In chemical process plants, outlet gases from various liquid/gas contacting devices such as evaporation towers and distillation columns often contain entrained liquids in the form of droplets. These entrained liquid droplets needs to be removed to prevent affecting the quality of gas required for the downstream processes.
The mesh type demister pad is a highly efficient solution for liquid/gas separation, using metal wire woven into a flat or round wire mesh sheet to form a separating layer to remove entrained liquids, or to recover expensive impurities from the gases.
Features:
- Special design
- High demisting efficiency
- Simple structure
- High porosity
- Low pressure drop
- Light weight
- Easy installation and maintenance
- Up to 99% efficiency for droplets larger than 1μm
Mechanism
As the fine liquid droplets entrained in the gases passes through the demister mesh pad, the droplets hit the wire meshes, adhering to the surface of the wires. As more droplets attach to the surface of the wires, the coalesced droplets increases in size and eventually falls down due to gravity, completing the separation process.
Demister Screen Pressure Drop
As demister mesh screens have low pressure drop (typically <25mmH2O), the pressure drop is usually negligible.
Applications
- Petroleum refining
- Petrochemical industry
- Sugar industry
- Chemical industry
- Salt production
- Power generation
- Paper production
- Electronics
- Other various synthetic chemical industries
Demisters are commonly installed in the following equipments:
- Vacuum tower
- Absorber
- Knock-out drums
- Gas separator vessels
- Compressor suction drums
- Evaporators
- Scrubbers
- Distillation column
- Concentration vessels
- Dust collectors
- EMI shielding products
- Cushioning equipment
