Waste energy

EWHR- Ecological Waste-Heat Recovery


EWHR technology provides a low-cost solution for the treatment of flue gas emissions to the environment while increasing the thermal efficiency of water and steam boilers, in particular in industrial and heating installations.


The advantages of EWHR technology:

  • simultaneous emission of fumes below the dew point and removal of dust and gas pollution,

  • significant improvement of the efficiency of the heat generator (boiler, diesel engine, gas turbine or industrial furnace) or as a heat source for heating purposes.


The installation usually consists of two scrubbers preceded by dry exchangers. The plant has a scrubber with Raschig rings and a fluid bed scrubber. The recovered heat is transferred to the condensate or other available medium selected individually.


Heat recovery installations do not worsen the operating conditions of the boiler installation. The recovered heat (along with latent enthalpy) is used to heat the boiler water (eg DEMI return condensate and refill water) or combustion air and heating purposes, which leads to increased efficiency usually above 100%, and Waste Heat Recovery performs the wet task simultaneously removal of acid residues (SO2, Cl, ...) and ash from flue gas.

In the power and industrial boilers, installation of the denitrification system (SNCR) requires introducing a significant stream of water into the furnace (dosing solutions of aqueous reactants), which reduces boiler efficiency by a further ~ 1%. Recovering this thermal power and simultaneously a water jet can be the main advantage of Waste Heat Recovery.