Method and device for removing hydrogen sulfide from coal gas to prepare sulfuric acid

Abstract

The invention discloses a method for removing hydrogen sulfide from coal gas to prepare sulfuric acid. The method comprises the following steps: processing coke oven gas and first absorbing liquid through a desulfurizing absorption tower to remove hydrogen sulfide gas so as to obtain second absorbing liquid; conveying the second absorbing liquid and intermediate-pressure steam into an absorption tower to obtain first absorbing liquid; conveying the absorbed hydrogen sulfide into an incinerator for combusting to obtain sulfur dioxide gas; decreasing the temperature of the sulfur dioxide gas, and then performing denitration; converting nitric oxide removed sulfur dioxide gas into sulfur trioxide gas through a sulfur dioxide convertor; and processing sulfur dioxide through a condensing cooling device to obtain concentrated sulfuric acid. According to the method, hydrogen sulfide gas in the coal oven gas is decreased, so that the stable production in the ammonium sulfate processing stage is ensured; the production raw materials are supplied, and self-sufficiency is ensured, so that the production cost of a company is decreased; in addition, the intermediate-pressure steam is produced through the waste heat, so that power is supplied to a supercharger of a methyl alcohol workshop of a chemical plant; and the economic benefit is high.

Description

【Technical field】 [0001] The invention belongs to the technical field of coke oven gas purification, and in particular relates to a method and a device for preparing sulfuric acid from hydrogen sulfide in gas. 【Background technique】 [0002] Coke oven gas contains 5g / m 3 If the left and right hydrogen sulfide gas is not removed, it will cause corrosion to the equipment and pipelines, affect the quality of downstream products, and cause pollution to the atmosphere. The traditional desulfurization method is the HPF method, which uses hydrogen sulfide gas to produce sulfur, and the on-site operation is intensive. The post workers need to constantly adjust the opening of the on-site heating steam valve to control the steam pressure and temperature. Basically, sulfur must be released every 2 hours, each time it needs to be released for more than 1 hour, and the pungent smell on site is relatively strong, which affects Workers are healthy and cause great pollution to the environm...

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Problems solved by technology

[0002] Coke oven gas contains 5g / m 3 If the left and right hydrogen sulfide gas is not removed, it will cause corrosion to equipment and pipelines, affect the quality of downstream products, and cause pollution to the atmosphere. The traditional desulfurization method is the HPF method, which uses hydrogen sulfide gas to produce sulfur, and the on-site operation is intensive. The post workers need to constantly adjust the opening of the on-site heating steam valve to control the steam pressure and temperature. Basically, sulfur must be released every 2 hours, each time it needs to be released for more than 1 hour, and the pungent smell on site is relatively strong, which affects Workers are healthy and cause great pollution to the environment

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