Flexibility enhancement of combined heat and power unit integrated with source and grid-side thermal energy storage

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2024-10-24 DOI:10.1016/j.energy.2024.133568

Chengxu Chen , Xiaoze Du , Lizhong Yang , Alessandro Romagnoli

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引用次数: 0

Abstract

The potential of improvement of both overall energy efficiency and penetration of renewable energy for the combined heat and power (CHP) unit was investigated by integrating the source-side and grid-side thermal energy storage (TES) systems simultaneously. The mathematical model of the proposed thermal system was established, with which the flexibility-enhancing features across diverse operating conditions were analyzed. The flexibility improvement rate, heat consumption rate, TES cycle efficiency and energy efficiency were revealed. Moreover, the wind power consumption, coal-savings and net annual revenue of CHP unit integrated with different TES were presented. The results indicated that the flexibility improvement rate of source-side TES, grid-side TES and dual TES is 2.4 %, 21.2 % and 26.2 %, respectively. The heat consumption rate of a CHP unit integrated with source-side TES system is lower compared to that of a traditional CHP unit when power load ratio is below 50 %. The CHP unit integrated with a dual TES system exhibited a maximum increase in wind power accommodation rate of 37.7 % and a maximum reduction in standard coal consumption of 7.7 %. The proposed systems offer a promising approach for enhancing the flexibility of CHP units to accommodate more renewable energy.

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提高热电联产机组的灵活性，集成源和电网侧热能储存功能

通过同时集成源侧和电网侧热能储存（TES）系统，研究了提高热电联产（CHP）装置整体能效和可再生能源渗透率的潜力。建立了拟议热力系统的数学模型，分析了该系统在不同运行条件下提高灵活性的特性。分析结果显示了灵活性提高率、热消耗率、TES 循环效率和能源效率。此外，还给出了集成不同 TES 的热电联产机组的风电消耗、节煤量和年净收益。结果表明，源侧 TES、电网侧 TES 和双 TES 的灵活性改善率分别为 2.4%、21.2% 和 26.2%。与传统热电联产机组相比，当电力负荷率低于 50 % 时，集成了源侧 TES 系统的热电联产机组的热消耗率较低。集成了双 TES 系统的热电联产机组最大风电容纳率提高了 37.7%，最大标准煤耗降低了 7.7%。所建议的系统为提高热电联产机组的灵活性以容纳更多可再生能源提供了一种可行的方法。

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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.