Reduction of aerodynamic resistance of inertial-vacuum ash collector

Abstract

THE RELEVANCE of the research topic is due to the existence of an environmental problem associated with harmful emissions into the atmosphere. The most highly efficient are electrostatic precipitators and fabric filters (~90-99.5% capture). Against the background of these devices, inertial one’s lag behind both in terms of their catching efficiency and the catching spectrum of the ash particle size distribution. The research carried out in the article is aimed at creating such an inertial apparatus that would have both minimal resistance and high efficiency. PURPOSE. Consider the possibility of reducing aerodynamic resistance by changing the design of the device, namely, by increasing the diameter of the inlet pipe in the inertial-vacuum ash collector. Consider a number of other ways to further reduce the aerodynamic drag of the apparatus. To identify the prospects and assessment of capital costs for the reconstruction of the ash collector. METHODS. When solving the problem, the method for calculating the dynamics of a dispersed flow in an inertial-vacuum ash collector, implemented by the MFD, was used. RESULTS. The article describes the relevance of the topic, considers the results of a numerical calculation. The calculation of the influence of boundary conditions, which include the flow rate at the inlet, thermal and hydraulic parameters of the flow of exhaust gases at the inlet to the ash catcher, in relation to the desired pressure drop across the apparatus, as well as the collection efficiency, was made. This article describes the process that results in a change in the hydraulic characteristics along the flow part of the IVAC. CONCLUSION. A change in the design of the apparatus leads to a decrease in the resistance of the IVAC, while these changes are extremely sensitive to the effect on the degree of purification. Calculations have shown that this method justifies itself in terms of reducing resistance. The pressure drops ranges from 279.8-1273 mm. water. pr. The convergence of the iterative calculation, taking into account the quality of the grid, provides flexibility, is achieved by fewer iterations, but the time spent on the calculation does not decrease.