In China, the removal of NOx and SO2 emitted from coal combustion boiler has become an important issue because of stringent limits imposed on the allowable levels of NOx and SO2 emissions. Several successful demonstrations in power plants have been set up with the De-NOx and De-SO2 technology of electron beam (EB), based on the non-thermal plasma, with high energy. And, many great achievements about pulsed corona induced plasma chemical process have been achieved in some areas, such as chemical reaction kinetics, gas phase electric discharge physics, nanosecond grade high voltage pulse electric supply and pulsed corona reactor. Combining plasma with adsorption, derived from pulsed corona, has also been studied extensively and made great progress in the application. However, there are still some key theoretical and technological problems which should be resolved before applying this technology to remove NOx and SO2 in power plant. Among them, how to reduce reaction energyconsumption and increase NOx and SO2 removal efficiency greatly may be very important and difficult. In order to solve the above two problems, an experimental investigation on simulated flue gas has been conducted changing parameters using the pulsed discharge plasma reactors, such as pulse width, wire electrode diameter, discharge gap, gas composition, gas temperature, etc. that are believed to be fundamental in the De-NOx and De-SO2 process. Future works concerning about measurements of oxidizing radical OH concentration and about simulation of electric discharge chemical process, which are now in progress, have been put in order to explain more details of De-NOx and De- SO2 processes.

Simultaneous removal of SO2 and NOx from combustion flue gas in a discharge plasma reactor

249th National Meeting (2015)

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