The purpose of the new formulas, Cml, CmlK, and CmlY, which express the slowest char combustion rate, is to show the controlling mechanism of single coal burning. Oxygen diffusion through the boundary layer (as a result of releasing volatile matter from coal) to the char surface is the slowest step rate and can also represent as the rate determining. This step has not yet been taken into account in the literature and may effect incomparable decisions between numerical and experimental results of coal combustion studies. In the 1920s, Wilhelm Nusselt found the coal combustion equation for a single coal, which is based on initial coal diameter, and its burning time, or Nusselt square law (NSL). Also, the burning constant in NSL expressed oxygen partial pressure and the ambient temperature level. Nevertheless, recent studies according to char combustion have explained the effect of coal density on char combustion. Consequently, to help understand the slowest rate of char combustion, NSL as well as ordinary char combustion equations can be used together to establish the rate-determining factor. For this purpose, in this study, the slowest step of the char reaction rate is given as “Cml” of stable position for single coal particle, “CmlK” and “CmlY” for a coal particle in a motion.
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November 2018
This article was originally published in
Journal of Heat Transfer
Research-Article
The New Equations for “Rate-Determining Chemisorption of Coal”
Cemil Koyunoğlu
Cemil Koyunoğlu
Energy Institute,
Ayazaga Campus,
Istanbul Technical University,
Maslak, Istanbul 34469, Turkey;
EMS Energy Institute,
Coal Utilization Laboratory,
The Pennsylvania State University,
University Park, PA 16802
e-mail: ckoyunoglu@itu.edu.tr
Ayazaga Campus,
Istanbul Technical University,
Maslak, Istanbul 34469, Turkey;
EMS Energy Institute,
Coal Utilization Laboratory,
The Pennsylvania State University,
University Park, PA 16802
e-mail: ckoyunoglu@itu.edu.tr
Search for other works by this author on:
Cemil Koyunoğlu
Energy Institute,
Ayazaga Campus,
Istanbul Technical University,
Maslak, Istanbul 34469, Turkey;
EMS Energy Institute,
Coal Utilization Laboratory,
The Pennsylvania State University,
University Park, PA 16802
e-mail: ckoyunoglu@itu.edu.tr
Ayazaga Campus,
Istanbul Technical University,
Maslak, Istanbul 34469, Turkey;
EMS Energy Institute,
Coal Utilization Laboratory,
The Pennsylvania State University,
University Park, PA 16802
e-mail: ckoyunoglu@itu.edu.tr
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 30, 2017; final manuscript received June 19, 2018; published online July 23, 2018. Assoc. Editor: Ali Khounsary.
J. Heat Transfer. Nov 2018, 140(11): 112001 (8 pages)
Published Online: July 23, 2018
Article history
Received:
October 30, 2017
Revised:
June 19, 2018
Citation
Koyunoğlu, C. (July 23, 2018). "The New Equations for “Rate-Determining Chemisorption of Coal”." ASME. J. Heat Transfer. November 2018; 140(11): 112001. https://doi.org/10.1115/1.4040610
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