Study on combustion characteristics and oxidation kinetics of water-immersed coal under different ventilation rates
ZHAO Jiyu
Abstract：The sudden air drying of coal samples during long-term immersion in water will increase the risk of coal spontaneous combustion,and then coal spontaneous combustion will occur.Ventilation rate is a key factor affecting coal spontaneous combus-tion,but its effect on spontaneous combustion of water-immersed coal is not clear.In order to investigate the effect of ventilation rate on the combustion characteristics of water-immersed coal,this paper first tested the cross-point temperature and CO and CO2 release patterns of coal samples during low-temperature oxidation using a programmed heating system,then tested the combustion character-istics of water-immersed coal using a simultaneous thermal analyzer,and finally tested the functional group content of water-im-mersed coal using infrared spectroscopy.The study showed that:the cross-point temperature of the coal sample was the lowest when the ventilation rate was 60 mL/min,but the release of CO and CO2 increased with the increase of ventilation rate;the optimal ventila-tion rate existed in the coal combustion process,when the activation energy of the coal was the smallest,and the coal burned more easily and released more heat;the higher the ventilation rate,the more oxygen-containing functional groups such as carbonyl and carboxyl groups were contained in the coal,which provided the coal oxidation sufficient energy source for coal oxidation.
Keywords：water-immersed coalcombustion characteristics of coalspontaneous combustionventilation ratecross point temperature
Publication Date：2024-05-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 131-139 )