PREVENTING REVERSIBLE TYPE AIR DUCT FOR PULVERIZER

摘要

The present invention provides an air duct structure for preventing the back flow of non-branched residual coal, capable of preventing a spontaneous combustion due to residual coal and rock pieces which flow back to an air duct and are stacked. According to an embodiment of the present invention, disclosed is the air duct structure for preventing the back flow of non-branched residual coal, wherein the structure includes a scraper which removes residual coal and rock pieces introduced to the bottom surface from a table from the bottom surface by a rotation and a blocking plate which is installed at the circumference where the outer diameter of the rotating scraper meets the air duct and prevents the residual coal and the rock pieces from entering the duct.