A desulfurization process and device of external circulation plus independent oxidation double alkali method

Abstract

The invention belongs to the field of atmosphere environmental protection, and particularly discloses a desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods. In the process, an out-of-tower circulation process is adopted, wherein an absorption tower is separated from a circulating pool, circulating fluid is extracted by a circulatingpump from the circulating pool which is arranged outside the tower and sprayed into the tower, and smoke rises from the inside of the tower and comes into contact with the circulating fluid to removesulfur dioxide; and the cleaned circulating fluid is drained to the circulating pool through a drainage port at the bottom of the tower, so that the whole out-of-tower circulation process is completed. The desulfurization process has high desulfurization efficiency, long stable operation time, low operation cost and high purity of product gypsum, can be used for effectively preventing the absorption tower from scaling and being blocked, and is suitable for wide popularization and application.

Description

(1) Technical field [0001] The invention belongs to the field of atmospheric environment protection, and in particular relates to a desulfurization process and device of external circulation plus independent oxidation double alkali method. (2) Background technology [0002] At present, in the desulfurization process of small and medium-sized coal-fired power plants in my country, the double-alkali desulfurization process occupies a large proportion due to its advantages of high desulfurization efficiency and low operating cost. [0003] However, through the follow-up investigation of the dual-alkali desulfurization projects in recent years, it was found that after long-term operation, fouling in the absorption tower is common in the dual-alkali desulfurization process of burning high-sulfur coals, the regeneration of sodium sulfite is unsuccessful, and the product gypsum The shortcomings of insufficient purity and poor oxidation effect lead to the production enterprises ...

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Problems solved by technology

[0003] However, through the follow-up investigation of the dual-alkali desulfurization projects in recent years, it was found that after long-term operation, fouling in the absorption tower is common in the dual-alkali desulfurization process of burning high-sulfur coals, the regeneration of sodium sulfite is unsuccessful, and the product gypsum The shortcomings of insufficient purity and poor oxidation effect lead to the production enterprises having to increase the input of sodium hydroxide in order to achieve the desired effect of desulfurization efficiency, which not only violates the original intention of the double alkali method, but also greatly increases the desulfurization operation cost

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