STUDY OF MASS-TRANSFER COEFFICIENT IN RECTANGULAR CONTACT DEVICES
Work represents the urgent task of increasing the efficiency of the apparatus with contact devices, that is intended for performance heat and mass transfer processes in petrochemical, chemical and energy industries. The schematic sketch of the developed jet-film contact device is presented and its operation principle is described. The key advantages of the device are low metal consumption, ease of use and relatively low hydraulic resistance. Based on a model of surface updating, the calculation of the mass transfer coefficient in jet-film contact devices on vertical partitions is carried out. Dependences of mass transfer coefficient on the width of contact elements under change of average gas velocity and liquid-gas flow ratio are depicted. It is shown that for transport phenomena intensification in the developed jet-film contact device, an increasing of the mass transfer coefficient value on the vertical plates is required. For its growth, it is necessary to increase the average gas flow rate and reduce the overall dimensions of the contact elements to optimal values. The studies have shown that an increase in the average gas flow velocity by 1 m/s results in an increase in the mass transfer coefficient by an average of 19 %. However, it should be noted that when the gas velocity increases, the increase in the mass transfer coefficient gradually slows down and the energy consumption of the process rises. It has been found that the growth in the liquid-gas flow ratio practically does not affect the change in the mass transfer coefficient, thus the developed device can be used to carry out heat and mass transfer processes with a relatively high flow rate.