Electrolysis circulating flue gas desulfurization method utilizing reclamation semidry method

Abstract

The invention relates to the technical field of chemical industry, in particular to an electrolysis circulating flue gas desulfurization method utilizing reclamation semidry method, wherein the desulfurization method provided by the invention is a desulfuration technique which is low in investment and operating cost and free from secondary pollution. In the technique, sodium hydroxide is utilizedas a desulfurizing agent, the semidry method is adopted for desulfurating waste gas and an electrochemical method is utilized to lead sodium sulfate which is a regenerated desulfurization product to generate the sodium hydroxide and high-purity sulfuric acid, wherein the sodium hydroxide is taken as the desulfurizing agent, and the sulfuric acid is sold as goods. The electrolysis circulating fluegas desulfurization method provided by the invention has the positive effects that the sulfur dioxide in the waste gas can be effectively removed; compared with a wet method, a desulfuration device is smaller, the investment is less, the cost is lower, the energy consumption of desulfuration can be reduced, and a great deal of desulfuration waste water and waste residue can not be generated; and compared with a dry method, the reaction speed is rapider, the desulfuration rate is higher, the requirement of industrialized application can be met, and the sulfur dioxide in flue gas is effectivelyrecycled.

Description

【Technical field】 [0001] The invention relates to the technical field of chemical industry, and is a method for removing sulfur dioxide (SO 2 ) in exhaust gas. 2 ) method, in particular to a method for utilizing semi-dry desulfurization product electrolytic recycling and recycling. 【technical background】 [0002] Sulfur dioxide (SO 2 ) emissions will cause air pollution, lead to frequent ecological disasters such as acid rain, and have a serious impact on social development, economic construction and people's lives. In recent years, this issue has attracted worldwide attention, and the control of sulfur dioxide emissions has become a common behavior of the world. The "Air Pollution Prevention and Control Law" promulgated by China in 2004 clearly stated the goal of "maintaining national ecological and environmental security", and raised the control of air pollution to a strategic level. The "National Environmental Protection "Eleventh Five-Year" Plan" promulgated by the St...

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Problems solved by technology

[0004] (1) Commonly used wet flue gas desulfurization technologies include limestone-gypsum method, indirect limestone-gypsum method, lemon absorption method, etc., which are gas-liquid reactions with fast reaction speed, high desulfurization efficiency, mature technology and wide application , accounting for more than 80% of the total installed capacity of desulfurization; however, the wet method has high energy consumption, large floor space, high investment and operating costs, and produces difficult-to-handle sludge

[0005] (2) Dry method Commonly used dry flue gas desulfurization technologies include activated carbon adsorption method, electron beam radiation method, charged dry absorbent injection method, metal oxide desulfurization method, etc., which have the advantages of simple equipment, small footprint and low investment. It has the advantages of low operating cost, convenient operation, low energy consumption, easy disposal of products, and no need for sewage treatment system; however, its disadvantages are: slow reaction speed and low desulfurization rate

However, because the price of desulfurizer is much higher than that of limestone-gypsum, at present, the semi-dry method using sodium hydroxide (NaOH) as desulfurizer has not yet been applied industrially

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