Device and process for processing nitrogen-oxide waste gas containing acidic gas

Abstract

The invention relates to a device and a process for processing nitrogen-oxide waste gas containing acidic gas, which belong to the technical field of environmental protection. The device uses an alkali-liquid preparing and distributing system for distributing prepared alkali liquid into a dust-removal alkali-liquid circulation absorbing system, a first-stage alkali-liquid circulation absorbing system and a second-stage alkali-liquid circulation absorbing system, the alkali-liquid circulation in the systems use the closed-loop alkali-liquid path showering from top to bottom, the alkali liquid can be sent into a waste alkali-liquid recovery processing system, and the open-loop air path processing waste gas from bottom to top is used for processing waste gas. The process for processing nitrogen-oxide waste gas containing acidic gas is as follows: the processed waste gas respectively enters from the lower parts and exits from the upper parts of a dust-removal alkali-liquid absorbing tower, a first-stage alkali absorbing tower and a second-stage alkali absorbing tower, and the alkali liquid is showered from top to bottom. Ozone in an ozone reactor is used for oxidizing nitrogen oxide in the waste gas into nitrogen dioxide, and the processed waste gas is discharged from the discharge port of the upper part of the second-stage alkali absorbing tower. The device has simple waste gas processing technology, convenient installation, easy operation, mild reaction condition, high efficiency for removing nitrogen oxides and high automatic degree.

Description

technical field [0001] The invention relates to a nitrogen oxide waste gas treatment device and process containing acid gas, and belongs to the technical field of preventing air pollution caused by nitrogen oxides and protecting the environment. Background technique [0002] Nitrogen oxides are one of the main sources of air pollution. Commonly referred to as nitrogen oxides (NO X ) mainly includes NO, NO 2 , N 2 o 3 , N 2 O, N 2 o 5 Among them, NO and NO are the main ones that pollute the atmosphere 2 . NO X Emissions will bring serious harm to the natural environment and human production and life. [0003] With the continuous development of the economy and the continuous increase of factories, many enterprises will emit toxic nitrogen oxides during the production process. NOx treatment is a challenge, especially with high levels of NOx. At present, the methods for dealing with nitrogen oxides mainly include: reduction method and oxidation method. Among them, t...

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Problems solved by technology

Among them, the reduction method is to use various reducing gases such as H 2 , CO, NH 3 , hydrocarbons or urea react with NO to convert it into N 2 One of the disadvantages of the method is that the reducing agent is easy to leak and cause secondary pollution, and the operation cost is high

Oxidation method is to use oxidant to oxidize NO, and the resulting substance is either removed by biology or absorbed by alkali, but the technical and economic indicators and effects are not ideal

When the nitrogen oxide exhaust gas contains dust or acid gas, the above methods have certain limitations

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