Flue Gas Acid Dew Point Calculator
Compute sulfuric acid dew point temperature (ADPT) from fuel sulfur, moisture, and SO3 concentrations using the Verhoff-Banchero correlation to prevent cold-end corrosion.
Fuel & Combustion Chemistry
Acid Dew Point Results
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Frequently Asked Questions
What is the sulfuric acid dew point in flue gas?
The acid dew point is the temperature at which minute traces of sulfur trioxide (SO3) and water vapor in flue gas combine to condense as liquid sulfuric acid (H2SO4). While pure water vapor condenses around 120°F to 135°F, even 10 ppm of SO3 elevates the acid dew point to between 250°F and 300°F.
Why is the Verhoff and Banchero correlation widely used in boiler engineering?
The Verhoff-Banchero equation accurately models the thermodynamic chemical equilibrium between H2O, SO3, and liquid H2SO4 across industrial flue gas partial pressures, allowing plant engineers to calculate minimum safe metal temperatures for economizers and air preheaters.
How can cold-end acid corrosion be prevented in boiler economizers?
Methods include using a deaerator to preheat incoming feedwater above 220°F before it enters economizer tubes, recirculating hot water back to the economizer inlet, firing low-sulfur fuels, or injecting magnesium oxide / lime sorbents to neutralize SO3.