The present invention relates to a pneumatic conveying system and a circulating fluidized bed (CFB) boiler, belonging to the technical field of CFB boilers. The system comprises an air compressor that supplies compressed air to an air-powder mixer, a coal powder bin that stores coal powder and feeds it into the air-powder mixer via a powder feeder, and the air-powder mixer, which blends the compressed air and coal powder to output an air-powder mixture. The outlet of the air-powder mixer is connected to a main conveying pipe, which branches via a distributor to multiple conveying pipes. These conveying pipes are connected to secondary air pipes on the front, rear, and side walls of the CFB boiler in a sleeve-type manner, delivering the air-powder mixture into the furnace chamber. The invention enhances the load change rate of CFB units from the current 1% Pe/min to over 3% Pe/min, reduces the ignition restart temperature, extends the ignition hold time, and ensures safe and rapid load increase for CFB units.

A carbon sequestration system includes a furnace having an oxy-combustion burner, a mill configured to receive a fuel and to provide the fuel to the oxy-combustion burner, a waste heat recovery exchanger configured to receive a flue gas from the furnace, the flue gas ultimately supplied to one or more of an overfire air port of the furnace, the oxy-combustion burner, the mill, and a CO.sub.2 purification unit, the CO.sub.2 purification unit configured to produce a purified CO.sub.2 stream.

The present invention relates to a pneumatic conveying system and a circulating fluidized bed (CFB) boiler, belonging to the technical field of CFB boilers. The system comprises an air compressor that supplies compressed air to an air-powder mixer, a coal powder bin that stores coal powder and feeds it into the air-powder mixer via a powder feeder, and the air-powder mixer, which blends the compressed air and coal powder to output an air-powder mixture. The outlet of the air-powder mixer is connected to a main conveying pipe, which branches via a distributor to multiple conveying pipes. These conveying pipes are connected to secondary air pipes on the front, rear, and side walls of the CFB boiler in a sleeve-type manner, delivering the air-powder mixture into the furnace chamber. The invention enhances the load change rate of CFB units from the current 1% Pe/min to over 3% Pe/min, reduces the ignition restart temperature, extends the ignition hold time, and ensures safe and rapid load increase for CFB units.

A conical cylindrical distributor for particulate coal being fed from a mill/pulverizer to a combustion chamber has concentric, vaned flow channels terminating in dentillated plated extending partially across the flow paths directly at the outlet ends thereof to create turbulence and particle impact to better supply the combustion chamber with a uniform mixture of coal particles.