Environmental Engineering Reference
In-Depth Information
Table 4. Main operating parameters assumed for the waste
combustion with energy recovery
Combustion temperature [°C]
1.100
Steam maximum temperature [°C]
400
Steam maximum pressure [bar]
40
Steam cycle condenser pressure [bar]
0,25
Exhausts HRSG entering temperature [°C]
620
Exhausts HRSG exiting temperature [°C]
150
Internal consumption [%]
12
Figure 2. Simplified schematic of the considered WtE process.
Table 5. Main results form the WtE simulations.
MSW
Combustible fraction
Waste mass flow rate [kg/h]
14.344
9.537
LHV [kJ/kg]
10.127
12.201
Entering thermal power [kW]
40.350
32.322
Gross power output [kW]
10.109
8.356
Net Power output [kW]
8.896
7.376
Exhaust mass flow rate [kg/h]
90.582
68.750
Gross efficiency [%]
25,1
25,8
Internal consumption [%]
12
12
Net efficiency [%]
22,05
22,82
CO
2
mass flow rate output [kg/h]
13.841
10.643
Gasification with Energy Recovery
The simulation of the gasification process with energy recovery was carried out using the
commercial software Aspen Plus® (Aspen Technology Inc.), considering as input only the
combustible fraction, in reference to the elemental composition and mass flow rate reported in
table 3.
The simplified schematic of the proposed gasification process with energy recovery is
shown in figure 3.
