Coal driving system using reheat steam

Abstract

Provided is a coal drying system, and more specifically, a coal drying system using reheat steam comprising: a coal sorting device for sorting coal which has been transported by a coal transport conveyer from a coal yard, and respectively discharging the coal onto a fueling coal transport conveyer and a drying coal transport conveyer; a fluidizing reheater for storing the coal which has been sorted as fuel coal and transported into a fuel coal storage tank, and heating the fuel coal stored in the coal storage tank to a fluidized state and generating reheat steam at a specific temperature; a coal drying device for drying the coal by spraying the reheat steam generated by the fluidizing reheater on the coal, while the coal, which has been transported by the drying coal transport conveyer and passed through a coal distributing conveyer, is transported through multiple steps; and a combustion gas reheater for generating reheat steam at a specific temperature from exhaust gas generated after the coal is dried in the coal drying device by using combustion gas generated in the fluidizing reheater.

1 . A reheat steam type coal drying system comprising:
 a coal sorting device that sorts coal transported via a coal transport conveyer from a coal yard into a fuel coal and a drying coal and discharges the coal to a fueling coal transport conveyer and a drying coal transport conveyer, respectively;   a fluidizing reheater that stores the coal sorted and transported as fuel in a fuel coal storage tank, and heats the fuel coal stored in the coal storage tank to a fluidized state to generate reheat steam at a constant temperature;   a coal drying device that dries the coal by spraying the reheat steam generated by the fluidizing reheater to the coal, while the coal introduced via a coal distributing conveyer for distributing the coal is transported by the drying coal transport conveyer through multiple steps; and   a combustion gas reheater that generates reheat steam at a constant temperature in exhaust gas generated after the coal is dried in the coal drying device by using combustion gas generated in the fluidizing reheater.   
     
     
         2 . The system of  claim 1 , wherein the coal sorting device comprises a magnetic separator that separates a metal substance from coal material using a magnetic field before being charged into a coal screen in a coal transport conveyor, a coal screen that preliminarily separates coal of a certain particle diameter or less from the coal transported from the coal yard to the coal transport conveyor, a coal pulverizer that pulverizes the coal of a certain particle diameter or more separated from the coal screen, a two-way damper that separates the coal pulverized by the coal pulverizer into a fuel coal and a drying coal, a coal supply tank for fuel that temporarily stores the coal separated as a fuel coal by the two-way damper and then supplies the coal, and a coal pulverizer that discharges the coal through a fuel coal transport conveyor after pulverizing the coal supplied from the coal supply tank to a certain particle or less. 
     
     
         3 . The system of  claim 2 , wherein the coal separated by the coal screen or separated as a drying coal by the two-way damper can be connected so as to be discharged to a drying coal transport conveyor. 
     
     
         4 . The system of  claim 1 , comprising:
 a coal distribution conveyor that distributes the drying coal into a plurality of coal dryers in the drying coal transport conveyor, a coal distribution tank that temporarily stores the coal transported by the coal distribution conveyor and then distributes the coal, and a coal fixed amount supplier that supplies the coal distributed from the coal distributor tank to the coal drying device at a certain amount.   
     
     
         5 . The system of  claim 1 , further comprising:
 a dry coal discharge conveyor that naturally cools the coal dried in the coal drying device at room temperature, a dry coal transport conveyor that transports the coal discharged from the dry coal discharge conveyor to a dry coal storage tank, and a carry-out place dust collector that collects the dust generated during transport of the coal on the dry coal transport conveyor.   
     
     
         6 . The system of  claim 1 , further comprising:
 a plurality of exhaust gas circulation blowers that sucks and blows the exhaust gas generated after the coal drying in coal drying device, and a circulation exhaust gas dust collector that collects the circulation material contained in the exhaust gas blown by the exhaust gas circulation blower.   
     
     
         7 . The system of  claim 1 , further comprising:
 a carry-in place dust collector that collects the dust during transport of the coal in the coal transport conveyor, the coal sorting device, the fuel coal transport conveyor, the drying coal transport conveyor and the coal distribution conveyor.   
     
     
         8 . The system of  claim 1 , wherein the system is configured to supply the reheat steam to each of the plurality of coal drying devices installed in the fluidizing reheater and the combustion gas reheater.