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US 4,184,640 AGranted
Coal grinding apparatus for direct fired burners
OwnerRobert M. Williamsinventor
Life of this patent
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Abstract
Coal grinding apparatus for direct coal fired burner systems in which coal usage is regulated by a speed controlled roller grinding mill operated in conjunction with a speed controlled spinner separator to control the size and volume of the coal output to match the requirements of the burner, and means to transport and control the transport of the properly sized coal to the burner by either a negative or positive acting fan.
Claims6
In coal grinding apparatus for direct fired burners, the combination of:
- a roller mill having a grinding chamber with an inlet for the coal to be ground and a discharge for ground coal;
- grinding rolls rotatable within said grinding chamber for grinding coal by centrifugal force of said rolls against said grinding chamber;
- a source of gaseous medium connected into said grinding chamber for moving ground coal through said grinding chamber discharge;
- a second chamber connected to said grinding chamber adjacent said discharge for receiving the ground coal;
- rotary classifier means in said second chamber operable for classifying the ground coal for particle size and returning oversize coal to said grinding chamber;
- separate prime mover means connected to said grinding rolls and to said rotary classifier means;
- and control means connected to each of said prime mover means, said control means being effective to vary the speed of each of said separate prime mover means, whereby ground coal particle size discharged from said second chamber is maintained substantially uniform through adjusting the centrifugal force exerted by said rolls inversely with speed of said rotary classifier means.
4 more elements
Dependencies are inferred from the claim text.