Method for eliminating secondary particle precursors with particle size less than 2.5 microns in smoke

Abstract

The invention discloses a method for eliminating secondary particle precursors with the particle size less than 2.5 microns in smoke, belongs to such fields as combustion science, environmental engineering, high voltage technology, gas ionization discharge and plasma technology, and relates to the method for eliminating secondary particle atmospheric pollutants with the particle size less than 2.5 microns in the smoke by injecting oxygen active particles in a flue. The method is characterized in that the oxygen active particles O2<+> and O3 are injected in the flue; the O2<+> is reacted with water in the smoke to generate hydroxyl radicals OH; the O3 is reacted with NO in the gas to generate NO2; the OH is reacted with NO2 and SO2 in the smoke to generate nitric acid and sulfuric acid mist; the acid mist is recovered to resource materials-nitric acid and sulfuric acid solution by an electric acid mist remover; the OH is reacted with VOC to generate CO2 and H2O; the elimination ratio of the secondary particle precursors with the PM of 2.5 is high above 85%. The method has the following effects and benefits: large equipment is not required to be added, and any catalysts, oxidants and reducing agents are not used, so that the one-time investment and operation costs are largely reduced.

Description

technical field [0001] The invention belongs to the fields of combustion science, environmental engineering, high-voltage technology, gas ionization discharge, plasma technology and the like, and relates to a method for eliminating secondary particle precursors whose particle diameter is less than 2.5 microns in flue gas. Background technique [0002] my country is a rising economic power. Two-thirds of its energy comes from coal, and its dependence is high. From 2005 to 2010, coal consumption increased by 44%. Industrial enterprises and power plants burn coal to form fine particulate matter (PM2.5) pollution with a particle size of ≤2.5 μm. From January 11 to 14, 2013, Beijing was shrouded in high-density smog, and the PM2.5 concentration exceeded 600 μg / m 3 , up to 900μg / m at night 3 , Beijing's air pollution level reached the most serious "dangerous" level for three consecutive days, exceeding the national environmental daily average standard concentration (75μg / m 3 ) ...

AI Technical Summary

Problems solved by technology

In short, the biggest problem in the current method of controlling PM2.5 secondary particle precursor air pollution sources is that all the flue gas needs to undergo desulfurization and denitrification chemical reactions in the reactor (tower), which brings about a large reactor size and high primary investment. question

Therefore, it is urgent to solve the problem that all the flue gas passes through the reactor (tower), plasma reactor and regenerative combustion oxidizer, etc. A series of problems such as high and low removal efficiency

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