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【目的】中国新能源电力装机容量逐年提升，其随机性和波动性要求煤电机组具备灵活调峰能力并能够实现宽负荷高效运行，因此，需要开展大型煤电机组超低负荷下的节能提效技术研究。为进一步提升超超临界机组的节能潜力，需要对机组进行回热系统改造。【方法】本文以某1 000 MW二次再热超超临界机组为研究对象，从总能系统理论的角度出发，提出在回热系统中增设回热汽轮机提高发电量，并通过增加抽汽级数实现蒸汽热能的梯级利用的改造方案，利用Ebsilon软件计算和对比机组在基准方案（原未改造方案）和改造方案下，30%热耗率验收（turbine heat acceptance,THA）工况和20%THA负荷工况下的热力学参数，探究改造方案的优化效果。【结果】研究表明，相比于基准机组，改造机组在30%THA工况下，煤耗率降低6.279 g/（k W·h），㶲效率提高0.965%，热耗率降低2.213%，热效率提高1.05%，汽耗率降低0.038 kg/（kW·h）；在20%THA工况下，煤耗率降低11.480 g/（kW·h），㶲效率提高1.633%，热耗率降低3.860%，热效率提高1.775%，汽耗率降低0.069 kg/（kW·h）。超低负荷下工况下，在机组回热系统中增设回热汽轮机可以显著降低煤耗，提升效率。【结论】在超低负荷工况下，大型二次再热机组采用双机回热系统改造方案具有节能提效效果，可供同类机组节能改造时参考。
Abstract：[Objective] The installed capacity of China's new energy power is increasing year by year. Its randomness and volatility require coal-fired power units to have flexible peak-shaving capabilities and be able to achieve efficient operation under wide load. Therefore, it is necessary to carry out research on energy-saving and efficiency-increasing technologies for large-scale coal-fired power units under ultra-low load. In order to further enhance the energy-saving potential of ultra-supercritical units, it is necessary to retrofit the regenerative system of the unit. [Methods] In this paper, a 1 000 MW double-reheat ultra-supercritical unit is taken as the research object. From the perspective of the total energy system theory, it is proposed to add a regenerative steam turbine to the regenerative system to increase the power generation, and to realize the cascade utilization of steam heat energy by increasing the number of extraction stages using Ebsilon. The thermodynamic parameters of the unit under the 30% turbine heat acceptance(THA) condition and the 20% THA load condition under the reference scheme and the retrofit scheme are calculated and compared, and the optimization effect of the retrofit scheme is explored. [Results] The results show that compared with the reference unit, under the condition of 30%THA, the coal consumption rate of the modified unit is reduced by 6.279 g/(kW·h), the exergy efficiency is increased by 0.965%, the heat consumption rate is reduced by 2.213%, the thermal efficiency is increased by 1.05%, and the steam consumption rate is reduced by 0.038 kg/(kW·h). Under the condition of 20%THA, the coal consumption rate decreases by 11.480 g/(kW·h), the exergy efficiency increases by 1.633%, the heat consumption rate decreases by 3.860%, the thermal efficiency increases by 1.775%, and the steam consumption rate decreases by 0.069 kg/(kW·h). Under the condition of ultra-low load, adding regenerative steam turbine in the regenerative system of the unit can significantly reduce coal consumption and improve efficiency. [Conclusion] Under the condition of ultra-low load, the transformation scheme of double-machine regenerative system for large double-reheat unit has the effect of energy saving and efficiency improvement, which can be used as a reference for the energy saving transformation of similar units.
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基本信息:
DOI：10.19944/j.eptep.1674-8069.2026.01.011
中图分类号:TM621
引用信息:
[1]高行龙,张海峰,陈国庆,等.1000 MW超超临界二次再热机组双机回热系统改造提效研究[J].电力科技与环保,2026,42(01):104-114.DOI:10.19944/j.eptep.1674-8069.2026.01.011.
基金信息:
低碳智能燃煤发电与超净排放全国重点实验室开放课题（D2023FK092）; 国家自然科学基金项目（12372261）; 国家能源集团科技创新项目（GJNY-23-68）
2026-02-13
2026-02-13