펄스 플라즈마 공정을 이용한 기체상 오염물질 제거를 위한 상용화 규모의 고출력 나노펄스 발생기 연구

Abstract

This thesis describes design and industrial application of a high-power nano-pulse generator (NPG) for pulsed plasma generation. First, the practical requirements and limitations on NPG design parameters, and achievable values were discussed. Analytic design details were formulated using design equations and calculated using a spreadsheet. Second, for feasibility study, a basic model unit for industrial scale plant applications of a 120-kW NPG system was developed and tested by applying it to a medium-size industrial incinerator plant with a gas flow rate of 50,000 Nm3/h. The nominal operation conditions of NPG are pulse peak voltage of up to 150 kV with 500-ns (FWHM) pulse widths, and 240-Hz maximum repetition rate in a non-thermal plasma reactor shaped similar to an electrostatic precipitator. The dynamic operating characteristics of this system were measured and analyzed. The typical peak voltage and current measured at the corona reactor were ~ 119 kV and 5.01 kA, which are equivalent to peak power of 596 MW. The energy-transfer efficiency of the MPC NPG becomes 64.3% with a pulsed corona reactor. Lastly, based on these design and test results, 20 units of NPG were installed and demonstrated at a full industrial-scale plasma reactor (capacity, 676,000 Nm3/h) applied to an iron-ore sintering plant. During the test operation for more than 6 months, the system showed energy density of 2.52 W·h/Nm3 for 60% NO2 oxidation at 115 °C.