Comprehensive treatment method for sulfur dioxide exhaust gas

A technology for comprehensive treatment of sulfur dioxide, which is applied in the direction of chemical instruments and methods, separation methods, halogen oxides/oxyacids, etc., can solve the problems of high sulfur dioxide content, reduce environmental impact, achieve good treatment effects, and reduce production costs. Effect

Inactive Publication Date: 2019-03-19
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the sulfur dioxide content contained in the existing sulfur dioxide waste gas is relatively high

Method used

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  • Comprehensive treatment method for sulfur dioxide exhaust gas

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Effect test

Embodiment 1

[0033] The content of sulfur dioxide in the sulfur dioxide waste gas of a sulfuric acid production plant is 0.5-5%. The sulfur dioxide waste gas is treated by gravity dust removal, and the waste gas is collected by the waste gas fan. The operating pressure is -2-0KPa, and the outlet pressure of the fan is 5-20KPa.

[0034] Under the pressure condition of 0-5kpa, the absorption tower adopts a caustic soda solution with a mass concentration of 11% to absorb sulfur dioxide waste gas, controls the pH value of the absorption end point of the lye to be 10-11, and obtains a 13% sodium sulfite solution and lye with a mass concentration. Absorbed waste gas; use sodium sulfite solution directly; pass the waste gas absorbed by lye into the waste chlorine gas system, and absorb it with caustic soda solution with a mass concentration of 17% in the absorption tower under the operating conditions of -1.5 ~ -0.5kpa. The lye absorption end point is that the effective alkali is less than 1%, and...

Embodiment 2

[0036] The content of sulfur dioxide in the sulfur dioxide exhaust gas of a sulfuric acid production plant is 0.3-5%. The sulfur dioxide exhaust gas is treated by gravity dust removal, and the exhaust gas is collected by the exhaust gas fan. The operating pressure is -1.8-0KPa, and the outlet pressure of the fan is 5-20KPa. enterprise;

[0037] Under the pressure condition of 0-5kpa in the absorption tower, the caustic soda solution with a mass concentration of 15% is used to absorb sulfur dioxide waste gas, and the pH value of the absorption end point of the lye is controlled to be 9-11, so that the sodium sulfite solution and lye with a mass concentration of 15% are obtained. Absorbed waste gas; use sodium sulfite solution directly; pass the waste gas absorbed by lye into the waste chlorine gas system, and absorb it with caustic soda solution with a mass concentration of 15% in the absorption tower under the operating condition of -1.5 ~ -0.5kpa. The end point of liquid abso...

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Abstract

The invention belongs to the technical field of sulfur dioxide exhaust gas treatment and in particular relates to a comprehensive treatment method for sulfur dioxide exhaust gas. The invention solvesthe technical problem that the sulfur dioxide content is high after sulfur dioxide exhaust gas treatment. The invention provides the comprehensive treatment method for sulfur dioxide exhaust gas. Themethod comprises the following steps: a, collecting sulfur dioxide exhaust gas of a sulfur acid plant, dedusting the sulfur dioxide exhaust gas and conveying the same to an adsorption tower, and absorbing the same with a 10-17% by mass of caustic soda solution to obtain a sodium sulfite solution and exhaust gas absorbed by alkali liquor; and b, introducing exhaust chlorine into the exhaust gas absorbed by the alkali liquor, absorbing the mixed gas with 10-17% by mass caustic soda solution, wherein the absorption end point is that the effective alkali content is smaller than 1%; and absorbing to obtain a sodium hypochlorite solution and residual exhaust gas, the content of sulfur dioxide of which is smaller than 50 ppm. By treating the sulfur dioxide exhaust gas by means of the method, thecontent of sulfur dioxide in the treated residual exhaust gas is smaller than 50 ppm.

Description

technical field [0001] The invention belongs to the technical field of sulfur dioxide waste gas treatment, and in particular relates to a comprehensive treatment method for sulfur dioxide waste gas. Background technique [0002] Sulfuric acid production enterprises use ammonia water, lime milk, etc. to absorb sulfur dioxide gas in waste gas. This type of treatment method has low sulfur dioxide absorption rate, difficult storage and use of absorption treatment liquid, and poor stability of the treatment process. At the same time, the new national regulations have strengthened the exhaust management of sulfur dioxide and further lowered the emission index of sulfur dioxide. How to deal with sulfur dioxide in exhaust gas more effectively and stably is of great significance. [0003] The free chlorine in brine and sewage of chlor-alkali chemical industry, the free chlorine in the sponge titanium production wastewater, etc. involve chlorine production enterprises. Sodium sulfite ...

Claims

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Application Information

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IPC IPC(8): C01D5/14C01B11/06B01D53/78B01D53/50
CPCB01D53/502B01D2251/304B01D2251/604C01B11/062C01D5/14
Inventor 陈映志石玉英曹旭东唐润兵张芋何山
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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