Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar

Javed, Syed Bilal; Uppal, Ali Arshad; Bhatti, Aamer Iqbal; Samar, Raza

doi:10.1016/j.energy.2019.02.005

Cited by 16 publications

(9 citation statements)

References 29 publications

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“…In addition to these data, also obtained the composition of coal as a fuel by conducting the ultimate analysis in the Palembang Geoservice laboratory and also analyze the composition of syngas in the form of H2, O2, N2, CO, CO2 and CH4 conducted, using GC-MS (ASTM-D-2163) analyzer from PertaminaRU-III Plaju -Palembang. Gas samples from gasification are taken at the time when the syngas burned produces a constant fire [14].…”

Section: Resultsmentioning

confidence: 99%

Syngas Analysis of Lowrank Coal Gasification Downdraft Products with Variations in Air Flow Rate

Syarif¹,

Masnila²,

Indrayani³

et al. 2022

Atlantis Highlights in Engineering

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Coalgasificationistheprocessofconvertingsolidintoagasmixturethathasfuelvalue.Coalgasificationwillproducegas in the form of synthetic gas (syngas) with the main components consisting of carbon monoxide (CO), hydrogen(H2), and (CH4) gas. By converting coal using gasification as a clean energy producer, a blower as a regulator of air flow, cyclones as a tar separator and a gas cooler. The results of this study are the rate of fuel use, the rate of burning ash, the specific gestation rate, the specific gas production rate, the syngas flow rate, the flash point calorific value, and the efficiency of the classification process. The decrease in the combustion air flow rate will tend to make the combustion temperature and the calorific value become smaller so that the efficiency will also decrease. The best efficiency occurs at the largest airflow rate of 3.15 m/s with an efficiency of 84.62%. The increase in the mass of thehuskthatisfilteredwillcauseanincreaseinthecompositionofCH4andH2,aswellasadecreaseinCO2andCO.Byfilteringthe massof rice husks, the LHV value will increase.

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Section: Resultsmentioning

confidence: 99%

Syngas Analysis of Lowrank Coal Gasification Downdraft Products with Variations in Air Flow Rate

Syarif¹,

Masnila²,

Indrayani³

et al. 2022

Atlantis Highlights in Engineering

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“…The high temperature at the boundary of the combustion cavity leads to changes in the thermal stress effect and force in the surrounding rock layer, which may cause the collapse of the surrounding rock, groundwater influx, and other accidents. − In order to study the extension law of the combustion cavity, scholars at home and abroad have done in-depth research. Javed et al used a 3D axisymmetric combustion cavity simulation model (CAVSIM) to simulate hydrogeological conditions such as water intrusion rate and combustion cavity growth at the UCG project. The results showed that coke production, water influx, produced species flow rates, and heating value of syngas are largely influenced by combustion cavity growth.…”

Section: Introductionmentioning

confidence: 98%

“…Underground coal gasification (UCG) is an environmentally friendly coal mining technology, − helping to achieve China’s goal of “carbon emissions peak” and “carbon neutrality”. This technology converts coal into combustible gas in situ through a thermochemical reaction, which is characterized by low cost, high safety, and good environmental benefits. − As an important complement to traditional coal mining technology, UCG is now particularly suitable for the mining and utilization of low-grade, unacceptable coal seam and deep coal seams. , Many developed countries are developing and using related UCG projects; − China is also gradually entering the stage of industrial application of UCG after years of research, − and UCG has become an important part of the low carbon economy. − …”

Section: Introductionmentioning

confidence: 99%

“… 26 − 28 In order to study the extension law of the combustion cavity, scholars at home and abroad have done in-depth research. Javed et al 29 used a 3D axisymmetric combustion cavity simulation model (CAVSIM) to simulate hydrogeological conditions such as water intrusion rate and combustion cavity growth at the UCG project. The results showed that coke production, water influx, produced species flow rates, and heating value of syngas are largely influenced by combustion cavity growth.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Test of Combustion Cavity Growth during Underground Coal Gasification in the Early Stage of Ignition

Xin,

Wang,

et al. 2024

ACS Omega

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The growth parameters of the underground coal gasification (UCG) combustion cavity are important for the regulation of its gasification process. The irregular cavities formed in the early stages of ignition can affect the stability of the gasification process. In this study, a heat-solid coupling model is used to determine the combustion cavity boundary at the early stage of coal seam ignition to simulate the movement of the combustion cavity boundary by indirectly inheriting the coal seam temperature. It reveals the evolution of the temperature field, stress field, and plasticity zone at the combustion cavity boundary at the early stage of ignition in the UCG process and compares with the ex situ smallscale experiments. The simulation results show that in the early stage of ignition, the temperature transfer to the top of the coal seam and the direction of the gasification agent outlet pipeline is faster, while the transfer rate to the direction of the gasification agent inlet pipeline is slower. The main stresses are mainly distributed in the left and right sides of the combustion cavity and gradually increase directly above. The plastic zone is mainly distributed directly above the combustion cavity and arc-shaped plastic zones. The experimental results show that the temperature directly above the combustion cavity is higher than in the other directions, and the ash layer hinders the temperature transfer to the bottom. Therefore, the combustion cavity has a longer elliptical shape in the upper part, which is consistent with the simulation results. The model better reveals the extension law of the combustion cavity at the early stage of UCG ignition and provides theoretical guidance for the study of combustion cavity formation.

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“…Pakistan is considered a coal-rich country after the discovery of lignite-B type coalfield reserves (175.5 billion tonnes) in Tharparker district of Sindh province which covers an area of over 9,100 sq.km [5,6,7]. Due to the on-site geological conditions and type of the coal, UCG is the most suitable and environment friendly technology to harness these coal reserves and to overcome the shortfall of energy in Pakistan [8,9]. Computational modelling and simulation tools are important to address the feasibility studies and quantitative understanding of a complex process like UCG before a field scale test.…”

Section: Introductionmentioning

confidence: 99%

Galerkin Finite Element Based Modeling of One Dimensional Packed Bed Reactor for Underground Coal Gasification (UCG) Process

et al. 2020

Self Cite

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Mathematical models of a complex physicochemical underground coal gasification process involve multidimensional non-linear partial differential equations (PDEs). Therefore, researchers always seek a suitable numerical scheme that would give a good balance between accuracy of the solution and computational complexity. In this paper, the non-linear PDEs describing energy and mass balances of both coal and char are solved by Galerkin finite element method (GFEM). The infinite-dimensional spatial domain is transformed into a finite number of elements, whose dynamics are governed by a system of ordinary differential equations (ODEs). Owing to the execution of GFEM, the time domain and spacedependent first-order ODEs for solids (coal and char) and gases are solved numerically to find a solution of the UCG process. The resultant syngas compositions and the calibrated heating value are influenced by the operation parameters and the type of oxidant used. The results are compared with the experimental data obtained from the Thar coal UCG site, and with existing work, based on the finite difference method (FDM) for the one dimensional (1D) model. The simulated results along with the quantitative analysis show the superiority of the GFEM model over the FDM model.

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Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar

Cited by 16 publications

References 29 publications

Syngas Analysis of Lowrank Coal Gasification Downdraft Products with Variations in Air Flow Rate

Syngas Analysis of Lowrank Coal Gasification Downdraft Products with Variations in Air Flow Rate

Modeling Test of Combustion Cavity Growth during Underground Coal Gasification in the Early Stage of Ignition

Galerkin Finite Element Based Modeling of One Dimensional Packed Bed Reactor for Underground Coal Gasification (UCG) Process

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