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Search for: [Affiliation = "Gutowski, P. \: Mechanical Engineering Faculty, West Pomeranian University of Technology, Szczecin, Al. Piastów 19, 70\-310 Szczecin, Polska"]

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Effect of Thermal Nodes Reduction in Wall Connections of the Charge-Handling Furnace Grates on Thermal Stresses

A. Bajwoluk P. Gutowski

Archives of Foundry Engineering | 2021 | vo. 21 | No 3 | 53-58 | DOI: 10.24425/afe.2021.138665

Keywords Cast grates Heat-resistant castings Heat treatment equipment Thermal stress analyses

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Abstract

The paper presents FEM approach for comparative analyses of wall connections applied in cast grates used for charge transport in furnaces for heat and thermal-chemical treatment. Nine variants of wall connection were compared in term of temperature differences arising during cooling process and stresses caused by the differences. The presented comparative methodology consists of two steps. In first, the calculations of heat flow during cooling in oil for analysed constructions were carried out. As a result the temperature distributions vs cooling time in cross-sections of analysed wall connections were determined. In the second step, based on heat flow analyses, calculations of stresses caused by the temperature gradient in the wall connections were performed. The conducted calculations were used to evaluate an impact of thermal nodes reduction on maximum temperature differences and to quantitative comparison of various base design of the cast grate wall connection in term of level of thermal stresses and their distribution during cooling process. The obtained results clearly show which solution of wall connection should be applied in cast grate used for charge transport in real constructions and which of them should be avoided because the risk of high thermal stresses forming during cooling process.

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Bibliography

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[7] Nandwana, D., et al. (2010). Design, Finite Element analysis and optimization of HRC trays used in heat treatment process. In World Congress on Engineering 2010, June 30 - July 2, 2010 (pp. 1149-1154). London, U.K.: Newswood Limited.
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[9] Standard PN-EN 10295: 2004. Heat resistant steel castings.
[10] Bajwoluk, A. & Gutowski, P. (2019). Thermal stresses in the accessories of heat treatment furnaces vs cooling kinetics. Archives of Foundry Engineering. 19(3), 88-93, DOI: 10.24425/afe.2019.127146.

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Authors and Affiliations

A. Bajwoluk

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P. Gutowski

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Mechanical Engineering Faculty, West Pomeranian University of Technology, Szczecin, Al. Piastów 19, 70-310 Szczecin, Polska