Dynamic experimental simulation of hydrogen oriented underground gasification of lignite

Stańczyk, Krzysztof; Smoliński, Adam; Kapusta, Krzysztof; Wiatowski, Marian; Świądrowski, J.; Kotyrba, Andrzej; Rogut, Jan

doi:10.1016/j.fuel.2010.03.004

Cited by 80 publications

(44 citation statements)

References 10 publications

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“…Then, oxygen and steam are injected alternately in 1.5-2.0 h intervals. We use the same coal composition and injection rate in our model and compare the average composition of the product gas and the temperature profile that are reported by [18] with the results of our model. The results are reported in Table 1 [16].…”

Section: Model Validationmentioning

confidence: 99%

“…We can draw the following conclusion from Table 1: • In the steam injection cycle, which is the cycle that produces the most valuable product, our model is in excellent agreement with the field data, with the exception of CH 4 concentration. Given the low reaction rate of methane formation, the 10% methane composition that is reported by [18] is probably a result of coal pyrolysis that is included in our model but not considered in the simulations (we assumed that the composition of the coal before and after pyrolysis are the same)…”

Section: Model Validationmentioning

confidence: 99%

“…In this process, the air injection period serves to heat up the coal and the surrounding strata, and the steam injection period serves to produce high quality gas recuperating the heat from the surrounding strata [17][18][19][20]. Here, we use the results of the model to perform an energy and exergy analysis on the whole process.…”

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analysis of alternating injection of oxygen and steam in the low emission underground gasification of deep thin coal

et al. 2017

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• We model UCG process with alternating injection of steam/oxygen.• We used exergy analysis to investigate the practicality of the process.• We show that the alternating injection UCG is practical at low pressure.• Zero emission conversion of coal is not currently practical.• Co-injection of steam/oxygen results in a higher recovery of coal. A R T I C L E I N F O Keywords:Underground coal gasification Alternating injection Exergy analysis Carbon capture and storage A B S T R A C TRecent studies have shown that by coupling the underground coal gasification (UCG) with the carbon capture and storage (CCS), the coal energy can be economically extracted with a low carbon footprint. To investigate the effect of UCG and CCS process parameters on the feasibility of the UCG-CCS process, we utilize a validated mathematical model, previously published by the same authors, that can predict the composition of the UCG product, temperature profile, and coal conversion rate for alternating injection of air and steam for unmineable deep thin coal layers. We use the results of the model to conduct an energy and exergy analysis of the UCG process. We study the effect of various process parameters on the efficiency of the UCG process, the zeroemission recovery factor of coal, and the total CO 2 emission of the process. Moreover, we compare the alternating injection of air/steam with the injection of an air and steam mixture.Exergy analysis shows that the alternating injection of air/steam describes a practical process for UCG at low pressure. However, injecting a mixture of steam and oxygen results in a practical recovery factor of coal higher than the alternating injection process. Additionally, we show that the zero-emission conversion of unmineable deep thin coal resources in a coupled UCG-CCS process, that is not practical with the current state of technology, can be realized by increasing the energy efficiency of the carbon dioxide capture process.

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Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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Energy and exergy analysis of alternating injection of oxygen and steam in the low emission underground gasification of deep thin coal

et al. 2017

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“…Site-specific coupled thermo-mechanical processes occurring in rocks adjacent to a deep UCG reactor are generally not well known in the field, because of the difficulty to quantify all occurring chemical reactions during the UCG process and their effects on UCG reactor size and shape [12]. Current knowledge on these processes is mainly based on laboratory experiments [13][14][15][16][17][18][19][20][21][22][23] and a few successful UCG field trails. Since the 1930s, more than 50 pilot-scale UCG operations have been carried out worldwide.…”

Section: Introductionmentioning

confidence: 99%

Fault Reactivation Can Generate Hydraulic Short Circuits in Underground Coal Gasification—New Insights from Regional-Scale Thermo-Mechanical 3D Modeling

et al. 2016

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Underground coal gasification (UCG) has the potential to increase worldwide coal reserves by utilization of coal deposits not mineable by conventional methods. This involves combusting coal in situ to produce a synthesis gas, applicable for electricity generation and chemical feedstock production. Three-dimensional (3D) thermo-mechanical models already significantly contribute to UCG design by process optimization and mitigation of the environmental footprint. We developed the first 3D UCG model based on real structural geological data to investigate the impacts of using isothermal and non-isothermal simulations, two different pillar widths and four varying regional stress regimes on the spatial changes in temperature and permeability, ground surface subsidence and fault reactivation. Our simulation results demonstrate that non-isothermal processes have to be considered in these assessments due to thermally-induced stresses. Furthermore, we demonstrate that permeability increase is limited to the close reactor vicinity, although the presence of previously undetected faults can introduce formation of hydraulic short circuits between single UCG channels over large distances. This requires particular consideration of potentially present sub-seismic faults in the exploration and site selection stages, since the required pillar widths may be easily underestimated in presence of faults with different orientations with respect to the regional stress regime.

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“…The current state of knowledge was summarized last year in a paper published in the journal Progress in Energy and Combustion Science (Bhutto et al 2013). Among 123 references to this paper only one provides brief information concerning practical application of ground penetrating radar for imaging and monitoring the UCG process (StaĔczyk et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Imaging the Underground Coal Gasification Zone with Microgravity Surveys

2015

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A b s t r a c tThe paper describes results of microgravity measurements made on the surface over an underground geo reactor where experimental coal gasification was performed in a shallow seam of coal. The aim of the research was to determine whether, and to what extent, the microgravity method can be used to detect and image a coal gasification zone, especially caverns where the coal was burnt out. In theory, the effects of coal gasification process create caverns and cracks, e.g., zones of altered bulk density. Before the measurements, theoretical density models of completely and partially gasified coal were analysed. Results of the calculations of gravity field response showed that in both cases on the surface over the gasification zone there should be local gravimetric anomalies. Over the geo reactor, two series of gravimetric measurements prior to and after gasification were conducted. Comparison of the results of two measurement series revealed the presence of gravimetric anomalies that could be related to the cavern formation process. Data from these measurements were used to verify theoretical models. After the experiment, a small cavern was detected at the depth of the coal seam by the test borehole drilled in one of the anomalous areas.

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Dynamic experimental simulation of hydrogen oriented underground gasification of lignite

Cited by 80 publications

References 10 publications

Energy and exergy analysis of alternating injection of oxygen and steam in the low emission underground gasification of deep thin coal

Energy and exergy analysis of alternating injection of oxygen and steam in the low emission underground gasification of deep thin coal

Fault Reactivation Can Generate Hydraulic Short Circuits in Underground Coal Gasification—New Insights from Regional-Scale Thermo-Mechanical 3D Modeling

Imaging the Underground Coal Gasification Zone with Microgravity Surveys

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