Acid Dew Point Calculator
Catalyst type
i
Different catalyst types have different SO₂ to SO₃ conversion rates. This affects the acid dew point calculation.
SCR (Selective Catalytic Reduction)
Dust/Precipitator
Custom conversion rate
SCR typically has 1-2% conversion, dust/precipitator has 0-0.5%
SCR (Selective Catalytic Reduction)
SO₂ concentration
i
Sulfur dioxide concentration in the flue gas. Higher values increase acid dew point.
ppm v/v (typical range: 500–2000)
Water vapor in flue gas
i
Water vapor content affects condensation conditions. Higher water content raises the acid dew point.
40
%
% volume (usually around 30–60%)
Gauge pressure
i
System operating pressure affects partial pressures of gases. Higher pressure raises dew point temperature.
750
mmWC
mm water column (500–1000 is common)
SO₂ → SO₃ conversion
i
Percentage of SO₂ that converts to SO₃. Higher conversion rates significantly increase acid dew point.
1.5
%
1–2% for SCR, 0–0.5% for dust
Safety margin for steel
i
Temperature added to the calculated dew point to ensure safe operation. Higher margin increases safety but may require more energy.
15
°C
Temperature margin (defaults to 15°C)
O₂ content (optional)
i
Oxygen percentage in flue gas can affect SO₂ to SO₃ conversion rates (optional parameter).
6
%
% volume (typical 3-10% in combustion)
Calculate
Results
—
Acid Dew Point (°C)
—
Acid Dew Point (°F)
—
Safe Temperature (°C)
—
Safe Temperature (°F)
Dew Point vs. H₂O & SO₃ Conversion
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