Refining thiol tail gas governance problems broken
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The mercaptan tail gas discharged from a gasoline oxidation sweetening and alcohol treatment device of a refinery mainly contains harmful substances such as hydrocarbons, hydrogen sulfide, mercaptan, and thioether, and direct discharge not only wastes a large amount of resources, but also causes serious pollution to the environment. To completely solve this problem, the Fushun Research Institute of Petroleum and Chemical Industry and the Shuozhou Branch jointly developed the gasoline oxidation sulfenyl alcohol tail gas regenerative combustion combustion processing technology, and used this technology to build the first domestic gasoline oxidation sulfoxide tail gas industrial demonstration device. .
According to reports, the technology has developed a two-stage process technology for the treatment of gasoline oxidation of the tail gas from the oxidation of methanol. Most of the hydrocarbons in the exhaust gas are recovered through the first-stage condensation treatment, and the exhaust gas passes through the regenerative thermal oxidation treatment to meet the emission standards. This technology solves the problem of condensation recovery of liquid hydrocarbons in the exhaust gas and the problem of regenerative thermal oxidation treatment of the exhaust gas, which enables the device to achieve a high level of automatic control and effectively solves the problem of the recovery and use of hydrocarbons in the gasoline oxidation of sulferic acid off-gases from refineries. Meet the standard emission problem.
In January 2008, the gasoline thermal oxidation sweetening gas exhaust gas regenerative combustion treatment complete set of technology was successfully applied to the gasoline oxidation sweetened alcohol tail gas treatment device of the Zhangzhou Branch. The results of industrial tests show that the waste gas can be recovered from 80% to 90% of the hydrocarbons through the preceding condensation recovery process, and 200 to 400 tons of liquid hydrocarbons can be recovered each year. After the condensate is treated, the tail gas is diluted into the rear stage heat storage combustion system and subjected to high temperature oxidation treatment at 650°C to 850°C. The pollutant removal rate can reach 95% to 98%. After the first stage condensing and the latter stage heat storage combustion, the total pollutant removal rate can reach 99%, and the exhaust gas can meet the discharge standards.
The successful development of this technology has created favorable conditions for the popularization and application of heat recovery thermal oxidation treatment technology for high concentration hydrocarbon-containing waste gas condensate recovery and low-concentration hydrocarbon-containing waste gas. At present, refineries in Tianjin and Nanjing are preparing to use this technology for the treatment of oily sewage tanks and for the treatment of gasoline oxidation sweetening.