Treatment method for removing nitrogen oxides by virtue of ozone function

Abstract

The invention relates to a treatment method for removing nitrogen oxides by virtue of an ozone function. The method comprises the following steps: (1) flue gas containing the nitrogen oxides is introduced into a flue and an ozone adding distributor is additionally arranged; (2) a gas source is introduced into an ozone generator, ozone is generated and diluted and then is mixed in a mixer to obtain ozone diluted uniformly, and the ozone diluted uniformly enters the ozone adding distributor; (3) the ozone diluted uniformly and the flue gas containing the nitrogen oxides are mixed in the ozone adding distributor and are subjected to oxidation reaction, NO in waste gas is converted into high-valent nitrogen oxides and then the high-valent nitrogen oxides enter an absorption tower; and (4) the flue gas is absorbed by the absorption tower and absorption liquid and is purified to obtain tail gas, and the tail gas is exhausted from a chimney. The treatment method for removing the nitrogen oxides has the high efficiency, the low energy consumption and the convenience in use.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and chemical industry, and in particular relates to a treatment method and a device for removing nitrogen oxide compounds by utilizing the action of ozone. Background technique [0002] During the combustion of coal, oil, natural gas and other fuels and the production of chemical industry, due to the limitation of low-nitrogen combustion technology in the furnace, the exhausted flue gas contains a large amount of nitrogen oxides and sulfur oxides, which has caused serious damage to the atmospheric environment and human health. In order to further reduce the emission of nitrogen oxides, the flue gas after combustion must be denitrified. At present, the processes commonly adopted for the purification of flue gas generally include dry method, semi-dry method and wet method. The dry method and semi-dry method have the disadvantages of poor adaptability to flue gas changes and unstabl...

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Problems solved by technology

At present, the processes commonly adopted for the purification of flue gas generally include dry method, semi-dry method and wet method. The dry method and semi-dry method have the disadvantages of poor adaptability to flue gas changes and unstable desulfurization efficiency. The wet method is currently the The widely used method can remove sulfur oxides in flue gas, but nitrogen oxides lack chemical activity and are difficult to be absorbed by aqueous solution, the denitrification efficiency is too low, and by-products are difficult to handle

[0003] At present, there are two main types of nitrogen oxide removal methods in the production process: one is to control the production of nitrogen oxides through improved combustion technology, and the efficiency is about 30% to 50%. Slagging; the second type of flue gas denitrification technology is the selective catalytic reduction denitrification technology (SCR) widely used in Europe, America, Japan and other countries. The denitrification efficiency is generally 60% to 90%. The reaction temperature is 320°C-400°C, but the flue gas in the high-temperature section has not been dedusted, and there is a lot of dust in the flue gas, which may easily cause blockage and wear of the flue between the reactors, and the heavy metals in the fly ash will also cause the catalyst Poisoning reduces the denitrification efficiency, and the operation and investment costs of the selective catalytic reduction denitrification technology (SCR) are very expensive, which increases the production cost of the enterprise

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