Method and device for treating oxynitride-containing smoke

Abstract

The invention relates to a method and a device for treating oxynitride-containing smoke. The method comprises the following steps of: 1) introducing the oxynitride-containing smoke into a distributor through a flue; 2) introducing a gas source into an ozone generator to generate ozone, cooling the ozone, allowing the ozone to enter a pipeline, diluting the cooled ozone, allowing the ozone to enter a mixer and mixing to obtain the ozone diluted uniformly, and allowing the ozone to enter the distributor; 3) mixing the ozone diluted uniformly and the oxynitride-containing smoke, generating oxidizing reaction, cooling and feeding into an absorption tower; and 4) absorbing the smoke by using the absorption tower to obtain tail gas and discharging the tail gas through a chimney. Based on low-temperature oxidability of the ozone and after action, the denitration rate of a smoke denitration system reaches over 85 percent. The system is convenient and quick in use, stable in effect and wide in application range.

Description

technical field [0001] The invention relates to a treatment method and a treatment device for flue gas containing nitrogen oxides, in particular to a treatment method and a treatment device for removing nitrogen oxides in flue gas by using ozone, and belongs to the technical fields of environmental protection and chemical industry . Background technique [0002] Nitrogen oxides and sulfur oxides produced during the utilization of coal, natural gas, and heavy oil, as well as some chemical production, have caused serious harm to the atmospheric environment. The valences of nitrogen in nature are -3, 0, +1~+5, and the forms that exist in boiler flue gas are basically nitric oxide and nitrogen dioxide, which are +2 and +4. At present, the technologies commonly adopted for air pollution control include dry method, semi-dry method and wet method. Dry and semi-dry methods have the disadvantages of poor adaptability to flue gas changes and unstable desulfurization efficiency. Wet...

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Problems solved by technology

[0003] There are two main types of nitrogen oxide removal methods: one is to control the production of nitrogen oxides through the combustion process, and the efficiency is about 30-50%. This method has low efficiency and is easy to cause slagging in the furnace pipeline

[0004] 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 60-90%. The gas has not been dedusted, and there is a lot of dust in the flue gas, which can easily cause blockage and wear of the SCR metal catalyst. The heavy metals in the fly ash can also cause catalyst poisoning, and the operation and investment costs are very expensive.

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