Sulfur tail gas purifying device and technology

Abstract

The invention relates to a sulfur tail gas purifying device and technology and belongs to the technical field of sulfur containing tail gas treatment. The device comprises a quenching tower, an absorption tower, a regeneration tower, a cooler and a circulation pump. Ammonia containing acidic gas generated by a sour water stripping device is applied to a CLAUS sulfur tail gas treating process, anda byproduct after treatment is returned to a sulfur making process. The sulfur tail gas purifying device disclosed by the invention has the advantages of high material safety, short technological process, low absorption temperature and ability in avoiding ammonia escape; discharged gas SO2 can be reduced to 50mg / Nm<3> or lower; meanwhile, the ammonia containing acidic gas of the sour water stripping device of an oil refinery is utilized as an ammonia source in an absorption process, absorption liquid is returned to the sulfur making process, and the materials can be comprehensively utilized.

Description

technical field [0001] The invention relates to a sulfur tail gas purification device and process, belonging to the technical field of sulfur tail gas treatment. Background technique [0002] The prevention and control of air pollution has always been an important field of environmental protection. my country has always advocated energy conservation and emission reduction, and strictly controlled the total amount of sulfur dioxide emissions in the atmosphere. Will SO 2 Emission limit lowered to 400mg / Nm 3 (Special area 100mg / Nm 3 ). The traditional sulfur recovery process technology can no longer meet the requirements, and the existing CLAUS sulfur tail gas needs to be thoroughly purified before being discharged up to the standard. [0003] At present, the domestic CLAUS sulfur tail gas treatment methods mainly include low-temperature Claus method, selective oxidation method, reduction-absorption method and oxidation-absorption method. Among them, the low-temperature Clau...

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Problems solved by technology

The traditional sulfur recovery process technology can no longer meet the requirements, and the existing CLAUS sulfur tail gas needs to be deeply purified before being discharged up to the standard

[0003] At present, the domestic CLAUS sulfur tail gas treatment methods mainly include low-temperature Claus method, selective oxidation method, reduction-absorption method and oxidation-absorption method. Among them, the low-temperature Claus method, selective oxidation method, and reduction-absorption method have a long process flow and require device safety control. High, and the tail gas treatment effect cannot meet the further improvement of environmental protection requirements

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