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

doi:10.11930/j.issn.1004-9649.202310090

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202310090

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

Figures/Tables 11

References 25

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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

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

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

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