High-efficiency sulfur recovery method of waste gas containing hydrogen sulfide

Abstract

The invention discloses a high-efficiency sulfur recovery method of hydrogen sulfide containing waste gas. The high-efficiency sulfur recovery method is characterized in that the H2S containing waste gas is completely burned in an incinerator to generate SO2 gas and water vapor, then the SO2 gas and the water vapor are cooled through a waste heat boiler to generate process gas with the temperature of 300 DEG C-500 DEG C, and simultaneously, the 7.0-7.5 MPa high-pressure gas is generated; the process gas enters an oxidation reactor with a reaction section and a cooling section and is catalyzed and oxidized in the oxidation reactor to generate SO3 which is converted into sulfuric acid vapor; the sulfuric acid vapor enters a cooler and is cooled by air when the temperature of the sulfuric acid vapor is above 250 DEG C, so that sulfuric acid liquid and non-condensable gas are generated; the non-condensable gas is subjected to multistage heating, and then is subjected to secondary catalytic oxidation and secondary cooling separation, the non-condensable gas reaching the emission standards is discharged, and the sulfuric acid liquid separated out is collected. The high-efficiency sulfur recovery method has the advantages that the corrosion on production equipment can be avoided, the technology practicability is ensured, the heat is stepwise used according to the difference of liquid levels, and the utilization rate of heat is high.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method and a device for efficiently recovering waste gas containing hydrogen sulfide. Background technique [0002] In chemical fertilizer, petrochemical, natural gas, coal chemical, coking and chemical fiber industries, sulfur in raw materials is basically H 2 The form of S comes out of the system. h 2 S is a poisonous and harmful gas, which is not easy to store and cannot be discharged directly, and must be recycled. Currently recovering H 2 There are many methods for S, among which the best effect is to recover sulfur and sulfuric acid, but the recovery efficiency of these two methods is not high enough, and the exhaust gas cannot meet the new national environmental protection standard of 400mg / Nm 3 requirements. [0003] Utilize H 2 There are two methods for producing sulfuric acid from waste gas: dry method and wet method. The dry acid production ...

AI Technical Summary

Problems solved by technology

[0004] CN200680056894.X introduces a sulfuric acid manufacturing method, but what it introduces is basic common sense, which is a well-known necessary step in the sulfuric acid industry, and does not take into account the presence of SO 3 , SO 2 , sulfuric acid, water vapor and other materials cannot be used in industrial production

The method described in the specific example of this patent is theoretically feasible, but it is very difficult to find materials suitable for the working conditions described in this patent in industrial production, at least there is no relevant research and development report yet

And this patent only adds solid particles at one time before the intermediate or final condensation stage, which cannot guarantee that the acid mist in the intermediate or / and final condensation stage reaches the standard

Images