Tuesday, January 22, 2008
There are many young design engineer will experience or has experienced gas - liquid separator sizing. In most cases, a mist eliminator is used to trap small liquid droplet entrained in the gas. Now the engineer may experience difficulties in answering the following questions :
- What type of mist eliminator (e.g. mesh pads, vane pack, etc) should be used ?
- What are the advantages and disadvantages of mesh pad and vane pack ?
- How mesh pads and vane pack trap liquid droplet ?
- What is the liquid capture efficiency of mesh pad and vane pack ?
- How droplet size, mesh strand diameter, gas velocity, liquid density, gas density, gas viscosity, mesh pad/vane pack design affecting liquid capture efficiency ?
- What is the limit of mesh pad compare to vane pack ?
- How do i size mesh pad or vane pack mist eliminator ?
- What are the geometry and installation requirement of separator with mist eliminator ?
- ...etc
Although this article may assist you in determining the type of mist eliminator, dimension, mist eliminator thickness, gas flow area, etc using a recommended design Souders-Brown vapor load factor (K), however there are still many other type of mist eliminator (MistFix insertion mist eliminator, double-pocket vane pack, which potentially result better removal efficiency and cost effective as compare to ordinary mesh pads and vane pack. In addition, the graph is tested with air-water mixture, it may have some deviation with actual process fluid. The deviation could be insignificant or very significant.
You may use above proposed method for PRELIMINARY sizing in order to get a quick separator dimensioning, the detail selection and calculation shall be conducted by mist eliminator supplier with their proprietary graph and correction parameters.
In many real world examples, the mist eliminator thickness would be in the range of 4"-6". Thus, you may use this PRELIMINARY thickness in quick separator dimensioning.
Related Topic
- AMISTCO (P2) - Extensive info on Mist eliminator, knitted mesh, random & structured packing, distillation
- AMISTCO (P1) - Extensive info on Mist eliminator, knitted mesh, random & structured packing, distillation
- KnitMesh...Good Articles on Mist eliminator still available FREE...
- ACS - Design manual for Mist Eliminators, Trays, Packing, Internals...All in distillation columns
Labels: Mist Eliminator, Separation, Separator
Wednesday, May 23, 2007
Crossflow Packed Scrubbers
Vertical Air Washers
FRP Venturi Scrubbers for Corrosive Applications
Horizontal Air Washer
WebWorm
Labels: Absorption, Air Pollution Control, Mist Eliminator, Packed Column, Packing, Scrubber, Separator, Tail Gas Treatment, Tower internals
Friday, May 18, 2007
Technical Bulletins (Amistco)
WebWorm
Labels: Column, Design, Distillation, Mist Eliminator, Packed Column, Packing, Separation, Souders-Brown, Tower internals
Thursday, May 17, 2007
AMISTCO, a mist eliminator, knitted mesh, random & structured packing, distillation inlet distributor, internal support, filter & coalescer manufacturer. Incorporated 26 years ago and located in Alvin Texas, South of Houston...WebWorm
Labels: Column, Design, Distillation, Mist Eliminator, Packed Column, Packing, Separation, Souders-Brown, Tower internals
Tuesday, May 15, 2007
Koch-Otto York® Separations Technology), a business group of Koch-Glitsch, LP, provides mist elimination equipment for gas-liquid separation, liquid-liquid separation, as well as vapor flow conditioning devices, for a broad base of industries including chlor-alkali, gas transmission, indoor air quality, petrochemical, power generation, pulp & paper, refining, and sulfuric acid.
FREE articles relates to Mist Eliminator
Demystifying the Selection of Mist Eliminators
Chem. Eng. Nov-Dec 1993, Overview of Mist Eliminator Engineering, Selection, and Sizing
Mist eliminators for sulphuric acid plant duty
British Sulphur 1982 - Overview of Mist Eliminators for Sulphuric Acid Plants
Laser-based Instrument Measures Mist Elminator Carryover
Brochure...
