本文選題：折流式旋轉(zhuǎn)床 + CFD��； 參考：《浙江工業(yè)大學(xué)》2016年碩士論文

【摘要】：折流式旋轉(zhuǎn)床是一種新型的高效氣液接觸裝置,它以離心力場(chǎng)代替重力場(chǎng),極大的增大了傳質(zhì)比表面積,從而增加了傳質(zhì)效率。本文通過(guò)建立裝置的二維、三維模型,利用CFD方法對(duì)裝置內(nèi)的氣液流動(dòng)狀況、壓力分布情況等進(jìn)行研究,并與實(shí)驗(yàn)測(cè)試結(jié)果進(jìn)行對(duì)比驗(yàn)證,可為裝置結(jié)構(gòu)改進(jìn)提供參考。本文主要研究?jī)?nèi)容及研究結(jié)果如下所示:(1)成功將FLUENT引入折流式旋轉(zhuǎn)床的研究工作中,極大地縮短了研究進(jìn)程;首次對(duì)裝置全尺寸展開(kāi)二維、三維模擬工作。模擬結(jié)果與實(shí)驗(yàn)結(jié)果相互對(duì)比驗(yàn)證,平均誤差在10%以內(nèi),模擬結(jié)果較好;(2)裝置內(nèi)氣體流動(dòng)狀況。氣流主要以切向速度為主(占80%以上),由轉(zhuǎn)子外緣向內(nèi)部流動(dòng)過(guò)程中,氣速逐漸降低,這主要是由拐彎處的摩擦阻力引起的;在轉(zhuǎn)子外緣存在較大的速度梯度,易造成能量損失;液體在裝置內(nèi)主要是以液膜、液滴的形式存在,極大的增大了傳質(zhì)比表面積,并且液體的加入使得靜圈下隙和氣體出口處的漩渦明顯減小;不論是氣相流動(dòng)還是液相流動(dòng),都受進(jìn)氣量、進(jìn)液量、轉(zhuǎn)速以及裝置結(jié)構(gòu)的影響;(3)裝置內(nèi)壓降分布情況。壓降絕大多數(shù)是由轉(zhuǎn)子處壓降貢獻(xiàn)的,轉(zhuǎn)子壓降隨進(jìn)氣量、進(jìn)液量、轉(zhuǎn)速的增加而增大,轉(zhuǎn)速的增加會(huì)使得液滴數(shù)量增大,利于傳質(zhì)進(jìn)行;進(jìn)氣量的增大易造成轉(zhuǎn)子內(nèi)氣速較大,使得裝置內(nèi)持液量增大,轉(zhuǎn)子內(nèi)液滴被吹出轉(zhuǎn)子,造成霧沫夾帶;而進(jìn)液量的增加會(huì)使得流道變得更窄,氣速隨之增加,也會(huì)造成持液量增加和霧沫夾帶,因此也不利于傳質(zhì)進(jìn)行;(4)結(jié)構(gòu)改進(jìn)。通過(guò)模擬發(fā)現(xiàn),在操作工況下,裝置內(nèi)漩渦可以通過(guò)加裝導(dǎo)流板的形式削減,傾斜氣體進(jìn)口比垂直進(jìn)口更有利于氣體進(jìn)入轉(zhuǎn)子,減小轉(zhuǎn)子外緣處的速度,較小能量損失。本文研究了折流式旋轉(zhuǎn)床的流動(dòng)狀態(tài)、壓降分布狀況,為弄清裝置傳質(zhì)機(jī)理,進(jìn)而改進(jìn)裝置結(jié)構(gòu)、提高傳質(zhì)性能提供參考。
[Abstract]:The baffled rotating bed is a new type of high efficiency gas-liquid contact device, which uses centrifugal force field instead of gravity field, which greatly increases the specific surface area of mass transfer and thus increases the mass transfer efficiency. In this paper, the two-dimensional and three-dimensional models of the device are established, and the gas-liquid flow and pressure distribution in the device are studied by CFD method, and the results are compared with the experimental results, which can provide a reference for the improvement of the device structure. In this paper, the main research contents and results are as follows: 1) fluent is successfully introduced into the research work of the baffled rotating bed, which greatly shortens the research process. For the first time, 2D and 3D simulation work on the full scale of the device is carried out. Compared with the experimental results, the average error is less than 10%. The simulation results show that the gas flow in the device is better. The main flow velocity is tangential velocity (more than 80%). During the flow from the outer edge of the rotor to the inside, the gas velocity decreases gradually, which is mainly caused by the friction resistance at the corner, and there is a large velocity gradient on the outer edge of the rotor. The liquid exists mainly in the form of liquid film and droplet, which greatly increases the specific surface area of mass transfer, and the vortex at the bottom of the static circle and the exit of the gas decreases obviously with the addition of liquid. The pressure drop distribution in the device is affected by the air intake, liquid intake, rotational speed and the structure of the device, regardless of the gas or liquid phase flow. Most of the pressure drop is contributed by the rotor pressure drop, the rotor pressure drop increases with the increase of air intake, liquid intake and rotational speed, and the increase of rotational speed will increase the number of droplets, which is conducive to mass transfer. The increase of air intake will easily result in a larger gas velocity in the rotor, which will increase the liquid holdup in the device, and the droplets in the rotor will be blown out of the rotor, resulting in entrainment of mist foam; and the increase in the intake volume will make the flow channel narrower and the gas velocity will increase. It also leads to the increase of liquid holding capacity and entrainment of aerosol, which is not conducive to the improvement of mass transfer. It is found by simulation that the swirl in the device can be reduced by adding a guide plate under the operating conditions, and the inlet of inclined gas is more favorable to the entry of gas into the rotor than the vertical inlet, and the velocity at the outer edge of the rotor is reduced, and the energy loss is smaller. In this paper, the flow state and pressure drop distribution of the baffled rotating bed are studied, which provides a reference for clarifying the mass transfer mechanism of the device, improving the device structure and improving the mass transfer performance.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ051.1

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