Modernization of inertial-vacuum ash collector

Abstract

Various variations of reducing the aerodynamic resistance of devices with a complex configuration of the flow path are considered. About 50% of power plants in the Russian Federation operate on coal, while two-stage cleaning is used in the ash collection process. Modern coarse ash collectors can achieve an efficiency of 55 – 80%, depending on the period of their work. It is advisable to reduce the number of purification stages by upgrading with the use of modern cleaning devices, which allow achieving high efficiency in cleaning a dusty flow and less subjecting this treatment complex to repair work. The inertial-vacuum ash collector (IVAC) provides trapping of a wide range of studied particles (1 – 100 microns) with an efficiency of up to 99%. This device was tested at the combined heat and power plant of the city of Omsk, and in addition to high efficiency, increased aerodynamic resistance was established. The aim of this work was to achieve an aerodynamic resistance of 660 Pa (resistance of the cyclone apparatus, so that the apparatus can be used as the first, and consequently as two stages of cleaning) while maintaining the efficiency of the apparatus. To achieve this goal, the IVAC uses the method of perforating holes along the divider for the subsequent decrease in speed in the confuser channel and a general decrease in resistance on the device. Perforation is carried out at three different heights, the distance between which is 1 meter. The study used the analysis of a numerical experiment in ANSYS CFX using a k-ε mathematical model (mass ash content 70 g/kg; One-way Coupling). Recommendations for further prospects for the study of the IVAC are proposed.