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

Nsakala, N.Y.; Walker, P.L.; Essenhigh, Robert H.

doi:10.2172/5029849

Cited by 8 publications

(19 citation statements)

References 17 publications

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“…Other details of method and construction are to be found elsewhere (Badzioch and Hawksley, 1970;Nsakala, 1976).…”

Section: Methodsmentioning

confidence: 99%

“…These included initial cold model tests to determine the injector probe and flow straitener design that would minimize radial spread of the particles (see Nsakala, 1976), as well as temperature measurements to determine conditions for uniform gas temperatures. In other experiments, the Pittsburgh Seam bituminous coal (E-5, see Table 1) was found difficult to handle because it plugged the collector tube.…”

Section: Preliminary Experimentsmentioning

confidence: 99%

“…Estimates (Nsakala, 1976) of heating rates of particles plunged into hot gas indicate that even at 8000°C;sec heating rate no significant temperature gradient exists in the particles on reaching reactor temperature (808°C) after 95 msec.…”

Section: Reproducibility Of Weight Loss Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Studies on Coal Reactivity: Kinetics of Lignite Pyrolysis in Nitrogen at808°C

Nsakala

Essenhigh

Walker

1977

Combustion Science and Technology

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Lignites pyrolyzed in nitrogen have provided direct evidence for a two-component model of coal constitution. The pyrolysi s was studied in an electrically heated 5.1 ern i.d. laminar-flow furnace using four closely sized cuts (58, 64, 86, and 180 microns). Pyrolysis was under isothermal conditions, at 808°C, for periods up to I sec, following a heating period of 95 msec, at 8000°C/sec rate of heating. Pyrolysis times in excess of 200 msec were obtained by recycling, experiments having shown that this did not affect the kinetics. Variations of weight loss with time were found to be in agreement with equations based on a two component model in which two independent parallel reactions are assumed to occur. Notably, weight loss declined approximately exponentially with time, with a sharp break in the lines obtained for pyrolysis times in excess of 200 msec. Slopes of the lines yielded values of the relevant kinetic constants, with Component "I" decomposition dependent on particle size over the range stud ied, but the slower-reaction of Component "II" being independent of size. The rat io of Component I to Component II is estimated at about 10 to I. In other results, the proportionality between weight loss and ASTM volatile loss of the char, as first reported by Badzioch and Hawksley was reconfirmed, with Q factors for the coals studied of 1.8 and 2.

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“…Other details of method and construction are to be found elsewhere (Badzioch and Hawksley, 1970;Nsakala, 1976).…”

Section: Methodsmentioning

confidence: 99%

Section: Preliminary Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Studies on Coal Reactivity: Kinetics of Lignite Pyrolysis in Nitrogen at808°C

Nsakala

Essenhigh

Walker

1977

Combustion Science and Technology

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“…Nskala et al [15] studied characteristics of chars produced by pyrolysis following rapid heating of pulverized coal. They used a furnace 5 cm I.D.…”

Section: Previous Pyrolysis Workmentioning

confidence: 99%

Waste Plastic Pyrolysis in Free‐Fall Reactors

Bilgesü

Koçak

Karaduman

2006

Feedstock Recycling and Pyrolysis of Waste Plastics

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“…in diameter and is collected in a standard gas sampling bottle 9 • Surface area measurements of solid samples are discussed in detail by Gan et al . 11 and Nsakala 12 • The method of determining the surface area consTSts-of measuring either the adsorbed quantities of gas or vapor, or the heat effect resulting when coal is brought into contact with liquids 12 • The well knonw BET adsorption method in this preliminary experiment uses nitrogen at 77°K and carbon dioxide at room temperature (25°C). The surface area of any adsorbent consists of the total internal wall area of the pores plus the outside geometric area of the coal or char particles.…”

Section: Figure 17 Arrhenius Plots For Gasification Of Saran Carbonmentioning

confidence: 99%