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<p>With the integration of renewable energy sources into energy supply systems, coal-fired thermal power plants require a feasible and effective approach for renovation. This paper combines the technology of steam extraction and the idea of integrated energy system to establish an integrated energy system based on coal-fired thermal power plant. It supplies steam, cooling, heating and power for users by employing unit modifications. And a reference system is set up for comparison. Detailed models for system calculations, thermodynamic performance, and economic indexes are developed. Energy, exergy and economic performances are analyzed on the proposed system. The results show that when the steam, cooling, heating and power loads are 100 t/h, 20 MW, 80 MW and 225 MW respectively, the primary energy utilization rate, total exergy efficiency and dynamic payback period of the proposed system are 61.51%, 36.13% and 1.75 years respectively. Compare to the reference system, the proposed system offers significant advantages in both thermodynamics and economics. Furthermore, a tri-objective optimization algorithm based on the NSGA-II, combined with the TOPSIS, has been developed to optimize the integrated energy renovation of coal-fired thermal power plants; additionally, the optimal supply of energy products is obtained. The optimization method can provide support and reference for the renovation of coal-fired thermal power plants.</p>

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Thermodynamic and Economic Analysis and Optimization of Integrated Energy System Based on Coal-Fired Thermal Power Plant

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Shuhan Xu,
  • Wenhuan Wang,
  • Lin Shi,
  • Xiaoye Dai

摘要

With the integration of renewable energy sources into energy supply systems, coal-fired thermal power plants require a feasible and effective approach for renovation. This paper combines the technology of steam extraction and the idea of integrated energy system to establish an integrated energy system based on coal-fired thermal power plant. It supplies steam, cooling, heating and power for users by employing unit modifications. And a reference system is set up for comparison. Detailed models for system calculations, thermodynamic performance, and economic indexes are developed. Energy, exergy and economic performances are analyzed on the proposed system. The results show that when the steam, cooling, heating and power loads are 100 t/h, 20 MW, 80 MW and 225 MW respectively, the primary energy utilization rate, total exergy efficiency and dynamic payback period of the proposed system are 61.51%, 36.13% and 1.75 years respectively. Compare to the reference system, the proposed system offers significant advantages in both thermodynamics and economics. Furthermore, a tri-objective optimization algorithm based on the NSGA-II, combined with the TOPSIS, has been developed to optimize the integrated energy renovation of coal-fired thermal power plants; additionally, the optimal supply of energy products is obtained. The optimization method can provide support and reference for the renovation of coal-fired thermal power plants.