Environmental Engineering Reference
In-Depth Information
equipment for energy conversion of this syngas open the potential to high energy recovery,
with respect to steam cycles proposed previously for the WtE and gasification cases.
Figure 4 - Simplified schematic of the proposed pyrolysis process with energy recovery.
The main operating parameters assumed for the simulations are reported in table 9. Table
10 shows the simulation main results and the details of calculated syngas characteristics. The
overall process efficiency is calculated as the ratio between the power output an the energy
entering with the waste.
Table 9. Main operating parameters assumed for the waste
pyrolysis with energy recovery.
Pyrolysis temperature [°C]
750
Pyrolysis pressure [bar]
1
Unreacted carbon [%]
4,60
Reciprocating engine efficiency [%]
35
Table 10. Main simulation results and details of calculated syngas characteristics.
Cycle main results
Syngas characteristics at pyrolysis reactor exit
Heat required by the pyrolysis reactor
[MW]
14,5
Temperature [°C]
750
Syngas mass flow rate for heating the
reactor [kg/h]
2.640
Mass flow rate [kg/h]
7.533
Syngas mass flow rate to engine [kg/h]
4.893
LHV [kJ/kg]
19.850
Syngas mass flow rate for heating the
reactor [%]
35
Compounds
Mass fraction
Syngas mass flow rate to engine [%]
65
N
2
0,018
Reciprocating engine power output [kW]
9.447
CO
0,778
CO
2
0,028
H
2
O
0,009
H
2
0,057
CH
4
0,1
NO
3
-
0,007
Other trace compounds
0,003
