Corrosion in CO2 regeneration tower
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The CO2 regeneration towers used in our plant’s benzophenone decarboxylation solution for hydrogen production have experienced top corrosion after several years of use. I would like to ask experts about the mechanism of this corrosion and the preventive measures that can be taken. This post was last edited by brainandrain on 2009-3-24 11:17.]
First, it is necessary to understand the working mechanism of the CO2 regeneration tower. The top of the tower is the area with the highest concentration of CO2, in a wet environment. CO2 + H2O = H2CO3, which can easily cause corrosion to equipment. A better approach is to replace the equipment materials with 304. This post was last edited by lxzzl on 2009-3-27 09:37.]
We use 316L material for the MDEA CO2 removal and regeneration towers
The corrosion mechanism is as mentioned on the second floor; anti-corrosion measures can involve using stainless steel equipment, or to save costs, only the upper part can be replaced with stainless steel.
Changing the material is one solution, but the root cause of this problem is likely that the performance of the packing in the CO2 absorption tower no longer meets the process requirements.
If it is merely carbon dioxide corrosion, 16MnR can address the corrosion issue; it is a cost-effective solution. Using grade 20 steel with an increased wall thickness ensures sufficient margin against corrosion. Regular inspections are needed each year to check the degree of corrosion, and in cases of severe localized corrosion, surfacing and annealing can be carried out. Of course, these measures also depend on the operating pressure – since the regeneration pressure should not be high, this should suffice to solve the problem. Last edited by guren6 on 2009-4-6 15:13.]
The packing can no longer perform as intended. It is recommended to replace it.
I’m not quite sure about the view from above; it has nothing to do with the packing in the absorption tower, right? Tower corrosion – \"The glass supplier hopes that the customers’ glass will break every day\"; such an attitude is not good and does not reflect professionalism or dedication. I don’t think it’s a problem with the filler.