STUDY ON PULSE CORONA NON-THERMAL PLASMA REACTOR FOR SO₂ REMOVAL IN FLUE GAS

The pulse corona induced non-thermal plasma chemical process, as a technique applied to dry flue gas desulfurazition, was developed in recent decades. The technique is researched actively in many countries. In China, the technique is being transformed to industrial application. In the paper, detailed studies were made on the influences of geometric structure and electrodes configuration of pulse corona reactor, and the compositions of flue gas on the process of short pulse energy transmission. The following results were obtained 1.The static capacitance and non-linear resistance of reactor were studied. The formula of static capacitance, which is referred to the distance of line-plate, the adjacent distance and radius of discharge electrode, was obtained. The resistance value ranges over several hundreds Ohm during the time of pulse wavelength and is larger than 106 Ohm during the time of pulse wave tail. 2.The discharge loop equations were solved. Several theoretic formulae were obtained, such as pulse voltage, pulse current, pulse width, and pulse rise time. These formulae were referred to the discharge loop parameters. The influences of loop inductance, loop resistance, and pulse forming capacitance on pulse waveform were analyzed, methods of determining these parameters were given. 3. The equations of wave propagating on line-plate discharge system were solved with a character-difference technique. According to the theoretic calculation and experimental measurement results, the length and height scale of electric field in reactor were given. 4.A new viewpoint was put forward, which the voltage of pulse wave tail is a factor of causing spark breakdown. The range of voltage of pulse wave tail is that the average strength of electric field caused by the voltage of wave tail must lower than 5 kY/cm. In order to avoid spark breakdown, a circuitwas designed, which can leak off wave tail voltage, The features of the circuitare simple structure and low cncrgy consumption.5.The VlI characteristics of pulse corona discharge were studied on theaspect of clectrode configuration. The influences of line-plate distance andelectrode adjacent distance of reactoc and pulse forming capacitance onpulse wavefOrm were analyzed. A metbod of configuring electrodc was given.6. Tbe above-mentioned resuIts were applied to refOrm aDd design 3000Nm3lh pulsc corona reactor for fluc gas desulfurisation. The operationparamctcrs, such as flue gas temperature, humidity, resident time and nowvelocity, were determined. According to the operation rcsults of 3000 Nm'/hreactot, 2oooo Nm3/h pulse corona reactor fOr nuc gas desulfurisatioll wasdesigned.