Abstract: A method and device for operating a cryogenic tunnel involving the implementation of the following provisions: the measurement of a plurality of key parameters of the method, the division of these parameters into two groups of different parameters, the implementation of one or both of the two following actions on these key parameters: Anticipation actions on the parameters of the 1st group (in order to act in advance on an anticipated/expected deviation in the deep-freezing quality; and Retroactive actions (countermeasures) on the parameters of the second group, in order to rebalance a measured, effective drift in the quality of the exiting products.

Abstract: A plant for grinding a product, which includes a grinder in which the product is ground, which plant also includes a hopper for supplying the grinder with product to be ground, configured to be supplied with product to be ground; a means for bringing a cryogenic fluid into the hopper; and a means for discharging product from the hopper into the grinder. Wherein the hopper is provided in a lower part with a hollow screw provided with turns allowing the product to be discharged out of the hopper, into the grinder; and the means for bringing a cryogenic fluid into the hopper comprise an injection lance which is positioned inside the turns of the hollow screw, extending in a direction substantially parallel to the axis of the screw.

Abstract: The injection device according to the invention, intended to be attached to the wall of the bottom of a container containing a product to be cooled in bulk, includes a hollow cylindrical body in which a valve forced by a spring is inserted, a throughchannel appreciably parallel to said valve intended to be fed by pressurized cryogenic fluid, one end of said through-channel being connected to the cryogenic fluid feed system and the opposite end opening into the seat of the valve.

Abstract: The invention relates to a method and equipment for filling at least one downstream tank with a cryogenic liquid, from an upstream store which contains, at a storage pressure above atmospheric pressure, the cryogenic fluid in the liquid phase at the bottom of the tank, and the cryogenic fluid in the gas phase at the top of the tank, said upstream store being suitable for feeding liquid withdrawn from the bottom of the store to the downstream tank, as well as to be supplied with fluid from the outside, characterized in that one generates and maintains a pressure difference between the upstream store and the downstream tank, by pressurizing the gas phase of the upstream store at a pressure that is greater than the equilibrium pressure of the store.

Abstract: The injection device according to the invention, intended to be attached to the wall of the bottom of a container containing a product to be cooled in bulk, comprises a hollow cylindrical body in which a valve forced by a spring is inserted, a through-channel appreciably parallel to said valve intended to be fed by pressurized cryogenic fluid, one end of said through-channel being connected to the cryogenic fluid feed system and the opposite end opening into the seat of the valve.