System and method for regenerating magnesium oxides and sulfur dioxides through decomposition of magnesium oxide desulphurization by-products

Abstract

The invention discloses a system and a method for regenerating magnesium oxides and sulfur dioxides through the decomposition of magnesium oxide desulphurization by-products. The system mainly comprises a vertical cylindrical regenerative furnace, an air preheater, a by-product drying machine, a two-stage solid particle separator, a fan, a connecting pipeline and a regulating valve, wherein the vertical cylindrical regenerative furnace is provided with a middle conical section, the air preheater and the by-product drying machine carry out heating by using the waste heat of high-temperature furnace gas; hot air is injected in the regenerative furnace from the lower part of the regenerative furnace, dried desulphurization by-products and fuels are injected in the regenerative furnace from a hearth, a gas-solid two-phase reaction is performed in a furnace body space of the regenerative furnace, and the adding amounts and temperature of by-products, fuels and air, the excess oxygen content and the residence time are designed and controlled through a proper process and a proper system. According to the invention, an effect of reaching a magnesium sulfite decomposition rate of more than 99.5% is guaranteed under the conditions of high productivity and low energy consumption, high-activity magnesium oxides for circulating desulfurization and high-concentration sulfur dioxide gas products are obtained, and the system and method disclosed by the invention have an extensive adaptive capacity to the characteristics of fuels and by-products, therefore, the system and method disclosed by the invention have the reality, universality and economy of industrial applications.

Description

technical field [0001] The patent of the present invention relates to a system and method for regenerating desulfurization agent from exhaust gas desulfurization by-products and recovering sulfur resources, in particular to a system and method for thermally decomposing magnesium oxide desulfurization by-products magnesium sulfite and magnesium sulfate to regenerate magnesium oxide for desulfurization Systems and methods for the simultaneous production of sulfur dioxide. Background technique [0002] Fossil fuels, especially the sulfur contained in coal and oil, produce sulfur dioxide gas after combustion, which is discharged with the exhaust gas of combustion products, causing air pollution. Various flue gas desulfurization processes implemented to control the pollution of sulfur dioxide in the exhaust gas to the atmosphere use desulfurization absorbents to absorb sulfur dioxide gas in the exhaust gas to produce harmless desulfurization by-products to achieve the purpose of ...

AI Technical Summary

Problems solved by technology

In all these traditional exhaust gas desulfurization processes, the desulfurizer is consumed once after the absorption of sulfur dioxide gas to produce harmless neutral sulfite and sulfate, thus greatly increasing the desulfurization operating cost; while the fuel in The sulfur resources are not recovered after being converted into desulfurization by-products, resulting in a great waste of resources

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