Corrosion prevention using flue gas to spray NaOH solution
Thread Content
This post was last edited by xswxy0516 on 2019-6-21 at 17:08. As the title states: NaOH solution (with a concentration of less than 10%) is sprayed into flue gas at 200–260°C to remove SO2 and HCl, after which the temperature is reduced to 150°C until the solution has completely evaporated. How should corrosion protection for the reaction tower and flue ducts be addressed? This is to remove SO2 and HCl from the flue gas; the flue gas then passes into PTFE-lined bags. The evaporated NaOH enters these bags along with the dust to continue reacting, which may result in a high-temperature, high-concentration NaOH solution. How can corrosion be prevented in such situations? Also, if the evaporated NaOH adheres to the surface of the flue, will it cause corrosion problems?
Where are the people? Where have the experts gone? Please, an expert, come and answer this
Where are the people? Where have the experts gone? Some expert please come and answer it :)
Where are the people? Where have the experts gone? Some expert please come and answer it :)
Spraying NaOH solution (with a concentration of less than 10%) into flue gas at 200–260°C to remove SO2 and HCl, followed by cooling the gas to 150°C until the solution is completely evaporated, is either extremely difficult or results in incomplete reaction between SO2 and HCl and NaOH. At present, it is likely that no one can meet these requirements.
I agree with what was said above; currently, people are trying to use this component
If there is complete reaction, there will be no corrosion, and there will be no excess of NaOH. This is to remove part of the acid so as to meet the emission standards. There is a cloth bag at the back, and the reaction continues completely inside that bag; as a result, an area with high concentrations and high temperatures of NaOH is formed. Therefore, it’s not clear how to address this issue in terms of corrosion prevention