Dry tray pressure drop of double weight float valve trays

摘要

This paper calculated the dry tray pressure drop of double weight float valve trays based on anew dry tray pressure drop model proposed by Wang. Firstly, pressure drop is related with thepositions of valves on the trays, and the opening process of double weight valves can be dividedinto 7 sections by 6 special points (ignoring the influence of light valve inclined state on pressuredrop). Secondly, gas velocities at every apparent balance point can be calculated as well as thefractions of float valve state in different gas velocity sections. Finally, dry tray pressure drop can beobtained via the physical model. A series of hydraulics experiments have been done on a large-scaleexperimental tower, and two types of float valve combination (32&58g and 32&80g) were studied.As the influence of light valve inclined state on pressure drop was ignored, the deviation caused bythis neglect was acceptable, however, the effect of heavy valve inclined state cannot be ignored andit will cause a relatively large positive deviation, which have been proved. The model calculatedvalues fit the experiment data very well.