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Numerical investigations on a thermoelectric generator based on diesel engine integrated DOC+DPF+SCR aftertreatment

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  • Li, Yuxuan
  • Hu, Jie
  • Wang, Yiping
  • Liu, Xun

Abstract

Thermoelectric technology improves engine energy efficiency by recovering waste heat from the exhaust gases of internal combustion engines. Compared to a conventional thermoelectric generator (TEG), TEG integration in engine aftertreatment can improve power generation and reduce TEG impact on engine back pressure. In the current study, a three-dimensional numerical model of TEG based on an integrated aftertreatment for diesel engines was proposed for the first time, with related research conducted through numerical simulations. The results show that the exhaust temperatures and gas compositions under the three operating conditions significantly influence the hot-side temperature of thermoelectric modules (TEMs), resulting in single-row TEM output power of 26.5 W, 32.89 W, and 39.74 W, respectively. The cooling effect of urea water solution (UWS) on the hot side of the TEM is substantial. Additionally, the location of the DOC significantly influences output power, with an increase of up to 13.35 %. TEMs located near DOC are influenced by the heat from chemical reactions and the properties of the porous medium. It is of great significance to improve energy efficiency and reduce environmental pollution through the rational use of TEG in diesel-engine vehicles under current and future emission regulations.

Suggested Citation

  • Li, Yuxuan & Hu, Jie & Wang, Yiping & Liu, Xun, 2025. "Numerical investigations on a thermoelectric generator based on diesel engine integrated DOC+DPF+SCR aftertreatment," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225005006
    DOI: 10.1016/j.energy.2025.134858
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