A liquefaction system produces a liquid product stream from a warm gas feed stream. Cryo Technologies has experience liquefying most industrial gases including helium, nitrogen, hydrogen, and natural gas. The feed gas is cooled from ambient temperature to final product temperature by work expansion of a recycle stream across a turboexpander or an expansion engine. Joule-Thomson expansion and cooling with an external refrigerant may also be used to provide refrigeration. A complete liquefaction system typically includes recycle compression and oil removal, a vacuum cold box containing valves, heat exchangers, adsorbers, expanders, product storage and distribution, and controls.
The net refrigeration requirements for a liquefier are much higher than for a refrigerator of comparable recycle flow. Therefore, a liquefier will have higher expander power and will often include more expanders to improve process efficiency. Use of an external refrigerant is quite common in liquefier applications since it will reduce the recycle flow requirements up to 75%.
It is typical for the feed stream to contain minor amounts of contamination which will be continually introduced to the system. A liquefier will often incorporate dual adsorber beds at one or more temperature levels, depending upon the application and the impurities to be removed
Cryo Technologies provides liquefiers in the range of 25 l/hr to over 2500 l/hr
Units can be designed with or without liquid nitrogen pre-cooling depending upon the availability and cost of liquid nitrogen
Computer control is standard, and systems are automated in accordance with customer preferences, including fully automatic start-up and shutdown where applicable
We are familiar with the unique dynamic behavior of storage tanks and transport containers and account for this in our designs so that our systems are stable and efficient across a wide range of cold end conditions.