Evaluation of synthetic gas harmful effects created at the underground coal gasification process realized in laboratory conditions

Durdán, Milan; Laciak, Marek; Kačur, Ján; Flegner, Patrik; Kostúr, Karol

doi:10.1016/j.measurement.2019.106866

Cited by 6 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, since the raw coal undergoes complex physical and chemical changes upon underground gasification, the macromolecules in the coal easily crack to form tiny molecular benzene rings, aliphatic chain hydrocarbons, aromatic hydrocarbons, tar, and other harmful pollutants. This complicates the composition of the resulting gas. − …”

Section: Resultsmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

View full text Add to dashboard Cite

The potential pollution risk of underground coal gasification (UCG) has become a key factor restricting the development of UCG industrialization. Therefore, studying the migration and diffusion behavior of harmful pollutants is of great significance for preventing UCG pollution. In this paper, a large-scale three-dimensional similar simulation experimental device for UCG is used to simulate the gasification of Tianjin fat coal under actual working conditions. The rock layer around the simulated coal seam was sampled after the gasification was completed, the contaminants in the samples were examined by XRD, and the changes in the relative content of the contaminants at different sampling points were studied by FTIR. The results showed that benzene, phenols, aldehydes, aromatic hydrocarbons, and aromatic heterocyclic compounds remained after the gasification of No. 7 sampling point in Qianjiang, Tianjin, and that the main pollutants were aromatic hydrocarbons. The migration and enrichment of phenol and aldehyde pollutants were about the same on the east and west sides of the gasification center, while benzene pollutants were more easily migrated and enriched than aromatic heterocyclic compounds. The migration distance of phenolic pollutants on the south side of the gasification area is smaller than that of other pollutants and their maximum vertical distance from the gasification reaction area to the south is about 0.7 m. The results can provide a scientific basis for pollutant risk identification and prevention and control in the later UCG field test.

show abstract

Section: Resultsmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the figure, the critical or limit value of CO is represented by a dashed line. An assessment of the harmful effects of syngas from UCG was also carried out in [138]. The analysis and experiments showed that the coal seam's permeability affects the georeactor's thermal performance.…”

Section: Prediction Of Poisoning and Explosion In The Ucgmentioning

confidence: 99%

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Kačur,

Laciak,

Durdán

et al. 2023

Energies

Self Cite

View full text Add to dashboard Cite

The underground coal gasification (UCG) technology converts coal into product gas and provides the option of environmentally and economically attractive coal mining. Obtained syngas can be used for heating, electricity, or chemical production. Numerous laboratory coal gasification trials have been performed in the academic and industrial fields. Lab-scale tests can provide insight into the processes involved with UCG. Many tests with UCG have been performed on ex situ reactors, where different UCG techniques, the effect of gasification agents, their flow rates, pressures, and various control mechanisms to improve gasification efficiency and syngas production have been investigated. This paper provides an overview of recent research on UCG performed on a lab scale. The study focuses on UCG control variables and their optimization, the effect of gasification agents and operating pressure, and it discusses results from the gasification of various lignites and hard coals, the possibilities of steam gasification, hydrogen, and methane-oriented coal gasification, approaches in temperature modeling, changes in coal properties during gasification, and environmental risks of UCG. The review focuses on laboratory tests of UCG on ex situ reactors, results, and the possibility of knowledge transfer to in situ operation.

show abstract

“…It is still the main energy source that has been used to support the social and economic development of our country for a long time [1,2]. However, in the process of coal mining, spontaneous coal combustion, gas explosions, and coal mine dust-induced accidents often occur [3][4][5][6][7][8][9][10][11][12][13], which seriously affect the underground green environment, bring serious and fatal damage to the miners, and cause huge economic losses. In China, the most widely used technology to curb disasters from the source is coal seam water injection [14][15][16], which can effectively prevent the occurrence of coal mine accidents.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Application of Water Injection Process in Gas-Bearing Coal Seam

Lin,

Liu,

Geng

et al. 2023

Processes

View full text Add to dashboard Cite

Coal seam pre-drainage technology is widely used to prevent and control gas in China’s high-gas coal seams, and upward drilling is a safe and reliable technology. Using the Luling Coal Mine as the study location, according to the actual situation of the site, a layer-through drilling process was proposed. Relying on a cross-layer extraction borehole, coal seam water injection efficiency extraction and high-efficiency water injection dust prevention can be performed in the later stage of borehole extraction, enabling one-hole multi-purpose and “gas-powder” integrated prevention and control. In order to study the “stress-seepage” coupling characteristics of the coal around the borehole, a numerical simulation of the coal seam water injection process was conducted. Based on the simulation results, a field test of water injection in coal seam upward drilling was performed. The field monitoring data show that the water injection and water content of the coal seam were increased by about 3.07 m3 and 0.69%, respectively, compared with the traditional water injection process. The water injection effect is remarkable, which is of great significance to ensure the safe and efficient production of the mine.

show abstract

Evaluation of synthetic gas harmful effects created at the underground coal gasification process realized in laboratory conditions

Cited by 6 publications

References 23 publications

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research

Optimization and Application of Water Injection Process in Gas-Bearing Coal Seam

Contact Info

Product

Resources

About