器形式對臨界吸氣轉(zhuǎn)速影響很��；采用軸流型下層攪拌器,吸氣速率隨著槳間距的增大先增大后減小,最佳槳間距為0.75D1。徑流型下層攪拌器,吸氣速率隨著槳間距的減小而增大；單位體積功耗下,反應(yīng)器整體氣含率的性能由下層攪拌器功率準數(shù)決定；相對功率PG/P,上翻式下層攪拌器下降較快,下壓式攪拌器下降較慢。建立了氣液兩相流(空氣-水)的數(shù)學(xué)模型,對單層槳自吸式反應(yīng)器的內(nèi)部流場分布、局部氣含率分布和壓力場分布進行了數(shù)值模擬研究,并將模擬結(jié)果和實驗結(jié)果進行了比較,兩者吻合較好,證明計算流體力學(xué)(CFD技術(shù))是進行各類自吸式反應(yīng)器優(yōu)化設(shè)計和放大的有效手段。
[Abstract]:The self-priming reactor has the advantages of simple structure, low energy consumption and good mass transfer performance.The hydrodynamic characteristics of single-layer propeller self-priming reactor and double-impeller self-priming reactor were studied, and the CFD numerical simulation of single-layer propeller self-priming reactor was carried out.The hydrodynamic characteristics of single-layer propeller self-priming reactor: the critical speed decreases with the increase of agitator diameter and increases with the increase of immersion depth, and the suction rate increases with the increase of stirring speed.With the increase of immersion depth, there exists the highest inspiratory efficiency, and the empirical formula of inspiratory rate is obtained by fitting, and the integral gas holdup and volumetric oxygen mass transfer coefficient increase with the increase of power consumption.The relative power PG/P decreases with the increase of the rotational speed, increases with the increase of the viscosity of the liquid, and decreases with the increase of the viscosity of the liquid.The peak of inspiratory efficiency shifts to the increase of unit volume power consumption with the increase of liquid viscosity.The hydrodynamic characteristics of double-layer propeller self-priming reactor: the form of lower layer agitator has little effect on the critical suction speed, and the suction rate increases first and then decreases with the increase of propeller spacing, and the optimum pitch is 0.75D1.Under the unit volume power consumption, the performance of the overall gas holdup of the reactor is determined by the power standard number of the lower layer agitator.The down-pressure agitator drops slowly.A mathematical model of gas-liquid two-phase flow (air-water) was established. The flow field distribution, local gas holdup distribution and pressure field distribution in single-layer propeller self-priming reactor were numerically simulated.The simulation results are compared with the experimental results. It is proved that computational fluid dynamics (CFD) is an effective method for optimal design and amplification of various self-priming reactors.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ027.2

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