Ozone low-temperature oxidation denitration technology and system

Abstract

The invention discloses an ozone low-temperature oxidation denitration system which comprises a flue, an ozone generator and a washing tower. The ozone low-temperature oxidation denitration system is characterized in that an ozone distributor is mounted in the flue; the ozone is supplied to an ozone channel of the ozone distributor through a pipeline at an outlet of the ozone generator; the ozone is jetted into the flue by the ozone distributor; the outlet of the flue is connected with the washing tower; the mixture of the ozone and exhaust gas in the flue enters into the washing tower. Compared with the prior art, the ozone low-temperature oxidation denitration system has the beneficial effects that the investment and running cost is lower than that of SCR (Selective Catalytic Reduction) technology; NOx removal rate is high and can reach 95% or more; the technique is simple, the expandability is excellent and the technological operation is simple, stable and reliable; the adaptation of the technical condition is wide; operation at low temperature is carried out and no high-temperature window is required; the system is free from ammonia escape secondary pollution and ammonium sulfate corrosion. The invention also discloses an ozone low-temperature oxidation denitration technology.

Description

technical field [0001] The invention relates to an ozone low-temperature oxidation denitrification process and system, belonging to the technical field of environmental protection. Background technique [0002] Nitrogen oxide gas in air pollution is one of the main pollution components, and boiler flue gas is the main pollution source of nitrogen oxide emissions. Therefore, the treatment of nitrogen oxide gas pollution needs to start from the process of boiler flue gas emission. [0003] CN100354022C discloses a method for ozone oxidation of boiler flue gas. In its technical scheme, ozone is sprayed into the low-temperature section of the boiler flue with a temperature range of 100-150° C. to oxidize nitrogen monoxide in boiler flue gas into water-soluble High-valence nitrogen oxides, and use lye to wash the treated boiler flue gas to remove nitrogen oxides in the flue gas. [0004] The problem existing in the implementation process of the above technical solution is that ...

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Problems solved by technology

[0004] The problem in the implementation of the above technical solution is that the temperature of the boiler flue gas is relatively high, generally above 200°C, which makes it difficult to achieve low-temperature control of the temperature during the ozone transmission process, but in a high-temperature environment, the ozone The half-life period will be shortened with the increase of temperature, which makes the ozone attenuate to a considerable extent before the destocking process, resulting in low efficiency of the destocking process and incomplete destocking

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