本文關(guān)鍵詞： 強化重力分選機 來復(fù)圈 水力堰 反沖水 細顆粒　出處：《煤炭學(xué)報》2016年05期 　論文類型：期刊論文

【摘要】：采用數(shù)值模擬與試驗驗證相結(jié)合的方法,對離心分選機內(nèi)的流場分布與顆粒的分離規(guī)律進行研究,并對來復(fù)圈的結(jié)構(gòu)及反沖水孔的排布進行優(yōu)化,結(jié)果表明:位于分選區(qū)和分層區(qū)交界處存在的動態(tài)水力堰效應(yīng)具有強化分選的作用;來復(fù)圈的結(jié)構(gòu)對分選的影響主要表現(xiàn)在來復(fù)圈的截面形狀以及反沖水孔的分布。通過模擬研究了來復(fù)圈內(nèi)顆粒堆積規(guī)律,并設(shè)計出雙弧形邊壁。來復(fù)圈內(nèi)流膜按照湍流強度可分為3層結(jié)構(gòu),從上到下依次是弱紊流層、擾動過渡層和射流控制層。反沖水孔數(shù)量較多時,射流控制層形成的偽彈性波短而頻,適合分選較細顆粒;反沖水孔較少時,偽彈性波長而疏,利于較粗顆粒分選。
[Abstract]:The flow field distribution and particle separation law in centrifugal separator were studied by the method of numerical simulation and experimental verification, and the structure of the loop and the layout of the recoil water hole were optimized. The results show that the dynamic hydraulic Weir effect at the junction of the sub-district and the stratified area has the effect of strengthening separation. The influence of the structure of the loop on the separation is mainly reflected in the shape of the section of the ring and the distribution of the recoil water hole. The inner flow film can be divided into three layers according to the turbulence intensity, from top to bottom are weak turbulent layer, disturbance transition layer and jet control layer. The pseudoelastic wave formed by jet control layer is short and frequency, which is suitable for sorting fine particles. When the recoil water hole is less, the pseudo-elastic wavelength is sparse, which is favorable for the separation of coarse particles.
【作者單位】： 中國礦業(yè)大學(xué)化工學(xué)院;中國礦業(yè)大學(xué)煤炭加工與高效潔凈利用教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51374206);國家自然科學(xué)基金創(chuàng)新群體資助項目(51221462)
【分類號】：TD455
【正文快照】： 重力分選(重選)由于生產(chǎn)成本低、環(huán)境污染小而被廣泛應(yīng)用于礦物的分選。隨著兩相流理論和機械振動學(xué)等學(xué)科的發(fā)展,重選已經(jīng)從傳統(tǒng)的重力與流體作用力為主的分選模式發(fā)展為重力與離心力、流體作用力、機械振動力等相結(jié)合的復(fù)合力場分選新方法[1]。借助強化離心力場的引入可有效

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1 王純;劉祚時;李凡;;尼爾森選礦機反沖水壓對精礦回收率的影響分析[J];現(xiàn)代礦業(yè);2013年07期

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