Numerical and Techno-Economic Analysis of Batch Annealing Performance Improvements in Tinplate Manufacturing
Author:
Schoina L.1,
Jones R.2,
Burgess S.2,
Vaughan D.2,
Andrews L.2,
Foley A.2,
Valera Medina A.1ORCID
Affiliation:
1. College of Physical Sciences and Engineering, Cardiff University, Queen’s Buildings, 14-17 The Parade, Cardiff CF24 3AA, UK
2. Tata Steel UK Ltd., Trostre Works, Maes-Ar-Ddafen Road, Llanelli SA14 9SD, UK
Abstract
The present study examines the performance improvement in the batch annealing process used in tinplate manufacturing by enhancing the heat transfer towards the steel coils and altering annealing cycle parameters. Presently, the heat transfer in the furnace is non-uniform, resulting in non-uniform temperature profiles and recrystallisation inside the coils, affecting the final coated steel quality. This study modelled a current furnace and four improvement proposals utilising transient computational fluid dynamics, to produce coil temperature profiles and rank the cases by the highest coil temperature uniformity achieved at the end of soaking. By increasing the soaking temperature and time, as well as the coiling tension before annealing and altering the coil size, the aim was to achieve higher and more uniform coil temperatures that could ensure successful recrystallisation with less defects, especially at the cold spot area in the middle of the coil. Then, a techno-economic analysis compared the cost-effectiveness of the scenarios based on the associated costs and the improvement in the scratching defects of the batch-annealed steel. Overall, most cases exhibited positive results regarding temperature uniformity enhancement, but increasing the coiling tension was considered the most promising option, due to the combination of a large defect reduction potential and cost savings per cycle.
Funder
European Social Fund through the Welsh Government
Tata Steel UK Ltd.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference56 articles.
1. Morgan, E. (1985). Tinplate & Modern Canmaking Technology, Pergamon Press. [1st ed.].
2. JFE Steel Corporation (2020). Tin Mill Products, JFE Steel Corporation. Available online: https://www.jfe-steel.co.jp/en/products/sheets/catalog/b1e-006.pdf.
3. ITRA Ltd. (2000). Guide to Tinplate, ITRA Ltd.. [2nd ed.].
4. SMS Group GmbH (2015). Efficient Production of Tinplate Packaging Material out of Cold-Strip, SMS Group GmbH.
5. ASM International (2015). Subject Guide: Heat Treating, ASM International. Available online: www.asminternational.org.