Flooding hydraulics characteristic of air-water two-phase flow was studied in a miniature plexiglass structured packing column with an inside diameter of 220mm.The experiment used domestic CY700 type of stainless steel gauze corrugated packing and the differential pressure signal of the metal gauze corrugated packing layer was acquired by EJA120A miniature differential pressure transmitter at room temperature and atmospheric pressure.Distribution characteristics of the packing layer pressure was analyzed during different operation stages in the structured column.Fluctuation of the packing layer pressure showed normal distribution with distinctive feature in different experiment operation stages and a fluctuation degree of the pressure signal with standard deviationat was further studied at different spray densities in the packing column.There was a distinct difference between pre-flooding and post-flooding.The power spectral density characteristics of the packing layer pressure were obtained through the analysis of the pressure signals at different operation stages.The pressure signal power at the flooding stage was greater than at the loading liquid stage

and the pressure signal power at the normal operation stage was the minimum.Control of the differential pressure distribution characteristics signal at real-time monitoring could adjust the operation state of the packing columns in real time to predict and avoid the occurrence of flooding

improve operation performance and economic efficiency of the packing columns to realize energy saving and emission reduction.