Comparative investigations of coal pyrolysis under inert gas and H2 at low and high heating rates and pressures up to 10 MPa

Arendt, P. N.; Heek, Karl-Heinrich van

doi:10.1016/0016-2361(81)90138-1

Cited by 130 publications

(33 citation statements)

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“…However, the yield of the light hydrocarbon gases remains nearly constant. It has also been reported in the literature [40] that the gain in tar yield with increase in the heating rate is higher for the low-volatile coals than that for the high-volatile coals. This also supports the fact that the low-volatile coals are heated more quickly than the high-volatile coals.…”

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confidence: 77%

“…A rapid release of volatile matter limits the secondary reactions, thereby increasing the yield of volatiles beyond the proximate volatile content of the coal. It has been reported in the literature [40] that the rapid increase in temperature at the high heating rates decreases the residence time of volatile material. It reduces the influence of cracking and more tarry liquid is produced.…”

mentioning

confidence: 97%

“…There can be variation in the yield of volatile matter during devolatilization depending on the volatile content of the coal. The rapid increase in temperature at the high heating rates reduces the residence time of volatile material [40]. It reduces the effect of cracking of tarry matters inside the particle and hence more tarry liquid is produced.…”

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confidence: 99%

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A review on devolatilization of coal in fluidized bed

Borah

Ghosh

Rao

2011

Int. J. Energy Res.

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SUMMARYDevolatilization is an important step in fluidized bed combustion and gasification of coal. 'Devolatilization' is a general term that signifies the removal of volatile matters from the coal matrix. It is an extremely important step because the combustion of volatile matter can account for 50% of the specific energy of fluidized bed combustion of a high-volatile coal. Significant insights into the complex physicochemical phenomena that occur during devolatilization have been obtained in the recent years. This review focuses on the devolatilization of coal in an inert gas, air, and oxygen-enriched air, with emphasis on the effects of the operating parameters (e.g. temperature, heating rate, pressure, and gas velocity) on the yield of volatile matter. Particle size, oxygen content of the fluidizing gas, volatile content of coal and specific heat are some of the other important parameters for the devolatilization of coal. This review also explains the development and application of structural and empirical models. The structural models (e.g. FG-DVC and CPD models) are fairly complex. However, they can accurately predict the yields of gas and tar. It is observed from the review of the literature that the mechanism of coal devolatilization needs further study. Although the shrinking-core model can describe the devolatilization in the beginning and toward the end of the process, major deviations are often observed. The economic studies reveal that the capital cost of fluidized bed combustion reduces upon doubling the capacity. Some problems associated with bubbling fluidized bed combustion (e.g. the increase in freeboard temperature) have been explained with the present knowledge of devolatilization.

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A review on devolatilization of coal in fluidized bed

Borah

Ghosh

Rao

2011

Int. J. Energy Res.

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“…Many researchers are interested in the production gasoline fraction in FT synthesis using ZSM-5 [8,9] as the support. Besides this zeolite, mordenite [10], MCM-22 [11], b [12] and ITQ [13] etc. have also been used.…”

Section: Introductionmentioning

confidence: 98%

Application of mesoporous ZSM-5 as a support for Fischer–Tropsch cobalt catalysts

Wang

Zhao

et al. 2014

J Porous Mater

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The effect of mesoporous structure of ZSM-5 on the properties of cobalt-based catalysts for FischerTropsch synthesis was studied in this work. ZSM-5 and amorphous SiO 2 supports have also been applied for comparison. It was shown that post treatment of ZSM-5 catalyst by NaOH solution improved the catalytic performance to produce higher amount of liquid hydrocarbons. The hierarchical structure combining with the acidity of meso-ZSM-5 had great effect on increasing the selectivity to C 5-18 hydrocarbons and preventing the formation of CH 4 . The more acid sites of the support promoted catalytic cracking reaction of olefinic hydrocarbons to light hydrocarbons, the lower olefin to paraffin ratio was observed over Co/meso-ZSM-5 catalyst compared with that of Co/ SiO 2 catalyst.

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“…[12][13][14] is an overview of a model interface specification that represents achievement of our project milestone for Q1 of GFY2004. Provided in Appendix A is a detailed description of the proposed model interface specification.…”

Section: Executive Summarymentioning

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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Comparative investigations of coal pyrolysis under inert gas and H2 at low and high heating rates and pressures up to 10 MPa

Cited by 130 publications

References 2 publications

A review on devolatilization of coal in fluidized bed

A review on devolatilization of coal in fluidized bed

Application of mesoporous ZSM-5 as a support for Fischer–Tropsch cobalt catalysts

A Computational Workbench Environment for Virtual Power Plant Simulation

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