1. SINOPEC Research Institute of Safety Engineering, State Key Laboratory of Safety and Control for Chemicals, Qingdao, Shandong 266071, China 2. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266061, China
Abstract：Venturi scrubbers are widely applied in gas adsorption and industrial dedusting fields as they have advantages of simple structure, high efficiency and convenient operation. Nowadays, computational fluid dynamics (CFD) method has become a more efficient and useful tool to explore the gas liquid flow characteristics and mass transfer process in Venturi scrubbers as the development of computing ability. Based on the process of hydrogen sulfide gas absorption by sodium hydroxide solution in a self-priming Venturi scrubber, the injection ability, mixing degree as well as scrubbing efficiency at different operation conditions were studied by using the two fluid models, the RNG k?? turbulent model and the species transport model in CFD method. The accuracy of simulated injection flow rates were verified by the experimental data. The simulation results showed that, with increase of gas velocity, the injection flow rate increased, but the homogeneity of radial liquid dispersion in the diffuser became worse. The liquid phase was inclined to flow near the wall, which did not benefit for the hydrogen sulfide absorption process. With the increase of the distance above the throat, the velocities of gas and liquid decreased, resulting in more uniform radial liquid dispersion. In the hydrogen sulfide absorption process, the interphase chemical reaction mainly occurred in one fifth of the diffuser above the throat. In this area, the interphase chemical reaction rate increased and then decreased with the increasing distance above the throat. Therefore, the highest chemical reaction rate did not occur at the throat, but at nearly 5% of the diffuser above the throat. As the gas velocity increased, the interphase chemical reaction rate and scrubbing efficiency became higher, while the hydrogen sulfide concentration and scrubbing time decreased. The research findings provided the basis for the optimization of structure parameters and operation conditions in self-priming Venturi scrubbers.
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2018, Vol. 18 
