Experimental Investigation of Ozone Generation in Multi-Cell Dielectric Barrier Discharge Reactors
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Ozone is a sustainable oxidant with applications in water treatment, air purification, and food sterilisation. Dielectric barrier discharge (DBD) reactors are attractive for ozone generation because of their simplicity and scalability. Performance depends on both plasma processes and power supply characteristics. This research examined single-, two-, and three-cell dielectric tubes DBD reactor operated under varying voltages and frequencies to assess ozone yield and energy efficiency. FTIR spectroscopy confirmed ozone as the main product and enabled extended quantification beyond portable ozone detector saturation through calibration with detector readings (R² = 0.9997). Reactor scaling-up enhanced ozone generation, with the three-cell reactor achieving 11946 ppm and 17.25 g/h at 40 kVpp and 100 Hz, for discharge voltage and frequency, respectively. However, ozone concentrations from the two- and three-cell reactors were nearly identical across the SEI (Specific Energy Input) range due to high-voltage power supply (HVPS) limitations rather than reactor design. Efficiency analysis revealed two perspectives, based on discharge power, the ozone production efficiency (OPE) peaked at 396 g/kWh in a two-cell configuration at low SEI but declined at higher SEI owing to non-productive energy losses. Conversely, the overall ozone production efficiency (OOPE), referenced to system input power, increased with SOEI (specific overall energy input), with the two-cell reactor outperforming (16.0–22.3 g/kWh). These findings highlight the combined influence of plasma on ozone generation, offering guidance for scaling DBD reactors in industrial applications.
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