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轻介质旋流沉降分离过程的研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/9/29 11:56:02  

摘要:随着经济的快速发展,塑料的使用有增无减导致大量塑料废弃物的产生,因此研究废旧塑料有效分离符合环境保护和经济可持续发展的需求。鉴于国内外关于轻介质旋流反向沉降分离技术的文献研究报道甚少,但现实存在分离密度比水小的固体混合物需求。因此本文以废旧塑料分离再回收为背景,研究两种密度比水小的固固混合物的轻介质旋流逆向沉降分离过程,这对固体废弃物如废旧塑料的资源化处理和丰富双固相旋流反向沉降分离理论具有重要的意义。

本文通过理论分析、试验研究和CFD数值模拟研究相结合的方法研究轻介质旋流沉降分离过程。得到主要结果如下。

随着进料流量的增加,牛顿效率先逐渐增大且在进料流量达到一定值出现减小,牛顿效率最大值对应的进料流量为3.6m3/h。随着底流分率的增加,牛顿效率首先增大随后减小,牛顿效率最大值对应的底流分率为0.4。

随着轻重相颗粒体积比的增大,试验和模拟的牛顿效率都先增大后减小,在轻重相颗粒体积比约为2.0时达到最大值,进料中轻分散相浓度越大,所需的溢流口直径就要越大。

随着矩形入口宽高比的减小,牛顿效率先逐渐增大随后减小,在矩形入口宽高比为0.4时达到最大值。当溢流管插入深度增加时,牛顿效率先减小随后逐渐增大,在插入深度为47mm处达到最大值。变锥角时,定柱段长度情况下,随着锥角增大,牛顿效率呈先增大后减小,在锥角为10°时牛顿效率最高;定长径比情况下,当锥角从10°增至12°时,牛顿效率增大,随着锥角继续增加,牛顿效率逐渐减小,锥角12°时牛顿效率达到最大值。对于本研究一定粒度下的HDPE和PP塑料颗粒,当筒体直径减小时,压力降减小,牛顿效率首先逐渐增大,当筒体直径减小至58mm时,牛顿效率出现减小。

With the rapid development of the economy,the use of plastics has increased, resulting in a large amount of plastic waste.Therefore, the separation of waste plastics is in line with the need to protectthe environment and sustainable economic development. In view of the lack ofliteratures and reports on the reverse sedimentation separation technology oflight medium hydrocyclone at home and abroad, but there is a real need for theseparation of solid mixture with its density lower than that of water.Therefore, this paper takes the separation and recycling of waste plastics asthe background, the light medium hydrocyclone reverse sedimentation separationprocess of two kinds of solid mixture with its density lower than that of waterwas studied, which is of great significance for the resource treatment of solidwaste such as waste plastics and enriching the separation theory of reversesettlement of double solid-phase hydrocyclone.

In this paper, theoretical analysis,experimental research and CFD numerical simulation research were combined tostudy the hydrocyclone sedimentation separation process of light medium. Themain results are as follows.

As the feed flow rate increased, Newtonefficiency first increased gradually and decreased when the feed flow ratereached a certain value. The Newton efficiency maximum corresponds to the feedflow rate of 3.6m3/h. As the underflow fraction increased, the Newtonefficiency first increased and then decreased, reaching the maximum at theunderflow fraction of 0.4.

With the increase of the volume ratio oflight and heavy phase particles, both the experimental and simulated Newton efficiencyfirst increased and then decreased, reaching the maximum value when the volumeratio of light and heavy phase particle was about 2.0. The larger the lightdispersed phase concentration in the feed, the larger the diameter of theoverflow port required.

As the width-height ratio of rectangularentrance decreased, Newton efficiency increased first and then decreased,reaching the maximum at the width-height ratio of rectangular entrance of 0.4.As the depth of the overflow tube increased, Newton efficiency decreased firstand then increased, reaching the maximum at the insertion depth of 47mm. Whenthe cone angle was changed, the length of the column segment was constant, andthe Newton efficiency increased first and then decreased with the increase ofcone angle. The Newton efficiency was highest when the cone angle was 10°; Whenthe length-to-diameter ratio was constant, Newton efficiency increased when thecone angle increased from 10° to 12°. As the cone angle continued to increase,the Newton efficiency decreased gradually, reaching the maximum at the coneangle of 12°. For the HDPE and PP plastic granules at a certain particle sizein this study, when the diameter of the cylinder decreased, the pressure dropreduced, and the Newton efficiency gradually increased first. When the diameterof the cylinder reduced to 58mm, the Newton efficiency decreased.

关键词:密度分离;轻介质;废旧塑料;旋流分离器;计算流体力学;多相流

density separation; light medium; wasteplastics; hydrocyclone; CFD; multiphase flow

上一篇:SCR废催化剂中TiO2和SiO2的重介质旋流分离过程的研究     下一篇:剪切稀化流体内单气泡上浮特性的研究
 
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