Modeling char combustion: The influence of parent coal petrography and pyrolysis pressure on the structure and intrinsic reactivity of its char

Benfell, Kathy E.; Liu, Gui-Su; Roberts, Daniel G.; Harris, David; Lucas, John; Bailey, Judy G.; Wall, Terry

doi:10.1016/s0082-0784(00)80633-5

Cited by 83 publications

(82 citation statements)

References 16 publications

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“…These parameters have also been reported to influence the swelling behavior and fluidity of a fuel [3,[7][8][9][10] as well as reactivity of the resulting chars [4,9,[11][12][13]. In some studies, the properties of the porous structure of chars, reflected in the total pore volume, pore area, and pore size distribution, were studied, since the shape and interconnections between pores significantly influence the physical properties of a material, such as its density, mechanical strength, and sorption capacity as well as thermal conductivity and mass flow in thermochemical processing [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of pyrolysis temperature and heating rate [5,[16][17][18][19][20][21][22], fuel particle size [17,22,23], as well as physical or chemical pre-treatment of carbonaceous materials [24][25][26][27] on the porous structure of chars has also been reported. In a limited number of studies, the effects of pressure on char development were considered [3,8,9,12,[28][29][30]. These were reported to be complex, and also related to other parameters, i.e., coal rank, process temperature, heating rate, and residence time.…”

Section: Introductionmentioning

confidence: 99%

“…These were reported to be complex, and also related to other parameters, i.e., coal rank, process temperature, heating rate, and residence time. The rise in pyrolysis pressure was reported to hinder [9,31] or enhance [5,12] the development of the surface area of chars. A trend of increase in the specific surface area of chars with pressure, followed by a decrease with further pressure rise was also observed [5,28,29].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Porous Structure Parameters of Biomass Chars Versus Bituminous Coal and Lignite Carbonized at High Pressure and Temperature—A Chemometric Study

Smoliński

Howaniec

2017

Energies

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Abstract:The characteristics of the porous structure of carbonized materials affect their physical properties, such as density or strength, their sorption capacity, and their reactivity in thermochemical processing, determining both their applicability as fuels or sorbents and their efficiency in various processes. The porous structure of chars is shaped by the combined effects of physical and chemical properties of a carbonaceous material and the operating parameters applied in the carbonization process. In the study presented, the experimental dataset covering parameters of various fuels, ranging from biomass through lignite to bituminous coal, and chars produced at 1273 K and under the pressure of 1, 2, 3, and 4 MPa was analyzed with the application of the advanced method of data exploration. The principal component analysis showed that the sample of the highest coal rank was characterized by lower values of parameters reflecting the development of the porous structure of chars. A negative correlation was also observed between the carbon content in a fuel and the evolution of the porous structure of chars at high pressure. The highest total pore volume of chars produced under 1 and 3 MPa and the highest micropore surface area under 3 MPa were reported for a carbonized fuel sample of the highest moisture content.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Porous Structure Parameters of Biomass Chars Versus Bituminous Coal and Lignite Carbonized at High Pressure and Temperature—A Chemometric Study

Smoliński

Howaniec

2017

Energies

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“…Coal, as it pyrolyzes, often goes through a semi-fluid state, and large bubbles can form in the particle before it completely solidifies. Hodge et al classified their char particles using a system proposed earlier by Benfell et al, 11 which is illustrated in Figure 3.7. Group I particles are solid bubbles, in which a large, central void is encased by a porous carbon sphere.…”

Section: Thiele Analysismentioning

confidence: 99%

Gasification Fundamentals

Bell¹,

Towler²,

Fan³

2011

Coal Gasification and Its Applications

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“…These changes in surface area and porosity will also influence the high pressure reactivity of the chars. 22 A further complication on structure is provided by the annealing and deactivation of the carbon structure with increased exposure to high temperatures (Hurt et al, 1998 19 ;Seneca et al, 1998 20 ). Such deactivation needs to be considered at the longer residence times in the two-stage gasifier and potentially for the char that is recycled.…”

Section: Char Morphologymentioning

confidence: 99%

A Computational Workbench Environment for Virtual Power Plant Simulation

Bockelie¹,

Swensen²,

Denison³

et al. 2004

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This is the thirteenth Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT41047. The goal of the project is to develop and demonstrate a Virtual Engineeringbased framework for simulating the performance of Advanced Power Systems. Within the last quarter, good progress has been made on all aspects of the project. Software development efforts have focused on a preliminary detailed software design for the enhanced framework. Given the complexity of the individual software tools from each team (i.e., Reaction Engineering International, Carnegie Mellon University, Iowa State University), a robust, extensible design is required for the success of the project. In addition to achieving a preliminary software design, significant progress has been made on several development tasks for the program. These include: 1) the enhancement of the controller user interface to support detachment from the Computational Engine and support for multiple computer platforms, 2) modification of the Iowa State University interface-to-kernel communication mechanisms to meet the requirements of the new software design, 3) decoupling of the Carnegie Mellon University computational models from their parent IECM (Integrated Environmental Control Model) user interface for integration with the new framework and 4) development of a new CORBA-based model interfacing specification. A benchmarking exercise to compare process and CFD based models for entrained flow gasifiers was completed. A summary of our work on intrinsic kinetics for modeling coal gasification has been completed. Plans for implementing soot and tar models into our entrained flow gasifier models are outlined. Plans for implementing a model for mercury capture based on conventional capture technology, but applied to an IGCC system, are outlined.

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Modeling char combustion: The influence of parent coal petrography and pyrolysis pressure on the structure and intrinsic reactivity of its char

Cited by 83 publications

References 16 publications

Analysis of Porous Structure Parameters of Biomass Chars Versus Bituminous Coal and Lignite Carbonized at High Pressure and Temperature—A Chemometric Study

Analysis of Porous Structure Parameters of Biomass Chars Versus Bituminous Coal and Lignite Carbonized at High Pressure and Temperature—A Chemometric Study

Gasification Fundamentals

A Computational Workbench Environment for Virtual Power Plant Simulation

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