Resources and economic analyses of underground coal gasification in India

Khadse, Anil N.

doi:10.1016/j.fuel.2014.10.057

Cited by 40 publications

(13 citation statements)

References 13 publications

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“…On the transition pore scale, the pore volumes of the HS coal samples vary slightly in the range of 50-100°C; in the range of 100-300°C, the pore volumes decrease significantly with the increase of the temperature, and the pore volumes of the XG coal samples decrease as a whole with an increase of the temperature, although the variation was small. On the mesopore scale, in the range of 50-200°C, the pore volumes of the HS and XG coal samples increase with the increase of the temperature 4 Geofluids but slowly in the range of 50-100°C and sharply in the range of 100-200°C; they also decrease sharply with the increase of the temperature in the range of 200-300°C; thus, the pore volumes of the XG coal samples change less than that of the HS coal samples. On the macropore scale, the pore volumes of the XG and HS coal samples remain almost unchanged in the range of 50-100°C, and within the range of 100-200°C, the pore volumes of the XG coal samples are almost unchanged; however, the pore volumes of the HS coal samples increase slightly with the increase of the temperature.…”

Section: The Variation Of the Pore Size Distribution With Thementioning

confidence: 96%

“…In recent years, there have been many means to achieve coal conversion and comprehensive utilization, including underground coal gasification and geothermal mining [1,2]. Underground coal gasification is a kind of clean coal comprehensive utilization technology that is converted into combustible gas in situ by a thermochemical reaction [3,4]. This technology is one of the important ways to achieve coal conversion, which improves the energy structure, enhances the safety of coal mine production, and considerably improves the resource recovery rate [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Liu

Zhang

et al. 2020

Geofluids

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Underground coal gasification and exploitation of geothermal mine resources can effectively improve coal conversion and utilization efficiency, and the basic theory of the above technologies generally relies on the change law of the coal pore structure under thermal damage. Therefore, the influence mechanism of the development of the coal pore structure under thermal damage is analyzed by the nuclear magnetic resonance experiment, and the temperature-permeability fractal model is created. The results show that compared with microtransitional pores, the volume of meso-macropores in the coal body is more susceptible to an increase in temperature, which was most obvious at 200-300°C. During the heating process, the measured fractal dimension based on the T2 spectral distribution is between 2 and 3, indicating that the fractal characteristics did not disappear upon a change in external temperature. The temperature has a certain negative correlation with DmNMR, DMNMR, and DNMR, indicating that the complexity of the pore structure of the coal body decreased gradually with the increase of the temperature. Compared with the permeability calculated based on the theoretical permeability fractal model, the permeability obtained from the temperature-permeability fractal model has a similar increasing trend as the permeability measured by the NMR experiment when the temperature increases. The experimental study on pore structure and permeability characteristics of the low metamorphic coal under thermal damage provides a scientific theory for underground coal gasification and geothermal exploitation.

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Section: The Variation Of the Pore Size Distribution With Thementioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Liu

Zhang

et al. 2020

Geofluids

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“…2). Most of the coal reserves have high ash content (25-60%) 3 and are available at depths exceeding 300 m rendering them less suited for conventional mining techniques 4 . The advantage of pursuing the option of UCG is that the coal deposit present at great depth need not be removed and brought to surface.…”

Section: Globally the Sheen Of Coal-based Energy Production Is Slowlmentioning

confidence: 99%

Deployment of Underground Coal Gasification in India

Singan¹,

Ranade²

2017

Current Science

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“…It has been considered to be technologically feasible, economically attractive and environmentally friendly [3]. Up to now, numerous UCG laboratory experiments and field tests have been performed all around the world [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The environmental effect of underground coal gasification semi‐coke on confined groundwater

Chen

Xing

et al. 2016

Env Prog and Sustain Energy

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From the health and environmental point of view, the control of soluble metal elements and organic compounds in underground coal gasification (UCG) by-product is of great importance for groundwater protection. Unlike the leaching of gasification ash as well as leaching in normal pressure, the leaching of trace elements and organics from UCG semicoke into confined groundwater has received little concern. In this research, UCG model test of Inner Mongolia lignite was performed, the obtained UCG semi-coke was then soaked by applying stainless steel leaching column at 0.5, 1.0, 1.5 and 2.0 MPa with nitrogen as pressurizing agent, the concentrations of trace element and total organic carbons (TOC values) in lixiviums were finally determined by applying ICP-MS and TOC analyzer to investigate the slight leaching in confined groundwater. The results indicate that Cd, Co, Cr, Ni, Pb and V are undetected in all lixivium samples, and compared with soaking under normal pressure, the concentrations of As, Ba, Mn and Sr are lower in confined water. TOC values in lixivium samples approximately approach to the background value of groundwater, indicating that no extra organic compounds could be leached and TOC values also show the similar changing trend as As, Ba, Mn and Sr behave under normal and high pressures.

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Resources and economic analyses of underground coal gasification in India

Cited by 40 publications

References 13 publications

Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Deployment of Underground Coal Gasification in India

The environmental effect of underground coal gasification semi‐coke on confined groundwater

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