Packed tower scrubbers (packed column or packed bed scrubbers) are designed for chemical scrubbing of contaminants from gas streams. Such scrubbers are versatile, reliable systems that serve the widest variety of processes. Packed tower scrubbers are highly recommended for the efficient removal of inorganic gases, odors, and fumes. These scrubber systems are particularly appropriate where gas streams have extreme pH.
The packed bed, that is often used in wet air scrubbers, is a hollow tube or pipe filled with a specifically designed packing material. It can be designed with structured packing or this packing can be filled with a small object such as Raschig rings. Packed bed may contain catalyst particles or adsorbents such as zeolite pellets, granular activated carbon, and suchlike. Packed bed were created to improve contact between two phases in a chemical or similar process. They can be used in a chemical reactor, a distillation process, or a scrubber, also beds have been used to store heat in chemical plants.
The packed bed scrubbers are designed to remove gaseous or vaporous pollutants from an air stream. The process is accomplished by contacting the contaminated air stream with a scrubbing liquor that absorbs or chemically reacts with the pollutants. The cleaned air is then discharged to the atmosphere and the contaminated scrubbing liquor is either disposed of in the approved can be recovered and reused in the original on other processes.
There are two types of packed bed scrubbers:
- Vertical Packed Bed Scrubbers
In the vertical counter-current design, gas flows upward while scrubbing liquid flows down through banks of sprays. The absorption of gases takes place in the scrubbers random packing section and scrubbing liquid is introduced into a liquid through or spray distribution system. A high-efficiency mist eliminator removes entrained liquids. Clean gas exists at the top of the vessel.
- Horizontal Packed Bed Scrubbers
In the horizontal design, gas flows horizontally while scrubbing liquid flows down through a liquid distribution system. The scrubber includes a random packing section where the absorption of gases occurs. A high-efficiency mist eliminator removes entrained liquids. An integral sump is located at the base of the packing section, eliminating the need for an external tank.
Packing beds perform with great efficiency in various types of wet air scrubbers as they assist in removing a wide range of chemicals and contaminants such as acids, toxic gases, fumes and odors in many industrial and municipal applications.
Some advantages of packed bed scrubbers include:
- the ability to perform operations in an atmosphere that is highly corrosive;
- high efficiencies of mass-transfer;
- low capital cost;
- small space requirements compared to other types of wet air scrubbers.
However, packed bed scrubbers do have certain disadvantages that potential customers need to keep in mind. Packed bed scrubbers are not ideal for particulate matter scrubbing, they are more adept to gas scrubbing. The bed may be clogged by high concentrations of particulate matter, and due to the nature of the packing bed, the access and cleaning are more difficult when compared to other scrubber systems. Therefore the use of packed bed scrubbers is limited to streams with low loadings of dust. Once clogged, the cleaning of the packed material is not only difficult, but also expensive.
Redwood technology is a fast-growing vendor of wet air scrubbers. The multi-vortex scrubber can remove gas emissions, dust, vapors, and other pollutants from a gas stream. It is an innovative technology created to save water that makes it more cost-efficient and differs from other types of scrubbers. If you have any questions or would like to purchase a multi-vortex wet air scrubber, please contact us at firstname.lastname@example.org