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GET Green Energy Turbine – Gas expansion turbine with generator

The GET turbine generator an innovation that pays you back.

The green turbine generator is used to recover even small amounts of residual or waste energy and convert it into electrical energy. The performance range of the green turbine is between 3 and 350 kW. This electricity can be fed into the network or used for in-house industrial consumption. 

As a leading manufacturer of expansion turbines, DEPRAG SCHULZ GMBH & CO. can be instrumental in increasing your energy efficiency. The goal of reducing CO2 emissions can therefore be achieved as part of the Germany Federal government’s requirements for climate protection. To date, DEPRAG has supplied and launched more than 300 turbine generators, as axial and radial turbines in a variety of processes, in series production worldwide.

The gas expansion turbine is a turbo machine. The specific fluid-mechanical design of the components for the turbine and generator will depend on your individual processing parameters. The product is aimed at ORC system manufacturers and companies which are able to integrate an ORC turbine in their existing process or plant.

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Our product - The gas expansion turbine

 

The unit consists of an expansion turbine and generator for optimal decentralised energy recovery for the power range 3 kW to 350 kW.    

As a “waste to power” solution, the small, robust and compact turbine generator can be integrated peripherally anywhere small amounts of residual and surplus energy are left unused from a process.

A great variety of applications can be realised:

  • Direct usage in open systems using pressure and temperature gradients, such as a gas expansion system
  • Indirect usage in a closed energy generation cycle, such as an Organic Rankine Cycle (ORC) for cogeneration or combined heat and power plants (CHP) or waste heat utilisation in industrial processes


Do you have a specific application example?  Our experts will be happy to advise you.

 

The outstanding features of the turbo expander:

Impressive degree of efficiency

The gas expansion turbine is specifically designed for the processing conditions required. The degree of efficiency can reach up to 80% and is therefore significantly higher than when using standard machines, such as piston motors or screw expanders.

Exceptionally low maintenance

The turbine unit does not require a gear between the turbine and the generator. The generator’s rotor is located directly on the shaft with the turbine wheel and is driven by it. The GET turbine generator is therefore extremely low maintenance and ideally suited for continuous use.

Low investment outlay

Thanks to our calculation programs, the Green Energy Turbine can be designed swiftly in accordance with your own specific requirements. For the generator components, we use a standard modular system, resulting in a cost-effective investment.

The technical data of the gas expansion turbine:

Generator sizes

 

  • 5 kW
  • 30 kW
  • 60 kW (ATEX)
  • 120 kW
  • 175 kW
  • Additional sizes on request

Pressure range

 

  • 0 - 63 bar
  • higher pressures on request

Temperature range

 

  • Min. temperature required -20°C
  • Max. range of use up to 400°C
  • Depending on the medium used

Processes

 

  • Direct usage or open process
  • Indirect usage or closed process

Power range

 

  • 3 – 350 kW turbine power

Mediums

 

  • Compressed air, CO2, steam
  • Natural gas
  • Refrigerant
  • Siloxane, alkane, etc.

Do you already have a specific application and your processing data prepared? Design your gas expansion turbine here and our engineers will be able to process your request even more quickly.

Turbine generator function

The GET Green Energy Turbine is a turbo machine which can be used axially or radially with one or more stages. The expander converts the available energy into electrical energy due to the expansion of a gas from high to low pressure at constant mass flow. As an impulse or reaction turbine, the kinetic energy is passed into the jets and turbine wheel.

Axial turbine

  • High degree of efficiency even outside nominal operating conditions

        → enables extremely efficient operation even at partial load

  • Axial impulse or constant-pressure turbines, single or double row available
  • Axial reaction turbine, single or double stage options (multistage avavilable on request)    

Radial turbine

  • Even higher degree of efficiency directly at the design point

        → only partial expansion of the gases in the jets 
        → the rest of the expansion and redirection takes place in the turbine wheel

  • High degree of efficiency in comparison with the axial design
  • Also known as a reaction turbine or radial outflow turbine

The different application areas of the turbine

The DEPRAG gas expansion turbine recovers energy, meaning that even small amounts of residual process gas can be utilised. This means that energy recovery with the latest technology is an option for many sectors of industry. Our engineers will be happy to speak with you today to discuss whether your company is able to use our environmentally friendly turbine.

 

Energy recovery in energy-intensive industrial processes

In the glass, steel, ceramic or building materials industries, mediums such as compressed air or natural gas are used to supply the processes. The GET® turbine generator can convert the existing pressure energy into electricity and feed it into the electricity network or use it for in-house consumption. This prevents compressed air losses and increases the efficiency of the necessary pressure reduction in the natural gas network (expansion of natural gas).

 

Energy recovery from residual energy in power stations

When burning gas, e.g.in combined heat and power plants (CHP) which are operated with biogas, natural gas or synthesis gas, as well as in furnaces, waste heat from the motor cooling system or exhaust gas flow can be recovered. In a closed cycle, such as the Organic Rankine Cycle (ORC), an organic medium is vaporised (surplus heat in the cycle), expanded in the ORC turbine and converted into electricity using the generator.
 

 

Energy recovery through gas expansion in the natural gas network

Natural gas is pumped at high pressure from producing countries over thousands of kilometres through pipelines to reach the consumer. To feed it into regional networks, in which a lower pressure prevails, pressure must be decreased and the gas expanded. The transformation of pressures in the gas lines means that valuable energy is being lost, which the turbo expander is able to convert into electrical energy at low cost and without a large outlay.

The utilisation principles of the gas expansion turbine

Direct usage

During direct usage, the energy is recovered through a drop in pressure and converted into electrical energy. This occurs, for example, during the expansion of compressed gases such as compressed air, natural gas or steam using an expansion turbine or gas expansion turbine.  

Indirect usage

In the case of indirect usage, previously unused surplus heat is converted into electrical energy using a closed process. This occurs, for example, during waste heat recovery in a closed cycle (ORC system), such as an ORC turbine or steam turbine.

Future-oriented research and development at DEPRAG


DEPRAG SCHULZ GMBH u. CO. continually invests in research and development. It is our aim to give further impetus to the use of sustainable energy supported by new ideas and innovative solutions. We also rely on cooperation with external institutions and higher education facilities:

  • East Bavarian University of Applied Sciences (OTH) Amberg-Weiden – Center of Excellence for Cogeneration Technologies (CeCoGen)
  • Nuremberg Institute of Technology Georg Simon Ohm – Centre of Competence for Energy Engineering
  • University of Bayreuth – The Center for Energy Technology (CET)

Completed projects:

  • Project „TurboSmart – adaptive micro-expansion turbine for energy recovery"

Funded by the Bavarian Research Foundation

The research project was led by the Center of Excellence for Cogeneration Technologies at the OTH Amberg-Weiden in cooperation with DEPRAG and the Center for Energy Technology at the University of Bayreuth. It dealt with the intelligent use and generation of electricity from process heat.

Funded by the Federal Ministry of Economics and Technology on the basis of a resolution passed by the German Parliament.

Are you working on a particular research project? Contact us now and we can step into the future together!

Please contact us now with any questions

Do you have further questions about our gas expansion turbine? Our experts will be happy to advise and support you in making the right choice for your business.

Download the product catalogue now

Our GET Green Energy Turbine catalogue provide clear and comprehensive information about our gas expansion turbine generator.