Justification of the layout and operating mode of a vortex-dedusting device as part of heat recovery units in agro-industrial facilities

Abstract

Annotation Purpose. Determination of the efficiency of functioning of the centrifugal dust collector of exhaust ventilation air when supplied to the heat exchanger, and the parameters of the dedusting device. Methods. The specificity of the problem being solved determines the use of an analytical method for research, which allows us to consider the general scheme of the process flow, without specifying the dimensional characteristics. The research technique involves the compilation of differential equations of the motion of particles in a swirling air flow and determination of the trajectory of their movement. Results. The possibility and feasibility of using a direct-flow cyclone for dedusting ventilation emissions from an industrial premises before feeding to a heat recovery unit is considered. To assess the efficiency of dust cleaning, a mathematical description of the dynamics of motion of dust particles in a vortex flow of a direct-flow cyclone has been formulated. Analytical dependences are obtained, according to which the trajectories of motion of dust particles in projections onto the transverse and longitudinal planes of the cyclone body are calculated. The formulas obtained make it possible to determine the design and operating parameters of the dedusting device and to estimate the size of particles, the capture of which is provided by the proposed device. Conclusions 1. A rational layout diagram of a heat recovery system for ventilation air of industrial facilities has been determined, which in series connects a once-through cyclone with an impeller and a tube-plate heat exchanger. 2. A mathematical description of the dynamics of the motion of dust particles in a vortex flow has been formulated and investigated, and calculation formulas have been obtained for calculating the trajectories of motion of particles, which are used to determine the design and operating parameters of a direct-flow dust cleaner. Keywords: ventilation emissions, heat exchanger, dedusting of the air flow, direct-flow cyclone, particle trajectories.