Publication date: 14th September 2021
Heavy industry, such as steel making, are UK CO2 emissions hot spots and can release up to 50% of consumed energy as waste heat. The primary steel making at Tata Steel Port Talbot produces waste heat at a continuous 760MW, which is equivalent to the combined heating demand of around 500,000 homes and the capture and reuse of this heat would offset more than 1,000,000 tonnes of CO2 annually.
The capture and reuse of waste heat is an essential component of the global decarbonisation plan, providing the opportunity to offset carbon produced during primary energy generation. Many production facilities already capture a large portion of medium and high grade waste heat but poor conversion efficiencies and high expense limit the capture of low grade heat. Focusing on low grade heat sources, the current work investigates the capture, storage and reutilisation of heat from industrial waste air streams using heat storage materials such as SIM (Salt In Matrix) and AGC (Alginate graphite composites).
Ongoing site surveys and a review of previous waste heat projects are creating live energy maps of production facilities and have provided target temperatures to which heat capture materials can be attuned. The waste heat sources have been categorised between low, medium and high grade and ranked on feasibility of capture.
Inhouse constructed, small-scale, reaction chambers allow the assessment of multiple charge and discharge cycles in an open-system configuration. These systems allow the replication of process conditions, without the need to infiltrate the process, providing a systematic and repeatable methodology for screening material sets. The data from these investigations can be subsequently analysed to determine the potential for energy capture across the production facility.
The authors acknowledge the help and support from Samir Boudjabeur, Darryl Lewis, Jordan Bowyer and Dawn Harris of Tata Steel UK.
Funding for the project is provided by European Regional Development Fund through the Welsh European Funding Office and Flexis App programme.
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