English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The non-uniform distribution of coal porosity has a considerable impact on coal spontaneous combustion (CSC) characteristics. In this study, a one-step global coal oxidation numerical model which took into account the thermal buoyancy and the generation and consumption of multi-component substances was established. The movement of the hot spot and the evolution characteristics of reactants during CSC were researched on. The results suggest that in the early stage of coal self-heating, the hot spots are generated in the high-porosity areas. As coal oxidation intensifies, the hot spots move to the air supply positions. Different coal porosity distributions result in different thermal runaway times, and the coal samples are prone to thermal runaway when the high-porosity areas are near the air supply positions. Resultantly, the movement path of the hot point becomes longer, leading to a larger reduction of average density. Meanwhile, the corresponding thermal runaway and the drastic change in oxygen mole fractions occur later, and the drastic change in thermal runaway is more likely to lag behind that in the oxygen mole fraction. Compared with the gradually changing porosity distribution, the abruptly changing porosity distribution tends to hinder the development of coal oxidation perpendicular to the sudden change cross-section.

Numerical Simulation Study on Coal Spontaneous Combustion: Effect of Porosity Distribution