Analysis of a Pulsed Corona Circuit
LOS ALAMOS NATIONAL LAB NM
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A fast risetime pulsed corona reactor has been developed to investigate the treatment of polluted gaseous effluents. The pulsed high-voltage circuit used to drive the coaxial reactor tube consists of a controllable constant current power supply, a storage capacitance, a self-breaking spark gap, and fast currentvoltage diagnostics. The circuit design is coaxial from the storage capacitor a length of 50 Q cable to the reactor tube a coaxial wire-tube geometry to minimize the circuit inductance. Using a high-pressure hydrogen spark gap, the apparatus achieved a risetime of approximately 2 ns. The length of the applied pulse was altered by using different lengths of storage capacitor cable. A minimum pulse width was achieved by using a matching 50 Q load placed before the reactor tube, which produced a square pulse with a width of 10 ns at the input to the reactor tube. The driving circuit and corona load were simulated using a simple time-varying resistance to represent the corona discharge. The resulting waveforms are compared with those obtained experimentally. The simulation results were also used to verify the integrity of the fast-pulse measurements. Finally, experimentally obtained results are presented on the effect of the corona pulse width on the efficiency of NO decomposition in nitrogen.
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