DEMISTER® Mist Eliminator Installation Manual
GOODLOE® Tower Packing
Following articles are available from KGLP site upon request...
Performance of Commercial Chevron Mist Eliminators
Accurate Evaluation of Chevron Mist Eliminators
Lubrication Oil Reservoir Mist Elimination
New methods for fighting sulfuric acid mist emissions
A New Concept “Plant in a Pipe” SX Design (Liquid-liquid extraction)
Metals Solvent Extraction Plants (Liquid-liquid extraction)
Labels: Coalescer, Column, Distillation, Fractionation, Mist Eliminator, Packed Column, Packing, Tower internals
Wednesday, May 9, 2007
CONTINUE...
FREE BROCHURES
High Performance and Conventional Trays
SUPERFRAC® High Performance Trays
ULTRA-FRAC® High Performance Trays
TRITON® High Capacity Fractionation Trays
PROVALVE® Valve Trays
FLEXITRAY® Conventional Valve Trays
Tray Technologies
OMNI-FIT® Technology
SPEED-WAY® Manways
SATURN® Technology
Structured Packing
Packing and Internals for Severe Services
Random Packing
Plastic Random Packing
Metal Random Packing
FLEXIMAX® Random Packing
Packed Tower Internals
Metal Packed Tower Internals
Tower Internals Hardware and Services
1. Q: How do you calculate tray capacity? 2. Q: What about flexibility?
3. Q: How do you cost trays?
4. Q: How many flow paths should be specified?
5. Q: How do you calculate diameter?
6. Q: What if existing columns are too small for new operating conditions?
7. Q: Are there considerations of distribution independent of trays?
8. Q: Does top tray feed demand special care?
9. Q: Will all liquid feed streams contain vapor?
10. Q: How do you orient seal pans and nozzles?
11. Q: Are there special considerations for the bottom tray?
12. Q: Should I use reboiler baffles?
13. Q: Are sumps always needed?
14. Q: Should chimney trays be used?
15. Q: What accommodations must be made for flow path changes?
16. Q: Do crude towers require special treatment?
17. Q: Is special attention needed during start-up?
Other Questions
1. Q: What is flooding?
2. Q: What causes flooding?
3. Q: What is jet flood?
4. Q: What causes downcomer flooding?
5. Q: Why does Koch-Glitsch recommend a maximum percent of flood of 80%?
6. Q: Why are so many downcomer sizes used?
7. Q: What is the purpose of recessed inlet sumps under the downcomer?
8. Q: What is the purpose of anti-jump baffles?
9. Q: Why do some tray manufacturers not use downcomer baffles?
10. Q: What is the difference between splash baffles and downcomer anti- jump baffles?
11. Q: When are picket fence weirs used?
12. Q: When are notched weirs useful?
13. Q: What about inlet weirs?
14. Q: When is tray leakage detrimental to the operation of the tray?
15. Q: What is the meaning of unit reference?
16. Q: How is unit reference used?
17. Q: Some manufacturers use 14 and 16 gauge units on alternating rows. Why does Koch-Glitsch use 16 and 12 gauge units, since this is more expensive ?
18. Q: What determines the flexibility of a tray?
19. Q: Which Koch-Glitsch tray has the greatest flexibility?
20. Q: Which has the highest capacity, a valve or sieve tray?
21. Q: If a sieve and valve tray have the same capacity, why are sieve trays not better?
22. Q: Why or when should a bubble cap tray be used?
23. Q: What size bubble cap should be used?
24. Q: What about a tea-cup cap?
25. Q: What about the Koch-Glitsch V-O tray?
26. Q: Why does Koch-Glitsch specify rectangular or square stacks on chimney trays?
27. Q: Why does Koch-Glitsch insist on draw sumps instead of permitting the draw nozzle to be flush with the chimney tray floor?
