Molten catalytic coal gasification with in situ carbon and sulphur capture

Siefert, Nicholas; Shekhawat, Dushyant; Litster, Shawn; Berry, David A.

doi:10.1039/c2ee21989a

Cited by 25 publications

(23 citation statements)

References 29 publications

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“…Different from in situ gasification where syngas is produced from controlled combustion of coal [8] or ex situ gasification which is generally performed at temperatures higher than 800 o C [9], biogasification can be conducted under mild environmental conditions. In addition, coal does not need to be cleaned before biogasification like those prepared for power generation [10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of methane production from bituminous coal through biogasification

2016

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To optimize methane production from bituminous coal through use of a well-studied microbial community derived from the same Illinois basin in USA, a total of 12 parameters were first evaluated by setting up 64 reactors following a 2-level factorial design. Among the 12 parameters, temperature, coal loading, particle size and ethanol were found to have statistically significant effects on methane content and yield from coal. Following screening, to identify optimal value for each significant factor, a Box-Behnken design necessitating 29 reactors was adopted. Optimal conditions provided by the Design of Expert software for the highest methane yield were: temperature, 32 o C; coal loading, 201.98 g/L; coal particle size, < 73.99 µm; and ethanol at 300 mM. Under these optimum conditions, the predicted methane yield and content was 2,957.4 ft 3 /ton (83.7 mm 3 /ton) and 74.2%, respectively. To confirm the predicted results, a verification experiment was conducted, where a methane yield of 2,900 ft 3 /ton (82.1 mm 3 /ton)

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Section: Introductionmentioning

confidence: 99%

Optimization of methane production from bituminous coal through biogasification

2016

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“…Among them, molten salt has been used recently due to its good catalytic activity, thermal conductivity and dissolution ability. Meanwhile, molten salt can in-situ capture of various pollutants like HCl and H 2 S [6]. More importantly, lignite containing alkali and alkaline earth metals can be dissolved into the salt during the molten salt pyrolysis, reducing damage to devices [7].…”

Section: Introductionmentioning

confidence: 99%

The effects of temperature and molten salt on solar pyrolysis of lignite

Zeng

Xie

et al. 2019

Energy

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Molten salt pyrolysis driven by concentrated solar radiation is well positioned to utilize solar energy and lignite effectively. This study focused on the effects of temperature (500, 600, 700 and 800 C) and molten carbonate salt (Li 2 CO 3-Na 2 CO 3-K 2 CO 3) on properties of char obtained from lignite pyrolysis, as well as gas and tar products for revealing their formation mechanism and transformation process. Molten salt pyrolysis of HulunBuir lignite produced more gas products and less char compared to conventional pyrolysis owing to the enhanced heat transfer and catalytic effect of molten salt. The char yield decreased from 58.4% to 43.4%, and the gas yield (especially CO 2 , H 2 and CO) increased from 28.3% to 46.1% at 800 C. CO 2 , CO and H 2 production increased about 60.43%, 103.42% and 65.2% at 800 C, respectively. Additionally, the presence of molten salt improved the tar quality with more hydrocarbon content (maximum increase of 5.8%) and less oxygenated compounds. The structure and reactivity relationship of char was characterized by XRD, BET, SEM, FTIR, Raman spectroscopy and TGA. Molten salt generated char had a higher reactivity due to the increase of disorder, surface area, microporosity (maximum of 71.74%) and active sites.

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“…[3][4][5] Recently, the staged utilization of lignite has attracted more and more attention due to its high utilization value and the significantly improved economic efficiency. [6][7][8][9] Due to its high reactivity, lignite can be decomposed at relatively lower temperatures than other coal. [10] The LT-LP process is regarded as a key step to upgrade lignite and produce high-valued tar.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

2019

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Lignite could be converted to high value‐added char and tar through a pyrolysis process. To improve the tar yield as well as the quality of tar/char during a low temperature (550 °C) lignite pyrolysis (LT‐LP) process, the influence of mixing inexpensive and accessible recycled carbocoal with three kinds of lignite was investigated in a fixed‐bed reactor. The LT‐LP processes with and without recycled carbocoal were investigated using a TGA and were compared in detail. The results indicated that the addition of the recycled carbocoal into the three lignite optimized the light tar yield from 4.63, 3.33, and 2.09 g/g to 10.50, 6.10, and 5.01 g/g, and improved the gasification reactivity of the chars up to 2.88, 2.58, and 2.88 h−1, respectively. To identify the role of recycled carbocoal during the LT‐LP process, the obtained products, such as tar and char, were characterized by chromatography, thermal gravimetric analyzer, chromatograph‐mass spectrometer, elemental analyzer, Fourier transform infrared spectroscopy, and scanning electron microscope. It was demonstrated that the existence of the recycled carbocoal could impede the self‐polymerization of small molecule hydrogen‐containing (SM‐HC) free radicals and cut down the reactions between SM‐HC and hydroxyl radicals at the weak‐bonds breaking zone (300–450 °C), thereby supplying sufficient free radical stabilizers for the tar intermediates at the molecular skeleton region (450–550 °C). The high‐valued tar and char were obtained. In summary, the employment of recycled carbocoal during the LT‐LP process could not only promote the economic benefit of LT‐LP products but also reduce the cost of lignite value‐added utilization.

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Molten catalytic coal gasification with in situ carbon and sulphur capture

Cited by 25 publications

References 29 publications

Optimization of methane production from bituminous coal through biogasification

Optimization of methane production from bituminous coal through biogasification

The effects of temperature and molten salt on solar pyrolysis of lignite

Enhancement of low‐temperature lignite pyrolysis by recycled carbocoal for high‐quality tar in fixed‐bed reactor

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