Abstract: 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.

Abstract: 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.

Abstract: An online monitoring device for fouling and slagging based on capacitance principle differential measurement includes multiple measuring devices arranged at the same height of the boiler heating surface. Each measuring device includes a fixed sleeve and a sensor, one end of the fixed sleeve is fixed on the boiler heating surface, the sensor is connected with the fixed sleeve through screw threads, the end of the sensor near the boiler is equipped with a measuring probe. When measuring the thickness of ash residue on the monitoring surface, three sets of the measuring devices are at the same height of the monitoring surface. Each sensor is adjusted at a different position in the corresponding fixed sleeve to realize the differential measuring on ash residue thickness. Thus, the thickness of ash residue on the monitoring surface can be calculated based on the measured capacitance by applying the capacitance formula of planar capacitor.

Abstract: An online monitoring device for fouling and slagging based on capacitance principle differential measurement includes multiple measuring devices arranged at the same height of the boiler heating surface. Each measuring device includes a fixed sleeve and a sensor, one end of the fixed sleeve is fixed on the boiler heating surface, the sensor is connected with the fixed sleeve through screw threads, the end of the sensor near the boiler is equipped with a measuring probe. When measuring the thickness of ash residue on the monitoring surface, three sets of the measuring devices are at the same height of the monitoring surface. Each sensor is adjusted at a different position in the corresponding fixed sleeve to realize the differential measuring on ash residue thickness. Thus, the thickness of ash residue on the monitoring surface can be calculated based on the measured capacitance by applying the capacitance formula of planar capacitor.