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Recovery processing method for low-concentration stray smoke S02

A recycling, low-concentration technology, applied in the fields of chemical and metallurgical engineering, can solve problems such as low absorption efficiency, environmental pollution, and excessive discharge, and achieve the effects of high absorption efficiency, reduction of environmental pollution, and effective recovery and treatment.

Inactive Publication Date: 2012-08-22
JINCHUAN GROUP LIMITED
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  • Claims
  • Application Information

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Problems solved by technology

However, most of them have low absorption efficiency, resulting in excessive discharge and environmental pollution.

Method used

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  • Recovery processing method for low-concentration stray smoke S02

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Embodiment Construction

[0012] A low-concentration stray flue gas SO 2 Recycling method, the concrete steps of the method are:

[0013] (1) The low-concentration flue gas enters the bottom of the absorption tower after being cooled, and is in countercurrent contact with the lean liquid sprayed down from the top to complete the absorption process to the maximum extent. 2 The tail gas of the flue gas is tested and then vented. At this time, the S0 in the tail gas 2 The volume fraction does not exceed 0.05%;

[0014] (2) The absorption liquid in (1) enters the rich liquid tank, and the rich liquid and water vapor are countercurrently contacted in the desorption tower, and the water vapor passing through the condenser is condensed, and S0 with a volume fraction of more than 90% is separated. 2 gas;

[0015] (3) Most of the S0 is removed from the absorption liquid 2 After becoming poor liquid, it enters the absorption tower for recycling. That is, the absorption liquid circulates between th...

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Abstract

The invention relates to a recovery processing method for low-concentration stray smoke S02 difficult to process, which comprises the following specific steps: (1) after low-concentration smoke is cooled, the low-concentration smoke enters the bottom of an absorption tower to carry out countercurrent contact with barren liquor which is sprayed from the top; (2) the absorption liquor in step (1) enters a rich liquor tank, rich liquor carries out countercurrent contact with steam in a desorption tower to separate S02 gas of which the volume fraction is more than 90%; (3) after S02 is separated from the absorption liquor, the absorption liquor becomes barren liquor, and the barren liquor is recycled in the adsorption tower; and (4) a barren liquor tank and the rick liquor tank are combined into a whole, the barren liquor is repeatedly adsorbed until a desorption volume fraction is achieved, adsorption is stopped, the desorption tower is started, the the desorption process lasts until the S02 volume fraction in the adsorption liquor is lowered to a set volume fraction, and the process is circulated. The recovery processing method for the low-concentration stray smoke S02 is economic and practical and has a good adsorption effect, and the smoke S02 with the low volume fraction is effectively recovered so as to reduce pollution on the environment.

Description

technical field [0001] The invention relates to the technical field of metallurgical engineering and the technical field of chemical industry, in particular to a low-concentration refractory stray flue gas S0 2 recycling method. Background technique [0002] With the S0 produced in the smelting process of non-ferrous metals such as nickel and copper, 2 The flue gas has been increasing year by year, and has become a serious local pollution source, and the emission has already exceeded its environmental capacity. At the same time, my country's sulfur resources are insufficient, so in the treatment of S0 2 Recovering sulfur resources while polluting is not only of theoretical significance, but also of practical significance. Some non-ferrous metal companies recycle S0 in smelting flue gas by establishing sulfuric acid and sodium sulfite production systems 2 , the research shows that the S0 of the flue gas of acid making 2 The volume fraction should be controlled at 5% to 9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 刘玉强刘世和曹伟刘爱春范国锋
Owner JINCHUAN GROUP LIMITED
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