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With the continuous progress of the work of "carbon neutrality and carbon peak", the installed scale of photovoltaic, wind power and other new energy is expanding, energy saving and consumption reduction as well as flexibility improvement become the two key tasks the thermal power units faced. Through mathematical modeling and hourly calculation analysis for the hybrid system, performance and economic characters for solar-thermal systems replacing high pressure heaters are obtained. The calculation results indicate that, using solar thermal and coal fired hybrid system can realize sharp decline of the unit coal consumption, which is a most direct and effective method for coal saving and reducing consumption, it has great significance for life prolonging of the units to be retired from active service because of high coal consumption indexes. However, the economic benefit of the system itself is insufficient. So it can be supplemented with molten salt electric heater to improve the system's frequency modulation ability and enhance the project's profitability. According to the calculation, when the frequency modulation income is not considered, the system's yield is only 6.0%, but it can be increased to 8.0% after considering the frequency modulation income. Therefore, the hybrid system has double effects in improvement of both coal saving transformation and flexibility transformation.

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随着“碳达峰、碳中和”工作不断推进，光伏、风电等新能源装机规模不断扩大，火电机组的节能降耗与灵活性提升成为其2项关键任务。针对光煤互补系统，通过数学建模与逐时计算分析，获得了采用光热系统取代高压加热器的节煤改造方法的投资及收益特征。结果表明，利用光煤互补系统能够实现机组煤耗的大幅度下降，是一种最直接有效的节煤降耗方法，对因煤耗指标过高而面临退役的机组具有重要的延寿意义，但其本身经济效益不足。对此，可以补充熔盐电加热器进行系统调频能力提升，利用调频收益弥补节煤改造的投资收益不足。通过测算，光煤互补系统收益率在不考虑调频收益时仅为6.0%，考虑调频收益后为8.0%。因此，利用光煤互补系统结合熔盐电加热器能够实现节煤改造与灵活性改造双效提升。

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钱兆跃（1974），女，硕士，高级工程师，主要研究方向为光热及火力发电系统，qianzhaoyue@nwepdi.com。

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钱兆跃（1974），女，硕士，高级工程师，主要研究方向为光热及火力发电系统，qianzhaoyue@nwepdi.com。

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