Transient Thermal‐Stress Analysis of Steel Slag Pots: Impact of the Solidifying‐Slag Layer on Heat Transfer and Wear1. Issue 6 (9th November 2015)

• Record Type: Journal Article
• Authors: Neacşu, Ioana Adina; Scheichl, Bernhard; Rojacz, Harald; Vorlaufer, Georg; Varga, Markus; Schmid, Herbert; Heiss, Josef
• Is Part Of: Steel research international. Volume 87:Issue 6(2016)
• Page Start: 720
• Page End: 732
• Publication Date: 2015-11-09
• Subjects: cast steel -- finite‐element modeling -- solidification -- Stefan's problem -- thermal‐stress management; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201500203
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : The containers used for steel slag transportation to the recycling depot undergo high‐temperature gradients and often deform plastically. Also, parts of the thereby solidified slag adhere to the pot walls, causing demolding problems and wear. A thorough finite‐element analysis of the heat transfer, initiated by filling the pots and essentially driven by radiation, and the thermal stresses is performed. Due to periodic fill‐in and discharge, these are assumed to admit a quasi‐stationary state referring to the pot temperature before their emptying. The so obtained results aid optimizing the pot shape and the transport process in terms of minimizing maintenance and anti‐adhesive cladding. A layer of solidified slag is found to exist throughout the transport process. Although the phase change occurs almost instantaneously at a liquid–solid interface, the "mushy zone" is considered in the accompanying analytical study of the associated Stefan‐type problem. Good correlations of the predicted temperatures to the measured ones and the resultant surface damaging are obtained. Abstract : A finite element analysis of the thermo‐mechanical stresses in slag pots shows the critical regions when the pot is filled with liquid slag . The maximum radial wall deformation occurs right below the filling level, while the upper ring is slightly displaced toward the inside of the pot. These findings agree with field observations and serve for the geometry optimization of slag pots.