Heat exchanger controls for low temperature fluids

Details Heat exchanger controls for low temperature fluids Heat exchanger controls for low temperature fluids

1996-03-26

1997-09-23

Kilner, Christopher

Refrigeration

Cryogenic treatment of gas or gas mixture

Automatic control

62618, 62183, F25J 300

Patent

active

056692382

ABSTRACT:
In a heat exchange scheme associated with a gas purification column in an LNG recovery process, in which heat exchange is desired between fluids of such widely different temperatures that thermal shock could result in damage to heat exchanger apparatus, a control scheme compensates for the effect of excessive temperature differential. The desired compensation is achieved by manipulating flow in a heat exchanger bypass conduit for the warm fluid to maintain a desired temperature ratio between the colder fluid entering the heat exchanger and the warmer fluid exiting the exchanger. Additionally, start-up controls for the column include temporarily selecting temperature of a cold stream to automatically control opening of a valve to initiate flow of the warm stream.

REFERENCES:
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patent: 3212278 (1965-10-01), Huddleston
patent: 3407052 (1968-10-01), Huntress et al.
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patent: 4185978 (1980-01-01), McGalliard et al.
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patent: 4430103 (1984-02-01), Gray et al.
patent: 4457768 (1984-07-01), Bellinger
Liptak, B.G. "Instrument Engineers Handbook", vol. II, pp. 48-49.
Liptak, B.G. "Instrument Engineers Handbook", vol. II, pp. 940-942.

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