Dual-zone boiling process

Heat exchange – Regenerator – Checker brick structure

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165133, 165146, 165911, 62 52, 122367C, F28F 1318

Patent

active

046535721

ABSTRACT:
The invention relates to a process and apparatus for boiling flowing liquid such as liquefied gases in a heat exchanger in which a circulating flow is occuring, such as in reboiler-condensers in air separation and similar cryogenic plants or other applications where a high efficiency for boiling heat transfer is beneficial. The important feature of the process and apparatus is the use of two sequential heat transfer zones having different pressure drop and heat transfer characteristics in the same boiling channel, the first zone having a higher pressure drop and high convective heat transfer characteristic and the second zone having a lower pressure drop and an enhanced nucleate boiling heat transfer characteristic.

REFERENCES:
patent: 3214926 (1965-11-01), Shaievitz et al.
patent: 3457990 (1969-07-01), Theophillos et al.
patent: 3630276 (1971-12-01), Paine et al.
Chu and Sealy, Snap-On Nucleate Boiling Premeter, I.B.M. Technical Disclosure Bulletin, 8-3-68.
O'Neill & Gottzmann, "Improved Air Plant Main Condenser", Union Carbide Corp.

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