Waste Heat

Waste Heat

Waste heat is one of the most undervalued, and untapped energy resources in industry. As energy prices rise, and greenhouse gas emissions become more important to business, surplus heat becomes a valuable resource that should not be wasted.

Our solution is to use an organic rankine cycle turbine to convert waste heat into electricity. Our international partners have achieved this in many applications including applications such as:

  • Cement kilns
  • Glass furnaces
  • Refractory plant furnace
  • Biodiesel factory
  • Diesel engines and remote area power supplies
  • MDF plants
  • Steel factories
  • Refineries

Advantages of ORC in Heat Recovery Applications

Compared to other competing technologies (i.e. steam turbines), the main advantages obtained from the ORC technology are the following :

  • high cycle efficiency (especially if used in cogeneration plants);
  • very high turbine efficiency (up to 90%);
  • low mechanical stress of the turbine, thanks to the low peripheral speed;
  • low RPM of the turbine allowing the direct drive of the electric generator without reduction gear;
  • no erosion of the turbine blades, thanks to the absence of moisture in the vapour nozzles;
  • very long operational life of the machine due to the characteristics of the working fluid that, unlike steam, is non eroding and non corroding for valve seats, tubing and turbine blades;
  • no water treatment system as in steam plants is necessary.

There are also other relevant advantages, such as simple start-stop procedures, quiet operation, minimum maintenance requirements and good partial load performance.

Combined cycle engine or turbine applications

A special type of heat recovery is at the back end of industrial gas turbines, or gas/diesel engines. in these cases we can achieve additional power generation of up to 12% on engines, or 20% for turbines.

Waste steam

In some circumstances where waste steam exists, we can use either an ORC, or a small “microsteam” turbine, combined with an ORC. In this case, a small back-pressure steam turbine generates power from the excess steam, and the steam condenses in the ORC evaporator, which makes additional power.