Exbaust gas purification method and device by pulse corona dicharging method

Abstract

A dry pulse corona discharge method for cleaning fume features that the high-temp fume is moistened and cooled, and then reacted on ammonia gas under high pressure to generate by-product which is collected. Its apparatus is composed of a moistening-cooling tower, an ammonia gas feeder, a ns-class high-voltage pulse power supply, plasma reactor and by-product collector.

Description

technical field [0001] The invention belongs to the technical field of waste gas purification. Specifically relates to a method and device for purifying sulfur dioxide and nitrogen oxides in flue gas. Background technique [0002] With the rapid economic development of various countries in the world, the consumption of coal as the main energy has increased sharply, and the emissions of sulfur dioxide, nitrogen oxides and other gas pollutants produced during the combustion process have increased accordingly, among which sulfur dioxide and nitrogen oxides are acidic The gas, combined with water molecules in the atmosphere, forms acid rain, which brings serious economic losses and environmental pollution to human beings. In 1995, my country's thermal power installed capacity reached 160 million kW, and sulfur dioxide emissions were 8.3 million tons, accounting for about 35% of the country's total, while nitrogen oxide emissions were 4.3 million tons. By 2000, thermal power ins...

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Problems solved by technology

The collection rate of dust and liquid droplets in the semi-dry method is only 85-95%, and the collection efficiency of liquid droplets is not high, resulting in a large amount of ammonium salts being discharged into the atmosphere with the purified flue gas, while the collection rate of dust and ammonium salts in the dry method is It can reach more than 98.5%. Compared with the dry method, the semi-dry method needs to increase the huge water circulation and water treatment facilities, and the energy consumption in the crystallization process is relatively large; the semi-dry method’s spray drying tower tracks the flue gas load and adjusts the maintenance system The balance of water and ammonium salt is also more difficult

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