100 MW级联式S-CO2循环动态特性研究

doi:10.11930/j.issn.1004-9649.202310090

摘要/Abstract

摘要：

为分析100 MW级联式超临界二氧化碳（supercritical carbon dioxide，S-CO₂）循环的变负荷动态特性和最佳变负荷控制策略，利用多学科仿真平台（multi-disciplinary simulation platform，MSP）建立了100 MW级联式S-CO₂循环的动态仿真模型，考虑阀门调节的低成本和快速性，提出了4种阀门调节的负荷控制策略（高温透平节流调节、低温透平节流调节、高温透平旁通调节和低温透平旁通调节），分析了系统升、降负荷过程中关键参数的变化规律，得出结论：不同负荷控制策略对压缩机功率的影响较小；采用高温透平节流调节具有最高的循环效率，负荷率为75%和50%时，循环效率分别为27.60%和21.22%；节流调节会引起系统最高压力增大，负荷率为50%时，采用高温透平节流调节的最高压力为28.57 MPa；采用旁通调节可以避免超压风险，但循环效率较低。在保证系统承压能力的前提下，建议采用高温透平节流调节方式调节负荷。

关键词: 级联式S-CO₂循环, 动态仿真, 变负荷, 控制策略, 循环效率

Abstract:

To analyze the variable load dynamic characteristics and optimal control strategy of the 100 MW cascade supercritical carbon dioxide (S-CO₂) cycle, the dynamic simulation model of the 100 MW cascade S-CO₂ cycle is established by using the multi-disciplinary simulation platform (MSP). Considering the lower cost and rapidity of valve regulation, four load control strategies were proposed (high-temperature turbine throttling regulation, low-temperature turbine throttling regulation, high-temperature turbine bypass regulation, and low-temperature turbine bypass regulation), and the changes of key parameters in the process of load raising and lowering of the system were analyzed. The results show that different load control strategies had little influence on the compressor power. The use of high-temperature turbine throttling regulation has the highest cycle efficiency, and the cycle efficiency is 27.60% and 21.22% when the load rate is 75% and 50%, respectively. The throttling regulation will cause the maximum pressure to increase, and the maximum pressure with high-temperature turbine throttling regulation is 28.57 MPa when the load rate is 50%. The risk of overpressure can be avoided by bypass adjustment, but the cycle efficiency is low. On the premise of ensuring the pressure-bearing capacity of the system, it is recommended to use the high-temperature turbine throttling adjustment method to adjust the load.

Key words: cascade S-CO₂ cycle, dynamic simulation, variable load, control strategy, cycle efficiency

万明元, 任鑫, 王渡, 金亚飞, 王志刚, 王廷举, 杨昌宏, 刘昊坤. 100 MW级联式S-CO₂循环动态特性研究[J]. 中国电力, 2024, 57(12): 169-177.

Mingyuan WAN, Xin REN, Du WANG, Yafei JIN, Zhigang WANG, Tingju WANG, Changhong YANG, Haokun LIU. Study of Dynamic Characteristics of 100 MW Cascade S-CO₂ Cycle[J]. Electric Power, 2024, 57(12): 169-177.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202310090

https://www.electricpower.com.cn/CN/Y2024/V57/I12/169

图/表 11

图 1 级联式S-CO2循环系统流程

Fig.1 The flow of the cascade S-CO2 cycle

图 2 级联式S-CO2循环温熵图

Fig.2 The Temperature-entropy diagram of the cascade S-CO2 cycle

表 1 模型验证结果

Table 1 Results of the model validation

参数	高温透平入口温度/℃	高温透平入口压力/MPa	低温透平入口温度/℃	低温透平入口压力/MPa	压缩机流量/ (kg·s^–1)	压缩机入口温度/℃	压缩机入口压力/MPa	压缩机出口温度/ ℃	压缩机出口压力/MPa	S-CO₂循环净功率/MW	循环效率/%
仿真值	551.2	27.79	298.20	27.65	1 243.40	32	7.7	73.10	27.98	118.90	32.20
文献值^[22]	551.2	27.86	302.00	27.72	1 240.00	32	7.7	73.20	28.00	118.50	32.10
误差/%	0	–0.25	–1.26	–0.25	0.27	0	0	–0.14	–0.07	0.34	0.10

图 3 净功率变化趋势

Fig.3 Trends of the net power

图 4 最低温度变化趋势

Fig.4 The lowest temperature change trend

图 5 最低压力变化趋势

Fig.5 Trend of the minimum pressure change

图 6 最高压力变化趋势

Fig.6 Trend of maximum pressure

图 7 压缩机功率变化趋势

Fig.7 Trend of compressor power change

图 8 高温透平功率变化趋势

Fig.8 Trend of high temperature turbine power

图 9 低温透平功率变化趋势

Fig.9 Trend of low-temperature turbine power

图 10 循环效率变化趋势

Fig.10 Trends of cycle efficiency

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100 MW级联式S-CO₂循环动态特性研究

Study of Dynamic Characteristics of 100 MW Cascade S-CO₂ Cycle

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