Screen defoamer

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A wire mesh demister can achieve gas-liquid separation; when gas containing mist passes through the wire mesh, the mist collides with the fine wires of the mesh and gets attached to their surfaces. The diffusion of mist on the surface of the filament, along with the gravitational settling of the mist, causes the mist to form larger droplets that flow down the filament toward the junction of the two filaments. The wettability of the filament, the surface tension of the liquid, and the capillary action of the filament cause the droplets to grow larger and larger. Once the aggregated droplets become large enough such that the gravity they generate exceeds the combined force of the upward force exerted by the gas and the surface tension of the liquid, the droplets separate from the filament and fall downward, while the degassed gas is directed to the device below. Recently, I read the explanation on page 1011 of the \"Chemical Process Design Manual\" regarding foam breakers, and it seems different from what we used in previous containers. I would like everyone to discuss this matter. The book states that there should be a certain amount of space between the foam breaker and the top of the tank; however, the mesh screens we used were installed inside DN200 pipes, only 50 mm away from the tank’s top outlet (DN80). I’m not sure if this will affect their performance. The medium in question is petrochemical oil and gas. Another issue is that the oil and gas contain a significant amount of waxy substances, which might cause the mesh screens to get clogged after a short period of time, preventing gas from escaping.