A comparison of simple global kinetic models for coal devolatilization with the CPD model

Richards, Andrew P.; Fletcher, Thomas H.

doi:10.1016/j.fuel.2016.07.095

Title: A comparison of simple global kinetic models for coal devolatilization with the CPD model

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Fuel

DOI:https://doi.org/10.1016/j.fuel.2016.07.095· OSTI ID:1362067

Richards, Andrew P. ^[1]; Fletcher, Thomas H. ^[1]

Brigham Young Univ., Provo, UT (United States)

Simulations of coal combustors and gasifiers generally cannot incorporate the complexities of advanced pyrolysis models, and hence there is interest in evaluating simpler models over ranges of temperature and heating rate that are applicable to the furnace of interest. In this paper, six different simple model forms are compared to predictions made by the Chemical Percolation Devolatilization (CPD) model. The model forms included three modified one-step models, a simple two-step model, and two new modified two-step models. These simple model forms were compared over a wide range of heating rates (5 × 10³ to 10⁶ K/s) at final temperatures up to 1600 K. Comparisons were made of total volatiles yield as a function of temperature, as well as the ultimate volatiles yield. Advantages and disadvantages for each simple model form are discussed. In conclusion, a modified two-step model with distributed activation energies seems to give the best agreement with CPD model predictions (with the fewest tunable parameters).

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Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002375

OSTI ID:: 1362067

Alternate ID(s):: OSTI ID: 1326230; OSTI ID: 1396663

Report Number(s):: DOE-UTAH-DENA-0002375-FLETCHER-0008; DOE-UTAH-RICHARDS-0002; PII: S0016236116306986

Journal Information:: Fuel, Vol. 185, Issue C; ISSN 0016-2361

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Title: A comparison of simple global kinetic models for coal devolatilization with the CPD model

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