發(fā)布時(shí)間：2018-03-21 15:56

  本文選題：混合過程　切入點(diǎn)：渦流反應(yīng)器　出處：《西安建筑科技大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：渦流反應(yīng)器是一種利用水力混合進(jìn)行水處理的設(shè)備，其混合效果的好壞直接影響著水處理的效果。渦流反應(yīng)器的優(yōu)點(diǎn)主要是無需機(jī)械設(shè)備，節(jié)省動(dòng)力費(fèi)用，但缺點(diǎn)是混合效果差于機(jī)械混合。本文通過數(shù)值模擬對(duì)渦流式混合反應(yīng)器的結(jié)構(gòu)進(jìn)行優(yōu)化，并對(duì)其內(nèi)部流場(chǎng)進(jìn)行分析，使得反應(yīng)器內(nèi)部產(chǎn)生水力回流，以強(qiáng)化渦流反應(yīng)器的混合效果。 采用區(qū)域網(wǎng)格劃分方法、利用結(jié)構(gòu)化網(wǎng)格和非結(jié)構(gòu)化網(wǎng)格相結(jié)合對(duì)反應(yīng)器進(jìn)行網(wǎng)格劃分。因流動(dòng)過程為紊態(tài)，，求解模型采用標(biāo)準(zhǔn)k模型，方程離散采用一階迎風(fēng)格式，流動(dòng)過程采用離散相模型�？刂茀�(shù)的求解選用SIMPLEC算法，其他的保持默認(rèn)數(shù)值和選項(xiàng)；代數(shù)方程的求解采用Guss-Seidle迭代法；通過建立常微分方程實(shí)現(xiàn)顆粒相的控制，并采用Gill算法。研究成果如下： （1）確定了反應(yīng)器的結(jié)構(gòu)和幾何參數(shù)。 反應(yīng)器設(shè)計(jì)時(shí)主要采用了文獻(xiàn)[27]中關(guān)于鐵水混合反應(yīng)的反應(yīng)器，將其應(yīng)用于水處理中，并通過模擬確定反應(yīng)器徑高比。模擬結(jié)果表明水流切向進(jìn)入反應(yīng)器后，與中心進(jìn)入反應(yīng)器的藥物一起邊旋轉(zhuǎn)邊向下流動(dòng)，并且在喉口下端形成了近壁回流區(qū)，使得反應(yīng)器的水力停留時(shí)間加長(zhǎng)，提高了混合效率，減少了藥物的投加量。 反應(yīng)器最佳幾何參數(shù)是：d_2/d_1=(0.03～0.07)；d_2/d_3=0.13～0.2；d_420mm；d_5100mm；h_1=(0.2～0.3)d_1；h_2=(0.33～0.5)d_1；h_3=(0.2～0.5)d_3；h_4=(3～4)d_3。其中第一柱體直徑為d_1，喉口直徑為d_2，第二柱體直徑為d_3，進(jìn)水口直徑為d_4，加藥口直徑為d_5，第一柱體高度為h_1，收縮椎體高度為h_2，擴(kuò)張椎體高度為h_3，第二柱體高度為h_4。 （2）確定了不同反應(yīng)器容積時(shí)的邊界流速。 當(dāng)反應(yīng)器有效容積為12.3L時(shí)，最低入水速度為0.07m/s，最大入水速度為1.5m/s。當(dāng)反應(yīng)器大小為12.3m3和41.5m3時(shí)，也可得到良好的混合效果，證明該反應(yīng)器改變體積后，可以處理不同的水量，但進(jìn)水口直徑不宜大于300mm。 （3）探討了該反應(yīng)器用于實(shí)際工程的可行性。 計(jì)算了當(dāng)反應(yīng)器有效容積為41.5m3時(shí)，鋼筋混凝土材質(zhì)和鋼板材質(zhì)的反應(yīng)器的成本，計(jì)算得知鋼筋混凝土材質(zhì)制作成本為16.48萬元，鋼板材質(zhì)制作成本為3.6萬元。鋼板材質(zhì)的反應(yīng)器制作費(fèi)用比鋼筋混凝土材質(zhì)更經(jīng)濟(jì)，而且安裝拆卸方便，但是鋼板材質(zhì)的反應(yīng)器容易生銹，因此需做防銹處理或定期清潔。對(duì)該反應(yīng)器進(jìn)行了工程概預(yù)算結(jié)果表明，水處理費(fèi)用為0.92元/d，比一般水處理費(fèi)用1.2元/d低，節(jié)省了處理成本和能源。 該反應(yīng)器可廣泛應(yīng)用在不同領(lǐng)域，包括有實(shí)驗(yàn)室廢水處理、飲用水處理、工業(yè)水處理、再生回用水處理、小型城鎮(zhèn)水處理、化工領(lǐng)域等所有涉及固液混合和液液混合的場(chǎng)合。相比于現(xiàn)有的絮凝池和機(jī)械攪拌澄清池，該反應(yīng)器其優(yōu)點(diǎn)主要是：無攪拌設(shè)備、反應(yīng)器內(nèi)部產(chǎn)生水力回流、混合時(shí)間短、藥物投加量少、混合效果好。
[Abstract]:Eddy current reactor is a kind of equipment for water treatment by hydraulic mixing, and its mixing effect directly affects the effect of water treatment. The advantage of eddy current reactor is that it does not need mechanical equipment and saves power cost. In this paper, the structure of eddy current mixing reactor is optimized by numerical simulation, and its internal flow field is analyzed. In order to enhance the mixing effect of eddy current reactor. In this paper, the method of regional mesh generation is adopted, and the reactor is meshed by the combination of structured grid and unstructured grid. Because the flow process is in an orderly state, the standard k model is used to solve the model and the first order upwind scheme is used to discretize the equations. The discrete phase model is used for the flow process, the SIMPLEC algorithm is used to solve the control parameters, the default values and options are kept for the