What material should be used for the heat exchange tubes in the tube side of low-temperature frozen brine?
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Please, experts, feel free to share your opinions. .
Carbon steel is sufficient for the heat exchange tubes in low-temperature frozen brine systems.
Carbon steel is generally used, as it is a cost-effective option when all factors are taken into consideration
What material is on the other side? Carbon steel is generally used.
I have just built a fixed-tube-sheet heat exchanger. The fluid in the shell side is chilled brine, with an operating temperature of -15/–10°C; the fluid in the tube side is a brine solution, with an operating temperature of -10/5°C. The material used for both the shell and the tubes is S31008.
The frozen saline I used before had calcium chloride as its main component, and all the pipes were made of carbon steel. Austenitic steel is definitely not usable. However, carbon steel seems to corrode quite severely as well.
Reply to 5# lucyxx: This device won’t last long. I saw one that used saltwater as well; it used a 310, and in the end everything broke
Reply to 7# penryn: We are carrying out equipment upgrades. For the users’ existing equipment, with the same parameters, two units use S32100 as the material, while the other two use S31008. They have mentioned that S31008 is a better material and requested that we change the original material from S32100 to S31008. Please discuss further to determine which material would be the best choice.
Low-temperature cryogenic saline is generally at -15 degrees or other temperatures; carbon steel is usually sufficient for use, as it is cost-effective and durable, capable of lasting for several years； In the event of corrosion and leakage, it is necessary to check whether corrosive substances have entered the chilled brine used by various users. Under normal conditions, chilled brine should not cause the heat exchanger to corrode and leak so quickly.