>>> CRYOSTAR Expanders. For Air Separation. History & Capabilities. The beginning Cryostar started to build expanders back in 1973 driven by engineers having gathered broad experience in their former companies:
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For Air Separation
Shaft powers from less than 1 kW are available up to the maximum ever operated for air separation !
The ECO- family is used in a process where the shaft power is absorbed by an oil brake. It covers the low end range of expanders, mostly for small N2/O2 generators.
Over 350 units are in operation all over the world.
Units are highly standardized with most of our customers and thus, permits low costs for a rugged and reliable expander.
The TFC range is coupled with a cold compressor beneath the oil brake.
Shaft powers from less than 1 kW up to typically 70kW are available.
ECO 70 cut-out model (Inlet guide vanes are missing).
The TP family covers the higher end of oil brake expanders. Various brake configurations and casings for higher pressures can cope with a large range of process conditions.
These units are custom-designed to ensure best fit of process requirements.
High degree of flexibility allow their use in various conditions:- A double shaft seal permits a safe separation between process and oil system even with higher process pressures.
With the TC family, the shaft power is recovered by a compressor on the same shaft.
A very large range of pressures, flows and shaft powers are available to best fit your process conditions.
These units are designed with highest efficiencies to provide their operators with a very high pay-back and the highest availability to limit the downtime as much as possible.
You will find these expanders in most of the modern air separation plants all over the world.
TC 120 with its modular oil system
The TG family converts the shaft power into electrical energy which is returned to the electrical grid.
Due to very high efficiency and stable shaft speed (locked by the mains frequency), these units are very reliable and energy efficient. They are in operation where a booster compressor is not adequate for the chosen process.
Cryostar has a large range of flow and shaft powers in operation with most of the world gas companies.
Two stages generator braked units
Back in 1985, Cryostar made the first tests with liquid expanders. The first unit was build the same year, based on a “Pelton” type of wheel.
In 1986, a high efficiency liquid expander was build, based on a “Francis” wheel which has proven its efficiency, flexibility as well as its reliability.
Cryostar has now a full range of liquid expanders in operation with oil brake for small shaft powers or with generator brake for larger units.
Cryostar is having by far the most & best experience with these “money makers”.
Liquid turbine during test with large N2 pumps
More than 1000 expanders have been delivered from 1983 up to end 2003.
Cryostar was ever on the foreground and was watching for new applications to best serve its customers with innovative solutions. Here a few examples:
The one example is the liquid turbine, but there are more configurations developed and build by Cryostar to suit new customer processes.
The MTMC 120 was developed to have about 30 kW on turbine whereas the compressor needed 70 kW shaft power, the remaining power being provided by a high frequency motor.
The TFC was developed with a cold compressor on the same shaft as well as an additional oil brake to extract energy from the process.In the mean time, three sizes are available: TFC 70, TFC 120, TFC 200.
The Bloweco was developed with ceramic ball bearings and blower brake, there are units in operation since 1998 without any maintenance.
Whether you have a project with a new process: ask Cryostar, the necessary machine may already exist or can be build !
All steps are performed to ensure highest efficiency in combination with the longest life time and minimum down time.