Method and device for decomposing dioxin in incineration flue gas by low-temperature plasma coupling catalysis

Abstract

The invention relates to a method and a device for decomposing dioxin in incineration flue gas by low-temperature plasma coupling catalysis. According to the method, a low-temperature plasma reactionunit and a catalytic reaction unit are connected in series, so that waste incineration flue gas firstly passes through the low-temperature plasma reaction unit, and dioxin in the flue gas is partiallyoxidized by strong oxidizing particles such as ozone generated by high-voltage discharge; and the dioxin enters the catalytic reaction unit, and on the surface of the catalyst, the dioxin can be thoroughly catalyzed and oxidized into small molecular substances such as carbon dioxide, water and hydrogen chloride under the condition of lower smoke temperature by virtue of strong oxidizing particlesgenerated in the low-temperature plasma reaction unit. The advantages of the low-temperature plasma and the catalyst are synergistically utilized, the treatment effect is good, secondary pollution ofozone is avoided, and industrial popularization can be carried out.

Description

technical field [0001] The invention relates to a method for purifying flue gas from a garbage incinerator, and belongs to the technical field of environmental protection. More specifically, it relates to a method that combines low-temperature plasma oxidation and catalysis generated by high-voltage discharge to efficiently decompose dioxins in waste incineration flue gas and effectively avoid secondary pollution of ozone. Background technique [0002] With the rapid development of my country's economy, the level of urbanization and the continuous improvement of people's living standards, the amount of garbage generated is increasing day by day, and the resulting pollution problems are becoming more and more serious. The harmless disposal of garbage has become an urgent problem to be solved in the field of ecological environment. At present, the main ways to deal with garbage are: landfill, incineration and composting. According to the data of the National Bureau of Statis...

AI Technical Summary

Problems solved by technology

However, the use of activated carbon to adsorb dioxins in flue gas only transfers dioxins from flue gas to activated carbon, and does not reduce the total amount of dioxins, and the activated carbon after adsorbing dioxins is hazardous waste and requires special treatment

In addition, due to the lack of engineering demonstrations, only a few manufacturers use catalytic degradation technology to deal with dioxins. Using catalysts alone has the problem of high catalytic light-off temperature, and the catalytic reaction temperature is above 200 °C

Ultraviolet photolysis, plasma decomposition and other technologies to treat dioxin are currently in the primary research stage, and the energy consumption of the plasma reactor is relatively high, and there is a relatively high concentration of residual ozone at the outlet

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