The article considers a solution to the problem of increasing the productivity of a vortex column of sulfuric acid concentration in the resulting 92% sulfuric acid to 100 t/day and above. The design of the upgraded vortex contact stage is presented, which makes it possible to increase the throughput capacity of the vortex column through the gas and liquid phases. To increase the throughput through the gas phase and reduce the material consumption, the stage is made without a contact pipe. At the same time, in comparison with the vortex stage of an industrial column, the diameter of the gas passage opening of the plate and the area of the swirler slots have been increased, and additional liquid inlet and outlet pipes from the stage have been installed. The results of experimental studies of the hydrodynamic characteristics of a vortex contact stage (VCS) are presented in the form of graphical dependencies and equations describing changes in hydraulic resistance, spray flow, and retention capacity from the flow rates of the gas and liquid phases. The hydraulic resistance of the vortex stage increases with increasing gas velocity in the vortex slots, which satisfies the turbulent motion of the two-phase flow in the vortex device. With increasing fluid flow, there is a slight increase in hydraulic resistance.. It is determined that during the operation of the vortex stage, the necessary liquid spray is provided for the fog-free operation of the column. The retention capacity of the liquid phase decreases with an increase in the flow rate of the gas phase, and increases with an increase in the flow rate of the liquid. In the operating velocity range of the gas flow in the vortex slots (10-20 m/s), the vortex stage has a high retention capacity in the liquid phase. The vortex stage is operable in a wide range of load variations in the gas and liquid phases. The VKS design was used as a working stage in the development of an upgraded sulfuric acid concentration vortex column with increased productivity.
SPENT SULFURIC ACID, VORTEX COLUMN, VORTEX CONTACT STAGE, HYDRAULIC RESISTANCE, RELATIVE SPRAY LOSS, HOLDING CAPACITY IN THE LIQUID PHASE
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