US4993332A - Hybrid fluidized bed and pulverized coal ...
The pulverized coal conveyed to the pulverized coal burners may also originate from a pulverized coal source operated independently from the boiler and without the intermediation of the coal mill 1. The mixture consisting of the pulverized coal and gas is delivered from the coal mill 1 via a duct 5 to at least one pulverized coal burner 6.