Thermophysical properties of coal measure strata under high temperature

Tang, Furong; Wang, Lianguo; Lu, Yinlong; Yang, Xianqing

doi:10.1007/s12665-015-4364-0

Cited by 34 publications

(9 citation statements)

References 37 publications

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“…It involves the inclusion of the constitutive relationship that describes the temperature or pressure dependent material parameter and key processes. Specifically, the heat capacity and thermal conductivity of various rocks are introduced as temperature-dependent constitutive relationships (Kosowska-Golachowska et al, 2014;Otto and Kempka, 2015;Tang et al, 2015;Zagorščak et al, 2019). Furthermore, geochemical reactions are considered via the equilibrium/kinetic adsorption/desorption module in COMPASS (Hosking et al, 2018).…”

Section: The Developed Numerical Methods and Code Introductionmentioning

confidence: 99%

A numerical investigation into the environmental impact of underground coal gasification technology based on a coupled thermal-hydro-chemical model

Zagorščak

Thomas

et al. 2021

Journal of Cleaner Production

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Section: The Developed Numerical Methods and Code Introductionmentioning

confidence: 99%

A numerical investigation into the environmental impact of underground coal gasification technology based on a coupled thermal-hydro-chemical model

Zagorščak

Thomas

et al. 2021

Journal of Cleaner Production

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“…6−12 On the basis of thermophysical property data, the study of the expansion of the burned-out areas, thermal conduction, and temperature field distribution of the surrounding rocks in the process of underground coal gasification is possible. 13 The heat transfer process from coal fires is a complex phenomenon. 14 The fire systems involve transient mass and heat transfer, reaction kinetics, and fluid dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Above this temperature range, thermal conductivity and diffusivity increase rapidly. Tang et al 13 reported the heat capacity and thermal conductivity data as a function of temperature from 373 to 1273 K for six types of rock samples from the coal measure strata, and the measured data were compared with theoretical predictions. The authors used the hot-wire method (transient-state) to measure of the thermal conductivity of coal.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on the Thermal Conductivity of Black Coal

2018

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The guarded parallel-plate technique was employed on a black coal sample for an accurate measurement of the thermal conductivity over the temperature range from 298 to 496 K. The combined expanded uncertainties of the temperature (T) and thermal-conductivity (λ) measurements at the 95% confidence level with a coverage factor of k = 2 are estimated to be 20 mK and 5%, respectively. It was experimentally observed that the measured thermal conductivity (λ) of the wet and dry coal samples increases with temperature passes through a maximum around 390 K, and then it decreases gradually at higher temperatures. We attribute this maximum to the evolution of the volatile matter (VM) (devolatilazation) and aromatization of the carbon (pyrolysis), which is known to occur under heat treatment, and therefore, tends to increase the thermal conductivity. Over the experimental temperature range, the measured thermal-conductivity varied from 0.341 to 0.497 W·m–1·K–1 for wet coal samples before thermal treatment and from 0.272 to 0.316 W·m–1·K–1 for dry samples after thermal treatment. A considerable difference in thermal conductivity behavior was observed for the primary (originally nonthermally treated) and the second (thermally treated) repeated run. No temperature maximum or minimum (regular behavior) was observed in the thermal conductivity behavior for the thermally treated coal sample. The observed temperature behavior of the black coal’s thermal conductivity (λ) is a result of the complexity of the temperature behaviors of a, C P, and ρ, i.e., is the superposition of various temperature behaviors of a, C P, and ρ, and it reflects the temperature behavior of the heat capacity. This means that the temperature behavior of C P dominates the thermal diffusivity in λ = ρaC P. This means that the temperature behavior of λ and C P is strongly correlated.

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“…During thermal treatment the physical properties of the rock change remarkably, which further alters its tensile mechanical properties [9][10][11][12][13][14][15]. Based on previous analyses and conclusions, it is known that heat plays an important role in the weakening of mechanical properties of rocks.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heating Rate on the Dynamic Tensile Mechanical Properties of Coal Sandstone during Thermal Treatment

Mao

et al. 2017

Shock and Vibration

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The effects of coal layered combustion and the heat injection rate on adjacent rock were examined in the process of underground coal gasification and coal-bed methane mining. Dynamic Brazilian disk tests were conducted on coal sandstone at 800 ∘ C and slow cooling from different heating rates by means of a Split Hopkinson Pressure Bar (SHPB) test system. It was discovered that thermal conditions had significant effects on the physical and mechanical properties of the sandstone including longitudinal wave velocity, density, and dynamic linear tensile strength; as the heating rates increased, the thermal expansion of the sandstone was enhanced and the damage degree increased. Compared with sandstone at ambient temperature, the fracture process of heat-treated sandstone was more complicated. After thermal treatment, the specimen had a large crack in the center and cracks on both sides caused by loading; the original cracks grew and mineral particle cracks, internal pore geometry, and other defects gradually appeared. With increasing heating rates, the microscopic fracture mode transformed from ductile fracture to subbrittle fracture. It was concluded that changes in the macroscopic mechanical properties of the sandstone were result from changes in the composition and microstructure.

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Thermophysical properties of coal measure strata under high temperature

Cited by 34 publications

References 37 publications

A numerical investigation into the environmental impact of underground coal gasification technology based on a coupled thermal-hydro-chemical model

A numerical investigation into the environmental impact of underground coal gasification technology based on a coupled thermal-hydro-chemical model

Temperature Effect on the Thermal Conductivity of Black Coal

Effects of Heating Rate on the Dynamic Tensile Mechanical Properties of Coal Sandstone during Thermal Treatment

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