本文選題：旋流器　切入點：串聯(lián)　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：旋流器作為一種分離設(shè)備在選煤、化工、環(huán)保等工業(yè)領(lǐng)域有著廣泛的應(yīng)用，因為它具有結(jié)構(gòu)簡單、易于操作、低占用面積、可靠耐用、零轉(zhuǎn)動部件且便于維修等優(yōu)點。有時，為了工業(yè)生產(chǎn)的需要或者達到某些特定目的，需要將多個旋流器組合使用，例如串聯(lián)、并聯(lián)等。如果需要對某個旋流器的溢流產(chǎn)品繼續(xù)分選或者分級，，則需要在該旋流器溢流出口串聯(lián)相應(yīng)的旋流器，以繼續(xù)進行分選或者分級，該兩段旋流器系統(tǒng)通常被稱為溢流直連的三產(chǎn)品旋流器系統(tǒng)。溢流直連的三產(chǎn)品旋流器系統(tǒng)存在的一個根本問題是一段旋流器的溢流往往是高速旋轉(zhuǎn)的渦流，而這種渦流將對二段旋流器的分選/分級性能產(chǎn)生何種影響則較少有學(xué)者涉及。由于溢流直連的三產(chǎn)品旋流器系統(tǒng)在很多作業(yè)單位存在應(yīng)用，研究渦流入料對旋流器分選/分級性能的影響以及如何消除一段旋流器溢流的渦流、提高溢流直連的三產(chǎn)品旋流器系統(tǒng)總體的工藝性能是十分有必要的。 本研究首先利用特定的裝置（實際為入口規(guī)格不同、底流口封死的兩個分選旋流器）產(chǎn)生了兩種渦流強度不同的溢流，將它們作為分級旋流器的入料，連同直流入料的情況，共得到三種不同渦流強度入料（流量相同）條件下分級旋流器的分級效果。比較得到的分級曲線發(fā)現(xiàn)，分級旋流器的分級性能隨著入料渦流強度的增大而降低。 在搞清渦流入料對旋流器分級性能的危害以后，一十字葉片裝置被安裝在一段分選旋流器與二段分級旋流器之間的連接管路中，以圖消除一段溢流的渦流、提高二段分級效率和提高該三產(chǎn)品旋流器系統(tǒng)的總體工藝性能。試驗結(jié)果表明，十字葉片裝置可有效消除一段溢流的渦流、提高二段分級效率，然而，它也會對一段溢流造成一定的阻力、導(dǎo)致一段底流口出料量加大。 針對十字葉片裝置對一段溢流阻力較大的問題，我們設(shè)計了兩種新型的螺旋導(dǎo)流葉片裝置，一為空心十字葉片，另一為螺旋導(dǎo)流葉片。試驗結(jié)果表明，就二段分級旋流器分級效果而言，在粗顆粒分級效率都接近100%的前提下，安裝螺旋導(dǎo)流葉片底流細粒夾帶現(xiàn)象更輕，同時，螺旋導(dǎo)流葉片對一段溢流造成的阻力相對較小，綜合這兩方面來看，所設(shè)計螺旋導(dǎo)流葉片是一種性能更加優(yōu)異的導(dǎo)流裝置；而所設(shè)計的空心管結(jié)構(gòu)并未表現(xiàn)出在減小一段溢流阻力方面的優(yōu)越性，螺旋葉片相比于直葉片在減小對一段溢流阻力方面表現(xiàn)出一定的優(yōu)越性。在螺旋導(dǎo)流葉片阻力相對較小的情況下，通過改變一段旋流器結(jié)構(gòu)（增大錐角、縮小底流口等），實現(xiàn)一段底流出料量與不加導(dǎo)流葉片時基本一致、二段分級性能大幅度提升從而提升整個三產(chǎn)品旋流器系統(tǒng)的想法是完全可行的。 同時，CFD數(shù)值模擬技術(shù)被用來對“入料渦流強度對旋流器分級性能的影響”和“不同導(dǎo)流葉片的消渦效果”進行數(shù)值模擬，發(fā)現(xiàn)：分級旋流器流場中的切向速度顯著降低和流場的不穩(wěn)定性是渦流入料導(dǎo)致分級旋流器分級性能下降的根本原因；而由于導(dǎo)流葉片阻力導(dǎo)致的一段旋流器流場中的下降流加強是其導(dǎo)致一段底流出料量加大的根本原因。數(shù)值模擬的結(jié)果很好的解釋和印證了試驗現(xiàn)象。
[Abstract]:As a kind of cyclone separation equipment in coal, chemical industry, environmental protection and other industrial fields have a wide range of applications, because it has the advantages of simple structure, easy operation, low occupancy area, reliable and durable, zero rotating parts and the advantages of easy maintenance. Sometimes, the needs of industrial production or to achieve certain goals, needs to be more than the hydrocyclone used in combination, such as series, parallel and so on. If you need a product of overflow cyclone sorting or grading will need to continue, in the hydrocyclone overflow outlet cyclone series corresponding, to continue sorting or grading, the two section cyclone system is often referred to as the three product cyclone overflow direct system a fundamental problem. There are three product cyclone overflow system is directly connected to a cyclone overflow is often high rotational, and this will be on the two stage separation / vortex cyclone classification The performance impact of few scholars involved. The three product cyclone overflow direct application in many existing operating units, research on the eddy current feeding on hydrocyclone separation / classification performance and how to eliminate the influence of a vortex cyclone overflow, overflow straight even improve the three product cyclone system overall process performance it is very necessary.
In this study, using a specific device (the actual entrance for different specifications, underflow sealed two separation hydrocyclone) produced two different overflow swirl intensity, feeding them as classifying cyclone, together with DC feed, there are three different swirl intensity (feed flow rate at the same) grading efficiency of cyclone conditions. By comparing the grading curve showed that the classification performance of classifying cyclone decreases with increasing feeding swirl intensity.
After feeding to eddy harm to the classification performance of the cyclone, a connecting pipe cross blade device is installed between a separation hydrocyclone and hydrocyclone in the two step, in order to remove a vortex of flooding, improve the efficiency of two stage classification and improve the overall process performance of the three product cyclone system. The test results show that the cross blade device can effectively eliminate the eddy overflow, improve the efficiency of two stage classification, however, it will also cause some resistance to a section of the overflow, underflow discharge leads to a volume increase.
The leaves on a larger cross device overflow resistance problems, we designed two kinds of spiral guide vane device of the utility model, a hollow cross blade, a spiral guide vane. The experimental results show that the two step cyclone effect, in the premise of coarse efficiency is close to 100%. Installation of spiral guide vane underflow fine entrainment phenomenon is lighter, at the same time, resulting in a spiral guide vane of overflow resistance is relatively small, the combination of these two aspects, the design of the spiral guide vane is the guiding device of a more excellent performance; and the design of the hollow tube structure did not show superiority in reducing a relief the resistance of the spiral blade compared to the straight blade in a decrease of the overflow resistance showed certain advantages. The spiral guide vane resistance is relatively small, the A variable structure (the hydrocyclone cone angle increases, reduce the underflow etc.), to achieve a bottom discharge amount is consistent with and without guide vanes, two segment classification performance is greatly improved so as to enhance the entire three product cyclone system idea is feasible.
At the same time, CFD numerical simulation technology is used to influence feeding swirl intensity on the classification performance of the cyclone and different guide vane vortex suppression effect was simulated, found that the flow field of classifying cyclone in the tangential velocity decreased and flow instability is the root cause of eddy current feed grade flow decrease for the performance of the classifier; and because of the decline of a guide vane cyclone flow field resistance led to the flow of strengthening is the lead to a fundamental reason to increase the amount of material flows out from the bottom. The numerical simulation results well explain and confirm the experimental phenomena.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD94;TD455

