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A gas-solid separator of a recirculating fluidized bed boiler comprises a downward flue and an upward flue which are separated from front to back by a membrane-type guided flue gas downward and upward turning screen; the downward flue and the upward flue are communicated with each other through a swerving passageway and a feed bin which is hermetically installed below the downward flue and the upward flue; a flue gas inlet is arranged at the front upper part of the gas-solid separator and a flue gas outlet is arranged at the back upper part of the gas-solid separator; four walls of the gas-solid separator are all water cooled walls which are integrated with the boiler; the gas-solid separator further comprises a flow equalizing and separating tube bundle and an abrasion-proof communication pipe which are located on the swerving passageway; the upper end of the flow equalizing and separating tube bundle on the swerving passageway is communicated with a lower cross collecting tank of the membrane-type guided flue gas downward and upward turning screen, and the lower end of the flow equalizing and separating tube bundle on the swerving passageway is communicated with a cross collecting tank of the feed bin; and the upper end of the abrasion-proof communication pipe on the swerving passageway is communicated with the lower cross collecting tank of the membrane-type screen, and the lower end of the abrasion-proof communication pipe on the swerving passageway is communicated with a cross collecting tank of the communication pipe. In the case of circulation at low ratio, inertia gravity is used for single stage separation, and in the case of circulation at high ratio, when the speed of the smoke in the upward flue is high, low-temperature cyclone separation can be combined with inertia gravity separation for double-stage separation.

The invention discloses a circulating fluidized bed external heat exchanger with improved gas-solid flow and gas-solid heat exchange uniformity. The circulating fluidized bed external heat exchanger comprises a front wall (1), a rear wall (2), a top plate (3), a bottom air distribution plate (4), a left wall (5), a right wall (6), a cooling bin A air chamber (8), a mixing bin air chamber (9), a partition wall A (10), a mixing bin (11), a cooling bin A (12), a circulating ash inlet (15), a circulating ash outlet (16), an inlet steam header A (17), an outlet steam header A (18) and a heated surface tube panel A (19). The roughness of the inner wall of the cooling bin A (12) is lower than 100 micrometers, the cooling bin A (12) and the bottom air distribution plate (4) form an angle of 80-90 degrees, so that stagnant areas on the peripheral wall of the cooling bin A (12) are effectively eliminated, gas-solid flow and gas-solid heat exchange uniformity of the external heat exchanger are improved, and heat deviation of a working medium is reduced.