Handling throughput increase situations
Two options to handle throughput increase beyond existing KO drum capacity are:
1 Substitute a larger vessel to accept greater cross sectional area ME, sized to handle the increased throughput. This reduces gas velocity sufficiently to make the ME and KOD effective.
2 Retain the same KOD, with substituted latest technology high efficiency ME, sized to handle the increased throughput in place of the existing ME. Option 2, not requiring long downtime and expensive new vessel, is the cost effective and versatile approach. Given below are KOD capacity increase retrofit techniques. Use one or more as necessary:
1 Replace vertical ME elements with horizontal flow K = 0.13 m/s mesh pads and or K = 0.2 m/s vane units
Install properly engineered velocity, even profiling baffles
Install horizontal K = 0.12 m/s mesh pads with drainage layers or multiple zones; 10 to 12% capacity increase is easy.
4 Vendors offered Double-Pocket Vanes that can double the capacity of a conventional vane unit (K = 0.24 m/s to 0.34 m/s)
Install K = 0.15 m/s to 0.2 m/s Mesh-vane combinations; 10 to 25% efficiency and capacity increase are easy.
Install agglomerating Mesh and upstream 99.9% of 2-micron droplets efficient Double-Pocket Vanes; considerable capacity increase is easy.
7 Two or four banks ME configurations increase flow cross sectional areas; hence the new efficiency and capacity increases are astounding.
Figure 13 illustrates several of these possibilities: horizontal flow through vertical mist eliminator elements, using mesh pads to agglomerate fine mist into large droplets that vane units remove easily, and a double-bank configuration. Vendors’ design specialists help is available for optimal KOD capacity, performance and efficiency increase.