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STAGED COLUMN DESIGN

STAGED COLUMN DESIGN. K. M. Tanvir Ahmmed Lecturer, ChE, BUET. TYPES OF TRAY. Bubble cap tray : old Sieve tray : simple Valve tray : modern usage. BUBBLE CAP TRAY. BUBBLE CAP TRAY. Advantages flexible : operates satisfactorily at very high and low liquid flow rates. Disadvantages

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STAGED COLUMN DESIGN

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  1. STAGED COLUMN DESIGN K. M. Tanvir Ahmmed Lecturer, ChE, BUET

  2. TYPES OF TRAY Bubble cap tray : old Sieve tray : simple Valve tray : modern usage

  3. BUBBLE CAP TRAY

  4. BUBBLE CAP TRAY • Advantages • flexible : operates satisfactorily at very high and low liquid flow rates • Disadvantages • high entrainment: requires higher tray spacing • significant liquid gradient • problems with coking, high fouling mixtures • expensive • Poor turndown performance

  5. BUBBLE CAP TRAY (CONT’D)

  6. SIEVE TRAY

  7. SIEVE TRAY (CONT’D) • Advantages • easy to manufacture • inexpensive • considerable design information is available • efficiency is good at design condition • very good in fouling applications • Disadvantages • turndown is poor (efficiency falls below the design condition) • not flexible

  8. VALVE TRAY

  9. VALVE TRAY (CONT’D) • Advantages • better turndown ratio • more flexible • new industrial columns are more likely to have valve trays • Disadvantages • Higher pressure drop than sieve tray • 20% more expensive than sieve tray • more likely to foul or plug in case of dirty mixtures

  10. VALVE TRAY (ONE-PIECE VALVE)

  11. VALVE TRAY

  12. VALVE TRAY

  13. VALVE TRAY (CAGED VALVE)

  14. VALVE TRAY (CAGED VALVE)

  15. VALVE TRAY (FIXED VALVE)

  16. VALVE TRAY

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