Local infrastructures for CCS clusters: A case study of two CHP plants in Gothenburg
Typ
Examensarbete för masterexamen
Program
Innovative and sustainable chemical engineering (MPISC), MSc
Publicerad
2021
Författare
Johansson, Emelie
Ignell, Victoria
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Climate change is a global problem and measures to reduce CO2 emissions are required.
One acknowledged measure, both in Sweden and globally, is carbon capture
and storage (CCS). This thesis investigates economic benefits for infrastructure cooperation
in CCS implementation including solvent regeneration, liquefaction and
transport to an intermediate storage.
Two combined heat and power (CHP) plants in Sävenäs owned by Renova and Göteborg
Energi were investigated as a case study. The capture plants were modelled
in Aspen Plus as post-combustion processes with monoethanolamine as a solvent.
Heat demand and other utilities were quantified to decide the impact on the heat
and electricity production at each plant. Based on the utility demand and equipment
need, an economic analysis was performed. The cost for CO2 liquefaction
and transport were estimated. Four scenarios for the operation of the CHP plants
including maintained fuel usage, maintained district heat delivery, collaboration to
maintain district heat delivery and reduced capture rate, were compared.
The work concludes that, depending on scenario, the capture cost for separate plants
at Renova and Göteborg Energi is 39-46 and 80-82 €/ton CO2, respectively. For
a capture plant with a shared infrastructure, the capture cost is 45-52 €/ton CO2.
The result shows a possible district heat recovery of 70% from the capture plant,
which is important to decrease the cost of the heat demand. The heat integration
with the steam cycle is important for the capture cost. Use of primary steam leads to
higher variable OPEX, due to higher reductions in electricity generation, but lower
impact on district heating generation, than the use of an extracted stream from the
turbine. The plant utilisation is more important for the specific capture cost than
the size of the CHP plant. Depending on the allocation of the cost between the
companies, the possible savings are between 0.2-1.0 M€/yr corresponding to 2-5%
of the total cost. Therefore, there are small economic benefits with a shared process
where shared liquefaction has the most potential.
Beskrivning
Ämne/nyckelord
CS , CHP , CO2 Transport , Liquefaction , CO2 Storage , Cluster , CCS Infrastructure , MEA , Gothenburg