L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

Alain Cloarec

Robert Ian Taylor

Didier Pathier

The invention is a method for operating a cryogenic tunnel through which products to be chilled or deep-frozen pass. This tunnel is equipped with means for injecting a cryogenic fluid and means for extracting the cold gases in the tunnel. The method includes obtaining an entry or an exit gas temperature from a gas temperature probe outside the tunnel in proximity to the tunnel entrance or exit. The method also includes obtaining an ambient temperature from an ambient temperature probe located outside the tunnel. The method also includes determining a first delta which is the difference between the ambient temperature and the gas temperature. And the method includes controlling the extraction rate of the extraction means by feedback as a function of the the temperature difference between the first delta and a set point, in order to restore the value of the first delta to the setpoint value if necessary.

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Bois d'Arcy, France

Alain Cloarec