The Study On Performance Of The New Bubble-cap Tridimensional Sieve Tray

The paper introduce one newly developed tray:New bubble-cap tridimensional sieve tray (NBTS) which has the dual role of mass transfer of both Bubble Cap tray and Vertical Sieve Tray in on plate. The structural design of NBTS was based on the cold model experimental results of the bubble-cap tridimensional sieve tray, in addition, the device of hot model experiment and the measuring liquid lift-up measurement platform were designed that has provided a very convenient condition for further research.To investigate the hydrodynamic performance of NBTS various experiments were carried out using water-air system at different liquid and gas flow rates and structure parameters of NBTS. Compared with the results emanated from the experiment under the same condition with the bubble-cap tridimensional sieve tray. As a result, the dry tray pressure drop of NBTS is in directly square proportion to the kinetic energy factor in plate hole and in the optimal structure parameters, the total tray pressure drop and entrainment rate is increased with increasing kinetic energy factor in plate hole, liquid flow rate and weir height, with the increasing liquid flow rate and weir height the gas velocity at liquid weeping point is increased. Liquid lift-up increases at first and then decreases with increasing of the kinetic energy factor in plate hole, increases with the clear liquid height increasing. Compared with the hydrodynamic performance of the bubble-cap tridimensional sieve tray at the same condition, tray pressure drop was decreased about 8%, entrainment rate was about 10% lower at the high gas load, and the gas velocity at liquid weeping point was roughly equal. Based on the experimental date the correlative equation can be got for calculating tray pressure drop, entrainment rate and liquid lift-up, moreover, math models that described the mass transfer process of riser and outside cap were established, and equations of transfer efficiency were deduced based on the experimental date, that is expect to provide reference for practical application with the constant perfection in the further research.