Turbo-Expanders for cold production and energy recovery booklet
16Pages

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY Everywhere in the GAS SUPPLY CHAIN Innovation for CONTINUOUS EXPANSION

Cryostar – turbo expander expertise for the gas supply chain in natural gas processing and petrochemical applications For more than 30 years Cryostar has been recognized as a world leader for their superior product quality in radial inflow turbine technology, pumps, LNG boil off gas compressors and air separation. Since Cryostar began in 1966 and followed with the production of their first turbine in 1974, their focus and expertise has been to provide their customers with turbo-expander/compressor and energy recovery systems for cold production and liquid recovery with the highest...

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY The key advantages of Cryostar Cryostar: the pioneer company in active magnetic bearings expander with an unequal experience ● Cryostar was the first company to develop an expander equipped with active magnetic bearings (AMB) in 1988. ● Cryostar was the first company to supply 8 AMB expanders for natural gas processing (offshore conditions in the North Sea environment) ● Cryostar has the largest base of expanders equipped with AMB in operation in the world ● Proven expertise of applications: dew point control, ethane recovery, NGL...

Cryostar provides the best configuration to match to the application Cryostar designs all their turbo-expander packages to the strictest of industry and client requirements. Compliance to API 617 is standard and in addition, each machine can be fully customized to meet even the most stringent of client requirements. To assure customers on-time delivery to the agreed specification level, an engineering team is selected at the beginning of each project. The team includes of aero-designers, specialists in rotating machinery, instrumentation and control systems, seal gas and lube oil systems...

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY General principle of cryostar hydrocarbon turbo-expander equipped with oil lubricated bearings 1 ● Expander casing Designed and built under ASME specifications Hydrostatic test at 1.5 times the MAWP Material selected as per the application 5 ● Labyrinth seals Very safe and reliable system 6 ● Bearings Combined radial tilting pad and axial tapered land bearing Maximum stability and reliability 2 ● Expander wheel Open/closed 3D wheel High efficiency up to 92% Milled from solid Heat treatment for maximum strength and durability Material:...

Inlet guide vanes adjusting mechanism – variable flow nozzles For efficient flow control the expander is equipped with a variable inlet guide vanes assembly. Cryostar expander variable inlet guide vanes are designed to provide zero by-pass losses (no loss of efficiency), precision movement control and high efficiency over a wide operating range. Similar to the wheel design, extensive use is made of superior computer programs for the optimization of the nozzle shapes. It allows the optimal design of the vanes and limits the size of the actuator. Preconditioned materials, matched clearances...

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY Connections between wheel and shaft: innovation for reliability and efficiency Cryostar has developed a special connection between shaft and wheels: the Hirth connection. It offers a superior moment transfer. This connection is a method that yields excellent results for balancing. It is especially adapted for high power and high tip speed applications. Shaft seal system Cryostar can provide different types of shaft seal arrangement depending on the application and client requirement. They are suitable for atmospheric or pressurized...

BEARINGS: conventional type (oil lubricated bearings) or active magnetic bearings? Active Magnetic Bearings: not only the solution to decrease the dimensions and weight of the machine (no lube oil system) but also a package with three key advantages: ● no risk of process contamination by oil. ● elimination of vibration: the active bearings cancel synchronous vibrations by letting the shaft free to rotate around its inertia axis. ● no maintenance concept. Cryostar has been the first company to develop and to implement AMB on expander/compressor used in natural gas processing. Electromagnets...

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY AROUND THE EXPANDER: an oil lubrication system (applicable for compressor loaded expander or generator loaded or oil brake loaded expander) The oil lubrication system is dedicated to ensure a proper and continuous lubrication of all bearings and gears of the machine. Cryostar is able to provide simple and low cost oil lubrication system but also some optimized systems designed as per API 614 standard, latest edition. These systems meet the most stringent technical requirements in term of selection of equipments, materials and test to...

Control system of turbo-expanders Cryostar turbo-expanders can be built with simple or very sophisticated control systems, standard or fully customized. The control system can be installed locally on the skid or can be remote for installation in the control room for instance. In case the client requires the possibility to achieve a local control (local start/stop…) a combination is also possible. The control system may include a PLC (programmable logic controller) which is often redundant with dedicated visual display unit so as to provide all the necessary information for a safe operation....

TURBO-EXPANDERS FOR COLD PRODUCTION AND ENERGY RECOVERY TECHNOLOGICAL EVOLUTION: The latest technology to design your turbo-expander During recent years, technological advances have provided modern high tech tools and they have drastically changed the way Cryostar designs its equipment. Cryostar has invested in the latest technology to support the expertise and shorten its response time. Cryostar employees use state-of-the –art tools through the entire process. ● Computer Aided Design/Computer Aided Manufacturing [CAD/CAM] systems are used across the entire design and production process. ●...