There is a significant difference between the actual flue gas volume in the heating furnace and the design value
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The atmospheric and vacuum distillation unit is equipped with two heating furnaces. The designed flue gas volume is 2.5 million cubic meters per day, but actual measurements show around 6 million cubic meters per day – a significant difference. However, our actual operating parameters are a furnace negative pressure of -10 pascals and an oxygen content of about 2%, with no obvious signs of air leakage. What could be the reasons for such a large discrepancy?
How is it measured? Methods and tools?
Measure the smoke flow velocity and multiply it by the cross-sectional area.
Is the design value the flow rate under standard conditions or the flow rate under operating conditions? If it’s at standard conditions, temperature compensation is required
Thank you; the effect of temperature has been taken into account, but the actual value is still much higher than the designed value.
Has the actual operation met the heat load under the designed operating conditions?
The flow of flue gas in the flue is not an ideal laminar flow, so the error resulting from multiplying the flow velocity by the cross-sectional area is quite large.
Have there been significant changes in the fuel composition and design?
Has it been considered whether the flue gas is dry or wet?