29.
Laboratory-scale and parametric experiments of SO
2 and NO
x removal from the simulated combustion gas by pulsed corona discharge have been performed by changing the combustion gas composition and temperature, the electrode configuration of plasma reactor, and the polarity of high-voltage electrode. The following results are obtained: 1) the higher the concentration of H
2O and O
2, the higher the efficiency of desulfurization and denitrification at the same specific input; 2) the pulsed corona discharge with a voltage pulsewidth as short as 200 ns of negative polarity shows the possibility to attain almost 90 percent deSO
x and deNO
x efficiency at the specific discharge input of 20 J/g, which is almost the same as the specific input in the electron-beam process; 3) the deNO
x characteristics show a little temperature dependence in the range of 70 to 130°C, but the deSO
x efficiency increases rapidly in the temperature region below 100°C suggesting the thermochemical dependence of deSO
x reaction; 4) when desulfurization and denitrification proceed, the white dendritic powder deposits on the plasma reactor whose composition is identified to be 49 mol% (NH
4)
2SO
4 and 47 mol% of 2NH
4NO
3 · (NH
4)
2SO
4, and the ratio of SO
2, NO and NH
3 of the deposit is almost equal to that of supplied gas.
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