本文選題：雙溢流管 + 煤泥旋流重選柱　； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：為了能夠改善煤泥旋流重選柱只出兩產(chǎn)品的局限性，同時(shí)提高精煤產(chǎn)率，采用在煤泥旋流重選柱內(nèi)部插入一根同心上溢流管，變原溢流管上出口結(jié)構(gòu)為切向側(cè)出口結(jié)構(gòu)，形成新的粗煤泥分選旋流器—雙溢流管煤泥旋流重選柱。對(duì)雙溢流管煤泥旋流重選柱的操作參數(shù)和溢流結(jié)構(gòu)進(jìn)行了優(yōu)化研究，并進(jìn)行了某一結(jié)構(gòu)下的粗煤泥分選效果評(píng)定。運(yùn)用計(jì)算流體動(dòng)力學(xué)軟件Fluent對(duì)不同上溢流管內(nèi)徑的插入深度下的旋流器流場進(jìn)行了數(shù)值模擬，模擬結(jié)果較好的驗(yàn)證了試驗(yàn)結(jié)果。 在不同的入料壓力下進(jìn)行了粗煤泥分選試驗(yàn)，將不同壓力下得到的三產(chǎn)品按粒級(jí)計(jì)算分配率并化驗(yàn)灰分。試驗(yàn)結(jié)果表明溢流和側(cè)溢流產(chǎn)品灰分會(huì)隨入料壓力的增加先減少后增加，過大的入料壓力會(huì)導(dǎo)致物料中粗粒級(jí)磨損嚴(yán)重。 在不同的側(cè)溢流進(jìn)料管長度下進(jìn)行了粗煤泥分選試驗(yàn)，將不同側(cè)溢流進(jìn)料管長度下得到的三產(chǎn)品按粒級(jí)計(jì)算分配率并化驗(yàn)灰分。試驗(yàn)結(jié)果表明增加側(cè)溢流進(jìn)料管長度會(huì)提高三產(chǎn)品的灰分，為保證溢流、側(cè)溢流和底流的灰分都達(dá)到比較滿意的效果，保持側(cè)溢流進(jìn)料管長度在190mm最合適。 在不同的上溢流管插入深度和內(nèi)徑下進(jìn)行了粗煤泥分選試驗(yàn)，將得到的三產(chǎn)品按粒級(jí)計(jì)算分配率并化驗(yàn)灰分。試驗(yàn)結(jié)果表明隨著上溢流管插入深度的增加，各產(chǎn)品灰分先降低后增加，隨著上溢流管內(nèi)徑的增加，上溢流管的作用由分級(jí)為主逐步變?yōu)榉诌x加排細(xì)。其中內(nèi)徑的作用要大于插入深度，，且更具有規(guī)律性。 在不同的側(cè)溢流口結(jié)構(gòu)下進(jìn)行了粗煤泥分選試驗(yàn)，將不同側(cè)溢流口結(jié)構(gòu)下得到的三產(chǎn)品按粒級(jí)計(jì)算分配率并化驗(yàn)灰分。試驗(yàn)結(jié)果表明對(duì)側(cè)溢流口減壓會(huì)導(dǎo)致底流中更多的中低灰物料隨溢流或側(cè)溢流排出，使溢流灰分不合格。 進(jìn)行了三產(chǎn)品分選效果評(píng)定，試驗(yàn)結(jié)果如下：＞1mm粒級(jí)的分選密度為1.483g/cm3,可能偏差為0.103，不完善度為0.212；1-0.5mm粒級(jí)的分選密度為1.638g/cm3,可能偏差為0.222，不完善度為0.348；＞1mm粒級(jí)的分選密度為1.852g/cm3,可能偏差為0.278，不完善度為0.326。 運(yùn)用計(jì)算流體動(dòng)力學(xué)軟件Fluent對(duì)旋流器內(nèi)流場進(jìn)行了數(shù)值模擬，模擬結(jié)果表明上溢流管內(nèi)徑的改變會(huì)影響旋流器內(nèi)流場的各速度分布，其中對(duì)切向速度和軸向速度影響最為明顯，而這兩種速度是物料在徑向上的分層和軸向上的分離的重要原因；上溢流管插入深度的改變對(duì)旋流器流場的影響不及內(nèi)徑，且其變化規(guī)律并非單調(diào)，在L=65mm時(shí)軸向速度略有降低，這可能是為何在試驗(yàn)中底流各粒級(jí)分配率會(huì)突然降低的原因。
[Abstract]:In order to improve the limitation of only two products produced by slurry cyclone gravity separation column and increase the yield of clean coal, a concentric upper overflow pipe was inserted into the coal slurry swirl gravity separation column to change the outlet structure of the original overflow pipe to tangential side outlet structure. A new coarse slime separation cyclone-double overflow pipe slime cyclone was formed. The operation parameters and overflow structure of double overflow pipe slime cyclone gravity separation column were optimized and the separation effect of coarse coal slime was evaluated under a certain structure. The flow field of hydrocyclone with different insertion depth of upper overflow tube was simulated by using the computational fluid dynamics software Fluent. The simulation results verified the experimental results well. The coarse coal slime separation test was carried out under different feed pressure. The distribution rate and ash content of the three products obtained under different pressure were calculated according to particle level. The results show that the ash content of overflow and side overflow products decreases first and then increases with the increase of feed pressure. The coarse coal slime separation test was carried out at different length of side overflow feed pipe. The distribution rate of three products under different side overflow feed pipe length was calculated according to particle level and ash content was tested. The test results show that increasing the length of the side overflow feed pipe will increase the ash content of the three products. In order to ensure the overflow, the ash content of the side overflow and the bottom flow can reach satisfactory results, and the best way to keep the length of the side overflow feed pipe in 190mm is to ensure the overflow. The coarse coal slime separation test was carried out at different insertion depth and inner diameter of the upper overflow pipe. The distribution rate of the three products was calculated according to the particle level and the ash content was tested. The test results show that the ash content of each product decreases first and then increases with the increase of the insertion depth of the upper overflow pipe, and with the increase of the inner diameter of the upper overflow pipe, the function of the upper overflow pipe gradually changes from grading to sorting, adding and refining. The effect of the inner diameter is greater than the insertion depth, and it is more regular. The coarse coal slime separation test was carried out under different side overflow structure. The distribution rate and ash content of the three products obtained under different side overflow outlet structures were calculated according to particle level. The experimental results show that the decompression of the contralateral overflow outlet will lead to the discharge of more medium and low ash materials in the bottom flow with the overflow or the side overflow, which makes the ash content of the overflow unqualified. The evaluation of the separation effect of three products has been carried out. The results are as follows: the density of 1mm grain-grade is 1.483g / cm ~ (-3), the possible deviation is 0.103, the degree of imperfection is 0.212g / cm ~ (-3), the possible deviation is 0.222g / cm ~ (3), the imperfection is 0.348, the possible deviation is 0.278g / cm ~ (3), the imperfect degree is 0.326. The numerical simulation of the flow field in the hydrocyclone is carried out by using the computational fluid dynamics software Fluent. The results show that the change of the inner diameter of the upper overflow tube will affect the velocity distribution of the flow field in the cyclone, especially the tangential velocity and the axial velocity. These two kinds of velocities are the important reasons for the separation of the material in radial stratification and axial direction, the influence of the insertion depth of the upper overflow tube on the flow field of the hydrocyclone is less than that of the inner diameter, and the variation law is not monotonous, and the axial velocity decreases slightly at the time of L=65mm. This may be the reason why the distribution rate of the bottom flow decreased suddenly in the experiment.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD94

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