【Q&A Question 133】2016.08.31
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【Q&A Question 133】August 31, 2016: What are the measures to prevent and reduce dew point corrosion in heating furnaces? The answer key can be seen after responding; scoring is based on identifying the key points. 1. Increase the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. 2. Use corrosion-resistant materials. 3. Employ low-oxygen combustion, control the excess air amount in combustion, and reduce the generation of SO3. 4. Use low-sulfur materials to lower the flue gas dew point temperature and minimize low-temperature corrosion.
1. Increase the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surface during design. 2. Use corrosion-resistant materials. 3. Use low-oxygen combustion to control the excess air in combustion and reduce the generation of SO3. 4. Use low-sulfur fuel to lower the flue gas dew point temperature and reduce corrosion at low temperatures
First, increase the air temperature at the inlet of the air preheater or control the wall temperature of the heat exchange surface during design； Second, use corrosion-resistant materials ； Third, low-oxygen combustion is used. Fourth, use sulfur-containing fuel gas as little as possible or avoid it altogether.
Increase the flue gas temperature to keep it above the dew point for corrosion, and use gas with a low sulfur content!
Increase the air supply volume and raise the smoke exhaust temperature
First, control the flue gas emission temperature, and second, ensure complete combustion of the fuel gas.
Use low-sulfur fuel； Use duct materials made of ductile iron or aluminum-coated materials to improve performance ； Adopt a new type of burner
Use clean fuels to reduce the sulfur compound content in flue gases, strictly control the flue gas temperature, and employ equipment made of corrosion-resistant materials
①Increase the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surface during design； ②Use corrosion-resistant materials ； ③Low-oxygen combustion is employed to control the excess air in combustion and reduce the generation of SO3 ； ④Use low-sulfur fuel to lower the flue gas dew point temperature and reduce corrosion at low temperatures.
1. Increase the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. 2. Use corrosion-resistant materials. 3. Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. 4. Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
What are the measures to prevent and reduce dew point corrosion in heating furnaces? 1. Increase the flue gas temperature. 2. Reduce the sulfur content of the fuel