Vacuum potassium carbonate coke oven gas desulfurization-sulfuric acid preparation process and processing system thereof

Abstract

The invention discloses a vacuum potassium carbonate coke oven gas desulfurization-sulfuric acid preparation process and a processing system thereof, and relates to a process for desulfurizing coke oven gas and preparing concentrated sulfuric acid from sulfur-containing exhaust gas and a processing system thereof. Parameter control is performed at various stages of a preparation working procedure, and equipment composition in various working procedures is optimized, so that the processing efficiency can be greatly improved, the processing cost can be reduced, and the quality of products can be controlled. In the method, the coke oven gas is taken as a raw material, hydrogen sulfide-containing exhaust gas in the coke oven gas is removed, and then purified coal gas is conveyed to users, wherein the hydrogen sulfide-containing exhaust gas in the coke oven gas is removed by the following steps of: 1) separating; 2) incinerating; 3) cooling; 4) washing and purifying; 5) drying; and 6) performing double-conversion and double-absorption to obtain sulfuric acid at the concentration of more than or equal to 93 percent. The system comprises a coke oven gas desulfurization device, an incinerator, a cooling device, a washing, cooling and purification device, a drying device, a double-conversion double-absorption device, and a high-concentration sulfuric acid tank which are sequentially and mutually connected.

Description

technical field [0001] The invention belongs to a waste removal process processing system in the field of coal chemical industry, and in particular relates to a processing system for desulfurizing coke oven gas and using sulfur-containing waste gas as a raw material to prepare concentrated sulfuric acid. Background technique [0002] At present, coke oven gas mostly adopts wet desulfurization technology, which is divided into wet oxidation process and wet absorption process due to different reaction mechanisms. [0003] The wet oxidation process uses sodium or ammonia in the gas as the alkali source, uses different additives as catalysts to absorb hydrogen sulfide from the gas, and oxidizes it into elemental sulfur through the regeneration system. The biggest advantage of the process is the high desulfurization efficiency, especially suitable for the refining of high-sulfur gas (removing hydrogen sulfide in the gas to <100mg / m 3 or lower). But its disadvantage is that ...

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Problems solved by technology

But its disadvantage is that during the oxidation process, the sulfur-enriched desulfurization liquid contacts with the air, and a strong side reaction occurs, and a large amount of compounds such as thiocyanate, thiosulfate and sulfate are generated.

But its disadvantage is that compared with wet oxidation process, the desulfurization efficiency of most wet absorption processes is relatively low, and it is suitable for hydrogen sulfide content in gas after desulfurization is less than 200mg / m 3 choose when

Generally speaking, its desulfurization efficiency is low, the production cost is high, and there is no means of controlling the quality of finished products

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