Temperature effects on thermal diffusivity of bituminous coal using different pre-oxidation levels in a nitrogenous atmosphere

Yin, Liang; Xiao, Yang; Zhong, Kai-Qi; Shu, Chi‐Min; YiShui, Tian

doi:10.1016/j.fuel.2020.119640

Cited by 23 publications

(5 citation statements)

References 28 publications

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“…In the future, it may be necessary to conduct similar analyses of lignite gasification and hydrogen production using domestic resources to examine various possibilities for realizing a low-carbon energy system through hydrogen energy. Similarly, we note that conducting life-cycle analysis to include economic, social, and other environmental impacts as a part of multiple criteria analyses will also be increasingly important for the deliberation of hydrogen's potential role as an energy medium [58][59][60][61].…”

Section: Discussionmentioning

confidence: 99%

Assessing Uncertainties of Life-Cycle CO2 Emissions Using Hydrogen Energy for Power Generation

Ozawa

Kudoh

2021

Energies

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Hydrogen and its energy carriers, such as liquid hydrogen (LH2), methylcyclohexane (MCH), and ammonia (NH3), are essential components of low-carbon energy systems. To utilize hydrogen energy, the complete environmental merits of its supply chain should be evaluated. To understand the expected environmental benefit under the uncertainty of hydrogen technology development, we conducted life-cycle inventory analysis and calculated CO2 emissions and their uncertainties attributed to the entire supply chain of hydrogen and NH3 power generation (co-firing and mono-firing) in Japan. Hydrogen was assumed to be produced from overseas renewable energy sources with LH2/MCH as the carrier, and NH3 from natural gas or renewable energy sources. The Japanese life-cycle inventory database was used to calculate emissions. Monte Carlo simulations were performed to evaluate emission uncertainty and mitigation factors using hydrogen energy. For LH2, CO2 emission uncertainty during hydrogen liquefaction can be reduced by using low-carbon fuel. For MCH, CO2 emissions were not significantly affected by power consumption of overseas processes; however, it can be reduced by implementing low-carbon fuel and waste-heat utilization during MCH dehydrogenation. Low-carbon NH3 production processes significantly affected power generation, whereas carbon capture and storage during NH3 production showed the greatest reduction in CO2 emission. In conclusion, reducing CO2 emissions during the production of hydrogen and NH3 is key to realize low-carbon hydrogen energy systems.

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Section: Discussionmentioning

confidence: 99%

Assessing Uncertainties of Life-Cycle CO2 Emissions Using Hydrogen Energy for Power Generation

Ozawa

Kudoh

2021

Energies

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“…First, with an increase in temperature, TD decreases. At this time, the average free path of phonons decreases with the increase in temperature, which affects the decrease in TD [44][45][46]. However, as the temperature approached 210 °C, the molecular structure of the coal changed.…”

Section: Thermal Diffusivitymentioning

confidence: 98%

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

Xiao

Zhang

et al. 2021

J Therm Anal Calorim

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Coal spontaneous combustion (CSC) is a major safety concern affecting not just miners and businesses, but of industry in China generally. Chemical methods are already widely applied in the field of CSC prevention and plays a vital role in suppressing its negative effects. Ionic liquids (ILs) are novel and environmentally friendly solvents that have shown possible inhibitory effects on CSC through controlling the reactive groups in coal's molecular structure. To study the effects of various ILs on CSC more thoroughly, this paper examined several types of IL that had been pre-treated for different periods and examined how they performed during different phases of the combustion process. A long flame coal type was selected and immersed in four ILs [BMIM][BF 4 ], [BMIM][NO 3 ], [BMIM][I], and [EMIM][BF 4 ]. Immersion periods were 2 days, 3 months, and 6 months; a raw coal sample was retained as a control. LFA 457 laser-flash apparatus determined the thermophysical properties of the samples between 30 and 300 °C. The kinetic process of the samples (30-800 °C) was deduced by thermogravimetric-differential scanning calorimetry thermal at various heating rates (2, 5, 10, and 15 °C min −1 ), and the thermal effect parameters were obtained. Results from this paper show that immersion treatment using ILs has an inhibitory effect on CSC, and the reliability of the thermophysical parameters was verified by uncertainty analysis. The pre-treated samples characteristics and exothermic peak temperature with different degrees of hysteresis were recorded, and statistical analysis verified the conclusions from the thermal physics experiments. The pre-treated sample with the greatest lag over various stages was found, and the apparent activation energy (E a ) of its rapid oxidation stage was calculated by Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods. Meanwhile, the two kinetic methods confirm each other and come to a conclusion after joint verification. The greatest E a found here was for a 6-month immersion coal sample using the IL [BMIM][BF 4 ].

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“…The activating additive Cu(NO3)2 effect on the process of thermal decomposition of brown and black coals under the conditions of changes in the gas medium composition was investigated [4]. The mechanism of coal interaction with sodium nitrite [5] and thermal diffusivity in two bituminous coals of Ewirgol and Sangshuping coal mines was studied [6]. It was shown [6] that with the increase of the oxidation temperature, the interlayer spacing of the aromatic microcrystalline structures decreases.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of coal interaction with sodium nitrite [5] and thermal diffusivity in two bituminous coals of Ewirgol and Sangshuping coal mines was studied [6]. It was shown [6] that with the increase of the oxidation temperature, the interlayer spacing of the aromatic microcrystalline structures decreases. During the interaction between pyridine and both oxidized bituminous coal and the fresh subbituminous coal the presence of both pyridinium ions and physically sorbed pyridine was observed by means of CPMAS 15 N NMR [7].…”

Section: Introductionmentioning

confidence: 99%

NMR study of the electrolyte diffusion in bituminous coal

Altshuler,

Malyshenko,

Lyrshchikov

et al. 2023

E3S Web Conf.

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The transfer of the electrolyte molecules (H2SO4 or H3PO4) into bituminous coal was studied by the method of solid-state NMR spectroscopy. The kinetic dependences of the electrolytes transfer into a coal membrane from an aqueous solution have been obtained. It was shown that the transfer of H2SO4 molecules into a coal thin layer is determined by the solid phase diffusion. The process was investigated in the framework of a mathematical model of diffusion in layered media. When the flow of electrolyte is directed perpendicular to the surface of the layer the diffusion coefficient of sulfuric acid in the coal equals 1∙10-13 m2/s. The diffusion coefficient of H2SO4 in the bituminous coal is four order of less than the self-diffusion coefficient of proton in aqueous solution. The diffusion process of the electrolyte delivery may be the rate-limiting stage preceding chemical transformations with the H2SO4 participation in bituminous coal.

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Temperature effects on thermal diffusivity of bituminous coal using different pre-oxidation levels in a nitrogenous atmosphere

Cited by 23 publications

References 28 publications

Assessing Uncertainties of Life-Cycle CO2 Emissions Using Hydrogen Energy for Power Generation

Assessing Uncertainties of Life-Cycle CO2 Emissions Using Hydrogen Energy for Power Generation

Testing inhibitory effects of a panel of ionic liquids on differing phases of coal spontaneous combustion

NMR study of the electrolyte diffusion in bituminous coal

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