Environmental Engineering Reference
In-Depth Information
15.18
Specific biogas upgrading costs for water scrubber based on
price indications and warranty values according to [15] (Copyright:
Fraunhofer IWES, 2012).
desulphurization has not been considered. Calculations are based on
specific electricity demands from 0.22 kWh
el
/m
n
3
(1400m
n
3
/h upgrading
capacity) to 0.25 kWh
el
/m
n
3
(300m
n
3
/h upgrading capacity), both related to
raw biogas, and independent of CH
4
concentrations in the raw gas flow.
Furthermore, costs are related to methane recovery rates of 99.0%, product
gas pressures of 5 bar and average ambient temperatures of 10
C. Water
consumptions were assumed to be 1m
3
/day for small and 3m
3
/day for large
upgrading capacities, using costs of 5
8
/m
3
including wastewater charge.
Figure 15.19 shows specific upgrading costs for raw gas upgrading
capacities in the range 250-2800m
n
3
/h for a Genosorb
®
scrubber system.
Precision desulphurization has not been considered. Calculations are based
on specific electricity demands of 0.23 kWh
el
/m
n
3
(500-2800m
n
3
/h upgrad-
ing capacity) and 0.27 kWh
el
/m
n
3
(250m
n
3
/h upgrading capacity), both
related to raw biogas and independent of CH
4
concentrations in the raw gas
flow. Costs are related to methane recovery rates of 98.5% and product gas
pressures of 6.5 bar. Heat for desorption is assumed to be provided within
the system without any external heat supply.
Figure 15.20 shows specific upgrading costs for raw gas upgrading
capacities in the range 250-2000 m
n
3
/h for an amine scrubber system.
Precision desulphurization has been considered. Calculations are based on
specific electricity demands of 0.09 kWh
el
/m
n
3
(65% CH
4
in raw gas flow)
and 0.11 kWh
el
/m
n
3
(55% CH
4
in raw gas flow), as well as specific heat
demands of 0.45 kWh
th
/m
n
3
(65% CH
4
in raw gas flow) and 0.58 kWh
th
/m
n
3
(55% CH
4
in raw gas flow), all values related to raw biogas. Furthermore,
€
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