Process and device for operating a gas burner
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
May 2, 1997
filing date -
May 9, 1996
priority date (Note) -
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Abstract
In a process for operating a gas blower burner, a control circuit detects an ionization signal Ui derived from an ionization electrode, and it adjusts the gas-to-air ratio to a lambda set point >1, to which a set point Uis of the ionization signal corresponds. To guarantee low-emission combustion in different operating states, a range of control of the ionization signal Ui is set, whose upper limit value Uio is smaller than the maximum of the ionization signal Ui, and whose lower limit value Uiu is above the value that guarantees low-emission operation. A switch-off signal is generated for the burner if the ionization signal Ui leaves the permissible range of control RB for longer than a preset period of time. If the value is lower than the lower limit value Uiu of the ionization signal Ui and when the value is lower than the set point Uis at a lambda value <1, the control circuit increases the gas volume flow to an end value, and another switch-off signal is generated for the burner when this end value is reached.
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