【摘要】：振動流化床干燥器作為一種干燥設備對濕態(tài)散狀物料的干燥優(yōu)點很多,主要表現(xiàn)為床層物料在激振力作用下實現(xiàn)拋擲,可明顯降低進口熱空氣用量,而且振動作用可改變顆粒在床層上的分布,避免了顆粒結(jié)塊,并可改善顆粒空隙度。但是振動流化床內(nèi)部的流動和傳熱過程復雜,目前關于其流動和傳熱的理論研究并不多見。論文總結(jié)了目前國內(nèi)振動流化床干燥設備的研究現(xiàn)狀,利用Solidworks和PHOENICS軟件建立了振動流化床微觀傳熱過程的計算模型,然后用PHOENICS軟件對微觀模型進行了較詳細的數(shù)值模擬。研究發(fā)現(xiàn),在計算條件允許范圍內(nèi)床層厚度越大、進口風速越低用于干燥的氣體熱量利用率增加,進口氣流溫度升高熱風流過顆粒群后溫度降低越明顯,傳熱效率隨粒徑減小稍有增大,篩網(wǎng)表面顆粒排布密度、排布形式等對微觀傳熱也會產(chǎn)生不同程度的影響。在瞬態(tài)條件下通過編制MOF文件,利用運動物體方法實現(xiàn)了篩網(wǎng)的振動運動,對近篩網(wǎng)流動進行了動態(tài)分析,得到了動態(tài)的流場、壓力場分布,由瞬態(tài)的計算可知由于篩網(wǎng)的振動,篩網(wǎng)附近出現(xiàn)反流,流動阻力系數(shù)發(fā)生變化,速度流場變得復雜,由于算法和計算機硬件制約,振動對傳熱的作用需進一步研究。論文研究結(jié)果對提高振動流化床干燥機的傳熱性能有一定的參考價值。
[Abstract]:As a kind of drying equipment, the vibratory fluidized bed dryer has many advantages in drying wet dispersed materials, which mainly shows that the bed material is thrown under the action of exciting force, and the amount of imported hot air can be reduced obviously. The vibration can change the distribution of particles on the bed, avoid the agglomeration of particles, and improve the porosity of particles. However, the flow and heat transfer processes in vibratory fluidized beds are complex, and the theoretical research on the flow and heat transfer is rare. In this paper, the present research situation of vibratory fluidized bed drying equipment in China is summarized. The calculation model of micro heat transfer process of vibratory fluidized bed is established by using Solidworks and PHOENICS software, and then the detailed numerical simulation of the micro model is carried out by PHOENICS software. It is found that the larger the bed thickness is, the lower the inlet wind speed is, and the lower the heat efficiency of the inlet air is, the more obvious the temperature decreases after the inlet air temperature rises and the hot air flows through the particle group. The heat transfer efficiency increases slightly with the decrease of particle size, and the distribution density and distribution form of the particles on the surface of the screen also have different effects on the microcosmic heat transfer. Under the transient condition, the vibration motion of the sieve mesh is realized by the method of moving object by compiling the MOF file. The dynamic analysis of the flow near the screen is carried out, and the distribution of the dynamic flow field and pressure field is obtained. From the transient calculation, it can be seen that because of the vibration of the screen mesh, the reverse flow around the screen, the change of the flow resistance coefficient and the complexity of the velocity flow field, the effect of vibration on heat transfer needs to be further studied because of the restriction of algorithm and computer hardware. The results of this paper have some reference value for improving the heat transfer performance of vibratory fluidized bed dryer.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB4

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本文編號：2152812