Development of mathematical model of tangential regeneration of filter partitions of small-sized dust collecting devices of power plants

Abstract

The energy development vector is currently aimed at increasing application of renewable fuels. Air pollution is one of the most significant consequences of fuel combustion. The issue is of current importance for small power plants subordinate to the Department of Public Utilities of the Ministry of Defense of the Russian Federation. To solve the problem, it is necessary to both update the existing equipment and to develop fundamentally new gas cleaning equipment that have high cleaning efficiency, reduced hydraulic resistance and smaller size. Thus, these issues determine the relevance of development of mathematical models of filtering equipment operation. To solve the problem, the method of mathematical modeling is used. The model uses the mathematical apparatus of aerohydromechanics using the k- turbulence model. The study of the influence of parameters on the flow of the process has been carried out by numerical methods in the computational fluid dynamics software environment. A mathematical model is proposed that allows us to determine and design pressure and velocity fields in the gap between the filter housing and the filter element at different speeds of the inlet gas flow. It makes possible to quickly assess the degree of clogging of the filter according to the dynamics of pressure changes at the outlet pipe of the filter. The results of the numerical experiment have been confirmed by laboratory studies. The developed mathematical model of the process of tangential regeneration of filter baffles makes it possible to estimate the pressure and velocity fields in the gap that influence on the entrainment of dust particles. Thereby one can predict the efficiency of the filter depending on the specific gas load and the width of the gap. The results of numerical experiments are consistent with the physical concepts of the process. They prove the prospects of the method to create a tangential flow to remove the settled particles of the dispersed phase from the surface of the filter element. The developed model can be used in the engineering practice of designing filters and controlling the filtration process.