Swirl flow strengthening method and device for purification of sulfur tail gas by Claus process

Abstract

The invention relates to a rotational flow strengthening method and device for purifying sulfur production tail gases by the Claus method, and provides a rotational flow strengthening method for purifying sulfur production tail gases by the Claus method. The method comprises the following steps of: (i) after heat exchange treatment for sulfur production tail gases by the Claus method, mixing the treated tail gases with hydrogen for hydrogenation reaction so as to reduce and hydrolyze elemental sulfur, SO2, COS and CS2 carried in tail gases to H2S; (ii) primarily cooling gases obtained in step (i) and absorbing H2S by countercurrent to remove waterdrops entrained in the gases while performing secondary cooling; (iii) absorbing H2S by countercurrent from the gases obtained in step (ii) for rotational flow separation so as to further remove H2S, and meanwhile rotationally separating amine liquid entrained; and (iv) burning the purified tail gases obtained in step (iii), and cooling to be discharged to atmosphere. The invention further provides a rotational flow strengthening device for purifying sulfur production tail gases by the Claus method.

Description

technical field [0001] The invention belongs to the field of chemical energy and environmental protection, and relates to a swirl strengthening method and device for purification of sulfur tail gas produced by the Claus method. Specifically, the present invention provides a method and device for highly efficient desulfurization of sulfur elemental substances and sulfides contained in the tail gas of sulfur production. Background technique [0002] Our country has been advocating energy conservation and emission reduction, and strictly controlling the emission of sulfur dioxide in the atmosphere. Relevant departments of the state are planning to revise the comprehensive discharge standard of air pollutants, requiring the concentration of sulfur dioxide emission from new sulfur plants to be less than 400mg / Nm 3 (Specific area emission concentration is less than 200mg / Nm 3 ). Sinopec actively implements the green and low-carbon development strategy, and regards the reduction...

AI Technical Summary

Problems solved by technology

This invention has simple process, small investment, low energy consumption and no secondary pollution, but its effect of absorbing sulfur compounds is general

[0008] From the above-mentioned Sinopec research results and literature analysis results, the concentration of sulfur dioxide emission in the flue gas of most enterprises’ sulfur plants has not yet reached the world’s advanced level (the concentration of sulfur dioxide emission is 400mg / Nm 3 ), let alone reach the world's leading level indicators (sulfur dioxide emission concentration 200mg / Nm 3 )

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