28. Q: Will liquid flow down the risers of chimney trays in the event of upset conditions?
29. Q: What vapor feed entry is recommended for atmospheric and vacuum crude towers and FCC fractionators?
30. Q: What about mist eliminators?
31. Q: Should mist eliminators have top holddown grids?
32. Q: What is tray efficiency?
33. Q: Under what circumstances are packings chosen over trays?
34. Q: How do Koch-Glitsch packed column design procedures differ from those 01 other manufacturers?
35. Q: What is KGA ?
36. Q: What is the maximum allowable bed depth for a single metal packed bed?
37. Q: What is the maximum allowable bed depth for a single plastic packed bed?
38. Q: Can grid-style support plates be used with plastic packings?
39. Q: Why are tangential entrances recommended for certain tower feeds?
40. Q: How is a flashing feed distributor different?
41. Q: Are packed tower internals less expensive than trays?
42. Q: What is the difference between bed limiters and bed hold-downs?
43. Q: Why don't other manufacturers recommend the use of bed limiters and bed hold-downs?
44. Q: What is the best liquid distributor for a packed tower?
Labels: Column, Distillation, Fractionation, Mist Eliminator, Packed Column, Packing, Tower internals
Monday, May 7, 2007
Koch-Glitsch, a manufacturer of mass transfer products that you should not be missed by any Chemical and Process Engineer... global leader in the design and manufacture of state-of-the-art mass transfer products for the chemical, petrochemical, refining, gas processing, pharmaceutical, and specialty industries. Products including
FREE ARTICLES
Labels: Column, Distillation, Fractionation, Mist Eliminator, Packed Column, Packing, Tower internals
Sunday, May 6, 2007
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ACS Separations Technologies
Suppliers for
- custom engineered mist eliminators
- fractionation trays
- random packing
- tower internals
- liquid-liquid coalescer
for E&P, refining and petrochemical industries.
Some good articles shared by ACS Separation Technologies...
Design manual
- ACS/Montz Packing Design Manual catalog covers all types of structured and random packings made from wire, sheet metal foil, and expanded metals. Includes material types, design theory, sizing and performace curves, and applications.
Technical Papers
- Improving Gas Dehydrator Efficiency - ACS Optimiztion of mist elimination equipment for Glycol & Amine gas treatment systems
- Oily Water coalescers for environmental clean up and produced water remediation
- No welding process vessel upgrades for mist eliminators, coalescers, and inlet diffusers
Products
ACS Product Line Card - English
ACS MisterMesh high-capacity mesh pads
ACS Plate-Pak Vane Mist Eliminators
ACS/Montz Sturctured & Random Packing
ACS Fractionation Trays
ACS Tray Hardware and Fasteners Catalog
Labels: Distillation, Fractionation, Mist Eliminator, Packing, Tower internals
Friday, May 4, 2007
Separation
Coalescers Brochure
VKR Enhanced™ Mist Eliminators
Mist Elimination article Hydrocarbon Engineering June 2003
Mist Elimination article Hydrocarbon Engineering March 2001
Mist Eliminators for gas dehydration systems
Mist Eliminators Brochure
Mass Transfers Brochure
Common Mist Eliminator Specifications
Coalescers for Hydrogen Peroxide application
Mesh Mist Eliminators for steam drum duties
Air Bag Filters
Anti-Vibration Sound Attenuating & Heat Shield Components
Catalytic Convertor Mesh Wraps
Catalytic Convertor Seals
Engine Breathers
Exhaust Decoupling Rings & Mesh Sleeves
Separation Rings
Silencer and Muffler Packings
Spacer Rings
Special
Anti-Vandal / Anti-Stab Mesh
Filters Brochure
EMC
Knitted wire mesh tapes
All metal wire mesh gaskets
All metal compressed wire mesh gaskets
Gaskets with fluid seal
Mesh over elastomer core gaskets
Labels: Coalescer, Mist Eliminator, Separator
