device for preventing flow of coal combustion in coal drying device using superheated steam

摘要

The present invention relates to an apparatus for preventing, in a multi-stage dryer for drying coal using reheat steam, spontaneous ignition caused by oxidation of coal when coal is transferred to the multi-stage dryer from a fixed quantity coal supplier by way of a pulverizer. The present invention relates to an apparatus for drying coal using reheat steam, the apparatus being configured so that coal which has been dried primarily in a first coal dryer is inputted into a second coal dryer and thus is secondarily dried, wherein reheat steam generated from a reheater is supplied through a reheat steam supply pipe; a nitrogen supplier supplies nitrogen through a nitrogen supply pipe; saturated steam generated from a saturated steam generator is supplied through a saturated steam supply pipe; the reheat steam supply pipe, the nitrogen supplier, and the saturated steam supply pipe are connected to a 4-way valve; and the 4-way valve supplies nitrogen and saturated steam, or nitrogen or saturated steam, along with reheat steam, to first to fourth steam chambers through the steam supply pipe, and injects steam into coal which is transferred to a first transfer plate and a second transfer plate so that spontaneous ignition of coal is prevented in the course of drying and transferring coal.