demister

Selecting a demister (mist eliminator) depends primarily on the droplet size and the allowable pressure drop. For droplets larger than 10 microns, a Wire Mesh Demister is the standard due to its high surface area and efficiency. For larger droplets or high-fouling environments, a Vane Type (Chevron) Demister is preferred as it is less prone to clogging. Always specify the gas velocity, as exceeding the 're-entrainment velocity' will cause the captured liquid to be blown back into the gas stream.

Material selection must match the corrosivity of the process fluid. Common options include Stainless Steel 304/316L for general use, while Monel, Titanium, or Hastelloy are required for highly acidic environments. For lower temperature, corrosive applications, plastic options like PP, PVC, or PTFE are cost-effective. Ensure the supplier provides a Material Test Report (MTR) to verify the alloy composition.

A high-performance demister should achieve a removal efficiency of up to 99.9% for specific particle ranges. Key benchmarks include a low pressure drop (typically <250 Pa) to minimize energy costs and a high void volume (usually 97%–99%) to allow maximum gas throughput. For industrial scrubbers, verify that the demister meets ASME or equivalent international pressure vessel standards if integrated into a housing.

Mesh density (kg/m³) directly impacts the collection efficiency and the pressure drop. Higher density mesh captures smaller droplets but increases resistance to gas flow. It is vital to balance the surface area for impingement with the need for liquid drainage; if the mesh is too dense for the liquid load, 'flooding' will occur, significantly reducing performance.

The main risks include material substitution (using lower-grade steel) and dimensional inaccuracies. Since demisters must fit tightly within a vessel to prevent 'gas bypassing,' even a 5mm error in diameter can render the unit useless. We recommend using Made-in-China.com's inspection services to verify dimensions and material grades via PMI (Positive Material Identification) testing before shipment.

Demisters are rarely 'off-the-shelf' products. Negotiate for the inclusion of detailed CAD drawings and performance curve simulations in the contract. Demand a performance guarantee linked to specific operating conditions (flow rate, temperature, pressure). For bulk orders, request tiered pricing based on the total weight of the wire mesh used, as this is the primary cost driver.

Demister pads, especially those made of thin wire mesh or plastics, are susceptible to compression damage. Ensure the contract specifies reinforced wooden crate packaging with internal supports to prevent deforming. For sea freight, specify VCI (Vapor Corrosion Inhibitor) packaging for carbon steel or lower-grade stainless components to prevent 'sea salt corrosion' during the voyage.

Utilize Secured Trading services on Made-in-China.com to ensure payments are only released upon proof of shipment. Verify the supplier's ISO 9001 certification and check if the product requires specific HS Code classification (typically 8421.39) to accurately calculate import duties and VAT in your destination country.