Inhibiting effect of CO<sub>2</sub> on the oxidative combustion thermodynamics of coal

Ren, Lifeng; Deng, Jun; Ma, Li; Wang, Weifeng

doi:10.1039/c9ra08875j

Cited by 31 publications

(17 citation statements)

References 37 publications

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“…The results showed that the oxidative heat evolution of pulverized coal has obvious stage characteristics of rst absorbing heat and then releasing heat. Other scholars [9][10][11][12] also came to a conclusion consistent with the above. Chang et al [13] investigated the oxidation pyrolysis of coal below 150℃ in Yangquan through a thermal analyzer.…”

Section: Introductionsupporting

confidence: 73%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

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Coal combustion in an oxygen-lean and multi-gas environment is a common exothermic phenomenon for coalfield fires, leading to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. A delay of ignition and heat release existed during the coal oxygen-lean combustion in O2/CO2/N2. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

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Section: Introductionsupporting

confidence: 73%

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Preprint

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“…In the physical simulation experiment, proper material selection would be crucial for the experiment [10,11]. With relevant simulation theory, simulation material should satisfy the simulation principle for fluid-solid coupling and other basic properties.…”

Section: Principle On Materials Selectionmentioning

confidence: 99%

Experimental Research on Simulation Material for Water‐Resisting Soil Layer in Mining Physical Simulation

Yang

Zhang

2020

Advances in Materials Science and Engineering

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This paper focuses on the failure mechanism of a water-resisting soil layer with both coal excavation and seepage effect. Being taken the simulation principle of fluid-solid coupling as the research basis, we have established a new kind of experimental material for fluid-solid physical simulation (FPS). The material adopts river sand and clay as the aggregates, besides engine oil and low-temperature grease that are used as the gelatinizing agents. According to the relevant property testing on the experimental material, the mechanical parameters and seepage parameters of the material totally match the parameters of the soil layer, which satisfy requirements of the fluid-solid coupling experiment. Simultaneously, we have solved abundant material property problems, such as the material disintegration with water and visuality of water seepage in the simulation. Next, we have built up the FPS model to simulate coal excavation under water-bearing strata with the specific material. The results indicated that in the FPS, movement and failure mechanism of the water-resisting soil layer agree with the in-situ monitoring results. In addition, the revolution law of a mining-induced crack is also fitting the actual data. The mechanism of submarine seepage and its parameters on the material and the prototype are similar. All research results would be necessary for controlling mining-induced destroying of clay water-resisting property. Meanwhile, the model demonstrates that selection of the material and coupling parameters is valid. Finally, we can alter the material matching to obtain the layer materials with various characteristics, which would be applied in extensive experiments for studying soil layer failure and seepage simulation.

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“…Li et al [30] researched the macro-characteristic indexes of coal samples at different O 2 concentrations (3%, 8%, 13%, 17%, and 21%) with the temperature ranging from 30 • C to 500 • C. Ma et al [31] probed into the thermokinetic characteristics of coal samples when they were heated from 30 • C to 800 • C under the N 2 atmosphere with O 2 concentrations being 5%, 9%, 13%, 17%, and 21%, respectively. Ren et al [32] explored the thermodynamic behavior of coal sample oxidation with O 2 concentrations being 8%, 14%, and 21% under the O 2 -N 2 -CO 2 atmosphere and the O 2 -N 2 atmosphere, respectively. Zhang et al [33] studied the thermogravimetric characteristics of coal oxidation and spontaneous combustion under the N 2 atmosphere with O 2 concentrations being 5%, 12.5%, and 21%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

Zhang

Wang

2020

Energies

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Inert gases can effectively inhibit coal spontaneous combustion. In this paper, the inhibition effect of inert gases (N2 and CO2) on coal spontaneous combustion was studied. In the low-temperature oxidation stage, the constant-temperature heat release and apparent activation energy of coal sample were measured and calculated by the C80 micro-calorimeter. In the high-temperature combustion stage, the critical temperature, maximum peak temperature, ignition temperature, and burn-out temperature of coal samples were analyzed by the synchronous thermal analyzer. The results demonstrate that with the decrease of O2 concentration, the oxidation heat release of coal samples drops gradually while the apparent activation energy increases gradually. In the N2 and CO2 atmospheres, as the O2 concentration is reduced to 1.5% and 3%, respectively, the value of apparent activation energy changes from negative to positive, and the spontaneous reaction transits to a nonspontaneous reaction. The TG-DTG (thermogravimetric-derivative thermogravimetric) curve of coal sample in the high-temperature combustion stage indicates that the critical temperature exhibits a W-shaped trend with the decrease of O2 concentration, which also leads to gradual increases of maximum peak temperature, ignition temperature, and burn-out temperature. The above results signify that increasing the inert gas concentration can gradually reduce the oxidation and combustion rate and improve the inhibition effect on coal spontaneous combustion. In addition, when the O2 concentration is the same, the inhibition effect of CO2 on coal spontaneous combustion is superior to that of N2.

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Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal

Cited by 31 publications

References 37 publications

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Experimental Research on Simulation Material for Water‐Resisting Soil Layer in Mining Physical Simulation

Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

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Inhibiting effect of CO2 on the oxidative combustion thermodynamics of coal

Cited by 31 publications

References 37 publications

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Experimental Research on Simulation Material for Water‐Resisting Soil Layer in Mining Physical Simulation

Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

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Inhibiting effect of CO₂ on the oxidative combustion thermodynamics of coal