Study on Influencing Factors of Thermal Analysis Experiment on Coal Oxidation and Spontaneous Combustibility

2014 ◽  
Vol 977 ◽  
pp. 213-217
Author(s):  
Hua Yang ◽  
Kai Wang ◽  
Yan Ni Zhang
Keyword(s):  
Thermal Analysis ◽  
Spontaneous Combustion ◽  
Particle Sizes ◽  
Characteristic Parameters ◽  
Coal Oxidation ◽  
Heating Rates ◽  
Sample Quality ◽  
Analysis Experiment ◽  
Thermal Analysis Experiment

To ensure the accuracy and stability of results of coal oxidation and spontaneous combustion in the process of thermal analysis experiment, the speed and time of coal oxidation must be moderate, and the characteristic parameters in the oxidation process can be fully reflected. Thermal analysis experiment at different heating rates, with several particle sizes and different sample quality, Huangling coal sample as the research object, were carried out in this paper. Results showed that the particle size of 0.075 mm to 0.109 mm, sample quality of 5 mg and the heating rate of 10 K•min-1could ensure the fully oxidation and pyrolysis of coal, under which conditions coal spontaneous combustion characteristics could be reflected by the characteristic temperatures.

scholarly journals Inhibiting effect of CO2 on the oxidative combustion thermodynamics of coal

RSC Advances ◽  
2019 ◽  
Vol 9 (70) ◽  
pp. 41126-41134 ◽  
Author(s):  
Li-Feng Ren ◽  
Qing-Wei Li ◽  
Jun Deng ◽  
Xiao Yang ◽  
Li Ma ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermal Analysis ◽  
Thermal Behavior ◽  
Oxygen Concentration ◽  
Coal Oxidation ◽  
Inhibiting Effect ◽  
Analysis Experiment ◽  
Thermal Analysis Experiment

The effect of carbon dioxide and oxygen concentration on thermal behavior of coal oxidation and combustion of coal were investigated using an STA449F3 thermal analysis experiment.

scholarly journals Investigation of the kinetics of spontaneous combustion of the major coal seam in Dahuangshan mining area of the Southern Junggar coalfield, Xinjiang, China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Li Shen ◽  
Qiang Zeng
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Coal Seam ◽  
Spontaneous Combustion ◽  
Heating Temperature ◽  
Characteristic Temperature ◽  
Mining Area ◽  
Particle Sizes ◽  
Coal Oxidation ◽  
Increasing Temperature

AbstractIn the present paper, with using diverse methods (including the SEM, the XRD, the TPO, the FTIR, and the TGA) , the authors analysed samples of the major coal seam in Dahuangshan Mining area with different particle sizes and with different heated temperatures (from 50 to 800 °C at regular intervals of 50 °C). The results from SEM and XRD showed that high temperature and high number of pores, fissures, and hierarchical structures in the coal samples could facilitate oxidation reactions and spontaneous combustion. A higher degree of graphitization and much greater number of aromatic microcrystalline structures facilitated spontaneous combustion. The results from TPO showed that the oxygen consumption rate of the coal samples increased exponentially with increasing temperature. The generation rates of different gases indicated that temperatures of 90 °C or 130 °C could accelerate coal oxidation. With increasing temperature, the coal oxidation rate increased, and the release of gaseous products was accelerated. The FTIR results showed that the amount of hydroxide radicals and oxygen-containing functional groups increased with the decline in particle size, indicating that a smaller particle size may facilitate the oxidation reaction and spontaneous combustion of coal. The absorbance and the functional group areas at different particle sizes were consistent with those of the heated coal samples, which decreased as the temperature rose. The results from TGA showed that the characteristic temperature T3 declined with decreasing particle size. After the sample with 0.15–0.18 mm particle size was heated, its carbon content decreased, and its mineral content increased, inhibiting coal oxidation. This result also shows that the activation energy of the heated samples tended to increase at the stage of high-temperature combustion with increasing heating temperature.

Particle Size Effect on FeS Spontaneous Combustion Characters in Petroleum

2014 ◽  
Vol 608-609 ◽  
pp. 971-975
Author(s):  
Man Yang ◽  
Xian Feng Chen ◽  
Yu Jiao Shang ◽  
Ren Dong Bao
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Reaction Mechanisms ◽  
Spontaneous Combustion ◽  
Oxidation Kinetic ◽  
Mesh Size ◽  
Particle Size Effect ◽  
Particle Sizes ◽  
Heating Rates ◽  
Effect Of Particle Size

In order to evaluate the effect of particle size on FeS Spontaneous Combustion Characters, four different grain diameters of FeS particles (100, 170, 220, 320-mesh) were detected in the experiment. The reaction process at heating rates of 5°C /min in air flow from 30°C to 900°C were studied by TG-DSC and oxidation kinetic analysis. The activation energies of samples were calculated by the Coats-Redfern method. It is found that four reaction mechanisms are involved in FeS spontaneous combustion for different particle sizes; the activation energy values change from 307.4 to 398.05 kJ/mol; larger size particles have higher activation energy values; so grain diameters larger than 100-mesh size samples are less inclined to be oxidized and self-ignited.

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