The energetic efficiency (EE) of an existing waste to energy plant (WtE) was investigated in the perspective of the waste framework directive 2008/98/EC (WFD). WFD introduced the possibility of considering the WtE a material recovery facility if its EE resulted not lower than 0.6. Currently the analysed WtE recovers only electrical energy from waste combustion by a steam turbine and showed an EE of about 0.44. This figure can be increased up to 0.6 if the WtE is operated in a combined heat and power mode (CHP). CHP can be realized exploiting a given fraction of the saturated steam generated by the evaporator. In the average operating conditions of the WtE about 2,900 kg/h of steam used for CHP can lead to EE ≥ 0.6. This heat was used for feed and organic Rankyne cycle able to produce up to 250 kW with an average electrical efficiency of about 13%, comparable to the one of the WtE.
IMPROVING THE ENERGETIC EFFICIENY OF AN EXISTING WASTE TO ENERGY PLANT
DI MARIA, Francesco;BIDINI, Gianni;CONTINI, STEFANO;
2015
Abstract
The energetic efficiency (EE) of an existing waste to energy plant (WtE) was investigated in the perspective of the waste framework directive 2008/98/EC (WFD). WFD introduced the possibility of considering the WtE a material recovery facility if its EE resulted not lower than 0.6. Currently the analysed WtE recovers only electrical energy from waste combustion by a steam turbine and showed an EE of about 0.44. This figure can be increased up to 0.6 if the WtE is operated in a combined heat and power mode (CHP). CHP can be realized exploiting a given fraction of the saturated steam generated by the evaporator. In the average operating conditions of the WtE about 2,900 kg/h of steam used for CHP can lead to EE ≥ 0.6. This heat was used for feed and organic Rankyne cycle able to produce up to 250 kW with an average electrical efficiency of about 13%, comparable to the one of the WtE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
