METHOD FOR ELECTRONICALLY REGULATING A COMBUSTIBLE MIXTURE, FOR EXAMPLE GAS FED TO A BURNER

摘要

A method for regulating the combustible mixture such as air/gas, air/methane gas or the like fed to a burner, the method including measuring a flame signal correlated with the composition of the mixture fed by feed members controlled by a combustion controller arranged to regulate the combustion on the basis of the flame signal. During burner operation the mixture feed conditions are modified within a narrow time interval to obtain a flame signal variation; a ratio between values of this the flame signal at the end and at the beginning of the interval is compared with a predetermined reference value; and, on the basis of the deviation of this ratio from the reference value, the flame set point is regulated, as consequently is the air or gas of the mixture if this is rendered necessary.

主权项

1. A method for regulating the combustible air/gas mixture fed to a burner, said method of comprising:
measuring a flame signal correlated with the composition of said mixture, said air and said gas being fed by corresponding feed members, which are controlled by combustion control means arranged to control and regulate combustion on the basis of a working set point value of the flame signal, during burner operation modifying the mixture feed conditions within a narrow time interval to obtain a flame signal variation, wherein said narrow time interval is less than the time constant of the electrode-flame-burner-mixture system, a ratio between values of the flame signal at the end and at the beginning of said interval being compared with a predetermined reference value and, on the basis of the deviation of this ratio from said reference value, recalculating a new working set point value of the flame signal and, consequent on this recalculation, possibly regulating the mixture air or gas, with this new set point value there being compared a subsequent ratio between flame signal values obtained during a subsequent time interval in which the mixture feed conditions are again modified to control the combustion.