CIESC Journal ›› 2020, Vol. 71 ›› Issue (5): 2049-2060.DOI: 10.11949/0438-1157.20191351

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Study on dynamic and static performance of external tubular molten salt receiver

Mei XU(),Huaiwu PENG,Dongsheng NIU,Xiao WANG,Bin XIAO,Zhi ZHOU,Yanglong DUAN,Junfeng ZHANG   

  1. Powerchina Norhwest Engineering Corporation Limited, Xi’an 710000, Shaanxi, China
  • Received:2019-11-08 Revised:2020-03-13 Online:2020-05-05 Published:2020-05-05
  • Contact: Mei XU

外露管式熔盐吸热器动静态特性研究

徐玫(),彭怀午,牛东圣,王晓,肖斌,周治,段杨龙,张俊峰   

  1. 中国电建集团西北勘测设计研究院有限公司,陕西 西安 710000
  • 通讯作者: 徐玫
  • 作者简介:徐玫(1989—),女,硕士,工程师,920506307@qq.com

Abstract:

A 50 MW external tubular molten salt receiver model is developed for simulating the dynamic and static performance of the receiver in ideal conditions and actual meteorological conditions. The response curve is given to show that the maximum surface temperature, temperature gradient, and heat dissipation power of the receiver are basically proportional to the changes in direct normal irradiance (abbreviated as DNI); the efficiency grows with increase in direct normal irradiance, and the slope, however, decreases; wind speed mainly affects convection heat dissipation power; in the presence of direct normal irradiance step disturbance, the response time of the molten salt outlet temperature, the maximum surface temperature and the heat dissipation power of the receiver is longer than that of the receiver tube axial temperature gradient, and gradually the efficiency returns approximately to the level before a sudden change; flow step down have a greater impact on the receiver performance. Using the quantitative relationship between the characteristic parameters of the heat sink and the direct solar irradiance and molten salt flux can improve the molten salt flux adjustment strategy in operation.

Key words: solar energy, radiation, heat transfer, external tubular molten salt receiver, dynamic and static performance

摘要:

以某50 MW塔式光热发电项目外露管式熔盐吸热器为研究对象,进行了建模,通过理想条件下的动静态仿真和实际气象条件下的模拟,给出吸热器特性参数的动静态响应曲线,提出了吸热器出口盐温控制的改进方法,分析了其在实际气象条件下的运行特点,总结了以下规律:吸热器表面最高温度、温度梯度、散热功率与太阳法向直射辐照度的变化基本呈正比关系;效率随太阳法向直射辐照度增大而升高但斜率逐渐减小;风速主要影响对流散热功率;太阳法向直射辐照度扰动下吸热器出口熔盐温度、表面最高温度、散热功率的过渡过程响应时间较吸热管轴向温度梯度更长,效率在瞬间突变后会重新逐渐回复到接近扰动前的水平;流量阶跃下降对吸热器性能影响更大。利用吸热器特性参数与太阳法向直射辐照度和熔盐流量三者间的定量关系可改进运行中的熔盐流量调整策略。

关键词: 太阳能, 辐射, 传热, 外露管式熔盐吸热器, 动静态特性

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