Temperature effect on thermal conductivity of oxidised coal associated with its predictive model during coal pyrolysis

Lan Yin, Yang Xiao, Qing-Wei Li, Yuan Tian and Chi-Min Shu

Energy, 2023, vol. 274, issue C

Abstract: To explore the heat transfer characteristics of oxidised coal, four kinds of bituminous coal from Shilawusu coalmine (SLWS), Huangling coalmine (HL), Ewirgol coalmine (AWEG), and Sangshuping coalmine (SSP) respectively, were collected and oxidised at 80, 120, 150, and 200 °C in air. The thermal conductivity of each coal were measured by laser flash apparatus with 30–300 °C. Main proximate analysis indexes influencing the thermal conductivity of oxidised coal were received by grey correlation method. A predictive model was established to forecast the thermal conductivity of oxidised coal. The results indicated that, when the temperature enhanced from 30 to 300 °C, the thermal conductivity of each coal gradually increased, the thermal conductivity for SLWS, HL, AWEG, and SSP increased by 12.0–12.6%, 9.2–10.9%, 7.0–9.6%, and 7.6–8.7%. At fixed temperature, the thermal conductivity of each coal increased linearly, which was markedly affected by the change of fixed carbon, ash, and volatiles in coal. Furthermore, a predictive model was established to forecast accurately the thermal conductivity of oxidised coal with a low relative error. Such findings can deepen the understanding of heat transfer in oxidised coal, and provide a theoretical basis in the prevention and intervention of coal fires.

Keywords: Oxidised coal; Thermal conductivity; Growth rate; Grey correlation method; Predictive model (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544223008113
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:274:y:2023:i:c:s0360544223008113

DOI: 10.1016/j.energy.2023.127417

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().