本文選題：浮選機(jī)　切入點(diǎn)：射流　出處：《安徽理工大學(xué)》2015年碩士論文

【摘要】：基于將對(duì)浮選影響較大的噴射、渦流和攪拌三種流體特征有機(jī)結(jié)合,通過對(duì)機(jī)械攪拌式浮選機(jī)和噴射式浮選機(jī)結(jié)構(gòu)特征的分析,提出了一種新型浮選攪拌裝置——復(fù)合式浮選攪拌裝置。復(fù)合式浮選攪拌裝置以一定壓力的礦漿通過自吸式噴射器吸入空氣的同時(shí)經(jīng)噴射器聚合噴射出高速礦漿沖擊葉輪,從而驅(qū)動(dòng)葉輪攪拌來達(dá)到攪拌礦漿和切割氣泡的作用。充氣量是評(píng)價(jià)浮選機(jī)性能的重要指標(biāo),而復(fù)合式浮選攪拌機(jī)構(gòu)的作用原理是復(fù)雜的,其既要保證抽吸到大量的空氣,又要保證射流具有足夠的沖擊力從而驅(qū)動(dòng)葉輪攪拌。因此研究復(fù)合式浮選攪拌裝置的吸氣方式及在某種吸氣方式下的吸氣性能是復(fù)合式浮選攪拌裝置研發(fā)的一個(gè)重要方面,對(duì)今后的深入研究具有借鑒意義。 本文首先利用流場(chǎng)模擬軟件對(duì)噴射器結(jié)構(gòu)特征進(jìn)行仿真,尋找吸氣性能最優(yōu)時(shí)的噴射器結(jié)構(gòu)參數(shù),然后加工制作出噴射器實(shí)物模型并對(duì)其進(jìn)行一系列的試驗(yàn)研究,確定噴射器的可行性,為復(fù)合式浮選攪拌裝置提供理論基礎(chǔ)。結(jié)果表明： 1、對(duì)于中心進(jìn)氣——周邊進(jìn)料噴射器,吸氣管在噴射器所處位置對(duì)吸氣性能具有重大影響。吸氣管從噴射器圓錐部分向圓柱部分移動(dòng)時(shí),吸氣量先迅速增大,在噴射器圓錐圓柱結(jié)合處時(shí),吸氣量達(dá)到最大,吸氣管在圓柱段移動(dòng)時(shí),吸氣量逐漸緩慢減小。圓柱段長(zhǎng)度l在8-16mm之間時(shí),吸氣性能較好。噴射器收縮角a=15。時(shí),對(duì)噴射器是有利的。 2、對(duì)中心進(jìn)料——周邊進(jìn)氣噴射器,喉嘴距對(duì)噴射器吸氣性能具有最主要影響。喉嘴距過大過小都會(huì)影響噴射器的吸氣性能,當(dāng)喉嘴距為15mm時(shí),噴射器吸氣性能最佳。在最佳喉嘴距時(shí),喉管長(zhǎng)度對(duì)吸氣性能影響不大。存在一個(gè)最佳喉管直徑使吸氣性能最佳。 3、對(duì)淹沒射流來說,收縮角對(duì)射流區(qū)域軸線速度有一定影響,α=15。的軸線速度最佳,隨角度增大,軸線速度有下降趨勢(shì)。圓柱段長(zhǎng)度對(duì)軸線速度的影響不顯著。 4、對(duì)兩種噴射器的試驗(yàn)研究表明,試驗(yàn)數(shù)據(jù)結(jié)果跟模擬相比總體偏小,但數(shù)據(jù)所表現(xiàn)出的趨勢(shì)和模擬相類似,證明了設(shè)計(jì)的噴射器的可行性,在具體方面存在更大的優(yōu)化可能。
[Abstract]:Based on the organic combination of jet, eddy current and agitation characteristics, the structural characteristics of mechanical agitated flotation machine and jet flotation machine are analyzed. A new type of flotation agitator, compound flotation agitator, is proposed. The compound flotation agitator uses a certain pressure slurry to inhale air through a self-priming ejector, and at the same time ejects a high-speed pulp impeller by jet polymerization. Therefore, impeller stirring is driven to achieve the functions of stirring pulp and cutting bubbles. The aeration rate is an important index to evaluate the performance of flotation machine, and the working principle of compound flotation agitating mechanism is complex, which should ensure the suction of a large amount of air. It is also necessary to ensure that the jet has sufficient impact force to drive the impeller agitation.Therefore, it is an important aspect of the research and development of the compound flotation agitator to study the suction mode of the compound flotation agitator and its inspiratory performance under a certain suction mode. It can be used for reference for further study. In this paper, the structural characteristics of the ejector are simulated by using the flow field simulation software, and the structural parameters of the ejector are found when the inspiratory performance is optimal. Then the physical model of the ejector is made and a series of experimental studies are carried out. The feasibility of the ejector is determined and the theoretical basis is provided for the compound flotation agitator. The results show that:. 1. For the central intake-peripheral feed injector, the location of the suction tube in the injector has a significant effect on the suction performance. When the suction pipe moves from the cone part of the ejector to the cylindrical part, the suction capacity increases rapidly. At the conical cylinder joint of the injector, the inspiratory capacity reaches the maximum, and the inspiratory capacity decreases slowly when the tube moves in the cylinder segment. When the cylinder length l is between 8-16mm, the inspiratory performance is better. It's good for the ejector. 2. For the central feed-peripheral air injector, the throat distance has the most important effect on the suction performance of the injector. The suction performance of the ejector is affected by the large or small throat nozzle distance, when the throat nozzle distance is 15mm, The suction performance of the injector is the best. The length of the pipe has little effect on the suction performance at the optimum throat distance. There is an optimum diameter of the throat to make the suction performance the best. 3. For submerged jet, the contraction angle has certain influence on the velocity of axis line in the jet region, and the axis velocity of 偽 _ (15) is the best. With the increase of angle, the velocity of axis line decreases, but the length of cylinder section has no significant effect on the velocity of axis line. 4. The experimental results of the two kinds of ejectors show that the experimental data are smaller than those of the simulation, but the trend of the data is similar to that of the simulation, which proves the feasibility of the designed ejector and the possibility of optimization.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD456

