Experimental Study On Removal Of Various Pollutants From Coal-fired Flue Gas By Pulse Discharge

Currently, the pollution of our atmosphere is not optimistic, the main reason of causing serious air pollution is industrial production of coal combustion. The latest thermal power plant air pollutant emission standards specify the emission concentration limits of pollutants, including the gas dust limit of 30 mg / m3; Sulfur dioxide limits in the new coal-fired power boiler combustion is 100 mg / m3; The emission limits of nitrogen oxides concentration also has increased to 100 mg / m3, therefore, the situation of pollutant emissions is very serious.Pollutant emissions from coal-fired flue gas are mixed together, separately removing contaminants is not only difficult, but also a waste of resources, so the possibility of synergistically removing pollutants in the flue gas exploration is necessary. Powered by pulse corona, can achieve to remove SO₂, NO_X synergistically. Salient features of high-voltage pulse is the rise time of the pulse is steep, the pulse width is narrow, pulse can instantly generate high peak voltage, fully ionizing gas, fully charging dust, so that they can move to the collecting electrode under the action of the electric force. During the pulse corona, the current is more well-distributed than the DC power supply, which will help to overcome the anti-corona phenomenon. Meanwhile, the pulse corona discharge can produce large amounts of oxidative free radical species to oxidize SO₂, NO_X, so as to make various pollutants in the flue gas remove synergistically.In this paper, we analyze the principle of pulse discharge to remove SO₂, NO_X synergistically. To explore the advantages of using pulsed corona discharge, we adopt two programs for the removal of SO₂, NO_X experimental study.（1） Explore two pollutants removal efficiency under high-voltage DC power supply;（2） On the basis of high-voltage DC power supply, we reform the high voltage DC power supply, so that it can produce pulse corona discharge. The results show that, in the breakdown voltage of the 90% condition, either alone or synergistic removal removal, using the same experimental parameters, the removal efficiency of the pulse power supply is much greater than DC power supply removal efficiency. in the removal of a single, the increasing efficiency of SO₂ is the ten percent to fifty percent; Similarly, removal alone, the increasing efficiency of NO is ten percent to fifty percent; and in synergy, the increasing efficiency of SO₂ in the ten percent to thirty percent; the increasing efficiency of NO in the ten percent to twenty percent; in certain circumstances of other parameters, removing the gas alone or synergistically, increasing in the DC voltage or pulse voltage, increasing the gas residence time can improve the removal efficiency of SO₂ and NO; in the same circumstances SO₂ conversion efficiency higher conversion efficiency of NO.