Process for apparatus for cryogenic cooling using liquid carbon dioxide as a refrigerating agent
AssigneeSociete Industrielle de l'Anhydride Carbonique
InventorJoseph Castan
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Abstract
Cooling by carbon dioxide. The apparatus comprises: as an expansion member, at least one appliance (5) for the expansion and separation of the solid and gaseous phases, which is interposed between the pipe (3) and the chamber (4) and which has a gaseous-phase outlet and a solid-phase outlet communicating with the chamber via a sealing means (10), a gaseous-phase recovery pipeline (15) connected to the gaseous-phase outlet of the appliance (5), a compressor (16) fed by the recovery pipeline (15), and a means (17) for liquefying the gaseous phase for the purpose of re-using it. Application for the deep-freezing of food products.
Claims22
In a process for cryogenic cooling including the steps of expanding the liquid CO.sub.2 cooling agent in at least one expansion and separation appliance upstream and in the vicinity of an operating chamber, extracting the CO.sub.2 in solid form from the appliance to expel and disperse it into the chamber in a discontinuous manner, and returning the CO.sub.2 in its gaseous phase from the appliance to a tank via a reliquefaction circuit not connected to the atmosphere, the improvement being utilizing a pressure up to 5.18 bars for the expansion and separation, and extracting the gaseous CO.sub.2 between two phases of expulsion of the solid CO.sub.2 as a result of expansion inside the expansion and separation appliance.
Cryogenic cooling apparatus using liquid carbon dioxide as a refrigerating agent, of a type comprising a storage tank, a drawing-off pipe equipped with a regulating member leading from said tank to an operating chamber, characterized in that said apparatus comprises:
- as an expansion member, at least one appliance for the expansion and separation of the solid and gaseous phases, said appliance communicating with said pipe and with said chamber, said appliance having a gaseous-phase outlet and a solid-phase outlet communicating with said chamber via a sealing means,
- a gaseous-phase recovery pipeline connected to said gaseous-phase outlet of said appliance,
- a compressor fed by said recovery pipeline,
- and a means for liquefying the gaseous phase for the purpose of re-using it.
In an expansion and separation appliance for cryogenic cooling with liquid CO.sub.2 refrigerating agent in a system including a storage tank having a drawing-off pipeline leading to an operating chamber through said appliance, with said appliance being upstream of said operating chamber, said appliance separating said CO.sub.2 into a slid phase and a gaseous phase, said appliance communicating with a compressor and a reliquefaction circuit for returning the gaseous phase of the CO.sub.2 to said tank, the improvement being in that said appliance includes a cylindrical body having a lower frustoconical end, a transverse face closing said cylindrical body at its top end, a connection creating communication at said transverse face between the interior of said body and a recovery pipeline leading to said circuit, a connection piece tangentially communicating with the interior of said body, said connection piece having a sprayer within said body, said connection piece communicating with said drawing-off pipeline, and said frustoconical end having a sequentially opening sealing means.
Dependencies are inferred from the claim text.