Push type flue gas circulating fluidized bed desulfurization device and method thereof

The invention discloses a push-type flue gas circulating fluidized bed desulfurization device and a push-type flue gas circulating fluidized bed desulfurization method. The device comprises a circulating fluidized bed desulfurization tower, a water supply system, a desulfurizing agent supply system, a dust removal system and an ash supply system, wherein the ash supply system comprises a first conveying mechanism, an ash collecting mechanism, a metering valve and a second conveying mechanism which are sequentially arranged in the ash flowing direction and allow smoke to flow; the conveying working face of the first conveying mechanism is located below a dust outlet of a bag-type dust collector; and a dust outlet end of the second conveying mechanism is communicated with the circulating fluidized bed desulfurization tower. Through cooperation of the first conveying mechanism, the ash collecting mechanism, the metering valve and the second conveying mechanism (namely, a scraper conveyor,a ship-shaped ash hopper