Sulfur Recovery Process with Low Sulfur Emissions

Abstract

The invention provides a sulfur recovery technology realizing low sulfur emission. The sulfur recovery technology comprises a combustion 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 series or parallel, and the devices are sequentially connected in series; the total sulfur conversion factor of process effluent gas is that SO2 is smaller than or equal to 10 mg / m<3> through proper selection of various catalysts and desulfurizers and accurate control of process conditions of steps. The desulfurizers after breakthrough are subjected to in-situ thermal regeneration by inert gas at the temperature of 250-300 DEG C, regenerated outlet gas returns to the combustion furnace, a condenser I behind the combustion furnace, a condenser II behind the first-stage Claus reactor, a condenser III behind the second-stage Claus reactor, a condenser IV behind the selective hydrogenation reduction reactor or a condenser V behind the selective oxidation reactor, sulfide such as elemental sulfur, H2S,SO2 and the like in the regenerated gas is recovered, and the total sulfur conversion factor of exhaust tail gas in the regeneration period of the desulfurization towers is that SO2 is smaller than or equal to 10 mg / m<3>. The sulfur recovery technology realizing low sulfur emission has the advantages of the low sulfur emission, the long-term operation of the desulfurizers, the high desulfurization capacity, the small number of replacement times, the low expenses and the like.

Description

technical field [0001] The invention relates to a sulfur recovery process, in particular to a low sulfur emission sulfur recovery process. Background technique [0002] During petrochemical, coal chemical, and coal gasification processes, part of the sulfur contained in raw materials is usually converted into H 2 S, separated to form H 2 Acid gas with high S content, the acid gas is generally treated by sulfur recovery process, H 2 S is converted to elemental sulfur as much as possible. certain high H 2 During the purification process of natural gas with S content, the separation of H 2 The acid gas formed by S should also be converted into elemental sulfur as much as possible through the sulfur recovery process. [0003] In the operation process of the sulfur recovery unit, there are also two problems of emptying tail gas and solid waste. The tail gas evacuated through the chimney, of which, SO 2 Concentration is a continuous monitoring item, although the upper limit...

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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