Measurement of electrical resistivity of coal samples

Tiwary, Shreeman Narayan; Mukhdeo,

doi:10.1016/0016-2361(93)90315-s

Cited by 10 publications

(4 citation statements)

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“…The Langmuir volume decreases with higher temperature, which results in a smaller initial slope of the isotherm and leads to less gas adsorption in the coal. There are also several studies on the variations in coal resistivity after exposure to different temperatures . For example, Li et al .…”

Section: Introductionmentioning

confidence: 99%

“…There are also several studies on the variations in coal resistivity after exposure to different temperatures. [18][19][20][28][29][30][31] For example, Li et al 18 studied the variation in the electrical resistivity of a raw coal sample and coal briquette, and the results showed that the electrical resistivity of raw coal decreases rapidly with higher temperature, while that of coal briquette decreases slightly. Zhu et al 31 studied the variation in volume resistivity in the process of spontaneous combustion of coal and obtained the volume resistivity temperature model.…”

Section: Introductionmentioning

confidence: 99%

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Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect

2019

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The main objective of this study is to investigate the relationship between the CO2 adsorption capacity and electrical resistivity of coal. The H‐Sorb 2600 high pressure gas adsorption analyzer is used to measure the CO2 sorption capacity in the temperature range of 25–55°C for anthracite coal. In addition, the TH2811D LCR meter is used to examine the electrical resistivity of raw coal samples and coal briquettes from 15°C to 65°C. The results indicate that there is a critical pressure threshold depending on the coal types and the pattern of changes in CO2 adsorption capacity changes when this threshold is exceeded. The electrical resistivity of raw coal samples decreases linearly and then slightly decreases at temperatures above 45°C and the electrical resistivity decreases approximately linearly from 15°C to 65°C for the coal briquettes due to lower compactness compared with the raw coal samples. The CO2 adsorption capacity has a power function with the electrical conductivity of the raw coal samples and coal briquettes. The power exponent of the power function is related to the porosity of coal. The results of the experiments indicate that it is effective to estimate the CO2 adsorption capacity of coal from the electrical conductivity. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect

2019

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“…Coal is mainly composed of macromolecular organic matter with a hydrogenated aromatic nucleus and a condensed aromatic nucleus as the main structure, and contains a mixture of certain inorganic minerals and moisture (Chen et al, 2018). The conductivity of coal is generally poor, which is influenced by many factors, such as temperature, ash content, moisture, coal rank, coal structure, gas content and so on (Duba, 1977;Tiwary and Mukhdeo, 1993;Podder and Majumder, 2001;Krishnamurthy et al, 2009;Frederikse and Hosler, 2010;Lin et al, 2018). It is generally believed that the resistivity of coal is negatively correlated with moisture, mineral content, temperature and the degree of damage to the coal body (Kayal, 1982;Yang and Saunders, 1985;Dindi et al, 1989;Chen et al, 2011;Xu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Conductivity Changes in Coal during Methane Adsorption‐Desorption and their Influencing Factors

Chen

Guo

et al. 2019

Acta Geologica Sinica (Eng)

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During the processes of methane adsorption and desorption, the internal structure of coal changes, accordingly leading to changes in electrical conductivity. In this paper, using low rank coal seams of the Yan'an Formation in the Dafosi field as the research subject, the relationship between coal resistivity, methane adsorption quantity, and equilibrium pressure is analyzed through proximate analysis, mercury injection tests, low temperature liquid nitrogen adsorption tests, and coal resistivity measurements during methane adsorption and desorption. The results show that during the process of pressure rise and methane adsorption, the conductivity of coal increases, resulting from heat release from methane adsorption, coal matrix swelling and adsorbed water molecules replaced by methane, but the resistivity reduction gradually decreases. The relationship between coal resistivity and methane adsorption quantity and equilibrium pressure can be described by a quadratic function. During the processes of depressurization and desorption, the resistivity of coal rebounds slightly, due to decalescence of methane desorption, coal matrix shrinkage and water-gas displacement, and the relationship coincides with a linear function. Methane adsorption leads to irreversible changes in coal internal structure and enhances the coal conductivity, and resistivity cannot be restored to the initial level even after methane desorption. The resistivity and reduction rate of durain are higher than those of vitrain, with relatively greater homogeneous pore throat structure and fewer charged particles in the double electric layer. In addition, moisture can enhance the conductivity of coal and makes it change more complexly during methane adsorption and desorption.

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“…Most of the the IPCC framework emphasizes the use of nonpublished work on the electrical properties of coal fossil renewable resources to minimize the CO 2 has been limited to the solid coal core rock that emission risk under the 2 °C scenario [27,28]. Under measures either parallel or perpendicular to the such circumstances, renewable energy resources seam bedding plane [34,37]. The current work is are rapidly replacing the conventional coal designed to explore the electrical conductivity combustion energy production processes [4].…”

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confidence: 99%

A study on electrical resistivity characteristics of Pakistani coal char for earth grounding system

Zafar,

Abdul Rauf,

Hafiz Usama Qureshi

et al. 2023

JPIChE

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In this study we aim to investigate the electrical conductivity and physiochemical properties of the selected coal samples for their application in earth grounding systems. Three different ranked coals namely Thar brown lignite (BL), Chamalang bituminous coal (BC) and semi-anthracite Dera Adam Khail (SC) coals were selected and their respective chars were prepared at 4500 C and subjected to the ground resistivity potential test using the universal earth grounding tester. Through experiments, it was found that BL coal has the least reactivity value and best conducting properties for electric current, followed by the SC and BC in descending order. It has been suggested that high moisture content and dissolved salts may act like an electrolytic medium for current passage in BL that is the reason for low resistivity value. The presence of low conductivity minerals in small percentage having relatively higher mass could be the reason for higher resistivity value in coal samples. Moreover, compared to raw coals, prepared char samples showed an improvement in electric current conductivity and lowered the resistivity values for all the ranks of selected samples.

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Measurement of electrical resistivity of coal samples

Cited by 10 publications

References 4 publications

Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect

Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect

An Experimental Study on the Conductivity Changes in Coal during Methane Adsorption‐Desorption and their Influencing Factors

A study on electrical resistivity characteristics of Pakistani coal char for earth grounding system

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Measurement of electrical resistivity of coal samples

Cited by 10 publications

References 4 publications

Experiment study on the correlation between the CO2 adsorption capacity and electrical resistivity of coal with temperature effect

Experiment study on the correlation between the CO2 adsorption capacity and electrical resistivity of coal with temperature effect

An Experimental Study on the Conductivity Changes in Coal during Methane Adsorption‐Desorption and their Influencing Factors

A study on electrical resistivity characteristics of Pakistani coal char for earth grounding system

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Product

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Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect

Experiment study on the correlation between the CO₂ adsorption capacity and electrical resistivity of coal with temperature effect