Gaseous Waste Heat-to-Power
Our initial system addresses the costly problem of residual heat loss in industry. Gaseous exhaust from such processes as steel and aluminum melting, glass making, ceramics curing, cement making, and VOC incineration can contain from 20-70% of the total heat generated for the process. For heat sources above 1100°F we use a single pass critical pressure steam generator, which delivers high pressure steam to a piston steam expander. The expander produces power from the expansion of the steam and rejects steam to the 250°C ReGen condensing engine. The 600PSI steam is condensed under pressure on the engine’s hot side heat exchanger, where the latent heat is converted into power. The efficiency of the combined cycle system is 49%, the highest of any waste heat conversion system.
For lower temperature sources a 250°C engine can be used by itself . In this mode a steam loop would be used to extract heat from an exhaust stream and deliver the heat in the form of steam to the engine. If there is a large amount of lower temperature exhaust above 350°F, a 100°C engine could be used at a lower efficiency.
The skid-mounted power system consists of the engine, drive system, generator and electric switchgear.
Electric efficiency: Combined cycle – 49%, 250°C ReGen engine – 25%
Low Pressure Steam-to-Power
The 100ºC heat engine acts in place of a low pressure steam condenser to convert the latent heat of condensation from steam to power. Its design is similar to its higher temperature cousin, although its dimensions are larger to create sufficient power from the lower energy steam.
Electric efficiency: 13%
Power output options: 250kW, 500kW, 1MW