What is Structured Packing and How it is used in Process Plant

 

In a Structured packing, material is arranged in a specific way to follow the mass transfer operation more efficiently. Structured packing is widely used in Distillation Column, Chemical reactors and absorption towers also. Thin corrugated metal plates consisting in it is designed to forcing and passing fluids through more disturbances on its way throughout the column. The design purpose` is intended to ultimately produce a large surface area for contact between different phases of fluids.







Variety of materials are being used in structured packing including corrugated sheets with perforated holes of metals, plastic and wire gauze also. After all the arrangement of sheets, the honeycomb shaped product is formed which is with inclined flow channels producing high surface area and also coupled with low gas flow resistance. More modifications and enhancements are done to maximize liquid spreading which are ideal for application with low pressure maintenance throughout the column.

How Structured Packing is Used in Process Plants

 

The Unique and Uniform arrangement of structured packing offers many advantages over other types of packing and trays. Such types are used in many wide applications where precise liquid spreading is needed. Several types of structured packing that can be used in process plants are as follows,

1.      Gauze/Wiremesh – This type of packing is mostly preferred for deep vacuum and low liquid rate applications. It offers lowest pressure drop per theoretical stage. Its specifications make it ideal choice for processing of specialty chemicals, Pharmaceuticals and for temperature sensitive materials.

 

2.      Knitted – This type of packing is used in smaller diameter columns by rolling into one-piece layer. It can also be wrapped back and forth to create rectangular bricks to be used in column manways. The multi-strand wires are used in this type which offers high surface area and high mass transfer efficiency at a higher-pressure drop than woven gauze.

 

3.      Sheet Metal – This type of packing can handle wider range of vapour and liquid rates and process services too. Process applications range varies from low-pressure drop vacuum and atmospheric distillation services to medium high-pressure absorbers. Sheet metal packing can even handle a modest amount of fouling with adequate liquid loading to keep the packing wetted. This special application separates it from other types of packing.

 

4.      Grid – This type can provide extended operation mostly in fouling services. Grid packing is nothing but the corrugated sheets with stamped blades. Both types are durable with large open areas to facilitate highly fouling process streams. Corrugated grid packing has a smooth surface to minimize fouling. This type of packing is constructed of much thicker material than the normal sheet metal packing.

Structured Packing vs Trays -

 

Packing trays are generally used when a column is experiencing a bottleneck issue. These trays are replaced with structured packing for three reasons:

1.      They provide extra inter-facial area for contact between vapor and liquid.

2.      To process corrosive liquids in a column.

3.      Structured packed columns are shorter in height than trayed columns.

4.      It offers better separation efficiency.

Structured packing is advantageous in applications that need constant contact, rather than the staged contact provided by trays.

 

Structured Packing vs Random Packing –

 

We’ve previously discussed the benefits of Random Packing. One such benefit is they are more cost efficient than structured packing and are less sensitive to misdistribution. However, structured packing tends to offer higher efficiency and capacity, as well as lower pressure drop than random packing. Structured packing also has a higher capacity and reduced liquid hold up compared to random packing and trays.

S-Cube Mass Transfer Pvt. Ltd. is the India’s leading Structured Packing manufacturer and exporter and expertise in complete turnkey solutions. Expertise in any kind of equipment and manufacturing custom solutions, including structured packing. Follow this guide to ensure you get maximum efficiency of your structured packing.

We are delivering patented technology for Distillation and Column Internals for your process.

For more information, please visit to website https://s3dist.in/


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