Investigation of the opportunity for heat integration at Preemraff Göteborg
Examensarbete för masterexamen
The industrial society is a large contributor to the anthropogenic climate change. It is therefore crucial to decrease the use of fossil fuels and to find better and more sustainable alternatives that are economically feasible. When price of energy and carbon credits increases due to limited reserves and environmental issues, the significance for improving energy efficiency becomes more important. For an energy demanding industry like oil refining, the incentives to decrease energy consumption is large in order to keep down the running costs. Pinch analysis is than a helpful tool for identifying potential energy savings at an existing plant. In this master thesis, a pinch analysis has been performed at Preemraff Göteborg with the objective to investigate the option for increased internal heat recovery, thereby decreasing the utility demand. The potential for energy savings has been evaluated using information and stream-data collected at the refinery. The pinch analysis shows that Preemraff Göteborg has a theoretical potential to save 40,2 MW of hot and 47,8 MW of cold utility. A retrofit replacing 12,9 MW of hot and 10,9 MW of cold utility, out of which 3,1 MW is reduction of deliveries to the district heating system, has been identified. The proposed heat exchanger network consists of 10 heat exchangers, and the cost was estimated to 28,5 MSEK with a payback time of 0,48 year. The retrofit also corresponds to approximately 25 kton of decreasing CO2 emissions annually.
Energi , Hållbar utveckling , Kemiteknik , Energy , Sustainable Development , Chemical Engineering