Historical development of underground coal gasification

Olness, D.U.; Gregg, D.W.

doi:10.2172/7284583

Cited by 15 publications

(25 citation statements)

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“…A successful UCG experiment needs to produce gas of a combustible quality from unmined coal in a controlled manner that allows the experiment to be reproduced. A detailed description of the first experiments in UCG is given in the excellent historic review of UCG by Olness and Gregg [7], although in several important instances our account and interpretation of the events differs from this work.…”

Section: First Soviet Ucg Trialsmentioning

confidence: 92%

“…Figure 2. Underground gasification schemes that were (a) mentioned [7,19] and (b) used by Ramsay. In 1912, Ramsay planned his retirement from being a Chair at the University College and spending more time on his other interests.…”

Section: Sir William Ramsay and Ucgmentioning

confidence: 99%

“…This is not the first article on early history of UCG. Reviews of early experiments have been given by many authors [6][7][8]. Among these publications, one review -by Olness and Gregg [7] -stands alone as by far the most comprehensive and detailed account of the first experiments in UCG.…”

Section: Introductionmentioning

confidence: 99%

“…Reviews of early experiments have been given by many authors [6][7][8]. Among these publications, one review -by Olness and Gregg [7] -stands alone as by far the most comprehensive and detailed account of the first experiments in UCG. We, of course, do not intend to duplicate this work and instead focus on important events or details that are not covered in the review [7].…”

Section: Introductionmentioning

confidence: 99%

“…Among these publications, one review -by Olness and Gregg [7] -stands alone as by far the most comprehensive and detailed account of the first experiments in UCG. We, of course, do not intend to duplicate this work and instead focus on important events or details that are not covered in the review [7]. In this work, we also are interested in the technological motivations that drove the decisions made in the first experiments in UCG.…”

Section: Introductionmentioning

confidence: 99%

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Early Ideas in Underground Coal Gasification and Their Evolution

Klimenko

2009

Energies

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This article follows the development of early UCG (underground coal gasification) ideas. Historical facts are discussed mainly from the technological perspective and early experiments in UCG are analyzed. Our search for the first successful UCG experiment brings to light a new finding, which was commonly overlooked in previous reviews. We also outline the key role that engineer and inventor A. G. Betts played in introducing technologies utilizing unmined coal; his original ideas are visible in the first successful UCG experiments and in modern UCG technology.

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Section: First Soviet Ucg Trialsmentioning

confidence: 92%

Section: Sir William Ramsay and Ucgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Ideas in Underground Coal Gasification and Their Evolution

Klimenko

2009

Energies

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Pure oxygen condition forced oxidation ignition process of underground coal gasification

Liang

Zhao

et al. 2023

Asia-Pacific J Chem Eng

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Underground coal gasification without shaft is a technology that uses directional drilling technology to gasify deeply buried coal. The technology first needs to ignite the coal seam during drilling, but as the depth of the coal seam (drilling) increases, it is very difficult to ignite the underground coal seam. In order to ignite the underground coal seam more safely and effectively, the forced oxidation ignition technology has been developed; that is, the coal seam is heated by hot oxygen, and the coal seam is rapidly oxidized and released to ignite the coal seam. Due to the complex confidential environment, it is challenging to ignite underground coal seams. To ignite the underground coal seams more safely and effectively, this paper used a self-made reactor to simulate the forced convection heating of the bituminous coal under different oxygen flow rates with hot oxygen and used a Fourier transform infrared spectrometer flue gas analyzer to detect the outlet gas, used ATR-FTIR spectrometer to analyze the solid residues in different areas, and recorded the time and maximum temperature of coal ignition under other processes. The results showed that low-flow high-temperature oxygen could quickly burn coal seams.When the oxygen flow rate was 2.5 m 3 /h, and the coal seam was ignited when heated to 130 C for 170 min. Through GC-MS analysis of nine flammable components in the tar components under different processes, the content of shortchain aliphatic hydrocarbons in the tar decreases, and the content of benzene series tends to increase. Through ATR-FTIR analysis, the solid sample near the gas injection port contained fewer oxygen functional groups; the middle of the furnace body included the most oxygen functional groups; near the gas outlet contained more oxygen functional groups than the raw coal. CO 2 would rise to 3% when coal was about to ignite.

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Movable injection point–based syngas production in the context of underground coal gasification

Kashyap

Vairakannu

2020

Int J Energy Res

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Summary Underground coal gasification (UCG) has been proven as a viable technology for the generation of high calorific value syngas using deep mine coal seams. The use of multiple injection points/movable injection point method could be an alternate technique for efficient gasification of high ash Indian coals. In this context, the present study is focused on evaluating the heating value of syngas using a variety of gasifying agents such as pure O2, air, humidified O2, and CO2‐O2 dual‐stage gasification under movable injection method for high ash coals. It is found that the use of movable injection point method had significantly increased the heating value of the product gas, compared with the fixed point injection method. For high and low ash coal under pure O2 gasification, the calorific value of syngas obtained using movable injection point is 123.2 and 153.9 kJ/mol, which are 33.5% and 24.3% higher than the syngas calorific value obtained using fixed injection point, respectively. Further, the air as a gasification agent for high ash coals had increased the gross calorific value of the syngas by 24%, using this technology. The results of high ash coal gasification using humidified oxygen at optimum conditions (0.027‐kg moisture/kg dry O2) and CO2‐O2 gas had enhanced the syngas calorific value by 12.6% and 5%, respectively. Humidified O2 and CO2‐O2 gasifying agents produced a high‐quality syngas with the calorific value of 190 kJ/mol, among the gasifying agents used. The experimental results had shown that the movable injection point method is found to be a better alternative for the generation of calorific value‐enriched syngas using high ash‐based Indian coals.

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Historical development of underground coal gasification

Cited by 15 publications

References 0 publications

Early Ideas in Underground Coal Gasification and Their Evolution

Early Ideas in Underground Coal Gasification and Their Evolution

Pure oxygen condition forced oxidation ignition process of underground coal gasification

Movable injection point–based syngas production in the context of underground coal gasification

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