Air preheater put into operation
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What is the sequence of commissioning and the reasons for the air preheater in the heating furnace, the exhaust fan (for flue gas), and the blower (for air)?
Generally, the induced draft fan is turned on first to maintain a negative pressure in the heating furnace; this also removes explosive gases from furnaces that use oil, gas, or coal powder, thereby preventing the dangers associated with explosions within the furnace； At the same time, the air preheater also starts to operate ； To light the furnace, a fan must be started for furnaces that require ventilation.
I think one should first start the induced draft fan, then the blower, and at the same time activate the air preheater. Once the negative pressure in the furnace is stable and the oxygen level as well as the levels of combustible gases are within acceptable limits, ignition can take place. Additionally, the air preheater can be put into use selectively at the initial stage based on the temperature rise in the converter; once the converter is operating normally, the amount of combustion air fed into the furnace can be adjusted accordingly according to the temperature of the flue gas.
Is it the same as the sequence of putting the heat exchangers into use?
First, start the induced draft fan to replace the air in the furnace, then turn on the blower; after replacement, once the negative pressure meets the requirements, ignite the furnace.
Exhaust fan, supply fan, air preheater. Exhaust fan, to remove hazardous gases.
Hello, first of all, with the introduction of the exhaust fan, could the prolonged low-temperature condition of the flue gas during the heating process of the furnace lead to dew point corrosion in the furnace?