| 引用本文: | 余 丹,杨世伟,陈俊光,等.混合式抽水蓄能电站对下泄水温影响的数值模拟研究[J].灌溉排水学报,2024,43(9):75-81. |
| YU Dan,YANG Shiwei,CHEN Junguang,et al.混合式抽水蓄能电站对下泄水温影响的数值模拟研究[J].灌溉排水学报,2024,43(9):75-81. |
|
| 摘要: |
| 【目的】混合式抽水蓄能电站运行特性与常规电站相比存在差异，本文旨在掌握抽水蓄能电站水温的变化规律，为水库管理调度提供参考。【方法】以紧水滩水库为研究对象，采用MIKE3水温模型模拟不同进/出水口高程以及不同抽水流量工况的下泄水温，据此探讨混合式抽水蓄能电站对下泄水温的影响。【结果】抽蓄水流会对下泄水温产生影响，相对于现状无抽水工况的下泄水温，抽蓄工况下的下泄水温基本表现为5—9月略有下降，其余月份略有升高，下泄水温的最大降幅不超过0.7 ℃，最大升幅不超过0.8 ℃。【结论】进/出水口高程对于下泄水温影响较大，且高程越低，下泄水温差异越大。然而抽水流量对于下泄水温差异影响并不显著，但整体上也呈现出随着抽水流量增加，水温差异增大的趋势。 |
| 关键词: 抽水蓄能电站；下泄水温；进/出水口高程；抽水流量；数值模拟 |
| DOI：10.13522/j.cnki.ggps.2023505 |
| 分类号: |
| 基金项目: |
|
| Numerical study on the influence of hybrid pumped-storage power station on outflow water temperature |
|
YU Dan, YANG Shiwei, CHEN Junguang, LIANG Ruifeng
|
|
1. Xianning Vocational Technical College, Xianning 437100, China;
2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
|
| Abstract: |
| 【Background and Objective】As renewable energy is expanding, complementary energy storage solutions such as pumped-storage power stations have been developed. By the end of 2020, the total installed capacity of pumped-storage power stations in China had surpassed 30 million kW. Differing from conventional hydropower stations, pumped-storage power stations operate under distinct thermal and dynamic conditions, which can affect the environment as the temperature of water discharged from these reservoirs is closely linked to river ecosystems. Low-temperature discharges not only delay or prevent fish spawning, but also adversely affect crop growth, leading to crop yield reduction. Despite these concerns, research on the change in outflow water temperature of hybrid pumped-storage power stations is limited. This paper is to bridge this knowledge gap. 【Method】Taking the Jinshuitan Reservoir as an example, we simulate outflow water temperature under different inlet-outlet elevations and pumping rates using used the MIKE3 water temperature model. This allowed us to assess the impact of hybrid pumped-storage hydropower stations on outflow water temperature.【Result】Compared to the outflow water temperature without pumping and storage, pumping-storage reduced the outflow water temperature from May to September and increased it during the other month; the maximum decrease and increase in temperature were less than 0.7 ℃ and 0.8 ℃, respectively. Specifically, at a pumping rate of 110 m3/s, raising the outlet elevation from 130 m to 150 m led to the reduction in the outflow water temperature to decrease from 0.4 ℃ to 0.1 ℃ between May and October, and the rise in temperature to decrease from 0.5 ℃ to 0.02 ℃ during the remaining months, compared to conditions without pumping-storage. When the outlet elevation was maintained at 139 m, increasing the pumping rate from 50 m3/s to 70 m3/s only affected decrease in the outflow water temperature between May and September, with the decrease increasing from 0.1 ℃ to 0.2 ℃. Further increases in the pumping rate, while keeping the outlet elevation at 139 m, had no significant impact on the outflow water temperature.【Conclusion】The elevation of the inlet and outlet significantly affects the outflow water temperature; a lower elevation results in a greater temperature difference. While the pumping rate does influence the temperature difference, the effect is less pronounced, though the temperature difference does increase with pumping rates. To minimize the adverse impacts of pumped-storage operation on downstream ecosystems, it is advisable to position the inlet and outlet at the highest feasible elevations. |
| Key words: pumped storage power plants; discharge water temperature; inlet/outlet elevation; pumping flow rate; numerical simulation |
