Direct exhaust dust collection method

The invention discloses a direct exhaust dust collection method, belonging to a method for collecting dust in the field of dust. The method aims to solve the problems that multiple small-power centrifugal fans are used for replacing one large-power centrifugal fan of an existing large pulse dust remover and the total power of the multiple small-power centrifugal fans is less than the power of the large-power centrifugal fan. According to the technical scheme adopted by the invention, an air return preventing centrifugal fan with an air closing plate (11), designed for direct exhaust dust collection, is directly arranged on a dust collector to directly suck air of an upper air chamber of the dust collector and directly discharge the air out of the dust collector, so that the purpose of energy-saving and dust-removing production is achieved.