【參考文獻】

相關(guān)期刊論文 前10條

1 蔡振華;張宗莉;;我國選煤技術(shù)的展望[J];廣東科技;2011年24期

2 馬藝;王振波;金有海;;導(dǎo)葉式液液旋流器內(nèi)油相濃度分布數(shù)值模擬[J];化工學(xué)報;2011年02期

3 汪顯東;陳曄;;溢流管深度對水力旋流器分離效率的影響[J];金屬礦山;2011年05期

4 趙樹彥;;無壓給料三產(chǎn)品重介質(zhì)旋流器分選工藝和設(shè)備[J];煤炭加工與綜合利用;2006年05期

5 楊勝林;王朝陽;李春生;張樹森;楊瑞峰;;三產(chǎn)品重介質(zhì)旋流器應(yīng)用的探討[J];煤炭加工與綜合利用;2008年04期

6 吳式瑜;;中國選煤發(fā)展三十年[J];煤炭加工與綜合利用;2009年01期

7 劉峰;王金生;;先排矸三產(chǎn)品重介質(zhì)旋流器流場的數(shù)值模擬[J];煤炭學(xué)報;2007年12期

8 劉峰;邵濤;羅時磊;徐延楓;;無壓給料三產(chǎn)品重介質(zhì)旋流器流場的數(shù)值模擬[J];煤炭學(xué)報;2009年08期

9 黃聰;汪華林;陳聰;劉金明;吳瑞豪;;微旋流器組并聯(lián)配置性能對比:U-U型與Z-Z型[J];化工學(xué)報;2013年02期

10 王劍剛;張艷紅;白兆圓;黃聰;汪華林;;進口尺寸對旋轉(zhuǎn)流場分離特征的影響[J];化工學(xué)報;2014年01期

本文編號：1560632