The auto-heat correting controller and method of coal moisture dryer

摘要

PURPOSE: An apparatus and a method for automatically correcting heat capacity of a coal moisture dryer is provided to minimize moisture deviation of coal at the exit of the moisture dryer by controlling steam charged into the moisture dryer using a steam pressure controller, thereby continuously correcting heat capacity correction value. CONSTITUTION: The method for automatically correcting heat capacity of a coal moisture dryer comprises the steps of selecting a calculation window for calculating heat capacity correction values in a display window(41); collecting process data related with heat capacity correction by the selection of the calculation window for calculating heat capacity correction values(42); storing the calculated heat capacity correction values in a data base by calculating the heat capacity correction values through the process data related with the collected heat capacity correction(43,44); converting the calculated heat capacity correction values into steam temperature and steam pressure(45,46); outputting the converted steam temperature and steam pressure signals as set values for a steam pressure cascade controller inside a PLC(47); outputting the calculated values into a dryer steam pressure control process after calculating the values outputted as the set values for the steam pressure cascade controller inside the PLC(47) in the controller inside the PLC(48); applying the values inputted into the dryer steam pressure control process to the steam pressure control process(49); and proceeding all of the subsequent steps again by proceeding to the step of collecting the process data related with the heat capacity correction if the steam pressure control process is unstable, and completing the process if the steam pressure control process is stable(50).