Ex-situ experimental simulation of hard coal underground gasification at elevated pressure

Wiatowski, Marian; Kapusta, Krzysztof; Ludwik-Pardała, Magdalena; Stańczyk, Krzysztof

doi:10.1016/j.fuel.2016.07.020

Cited by 35 publications

(21 citation statements)

References 24 publications

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“…Unlike the techniques used in NG production, the UCG process involves both physical (drilling) and chemical processes. During the UCG process, methane is formed in a methanation reaction (gas phase): CO + 3H 2 → CH 4 +H 2 O ∆H = −206 kJ/mol and through a direct hydrogenation of solid carbon (hydrogasification reaction): C + 2H 2(g) → CH 4(g) ∆H = −91.0 kJ/mol Both reactions are favored by the increased pressure [29,30]. Gasification pressure depends on the seam depth, which affects the hydrostatic pressure in the coal seam, and hence the allowable range for the pressure in the underground reactor.…”

Section: Introductionmentioning

confidence: 99%

Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure

et al. 2020

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An experimental campaign on the methane-oriented underground coal gasification (UCG) process was carried out in a large-scale laboratory installation. Two different types of coal were used for the oxygen/steam blown experiments, i.e., “Six Feet” semi-anthracite (Wales) and “Wesoła” hard coal (Poland). Four multi-day gasification tests (96 h continuous processes) were conducted in artificially created coal seams under two distinct pressure regimes-20 and 40 bar. The experiments demonstrated that the methane yields are significantly dependent on both the properties of coal (coal rank) and the pressure regime. The average CH4 concentration for “Six Feet” semi-anthracite was 15.8%vol. at 20 bar and 19.1%vol. at 40 bar. During the gasification of “Wesoła” coal, the methane concentrations were 10.9%vol. and 14.8%vol. at 20 and 40 bar, respectively. The “Six Feet” coal gasification was characterized by much higher energy efficiency than gasification of the “Wesoła” coal and for both tested coals, the efficiency increased with gasification pressure. The maximum energy efficiency of 71.6% was obtained for “Six Feet” coal at 40 bar. A positive effect of the increase in gasification pressure on the stabilization of the quantitative parameters of UCG gas was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure

et al. 2020

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“…The UCG process is difficult to control in the subsurface. Hence, much effort has been invested into feasibility assessments and technology development by high-pressure experimental testing to increase its efficiency and stability (e.g., [52,[55][56][57]). Wiatowski et al [52] conducted experimental simulations of UCG, using large bulk samples of two lignites in an ex situ laboratory installation.…”

Section: Model Validation Against Ucg Experimental Datamentioning

confidence: 99%

Synthesis Gas Composition Prediction for Underground Coal Gasification Using a Thermochemical Equilibrium Modeling Approach

Otto

Kempka

2020

Energies

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Underground coal gasification (UCG) is an in situ conversion technique that enables the production of high-calorific synthesis gas from resources that are economically not minable by conventional methods. A broad range of end-use options is available for the synthesis gas, including fuels and chemical feedstock production. Furthermore, UCG also offers a high potential for integration with Carbon Capture and Storage (CCS) to mitigate greenhouse gas emissions. In the present study, a stoichiometric equilibrium model, based on minimization of the Gibbs function has been used to estimate the equilibrium composition of the synthesis gas. Thereto, we further developed and applied a proven thermodynamic equilibrium model to simulate the relevant thermochemical coal conversion processes (pyrolysis and gasification). Our modeling approach has been validated against thermodynamic models, laboratory gasification experiments and UCG field trial data reported in the literature. The synthesis gas compositions have been found to be in good agreement under a wide range of different operating conditions. Consequently, the presented modeling approach enables an efficient quantification of synthesis gas quality resulting from UCG, considering varying coal and oxidizer compositions at deposit-specific pressures and temperatures.

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“…The life cycle inventory analysis involved data collection and the implementation of the model to quantify relevant inputs and outputs of the individual subsystems and unit processes. The work reported here uses process simulation models developed in the Aspen Plus ® software, which have been validated against experimental studies (Wiatowski, et al, 2016;Andrianopoulos, 2018).…”

Section: Consumables Productionmentioning

confidence: 99%

Life Cycle Environmental Impact Assessment of Coupled Underground Coal Gasification and CO2 Capture and Storage: Alternative End Uses for the UCG Product Gases

2019

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Ex-situ experimental simulation of hard coal underground gasification at elevated pressure

Cited by 35 publications

References 24 publications

Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure

Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure

Synthesis Gas Composition Prediction for Underground Coal Gasification Using a Thermochemical Equilibrium Modeling Approach

Life Cycle Environmental Impact Assessment of Coupled Underground Coal Gasification and CO2 Capture and Storage: Alternative End Uses for the UCG Product Gases

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