Inlet nozzle horizontal separator

Vertical blowdown drum/catch tank This type of drum, shown in Fig. 23-51, performs the same function and operates on similar princi-les as horizontal separators. These separators are usually used where orizontal space is limited. The two-phase mixture enters the vessel via a nozzle on the vertical shell and is distributed by an inlet baffle chamber. 

The dimensions of both vertical and horizontal separators are based on rules designed to provide adequate liquid holdup and vapor disengaging space. For instance, the desired vapor space in a vertical separator is at least 1 times the diameter, with 6 inches as the minimum above the top of the inlet nozzle. In addition, a 6-inch minimum is required between the maximum liquid level and the bottom of the inlet nozzle. For a horizontal separator, the minimum vapor space is equal to 20 percent of the diameter or 12 inches. 

For a relief KO drum, the horizontal separator is popular simply because of the use of split flow. In this design, one inlet nozzle is used at the vessel center with two outlets on either side. This split-flow advantage is available only in horizontal separators. 

A typical horizontal three-phase separator with flooded weir is shown in Figure 3.4. The inlet nozzle (Nl) and the gas outlet nozzles (N2) are placed as close as possible to the vessel tangent line. The distance of tiie nozzle center line and the tan line is dictated by tiie mechanical limitations of the vessel however, distances in Table 3.7 can be used for initial design. 

Different zones can also be defined in combination with distributor plates, as depicted in Fig. 7.38. Such a horizontal fluidized bed unit has an extended rectangular design of the process chamber The gas distributor usually has a transport effect, moving the solids from the inlet to the outlet in continuous operation. Segmentation is performed by subdivision of the plenum and by the placement, or not, of nozzles. Since each of the different compartments of the plenum can be equipped with a separate gas supply, it is possible to conduct various sequences of processing steps. For example, a product can be granulated in the first and second segments, dried in the third, and cooled in the final fourth section (Fig. 7.38). 

---