Heat Recovery Systems for Alleima : Investigating the possibility of creating smaller local heating systems in Sandviken Industrial Park

Sammanfattning

The ongoing energy transition poses major challenges to energy-intensive sectors like industry, particularly in heating and cooling. As part of the European Green Deal, the EU aims to become carbon neutral by 2050, emphasizing renewable energy and improved efficiency. One way to enhance efficiency and reduce CO2 emissions is through waste heat recovery. This study focuses on the steel company Alleima in Sandviken Industrial Park, Sweden, where an outdated steam network is gradually being replaced by internal district heating. A proposal to develop two local heating systems (LHS1 and LHS2) raised the question of whether these could operate independently, using local waste heat sources. Through a literature review, site visits, interviews and energy calculations, the study found that the waste heat in the buildings is low-grade (17 - 56 °C) and requires upgrading with heat pumps. After upgrading, LHS1 and LHS2 could supply 3104 MWh and 30 042 MWh, respectively, exceeding their annual comfort heating demands. However, analysis shows that interconnecting the LHSs with the internal district heating network is the most favorable solution, functionally, economically, and environmentally.