Electrochemical recycling method and electrochemical recycling device for claus tower tail gas by cooperating with absorption liquid

Abstract

The invention relates to an electrochemical recycling method and an electrochemical recycling device for claus tower tail gas by cooperating with absorption liquid. According to the technical solution, the cooperated absorption liquid inside a liquid storage tank (9) subjected to absorption reaction of claus tail gas enters an inner rotational flow type electrochemical reactor from a liquid inlet (11) through an infusion pump (8), and a reaction product, namely elemental sulfur, is discharged to a sulfur collecting tank (7) after being collected by a sulfur separator (6) at the bottom of the inner rotational flow type electrochemical reactor and discharged to a buffer tank (10) from an overflow pipe (2) at the top of the inner rotational flow type electrochemical reactor after being oxidized by a barrel type electrode (4). Then, the cooperated absorption liquid subjected to electrode oxidation discharged into the buffer tank (10) is regulated at 20-90 DEG C, the chemical components of the cooperated absorption liquid subjected to regulation are the same as those of the cooperated absorption liquid before the absorption reaction of claus tail gas so as to be recycled for the absorption reaction of claus tail gas. The electrochemical recycling method and the electrochemical recycling device have the advantages of low operating cost, convenience in operation, high sulfur recovery rate, few byproducts, long service life of device and suitability for industrial application.

Description

technical field [0001] The invention relates to the technical field of Clausta tail gas treatment, in particular to a method and device for electrochemical cycle regeneration of Clausta tail gas combined with absorption liquid. Background technique [0002] As the country's control over the sulfur content of fuel oil is becoming increasingly stringent, effective treatment of H produced in the petroleum refining process 2 S and other sulfur-containing tail gases have attracted more and more attention. H produced during petroleum refining 2 S and other sulfur-containing tail gas is highly toxic. Although it is treated by the Claus desulfurization process, the treated tail gas still contains a certain concentration of H 2 S and other sulfur-containing gases, if they are directly discharged into the air without further treatment, will cause a serious decline in the quality of the atmospheric environment. [0003] H produced by catalytic cracking and hydrogenation processes in...

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Problems solved by technology

However, the cyclic process of the CANSOLV process is to realize the recycling of the amine liquid by heating the rich amine liquid. Therefore, the CANSOLV process is complicated to operate, high in operating costs, and severely corroded, and it is difficult to prevent oxygen from entering the amine through the lye during the heating process. liquid, causing the amine liquid to oxidize and degrade again and deteriorate

[0005] In the research on the biological method of regenerating iron salt combined with the absorption solution, the domestication of Thiobacillus ferrooxidans in the early stage of the regeneration reaction, the cultivation and film-hanging operation conditions are harsh and complicated, and the air flow during the regeneration reaction will also cause the film-hanging to fall off. The sulfur generated by the regeneration reaction is mixed with iron ions, which not only affects the desulfurization efficiency, but also leads to the low purity of the generated sulfur product

In addition, in order to ensure the biological activity of Thiobacillus ferrooxidans, trace elements such as N, P and K need to be supplemented regularly during continuous operation, and Fe 2+ solution and adjust the pH to ensure the balance of the regeneration reaction. Therefore, the entire process takes a long time and is cumbersome. The regenerated iron salt absorption solution is doped with other elements, causing secondary pollution, and is not suitable for industrial production.

[0006] Although the method of atmospheric air oxidation to regenerate the iron salt absorption liquid is simple to operate, the solubility of oxygen is limited, which also limits the regeneration efficiency to a certain extent.

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