KO Drum in­let dif­fusers

Chemical Industry Digest - - Compressor -

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.

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