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이산화탄소(CO<sub>2</sub>) 가스에 의한 케이크 여과속도의 향상
임성삼,송연민,Yim, Sung Sam,Song, Yun Min 한국화학공학회 2006 Korean Chemical Engineering Research(HWAHAK KONGHA Vol. No.
압축성이 큰 케이크에 의한 여과에서는 압력의 증가가 여과속도를 거의 향상시키지 못한다. 이 경우 높은 압력은 여과매체 옆의 케이크 공간률을 급격히 감소시켜 dense skin(치밀층, 緻密層)을 형성하여 이 층이 물의 통과속도를 매우 느리게 하기 때문이다. 실제로 압축성이 큰 케이크의 여과에서 여과속도를 향상시키기 위한 특별한 방법이 없었다. 본 연구에서는 여과 대상액을 여과조작 전에 $CO_2$ 가스로 포화시켜 용액에 녹아 있던 $CO_2$ 가스가 압력이 급격히 변하는 치밀층에서 기체 상태로 변화하여 치밀층 내에 작은 공간을 확보하고, 그 공간이 물길을 형성하여 여과속도를 향상시 킬 수 있는 가능성에 대해 연구하였다. For the filtration of super compactible cake, the high filtration pressure can not improve filtration rate. As the high pressure, in this case, decreases the cake porosity adjacent to filter medium and thus forms 'dense skin' which decreases the rate of liquid flow in a great extent. Actually, there was no method to improve filtration rate for the filtration with super compactible cake. We propose the saturation of $CO_2$ gas into the suspension before the filtration operation for improving the filtration rate. The dissolved $CO_2$ gas transforms itself into gas phase in the dense skin through which the pressure changes dramatically. The gas secures its space inside the dense skin, and finally forms the flow passages which improve the filtration rate.
여과-투과에 대한 실험적 분석: 여과매체의 종류, 여과매체의 매수, 여과압력의 영향
임성삼 ( Sung Sam Yim ),송연민 ( Yun Min Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
The average specific cake resistance, the most important indicator for cake filtration and solid-liquid separation, is measured by filtration experiment. But the exact value is difficult to measure because of the other influences such as sedimentation during filtration. This study, a little more stable method named filtration-permeation is proposed for measuring average specific cake resistance. The filtration-permeation is composed of permeation of particle eliminated water through pre-formed cake by filtration. Using 1 wt% calcium carbonate suspension, the filtration-permeation experiments were performed for 8 kinds of filter media at the conditions of 0.5 atm and 0.2 atm, 1 and 3 sheets of filter media, At each specific condition, three to five times filtration-permeation were accomplished. As a result, stable permeation speed is measured. According to this experimental result, the characteristics of permeation and the effect of sedimentation are analyzed with Ruth`s equation. The one way analysis of variance (one way ANOVA) is applied to the average specific cake resistances of filtration and permeation obtained with the selected three kinds of filter media. The average specific cake resistances between 0.5 atm and 0.2 atm by filtration do not distinguished, but those by permeation is perfectly distinguished. The experimental results during permeation have a very narrow distribution than that measured during filtration. The analysis of filtration experiments, it was verified that the resistance of filter medium by traditional method is of no significance. Finally, the migration of small particles through the medium composed of fiber glass at low pressure was studied.
고액분리 통합이론에서 pd의 역할: 간섭침전, 케이크 여과, 압착에서 케이크 두께를 중심으로
임성삼 ( Sung Sam Yim ),송연민 ( Yun Min Song ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
To know the role of ``the solid compressive pressure to the first solid layer of a cake, pd`` in the ``unified theory on solid-liquid separation``, we analyzed extremely compressible cake formed with floc for the following three operations with our new concepts, First, the role of pd was studied in calculating the sediment thickness of floc, and in calculating the cake thickness in cake filtration performed with floc sediment. Second, we calculated the expression procedure using pd, Finally, the influence of pd on cake thickness in hindered sedimentation, and on the calculation of the procedure of hindered sedimentation pd was verified, Thus the possibility of application of ``unified theory on solid-liquid separation`` and the importance of pd was verified, Through these processes, new theoretical definitions of the cake filtration, expression and hindered sedimentation was established.
침전이 수반되는 케이크 여과 II: 새로운 분석과 케이크에 도입되는 현탁액의 고체 질량분율
임성삼 ( Sung Sam Yim ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.3
Filtration on horizontal filter medium facing upward is accompanied by sedimentation. When sedimentation phenomenon is not considered, the average specific cake resistance by filtration could be in error more than two times. In the previous paper on this subject, it was insisted that the solid mass fraction of suspension changes in filtration period by sedimentation. But we could not find out the degree of change. At the first half of this paper, the average specific cake resistance measured by permeation will be proved to be exact in several means. The average specific cake resistance conventionally measured by filtration does not give correct results because it uses initial solid mass fraction of suspension. Then we calculated the changed solid mass fraction of suspension due to sedimentation during filtration by the experimental values obtained filtration-permeation method. We also determined the solid mass fraction at a certain moment of filtration from the suspension height and a new equation derived in this study. The two results were compared and proven that they almost matched.
분리기술 , 열역학 : 여과 평균 비저항값의 측정에 대한 고찰 - 입자 현탁액과 응집물의 케이크 여과
임성삼(Sung Sam Yim),송연민(Yun Min Song),전세진(Se Jin Jun) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.3
The exact measurement of average specific resistance in a cake filtration is fundamental and important for the industrial operation and research. In spite of the importance, the influences of the relative size between the particles in suspension and pores of filter medium, the initial concentration of suspension, the velocity of sedimentation during filtration, the pre-sedimentation time before the start of filtration to the measured values of average specific cake resistance were not been studied. These phenomena have been studied experimentally and analyzed, then the methods to eliminate such effects to measure the accurate specific cake resistance are proposed. A method or measuring the exact solid content of a cake for the floc filtration is also proposed. Without this method the average specific cake resistance would be measured only 52% of the exact value.