The invention discloses a method for preparing
sulfur dioxide by utilizing the by-product of a coking industry desulfurization
system, and relates to the technical field of
sulfur dioxide production methods. According to the method, liquid-state
sulfur from a sulfur melting
system passes through a liquid-state sulfur conveying pipeline, and is subjected to flow rate adjusting through a liquid-state sulfur flow
rate control device, and the flow rate-adjusted liquid-state sulfur enters an incinerator through a liquid-state sulfur inlet; a liquid-state by-product salt from a salt extraction
system passes through a liquid-state by-product salt conveying pipeline, and is subjected to flow rate adjusting through a liquid-state by-product salt flow
rate control device, and the flow rate-adjustedliquid-state by-product salt enters the incinerator through a liquid-state by-product salt inlet; external
oxygen is subjected to flow rate adjusting through an
oxygen flow
rate control device, and the flow rate-adjusted external
oxygen enters the incinerator through an oxygen inlet; and the liquid-state sulfur, the liquid-state by-product salt and the external oxygen are subjected to a combustionreaction at a certain temperature in the incinerator, and the generated
sulfur dioxide gas is exported through a generated gas outlet. According to the present invention, with the application of themethod to prepare
sulfur dioxide, the reactant liquid-state sulfur does not substantially contain water, and the
water content of the liquid-state by-product salt is low, such that the generated
sulfur dioxide gas has the low
water content, and a large amount of dilute
sulfuric acid cannot be generated in the acid preparation process of the subsequent system so as to solve the
disadvantage of theexisting desulfurization waste liquid-to-acid process.