Method for removing hydrogen sulfide from gas

Abstract

The invention relates to a method for removing hydrogen sulfide from gas, and belongs to the technical field of gas purification. The method mainly comprises the steps: firstly introducing the gas containing hydrogen sulfide to a kinetic wave absorber for removing a large amount of hydrogen sulfide, and then entering the gas containing a small amount of hydrogen sulfide to a filled tower for fine desulfurization; converting hydrogen sulfide in the gas into sulfhydryl radical ion in the absorption process by using a complex iron absorbing liquid; oxidizing rich solution absorbing hydrogen sulfide with air for regeneration so as to convert the sulfhydryl radical ion into simple substance sulfur harmless to environment, wherein the treated gas achieves the discharge requirement; and entering the gas containing sulfur into the kinetic wave absorber, and carrying out countercurrent contact with a complex iron desulfurizing liquid sprayed from bottom to top so as to form a stable form layer, so that the absorbing liquid carries out quick rotary cutting, and the gas and liquid are sufficiently contacted, thus the mass transfer efficiency is obviously improved, and the purification requirements that the hydrogen sulfide gas is quickly absorbed, most of hydrogen sulfide is removed by the kinetic wave, and a small amount of hydrogen sulfide in the gas is removed by the filled tower are achieved.

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...

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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.