Interactions between organic nitrogen and inorganic matter in the pyrolysis zone of underground coal gasification: Insights from controlled pyrolysis experiments

Ding, Kangle; Zhang, Changmin

doi:10.1016/j.energy.2017.06.130

Cited by 10 publications

(10 citation statements)

References 68 publications

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“…The reactor's headspace gas products were retrieved via the sampling valve and analyzed by an Agilent 6890 gas chromatograph. 51,100 The reactor was then extracted with dichloromethane (DCM) at 90 °C for 1 h and then the DCM extract was characterized by Agilent 7890A gas chromatography-Agilent 5975C mass spectrometry (GC-MS). 51,100 The quartz tube was first dried in an oven at 120 °C for 2 h to eliminate the remaining DCM and moisture in the tube and subsequently calcined in a muffle furnace at 600 °C for least 2 h, removing the unreacted coronene and newly formed coke.…”

Section: Methodsmentioning

confidence: 99%

“…The exterior wall of the autoclave was flushed with tap water to allow it to cool to ambient temperature. The reactor’s headspace gas products were retrieved via the sampling valve and analyzed by an Agilent 6890 gas chromatograph. , The reactor was then extracted with dichloromethane (DCM) at 90 °C for 1 h and then the DCM extract was characterized by Agilent 7890A gas chromatography-Agilent 5975C mass spectrometry (GC-MS). , The quartz tube was first dried in an oven at 120 °C for 2 h to eliminate the remaining DCM and moisture in the tube and subsequently calcined in a muffle furnace at 600 °C for least 2 h, removing the unreacted coronene and newly formed coke. The calcined solid products were analyzed in a PANalytical X’Pert PRO X-ray diffractometer (PANalytical Co., Almelo, Netherlands) to determine their composition .…”

Section: Methodsmentioning

confidence: 99%

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Thermochemical Sulfate Reduction by Pyrobitumen: Review and Experiments

Liu

Zhang

Ding

et al. 2022

ACS Earth Space Chem.

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It has remained controversial throughout the last three decades whether highly mature solid bitumen derived from petroleum degradation can engage in thermochemical sulfate reduction (TSR)an organic–inorganic interaction that occurs in sedimentary basins. To investigate the kinetic characteristics of thermal sulfate reduction by thermogenic pyrobitumen, hydropyrolysis experiments with magnesium sulfate (MgSO4) and a model compound, coronene (C24H12), were performed at 300–500 °C under controlled laboratory conditions. The experimental results indicate that detectable amounts of H2S from the designed simulation system were formed at a threshold temperature of 400 °C. Thermodynamically, coronene-initiated sulfate reduction is an exothermic process at 100–220 °C with the reaction heat of 221.0–248.3 kJ/mol hydrocarbon. TSR of coronene is characterized by a first-order reaction with an apparent activation energy of 193.0 kJ/mol. Interactions between C24H12 and MgSO4 are kinetically categorized as a slow TSR system because the high stability of coronene restricts the formation rate of H2S gas relative to rapid TSR systems containing C2+ hydrocarbons. When extrapolated to the temperature range of typical oil and gas reservoirs (100–200 °C), the reaction rate of TSR by coronene is slightly higher than that of TSR involving methane, gypsum, and MgCl2 solutions [Hydrothermal experiments involving methane and sulfate: insights into carbon isotope fractionation of methane during thermochemical sulfate reductionHeK.ZhangS. C.WangX. M. He, K. Zhang, S. C. Wang, X. M. Org. Geochem.2020149104107]. Depletion of some organic carbons by TSR may contribute to the increase of S/C ratios in the molecular structure of thermogenic pyrobitumen. In deep carbonate reservoirs of methane-dominated TSR, hydrothermal reduction of sulfates by thermogenic pyrobitumen most likely occurs as a less well-recognized geochemical process.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Thermochemical Sulfate Reduction by Pyrobitumen: Review and Experiments

Liu

Zhang

Ding

et al. 2022

ACS Earth Space Chem.

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“…It is expedient to analyze the formation of fuel and chemical complexes with different output capacities in the context of other Ukrainian lignite deposits including the possibilities for underground gasification of offgrade coal seams [22,23] and synthetic gas generations for the needs of chemical industry [24,25]. 1 -Державний вищий навчальний заклад "Національний гірничий університет", м. Дніпро, Україна, e-mail: shustov.o.o@nmu.one 2 -ТОВ Науково-впроваджувальне підприємство "Інтехпроект", м. Дніпро, Україна, e-mail: intehpro@gmail.com…”

Section: Fig 4 a Graph Of Fmac Stress Analysis To Produce Ammonia Ounclassified

Substantiation of the ways to use lignite concerning the integrated development of lignite deposits of Ukraine

