1. Reducing pressure drop: Metal stepped rings have large gaps and flux in the path of gas-liquid flow, which can reduce pressure drop. 2. Increasing the capacity of the reaction tower: The increase in the capacity of the reaction tower is the direct reason for the decrease in pressure drop. The metal step ring keeps the reaction contact away from the pressure drop contact with overflow phenomenon, which means it can handle more gas-liquid and increase the capacity of the reaction tower. 3. Enhanced anti fouling ability: The pointing position of the metal step ring enables the gap in the direction of gas-liquid flow to reach a value, so any solid masonry can pass through the packing layer with the gas-liquid flow. 4. Improving reaction efficiency: The metal step ring limits its ring surface to be vertical rather than parallel, and this design has more prominent advantages in mass transfer. Because the reaction efficiency depends on the size of the contact surface. The design of parallel surfaces will prevent the inner side of the ring from coming into contact with liquid. A packed tower is a type of tower equipment. Fill the tower with appropriate height of packing to increase the contact surface between the two fluids. For example, when applied to gas absorption, the liquid enters through the distributor at the top of the tower and descends along the surface of the packing. The gas flows upstream from the lower part of the tower through the pores of the packing, and interacts closely with the liquid. The structure is relatively simple and maintenance is convenient. Widely used in gas absorption, distillation, extraction and other operations. Gas is sent from the bottom of the tower, distributed through a gas distribution device (small diameter towers generally do not have gas distribution devices), and then continuously flows against the liquid through the gaps in the packing layer. On the surface of the packing, the gas-liquid two phases are in close contact for mass transfer. A packed tower belongs to a continuous contact gas-liquid mass transfer equipment, and the composition of the two phases changes continuously along the tower height. Under normal operating conditions, the gas phase is a continuous phase and the liquid phase is a dispersed phase. The main purpose is to support the packing inside the tower, while also allowing the smooth passage of gas-liquid two-phase flow. If not designed properly, the liquid flooding of the packed tower may first occur on the packing support device. The structure of the stepped ring packing is similar to that of the Ball ring packing, with rectangular small holes on the ring wall and two layers of cross shaped blades staggered at 45 ° inside the ring. The height of the ring is half of the diameter, and one end of the ring is a flared edge. This structure improves the performance of the stepped ring packing on the basis of the Bauer ring, increasing its production capacity by about 10% and reducing pressure drop by 25%. Moreover, due to the multi-point contact between the packing, the bed layer is uniform, effectively avoiding the phenomenon of channel flow. Stepped rings are generally made of plastic and metal, and have been widely used due to their superior performance compared to fillers with holes on other sidewalls.