How to use liquid nitrogen in S&T heat exchanger
How to use liquid nitrogen in S&T heat exchanger
(OP)
Hi
I am new member and want to discuss one process development problem.
We are in the phase of developing some type of process to utilize excess liquid nitrogen to cool utility water. Can liquid nitogen be used to cool water from 110 degF to 41 degF in S&T type Heat Exchanger? Due to very low temperature of N2 i.e. -283degF, water in tubes of exchanger can freeze. Please help how liquid N2 can be utilized to cool water.
I am new member and want to discuss one process development problem.
We are in the phase of developing some type of process to utilize excess liquid nitrogen to cool utility water. Can liquid nitogen be used to cool water from 110 degF to 41 degF in S&T type Heat Exchanger? Due to very low temperature of N2 i.e. -283degF, water in tubes of exchanger can freeze. Please help how liquid N2 can be utilized to cool water.





RE: How to use liquid nitrogen in S&T heat exchanger
Although I can't say I've ever heard of excess liquid nitrogen.
RE: How to use liquid nitrogen in S&T heat exchanger
Therfore only oprtion is to use some S&T heat exchanger or some vertical tube vaporizer to cool water with out causing water freezing. Is there any one who did the same of type of study.How can I confirm that wich option is sutiable?
RE: How to use liquid nitrogen in S&T heat exchanger
cheers,
gr2vessels
RE: How to use liquid nitrogen in S&T heat exchanger
RE: How to use liquid nitrogen in S&T heat exchanger
Is there a cheap way to heat the cold nitrogen vapors before entering the water coolers ?
The overal heat transfer coefficient would be around 0.05 kW/(m2oC)
RE: How to use liquid nitrogen in S&T heat exchanger
If not, then direct injection of the LN into the cooling water is possible. And yes, people build equipment for this.
If you want to use a S&T HX then it needs to be designed like the LNG vaporizers. The LN will be tubeside, the units will sit vertical, and the tubing has to be an austenitic stainless. Which stainless depends on the water chemistry.
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Plymouth Tube
RE: How to use liquid nitrogen in S&T heat exchanger
RE: How to use liquid nitrogen in S&T heat exchanger
we purchase some liquid nitrogen for extreme cooling but would never consider it for cooling water. liquid N2 is too expensive/valuable.
RE: How to use liquid nitrogen in S&T heat exchanger
Use gaseous N2 to cool the water in a heat ex. Use liquid N2 to directl cool recycled gasous N2 to desired temp.
Although I would go for direct cooling with N2 into the water as suggested above is it's possible.
RE: How to use liquid nitrogen in S&T heat exchanger
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Plymouth Tube