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임진남,김기창 ( Jin Nam Rhim,Ki Chang Kim ) 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.5
Heats of mixing are the sensitive representation of the nonidealities of the liquid mixtures, which appear to be caused from the differences in molecular size, the type of molecular distribution and the interaction energy of molecules. The vapor-liquid equilibria as well as the heats of mixing for the liquid mixtures have been studied by many authors and the results of those studies were analyzed from the viewpoint of then on idealities of the liquid mixtures. In this review it is intended to summarize mainly the theoretical background of the heats of mixing based on both the group solution theory and the association theory which were developed in recent years.
亂流接觸泡塔內에 있어서의 Gas Hold-Up과 氣泡平均上昇速度에 관하여
林鎭男 漢陽大學校 1971 論文集 Vol.4 No.-
These Experimental studies were carried out to make clear the effects of the suspended solid particles on the gas hold-up and the average velocity of the gas bubbles in the T.B.C. and to make sure the better contact efficiencies of the T.B.C. than that of the normal gas bubbles columns with the above basic informations. The T.B.C. is nothing but the normal bubble column suspended with inlet solid particles when the column is operated by blowing air or gases into the bottom of the cloumn. Generally, it is known that the liquid-side mass transfer coefficients in the bubbling process have the greater values than that in the gas absorption process when the resistance of the liquid side is the controlling step in the physical or chemical mass transfer operation between gas and liquid phase. 1), 2), 3) Those results of this study suggest that liquid-side mass transfer coefficient in the T.B.C. may have greater value than that in the normal gas bubble column when the liquid-side mass transfer coefficient is the important factor for the overall mass transfer process at some operation condition. The apparatus used in the experiments is shown on Figure 1. The gas hold-up was calculated from experimental values of hydrostatic pressure and iron equation (3) . The results obtained are summerizcd as fell-ows : (1) When the x (the mass suspended) has the value of 0.116, the gas hold-up has the maximum value, and when the x are greater than 0.19, the values of gas holdup are less than that of the normal gas bubble column. (2) In the case of the polyoropylene compound suspension, the average velocity of bubbles rising through the dense phase has a less value than that of the normal gas bubble column. And experimental equations on the gas hold-up and the velocity of gas bubbles was were obtained as follows for the case of 30 grams of the polypropylene compound suspension. i) for the column length in which the gas and the liquid are uniformly distributed Vo=15 (1-φo) at (1-φo) < 0.3, Ug <10cm/sec Vo=140 (1-μo) at (1-φo) > 0.3, Vg> 10cm1sec ii) For the column length in which the total gas and liquid are distributed V=120 (1-φ) at (1-φ) 0.3
임진남 한국화학공학회 1971 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.9 No.3
Theoretical equation was established for calculating the conversion of carbon monoxide in the primary flue gas into carbon dioxide by contacting the primary flue gas with the secondarily introduced fresh air. The experimental results confirmed the usefulness of this equation. Though the combustion mechanism of the briquet (22 holes) may be much complicated, the mechanism of combustion could be simplified by careful attention upon the gas phase reaction ; the considerable extent of carbon monoxide in the primary flue gas could be converted into carbon dioxide by the intimate contact with hot fresh secondary air which was heat exchanged during it's introduction through the pipe installed at the center or the side of the briquet furnace. The gas treating experiment was made to decrease the carbon monoxide content in the flue gas by using ash-briquet. The ash-briquet was placed on the upper part of burning briquets. The gas analysis showed the following ; when temperature of ash-briquet was below about 600℃, adsorption of carbon monoxide and dioxide into the porous briquet was verified. As the temperature went up to about 600℃ desorption of the gases from the ash-briquet was observed.