Process and apparatus for a cryogenic tunnel, and associated...

F - Mech Eng,Light,Heat,Weapons – 25 – D

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F25D 3/11 (2006.01) F25D 29/00 (2006.01)

Patent

CA 2479369

According to the inventive method for the operation of a cryogenic tunnel (1) fitted with means (2) for injecting a cryogenic fluid and means for variable-rate extraction (3) of cold gases, at least one temperature probe (21,22) which is located outside the tunnel (1) close to the entrance and/or exit thereof and able to provide a value T (input/output) of the temperature of the gases and at least one second temperature probe (23) located outside the tunnel and able to provide a value T (amb) of the ambient temperature of the premises wherein the tunnel operates are provided and the difference T (amb input/output) is determined between the ambient temperature T (amb) and the temperature T (input/output) which is compared to a predetermined setpoint valueT<o (>amb<->input/output) in order to act retroactively, according to the result of said comparison, on the rate of extraction of the extraction means (3) in order to establish, if necessary, the value of said temperature difference with regard to the setpoint value T<o> (amb<->input/output).

Selon ce procédé de conduite d'un tunnel cryogénique (1), équipé de moyens d'injection (2) d'un fluide cryogénique ainsi que de moyens d'extraction (3) à débit variable des gaz froids, on dispose d'au moins une sonde de température (21, 22) située à l'extérieur du tunnel (1) à proximité de son entrée et/ou de sa sortie, apte à fournir une valeur T (entrée/sortie) de la température des gaz ainsi que d'au moins une sonde de température (23) située à l'extérieur du tunnel (1) apte à fournir une valeur T (amb) de la température ambiante du local où fonctionne le tunnel (1) et l'on détermine la différence T (amb- entrée/sortie) entre ladite température ambiante T (amb) et ladite température T (entrée/sortie) que l'on compare avec une valeur de consigne prédéterminée To (amb-entrée/sortie) , pour retroagir, en fonction du résultat de cette comparaison sur le débit d'extraction desdits moyens d'extraction (3) afin de rétablir si nécessaire la valeur de ladite différence de température au niveau de ladite valeur de consigne To (amb-entrée/sortie).

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