Work

Impact of Airflow and Temperature on Coal Secondary Oxidation-Induced Spontaneous Combustion Risk

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Increasing mining depths heightens the spontaneous combustion (SC) risk of coal in goafs due to elevated ground temperatures. This study examines the coupled effects of airflow and thermal pretreatment on secondary oxidation. Experiments were conducted on coal samples pretreated at 35, 50, and 65 °C under airflow rates of 50–200 mL/min. Results demonstrate that airflow rate and pretreatment temperature interact synergistically: low airflow (50–100 mL/min) increased activation energy and suppressed oxidation in 50 °C treated coal, whereas high airflow (150–200 mL/min) enhanced reactivity in 35 and 65 °C samples. Medium airflow (100–150 mL/min) served as a critical transition zone, differentially inhibiting or promoting oxidation based on pretreatment temperature. The “50 °C pretreatment + 200 mL/min airflow” combination particularly facilitated complete oxidation, yielding high CO 2 emissions. These insights are crucial for developing targeted ventilation strategies in deep mining goafs.

Source: ACS Omega

DOI: 10.1021/acsomega.5c05956

Authors: Ruirui Yu, Yiping Zhang, Ziwen Dong, Haojie Zhang, Peitao Zhu, Sishuang Wang

Institutions: Ningbo University of Technology, Guizhou University

Language: English

Topic: Coal Properties and Utilization

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Climate action

Open Access status: gold

Estimated APC paid: $1,935