Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1999-01-06
2000-12-05
Doerrler, William
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62657, F25J 102
Patent
active
061550779
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a method for condensation of a gas with several fractions.
DESCRIPTION OF THE BACKGROUND ART
It is assumed that such a method is generally known per se, but there is a possibility of employing it in connection with transport of oil by means of tankers, and more specifically during the loading thereof. In the case of such an application, which can be regarded as novel, however, the non-condensed fractions would be released directly into the open air from the first passage of the first heat exchanger. Since refrigerating energy has also been used for cooling of these fractions, the energy which has been employed for cooling these fractions is thereby lost.
Similarly, particularly in the case of the above-mentioned application, in order to provide the refrigerated coolant, a known per se cooling plant can be employed with a capacity which is adapted to the cooling capacity which has to be produced during the condensation. The plant therefore has to be relatively large and thus space consuming and expensive. Since the cooling plant is only used during the oil loading, for economic reasons it is stopped while the ship is underway. The short operating time of the cooling plant in relation to the long period during which it is not in operation is a contributing factor to its unsatisfactory utilization.
SUMMARY OF THE INVENTION
The object of the invention is to provide a method of the type mentioned in the introduction, whereby the above-mentioned drawbacks can be avoided.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawing which is given by way of illustration only, and thus is not limitative of the present invention.
The invention will now be described in more detail with reference to the drawing whose single FIGURE is a schematic block diagram illustrating a device for implementing the method according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As illustrated in the figure the device comprises a pipe 2 via which, e.g., a gas containing several fractions, at least some of which have to be condensed, is passed to a first heat exchanger 4. This heat exchanger 4 may comprise in the known manner a first passage 6 which is composed, e.g., of an inner space in a housing 8 of the heat exchanger 4, and a second passage 10, which is composed of a pipe or the like which extends in the inner space.
A coolant is supplied via a supply pipe 12 to the second passage 10 of the heat exchanger 4 from a cooling plant 14 and passed back to the cooling plant 14 via a return pipe 16. The cooling plant 14 comprises a refrigerating machine 18. In the supply pipe 12 there is provided between the refrigerating machine 18 and the first heat exchanger 4 a storage tank 20 for refrigerated coolant, and in the return pipe 16 there is provided a return tank 22 for heated coolant, i.e. coolant which has been used for cooling in the heat exchanger 4.
Gas fractions which have been condensed in the first heat exchanger 4 are passed to a collecting tank 24 from this heat exchanger 4 via a pipe 26.
Gas fractions which have not been condensed in the first heat exchanger 4 are passed via a pipe 28 to a second heat exchanger 30. Like the first heat exchanger 4 this heat exchanger 30 has a first passage 32 which is composed of an inner space in a housing 34 and a second passage 36 which is composed of a pipe or the like which extends in the inner space.
The pipe 28 communicates with an inlet en
REFERENCES:
patent: 4142876 (1979-03-01), Zahn et al.
patent: 4172711 (1979-10-01), Bailey
patent: 5473900 (1995-12-01), Low
patent: 5476986 (1995-12-01), Jacobsen
Bakke J.o slashed.rund
Rummelhoff Carl J.o slashed.rgen
Doerrler William
Drake Malik N.
Kvaerner Maritime AS
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