the gate valve the sleeve is then pressurized with air or inert gas the gate valve is then opened and the piston is driven through the sleeve to force the coal out through the opening into a gas mixing chamber 32 as the first sleeve is being emptied the second sleeve is being reciprocated and filled after the first sleeve has been fully emptied the piston in the second sleeve is actuated as the first sleeve is being retracted and then filled this alternate filling and emptying of the sleeves results in a continuous high pressure flow of dry pulverized coal into the gas mixing chamber 32 the gas mixing chamber 32 is a space to transition from the pump outlet geometry to the conveying line into which the pulverized coal is injected at a high pressure and into which a high pressure air or other suitable gas stream 34 is injected from the gas compressor 36 the high pressure gas stream entrains the pulverized coal from the gas mixing chamber 32 and pneumatically conveys the coal through the conveying lines 38 and the flow splitters 40 to the burners of the high pressure combustor 10 as illustrated in the drawing a flow splitter 40 may be used to feed multiple burners depending on burner velocity requirements and number of splits additional compressed gas may be injected at the flow.