A method for desulfurization of flue gas containing low concentration sulfur dioxide

Abstract

The invention discloses a desulfurization method for fume gas containing low-concentration sulfur dioxide. The desulfurization method comprises the following steps: making zinc hypoxide powder into absorption slurry with a predetermined concentration, making the absorption slurry reversely contact the fume gas containing low-concentration sulfur dioxide in a reverse-injection material feeding pipe of a dynamic wave washing tower, conversing sulfur dioxide into zinc sulfite by utilizing the reactions between zinc oxide and sulfur dioxide, then decomposing zinc sulfite into zinc sulfate through an electrolysis waste liquid, recycling the sulfur dioxide generated by the decomposition into a sulfuric acid producing system, and finally filtering so as to obtain zinc sulfate for leaching.

Description

technical field [0001] The invention relates to the field of waste gas treatment, in particular to a desulfurization method for flue gas containing low-concentration sulfur dioxide. Background technique [0002] In the production process of the thermal power industry mainly based on olefin coal and the non-ferrous metallurgical industry using sulfide ore as raw material, a large amount of SO with low concentration and no value for acid production will inevitably be produced. 2 Exhaust gas, such SO 2 Exhaust gas is one of the most serious industrial waste gases that cause air pollution, and it is also difficult to effectively treat industrial waste gases. [0003] At present, wet industrial technologies such as lime (stone)-gypsum, sodium-alkali and ammonia absorption are mostly used in domestic industrial tail gas absorption. These methods generally have various problems: for the limestone-gypsum method, it occupies a large area and requires high equipment investment. The ...

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Problems solved by technology

[0003] At present, wet industrial technologies such as lime (stone)-gypsum, sodium-alkali and ammonia absorption are mostly used in domestic industrial tail gas absorption. These methods generally have various problems: for the limestone-gypsum method, it occupies a large area and requires high equipment investment. The circulation volume is large, the power consumption is high, the system is easy to foul and block, and the market value of the by-products is low; for the double-alkali method, the process is complicated, the operating conditions are complicated, and the by-products are pollutants; for the ammonia method, the ammonia consumption is large and the transportation of ammonia There are safety hazards in storage and storage, and the operating cost is high; for the liquid alkali method, the operating cost is extremely high; a large amount of sewage is generated; thermal desorption consumes high energy and is economically poor

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