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Numerical investigation on the impact of variable particle radiation properties on the heat transfer in high ash pulverized coal boiler through co-simulation

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  • Laubscher, Ryno
  • Rousseau, Pieter

Abstract

Co-simulation of the high-temperature heat and mass transfer processes in coal-fired boilers using CFD together with process-level models of the water/steam circuit is a promising approach to investigate off-design conditions. In the present work, a 1D discretized two-phase model of the water flows in the evaporator and radiative superheaters was developed. This was coupled with a detailed furnace combustion and heat transfer CFD model. The coupled models are used to investigate the impact of variable particle emissivity and scattering efficiency on the evaporator and radiant superheater process conditions, including the furnace steam generation rate and final steam temperature. The results are compared with the case where the radiation properties of the particles are assumed to be constant, thereby highlighting the importance of accounting for the variations in the particle properties throughout the process. The case study boiler is that of a real 620 MWe subcritical power plant firing coal with a high ash content (41 %wt). The results show that the constant property model results in a predicted furnace heat load that is 6.5% lower than the experimental value, while the conversion-dependent model is only 0.7% lower than the experimental value.

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  • Laubscher, Ryno & Rousseau, Pieter, 2020. "Numerical investigation on the impact of variable particle radiation properties on the heat transfer in high ash pulverized coal boiler through co-simulation," Energy, Elsevier, vol. 195(C).
    • Handle: RePEc:eee:energy:v:195:y:2020:i:c:s0360544220301134
    DOI: 10.1016/j.energy.2020.117006
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    References listed on IDEAS

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    Cited by:

    1. Hyunbin Jo & Jongkeun Park & Woosuk Kang & Junseok Hong & Sungmin Yoon & Howon Ra & Changkook Ryu, 2021. "Influence of Uneven Secondary Air Supply and Burner Tilt on Flow Pattern, Heat Transfer, and NOx Emissions in a 500 MWe Tangential-Firing Coal Boiler," Energies, MDPI, vol. 14(24), pages 1-18, December.
    2. Xin Guo & Guangbo Zhao & Zhecheng Zhang & Dongdong Feng & Yongjie Wang & Zhengshun Zhang, 2023. "A Real-Time Calculation Method to Improve Boiler Safety in Deep Peak Shaving Cases," Energies, MDPI, vol. 16(13), pages 1-19, June.
    3. Pieter Rousseau & Ryno Laubscher & Brad Travis Rawlins, 2023. "Heat Transfer Analysis Using Thermofluid Network Models for Industrial Biomass and Utility Scale Coal-Fired Boilers," Energies, MDPI, vol. 16(4), pages 1-49, February.
    4. Pei Li & Ting Bao & Jian Guan & Zifu Shi & Zengxiao Xie & Yonggang Zhou & Wei Zhong, 2023. "Computational Analysis of Tube Wall Temperature of Superheater in 1000 MW Ultra-Supercritical Boiler Based on the Inlet Thermal Deviation," Energies, MDPI, vol. 16(3), pages 1-15, February.
    5. Orumbayev, Rakhimzhan K. & Bakhtiyar, Balzhan T. & Umyshev, Dias R. & Kumargazina, Madina B. & Otynchiyeva, Marzhan T. & Akimbek, Gulmira A., 2021. "Experimental study of ash wear of heat exchange surfaces of the boiler," Energy, Elsevier, vol. 215(PA).

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