EVALUATION OF EFFICIENCY OF GAS-LIQUID APPARATUS WITH EJECTION GAS DISPERSION

DOI: 10.6060/tcct.20165912.5420
Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2016. V. 59. N 12. P. 107-111

Various constructions of gas-liquid dispersion devices with gas ejection which can be used to implement many of the processes taking place in the gas - liquid system are compared. Experimental methods for comparative evaluation of the efficiency of gas-liquid ejection ap-paratuses of various designs are considered. Three constructions of gas-liquid dispersion de-vices with ejection of gas were investigated: the gas-liquid jet apparatus, short ejector appa-ratus with a long ejector, and apparatus with combined (multilevel) ejector. Evaluation of effi-ciency was performed with two ways: chemical and photographic techniques. The chemical method is based on determining the effective phase contact surface, which was estimated using the "sulphite number" of oxygen chemisorption from air. With the help of the photographic method the efficiency ratio was determined which takes into account not only the rate of the process, but also the energy costs of its conduction. The smaller value of the coefficient of effi-ciency the apparatus operates efficiently, i.e. for a specific interfacial surface requires less en-ergy. Experimental studies were carried out in an apparatus with a diameter of 200 mm for a variety of pressure at the nozzle and diameter of the nozzle. The pressure at the nozzle was var-ied from 0.2 to 0.4 MPa, and the diameter of the nozzle - from 2 to 4 mm. For each experi-ment the "sulfite number" was determined and further the criterion of efficiency of gas-liquid system was calculated on the experimental data. Graphic dependences of "sulphite number" and coefficient of efficiency are presented for the differential pressure at the nozzle for three examined constructions of gas-liquid vehicles with the gas ejection. The findings on the effec-tiveness of devices using gas-liquid "sulfide method" and the efficiency ratio are in good agreement. For devices with a long ejector and ejector combined with coefficients of similar efficiencies, but these devices are much more efficient than the gas-liquid jet apparatus and the short ejector. On the values of «sulphite number" the device with a combined ejector is the most effective. This is due to the fact that in this device there is mass transfer intensification by increasing the contact surface and contact time of the interacting phases.

Key words: gas-liquid ejection apparatus, dispersion, «sulfite number", efficiency coefficient, comparative evaluation

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2016, Т. 59, № 12, Стр. 107-111

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