Photocatalysis reactor for degrading dioxins in flue gas and method for activating photocatalyst

Abstract

The invention relates to a technique for controlling dioxin discharge in the process of processing solid wastes by a burning method, and aims to provide a photocatalytic reactor for degrading dioxin in flue gas and a photocatalyst activating method. The reactor is a light transparent container and the inside of the reactor is provided with a porous medium which is loaded with the photocatalyst. The method for activating the photocatalyst comprises the following steps: irradiating a deactivated photocatalyst by light in the presence of N2 gas; irradiating the photocatalyst by the light in the presence of O2; and washing the photocatalyst with clear water to recover the activity for standby. Compared with the prior process, the photocatalytic reactor and the photocatalyst activating method are more economical, and process the dioxide in the flue gas more thoroughly.

Description

Technical field [0001] The invention relates to a technology for controlling dioxin emission in the process of disposing of solid waste by incineration, in particular to a photocatalytic reactor and a photocatalyst activation method for degrading dioxin in flue gas. Background technique [0002] In the context of the rapid development of my country's national economy and the continuous improvement of people's material living standards, the amount of industrial waste and municipal solid waste is also rapidly increasing. Compared with other garbage disposal methods, the incineration method can better achieve the goal of "reduction, resource utilization and harmlessness", and it is widely used at home and abroad. Many cities in my country have also established large-scale waste incineration plants. Toxic substances are produced during the incineration process. Among them, dioxins are the most toxic. They are difficult to degrade after being discharged into the environment. They are...

AI Technical Summary

Problems solved by technology

But there are two main defects in this method: the one, this method itself can not reduce the total amount of dioxin, only the dioxin in the gas phase is transferred to the solid phase by the adsorption of activated carbon and then collected, and the produced dioxin mixed with activated carbon Fly ash is enriched with high concentration of dioxins, which is very harmful to the environment. At present, there is no good way to dispose of fly ash from waste incineration. Domestically, landfill is mainly used to dispose of this kind of fly ash, which is harmful to the environment. The potential harm is very great; the second is that this method needs to consume a large amount of activated carbon, and the operating cost is relatively high

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