Freezer and plant gas system

A cryogenic treatment process comprising the steps of

• directing a liquid cryogen from a liquid storage tank to a freezer adapted to receive a load of material,
• expanding the liquid cryogen to a gas in an evaporator located within the freezer,
• cooling the interior of the freezer, and
• injecting liquid cryogen into the interior of the freezer exterior to the evaporator.

A plant gas system comprising

• a liquid cryogen storage tank,
• a freezer comprising a first evaporator located within said freezer, said freezer and first evaporator being in communication with said liquid storage tank, wherein said freezer is remotely located relative to said liquid storage tank,
• a gas reservoir in communication with said first evaporator,
• a second evaporator connected in series with said first evaporator, said second evaporator being located external to said freezer, and
• third evaporator in communication with said liquid storage tank and said gas reservoir and bypassing said freezer.

A plant gas system comprising

• a liquid cryogen storage tank,
• a freezer comprising a first evaporator located within said freezer, said freezer and first evaporator being in communication with said liquid storage tank,
• a gas reservoir in communication with said first evaporator, and
• a liquid load basket in communication with said liquid storage tank.

A cryogenic treatment process comprising the steps of

• directing a liquid cryogen from a liquid storage tank to a freezer
• expanding the liquid cryogen to a gas in an evaporator located within the freezer,
• cooling the interior of the freezer,
• placing a load of material into the freezer,
• pre-cooling the load of material, and
• cooling the load of material further with the liquid cryogen.

A plant gas system comprising

• a liquid cryogen storage tank,
• a freezer comprising a first evaporator located within said freezer, said freezer and first evaporator being in communication with said liquid storage tank, wherein said freezer is remotely located relative to said liquid storage tank,
• a gas reservoir in communication with said first evaporator, and
• a second evaporator connected in series with said first evaporator, said second evaporator being located external to said freezer.