Method for removing hydrogen sulfide in gas

Abstract

The invention relates to a method for removing hydrogen sulfide in gas, which belongs to the technical field of gas purification. The method is characterized in that hydrogen sulfide-containing gas is introduced into a power wave absorber to remove a lot of hydrogen sulfide, a few of hydrogen sulfide is introduced into a filled tower for fine desulphurization. According to the invention, a complexation iron absorption solution is employed, and hydrogen sulfide in gas is converted to sulfhydryl ions during an absorption process; a rich solution absorbing hydrogen sulfide converts the sulfhydryl ions to elemental sulfur which is no harm to environment through air oxidation regeneration, and the processed gas can reach the discharge requirement; the sulfur-containing gas is introduced into the power wave absorber, and is contacted with a complexation iron desulphurization solution sprayed from down to up in a counter current mode, a stable foaming layer is formed, the absorption solution is subjected to rapid rotary cutting, the gas and liquid are fully contacted, the mass transfer efficiency is obviously increased, the hydrogen sulfide gas can be rapidly absorbed, most hydrogen sulfide can be removed through power wave, and a few of hydrogen sulfide in the gas is removed through the filled tower, so that the purifying requirement can be reached.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing hydrogen sulfide from gas. Specifically, the invention is an oxidation-reduction desulfurization method combining dynamic waves and packed towers. Background technique [0002] As we all know, industrial feed gas containing hydrogen sulfide will cause corrosion of pipelines and equipment, catalyst poisoning, and affect product quality; exhaust gas containing hydrogen sulfide will cause serious environmental problems. [0003] The methods for removing hydrogen sulfide mainly include: (1) dry desulfurization, such as iron oxide method, zinc oxide method and activated carbon method. (2) Alcohol amine method. (3) Wet oxidation methods, such as ADA method, tannin extract method, MSQ method, PDS method and complex iron method, etc. (4) Physical solvent methods such as low-temperature methanol method, NHD method, etc. [0004] The wet oxidation method has...

AI Technical Summary

Problems solved by technology

[0005] With the mining of sulfur-containing oilfield gas and high-sulfur coal mines, the requirements for desulfurization are getting higher and higher; the use of amine method can basically meet the requirements of desulfurization of natural gas and refinery gas, and the Claus device is used for hydrogen sulfide content < 20t / d It cannot operate economically and reliably. The existing conventional liquid-phase redox desulfurization technology has problems such as large desulfurization device volume, large solution circulation volume, and sulfur plugging.