Energy Conversion and Management最新文献

英文中文

Dynamic characteristics of Coal-Fired power units coupled with carbon capture systems using an optimized off-design operation algorithm 基于优化非设计运行算法的燃煤发电机组与碳捕集系统耦合动态特性研究

IF 10.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management

Pub Date : 2026-04-01 Epub Date: 2026-02-12 DOI: 10.1016/j.enconman.2026.121213

Lihua Cao, Yaoli Wang, Heyong Si, Yujie Cui, Taolue Dong

To explore the dynamic characteristics of ultra-supercritical double-reheat coal-fired power units (CFPU) coupled with carbon capture system (CCS) under variable operating conditions (from 50% THA to 100% THA), a dynamic mathematical model of the CFPU-CCS was developed. The optimized off-design operation algorithm for the steam turbine was proposed to establish a bidirectional coupling relationship of energy and mass between the CFPU and CCS. The thermodynamic parameters of the steam turbine flow section and regenerative system influenced by carbon capture were obtained. The coupling variation of CFPU-CCS with different dynamic step signals was revealed. Results show that the optimized algorithm enhances thermodynamic calculation accuracy. A bidirectional coupling effect exists between the thermodynamic process of the CFPU and the CCS, which alters the distribution of extraction parameters and exhibits dynamic changes. Switching the steam source causes the extraction steam flow rates of stages 5 to 10 that are opposite to those in the high-load range. The flow rate gain and temperature drop of stage 3 extraction steam increase. The CCS exhibits sensitivity to step changes. The response is slow but stable at high load, and rapid but volatile at low load. The response time to fuel quantity step is the longest, approximately 600 to 800 s. The response time to feedwater flow rate step is 550 to 700 s. The response time to valve step is the shortest, around 500 to 600 s.

为探索超超临界双再热燃煤发电机组（CFPU）与碳捕集系统（CCS）在变工况（50% ~ 100% THA）下的动态特性，建立了CFPU-CCS的动态数学模型。提出了汽轮机非设计工况优化运行算法，建立了CFPU与CCS之间的能量质量双向耦合关系。得到了受碳捕集影响的汽轮机流段和蓄热系统的热力学参数。揭示了CFPU-CCS在不同动态阶跃信号下的耦合变化。结果表明，优化后的算法提高了热力学计算精度。CFPU与CCS的热力过程存在双向耦合效应，改变了提取参数的分布，呈现动态变化。切换蒸汽源导致第5级至第10级的抽汽流量与高负荷范围内的抽汽流量相反。三级抽汽的流量增益和温度降增大。CCS对阶跃变化非常敏感。高负荷时响应缓慢但稳定，低负荷时响应迅速但不稳定。燃油量步长响应时间最长，约为600 ~ 800s。对给水流量阶跃的响应时间为550 ~ 700s。阀步长响应时间最短，约为500 ~ 600s。

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