GAS-SOLID SEPARATOR FOR CIRCULATING FLUIDIZED BED BOILER AND BOILER CONTAINING SAME

摘要

A gas-solid separator for a circulating fluidized bed boiler comprises a descending flue (8) and an ascending flue (16) separated from front to back by a membrane screen for guiding the vertical turning of flue gas (9) therein. The descending flue (8) and ascending flue (16) are in communication via a turning channel (20) and a material storage (21) hermetically mounted thereunder. A flue gas inlet (6) is provided on the front upper part of the gas-solid separator, and a flue gas outlet (19) is provided on the rear upper part of the gas-solid separator, and all the four walls of the gas-solid separator are heated water-cooled walls (14) integrated with the boiler. The gas-solid separator further includes tube bundles (30, 31, 32, 33)for separating homogenous flows and an abrasion resistant connection pipe (39) positioned on the turning channel (20); the upper ends of the tube bundles (30, 31, 32, 33)for separating homogenous flows on the turning channel (20) are in communication with a horizontal collecting tank (43) under the membrane screen, and the lower ends of tube bundles (30, 31, 32, 33)for separating homogenous flows are in communication with a horizontal collecting tank (23) behind and below the material storage; the upper end of the abrasion resistant connection pipe (39) on the turning channel (20) is in communication with the horizontal collecting tank (43) under the membrane screen, and the lower end of the abrasion resistant connection pipe (39) is in communication with a horizontal collecting tank (40) of the connection pipe. The circulation at a low or high rate employs a single stage inertia gravity separation, and when the flue gas speed in the ascending flue is relatively high, a high rate of circulation can be combined with low temperature cyclone separation.