A process model for underground coal gasification – Part-II growth of outflow channel

Samdani, Ganesh; Aghalayam, Preeti; Ganesh, Anuradda; Sapru, R.K.; Lohar, B.L.; Mahajani, Sanjay M.

doi:10.1016/j.fuel.2016.05.017

Cited by 24 publications

(7 citation statements)

References 10 publications

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“…14,[21][22][23] The mathematical models for ISCG found in the literature are much more varied because the process removes a large fraction of the coal formation, leading to various regions which have different governing phenomena. The major classes of ISCG models include process models, 24,25 coal block models, [26][27][28] coal wall models, 29 packed bed models, [30][31][32] channel models, 33,34 CFD models, [35][36][37] resource recovery models 17,38 and reservoir models. 39,40 Characteristic length and time scales…”

Section: Mathematical Modelsmentioning

confidence: 99%

Mathematical modelling of in situ combustion and gasification

Perkins

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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The total worldwide resources of oil sands, heavy oil, oil shale and coal far exceed those of conventional light oil. In situ combustion and gasification are techniques that can potentially recover the energy from these unconventional hydrocarbon resources. In situ combustion can be used to produce oil, especially viscous and immobile crudes, by heating the oil and reducing the viscosity of the hydrocarbon liquids allowing them to flow to production wells. In situ gasification can be used to convert deep carbonaceous materials into synthesis gas which can be used at surface for power generation and petrochemical applications. While both in situ combustion for oil recovery and in situ gasification of coal have been developed and demonstrated over many decades, the commercial applications of these techniques have been limited to date. There are many physical processes occurring during in situ combustion, including multi-phase flow, heat and mass transfer, chemical reactions in porous media and geomechanics. A key tool in analysing and optimising the technologies involves using numerical models to simulate the processes. This paper presents a brief review of mathematical modelling of in situ combustion and gasification with an emphasis on developing a generalised framework and describing some of the key challenges and opportunities.

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Section: Mathematical Modelsmentioning

confidence: 99%

Mathematical modelling of in situ combustion and gasification

Perkins

2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The UCG process model used in the present work is first developed by Samdani et al [13] for the growth of outflow channel in UCG process. It is based on compartment modeling approach i.e., the computational domain is divided into different sections and each section has three sub zones such as rubble zone representing the spalled coal particles on the heater plate, void zone representing the vacant space inside the heating chamber and roof zone representing the hanging coal block.…”

Section: Ucg Process Model For Spalling Apparatusmentioning

confidence: 99%

“…6. This pattern of compartments is decided based on RTD studies by CFD [13,14]. The rubble zone is modeled as a PFR with number of CSTRs connected in series.…”

Section: Ucg Process Model For Spalling Apparatusmentioning

confidence: 99%

Experimental studies on spalling characteristics of Indian lignite coal in context of underground coal gasification

Bhaskaran

Samdani

Aghalayam

et al. 2015

Fuel

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“…The temperature is generally between 200 and 600 °C . It can be seen that UCG is a complex physical and chemical process, − which mainly includes the flow, heat transfer, mass transfer, and pyrolysis of gasification agents and gasification products. − Among them, heat transfer runs through the whole changing process of UCG, which is one of the basic problems that need to be paid more attention to. In the oxidation zone, the semicoke layer burns under the action of the oxidizer, releasing a large amount of heat, which is transferred to the front of the coal seam, forming a reduction zone and a distillation drying zone.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Temperature Distribution and Evolution Law of Underground Lignite Gasification

Zhou

Chen

et al. 2022

ACS Omega

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To study the temperature distribution characteristics and evolution law of underground lignite gasifiers, a three-dimensional heat conduction model of underground lignite gasification was constructed. Moreover, the effects of different coal thicknesses, advance speeds of the flame working face, and surrounding rock types on the gasifier were analyzed. The results show that with the increase in the coal thickness, the transfer range and distance of temperature in the roof, floor, and coal seam gradually increase, as does the coal quantity in the three zones. The heat loss rate of the gasifier decreased gradually with the coal seam thickness. When the advance speed of the flame working face is 0.5 m/d, the ideal gasification coal thickness range of lignite is 2.5–17.5 m. With the increase in the gasification rate, the maximum transfer distance of temperature to the roof and floor, the average temperature of the gasifier, and the coal quantity of the three zones gradually increase. Conversely, the coal thickness corresponding to the intersection of the coal quantity of the oxidation and reduction zones and the heat loss rate of the gasifier gradually decrease. When the coal seam below 2.5 m is gasified, the gasification rate can be increased appropriately. When the coal seam is above 13 m, increasing the gasification rate will make the coal quantity in the oxidation zone close to or even higher than that in the reduction zone. Regarding the surrounding rock types comprising a combination of siltstone, mudstone, sandy mudstone, and fine sandstone, the most favorable roof and floor type for underground coal gasification is the combination of fine sandstone and sandy mudstone (without considering the sealing and mechanical properties). These results provide important theoretical support for the industrialization of underground coal gasification.

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A process model for underground coal gasification – Part-II growth of outflow channel

Cited by 24 publications

References 10 publications

Mathematical modelling of in situ combustion and gasification

Mathematical modelling of in situ combustion and gasification

Experimental studies on spalling characteristics of Indian lignite coal in context of underground coal gasification

Numerical Simulation of the Temperature Distribution and Evolution Law of Underground Lignite Gasification

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