Combustion – Timer – programmer – retarder or condition responsive control – With test circuit checking or analyzing flame sensing...
Patent
1997-05-02
1999-05-04
Yeung, James C.
Combustion
Timer, programmer, retarder or condition responsive control
With test circuit checking or analyzing flame sensing...
431 12, 431 78, F23N 102
Patent
active
058996834
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.
REFERENCES:
patent: 2324821 (1943-07-01), Campbell
patent: 4588372 (1986-05-01), Torborg
patent: 4859171 (1989-08-01), Altemark et al.
patent: 5049063 (1991-09-01), Kishida et al.
patent: 5472337 (1995-12-01), Guerra
Bredemeier Eckart
Herrs Martin
Merker Roland
Nolte Hubert
Schwedler Norbert
Stiebel Eltron GmbH & Co. KG
Yeung James C.
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