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1 Transactions of the Institute of Fluid-Flow Machinery

1 2007

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Plasma and electric field control of natural gas combustion

Altendorfner F., Dinkelacker F., Hammer Th., Kappes Th., Lins G., Sakrieh A., Lin S., Vega M.

Transactions of the Institute of Fluid-Flow Machinery

2007

nr 119

5-16

The influence of electric fields on the stability and emissions of naturaI gas combustion was investigated at a seven-hole Bunsen burner at pressures p between 0.1 MPa and 1MPa being representative for combustion processes in gas turbines. For the E-field generation a ring shaped high voltage electrode placed above the burner head was used. Self-sustained gas discharge formation was avoided by keeping the spatial average of the reduced electric field below 40Td (1 Td = 10-21 Vm2). In this case we found that the reduced electrical current I/p is well described by a power law of the reduced voltage U/p with power 1.5. Due to the applied electric field the air number, at which lean blow off occurred, could be increased from 1.14 to 1.22 resulting in a decrease of nitric oxide emissions of more than 20%. At the same time the carbon monoxide emissions decreased by more than 90%. The electric power consumption this effect was < 0.02% of the thermal power of the burner. Plasma combustion control was tested at a small scale atmospheric pressure laboratory set-up consisting of a single flame Bunsen type burner and an integrated gliding arc reactor centered in the cylindrical burner tube. Half of the methane fuel was subjected to plasma induced partial oxidation resulting in format of hydrogen, carbon monoxide, and small concentrations of by-products, whereas a very lean mixture of the remaining fuel with air was directly fed to the burner tube. An increase of the lean blow off air number from 1.6 to 2.0 was achieved. Further the fuel conversion was improved from 90% to 95%.