利用热能储存系统的热量释放提高燃煤发电厂的发电潜力：限制和热力学性能

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2024-10-25 DOI:10.1016/j.energy.2024.133509

Lin Miao, Hui Yan, Ming Liu

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引用次数: 0

摘要

集成热能储存（TES）系统是提高燃煤发电厂（CFPP）负荷循环率的有效方法。为了评估通过熔盐热储系统释放热量为燃煤电厂增加电能的潜力和热力学性能，比较评估了与热储系统集成的燃煤电厂的八种放电模式，包括蒸汽喷射、加热器旁路和附加汽轮机方案。开发了集成系统的系统仿真模型，并评估了拟议系统的热力学性能。结果表明，在 75%THA 的基准条件下，SI-HPT（高压汽轮机蒸汽喷射）模式的输出功率增幅最大，达到 25.00%，但 HB-LPH（低压加热器旁路）模式的输出功率增幅很低，仅为 2.08%。此外，外部热源会通过改变朗肯循环的平均吸热温度和蒸汽/水循环的内部不可逆性来改变发电效率。在 75%THA 的典型基准排汽条件下，汽轮机在 SI-LPT（低压汽轮机蒸汽喷射）模式下的发电效率可从 47.41% 降低到 44.15%，但在 SI-HPT 模式下可从 47.41% 提高到 48.86%。当 TES 系统的温度范围高于 600 ℃ 和低于 450 ℃ 时，SI-HPT 和 SI-LPT 模式分别获得最佳综合性能。该研究可为 CFPP 的改造提供科学指导，实现高效灵活的设计。

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Power increase potential of coal-fired power plant assisted by the heat release of the thermal energy storage system: Restrictions and thermodynamic performance

The integration of a thermal energy storage (TES) system is an effective way to improve the load cycling rate of coal-fired power plants (CFPPs). To evaluate the power increase potential and thermodynamic performance of CFPP supplied by heat release of the molten salt TES system, eight discharging modes for CFPP integrated with the TES system including steam injection, heater bypass, and additional turbine schemes were comparatively evaluated. The system simulation models of the integrated systems were developed and the thermodynamic performance of the proposed system were evaluated. Results show that the mode SI-HPT (high-pressure turbine steam injection) has the largest output power increase of 25.00 % under the benchmark condition of 75%THA, but the mode HB-LPH (low-pressure heater bypass) shows a very low output power increase of 2.08 %. Moreover, the power generation efficiency is changed by the external heat source through a change in the average heat absorption temperature of the Rankine cycle and the internal irreversibility of the steam/water cycle. Under the typical benchmark discharging condition of 75%THA, the power generation efficiency of the turbine in mode SI-LPT (low-pressure turbine steam injection) can be reduced from 47.41 % to 44.15 %, but it can be increased from 47.41 % to 48.86 % in mode SI-HPT. When the temperature ranges of the TES system are above 600 °C and below 450 °C, the modes SI-HPT and SI-LPT obtain the optimal comprehensive performance, respectively. This study can provide the scientific guidance for retrofit for CFPP to achieve efficient and flexible design.

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.