Шустов¹,

Bielov²,

Perkova³

et al. 2018

SBNMU

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Purpose. To substantiate the ways of the integrated lignite use as well as its derivatives by power, metallurgical, chemical, and construction industries of Ukraine to support the competitiveness of the country market. methodology. The following research techniques were applied to solve the problems: mathematical modeling method was used to determine volumes of lignite extraction and to identify the intensity of inflows to opening mine workings while forming the operating area of an open pit; the method of graphic-analytical and mining and geometrical analysis was used to optimize parameters of open-pit mining operations in the process of their deepening; the method of techno-economic analysis of variants was used to select efficient schemes to extract productive lignite levels under complicated mining and geological conditions; and the method of economic modeling was used to determine investment attractiveness of lignite derivatives. findings. Current state of mining enterprises extracting lignite has been analyzed to determine economically viable techniques for its processing. Investment attractiveness has been evaluated concerning ammonia production with the use of a technique of financial and mathematical expenses. Recommendations have been provided as for the future research on lignite mining and processing for the construction of the integral processing enterprise. Originality. Both attractiveness and profitability of ammonia production on the basis of technique of financial and mathematical expenses have been evaluated since ammonia is the most efficient lignite derivative. The studies have shown that IRR of lignite-based ammonia production is over 10 %. Estimation of technical and economic parameters of ammonia production as the basic product makes it possible to recommend lignite and the associated reserves of coal clay as the raw material to generate synthesis gas instead of natural gas used by chemical industry of Ukraine. Calculations on the adopted scheme of a deposit mining have shown that it is possible to produce the cheapest crude hydrocarbons in terms of equivalent to a ton of equivalent fuel in the Ukrainian energy market. The obtained cost values of the equivalent fuel ton are more than 5 times lower compared with natural gas. Practical value. The research results concerning the substantiation of a rational scheme to open and develop productive levels and economic and mathematical modeling of ammonia production make it possible to recommend lignite as crude hydrocarbons for chemical industry which will favor the revival of lignite industry in Ukraine. Construction of a processing complex for ammonia production on the basis of Novo-Dmytrivka deposit with 2.7 to 3.8 million tons of annual output will help decrease the country's dependence on import natural gas; increase pumping up the budgets and funds of all levels by the projected amount of no less than UAH 5 billion a year; provide the local communities with new jobs; attract almost USD 5-6 billion of investment; and develop marginal product ...

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“…4 These investigations of thermal conductivity for coals were mostly reported around in the year 2000, whereas further studies are demanded currently due to the new thermal applications in coalbed, such as thermally enhanced gas recovery, 5,6 coalfield fire estimation, 7,8 coal mine geothermal utilization, 9,10 and underground coal gasification. 11,12 For coals, the bedding planes are visible and delimitated by obvious lithotypes. As references, the investigations on thermal conductivity of laminated metamorphic rocks and clay stones are focused on their anisotropy that affects the thermal regimes of a sedimentary basin.…”

Section: Introductionmentioning

confidence: 99%

“…The moisture and minerals contribute to the thermal conductivity of a coal except for anthracite . These investigations of thermal conductivity for coals were mostly reported around in the year 2000, whereas further studies are demanded currently due to the new thermal applications in coalbed, such as thermally enhanced gas recovery, , coalfield fire estimation, , coal mine geothermal utilization, , and underground coal gasification. , …”

Section: Introductionmentioning

confidence: 99%

Relationship between Thermal Conductivity and Chemical Structures of Chinese Coals

2020

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Three different ranks of Chinese coals were investigated on the thermal conductivity and corresponding molecular structure by thermal analyzer, 13 C NMR, and HRTEM techniques. The thermal conductivity of coals measured in room temperature first shows a decrease, then a slight increase, and finally a sharp increase with increasing coalification. Ranging from 30 to 150 °C, increasing the temperature slightly improves the thermal conductivity of coals with varying degrees. Water with a higher thermal conductivity than air contributes to the thermal conductivity of porous coal samples. The value of thermal conductivity is higher along coal bedding planes than when perpendicular to beddings, which indicates the anisotropy of coal thermal conductivity. The anisotropy degree increases with the rank of coals and is affected by clay minerals when coals adsorb water. Molecular structure analysis shows that polycondensed aromatic ring related to lattice vibration contributes to the increase of thermal conductivity. The aliphatic bridges among aromatic clusters ensure the continuity of atom vibrations and contribute to energy transport, but the free-ended side chains have the opposite effect. The relative ordered distributions of lattice fringes of anthracite, which were higher than those of bituminous coal, enhance the anisotropy of thermal conductivity.

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Interactions between organic nitrogen and inorganic matter in the pyrolysis zone of underground coal gasification: Insights from controlled pyrolysis experiments

Cited by 10 publications

References 68 publications

Thermochemical Sulfate Reduction by Pyrobitumen: Review and Experiments

Thermochemical Sulfate Reduction by Pyrobitumen: Review and Experiments

Substantiation of the ways to use lignite concerning the integrated development of lignite deposits of Ukraine

Relationship between Thermal Conductivity and Chemical Structures of Chinese Coals

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