Circulating fluidized bed combustion desulfurization ash reuse method and system

Abstract

The invention discloses a circulating fluidized bed combustion desulfurization ash reutilization method and system thereof, and relates to the reutilization of desulfurization ash during the solid fuel combustion process of a circulating fluidized bed. The system includes a combustion chamber, a reduction chamber, a regeneration chamber, The first gas-solid separator, the second gas-solid separator, the third gas-solid separator, the first return device, the second return device, the third return device and the gas combustion chamber, the method will circulate fluidization In the bed combustion desulfurization process, the desulfurization ash is reduced to generate CaO, CaS and SO2, and then the CaS is oxidized and calcined to obtain CaO and SO2. The regenerated CaO can be recycled for fluidized bed combustion desulfurization, and the separated SO2 atmosphere can be used for sulfuric acid processing. The system and method of the invention are beneficial to the treatment of desulfurization products, improve the overall economic benefits, and are beneficial to the enlargement of the circulating fluidized bed.

Description

technical field [0001] The invention relates to a circulating fluidized bed combustion desulfurization ash recycling method and system, in particular to a method for processing the circulating fluidized bed desulfurization ash. Background technique [0002] As a clean coal combustion utilization method, circulating fluidized bed combustion can adopt desulfurization method in the combustion process. Desulfurization during the combustion process relies on adding calcium-based desulfurizer particles in an appropriate particle size range to absorb SO produced during the combustion process 2 , to CaSO 4 The form will be SO 2 immobilized in the solid phase. A large amount of CaSO is produced due to desulfurization by circulating fluidized bed combustion 4 This kind of ash is difficult to deal with in conventional ways, and most of them are disposed of by stacking and landfilling. Occupying a large amount of land resources and causing pollution to the environment, it is very n...

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Problems solved by technology

Occupying a large amount of land resources and causing pollution to the environment, it is necessary to develop and propose a method for dealing with desulfurization ash from circulating fluidized bed combustion

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