| 摘要 |
The invention relates to a method of operating a furnace (1) comprising a flue pipe (11) for discharging the smoke, means (19) of introducing ambient air into the said flue pipe (11) and a smoke extractor (16) arranged in the said flue pipe (11). According to the method, the temperature of the smoke is measured at two points (31, 33), the temperature measured at the second point (33) is subtracted from the one measured at the first point (31), the result of the subtraction is compared with a datum value DELTAT, and the ratio of the flow rate of fuel to the flow rate of oxidizing agent introduced into the furnace (1) is decreased when the result of the subtraction is below the datum value DELTAT.
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