I always trouble with design the high liquid level/low liquid level for the liquid/vapor of vertical/horizontal drum and I know this kind problem is trivial and be asked many time in different manner.
Also, I couldn’t find any easy-to-use spreadsheet for this drum sizing probelm.
I read a paper which wrote the formula confused me.
The minimum permissible distance between LLL and bottom of drum- HLL
HLL =56 * Q^0.4 /(1 – gas density / liquid density)^0.2 ( for metric unit)
Is any pro can help me out how this formula come from? Thank you so much.
Note.1 The drum usually is the following:
- Liquid surge and distillated drum
- Lube oil separators for compressor discharge
- Steam drums in boiler service
- High pressure separators.
Step 1- choose which type drum fit in your design criteria.
(The vertical drum may have longer holding time compared to the horizontal drum)
Step 2- Base on the drum configuration you selected in step 1, and decide the
Drum with mesh screen or not.( cause the critical velocity may higher in drum with mesh than that with no mesh)
Step 3-Select the type of inlet nozzle for specific types of separator drums.
Note.2 Wire mesh screen (WMS):
WMS are porous blankets of wire or plastic knitted mesh,
Which are used for removing entrained liquid drops from a vapor stream? WMS installed internal for tower, drum, and fixed bed reactor. As vapor and entrained liquid drop pass WMS, the vapor moves freely through the mesh pad, but the drop cause of
Their greater inertia can’t follow the gas stream and collected on the mesh wire.