Industrial-scale experiments of desulfuration of coal flue gas using a pulsed corona discharge plasma

The flow rate of flue gas in the industrial experiments was 3000 Nm³/h. The flue gas from the boiler burning coal was used. The influences of operating parameters on the efficiency of desulfuration (DeSO₂) were studied, which include the retention period of flue gas in the reactor, the initial concentration of SO₂ in flue gas, a mole ratio of NH₃ to SO₂ in the gas, the temperature of the gas, as well as the power consumption of pulsed corona discharges. The experimental results shown that the efficiency of DeSO₂ was above 80%, when the initial concentration of SO₂ was 1000 ∼ 2000 ppm, the gas temperature was 60 °C ∼ 75 °C, the retention period was more than 5.8 s, a mole ratio of NH₃ to SO₂ was 2 : 1, the water content in flue gas was above 6%, and he consumption was 2.5 ∼ 3.5 Wh/Nm³.