Injection system and method for reducing dioxin and mercury in incineration flue gas

Abstract

The invention provides an injection system and method for reducing dioxin and mercury in incineration flue gas, the system comprises a storage bin, a metering feeder, a mixer and an air injection device, the storage bin, the metering feeder and the mixer are communicated in sequence, the air injection device is arranged on the lower portion of the storage bin, and the metering feeder is communicated with the mixer. And the throat part of the mixer is connected with an air blower. The method provided by the invention comprises the following steps: firstly conveying activated carbon to a storage bin, then quantitatively conveying the activated carbon to a mixer through a metering feeder, and generating negative pressure to adsorb the activated carbon when high-pressure air generated by an air blower arranged at the throat part of the mixer passes through the throat part of the mixer at a high speed. The adsorbed activated carbon and high-pressure air are injected into a rear flue of the deacidification tower together through an air injection device, so that activated carbon powder and the flue gas are fully mixed, and dioxin and mercury in the flue gas are removed by the activated carbon in an adsorption manner.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an injection system and method for reducing dioxin and mercury in incineration flue gas. Background technique [0002] Garbage disposal has always been a problem that plagues urban development. The traditional method is mainly landfill, which not only occupies a large amount of land, but more importantly, the environmental pollution is becoming more and more serious. In recent years, the country has put green environmental protection as the focus of work. Municipal waste incineration power generation is the main means of dealing with urban waste. With the inclination of national industrial policies, many policies and measures to support waste power generation have been formulated. In recent years, construction projects of waste incineration power plants have developed rapidly. [0003] Dioxin is known as the most poisonous substance in the world. Its toxicity is ...

AI Technical Summary

Problems solved by technology

However, in actual operation, in order to maintain the normal operation of the bag filter, the flue gas temperature cannot be lower than zero, so as not to cause acid mist condensation, cause filter bag corrosion, or block the entire filter bag due to water vapor condensation

However, due to its high saturated vapor pressure, mercury metal is not easy to condense at higher temperatures, so it is difficult to be completely removed by the bag filter.

[0005] To sum up, the existing technical means for the treatment of heavy metal mercury and dioxins in the flue gas cannot meet the current and future actual requirements for environmental protection in society

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