How to reduce the oxygen content in a heating furnace?
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It is a cylindrical heating furnace; the oxygen content, as measured by the zirconia online analyzer, is around 7.5. All areas where air leakage occurred in the heating furnace have been thoroughly repaired, yet the oxygen content has still increased. There are two zirconia sensors, one in the convection chamber and another in the radiation chamber. I would appreciate it if my colleagues could help offer some suggestions and conduct an analysis! How can the oxygen content in the heating furnace be reduced?
Reduce the air supply to the burner, but try not to touch the air-fuel ratio valve
Check whether the set air-fuel ratio is too high; adjust it to an appropriate range to ensure proper air distribution.
To reduce the oxygen content in flue gas, where does the oxygen come from? One, there’s too much air for combustion. Two, the furnace is creating a suction effect (negative pressure)
To reduce the oxygen content, an excess of fuel gas can be used. Generally, the heat treatment furnaces and glass feeding systems we have used in the past employ a premixed combustion system. We have tested the oxygen content using smoke analyzers, and it can be reduced to below 1%. The main methods involve increasing the amount of fuel gas appropriately to create a slightly reducing atmosphere inside the furnace; another approach is to maintain a positive pressure inside the furnace, which prevents air from entering it. If you are using a internal mixing combustion system, it is not recommended to adjust the air-fuel ratio valve; instead, a fine-tuning valve can be added to the fuel pipeline to increase the fuel supply slightly, which will reduce the oxygen content.
Excessive gas, in my opinion, is not advisable, as poor control can lead to incomplete combustion, which is a waste of fuel! Of course, if the equipment is advanced and the control system is also advanced, then just ignore what I said