两种能衡式蒸汽干度仪的研究

A Study of Two Types of Energy-balanced Steam Dryness-fraction Measuring Instrument

水蒸气干度是水蒸气的品质参数,在许多工业生产中需要实时测量与控制该参数。文中分析了现有蒸汽干度的测量方法和测量仪器,根据能量守恒原理以及混合式和凝结式蒸汽干度的测量原理,研制了两种能衡式干度测量仪,定量分析了它们的测量精度,并从实用稳定性的角度得出了凝结式蒸汽干度仪更佳。为了验证测量精度,建立了蒸汽干度实验台。实验不仅验证了能衡凝结式蒸汽干度仪的精度高达98%以上,而且还表明它具有稳定性、准确性和实用性。

The steam dryness fraction is a quality parameter of steam,which needs to be real-time measured and controlled in many industrial production processes.Analyzed are the current measuring methods and instruments of steam dryness-fraction.On the basis of energy conservation theory and measurement theory of hybrid and condensing type steam dryness-fraction,two types of energy-balanced steam dryness-fraction measuring meter have been developed.Furthermore,their measurement accuracy is quantitatively analyzed and from the viewpoint of practical stability the authors have concluded that the condensing type steam dryness-fraction meter is superior to the hybrid type.To verify measurement accuracy,a steam dryness-fraction test rig has been set up.The tests not only show that the energy-balanced condensing type meter has attained an accuracy higher than 98% but also indicate that it is stable,accurate and practical.