Method and device for recovering sulphur in acidic gas, and reactor

Abstract

The invention discloses a method for recovering sulphur in an acidic gas. The method comprises the following steps of: carrying out hydrogenating hydrolysis on organic sulphur in the acidic gas by a catalytic hydrogenation reaction to obtain an inorganic sulphide, catalytically oxidizing the inorganic sulphide to obtain sulphur, then cooling and condensing the reaction gas after the catalytic oxidation to separate liquid-state sulphur, then washing and absorbing the residual sulphide in the tail gas after sulphur separation by alcohol-containing washing solution from low-temperature methanol washing, so as to realize complete recovery for sulphur. The invention further discloses a device used for realizing the method aforementioned and a reactor. The process, device and reactor disclosed by the invention are suitable for sulphur recovery for the acidic gas with a low-concentration H2S content, and the tail gas after desulfurization is washed and treated by virtue of alcohol-containing solution in a low-temperature methanol washing process, thus reducing the content of sulphides in the tail gas and protecting environment; meanwhile, the reactor disclosed by the invention is simple and reasonable in structure, and capable of saving equipment floor space and reducing project investment.

Description

technical field [0001] The invention relates to the technical field of sulfur-containing industrial gas treatment, in particular to a method and device for recovering sulfur from acid gas, which is suitable for sulfur recovery in oil refining, coal chemical industry, petrochemical industry and natural gas processing and production. Background technique [0002] In the existing sour sulfur-containing industrial gas treatment technology, the Claus process (original Claus process) is commonly used, and the reaction is as follows: [0003] [0004] In order to control the reaction temperature, this process can only be carried out at a very low space velocity, which is difficult to use in large-scale industrial devices. Later, an improved Claus process appeared, and the H 2 S oxidation is carried out in two stages, and the reaction is as follows: [0005] [0006] [0007] It can be seen from the above reaction formula that only H is reacted in the first step 2 1 / 3 of ...

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Problems solved by technology

Since the industrialization of the Claus recovery process in the 1930s, it has been widely used in the processing of coal, oil, and natural gas such as synthetic ammonia and methanol raw gas production, refinery gas production, and natural gas purification. It has the ability to directly process H 2 S generates sulfur and saves SO compared with acid production 2 Pipeline transportation cost and acid desulfurization cost, high safety and other advantages, but with acid recovery H 2 Compared with S, the one-time investment cost is high

[0008] Acid gas H treated by conventional improved Claus sulfur recovery process 2 The lower limit of S concentration is 15-20%. However, the composition of acid gas in my country's coal chemical industry is complex, and it often comes directly from synthesis gas purification such as low-temperature methanol washing. Therefore, the sulfur content is generally low (≤15%), and the concentration fluctuates greatly (7-15%). 20%), these two characteristics cause the combustion furnace in the main reaction section of the existing coal chemical acid gas Claus sulfur recovery device to fail to operate normally, and it is difficult to obtain quantitative SO 2 Guarantee the H required by the Claus reaction in the conversion section 2 S / SO 2 = 2:1 ratio, resulting in exhaust gas exceeding the standard, and the entire sulfur recovery unit cannot operate

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