本文選題：三產(chǎn)品旋流分級篩 + FLUENT�。� 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：三產(chǎn)品旋流分級篩作為一種新型高效的細(xì)粒煤分級設(shè)備,具有十分重要的研究價(jià)值和應(yīng)用前景。本文以三產(chǎn)品旋流分級篩內(nèi)部液相流場作為研究內(nèi)容,重點(diǎn)分析透篩過程對內(nèi)部液相流場的影響,為后續(xù)研究提供一定的幫助。本文首先對三產(chǎn)品旋流分級篩的內(nèi)部流場進(jìn)行理論分析,目的是為了FLUENT仿真模擬選擇合適的計(jì)算模型和邊界條件。經(jīng)過Solidworks建立流場模型、ICEM前處理、FLUENT仿真模擬,得到三產(chǎn)品旋流分級篩和水力分級旋流器內(nèi)部的流場信息。本文利用物理模型做出的試驗(yàn)結(jié)果和流場模型做出的模擬結(jié)果進(jìn)行三個(gè)產(chǎn)品的流量對比,從而驗(yàn)證流場模型所選擇的RSM+VOF計(jì)算模型和邊界條件的正確性。通過對比器壁開有篩網(wǎng)的三產(chǎn)品旋流分級篩和器壁無網(wǎng)的水力分級旋流器內(nèi)部的流場信息發(fā)現(xiàn),三產(chǎn)品旋流分級篩內(nèi)部流場要比水力分級旋流器需要更長的時(shí)間來穩(wěn)定,篩網(wǎng)透篩過程的存在導(dǎo)致在同一入料速度10m/s的條件下,三產(chǎn)品旋流分級篩的入口靜壓比水力分級旋流器的低了50.6%,內(nèi)部流場的整體靜壓也比水力分級旋流器中的靜壓大幅降低,溢流口壓力降由水力分級旋流器的48.6kpa降為了24.1kpa,三產(chǎn)品旋流分級篩錐段的最大切向速度已經(jīng)不到1m/s,基本達(dá)不到離心分級的效果,錐段軸向零速包絡(luò)面的范圍比水力分級旋流器的小很多,即三產(chǎn)品旋流分級篩中的離心分級粒度比水力分級旋流器中的小。最后,通過改變篩網(wǎng)的高度來研究不同透篩過程強(qiáng)度下對內(nèi)部流場的影響,分別選取了高徑比為2.0和1.5條件下的三產(chǎn)品旋流分級篩模型進(jìn)行模擬,得出了高徑比為1.5時(shí)的三產(chǎn)品旋流分級篩內(nèi)沿半徑的靜壓梯度遠(yuǎn)高于高徑比為2.0和2.5的靜壓梯度,非常接近水力分級旋流器中的靜壓梯度;其次,高徑比為1.5的三產(chǎn)品旋流分級篩錐段內(nèi)的最大切向速度是高徑比2.0和2.5的3倍以上,數(shù)值上可以達(dá)到2.5-3.5m/s,而離心力是水力分級旋流器的0.575倍,在具有篩網(wǎng)存在的條件下,還能保證錐段的離心力場,從而使得三產(chǎn)品旋流分級篩的篩分分級和離心分級都得到了保障。本文的研究成果為進(jìn)一步研究三產(chǎn)品旋流分級篩內(nèi)部流場提供了一個(gè)新的視角,為三產(chǎn)品旋流分級篩結(jié)構(gòu)優(yōu)化和工藝調(diào)整提供理論指導(dǎo)。
[Abstract]:As a new type of high-efficient fine coal classification equipment, the three-product swirl classifier has very important research value and application prospect. In this paper, the internal liquid flow field of the three-product swirl sieve is taken as the research content, and the influence of the permeation process on the internal liquid flow field is analyzed, which provides some help for the further study. In this paper, the internal flow field of the three-product swirl sieve is theoretically analyzed in order to select the appropriate calculation model and boundary conditions for the FLUENT simulation. The flow field information of the three-product swirl sieve and hydrocyclone was obtained by simulation and simulation of Solidworks flow field model. In this paper, the experimental results of the physical model and the simulation results of the flow field model are used to compare the flow rate of the three products, so as to verify the correctness of the RSM VOF calculation model and the boundary conditions selected by the flow field model. By comparing the flow field information inside the three-product swirl classifier with sieve opening and the hydrocyclone with no screen on the wall, it is found that the internal flow field of the three-product swirl classifier needs longer time to be stable than that of the hydrocyclone. Under the condition of the same feed speed 10m/s, the inlet static pressure of the three-product swirl classifier is 50.6 lower than that of the hydraulic classifier, and the whole static pressure of the internal flow field is significantly lower than the hydrostatic pressure in the hydrocyclone. The pressure drop of the overflow port is reduced from 48.6kpa of the hydrocyclone to 24.1 kpa.The maximum tangential velocity of the cone section of the three-product swirl classifier is less than 1m / s, which can hardly achieve the effect of centrifugal classification. The range of the axial zero velocity envelope of the cone is much smaller than that of the hydrocyclone, that is, the centrifugal particle size in the three-product cyclone is smaller than that in the hydrocyclone. Finally, by changing the height of sieve mesh to study the influence of different intensity of permeation process on the internal flow field, the three-product swirl classifying sieve model with the ratio of height to diameter 2.0 and 1.5 is selected to simulate, respectively. The static pressure gradient along the radius of the three-product swirl classifier is much higher than the hydrostatic gradient with the aspect ratio of 2.0 and 2.5, which is very close to the hydrostatic gradient in the hydrocyclone. The maximum tangential velocity in the cone section of the three-product swirl classifier with aspect ratio of 1.5 is more than three times that of the ratio of height to diameter 2.0 and 2.5, and the numerical value can reach 2.5-3.5 m / s, while the centrifugal force is 0.575 times that of the hydrocyclone. The centrifugal force field of the cone section can also be guaranteed, so that the sieve and centrifugal classification of the three-product swirl sieve can be guaranteed. The research results in this paper provide a new angle of view for further study on the internal flow field of three-product swirl classifier, and provide theoretical guidance for the optimization of structure and process adjustment of three-product swirl classifier.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD452

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