Low Temperature Carbonization Rates in a Fluidized Bed

Stone, Herman; Batchelor, James D.; Johnstone, H. F.

doi:10.1021/ie50530a024

Cited by 26 publications

(6 citation statements)

References 3 publications

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“…Many researchers have attempted to develop methods to quantify kinetic behavior of coal pyrolysis. The most common way is to develop overall mass-change expressions for the solid and therefore for the volatiles without the knowledge on chemical changes in the solid and distribution of the volatiles especially the tar [1][2][3][4]. Another common way is to correlate pyrolysis conditions with the formation of particular products, such as methane, hydrogen, solvent soluble fractions or sulfur compounds [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis behavior and bonding information of coal — A TGA study

Shi

Liu

Guo

et al. 2013

Fuel Processing Technology

400

165

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Section: Introductionmentioning

confidence: 99%

Pyrolysis behavior and bonding information of coal — A TGA study

Shi

Liu

Guo

et al. 2013

Fuel Processing Technology

400

165

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“…He underestimated weight loss by using Shapatirie et al's method of calculation. 17 Stone et al 21 studied the kinetics of pyrolysis of three American coals under experimental conditions similar to those of Pitt.…”

mentioning

confidence: 99%

Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal. [104 references]

Nsakala¹,

Walker²,

Essenhigh³

1977

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“…Experimental support for these models has been presented in a number of works [26,29,37,[99][100][101][102][103][104][105][106][107][108]. The shown by the solid lines [98].…”

Section: Empirical Models Of Coal Devolatilizationmentioning

confidence: 99%

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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Low Temperature Carbonization Rates in a Fluidized Bed

Cited by 26 publications

References 3 publications

Pyrolysis behavior and bonding information of coal — A TGA study

Pyrolysis behavior and bonding information of coal — A TGA study

Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal. [104 references]

A review on devolatilization of coal in fluidized bed

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