Optimization Of Swirl-contacting Component With Tangential Entrance And Study On It's Hydrodynamics Characteristics

Chemical equipment with the needs of the community in the constantly upgrading,tower equipment is the main equipment in the petrochemical plant,the traditional tray has been gradually unable to meet the modern chemical industry high efficiency and low energy consumption needs,so that new tray research is inevitable.The main purpose of this paper is to study the performance and improvement direction of the new swirl gas-liquid contact separation tray,and to provide reference for the subsequent tray research.In the cyclone tower,the gas flows from bottom to top,the liquid flows from top to bottom,the gas tangentially enters the swirling element,and forms the high speed rotating flow field under the action of the guide and the reducing flow path of the blade.The liquid on the tray passes through the inlet pipe into the center low pressure zone of the rotating flow field and is sucked and crushed to form droplets.After mass and heat transfer with the gas,the liquid is driven by the centrifugal force which generated by the rotating air flow to the wall of the swirling element,and then thrown out,so as to the gas and the liquid achieve contact and separation process.In this paper,we changes the structure of the double-layer isolation of the tray as a single-layer liquid seal structure and shortens the swirl height of the swirling element.In this paper,a new design of the blade form of the cyclone components were simulated and analyzed,and some characteristics of the internal flow field of the cyclone element were obtained.The velocity field and the pressure field are symmetrical,and the tangential velocity,axial velocity and pressure drop distribution are hump-like,which is consistent with the actual situation.There is a low pressure zone in the central region of the swirling element,and the low pressure zone can provide power for the feed.Under the same operating conditions,the performance of the swirl element with different swirl height is compared and analyzed.It is found that the higher the swirl height is,the greater the tangential velocity is,the more unstable the flow field and the greater the pressure drop.Based on the simulation results,the experimental device is simplified and then machined out of the parts.After the completion of the experimental equipment,this paper analyzes the pressure drop,leakage condition,flooding condition and dry plate condition of the high speed tray with the swirl height L=318,288,258 mm.Dry plate pressure drop close to the simulation results,with the increase of gas flow rate,the dry plate pressure drop increases.When the pressure drop is analyzed,the critical phenomenon of the tray is found,that is,after reaching the mist entrainment gas volume,it will continue to increase the gas volume,after the fogging entrainment disappears after a certain amount of gas volume,and the pressure drop curve also appears a temporary decline,the critical phenomenon occurs when the gas-liquid two-phase contact state and separation are better than the fog entrainment before the normal operating conditions.Comparing the pressure drop curves of the three plates under the same operating conditions,it is found that the gas flow rate required for the critical phenomena increases with the increase of the swirl height.The operating conditions of the trays with the swirl height L=318,288,258 mm are determined by the F factor.The range of the normal working F factor of the plate with the swirl height L=318mm is 8.7~19.9 under the normal working condition and 49.7~56.6 under the critical condition;the range of the normal working F factor of the plate with the swirl height L=288mm is 8.7~19.9 in the normal working condition and 39.7~57.6 under the critical phenomenon;the range of the normal working factor of the plate with the swirl height L=258mm is 9.1~19.9 under normal operating conditions and 34.8~60.6 under the critical phenomenon.The operating range of the trays with the swirl height L=258mm in the conventional operating conditions is smaller than that of L=318,288 mm,but the operating range is wider under critical conditions.