Desulfurization process method combining dry oxidation and wet oxidation

Abstract

The invention discloses a desulfurization process method combining dry oxidation and wet oxidation. Hydrogen sulfide is converted into sulfur through combination of a dry selective oxidation method and a wet oxidation method, an ultra-low emission combined process is achieved, and a used catalyst and a reaction process are included. The catalyst and the reaction process method can be used for sulfur recovery and acid gas treatment in the industries of petroleum refining, natural gas purification, coal chemical industry and the like. Acid gas containing hydrogen sulfide is firstly subjected toa dry selective oxidation process, 90% or more of sulfur is recovered in the form of sulfur, and the rest is treated by a wet oxidation process, so that the tail gas can meet the ultra-low emission requirement, the consumption of a catalyst and an alkali source in the traditional wet oxidation process can be reduced, and the generation of a byproduct sulfur cake is reduced.

Description

technical field [0001] The invention belongs to the technical field of desulfurization, and more specifically, relates to a joint process of converting hydrogen sulfide into sulfur by combining dry selective oxidation and wet oxidation to achieve ultra-low emissions, including the catalyst used and the reaction process, the catalyst And the reaction process method can be used for sulfur recovery in industries such as petroleum refining, natural gas purification and coal chemical industry. Background technique [0002] In the sulfur recovery process, the high hydrogen sulfide in the industrial gas can be recovered by using the Claus and selective oxidation process, and high-quality sulfur can be obtained, but the exhaust gas usually cannot meet the standard. Claus and its derivative processes usually require an incinerator and caustic washing at the end to meet the increasingly stringent emission requirements, while another dry selective oxidation process requires the tail ga...

AI Technical Summary

Problems solved by technology

[0003] Wet oxidative desulfurization technology has achieved a lot of results in hydrogen sulfide conversion and ultra-clean emissions, such as the LO-CAT process developed by Clean Air Systems in the United States. Chinese patent CN105233649A describes a method that uses complex iron as the main component. Wet desulfurization catalyst, this catalyst has simple desulfurization process and high desulfurization efficiency, but has the disadvantages of slow regeneration rate, large size of regeneration equipment, high amount of regeneration air, high power consumption of fans during regeneration, and the quality of sulfur products from the regeneration system Poor, the disadvantage of being difficult to sell externally

At the same time, the catalyst cost of the wet oxidation process is affected by the hydrogen sulfide flow rate, and the large amount of total sulfur will directly lead to high operating costs, which will affect the use of the wet oxidation process

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