Rapid hydropyrolysis studies on coal and maceral concentrates

Strugnell, Brian; Patrick, John W.

doi:10.1016/0016-2361(95)00241-3

Cited by 39 publications

(27 citation statements)

References 19 publications

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“…During the pyrolysis of individual coal macerals, the highest yields of liquid products were reported for exinite and the lowest for vitrinite and inertinite [24]. At the temperature of 650ºC tar yields in the process of pyrolysis amounted to 22.4% for vitrinite and to 13.4% for inertinite.…”

Section: Coalmentioning

confidence: 93%

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The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

Kamińska-Pietrzak¹,

Howaniec²,

Smoliński³

2013

Ecological Chemistry and Engineering S

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Increasing energy demand, limited resources of fossil fuels and environmental aspects are the main rationales of the research efforts aiming at wider utilization of renewable resources and waste in energy generation systems. Gasification technologies are based on thermochemical processing of solid, liquid and gaseous fuels to gas of the composition dependent on kind of gasification agent and operating parameters used. The range of applications of the product gas includes basically chemical and petrochemical industries. Its utilization in power generation systems is also of industrial interest since the environmental impact of gasification technologies is lower and the process efficiency is higher than of coal-fired power plants and it enables to utilize wide range of fuels, including fossil fuels, biomass, industrial waste and various fuel blends. One of the most important operational issues related with thermochemical processing of biomass and waste is the formation of tars, which reduces the energy efficiency of the process and causes technical problems in a system operation. The amount and quality of tars depends on the chemical composition of a fuel, a gasification agent used and its ratio to fuel flow, process temperature and pressure as well as the construction of a gasifier. In the paper review of the research on the influence of operating parameters and kind of feedstock on tar formation and composition in the process of gasification and co-gasification is presented.

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Section: Coalmentioning

confidence: 93%

“…The detailed quantitative and qualitative characteristics of coal tars vary depending on the type, carbon structure, coal rank and its elemental composition [24][25][26]. During the pyrolysis of individual coal macerals, the highest yields of liquid products were reported for exinite and the lowest for vitrinite and inertinite [24].…”

Section: Coalmentioning

confidence: 99%

The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

Kamińska-Pietrzak¹,

Howaniec²,

Smoliński³

2013

Ecological Chemistry and Engineering S

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“…Comparisons between predicted and observed CO (dashed curve vs ▽), CO 2 (solid curve vs ▼), and H 2 O (dotted curve vs •) yields reported by Xu and Tomita 1 during atmospheric devolatilization of various coals heated at 3000 K/s to the indicated temperatures with a 4 s IRP in a CPP. The evaluations are represented in order of increasing coal rank from parts a through h. Strugnell and Patrick (SP); 7,8 and miscellaneous heated-grid (MH) tests for various pressures. 4,9−13 The database represents the entire coal rank spectrum, albeit with sparse medium-volatile (mv) bituminous and anthracite samples.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Predicting the Distributions of Oxygen Species from Primary Devolatilization of Coals

Pan

2019

Energy Fuels

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Starting from an extension to FLASHCHAIN, this study interprets the evolution of coal oxygen during primary devolatilization. CO 2 and H 2 O are primarily formed via bridge charring that accompanies depolymerization. At slower rates, CO plus additional CO 2 and H 2 O are expelled from side chains without disintegrating coal macromolecules. Coal-O shuttled by tar is tracked as in FLASHCHAIN. New stoichiometry specifies the partitioning of O among the precursors to CO, CO 2 , and H 2 O. CO precursors incorporate about one-third of coal-O, regardless of coal rank. In contrast, the split of coal-O between CO 2 and H 2 O precursors exhibits an erratic relation with coal quality, which has been resolved by a graphical method that connects precursor elimination during coalification to the displacements on the Van Krevelen diagram. With the roles for tar shuttling and macromolecular configuration accounted for, the model accurately interprets a database of 40 coals from all ranks with the new stoichiometry. The proportions of CO, CO 2 , and H 2 O are faithfully simulated across the entire rank spectrum, even when the observed CO 2 levels scatter by a factor of 6 among high-volatile bituminous coals very similar in carbon content. Predictions are accurate throughout devolatilization except for the latest stage of CO evolution, and within the discrepancies among independent measurements for pressures from vacuum to 7.0 MPa, pending new data to characterize the final stage of CO formation and evaluate the predicted heating rate effect.

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“…The hydro-pyrolysis was a considerably effective way to improve the light tar yield (Strugnell and Patrick, 1996;Ariunaa et al, 2007;Scaccia et al, 2012). The hydrogen atmosphere could provide hydrogen active radicals which were used to stabilize the volatile intermediates from the coal pyrolysis and enhance the light tar evolution (Liu, 2014).…”

Section: Introductionmentioning

confidence: 99%

Integrated Process of Coal Fast Pyrolysis in a Fluidized Bed Reactor With Reforming Reaction of Simulated Fuel Gas to Promote Light Tar Evolution

Luo

Yan

et al. 2021

Front. Energy Res.

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The evolution behavior of the light tar during coal fast pyrolysis under inert gas, simulated fuel gas (SFG) atmosphere, and catalytic reformation of simulated (CRS) fuel gas over Ni/Al2O3 was studied in this article. The light tar was recovered from the distillation of the crude tar at the temperature of 300°C and subsequently subjected to detection through the GC-MS analysis. It was found that both SFG and CRS over Ni/Al2O3 significantly enhanced the light tar yield, but a little effect was shown on the heavy tar yield. According to the molecular structure characteristics, the compounds in the light tar could be classified into several groups: aromatic components, phenol components, aliphatic components, heteroatom components, and O-containing components (phenol compounds excluded). It was demonstrated that the selectivity of each component in the light tar varied significantly with the pyrolysis atmosphere and temperature. The evolution of the aromatic components took the dominant role in the light tar produced at high temperature. The SFG and CRS contributed markedly to enhancing the evolution of the O-aromatic components in the light tar, whereas they suppressed the evolution of the O-aliphatic components and the phenol components in the light tar at high temperature.

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Rapid hydropyrolysis studies on coal and maceral concentrates

Cited by 39 publications

References 19 publications

The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

The Influence of Feedstock Type and Operating Parameters on Tar Formation in the Process of Gasification and Co-Gasification

Predicting the Distributions of Oxygen Species from Primary Devolatilization of Coals

Integrated Process of Coal Fast Pyrolysis in a Fluidized Bed Reactor With Reforming Reaction of Simulated Fuel Gas to Promote Light Tar Evolution

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