Environmental Engineering Reference
In-Depth Information
There is a large amount of energy produced in the air reactor, but the fuel reactor
needs to be supplied with energy. This is because the net heat work in the fuel
reactor is the summation of the heat work from the DECOMP, GASIFER, and
FUEL-R blocks. Although FUEL-R produces energy because of the combustion of
syngas, the combined energy requirement of DECOMP and GASIFIER is more
than the energy produced in FUEL-R. Summing the energy requirements of each
individual stream, the total energy obtained from the CLC process is 554.2 kW.
The results shown in Table
3
for the baseline case with a coal feed rate of
100 kg/h are in excellent agreement with those reported by Sahir et al. (
2012
).
These calculations validate our CLC model developed in ASPEN Plus.
2.2 Effect of Various Parameters on the Energy Output
of the CLC Process Simulation
With the successful validation of the process simulation of the CLC experiment of
Sahir et al. (
2012
) in the previous section, the ASPEN Plus simulation is expanded
to consider the effect of varying the air
flow rate and the oxygen carrier feeding rate.
Additionally, scaled-up simulations are also conducted to determine these effects
for an industrial-scale plant.
fl
Table 3 Input and output values for the baseline case corresponding to the work of Sahir et al.
(
2012
)
Input values
Coal (kg/h)
100
Steam (kg/h)
140
Air
fl
ow rate (kg/h)
71
Temperature of fuel reactor (
°
C)
950
Temperature of air reactor (
°
C)
935
Fe
2
O
3
fl
flow in the fuel reactor (kg/h)
59,21
Al
2
O
3
in the system (kg/h)
3,951
Particle density (kg/m
3
)
3,200
Energy balance (kW)
Fuel reactor
−
161.8
Air reactor
688.0
Cool air reactor exhaust
135.4
Cool flue gas
148.3
Cool oxygen carrier for air reactor
40.9
Reheat oxygen carrier for fuel reactor
42.7
−
Heat steam
−
69.8
Heat air
184.1
−
Net
554.2
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