Semi-dry desulfurization system and semi-dry desulfurization process by aid of fly ash

Abstract

The invention discloses a semi-dry desulfurization system by the aid of fly ash. The semi-dry desulfurization system comprises a fly ash feeding device, a process hot water device, a fluidized bed desulfurization tower and a dust removal device. The fluidized bed desulfurization tower is connected with the fly ash feeding device, the process hot water device and the dust removal device, the fly ash provided by the fly ash feeding device and sulfur-containing flue gas are fed into the fluidized bed desulfurization tower and are uniformly mixed with each other, calcium oxide in the fly ash is humidified and activated by process hot water provided by the process hot water device to obtain calcium hydroxide, desulfurization reaction is carried out on the calcium hydroxide and the sulfur-containing flue gas in the fluidized bed desulfurization tower, and dust is removed by the dust removal device to obtain desulfurization ash and clean flue gas after the desulfurization reaction is carried out. The semi-dry desulfurization system has the advantages that the fly ash is directly used as a desulfurizing agent, modes for slaking quicklime to obtain slaked lime or preparing slurry from slaked lime in existing methods can be replaced, corresponding slaking devices or slurry preparing devices can be omitted, process flow can be simplified, pipelines can be prevented from being blocked, and the production cost can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a semi-dry desulfurization system and process using fly ash. Background technique [0002] my country's primary energy is mainly coal, and the pulverized coal is burned in a fluidized state in the furnace of the boiler. Most of the combustibles are burned in the furnace, and at the same time it produces SO 2 In the high-temperature flue gas such as sulfur-containing gases, some non-combustible materials are cooled by the boiler tail to form fly ash. Fly ash is the main solid waste discharged from coal-fired boilers and also exists in the high-temperature flue gas after combustion. [0003] SO 2 Such sulfur-containing gases will cause serious harm to the natural ecological environment, human health, industrial and agricultural production, buildings and materials. 2 High-temperature flue gas such as sulfur-containing gases must undergo desulfurization t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a semi-dry desulfurization system using fly ash, which is used to solve the problems of high production cost and low utilization rate of fly ash in the existing semi-dry desulfurization system

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