Comparative studies on steam gasification of ash-free coals and their original raw coals

Kong, Yongjin; Kim, Jaekwon; Chun, Dong Hyun; Lee, Sihyun; Rhim, Youngjoon; Lim, Jeong-Hoon; Choi, Hokyung; Kim, Sang-Do; Yoo, Jiho

doi:10.1016/j.ijhydene.2014.04.054

Cited by 33 publications

(20 citation statements)

References 35 publications

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“…Although the char prepared from each coal sample before the reaction were not analyzed, the order of the content of each element could be expected to not have changed. The rapid carbon conversion and higher rate constant for Adaro lignite could be explained with previous results in the literatures that showed a lower carbon contents and greater oxygen content results in more reactivity during the gasification reaction [20][21][22]. Furthermore, the interaction between K 2 CO 3 and the minerals in ash might be prevented due to the low ash content in Adaro lignite.…”

Section: Catalytic Activity With K 2 Co 3 and Ca(oh) 2 Catalystsupporting

confidence: 73%

The study on the effect of the substitution of K2CO3 with Ca(OH)2 on kinetics on CO2–lignite coal gasification

2015

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Three kinds of lignite were mixed with K 2 CO 3 and Ca(OH) 2 and were gasified with CO 2 to investigate the effect that the addition of Ca(OH) 2 had on the gasification kinetics. K 2 CO 3 and Ca(OH) 2 were impregnated and dried, their mixing ratio was varied, and the gasification experiments were conducted over a temperature range from 850 to 950°C at atmospheric pressure. The modified volumetric reaction model was applied as the gas-solid reaction model to analyze the carbon conversion results and thus obtain the kinetic parameters. The results indicate that the catalytic activity based on carbon conversion followed the order of K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% [ K 2 CO 3 8 wt% [ K 2 CO 3 3 wt% ? Ca(OH) 2 5 wt% [ K 2 CO 3 1 wt% ? Ca(OH) 2 7 wt%. The reaction rate was also influenced by the type of lignite, with a higher reactivity observed for Adaro lignite. The highest reaction rate constant was of 44.25 min -1 with Adaro lignite and K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% at 950°C. The lowest activation energy of 44.49 kJ/min was calculated for Mongolia lignite with K 2 CO 3 8 wt%. The reaction rate was enhanced by partly substituting K 2 CO 3 with Ca(OH) 2 , but further substitution resulted in a decrease in the reaction rate compared to that of K 2 CO 3 alone.

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Section: Catalytic Activity With K 2 Co 3 and Ca(oh) 2 Catalystsupporting

confidence: 73%

The study on the effect of the substitution of K2CO3 with Ca(OH)2 on kinetics on CO2–lignite coal gasification

2015

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“…The weight of AFC decreases at temperatures of more than 150 C, which indicates that AFC decomposes at very low temperatures compared with carbon. The FT-IR results revealed that the coal contains various hydrocarbon compounds [20]. In general, the organic compounds decomposed at very low temperatures of less than 500 C. The TGA of AFC shows the typical behaviour of organic compounds when it starts to decompose at 150 C, and then this behaviour continues up to 600 C. Considering that the carbon and carbonate reaction occurs at around 700 C, the AFC has very different chemical characteristics and a very low gasification temperature compared to the biomass carbon.…”

Section: Resultsmentioning

confidence: 99%

“…The high performance of Cell IV indicates that the AFC does not require carbonates as the gasification catalysts for carbon. Indeed, the AFC is basically different from carbon because the AFC contains various hydrocarbon compounds [20].…”

Section: Resultsmentioning

confidence: 99%

Oxidation of ash-free coal in a direct carbon fuel cell

Lee

Kim

2015

International Journal of Hydrogen Energy

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“…Recent studies were recently published [8,59]. In the review by Li et al, a discussion of the gasification reaction mechanism is included.…”

Section: Blast Furnaces Combined Cycle Plants Fuel Cellsmentioning

confidence: 99%

“…In the review by Li et al, a discussion of the gasification reaction mechanism is included. With the expansion of the combined cycle power stations, the research in coke gasification by H 2 O increased, with the aim of optimizing the process [59]. The mechanism of the catalytic process is frequently discussed, but always with great uncertainty.…”

Section: Blast Furnaces Combined Cycle Plants Fuel Cellsmentioning

confidence: 99%