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Hydrodynamics Optimizing Methods and Tools Part 14

Tham khảo tài liệu 'hydrodynamics optimizing methods and tools part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 378 Hydrodynamics - Optimizing Methods and Tools After the specific mass transfer area was obtained the kL could be determined by a CO2 H2O absorption system. This is a physical absorption system the mass transfer resistance mainly lies in the liquid side film thus Ga kLaVCi 7 The parameters a V Cị could be obtained through the above-mentioned process. Thus the kL could be calculated from Eq. 7 and a GA kLV Ci . 2.6 The determination of the pressure drop of gas phase through the WSA The pressure drop of gas phase through the WSA i.e. the two points between the inlet and outlet of gas phase was determined using a U-type manometer as shown in Fig.2 with a water-air system as working medium. In order to know the interaction of the gas-liquid phases in the WSA the liquid content L in the gas phase at the gas outlet was also determined using a gas-liquid cyclone separator. In the experimental process the flow rate of the liquid phase should be larger than 1 m3 h which corresponds to the jet velocity of 0.381 m s so as to get an even jet distribution of the liquid phase in the jet area. The experimental operation process was similar with that for the air stripping of ammonia. In order to fully understand the characteristic of hydrodynamics in the WSA the gas phase inlet velocity was controlled within 4 20 m s wider than that in a traditional cyclone. 3. Results and discussion As mentioned above the objective of this work is to develop new air stripping equipment of industrial interest for the removal of volatile substances such as ammonia. Firstly to understand the overall performance of the WSA and how the major parameters affect the performance is very important. And a comparison between the WSA and some traditional air stripping equipment should be done to assess its performance. Then the effects of major process parameters on the mass transfer coefficient in liquid side film and specific mass transfer area were carried out so as to reveal the mass transfer mechanism