A kind of sulfur recovery process of Claus plus Hov tail gas treatment

Abstract

The invention relates to a sulfur recovery process by krauss and HOV (Tail Gas Hydrogenation+Direct Oxidation+High Energy Venturi Scrubbing) tail gas treatment, in particular to a sulfur recovery process which is low in energy consumption and high tail gas purification rate. The process comprises steps of second-level krauss reaction, blending at intermediate temperature, and krauss tail gas hydrogenation reduction-air direction oxidation. The sulfur recovery rate is greater than 99.7%, an oxidized tail gas is discharged into the atmosphere after being purified by virtue of wet method scrubbing, the concentration of SO2 in the tail gas is lower than 50mg / Nm<3>-dry, the washed discharged sewage can meet the direct discharge standard, the energy consumption of equipment is a negative value which is about minus 100kgEO / t of sulfur to minus 300 kgEO / t of sulfur.

Description

technical field [0001] The invention relates to a sulfur recovery process for two-stage Claus plus HOV tail gas treatment, which is used for the design of a sulfur recovery device and belongs to the field of sulfur recovery and waste gas purification. Background technique [0002] The traditional Claus process mainly consists of sulfur reactor, waste heat boiler, two-stage Claus reactor, condensing cooler, trap and other equipment. Generally, the total sulfur conversion rate of two-stage Claus reaction can reach 94~ 96%. In order to meet the environmental protection standard, the Claus tail gas must be further purified. The mainstream process currently used is the tail gas hydrogenation reduction process, and the total sulfur recovery rate can reach 99.5% to 99.8%. The process uses hydrogen to convert the non-H in the Claus tail gas 2 S sulfur compounds such as SO 2 / COS / S etc. are all hydrogenated to H 2 S, then H by methyldiethanolamine (MDEA) 2 S is absorbed and des...

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Problems solved by technology

[0003] According to the current "Comprehensive Emission Standards of Air Pollutants", the SO in the tail gas of the sulfur recovery unit 2 The emission concentration is less than 960mg / m 3 , and the upcoming "Petroleum Refining Industry Pollutant Discharge Standard" (draft for comments) stipulates that SO in the tail gas of the sulfur recovery unit 2 The emission concentration is less than 400mg / m 3 , the tail gas emission concentration in the special restricted area is less than 300mg / m 3 , which is difficult to achieve by tail gas hydrogenation reduction process. In addition, this process requires hydrogenation, amine absorption, desorption of rich amine solution, tail gas incineration and other operating processes, which consume H 2 , MDEA amine liquid, steam and fuel gas, high operating costs and high energy consumption

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