Exergy optimisation of reverse combustion linking in underground coal gasification

Blinderman, Michael S.; Saulov, D. N.; Klimenko, A. Y.

doi:10.1179/174602208x269427

Cited by 15 publications

(14 citation statements)

References 7 publications

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“…At the end of the treatment of this reaction zone, the reaction cavity-zone is automatically formed in the same way, on the next third, fourth, etc., fig. 4, [7]. In order for the gasification process to be performed more efficiently by the CRIP method, the mentioned half round layer in the injection borehole help to avoid possible problematic geological structures of the coal bed, as well as coal roof and coal floor.…”

Section: Technological Process Of Ucgmentioning

confidence: 99%

“…In order to improve the quality of the gas obtained, the concentrations of H 2 , CO and CH 4 are of prime importance, since CO 2 is an inert gas without calorific value, tab. 1, [7]. The concentrations of various gases relative to the total amount of gas mixture dictate the constitution of the characteristic zones in the total reaction zone, fig.…”

Section: Technological Process Of Ucgmentioning

confidence: 99%

“…The concentrations of various gases relative to the total amount of gas mixture dictate the constitution of the characteristic zones in the total reaction zone, fig. 5, [7].…”

Section: Technological Process Of Ucgmentioning

confidence: 99%

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Valorization of non-balanced coal reserves in Serbia for underground coal gasification

Petrović¹,

Kricak

Negovanovic

et al. 2019

THERM SCI

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In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for Serbia. The goal is to burn less coal, while simultaneously utilizing more gas from the onsite underground coal gasification, or by gasification in various types of gas generators mounted on the surface. In both cases, from the obtained gas, CO 2 , NO x , and other harmful gases are extracted in scrubbers. This means that further gas combustion byproducts do not pollute the atmosphere in comparison with traditional coal combustion. In addition, complete underground coal gasification power requirements could be offset by the onsite solar photovoltaic power plant, which furthermore enhances environmental concerns of the overall coal utilization.

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Section: Technological Process Of Ucgmentioning

confidence: 99%

Section: Technological Process Of Ucgmentioning

confidence: 99%

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Valorization of non-balanced coal reserves in Serbia for underground coal gasification

Petrović¹,

Kricak

Negovanovic

et al. 2019

THERM SCI

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“…Methods such as hydraulic fracturing, electro-linkage, explosives, and in seam linkages can be incorporated for this purpose. A detailed description of the methods is given in Blinderman et al (2008) andFriedmann et al, (2009). Air and/or oxygen is injected through the injection well to start the ignition of coal in the third phase.…”

Section: Introductionmentioning

confidence: 99%

A coupled thermal-mechanical numerical model of underground coal gasification (UCG) including spontaneous coal combustion and its effects

Ekneligoda

Marshall

2018

International Journal of Coal Geology

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“…They showed that the overall efficiency of the electricity production from the UCG-IGCC (Integrated Gasification Combined Cycle) can reach 43%, which is comparable to a natural gas combined cycle (NGCC). Blinderman et al [13] used the concept of exergy to maximize the efficiency of the reverse combustion linking (RCL) process; in the RCL process, high pressure air is injected into a low permeable coal layer and the combustion starts at the production well, propagating backwards to the injection well creating a high permeable link between the injection and production wells. Although here we look into a similar backward gasification process, we consider a process where a link is already established between the injection and the production wells.…”

Section: Introductionmentioning

confidence: 99%

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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Exergy optimisation of reverse combustion linking in underground coal gasification

Cited by 15 publications

References 7 publications

Valorization of non-balanced coal reserves in Serbia for underground coal gasification

Valorization of non-balanced coal reserves in Serbia for underground coal gasification

A coupled thermal-mechanical numerical model of underground coal gasification (UCG) including spontaneous coal combustion and its effects

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

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