Study on behavior and emission of methane/hydrogen diffusion flame with applied DC electric field
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This experimental study investigates the effect of DC electric fields on flame behavior and emissions in non-premixed hydrogen/methane flames using a co-flow burner. The study considers varying hydrogen mole fractions of 0.1, 0.3, and 0.5, and dif-ferent fuel flow velocities of 2.0, 6.3, and 8.0 cm/s. To introduce DC electric fields, a high voltage terminal was connected to the fuel nozzle, while the ground terminal was connected to an upper mesh located above the flame. The applied DC voltages ranged from Vdc = -10 kV to +10 kV. The study reveals that the addition of hydrogen reduces flame height. Furthermore, when subjected to DC electric fields, the flames exhibit movement towards the lower potential side, displaying stable and oscillating behaviors due to the Lorentz force acting on positive ions within the flames. The concentrations of CO and CO2 exhibit insignificant changes with varying hydrogen mole fractions. However, when exposed to positive voltage, CO, CO2, and NOX emissions are reduced. This research provides a de-tailed analysis of flame/flow behavior and emission characteristics when hydrogen and DC electric fields are introduced, providing valuable insights into the control of flame behavior and pollutant emissions.
Abstract
This experimental study investigates the effect of DC electric fields on flame behavior and emissions in non-premixed hydrogen/methane flames using a co-flow burner. The study considers varying hydrogen mole fractions of 0.1, 0.3, and 0.5, and dif-ferent fuel flow velocities of 2.0, 6.3, and 8.0 cm/s. To introduce DC electric fields, a high voltage terminal was connected to the fuel nozzle, while the ground terminal was connected to an upper mesh located above the flame. The applied DC voltages ranged from Vdc = -10 kV to +10 kV. The study reveals that the addition of hydrogen reduces flame height. Furthermore, when subjected to DC electric fields, the flames exhibit movement towards the lower potential side, displaying stable and oscillating behaviors due to the Lorentz force acting on positive ions within the flames. The concentrations of CO and CO2 exhibit insignificant changes with varying hydrogen mole fractions. However, when exposed to positive voltage, CO, CO2, and NOX emissions are reduced. This research provides a de-tailed analysis of flame/flow behavior and emission characteristics when hydrogen and DC electric fields are introduced, providing valuable insights into the control of flame behavior and pollutant emissions.
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