others, the Guss-Seidle iteration method is used to solve the algebraic equations, and the particle phase control is realized by establishing ordinary differential equations. The research results are as follows:. The structure and geometric parameters of the reactor were determined. In the design of the reactor, the reactor about the mixed reaction of hot metal in reference [27] was mainly used in the water treatment, and the ratio of diameter to height of the reactor was determined by simulation. The simulation results showed that the flow direction was tangent into the reactor. Along with the drug entering the reactor, it rotates and flows down, and forms a near wall reflux zone at the lower end of the throat, which makes the HRT of the reactor longer, improves the mixing efficiency, and reduces the dosage of the drug. The best geometric parameters of the reactor are: 0. 02 / d1 / 0. 07 / d / 2 / d3 / d3 / 3 0.130.32 / d 420mm / d5100mm / h110.2n / 0.3d1d1h2/ 0.330.5d / 1h3h3/ 0.20.5d-1 / d / 3 / d / d / d / d / 3 / d / d / d / d / d / d / d / d / d / d / d / d / d / d _ 2 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 3 / d _ 2 / d _ 3 / d _ 3 / d _ 3 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2 / d _ 2. The height is h3 and the second cylinder is h4. The boundary velocities of different reactor volumes were determined. When the effective volume of the reactor is 12.3 L, the minimum inlet velocity is 0.07 m / s, and the maximum inlet velocity is 1.5 m / s. When the reactor size is 12.3m3 and 41.5m3, the mixing effect can also be obtained. It is proved that the reactor can deal with different amounts of water when the volume is changed. However, the diameter of the inlet should not be greater than 300 mm. The feasibility of using the reactor in practical engineering is discussed. When the effective volume of the reactor is 41.5m3, the cost of the reactor with reinforced concrete material and steel plate material is calculated. It is found that the production cost of reinforced concrete material is 164800 yuan. The production cost of the steel plate material is 36,000 yuan. The production cost of the steel plate reactor is more economical than that of the reinforced concrete material, and it is easy to install and disassemble, but the steel plate material reactor is prone to rust. The result shows that the cost of water treatment is 0.92 yuan / d, which is lower than that of common water treatment cost 1.2 yuan / d, saving the treatment cost and energy. The reactor can be widely used in a variety of fields, including laboratory wastewater treatment, drinking water treatment, industrial water treatment, recycled water treatment, small town water treatment, Compared with the existing flocculation tank and mechanical stirring clarifier, this reactor has the advantages of no mixing equipment, hydraulic reflux in the reactor, and short mixing time. The drug dosage is less and the mixing effect is good.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU991.2

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