Sulfur recovery system for acid gas and sulfur recovery method for acid gas

Abstract

The invention provides a sulfur recovery system for acid gas and a sulfur recovery method for acid gas. The sulfur recovery system for acid gas comprises a sulfur recovery unit, an incineration unit and a lime gypsum desulfurization unit; the sulfur recovery unit is used for oxidizing acid gas to obtain sulfur and recycling the recovered sulfur; the incineration unit communicates with the sulfur recovery unit and is used for incinerating the recovered sulfur to obtain sulfur-containing flue gas; and the lime gypsum desulfurization unit communicates with the incineration unit and is used for removing sulfides in the sulfur-containing flue gas. Three technologies comprising a SCOT technology (or a Claus converter technology) and incinerator primary lime gypsum desulfurization technology arecombined and used, and near zero emission of sulfides in tail gas is realized, so that the problem that sulfides in tail gas of selective catalytic oxidation of low-concentration acid gas with a hydrogen sulfide content of 5% or less is not standard is effectively solved, and a emission standard that sulfides in tail gas is less than 10 mg / m<3> can be well realized under a normal working condition.

Description

technical field [0001] The invention relates to the technical field of sulfur recovery, in particular to an acid gas sulfur recovery system and a sulfur recovery method for acid gas. Background technique [0002] At present, my country's sulfur recovery process for low-concentration acid gas with a hydrogen sulfide content of <5% cannot achieve a recovery rate of more than 98%, and the tail gas cannot achieve near-zero emissions. [0003] Clinsulf process for H 2 Gas-phase catalytic process of direct oxidation of S to elemental sulfur. Contains H 2 The S acid gas is directly heated to about 220°C, mixed with preheated air and sent to the Clinsulf reactor, where the H 2 S is directly oxidized. The oxidation reactor has a built-in cooling system, adjust the outlet temperature of the reactor slightly higher than the dew point temperature of sulfur, transfer the heat of reaction to the boiler feed water to generate medium-pressure steam, and sulfur is precipitated in the ...

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide an acid gas sulfur recovery system and an acid gas sulfur recovery method to solve the problem that the acid gas sulfur recovery process in the prior art cannot meet the environmental protection requirements

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