The Pall ring packing is a new kind of packing, which is improved for some major defects of the Raschig ring. It is an eight-layer rectangular small window on the wall of the ordinary Raschig ring. The small window blades are placed at the center of the ring. The upper and lower window positions are formed by overlapping each other. The main difference between it and the Raschig ring packing is that there are rectangular window holes on the side wall, and the window leaves of the window holes are bent into the center of the ring. The distribution of gas and liquid is larger than that of the Raschig ring due to the opening of the ring wall. Improvements, especially the internal surface area of the ring, can be fully utilized.
The Pall ring packing has the advantages of large flux, low resistance, high separation efficiency and large operational flexibility. Under the same pressure reduction, the treatment volume can be more than 50% larger than the Lacy ring. At the same throughput, the pressure drop can be reduced by half and the mass transfer efficiency can be increased by about 20%. Compared with the Raschig ring, this kind of packing has the characteristics of large production capacity, strong resistance and large operation flexibility. Under normal circumstances, the same pressure drop can be treated 50%-100% of the Rachel ring, and the pressure drop ratio is similarly treated. The West Ring is 50%-70% smaller, and the tower height is also depressurized. The Pall ring can be about 20%-40% of the packing volume of the Lacy ring.