KO Drum inlet diffusers
Designers often neglect details while designing KO drum inlet; consequently drums perform poorly. Fig. 15 depicts an example.
The half-pipe inlet deflector penetrating into the vessel causes below following problems:
1 Gas jets to the vessel back wall. 2 Consequently, due to inadequate space to diffuse the jet, liq-
uid carrying gas flows through ME portions only. In addition, velocity profile is uneven; hence, ME efficacy decreases and ME escaping liquid entry into the compressor damages it.
3 The bottom directed gas jet agitates the liquid collected at the vessel bottom. Hence, the gas flowing upward towards the ME finds it difficult to remove droplets, which escapes the ME and damages the compressor.
4 Consequent turbulence prevents the large liquid particles’ gravity settling; the resulting additional liquid load on the ME could flood it. Retrofitting a properly selected inlet diffuser to the KOD (fig 16) evens out the velocity profile across vessel diameter before the gas moves upwards; thus KOD effectiveness attains the desired levels.