Research And Improvement On The Structure Of New Vertical Sieve Tray

The thesis studies the structure and property of new vertical sieve tray's cap combining it's scientific researching production according to the developing state of today's column of tray . The author mainly works on the following contents:The thesis proposes three kinds of capicap of inverse basin tip,cap of flat tip,cap of inverse taper .Also the author conducts hydrodynamics test of the three cap and gains parameter related equation of their pressure drop, liquid entrainment rate and the quantity of leaking liquid.. The cap of excellent property is selected by comparing the hydrodynamics of the three kinds of new cap and the traditional standard cap.The experiment shows that the effect of liquid speed towards liquid entrainment rate is that liquid entrainment rate increase at first and decrease later accompanying the increasing of liquid speed. On normal operating states, liquid entrainment rate have a peak value, the transition point from the state of intense spray to ordinary spray.The experiment further studies the effect of other related factors and gain the following results: the smaller the distance, the more intense of spray extent and the bigger of liquid entrainment rate; the bigger of placket rate, the smaller of tray's pressure drop and liquid entrainment rate.Also, the author studied the effect of the change of liquid density towards the hydrodynamics property and gets the results that the higher the liquid density the higher of the tray pressure drop and the smaller of the liquid entrainment rate, the more of the quantity of leaking liquid.