Selection of the surface quality of the heat exchange tubes in the high-pressure ammonium methoxide condenser of the CO2 stripping unit
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In CO2 stripping units, the heat exchange tubes of the high-pressure ammonium methoxide condenser are prone to tube stress corrosion cracking at a distance of about 800 mm from the upper tube sheet. To control this phenomenon, in addition to controlling oxygen and chloride ions at the process level, I believe attention should also be paid to the surface quality of the heat exchange tubes: the better the surface quality, the less likely stress corrosion cracks will occur. Therefore, I think it would be better to use tubes that have been ground or polished (from the types of finished products specified in DIN17458) when installing new equipment! Has anyone chosen this approach in actual use? Which type is generally chosen? In particular, does anyone among you work for Dalian Jinzhong? You manufacture such equipment in the largest quantities – what type of pipes do you usually use?
What the original poster said makes sense, but the most important thing during the production process is to strictly prevent chlorides from entering and to improve water quality management. In general high-pressure ammonium methoxide condensers, the main cause of stress corrosion at the upper part of the heat exchange tubes is still the accumulation of chloride ions.