Method for desulfurizing high-concentration flue gas

Abstract

The invention discloses a method for desulfurizing high-concentration flue gas. The high-concentration flue gas is desulfurized through a sodium sulfite method, and meanwhile, the sodium sulfite is recovered as a by-product, wherein the flue gas needs to be deoxidized before being desulfurized through the sodium sulfite method. In the method for desulfurizing high-concentration flue gas disclosedby the invention, by deoxidizing the flue gas through an appropriate pretreatment process, the purity of the by-product sodium sulfite produced by the subsequent flue gas desulfurization process of the sodium sulfite method can be obviously improved, and the value of the by-product is improved, thereby obviously improving the comprehensive economic benefits. The pretreatment process of the flue gas is performed by using the sulfite and / or the hydrosulfite produced by the reaction of SO2 contained in the flue gas and alkali to react with oxygen without using any other deoxidizer. The method disclosed by the invention has simple production process and is easy to operate.

Description

technical field [0001] The invention relates to a high-concentration flue gas desulfurization method, which belongs to the field of environmental treatment methods. Background technique [0002] SO 2 It is a global air pollutant, and its main hazard is the formation of acid rain. Also, SO in the environment 2 It can lead to a decline in children's immune function, and an increase in the prevalence of respiratory and eye diseases among the general public. In the refinery, the catalytic gasoline adsorption desulfurization device is a new type of production device, which generates flue gas during the regeneration process of its adsorbent, in which the concentration of sulfur dioxide is generally 10,000-100,000 mg / m 3 , the oxygen content is generally 2000 ~ 10000mg / m 3 , must carry out flue gas desulfurization treatment. [0003] At present, the flue gas desulfurization mainly adopts dry method and wet method. Among them, the wet flue gas desulfurization technology include...

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Problems solved by technology

Although, other techniques can be used, such as precipitation, freezing, adding oxygen inhibitors, etc., as described in CN01113697.9, CN200410077339.8, etc., but due to serious shortcomings in other aspects, it cannot be used industrially

[0006] Sodium sulfite flue gas desulfurization technology is basically similar to the shortcomings of the above-mentioned sodium sulfite method. Since sodium sulfite is the target product, the sodium sulfate produced by the oxidation of sodium sulfite directly affects the quality of the by-product anhydrous sodium sulfate. At present, the sodium sulfite flue gas desulfurization technology obtains no The purity of sodium sulfite in water is only about 96%

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