An account is given of the experience of research, development, application, and design refinement of counter swirling flow vortex dust collectors used in newly designed or renovated aspiration systems for dust cleaning in chemical, metallurgical, and construction industries. Various updated designs of vortex dust collectors for enhancing their dust cleaning efficiency are given. Keywords: counter swirling flow vortex dust collectors, dust collector efficiency, separation chamber, mobile unit.For cleaning dust-laden air from solid impurities, use is often made of counter swirling flow vortex devices (CSFVD) because of their high technoeconomic and energy indexes [1]. Experimental studies of CSFVD [2, 3] made it possible to create a wide series of standard-sized dust-separating equipment based on CSFVD.The demand for vortex dust collectors in Ukrainian chemical, metallurgical, and oil refining enterprises as well as for producing a wide variety of building materials [4, 5] is quite high.A specialized aspiration, dust collection, and conditioning group was organized within the structure of the Ukrainian private engineering company Severodonetsk ORGKhIM for studies of problems of cleaning dust-bearing flows employing CSFVD-based equipment.Preliminary selection and designing of a vortex device of a specific standard size with rated design and operation conditions helps evaluate at the predesign stage the technical data of the aspiratiing device developed with due regard for the real operation conditions. Dust collection efficiency index and power consumption level obtained by calculation are generally not precise enough. The currently available vortex dust collector calculation procedures do not allow one to take account of process peculiarities and specific operation conditions, such as the degree of fluctuations of the flow rate of the medium being cleaned, time-dependent change in concentration of dust particles and their fineness, aggregation of particles, variation in moisture content and temperature, etc.In order to get data on predictable efficiency of newly designed or renovated aspiration system, preliminary tests of the CSFVD model should be conducted directly under the process conditions. Such tests involve additional material and timerelated costs, which, as experience shows, are fully paid back in the future.For preliminary tests under process conditions, use was made of a mobile installation based on the VAVZP-200Ts CSFVD model with a cylindrical separation chamber of 200 mm diameter (Fig.

The area of the contact surface of phases is one of the main hydrodynamic indicators determining the separation and heat and mass transfer equipment calculations. Methods of evaluating this indicator in the separation of multicomponent two-phase systems were considered. It was established that the existing methods for determining the interfacial surface are empirical ones, therefore limited in their applications. Consequently, the use of the corresponding approaches is appropriate for certain technological equipment only. Due to the abovementioned reasons, the universal analytical formula for determining the interfacial surface was developed. The approach is based on both the deterministic and probabilistic mathematical models. The methodology was approved on the example of separation of two-phase systems considering the different fractional distribution of dispersed particles. It was proved that the area of the contact surface with an accuracy to a dimensionless ratio depends on the volume concentration of the dispersed phase and the volume of flow. The separate cases of evaluating the contact area ratio were considered for different laws of the fractional distribution of dispersed particles. As a result, the dependence on the identification of the abovementioned dimensionless ratio was proposed, as well as its limiting values were determined. Finally, a need for the introduction of the correction factor was substantiated and practically proved on the example of mass-transfer equipment.

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