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李燕;魏宗信;趙鑫;;射流器空氣—水混合ANSYS模擬及喉管優(yōu)化[J];長(zhǎng)春理工大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年04期

2 吳大為,馬連清;XPM系列噴射式浮選機(jī)[J];華北礦業(yè)高等�？茖W(xué)校學(xué)報(bào);1999年01期

3 陳維平;江帆;李元元;李小強(qiáng);;射流曝氣的氣液兩相流的數(shù)值模擬[J];環(huán)境污染治理技術(shù)與設(shè)備;2006年03期

4 牟聯(lián)勝;;高效射流浮選機(jī)在某鉛鋅礦浮選生產(chǎn)中的應(yīng)用[J];黃金;2010年03期

5 何廷樹，，陳炳辰;細(xì)粒浮選機(jī)的設(shè)計(jì)準(zhǔn)則[J];金屬礦山;1996年05期

6 X·奧拉瓦伊年 ,張興仁 ,肖力子;芬蘭奧托昆普公司浮選機(jī)的研究與開發(fā)[J];國(guó)外金屬礦選礦;2002年04期

7 黃思;羅力;楊國(guó)蟒;;液環(huán)泵噴射器三維流場(chǎng)數(shù)值模擬分析[J];機(jī)械設(shè)計(jì)與制造;2012年05期

8 趙昱東;;浮選機(jī)的應(yīng)用與發(fā)展[J];礦山機(jī)械;2007年07期

9 趙昱東;;浮選設(shè)備的新進(jìn)展[J];礦山機(jī)械;2010年16期

10 牟聯(lián)勝;劉吉彪;;高效射流浮選機(jī)在赤褐鐵礦反浮選生產(chǎn)中的應(yīng)用[J];礦山機(jī)械;2011年08期

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