Dust reduction apparatus depending on supply of falling coal in coal drying apparatus using reheat steam

Abstract

The present invention relates to a dust reduction apparatus which minimizes dust generation when coal is dropped and supplied from an upper dryer to a lower dryer in a multi-stage dryer for drying coal using reheat steam. The present invention relates to a coal drying apparatus 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. The apparatus comprises a fixed quantity coal supplier for supplying a fixed amount of coal onto the surface heading for the top of a first transfer plate, and comprises a dust reducer consisting of: an inlet pipe coupled by a bearing to a discharge port of the fixed quantity coal supplier; a worm wheel coupled to the outer circumferential surface of the inlet pipe; a worm which is coupled by a gear to the worm wheel and which rotates by means of rotational force delivered from a motor; a bent pipe having an upper end coupled to the inlet pipe; and an outlet pipe coupled to one end of the bent pipe. In addition, the apparatus comprises: a first flattening device for uniformly dispersing and flattening a coal pile which is transferred after being dropped and inputted from the dust reducer onto the surface heading for the top of an upper first transfer plate; a first coal receiver which has a plurality of panels fixedly installed therein radially at a certain angle about a rotation axis between a pair of first driven sprockets; a second flattening device for uniformly dispersing and flattening the coal pile which is transferred after being dropped and inputted from the first coal dryer to the surface heading for the top of a lower first transfer plate through rotation of the first driven sprockets; a third flattening device for uniformly dispersing and flattening the coal pile which is transferred after being dropped and inputted from the first coal dryer to the surface heading for the top of an upper second transfer plate of the second coal dryer; a second coal receiver which has a plurality of panels installed therein radially at a certain angle about a rotation axis between a pair of second driven sprockets; and a fourth flattening device for uniformly dispersing and flattening the coal pile which is dropped and inputted from the second coal receiver to the surface heading for the top of a lower second transfer plate through rotation of the second driven sprockets, wherein the first coal receiver receives the coal pile dropped from the surface of the upper first transfer plate, is rotated according to the rotation of the first driven sprockets, and thereafter inputs the coal pile onto the surface of the lower first transfer plate to thereby inhibit dust, and the second coal receiver receives the coal pile dropped from the surface of the upper second transfer plate, is rotated according to the rotation of the second driven sprockets and thereafter inputs the coal pile onto the surface of the lower second transfer plate to thereby inhibit dust.

Description

technical field [0001] The present invention relates to a dust reducing device based on the supply of coal descending from a coal drying device using reheated steam, and more particularly to a dust reducing device in a multi-level dryer for drying coal using reheated steam In this process, dust generation is minimized when the coal is fed by descending from the upper dryer to the lower dryer. Background technique [0002] Generally, in a thermal power plant that uses coal as fuel to generate electricity, about 180 ton / hr of coal is burned per 500 MW, and each pulverizer supplies about 37 tons (ton) of coal to the boiler. A 500MW thermal power plant that uses coal has approximately 6 coal storage bins with a capacity of about 500 tons, 5 of which are normally supplied with coal, and the remaining 1 is a carbon storage plant that stores coal that can be used within a specified period as a reserve. [0003] Furthermore, in thermal power plants that use coal as fuel to generate...

AI Technical Summary

Problems solved by technology

The vibrating flow plate is used to uniformly mix low-grade coal and heavy oil ash, but there is a problem that the drying steam used to dry the coal cannot be sprayed uniformly on the surface of the coal, so the drying efficiency may decrease

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