基于环境风温-冷却水温耦合计算的间接空冷塔冬季运行及防冻研究

康卫东; 李高潮; 王子豪; 王永进; 张利; 师进文; 韩立

doi:10.14135/j.cnki.1006-3080.20220601001

基于环境风温-冷却水温耦合计算的间接空冷塔冬季运行及防冻研究

doi: 10.14135/j.cnki.1006-3080.20220601001

康卫东^1,,
李高潮²,
王子豪³,
王永进⁴,
张利¹,
师进文^3, ,,
韩立⁵

1.
神华国能宁夏鸳鸯湖发电有限公司, 银川 750411
2.
西安热工研究院有限公司, 西安 710054
3.
西安交通大学动力工程多相流国家重点实验室, 西安 710049
4.
国家电投集团山西铝业有限公司, 山西, 忻州 034100
5.
西安西热节能技术有限公司, 西安 710054

基金项目: 国家重点研发计划项目（2019YFB1505403）

详细信息

作者简介:
康卫东（1974-），男，陕西宝鸡人，本科，工程师，主要研究方向为火电机组运行和生产管理。E-mail: 17001590@chnenergy.com.cn

通讯作者:
师进文，E-mail：jinwen_shi@mail.xjtu.edu.cn

中图分类号: TK121
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-01
- 网络出版日期: 2022-08-31

Winter Operation and Anti-Freezing Research of Indirect Air-Cooling Tower Based on Coupling Calculation Between Ambient Wind Temperature and Cooling Water Temperature

1.
Shenhua Guoneng Ningxia Yuanyang Lake Power Generation Co. Ltd, Yinchuan 750411, China
2.
Xi’an Thermal Power Research Institute Co. Ltd, Xi’an 710054, China
3.
State Key Laboratory of Multiphase Flow in Power Engineering of Xi’an Jiaotong University, Xi’an 710049, China
4.
SPIC Shanxi Aluminium Co. Ltd, Xinzhou 034100, China
5.
Xi'an TPRI Energy Conservation Technology Co. Ltd, Xi’an 710054, China

摘要

摘要: 间接空冷塔是空冷发电机组的重要冷端设备，其换热性能直接影响着整个发电机组的运行情况。本文针对宁夏某电厂的双间接空冷塔系统，在Fluent软件中通过使用用户自定义函数（UDF）对其进行了环境风温-冷却水温的实时耦合计算，进而对其在冬季大风条件下的冻结风险进行了研究。结果表明：耦合计算模型具有较好的精度，与各项实测数据相比误差均在5%以内。环境侧风会增加各扇段出口水温的不均匀度，主要表现为迎风扇段出口水温急剧降低。减小迎风扇段的百叶窗开度可提升其冷却水出口温度，但同时会使背风扇段出口水温骤降。当同时减小迎风与背风扇段百叶窗开度时，各扇段出口水温回升且分布更加均匀，整塔冻结风险普遍降低。
- 间接空冷塔 /
- 环境侧风 /
- 冷却水温 /
- 实时耦合计算
Abstract: Because of the advantage of saving water resources, the indirect air-cooling tower has been widely used in thermal power generating units in north China. Indirect air-cooling tower is an important cold side equipment of air-cooling generator unit. Its heat transfer performance directly affects the operation of the whole generator unit. Therefore, it is important to study the factors affecting the heat transfer performance of indirect air-cooling tower, especially the ambient crosswind, which has the greatest influence on its performance. In this research, by using user-defined function (UDF) to calculate the real-time coupling of ambient wind temperature and cooling water temperature, the dual-indirect air-cooling tower system of a Ningxia power plant was simulated in Fluent software. Then the freezing risk of the system was researched under strong wind conditions in winter. The results show that the coupling calculation model has superior accuracy and the error is less than 5% compared with the measured data. Ambient crosswind will increase the unevenness of outlet water temperature of each sector, which is mainly manifested as the sharp decrease of outlet water temperature in windward sectors. Reducing the shutters’ opening of the windward sectors can increase the cooling water outlet temperature, but at the same time, the water temperature of the outlet in the leeward sectors will drop sharply. When the shutters’ opening of windward and leeward sectors are reduced in the meantime, the outlet water temperature of each sector rises and distributes more evenly, and the freezing risk of the whole tower is generally reduced.
- Indirect air-cooling tower /
- Ambient crosswind /
- Cooling water temperature /
- Real-time coupling calculation

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图 1 间冷塔几何参数示意图

Figure 1. Geometrical parameters of indirect air-cooling tower

下载: 全尺寸图片幻灯片

图 2 翅片管束最小重复单元计算域及网格

Figure 2. Computational area and mesh of the smallest repeating unit of finned bundle

下载: 全尺寸图片幻灯片

图 3 耦合计算UDF逻辑图

Figure 3. Logic diagram of the UDF of coupled calculation

下载: 全尺寸图片幻灯片

图 4 网格无关性验证结果图

Figure 4. Mesh independence verification result diagram

下载: 全尺寸图片幻灯片

图 5 双塔温度及流场图

Figure 5. Temperature and flow field contour of twin tower

下载: 全尺寸图片幻灯片

图 6 双塔压强及流场图

Figure 6. Pressure and flow field contour of twin tower

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图 7 双塔冷却水出口温度分布图

Figure 7. Cooling water outlet temperature distribution of twin tower

下载: 全尺寸图片幻灯片

图 8 调整迎风扇段百叶窗开度后各扇段出口水温

Figure 8. Outlet water temperature of each sector after adjusting the shutter opening degree of windward sectors

下载: 全尺寸图片幻灯片

图 9 按表2方案调节百叶窗开度后各扇段出口水温

Figure 9. Outlet water temperature of each sector after adjusting shutter opening according to Table 2

下载: 全尺寸图片幻灯片

表 1 标准参数与模拟计算结果对比

Table 1. Comparison between standard parameters and simulation results

Item	Heat transfer/ MW	Draught/ Pa	Air mass flow/ kg·s⁻¹	Outlet air velocity/ m·s⁻¹	Outlet water temperature/ ℃	Air temperature in tower/ ℃
Standard values	1200.6	139	59708	6.2	32.5	38.8
Calculated values	1206.2	137	60385	5.9	32.4	40.0
Errors/%	0.04%	1.4%	1.1%	4.8%	0.3%	3.1%

下载: 导出CSV

表 2 各扇段百叶窗开度调节方案

Table 2. Adjustment scheme to shutter opening of each sector

Sector type	Serial number	Opening degree/%
Windward	11 12 1	10
Leeward	5 6 7	10
Side	2 4 8 10	20
Side	3 9	100

下载: 导出CSV

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