What is the most appropriate way to make adjustments when the furnace flame in a converter shows the following conditions?
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Flames licking the furnace tubes? Is the furnace chamber hazy like water vapor? Is the flame too long? What is the structure of the burner, anyway? How to adjust the main air, primary air, and secondary air?
First, it is necessary to understand the functions of primary air and secondary air: primary air is mixed with the fuel, while secondary air is used for combustion. The flame is supposed to be short, with a uniform shape and a strong, straight appearance. If the flame spreads along the tube or appears uneven, it indicates a problem with the premixing, and it is necessary to adjust the air supply in order to control the flame ； An excessively long flame may also be caused by a high fuel flow rate or excessive negative pressure. Flame adjustment must be precise and meticulous; the amplitude of adjustment should not be too large. When making adjustments, the primary and secondary air valves also need to be adjusted accordingly – it’s not sufficient to adjust just one of them. Of course, it is necessary to constantly monitor the temperature of the furnace, the negative pressure, oxygen levels, and the condition of the flame during the adjustment process
A lack of clarity inside the furnace is likely due to insufficient air supply. The length of the flame can be adjusted using the dampers; a too-long flame may be caused by an excess of fuel or by insufficient air supply. The flame touching the furnace tubes might be due to insufficient negative pressure or again, to inadequate air supply