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• The ignition point of fresh pine is higher than that of natural aging pine. • Starink method was used to evaluate the kinetic parameters of pine combustion. • Natural aging degrades the burning performance of pine wood when burned. Given the long-term effects of natural ageing, the wooden structure and combustion performance of ancient buildings have changed. Therefore, studying the combustion characteristics of naturally aged pine (NAP) trees may help provide a basis for the numerical simulation of fires in ancient buildings. In this study, NAP and fresh pine (FP) with a natural ageing duration of approximately 100 years were selected as samples. The morphology, thermal weight loss process, exothermic characteristics, and combustion characteristics of these two types of pine were examined through scanning electron microscopy, synchronous thermal analysis, and cone calorimetry. In addition, the thermodynamic parameters of both the samples were analysed and evaluated. The results indicated that the natural ageing effect resulted in pore enlargement and severe damage to the cell structure of pine wood. Compared with FP, the ignite of NAP decreased by 15.2 °C, and the heat dissipation of NAP during oxidative combustion decreased by 0.26 kJ/g. In addition, the average apparent activation energy of NAP during pyrolysis combustion increased by 22.03 kJ/mol compared with FP, but the overall combustion performance decreased. During the combustion process, NAP tended to form a dense carbonisation layer, resulting in a decrease in the heat release rate, total heat release rate, flue gas release rate, and CO and CO 2 release rate during combustion. [ABSTRACT FROM AUTHOR]

To accomplish various and efficient inhibitions of coal spontaneous combustion (CSC) and solve the safety hazards of CSC encountered in the production and operation of coal mining enterprises, inhibitors play an important role in the prevention and management of CSC. Herein, we report quercetin, which is selection as an antioxidant to prepare a composite solid lipid inhibitor. The concentration of the composite solid lipid inhibitor with the best inhibition effect on the active groups is selected by Fourier pressure infrared experiments, the change pattern of gas content and characteristic temperature released from coal samples during an oxidation process warming process was tested by using a programmed warming test system and simultaneous thermal analysis experiments, and finally, the inhibitory rate and combustion characteristic index were calculated. The results of the research showed that 10 mass% of quercetin had the most impact on the various groups, the highest inhibitor rate of the composite solid lipid inhibitor is 80.67% in the coal low-temperature oxidation process, compared to the raw coal, the heat release of coal treated with the composite solid lipid inhibitor was decreased by 507.65 J g−1, the maximum amount of heat emitted was lowered by 60%, and the flammability index was reduced by 56.4. A composite solid lipid inhibitor containing quercetin developed in this paper indicated high effectiveness in inhibiting CSC, which is vital for coping with the safety management of coal mine production. [ABSTRACT FROM AUTHOR]