Heat integration and optimization of direct-fired supercritical CO2 power cycle coupled to coal gasification process

2018 ◽  
Vol 130 ◽  
pp. 1022-1032 ◽  
Author(s):  
Yongming Zhao ◽  
Bo Yu ◽  
Bo Wang ◽  
Shijie Zhang ◽  
Yunhan Xiao
Fuel ◽  
2019 ◽  
Vol 251 ◽  
pp. 636-643 ◽  
Author(s):  
Xijia Lu ◽  
Damian Beauchamp ◽  
Jason Laumb ◽  
Joshua Stanislowski ◽  
Michael Swanson ◽  
...  

Author(s):  
Marian Wiatowski ◽  
Roksana Muzyka ◽  
Krzysztof Kapusta ◽  
Maciej Chrubasik

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.


1982 ◽  
Vol 104 (1) ◽  
pp. 120-128 ◽  
Author(s):  
W. D. Clark ◽  
B. A. Folsom ◽  
W. R. Seeker ◽  
C. W. Courtney

The high efficiencies obtained in a combined gas-turbine/steam-turbine power cycle burning low Btu gas (LBG) make it a potentially attractive alternative to the high sulfur emitting direct coal-fired steam cycle. In the gasification process, much of the bound nitrogen in coal is converted to ammonia in the LBG. This ammonia is largely converted to nitrogen oxides (NOx) in conventional combustors. This paper examines the pressurized bench scale performance of reactors previously demonstrated to produce low NOx emissions in atmospheric laboratory scale experiments. LBG was synthesized in a catalytic reformer and fired in three reactors: a catalytic reactor, a diffusion flame, and a stirred reactor. Effects of scale, pressure, stoichiometry, residence time, and preheat were examined. Lowest NOx emissions were produced in a rich/lean series staged catalytic reactor.


2021 ◽  
Vol 198 ◽  
pp. 117515
Author(s):  
Chendi Yang ◽  
Yuanyuan Deng ◽  
Ning Zhang ◽  
Xiaopeng Zhang ◽  
Gaohong He ◽  
...  

2021 ◽  
Author(s):  
Congbin Jiang ◽  
Dan Wang ◽  
Cuiping Gong ◽  
Gang Zhang ◽  
Wen Gu ◽  
...  

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