Burner system

摘要

A grounded burner, actuators adjusting the supply of fuel and air to the burner, an ionization electrode in the flame region, a flame amplifier at the ionization electrode generating an ionization signal, and a final control device are included in a burner system. During air ratio control mode, the final control device sets a first actuator and adjusts a second actuator. During voltage control mode a voltage regulator controls the AC voltage source using the AC voltage measured by the voltmeter, in conjunction with an ionization current amplifier. The voltmeter is connected in parallel with a sequence of the ionization electrode, the flame region, the burner and the input of the ionization current amplifier. The voltage regulator is connected to the voltmeter such that, during voltage control mode, the time-averaged current caused by the voltmeter through the connection is less than 5% of the time-averaged current through the ionization electrode.

主权项

1. A burner system, comprising:
a grounded burner; first and second actuators with which the supply of fuel and air to the grounded burner is adjusted; an ionization electrode disposed in the flame region; a final control device which during air ratio control mode sets the first actuator and adjusts the second actuator using an ionization signal and an ionization signal setpoint; and a flame amplifier at the ionization electrode, generating the ionization signal and including
an AC voltage source generating an AC voltage for the ionization electrode,a voltmeter measuring the AC voltage;a voltage regulator having a connection to the voltmeter and during a voltage control mode controlling the AC voltage source based on the AC voltage measured by the voltmeter and a voltage setpoint, where during the voltage control mode a time-averaged current caused by the voltmeter through the connection is less than 5% of the time-averaged current through the ionization electrode, andan ionization current amplifier having an input connected in a sequence with the ionization electrode, the flame region and the grounded burner, the sequence connected in parallel with the voltmeter.