Patent ID: 9746179
Date: 2017-08-29
CPC Classifications: F23C,F23K,F23N

Claim:
1. A coal fed power generation system comprising: a mill in fluid communication with a furnace; wherein the mill is operative to pulverize coal and to ventilate the coal; the furnace comprising more than one burner or burner nozzles operative to receive the coal from the mill and combust it in the furnace; and a plurality of flow control devices including a first and a second flow control device in fluid communication with the mill and with a respective first and second burner or burner nozzle; wherein the first flow control device may be closed to prevent fluid communication between the mill and the furnace during the operation of the furnace; a classifier disposed downstream of the mill and upstream of the furnace, in fluid communication with the mill and the furnace, operative to separate coal particles of a given size from a remainder of the coal particles of the pulverized coal; a recirculator disposed downstream of the classifier, and separate from the classifier, and operative to recirculate back to the mill gas and coal particles that have passed the classifier; and a computer and a database in electrical communication with the flow control devices and the recirculator, the computer being configured to control the recirculator to adjust an amount of the gas that is recirculated to the mill after having passed the classifier; wherein the computer is configured to automatically adjust the flow control devices and the recirculator in dependence upon the type of coal used in the mill and furnace.