E-Thesis 45 views 18 downloads
Re-use of Industrial Waste Heat Utilising Thermochemical Materials. / JACK REYNOLDS
Swansea University Author: JACK REYNOLDS
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PDF | E-Thesis – open access
Copyright: The Author. Jack Daniel Pearce Reynolds, 2024 CC BY - Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0).
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DOI (Published version): 10.23889/SUThesis.66883
Abstract
With the project aimed at recovering gaseous waste heat from industry, selecting thermochemical materials that match the site’s waste heat is crucial. An initial survey at TATA Colors, Shotton, identified three areas of waste heat generation:Locations A, B, and C, with temperatures around 110 °C, 220...
| Published: |
Swansea University, Wales, UK
2024
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | EngD |
| Supervisor: | Jewell, E., & Elvins, J. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa66883 |
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| Abstract: |
With the project aimed at recovering gaseous waste heat from industry, selecting thermochemical materials that match the site’s waste heat is crucial. An initial survey at TATA Colors, Shotton, identified three areas of waste heat generation:Locations A, B, and C, with temperatures around 110 °C, 220 °C, and 500 °C, respectively. Among six materials (salt hydrates and hydroxides) considered for their stability, energy density, and suitable decomposition temperature within the temperatures identified at the three locations, CaCl2 emerged as the most promising reactive material. Typically, salt hydrates are impregnated within porous matrices, a method known to mitigate hysteresis and enhance reaction rates. Expanded graphite (EG) was selected for the matrix component for its high surface area and thermal conductivity. An assessment of three EG-based matrices led to choosing EG and alginate-based matrices for detailed evaluation in this project. This comparative analysis identified milled expanded graphite (mEG) synthesised via the mould method (mEG-M) as the superior composite among those evaluated. Two lab-scale reactors of different sizes were developed to evaluate the charging performance of the composites. The charge reactions were monitored via temperature and mass logging within the reactor. Although the charge analysis was conducted below 200 °C, both reactors could accommodate temperatures up to 500-600 °C, covering the possibility to simulate all three identified locations. Adjusting salt loading within the mEG-M revealed that reduced salt loading optimises material performance and stability. A 60 % salt bath concentration, achieving approximately 70.9 wt% salt loading, significantly increased porosity.This adjustment facilitated improved kinetics and stability, accommodating expansion and deliquescence. Adjusting the composite size had less effect on charge kinetics but did influence discharge performance and synthesis throughput. The determination of the optimum composite ultimately hinges on the specifics of the available waste heat source and the required throughput of the material. |
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| Item Description: |
A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information |
| Keywords: |
Thermochemical Materials, Industrial Waste Heat, Thermal Energy Storage, Salt Hydrates, Expanded Graphite, Alginates, Decarbonisation. |
| College: |
Faculty of Science and Engineering |
| Funders: |
Tata Steel Colors, The Engineering and Physical Sciences Research Council (EPSRC via UKRI) EP/S02252X/1, European Social Fund via the Welsh Government (WEFO) (c80816). |