Glow discharge in water cavitation cloud with improved efficiency for hydrogen peroxide production

Glow discharge in water cavitation cloud with improved efficiency for hydrogen peroxide production

Článek WoS

The previously developed AC discharge in a dense hydrodynamic cavitation cloud (HCC) in water (called CaviPlasma) was modified to enhance hydrogen peroxide production efficiency. The experimental setup consisted of a closed water circuit with a reservoir. Treated water was pumped through a Venturi nozzle to create a HCC. Alternating high voltage (HV) imposed on electrodes ignited the discharge in this cloud of water vapors and droplets. Optimization of the hydraulic circuit eliminated the vacuum pump and prolonged the cavitation cloud, so both electrodes are in the cavitation cloud. The absence of the water column between the cavitation cloud's end and the electrode opposite the nozzle significantly reduced the resistance of the discharge branch of the circuit. This change considerably altered the discharge ignition and regime of operation. Consequently, electrical power losses decreased, and higher power delivery to the discharge was achieved. The system operated with input HV power ranging from 0.3 kW to 2 kW and water flow rates from 1.2 m3h-1 to 2.0 m3h-1.These modifications increased the efficiency of hydrogen peroxide (H2O2) production, achieving an energy yield of 12.4 gkWh-1, compared to the previous 9.6 gkWh-1, and a peak production rate of 17.6 gh-1, seven times higher than the former 2.4 gh-1. The discharge properties were studied using optical and electrical diagnostics. Optical emission spectroscopy proved the production of H, O and OH species in the discharge. The time development of the discharge was followed by phase-resolved discharge imaging using an ICCD camera. The positive bias of current flowing in the discharge tube was observed, which could be attributed to the displacement of the positively charged species (ions) flowing in the same direction as the cavitation cloud.

The previously developed AC discharge in a dense hydrodynamic cavitation cloud (HCC) in water (called CaviPlasma) was modified to enhance hydrogen peroxide production efficiency. The experimental setup consisted of a closed water circuit with a reservoir. Treated water was pumped through a Venturi nozzle to create a HCC. Alternating high voltage (HV) imposed on electrodes ignited the discharge in this cloud of water vapors and droplets. Optimization of the hydraulic circuit eliminated the vacuum pump and prolonged the cavitation cloud, so both electrodes are in the cavitation cloud. The absence of the water column between the cavitation cloud's end and the electrode opposite the nozzle significantly reduced the resistance of the discharge branch of the circuit. This change considerably altered the discharge ignition and regime of operation. Consequently, electrical power losses decreased, and higher power delivery to the discharge was achieved. The system operated with input HV power ranging from 0.3 kW to 2 kW and water flow rates from 1.2 m3h-1 to 2.0 m3h-1.These modifications increased the efficiency of hydrogen peroxide (H2O2) production, achieving an energy yield of 12.4 gkWh-1, compared to the previous 9.6 gkWh-1, and a peak production rate of 17.6 gh-1, seven times higher than the former 2.4 gh-1. The discharge properties were studied using optical and electrical diagnostics. Optical emission spectroscopy proved the production of H, O and OH species in the discharge. The time development of the discharge was followed by phase-resolved discharge imaging using an ICCD camera. The positive bias of current flowing in the discharge tube was observed, which could be attributed to the displacement of the positively charged species (ions) flowing in the same direction as the cavitation cloud.

CaviPlasma, plasma-activated water, hydrodynamic cavitation, electric discharge, hydrogen peroxide, diagnostics, PAW

CaviPlasma, plasma-activated water, hydrodynamic cavitation, electric discharge, hydrogen peroxide, diagnostics, PAW

CECH, J.; STAHEL, P.; PROKES, L.; TRUNEC, D.; HORNAK, R.; RUDOLF, P.; MARSALEK, B.; MARSALKOVA, E.; LUKES, P.

2026

01.06.2025

Iop Publishing Ltd

Plasma sources science & technology

34

6

Spojené království Velké Británie a Severního Irska

18

https://iopscience-iop-org.ezproxy.lib.vutbr.cz/article/10.1088/1361-6595/addf79