Features & Benefits of Heat to Energy

Operational Benefits

  • Unmanned operation
  • Simple start stop procedures
  • Automatic and continuous operation
  • Partial load operation down to 10% of nominal power
  • Partial load conditions are obtained by modulating a three way valve to enable variations
  • High efficiency even at 50% of nominal load (electrical efficiency is circa 90% of nominal electrical efficiency)
  • No operator attendance needed due to absence of a high pressure vapour generator (HRSG)
  • Quiet operation
  • High availability circa 98%
  • Low maintenance requirements 3-4 hrs per week
  • Long life, 20 yrs +

Technical Features

  • Low Complexity
  • Low RPM i.e. no reduction gears needed for the generator
  • No raw water treatment plant needed
  • No demineralised water treatment plant needed
  • No chemical dosing plant
  • No working fluid superheating
  • No high pressure steam generator
  • No corrosion issues
  • Added thermal stability
  • Simpler control system architecture
  • Three simple blocks construction

Commercial Benefits

The consumption of raw fuel by industry is costly and inefficient. New technologies are necessary to deliver a more effective alternative for future consumption. The new utility sized ORC solution is such a technology. This alternative has made it possible to capture the waste heat from many applications and deliver a cost benefit solution to a variety of customers.

As an example

Consider capturing the waste heat from a single 50MW light industrial gas turbine and using this waste heat as the fuel for the ORC process. It is then possible to generate the same level of electrical energy with a fuel saving of around 10% (circa 550,000 GJ/yr), a reduction in emissions in the region of 15%, and a reduction in the power plant noise burden.

This fuel saving can quickly be translated to a real reduction in the asset operational costs and can be utilised to fund the conversation process under a power purchase agreement arrangement (PPA), within a defined payback period.

Initial studies show a “Win Win” scenario where the asset owner sees a real cost reduction in operating costs, even after the payment regime of the PPA, as well as delivering a financial return to the ORC provider.