Optimal integrering av energianvändningen vid ... - Gasefuels AB
Optimal integrering av energianvändningen vid ... - Gasefuels AB
Optimal integrering av energianvändningen vid ... - Gasefuels AB
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Tabell 5. Investerings- och driftskostnader till fallstudie 2.<br />
Table 5. Investment and operational costs to case study 2.<br />
Digestion 0,15 kr/kWh<br />
Biogas upgrading, water absorption 0,071 kr/kWh<br />
Biogas upgrading, chemical<br />
absorption<br />
0,10 kr/kWh<br />
Mechanical dewatering 17,3 kr/tonne bio – manure<br />
283 kr/tonne pellet<br />
Evaporation 37 kr/tonne evaporated<br />
water<br />
31 kr/tonne biofertiliser<br />
507 kr/tonne pellet<br />
Combined drum dryer and band dryer 436 kr/tonne evaporated<br />
water<br />
53 kr/tonne biofertiliser<br />
872 kr/tonne pellet<br />
Pellet press 6,7 kr/tonne biofertiliser<br />
108 kr/tonne pellet<br />
xv<br />
VÄRMEFORSK<br />
A heat price less than 0,3 kr/kWh gives an advantage for chemical absorption, while a<br />
steam price higher than 0.3 kr/kWh gives the water scrubbing technology lower total<br />
costs. The calculations assumed that all surplus heat from both upgrading technologies<br />
can not be used.<br />
Sensitivity analysis in Figure 8 shows the total drying costs as a function of steam and<br />
hot water price. Mechanical dewatering uses no steam and is therefore not affected by<br />
the steam price. The evaporation plant is marginally affected by an increased steam<br />
price since mechanical vapour recompression is used which only requires small<br />
amounts of steam. The drying cost is highly affected by the steam price.
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