Technological aspects of underground coal gasification in the Experimental “Barbara” Mine

Wiatowski, Marian; Kapusta, Krzysztof; Świądrowski, J.; Cybulski, Krzysztof; Ludwik-Pardała, Magdalena; Grabowski, J.; Stańczyk, Krzysztof

doi:10.1016/j.fuel.2015.07.001

Cited by 45 publications

(20 citation statements)

References 14 publications

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“…This fact indicates that the gasification reactions are promoted under high temperature in the gasification regions as a result of the increase of the oxygen inflow to activate the oxidation reaction. Balance computation is a useful method to discuss the amount of coal reacted in the UCG process [25]. The amount of gasified coal is calculable by the balance of the C element, as shown in Table 3.…”

Section: Temperature and Aementioning

confidence: 99%

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Hamanaka

Itakura

et al. 2017

Energies

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Underground coal gasification (UCG) is a technique to recover coal energy without mining by converting coal into a valuable gas. Model UCG experiments on a laboratory scale were carried out under a low flow rate (6~12 L/min) and a high flow rate (15~30 L/min) with a constant oxygen concentration. During the experiments, the coal temperature was higher and the fracturing events were more active under the high flow rate. Additionally, the gasification efficiency, which means the conversion efficiency of the gasified coal to the product gas, was 71.22% in the low flow rate and 82.42% in the high flow rate. These results suggest that the energy recovery rate with the UCG process can be improved by the increase of the reaction temperature and the promotion of the gasification area.

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Section: Temperature and Aementioning

confidence: 99%

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Hamanaka

Itakura

et al. 2017

Energies

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“…Composition and calorific value of the product gas depend largely on the gasifying agent employed, thermodynamic conditions of the operation, coal rank and local hydrogeological conditions [16][17][18][19][20]. Several examples exist in literature demonstrating that under appropriate control of the process, the UCG could be oriented on the production of a specific product, such as hydrogen [21][22][23][24][25][26][27].…”

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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“…Next, the gas quality, gasification efficiency, and coal consumed in the tests were estimated to discuss the energy recovery using the stoichiometric approach proposed in our previous work [43]. For comparison, the method of balance computation (reported by Wiatowski et al [44]) was also applied to investigate the coal consumption during the gasification process. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, as an important appraisal, a few data are available on the evaluation of the product gas energy from distinct underground gasification reactors. In this study, a useful method of balance computation [44] is applied to discuss the amount of coal gasified over the experiment. Additionally, the amount of coal consumption is compared with the results from a proposed stoichiometric method (reported in our previous work [43]) which can be calculated by the product gas composition and oxygen injection rate.…”

Section: Evaluation Of Coal Consumptionmentioning

confidence: 99%

Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system

Hamanaka

Itakura

et al. 2018

Applied Energy

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In this study, to better simulate underground coal gasification (UCG), an artificial coal seam was constructed to use as a simulated underground gasifier, which comprised coal blocks excavated from the coal seam. This study reports the process and results of three independently designed experiments using coaxial-hole and linking-hole UCG models: a) a coaxial model using a coaxial pipeline as a gasification channel, b) a coaxial model using the coaxial pipeline combined with a bottom cross-hole, and c) a linking-hole model using a horizontal V-shaped cross-hole. In the present work, the fracturing activities and cavity growth inside the reactor were monitored with acoustic emission (AE) technologies. During the process, the temperature profiles, gas production rate, and gas content were measured successively. The results show that AE activities monitored during UCG process are significantly affected by operational variables such as feed gas rate, feed gas content, and linking-hole types. Moreover, the amount of coal consumed during UCG process were estimated using both of the stoichiometric approach and balance computation of carbon (C) based on the product gas contents. A maximum error of less than 10% was observed in these methods, in which the gas leakage was also considered. This demonstrates that the estimated results using the proposed stoichiometric approach could be useful for evaluating energy recovery during UCG.

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Technological aspects of underground coal gasification in the Experimental “Barbara” Mine

Cited by 45 publications

References 14 publications

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

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

Monitoring and evaluation of simulated underground coal gasification in an ex-situ experimental artificial coal seam system

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