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A two-dimensional distributed activation energy model for pyrolysis of solid fuels

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  • Ma, Junfang
  • Liu, Jiaxun
  • Jiang, Xiumin
  • Zhang, Hai

Abstract

Pyrolysis kinetic models are pivotal for understanding and optimizing the gasification, distillation, and combustion processes. This paper proposes a novel two-dimensional distributed activation energy model (2D-DAEM), which is achieved via extending the classical DAEM to the 2D plane of activation energy E and pre-exponential factor A. The performance of the proposed model was evaluated based upon comprehensive analyses of complex reactions such as co-pyrolysis. The results show that the 2D-DAEM outperforms the classical DAEM in terms of efficiency and accuracy. Specifically, the co-pyrolysis analysis of pine woodchips (PINE) and polyethylene terephthalate (PET), shows that the classical DAEM tends to underestimate the lnA values (i.e., 43.0 for PINE pyrolysis; 42.0 for PET pyrolysis; but 39.2 for PINE&PET co-pyrolysis), while the lnA value of 2D-DAEM (about 43.0 for all) is more reasonable. Additionally, the 2D-DAEM is employed to study the influence of coal particle size on pyrolysis. It is observed that the 25 μm coal has the highest reaction rate under both 500 K and 1500 K iso-thermal processes. As a more normative, reasonable, and accurate model, the proposed 2D-DAEM is bound to enhance the practice of reaction prediction, material analysis, and process design.

Suggested Citation

  • Ma, Junfang & Liu, Jiaxun & Jiang, Xiumin & Zhang, Hai, 2021. "A two-dimensional distributed activation energy model for pyrolysis of solid fuels," Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:energy:v:230:y:2021:i:c:s0360544221011087
    DOI: 10.1016/j.energy.2021.120860
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