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Dust Cake Compression Research in Filter Process with Embedding Method

Author: ZhangChengFeng
Tutor: YaoQiang
School: Tsinghua University
Course: Power Engineering and Engineering Thermophysics
Keywords: Solidification Fine particles Porosity Granular layer compression
CLC: X701.2
Type: Master's thesis
Year: 2005
Downloads: 70
Quote: 4
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Abstract


With respirable particulate matter pollution problems are more and more attention, the environmental technology has also been developed faster. Baghouse as a clean and efficient way to get more attention, but there are still many questions filter dust removal mechanism, while the granular layer compression phenomenon is one of them. This article by the method of curing the internal structure of the particle layer in the filtration process of direct observation and analysis and basis to establish a semi-empirical model to simulate the dynamic process of the granular layer structure. The curing method is not destroyed under the premise of the internal structure of the particle layer, uses a resin-embedded samples of the particle layer and the liquid resin phase fusion, the layer of particles can be obtained after curing of the resin at a suitable temperature after solidification. After post treatment, it can be directly in the internal structure of the scanning electron microscope on the particle layer observation. In this paper, the analysis of the observed image obtained on the porosity of the curve with the thickness of the granular layer. And found that the internal porosity of the particle layer is substantially maintained at a steady value, while there is a slight fluctuations, and even produce cyclical changes. By filtration experiments, apparent transition phenomenon was observed in the continuous variation of the differential curve, and with a certain periodicity. It also reflects the internal structure of the particle layer in the filtration process will change, and also can be seen as proof of the particle layer compression. This cyclical change is not sudden, but the constant accumulation of tiny fluctuations, the transition period will change with the filtration process. Found after comparison of the curve of the pressure difference, the particle concentration and the particle layer deposition rate directly affects the height of the particle layer and the internal porosity, also will affect the changes in the pressure differential. The larger the particle concentration, the faster the deposition rate, the filtration pressure is greater. Changes in certain assumptions on the porosity of the granular layer stacking process, combined with the experimental data can be drawn on a semi-empirical model used to describe the dynamic changes in porosity within the granular layer. This model can explain the process of change of the porosity of the particle layer compression phenomenon can also be described, and then using the corrected empirical formula can be drawn to the dynamic changes of the filtration process the differential curve, including the phenomenon of hopping.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Smoke and dust
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