A novel fouling measurement system: Part II. Commissioning
A novel fouling measurement system: Part II. Commissioning
复制标题
新型污垢测量系统：第二部分。
DOI：
10.1016/j.ijheatmasstransfer.2017.03.025
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发表时间：
2017-07
影响因子：
5.2
通讯作者：
Wang Xinlei
中科院分区：
文献类型：
--
作者：
Shen Chao;Wang Lin;Ford Steven E;Zhang Cancan;Wang Xinlei
污垢测量系统（FMS）通过测量传热管在长期运行过程中污垢阻力的变化，研究污垢存款与流速、水质和管形等运行条件的关系。本系列的第一部分提供了新开发的FMS的描述和设计评估。本系列的第二部分描述了FMS的调试，并记录了整个系统的性能和九个相同类型的增强管的主要污垢测试。系统调试结果表明，FMS达到稳态需要128 min。流速可分别控制在0.9m/s、0.16m/s和0.24m/s三个流速范围内，满足实验要求。在0.99 m/s的流速下，饱和温度可在34.0-35.5 °C范围内调节，相应的热流密度可在20.1 ~ 26.5 kW/m2之间变化。电导率（EC）的上升速率为130 μs/cm/d。冷却水的所有参数都控制在要求的范围内，除了钙硬度为480-860 ppm，远高于上限391 ppm。60 d后，污垢热阻在平均值0.4864 m2 K/kW附近增加了12.48%，达到0.3865-0.5078 m2 K/kW。以0.99m/s的速度连续运行60 d后，水侧压降由清洁状态的4.34- 4.62kPa下降到污染状态的2.90- 3.10kPa。
The Fouling Measurement System (FMS) supports research on the relationships between fouling deposit and operation condition involving water velocity, water quality and tube geometry by measuring variation of fouling resistance on a heat transfer tube during long-term running. Part I of this series provides the description and design evaluation of the newly developed FMS. Part II of this series describes FMS commissioning and documents the entire system performance and primary fouling test with nine same type enhanced tubes. Results of system commissioning demonstrated that the FMS would take 128 min to reach steady-state. Water velocity could be controlled at three velocities of ∼0.9 m/s, ∼1.6 m/s and ∼2.4 m/s respectively to satisfy the experiment requirement. Saturation temperature can be adjusted in the range of ∼34.0–35.5 °C at water velocity of 0.99 m/s, as a result, the heat flux varied from ∼20.1 kW/m2to 26.5 kW/m2correspondingly. The rising rate of electrical conductivity (EC) was 130 μs/cm per day. All the parameters of the cooling water were controlled at the required range, except calcium hardness, which is 480–860 ppm and much higher than the upper limit of 391 ppm. The fouling resistances increased to 0.3865–0.5078 m2K/kW after 60 days at an amplitude of 12.48% around the averaged value of 0.4864 m2K/kW. The water-side pressure drop decreased from 4.34–4.62 kPa at clean condition to 2.90–3.10 kPa at fouled condition after 60-day continuous running at ∼0.99 m/s.
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DOI：
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发表时间：
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影响因子：
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