Influence of steam wetness on steam flow rate measurement using ultrasonic flow meter

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  • MORITA Ryo
    Central Research Institute of Electric Power Industry
  • INADA Fumio
    Central Research Institute of Electric Power Industry
  • UCHIYAMA Yuta
    Central Research Institute of Electric Power Industry
  • UMEZAWA Shuichi
    Tokyo Electric Power Company Holdings
  • ISHIBASHI Masahiro
    National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology
  • FUNAKI Tatsuya
    National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology

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Other Title
  • 超音波流量計を用いた蒸気流量計測における蒸気湿り度の影響

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<p>In industrial fields, as the steam is commonly utilized for heat supply, drying process and so on, it is important to be aware of the steam flow rate in the view point of energy management. However, the steam utilized in the factory is usually wet steam condition. Though it is well known that the wetness affects the flowmeter reading, it is difficult to clarify the effects of the wetness in the steam flow quantitatively in actual plants and factories, and thus far, there has been no established method for estimating the error caused by the wetness of steam flow. In this paper, the difference of ultrasonic flowmeter reading due to wetness of the wet steam flow was clarified experimentally. Ultrasonic flowmeter reading in the wet steam flow was compared with Coriolis flow meter installed after heat exchanger in the steam apparatus. As a result, we clarified the flow rate difference of those two flowmeters was increased with increasing wetness, and the ultrasonic flowmeter reading was almost the same as the value of steam phase flow rate in the wet steam flow. We also proposed the correction method of the ultrasonic flowmeter reading by using density correction in the flow rate formula of the ultrasonic flowmeter. And finally, we clarified the uncertainty of the measured flowrates and their differences were less than 1.0%.</p>

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