攪拌槽內(nèi)部流場及固液懸浮特性的數(shù)值模擬分析
[Abstract]:Because of its advantages of flexible operation, good mixing effect, large contact area and strong applicability, mixing equipment is widely used in mechanical, chemical and other process industries, and is one of the most widely used chemical unit operations. Among them, the study of flow field and solid-liquid suspension characteristics in stirred tank is of great significance to industrial production, so it is one of the hot topics of domestic and foreign scholars. In recent years, the scale of stirred reactor has gradually become larger and the problem of uneven mixing between phases has become more and more obvious, and the current mechanical process is gradually turning to "green", energy-saving direction, and more emphasis on product recovery and product quality. Therefore, reasonable design and selection of mixing equipment is particularly important. But today, the selection and design of mixing equipment is still mainly dependent on small-scale experimental results and semi-theoretical and semi-empirical methods. Due to the limitation of technology and conditions, the detailed distribution of the flow field in the stirred tank can not be clearly understood in the design, and the detailed distribution of the flow field in the stirred tank is not well understood, and the experimental simulation period is long, the deviation and the cost are large. The new cross-disciplinary computational fluid dynamics (CFD) technology provides a new way of thinking and a new method to solve the above problems. Its technical advantages make the numerical simulation of the flow field and solid-liquid suspension characteristics in the stirred tank become one of the hot spots in the agitation field. However, the numerical simulation of the flow field and solid-liquid suspension characteristics in the stirred tank has not yet formed a more perfect theory. Based on computational fluid dynamics (CFD) technique, the flow field and solid liquid suspension characteristics in stirred tank are numerically simulated by means of multiple reference system method and standard 魏-蔚 turbulence model. The stirring speed and the bottom clearance of the impeller are studied and analyzed. The influence of factors such as solid particle concentration on flow field distribution, concentration distribution of solid particles, critical suspension speed and power consumption. The results show that the clearance of blade bottom has a great influence on the flow field and the solid liquid suspension state in the stirred tank. The low bottom gap is favorable to the suspension of solid particles in the tank, but when the gap is too low, the power consumption is relatively large. The lower the clearance from the bottom of the blade is, the easier it is to appear the liquid-clearing layer. Increasing the stirring speed can improve the stirring effect, but considering the influence of the stirring power and durability, it is not better to increase the stirring speed, so it is necessary to determine the appropriate stirring speed synthetically. The impeller bottom clearance, solid particle diameter and solid volume concentration have effects on the stirring power. Under the same conditions, the power consumption varies with the bottom clearance of the propeller. Under the three conditions of C / T / 4 / T / 5 and T / 6, The power consumption is minimum at C=T/ 4; Under the same conditions, the power consumption increases with the increase of solid particle diameter, and increases with the decrease of solid volume concentration at the same stirring speed.
【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)】:TQ051.72
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