Method and device for absorbing and purifying harmful gas through electrochemical oxidation

Abstract

The invention discloses a method and a device for absorbing and purifying harmful gas through electrochemical oxidation. The method is characterized by comprising the following steps of: sucking harmful gas to be treated through a water jet vacuum device, mixing the harmful gas and absorption liquid, and introducing the mixture into an absorption tower; absorbing and degrading the harmful gas by the absorption liquid in the absorption tower, discharging the purified gas from a gas outlet on the lower part of the absorption tower, pressurizing the absorption liquid with saturation of absorption through a pressure pump, and introducing the absorption liquid into an electrochemical reactor; carrying out an electrochemical redox reaction in the electrochemical reactor, so that the absorbed harmful gas in the absorption liquid is degraded; and depressurizing the absorption liquid through the water jet vacuum device, mixing the absorption liquid and the harmful gas which is sucked by the water jet vacuum device, introducing the mixture into the absorption tower for absorption, and recycling the absorption liquid. The method has the advantages of high removal efficiency, low operating cost, low using cost and the like.

Description

technical field [0001] The invention relates to a method and device for absorbing and purifying harmful gases by electrochemical oxidation, which is used to remove gaseous harmful pollutants from the air flow, in particular to a method for removing various odorous gases from the air flow, which belongs to air pollution control and environmental protection technology field. Background technique [0002] Various malodorous gases such as volatile organic compounds such as hydrocarbons, alcohols, ethers, aldehydes, phenols, ketones, esters, nitriles, amines, and furans, and inorganic substances such as hydrogen sulfide and ammonia, are produced in chemical, pharmaceutical, painting, sewage treatment stations, etc. a production process. These pollutants are not only harmful to the human body, some are carcinogens, and a large amount of discharge has also had a serious impact on the local area environment. However, because these gases either have a relatively stable chemical str...

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Problems solved by technology

These pollutants are not only harmful to the human body, some are carcinogens, and a large amount of discharge has also had a serious impact on the local area environment.

However, because these gases have relatively stable chemical structures and are not easy to degrade, or have a low threshold, it brings great difficulties to purification treatment.

[0003] Generally, the liquid absorption method is one of the main methods to remove these harmful gases, but the main problem of this method is that the absorption capacity is limited, the absorption liquid is easily saturated, and the absorbed solution must be further processed. If it is directly sent back to the waste water pool, it will be The product after absorption treatment will volatilize again, which will lead to secondary pollution

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