Work

Experimental study on thermal decomposition and kinetic characteristics of coal in O2/CO2/N2 atmospheres with various CO2/N2 blend ratios

Year: 2026

Type: article

Abstract: This study explores the inhibitory mechanisms of CO2/N2 ratios and O2 concentrations on coal oxidative pyrolysis, providing theoretical insights into the use of CO2-N2 inert gas for fire prevention in goaf. Thermogravimetric analysis (TGA) was employed to investigate coal pyrolysis under varying coal metamorphism, heating rates, O2 concentrations, and CO2/N2 ratios. Results show that increasing the heating rate raises characteristic temperatures and enhances thermal decomposition in DX coal. The apparent activation energies of DX, TX, and YCW coals exhibit an initial increase followed by a decrease as conversion rates rise, peaking at 0.15 conversion. At a constant O2 concentration, the apparent activation energy is highest when the CO2/N2 ratio is 4:6, suggesting more energy is required and oxidation is more effectively inhibited. Conversely, increasing O2 concentration leads to a linear decrease in the apparent activation energies, indicating enhanced coal oxidative pyrolysis.

Source: Case Studies in Thermal Engineering

DOI: 10.1016/j.csite.2026.107653

Authors: Chunlei Wu, Jing Li, Bobo Shi, Yong Xue

Institutions: Nanjing University of Information Science and Technology, China University of Mining and Technology

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: $1,620