Low sulfur emission sulphur recovery process

Abstract

The present invention provides a low sulfur emission sulphur recovery process, which comprises a burning furnace, a first stage Claus reactor, a second stage Claus reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor, and two adsorption desulfurization towers capable of being connected in a series parallel connection manner, wherein the burning furnace, the first stage Claus reactor and the second stage Claus reactor are sequentially connected in series. According to the present invention, with the appropriate selection of each catalyst, the appropriate selection of the desulfurization agent, and the accurate control of each step process condition, the total standard sulfur in the process emission gas is that SO2 is less than or equal to 10 mg / m<3>; after the desulfurization agent penetrates, 250-300 DEG C inert gas is used to perform in-situ thermal regeneration, the regeneration outlet gas returns to the burning furnace, the condenser after the burning furnace, the condenser after the first stage Claus reactor, the condenser after the second stage Claus reactor, the condenser after the selective hydrogenation reduction reactor, or the condenser after the selective oxidation reactor to recover elemental sulfur, H2S, SO2 and other sulfides in the regeneration gas, and the total standard sulfur in the evacuation tail gas during the desulfurization tower regeneration process is that SO2 is less than or equal to 10 mg / m<3>; and the low sulfur emission sulphur recovery process has advantages of low sulfur emission, long desulfurization agent operating, high desulfurization capacity, less replacement frequency, low cost and the like.

Description

Technical field [0001] The invention relates to a sulfur recovery process, in particular to a sulfur recovery process with low sulfur emissions. Background technique [0002] In petrochemical, coal chemical, and coal gasification processes, part of the sulfur contained in the raw materials is usually converted into H 2 S, form H after separation 2 The acid gas with high content of S is generally treated by sulfur recovery process, and the H 2 S is converted into elemental sulfur as much as possible. Some high H 2 In the purification process of natural gas with S content, separate H 2 The acid gas formed by S must be converted into elemental sulfur as much as possible through the sulfur recovery process. [0003] During the operation of the sulfur recovery device, there are two problems of exhausting tail gas and solid waste. Exhaust gas evacuated through the chimney, of which SO 2 The concentration is a continuous monitoring item, although the upper limit of the current comprehens...

AI Technical Summary

Problems solved by technology

[0011] C. Multiple replacements of catalytic oxidation adsorption desulfurizers in the process bring more hidden dangers of safety and environmental pollution

[0012] After the catalytic oxidation adsorption desulfurizer loaded in the adsorption desulfurization tower is saturated or penetrated, it needs to be unloaded and replaced with a new catalytic oxidation adsorption desulfurizer, so there is a problem of regular replacement of the catalyst frequently; when the agent is unloaded, the upper desulfurizer bed The layer often has agglomeration, which is difficult to unload, and the H physically adsorbed in the upper desulfurizer bed 2 S is emitted, there is an obvious odor, and the environment of the unloading site is poor. If proper treatment is not carried out, H will still be emitted during storage and transportation. 2 S, SO 2 odor, pollute the environment, and also affect the safety of operators; the unloaded waste desulfurizer contains more than 20% (mass) of sulfur, and there is a danger of flammability during storage and transportation, and SO 2 It will also cause environmental pollution; in the process of waste agent treatment, the processing factory is often small in scale and limited in facilities, which is likely to cause serious environmental pollution, and the sulfur contained in the waste agent cannot be effectively utilized.

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