What is a good material for flue gas pipes?
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The main flue gas contains 2000 mg/Nm3 of nitric oxide, 153 mg/Nm3 of nitrogen dioxide, 695 mg/Nm3 of sulfur dioxide, as well as 10% water; the temperature is 160 degrees Celsius at normal pressure
Generally, thicker (greater than 10 mm) 20# carbon steel is used, with stainless steel being considered only in special cases.
It is recommended to use carbon steel, and there is no need to make it particularly thick. However, it is essential to ensure proper external insulation to prevent local temperatures from dropping due to external cooling, which could lead to condensation and corrosion. Be sure to purge with air or nitrogen when parking.
Carbon steel is generally chosen, with a lining inside.
This pipeline is used to connect the booster fan in the desulfurization and denitration process, and it needs to be corrosion-resistant.
There is water vapor inside; is carbon steel sufficient?
Both gases will form strong acids with water below their dew point, causing corrosion. But it has little corrosivity in high-temperature gaseous form. The temperature of 160°C is set to prevent dew formation. Ensure proper insulation to maintain the process temperature and prevent dew formation. Carbon steel should be fine.