We stated that the top edge of the outlet weir is maintained about 0.5 in above the bottom edge of the inlet downcomer to prevent…
Category: Tray
All vendors now market a high capacity tray. These trays have a 5 to 15 percent capacity advantage over conventional trays. Basically, the idea behind…
The problem we have been discussing—loss of tray efficiency due to low vapor velocity—is commonly called turndown. It is the opposite of flooding, which is…
The first continuous distillation tower built was the “patent still” used in Britain to produce Scotch whiskey, in 1835. The patent still is to this…
When trays weep, efficiency may not be significantly reduced. After all, the dripping liquid will still come into good contact with the upflowing vapor. But…
A distillation tray works efficiently when the vapor and liquid come into intimate contact on the tray deck. To this end, the liquid should flow…
One of the most frequent causes of flooding is the use of carbon steel trays. Especially when the valve caps are also carbon steel, the…
Figure 3.8 is a realistic picture of what we would see if our towers were made of glass. In addition to the downcomers and tray…
To summarize, the total height of clear liquid in the downcomer is the sum of four factors: • Liquid escape velocity from the downcomer onto…
We have yet to discuss the most important factor in determining the height of liquid in the downcomer. This is the pressure drop of the…