scholarly journals Retraction: Nakaten N. and Kempka T. Techno-Economic Comparison of Onshore and Offshore Underground Coal Gasification End-Product Competitiveness. Energies 2017, 10, 1643

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3253
Author(s):  
Natalie Nakaten ◽  
Thomas Kempka
Keyword(s):  
Energy Balance ◽  
Simulation Model ◽  
Coal Gasification ◽  
Economic Assessment ◽  
Underground Coal Gasification ◽  
Programming Error ◽  
Economic Comparison

A programming error in our simulation model resulted in the overestimation of three input mass streams, inducing follow-up errors in the mass and energy balance calculations as well as the economic assessment, so that the results presented in the manuscript [...]

scholarly journals Underground coal gasification - the Velenje Coal Mine energy and economic calculations

2017 ◽  
Vol 23 (2) ◽  
pp. 269-277 ◽  
Author(s):  
Damjan Konovsek ◽  
Zdravko Praunseis ◽  
Jurij Avsec ◽  
Gorazd Bercic ◽  
Andrej Pohar ◽  
...  
Keyword(s):  
Coal Mine ◽  
Coal Gasification ◽  
Economic Assessment ◽  
Operating Mode ◽  
Primary Energy ◽  
Underground Coal Gasification ◽  
Gasification Process ◽  
Coal Deposits ◽  
Demonstration Experiment ◽  
Past Experiences

Underground coal gasification (UCG) is a viable possibility for the exploitation of vast coal deposits that are unreachable by conventional mining and can meet the energy, economic and environmental demands of the 21st century. Due to the complexity of the process, and the site-specific coal and seam properties, it is important to acknowledge all the available data and past experiences, in order to conduct a successful UCG operation. Slovenia has huge unmined reserves of coal, and therefore offers the possibility of an alternative use of this domestic primary energy source. According to the available underground coal gasification technology, the energy and economic assessment for the exploitation of coal to generate electricity and heat was made. A new procedure for the estimation of the energy efficiency of the coal gasification process, which is also used to compare the energy analyses for different examples of coal exploitation, was proposed, as well as the technological schemes and plant operating mode in Velenje, and the use of produced synthetic coal gas (syngas). The proposed location for the pilot demonstration experiment in Velenje Coal Mine was reviewed and the viability of the underground coal gasification project in Velenje was determined.

scholarly journals Contribution to creating a mathematical model of underground coal gasification process

2019 ◽  
Vol 23 (5 Part B) ◽  
pp. 3275-3282
Author(s):  
David Petrovic ◽  
Dusko Djukanovic ◽  
Dragana Petrovic ◽  
Igor Svrkota
Keyword(s):  
Mathematical Model ◽  
Water Vapor ◽  
Chemical Composition ◽  
Coal Gasification ◽  
Energy Content ◽  
Economic Assessment ◽  
Pure Oxygen ◽  
Underground Coal Gasification ◽  
Gasification Process ◽  
Underground Gasification

Underground coal gasification, as an auto thermal process, includes processes of degasification, pyrolysis, and the gasification itself. These processes occur as a result of a high temperature and the management of coal combustion during addition of gasification agent. Air, water vapor mixed with air, air or water vapor enriched with oxygen, or pure oxygen, may be used as gasification agents. Resulting gas that is extracted in this process may vary in chemical composition, so it is necessary to adjust it. That is the reason why it is necessary to develop a mathematical model of the underground gasification process prior to any operations in coal deposit, in order to obtain as much accurate prediction of the process as possible. Numerical calculation provides prediction of gas mixture?s chemical composition, which enables calculation of gas components? energy contents and total energy content of the gas in predicted underground coal gasification process. It is one of the main criteria in the economic assessment of underground coal gasification process. This paper, based on available data on researches in this area, provides a contribution to creation of mathematical model of underground coal gasification.

Cold Flow Simulation in Underground Coal Gasification (UCG) Cavities

2014 ◽  
Vol 1 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Dipankar Chatterjee ◽  
◽  
Satish Gupta ◽  
Chebolu Aravind ◽  
Rakesh Roshan
Keyword(s):  
Coal Gasification ◽  
Flow Simulation ◽  
Underground Coal Gasification ◽  
Cold Flow

scholarly journals Changes in properties of tar obtained during underground coal gasification process

2021 ◽  
Author(s):  
Marian Wiatowski ◽  
Roksana Muzyka ◽  
Krzysztof Kapusta ◽  
Maciej Chrubasik
Keyword(s):  
Coal Gasification ◽  
Coal Tar ◽  
Liquid Product ◽  
Coke Oven ◽  
Underground Coal Gasification ◽  
Gasification Process ◽  
Dominant Component ◽  
Process Gas ◽  
High Volatility ◽  
Product Separator

AbstractIn this study, the composition of tars collected during a six-day underground coal gasification (UCG) test at the experimental mine ‘Barbara’ in Poland in 2013 was examined. During the test, tar samples were taken every day from the liquid product separator and analysed by the methods used for testing properties of typical coke oven (coal) tar. The obtained results were compared with each other and with the data for coal tar. As gasification progressed, a decreasing trend in the water content and an increasing trend in the ash content were observed. The tars tested were characterized by large changes in the residue after coking and content of parts insoluble in toluene and by smaller fluctuations in the content of parts insoluble in quinoline. All tested samples were characterized by very high distillation losses, while for samples starting from the third day of gasification, a clear decrease in losses was visible. A chromatographic analysis showed that there were no major differences in composition between the tested tars and that none of the tar had a dominant component such as naphthalene in coal tar. The content of polycyclic aromatic hydrocarbons (PAHs) in UCG tars is several times lower than that in coal tar. No light monoaromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes—BTEX) were found in the analysed tars, which results from the fact that these compounds, due to their high volatility, did not separate from the process gas in the liquid product separator.

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