Sulfuric acid tail gas and waste gas combined acid making method and device

Abstract

The invention relates to a sulfuric acid tail gas and waste gas combined acid making method. The sulfuric acid tail gas and waste gas combined acid making method comprises the following steps: (a) introducing air into sulfuric acid tail gas to obtain mixed gas; (b) mixing and incinerating the mixed gas in the step (a) and hydrogen sulfide; and (c) using obtained incinerated gas for acid making. According to the invention, sulfuric acid tail gas can be recycled for acid preparation through mixed acid preparation, the method is different from the traditional spray absorption process, and has more advantages in environmental protection and safety; meanwhile, sulfuric acid tail gas and hydrogen sulfide are mixed for combustion, the concentration of sulfur dioxide gas after combustion of hydrogen sulfide can be stabilized, subsequent conversion reaction is facilitated, and system production tends to be stable.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method and a device for combining sulfuric acid tail gas and waste gas to produce acid. Background technique [0002] At the current stage, the most important processes for the treatment of sulfuric acid tail gas in the sulfuric acid manufacturing process are alkali spray method, hydrogen peroxide spray method, ammonia water spray method, etc. Mainly when acid-base neutralization or oxidation occurs, a new substance is regenerated while sulfuric acid tail gas is being treated, and most of the raw materials used are hazardous chemicals, which increases safety risks. During the spraying process, the exhaust gas concentration is affected by many factors, which is not conducive to environmental protection control. [0003] Sulfuric acid tail gas, its components are sulfur dioxide, sulfur trioxide, nitrogen and sulfuric acid mist, if it is returned to the system al...

AI Technical Summary

Problems solved by technology

Due to the use of spraying, the raw materials used are all hazardous chemicals, which increases the risk of handling

[0004] However, in the prior art, hydrogen sulfide is incinerated alone to make acid, and the ratio of hydrogen sulfide to air in the incinerator fluctuates due to the fluctuation of hydrogen sulfide concentration. In the case of complete combustion and incomplete combustion of hydrogen sulfide, it is easy to generate sublimated sulfur to block the system.

At the same time, the fluctuation of gas concentration caused by the fluctuation of hydrogen sulfide will affect the subsequent conversion

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