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.

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