ORC TURBO EXPANDER 245 download PDF

 

The present turbo expander was designed for ORC applications, in particular to be used with R245 fa, but capable to capable to be used with other process fluids such as natural Gas, in particular when expansion of high pressure gas is desired. The systems designed by TecnoVeritas are capable of recovering heat and transforming it into electricity, from any temperature down to 37ºC in South of Europe or even lower temperatures down to 15.3 ºC.

TecnoVeritas can provide all the Rankine cyle design and project implementation on site. Some of the smaller models (<250 kW) can be delivered inside a 40ft marine container, including heat exchangers and a control room, being only required cooling water connections, and 400 Volts power connection.

 
 

The Turbo expander 245 is a machine, which converts kinetic energy into mechanical energy. This is done by expanding the high pressure gas from upstream to a lower pressure downstream through the expander. The high pressure gas causes the radial expander to rotate. Rotation is transmitted to the shaft, coupled to the gear box and alternator.

Each machine is customized to attend the specific requirements, for example expander wheel is optimized for optimum efficiency. The system and controls are built per the customer’s requirements. TecnoVeritas tests all their expanders therefore allowing to machines with maximised efficiencies.

Expander and Compressor Wheels:
The expander wheel is manufactured from a solid forging. Each forging is ultrasonically inspected and a test specimen is taken from each forging and checked for mechanical properties prior to manufacturing of the wheel. Each wheel is designed for a specified set of operating conditions. Several parameters such as, specific speed, power, shaft speed and efficiency are considered on each project.For special projects Computational Fluid Dynamics studies are performed to enssure an optimum design.

Shaft Seals:
Turbo 245 primarily is equipped with dry gas shaft seals for use on our machines. Seal gas is injected into a port on the stationary seal close to the expander wheel. Some of the gas flows towards the expander wheel to prevent cold process gas losses. The remainder of the gas flows to the bearing cavity to prevent oil from entering the process gas. This gas is then vented to atmosphere through the mist eliminator on the lube oil system.

Controls:
Most systems of today are designed to interface with the customers DCS or PLC. Therefore TV designs controls to provide an easy integration into monitoring and the customers controls.
In the expanders having nozzle rings with inlet guide vanes with pneumatic actuator an I/P transmitter is supplied to accept a customer 4-20 ma signal for full throtle stroke.
A locally mounted emergency STOP pushbutton is supplied mounted on the control cabinet

Monitoring Process Variables Standard:

  • Expander reference pressure
  • Oil Reservoir temperature
  • Oil pump discharge pressure
  • Oil supply temperature (after oil cooler)
  • Oil supply pressure
  • Lube Oil Flow indicator

Alarms:

  • Expander bearing temperature (with spare Pt100)
  • Compressor bearing temperature (with spare Pt100)
  • Over speed
  • Low Oil Pressure
  • High vibration
  • Shutdowns:
  • Expander bearing temperature (with spare Pt100)
  • Compressor bearing temperature (with spare Pt100)
  • Over speed / Low speed trips
  • Low Oil Pressure
  • High vibration
  • Other additional monitoring, alarms & shutdowns can be provided, or a complete local control panel as required by customers specifications.

Quality Assurance:
TecnoVeritas has been certified to ISO 9001 since 1994 by Bureau Veritas. All the projects have their own quality plan which is submitted with each project and completed and signed prior to shipment.
TecnoVeritas has a complete set of Inspection Procedures and Test Documentation on file for each project.
Vendor qualification and supply auditing is enforced on a regular basis.

Testing:
All turbo expanders assemblies are subjected to a test bench where all the parameters are tested for a minimum of 1 hour. This test trials consists of running the machine at design speed along with the contract lube system for one hour.

FAQS

Why is the fluid R245fa preferred to other existing ORC fluids?
R245fa is not explosive!
R245 fa is not letal!
R245 fa has a very low boiling temperature, about 15.3 oC (@1.01 bar), thus allowing an extensive heat recovery.

Why is ORC TurboExopander 245 different from the other ORC systems on market?
Has a purpose built radial turbine;
Used a non explosive working fluid, therefore no Risk Analysis plan or ATEX electrical equipment is required;
It is a Plug-and-Play system;
Uses the most advanced control and monitoring technology;
The efficiency of TurboExopander 245 is higher than others;
TurboExopander 245 is neat;
TurboExopander 245 is delivered with a distance monitoring software;
TurboExopander 245 delivered in a container, therefore is modular;

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