Method and apparatus for removing sulfur dioxide from sulfuric acid industrial tail gas, and for recovering sulfuric acid

Abstract

The invention relates to the methods and apparatuses for treating sulfuric acid industrial tail gas, and discloses a method and an apparatus for removing sulfur dioxide from sulfuric acid industrial tail gas, and for recovering sulfuric acid. The method comprises the steps that: sulfur dioxide in flowing sulfuric acid industrial tail gas is removed in an absorption tower by using a hydrogen peroxide solution, and sulfuric acid is recovered. The apparatus comprises an absorption tower, a spraying apparatus and a demister. The spraying apparatus comprises a circulating pump, a metering pump, a hydrogen peroxide storing tank and a sprayer. The absorption tower is provided with a gas inlet and a gas outlet. The following components are sequentially arranged in the absorption tower from bottom to top: a collecting tank, a gas distributing plate, a diluted-acid-resisting filling material, the sprayer, and the demister. A circulating port and a liquid discharging port are arranged on the bottom of the collecting tank. The circulating port communicates with the sprayer through the circulating pump. A valve is arranged on the liquid discharging port. The hydrogen peroxide storing tank communicates with a liquid inlet port of the circulating pump through the metering pump. According to the invention, effect for removing sulfur dioxide from sulfuric acid industrial tail gas is good, sulfur can be recovered and reused, production cost of sulfuric acid is reduced, and secondary pollution is avoided. The apparatus has advantages of simple structure, easy operation, low investment and low operation cost.

Description

technical field [0001] The invention relates to a method and a device for treating tail gas in the sulfuric acid industry, in particular to a method and a device for removing sulfur dioxide in the tail gas of the sulfuric acid industry and recovering sulfuric acid. Background technique [0002] my country's sulfuric acid industry annual SO 2 The emission is about 100,000 tons, accounting for the national SO 2 0.4% of emissions, accounting for chemical industry SO 2 9.0% of the total emissions, is the largest SO in the chemical industry 2 Emission source. GB 26132-2010 "Sulfuric Acid Industrial Pollutant Discharge Standard" was officially implemented on March 1, 2011. There are stricter regulations on sulfur dioxide emission in the sulfuric acid industry. Due to the limitation of the conversion rate of the device and the high content of sulfur dioxide in the tail gas, it is difficult to meet the requirements of the standard. For this reason, tail gas treatment devices m...

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Problems solved by technology

GB 26132-2010 "Discharge Standard of Pollutants for Sulfuric Acid Industry" was officially implemented on March 1, 2011. There are stricter regulations on the emission of sulfur dioxide in the sulfuric acid industry. The conversion rate of the device is limited, and the content of sulfur dioxide in the tail gas is high, so it is difficult to meet the requirements of the standard

For this reason, tail gas treatment devices must be added. At present, ammonia method, organic amine method, sodium citrate method, alkali method, etc. are mainly used for sulfuric acid industrial tail gas treatment. The above methods have poor removal effect on sulfur dioxide in sulfuric acid industrial tail gas, and the desulfurization rate is low

The equipment structure for realizing these methods is complex, and there are problems such as large investment and high operating costs. The existence of these problems makes it encounter great obstacles in the promotion of sulfuric acid industry

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