Simulation study on dynamic characteristics of supercritical carbon dioxide/lead-bismuth coupled heat exchanger

NI Yike; LI Hongzhi; YANG Yu; ZHANG Yifan; WU Jiarong; WU Shuaishuai; HAN Yuhang

doi:10.19666/j.rlfd.202411236

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Simulation study on dynamic characteristics of supercritical carbon dioxide/lead-bismuth coupled heat exchanger

更新时间：2025-09-26

- Simulation study on dynamic characteristics of supercritical carbon dioxide/lead-bismuth coupled heat exchanger
- Thermal Power Generation Vol. 54, Issue 5, Pages: 82-91(2025)
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202411236
  CLC：
- Published：2025
- 稿件说明：
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NI Yike, LI Hongzhi, YANG Yu, et al. Simulation study on dynamic characteristics of supercritical carbon dioxide/lead-bismuth coupled heat exchanger[J]. Thermal power generation, 2025, 54(5): 82-91.
DOI：

NI Yike, LI Hongzhi, YANG Yu, et al. Simulation study on dynamic characteristics of supercritical carbon dioxide/lead-bismuth coupled heat exchanger[J]. Thermal power generation, 2025, 54(5): 82-91. DOI： 10.19666/j.rlfd.202411236.

摘要

为研究入口温度、流量阶跃变化对超临界二氧化碳（S-CO_2）/铅铋耦合换热器动态性能的影响，通过建立换热器分段模型开展了数值模拟工作，基于仿真结果建立并验证了传递函数模型，定量掌握入口阶跃扰动对冷侧出口温度的影响作用。结果表明：入口温度阶跃扰动下，换热器响应迅速但温度场变化幅度较小，热侧入口温度阶跃变化的时间常数为22.1s，当冷侧入口温度降低50 K时，换热器中点热侧温度仅从795.23 K降至793.17 K；流量阶跃扰动下，换热器响应滞后但温度场变化幅度更大，冷侧入口流量阶跃变化的时间常数为30.08 s，当冷侧流量增加至0.002 kg/s时，换热器中点热侧温度由795.23 K降至779.08 K。所建立传递函数的计算结果与分段模型模拟值吻合性较好，所得结论对于S-CO2动力循环与铅铋快堆耦合系统中间换热器的运行策略具有一定参考意义。

Abstract

To study the effect of inlet temperature and flow step changes on dynamic performance of supercritical carbon dioxide(S-CO_2)/lead-bismuth coupled heat exchanger

a segmental model was established for numerical simulations. Based on the simulation results

a transfer function model was developed and validated to quantitatively assess the effect of inlet step disturbances on the cold-side outlet temperature. The results show that

under inlet temperature step disturbances

the heat exchanger responds quickly

but the temperature field changes with a smaller amplitude. The time constant for the temperature step change at the hot-side inlet is 22.1 s. When the cold-side inlet temperature decreases by 50 K

the temperature at the midpoint of the heat exchanger only drops from 795.23 K to 793.17 K. Under flow step disturbances

the heat exchanger responds with a delay

but the temperature field changes with a larger amplitude. The time constant for the cold-side inlet flow step change is 30.08 s. When the cold-side flow increases to 0.002 kg/s

the temperature at the midpoint of the heat exchanger drops from 795.23 K to 779.08 K. The transfer function established in this study shows good agreement with the results from the segmental model. The findings provide useful insights for the operational strategy of intermediate heat exchangers in the S-CO2 power cycle and the lead-bismuth fast reactor coupling system.

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WU Jiarong

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LI Hongzhi

NI Yike

WANG Li North China Electric Power Research Institute(Xi'an) Co.

Related Institution

Xi'an Thermal Power Research Institute Co.Ltd.

华北电力科学研究院西安公司

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