Method and device for achieving in-situ activation of SCR catalyst by utilizing ozone

Abstract

The invention discloses a method and device for achieving in-situ activation of an SCR catalyst by utilizing ozone. The method comprises the steps of generating an active oxygen species with strong oxidizability on the surface of the SCR catalyst by utilizing ozone, resisting poisoning of the SCR catalyst and achieving in-situ activation and regeneration of the SCR catalyst, wherein the SCR catalyst is a MnOx and CuO co-modified SCR catalyst. The device comprises an SCR catalytic reaction device for flue gas purification and an ozone activation device for in-situ activation of the SCR catalyst, wherein the SCR catalytic reaction device comprises a flue gas inlet, a flue gas inlet pipeline, an SCR catalyst bed, a flue gas outlet pipeline and a flue gas outlet; the ozone activation device comprises an ozone generator, a second control valve, a second ozone pipeline and a second ozone injection port; the second ozone injection port is arranged within the SCR catalyst bed. By adopting themethod and the device, low-concentration ozone is combined with the SCR catalyst after MnOx and CuO are codoped, so that the activity of the SCR catalyst is improved, the poisoning of the SCR catalystis prevented, and the in-situ activation regeneration of the SCR catalyst is achieved.

Description

technical field [0001] The invention belongs to the technical field of SCR flue gas denitrification, and relates to a method and a device for realizing in-situ activation of an SCR catalyst by utilizing ozone. Background technique [0002] As the most effective means of waste disposal in China, waste incineration technology can not only completely and harmlessly dispose of waste, but also fully recover and utilize the heat generated after combustion, which is conducive to improving the shortage of land and energy resources in today's society. However, the fuel composition of waste incinerators is complex, including medical, domestic and industrial waste. There are a variety of toxic pollutants in the flue gas after these wastes are burned, such as nitrogen oxides, sulfur oxides, hydrogen chloride, chlorinated organics, and alkali metals and heavy metals carried by fly ash. If it is allowed to be discharged into the atmosphere, it will cause serious consequences no matter it...

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Problems solved by technology

The above improvement methods have a narrow scope of application, that is, adding a certain additive or replacing the carrier may improve the ability of the catalyst to resist a certain poisonous substance. However, in the actual operation process, the composition of the flue gas is complex and multiple toxic substances coexist. Therefore, It is still difficult to ensure the long-term efficient operation of SCR catalysts by simply using catalyst modification

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