Experimental study on dust suppression at transhipment point based on the theory of induced airflow dust production

摘要

Induced airflow is the main cause of dust problems at the transhipment point. However, the current measures for dust control are mainly from the perspective of dust control after production, focusing on blocking, lowering, discharging, removing and flushing. It is rare to manage dust from the source of occurrence, so dust pollution cannot be solved at the source. Based on the kinematics principles and the energy dissipation theory, this paper systematically summarizes the induced airflow dust production theory, improves the transfer chute, and proposes the compound straight-arc chute dust suppression technology. According to the similarity criteria, the experiment was carried out in the laboratory with the transportation of coal as an example. The experimental results show that with the decrease of particle size, the induced airflow velocity and dust concentration at the chute outlet show a linear growth trend and remains unchanged even when the feed volume changes. Compared with the upper-bend shape, when using a down-bend shape for the dust suppression chute in the process of transferring coal, the induced airflow velocity and dust concentration at the chute outlet can be reduced by 31% and 60%. Compared with a linear chute, the dust concentration is reduced by up to 77%. It indicates that the down-bend chute is a more energy-saving dust removal equipment that can be used to reduce operational costs while conveying coal.