Definition
Random packing is a type of granular body with a certain geometry and size, generally stacked in a random manner in the tower, also known as random packing or granular packing. Random packing has been used for many years in fractionation, absorption, and steam stripping operations in natural gas, refineries, and chemical plants, with significant benefits. In addition, for some installations with severe contamination or corrosion, the packing needs to be replaced frequently. Random packing is ideal for these units because it is easy to store and replace.
Type
According to the material, random packing is divided into metal random packing, ceramic random packing and plastic random packing.
Metal random packing
Ceramic random packing
Plastic random packing
According to the shape, random packing is divided into ring packing, saddle packing and ball packing.
Random packing – pall ring
Random packing – cascade mini ring
Random packing – saddle ring
Random packing – supper saddle ring
Random packing – tri-pack
Random packing – polyhedral hollow ball
Metal Random Packing Oiling
There is a thin oil layer on the surface of the new metal random packing, which may be formed by the lubricating oil used in the processing of metal random packing; it may also be the anti-rust oil added to avoid corrosion of carbon steel random packing in the process of transportation and storage. The existence of this oil layer is not allowed for some systems. For example, in an air separation system, the oil layer washed down with liquid oxygen coexistence can cause an explosion. For the aqueous solution system, this layer of oil can prevent the formation of liquid film, for some alkaline systems can also cause solution foaming, so the applications of the oil should be clarified. If oil needs to be removed, remove it before the equipment starts. In order to facilitate the removal of the oil layer, the random packing lubricant is better to use water-soluble. However, carbon steel random packing should be stored in a dry and closed place, and should not be removed in advance to prevent rusting.
Ceramic Random Packing Debris Removal
New ceramic random packing and refilled ceramic random packing should be sieved off the debris in it, sometimes it needs to be removed by hand one by one, the bulk ceramic random packing is inevitably broken during transportation, the large pieces of broken ceramic random packing can still be used, its flux has decreased, the pressure drop has increased, but the separation efficiency will not decrease.
Random Packing Support Plate Installation
Wet Packing
Ceramic random packing and non-carbon steel metal random packing, if conditions allow, should use the wet packing method. Using wet packing, after installing the support plate, and filling the tower with water, the random packing from the water surface above gently pour into the water, the random packing from the water floating down, the water surface should be higher than the random packing more than 1 m. Wet packing can reduce packing breakage and deformation. Wet packing also increases the uniformity of random packing, the amount of random packing is reduced by about 5%, the filler flux is increased and the pressure drop is reduced. Therefore, wet packing should be used as much as possible in the case of restricted flux.
Dry Packing
The use of dry packing should always be poured from a certain height from the packing layer, for large diameter towers using dry packing, sometimes need to stand on the packing layer filling. The need to pay attention to people who can not stand directly on random packing, to prevent the random packing pressure deformation and uneven density, can be laid on the random packing board so that the force is disperse.
