PROCESS AND DEVICE FOR OPERATING A GAS BURNER

摘要

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 th e gas-to-air ratio to a lambda set point >1, to which a set point Uis of the ionizatio n signal corresponds. To guarantee low-emission combustion in different operating sta tes, 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 sign al 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 th an the lower limit value Uiu of the ionization signal Ui and when the value is lowe r than the set point Uis at a lambda value < 1, the control circuit increases the ga s volume flow to an end value, and another switch-off signal is generated for the burner w hen this end value is reached.