System and method for efficiently removing dust in flue gas of coal-fired power plant

Abstract

The invention provides a system for efficiently removing dust in flue gas of a coal-fired power plant. The system is arranged between a boiler and a chimney of the coal-fired power plant, and used for removing dust in the flue gas discharged from the coal-fired power plant. The system comprises an economizer, a denitration reactor, an air preheater and a desulfurizing tower which are communicated sequentially, wherein the economizer is communicated with the boiler, and the desulfurizing tower is communicated with the chimney. The system further comprises a multi-tube type cyclone separator, wherein the multi-tube type cyclone separator is arranged between the economizer and the chimney and used for removing dust in the flue gas of the coal-fired power plant. The invention further provides a method for efficiently removing dust in the flue gas of the coal-fired power plant. The system for efficiently removing dust in the flue gas of the coal-fired power plant is reasonable in design, and for the flue gas discharged from the coal-fired power plant, the multi-tube type cyclone separator is arranged between the economizer and the chimney to remove dust from the flue gas; moreover, the multi-tube type cyclone separator can meet the requirement for purification efficiency of the system, and the flue gas discharged from the coal-fired power plant can reach the corresponding discharging standard.

Description

technical field [0001] The invention relates to the technical field of waste gas purification, in particular to a high-efficiency dust removal system and method for flue gas of a coal-fired power plant. Background technique [0002] With the increasingly prominent problems of environmental pollution in our country, especially the haze weather has brought increasingly serious impact on people's life and health, it is necessary to further reduce the discharge of pollutants and improve discharge standards. Therefore, future coal-fired power plants will have to meet emission standards for gas-fired power generation. [0003] The flue gas coming out of the coal-fired power plant boiler after combustion must go through dust removal, desulfurization and denitrification, and the flue gas that meets the emission standard can be discharged into the atmosphere. From the boiler, the flue gas passes through the economizer, denitrification reactor, air preheater, booster fan, desulfuriza...

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Problems solved by technology

Patent document CN200710092757.8 discloses a pre-cyclone pre-dust removal SCR flue gas denitrification process, but its dust removal effect is not good, it is not suitable for such a huge flue gas flow in coal-fired power plants, and cannot meet the emission standards

[0004] Although the flue gas from coal-fired power plants has been treated accordingly, due to backward technology and incomplete removal, the flue gas discharged from coal-fired power plants still cannot meet the emission standards, especially the amount of dust in the flue gas has seriously exceeded the standard

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