How To Choose The Right Packing Filter Products?

Recently, the sales department often received a call from customer to inquire about how to select the packing filters. For example, the random packing used in past wants to change the structured packing but don't know what material, type to choose to keep the high effeciency, or they found the effect of packing filters is not very goods after the inspection, and wants to change filters with better effects. As a munufacture specializing in the tower packing filters for 21 years, we are not only manufacturing, we are more willing to solve some practical problems for customer, so we need to produce the packings to meet the production requirements of process, and low costs in equipments and operating. So, how can we choose the most cost-effective filter?
 

First: the choice of tower packing type

1. Mass transfer efficiency should be high. In general, the mass transfer efficiency of structured packing is higher than random packing;

2. Large flux. Based on the high mass transfer efficiency, filters with higher general gas velocity or gas phase kinetic energy factor should be selected;

3. Lower pressure drop;

4. Strong anti-pollution performance, easy to disassemble and repair.
 

Second: the choice of tower packing specification

There are many specifications for the conventional structured packing. It is customary to use specific surface area, such as 125, 250, 350, 500, 700, 750, 1000, etc. The same type of structured packing , larger specific surface area will have higher mass transfer efficiency. The higher the efficiency, but the increase in resistance, the decrease in flux, and the increase in filler costs.
The model suffixes are represented by X, Y and Z, respectively, and the inclination of the corrugation to the tower axis is 30°, 45°, 60°, and the like. The smaller the inclination of the tower axis, the lower the resistance, but the mass transfer efficiency also drops significantly.
The selection should be based on separation requirements, flux requirements, site conditions, material properties, equipment investment, operating costs, etc., so that the selected filler can meet technical requirements and economic rationality.
 

Third: the choice of tower packing material
The material of the packing is divided into three categories: ceramic, metal and plastic.
(1) Ceramic packings
Ceramic packings have good corrosion resistance and heat resistance. Ceramic packings are inexpensive, have good surface wetting properties, but they are brittle. It is widely used in gas absorption, gas washing, liquid extraction and the like.

(2) Plastic packings
The material of the plastic packing mainly includes polypropylene (PP), polyethylene (PE) and polyvinyl chloride (PVC), etc., and polypropylene is generally used in China. The plastic packing has good corrosion resistance and is resistant to corrosion by general inorganic acids, alkalis and organic solvents. It has good temperature resistance and can be used at temperatures below 100 °C for a long time.
The plastic packing is light in weight, low in cost, good in toughness, impact resistant and non-fragile, and can be made into a thin wall structure. Its large flux and reduced pressure are used in absorption, desorption, extraction, dust removal and other devices.
A disadvantage of plastic packings is their poor surface wetting properties, but their surface wetting properties can be improved by proper surface treatment.
 

(3) Metal packings
Metal packings can be made from a variety of materials, primarily considering corrosion issues.
Carbon steel fillers are low in cost and have good surface wetting properties, and should be used with priority for non-corrosive or low corrosive systems.
Stainless steel fillers are highly resistant to corrosion and generally resistant to corrosion by common systems other than Cl-, but they are expensive and have poor surface wetting properties. In some special occasions (such as decompression concentrate at very low spray density in Distillation process), the surface needs to be treated in order to achieve good results.
Fillers made of titanium, special alloy steel and other materials are expensive and generally only used under some highly corrosive systems.

In general, the metal filler can be made into a thin-walled structure, which has large flux, low gas resistance, high impact resistance, can be used under high temperature, high pressure and high impact strength, and has the widest application range.