Method for removing SO2 and NOX in combustion coal flue gas through corona discharge and liquid phase oxidation

Abstract

The present invention discloses a method for concurrently removing SO2 and NOX in combustion coal flue gas through combination of corona discharge and liquid phase oxidation. The method comprises that: combustion coal flue gas requiring treatment is introduced into a corona discharge reactor inlet, is treated through a pre-oxidation spraying system, and then enters a corona discharge reactor electric field, and part of SO2 and part of NO in the flue gas are respectively oxidized into SO3 and NO2 with free radicals and active substances produced through high voltage corona electric field discharge; and with the combination effect of the electric field and the diffusion, SO3, NO2, the unoxidized SO2 and the unoxidized NO enter a spraying water type electrode liquid in the reactor in a migration manner, SO2 is further oxidized into S(VI) through liquid phase catalysis to finally form a high valence state acid, and NO and NO2 are subjected to absorption reduction through a urea solution so as to achieve a purpose of combustion coal flue gas purification. With the method, concurrent desulfurization and denitrification on coal flue can be achieved, the investment is low, running is economical, and characteristics of high desulfurization and denitrification efficiency, high corona discharge energy utilization rate, solution recycling, sulfur resource recycling and broad application prospect are provided.

Description

technical field [0001] The invention relates to a combination of corona discharge and liquid phase oxidation in the field of flue gas purification to simultaneously remove SO from coal-fired flue gas 2 and NO X Methods. Background technique [0002] With the development of society and the improvement of people's living standards, environmental issues have attracted more and more attention. Energy and environment are urgent problems to be solved for human survival and development. my country is a developing country that mainly burns coal, and it is also the largest coal producer and consumer in the world, and the national coal consumption continues to increase every year, and the proportion of coal in the energy structure will not change for a long time. [0003] At present, in my country's energy consumption structure, coal accounts for 68%, oil accounts for 23.45%, and natural gas accounts for only 3%. By the end of 2007, the installed capacity of power generation in m...

AI Technical Summary

Problems solved by technology

Each removal unit in this type of technology has a mature technology, which is easy to integrate and develop, and is widely used. Generally, it has a relatively ideal desulfurization and denitrification efficiency. It is suitable for flue gas denitrification in large-scale coal-fired power plants. The catalyst is expensive and needs to be replaced regularly. The operating cost is high, and there are problems such as poor sulfur and water resistance of the catalyst, easy poisoning and deactivation, and ammonia escape. At the same time, it occupies a large area , complex process, high investment and operating costs, etc., so it has the advantages of compact structure, low cost, low investment and operating costs, high removal efficiency, low energy consumption, etc. At the same time, desulfurization and denitrification technology has received more and more attention. It is the future Important development trend of flue gas desulfurization and denitrification technology

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