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Geometric properties of chemical filler
作者:Steven 发布于:2011/5/13 14:15:52 点击量:

The geometric characteristics of chemical packing data including the specific surface area, porosity, filling factor, is the basic parameter to evaluate the properties of the filler.

The specific surface area per unit volume of filler filler surface area known as the specific surface area, a said, the unit is m2/m3. The specific surface area of packing is larger, the gas-liquid mass transfer area provide more. Therefore, the specific surface area is an important index to evaluate the performance of the filler.

Void void volume in the packing unit called the void ratio, expressed in E, the unit is m3/m3, or in%. Void chemical filler rate is higher, the ability of gas through the larger and lower pressure. Therefore, void ratio is an important index to evaluate the performance of the filler.

Ratio of chemical packing factor filler surface area and porosity of three parties, namely a/e 3, called the packing factor, denoted F, its unit for 1/m. Packing factor into the stem packing factor and wet packing factor, chemical filler is not liquid wetting when a/e3 called the stem packing factor, which reflect the geometric characteristic packing; packing is liquid wetting, surface covered with a layer of film, a and E are changed, the a/e 3 is called wet packing factor, which represents the hydrodynamic performance of the packing, the smaller value of F indicates that the flow resistance is small.

Chemical packing performance usually according to efficiency, flux and pressure drop of three elements to measure. Under the same operating conditions, the specific surface area of packing more big, gas-liquid distribution is more uniform, the better surface wettability, the mass transfer efficiency is high; packing void ratio is greater, more open, the flux is large, the pressure drop is low. The performance of the fuzzy mathematics method to nine kinds of commonly used fillers were evaluated conclusion. The comprehensive performance of corrugated wire gauze packing Raschig ring best, worst.

(source: http://bbs.hcbbs.com/)

 

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