Quick Understanding & Estimation of Mist Eliminator in Gas-Liquid Separator

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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 :

1. What type of mist eliminator (e.g. mesh pads, vane pack, etc) should be used ?
2. What are the advantages and disadvantages of mesh pad and vane pack ?
   
3. How mesh pads and vane pack trap liquid droplet ?
4. What is the liquid capture efficiency of mesh pad and vane pack ?
5. How droplet size, mesh strand diameter, gas velocity, liquid density, gas density, gas viscosity, mesh pad/vane pack design affecting liquid capture efficiency ?
6. What is the limit of mesh pad compare to vane pack ?
7. How do i size mesh pad or vane pack mist eliminator ?
8. What are the geometry and installation requirement of separator with mist eliminator ?
   
9. ...etc

First advice to young engineer is read this great article "MESH & VANE Mist Eliminator" by AMISTCO. Basically, this article most of your questions.

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

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Air Pollution Control & Tail Gas Treatment

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Ceilcote Air Pollution Control (CAPC) is EPC company in solving environmental control. CAPC design, fabricate, install and service a complete line of air pollution control equipment.

CAPC products line includes :

- Tellerette® Tower Packing

- Scrubbers,

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Tellerette packing is a special design offered by CAPC...

Read...Tellerette Tower Packing Benefits/Features, How it Works, Benefits/Features and Tellerette packing technical Data Sheet

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AMISTCO (P2) - Extensive info on Mist eliminator & Column Internals

[CONTINUE...]

Technical Bulletins (Amistco)

Double Pocket Vane Mist Eliminators

Structured Grid Packing

Re-Usable Metal Filters (RMF)

MISTFIX™ Insertion Mist Eliminators

Packing Supports

Filter Separators/Coalescing Filters

Improved Pall Ring Liquid Distributors - Weir Trough Type

Sheet Metal Packing

High Performance Packing

Liquid Distributors - Orifice Riser Type

Knitted Structured Packing

Pall Ring Packing

Uniflo Inlet Diffusers

Woven Structured Packing

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Liquid/Liquid Coalescers

Pollution Control Packages

Carbon/Graphite Raschig Rings

Coalescers for Oily Wastewater Separators

Insulation Blanket Mesh

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AMISTCO (P1) - Extensive info on Mist eliminator & Column Internals

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...

AMISTCO has published several good articles for Mesh and Vane Mist Eliminators from fundamentals, application, and design aspects.

1. Types of Mist Eliminators

2. Fundamental Considerations

3. Sizing for Gas Velocity
4. Mesh vs. Vanes - or both
5. Applying Mist Eliminators
6. Curves

A complete PDF copy for Mesh & Vane Mist Eliminator and Mist Eliminator Installation Guide

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Koch-Glitsch LP - One of the OSHA site Star !

Koch-Glitsch LP - One of the OSHA site Star !

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

Using the Phase Doppler Particle Analyser (PDPA) Laser Probe for FGD Moisture Carryover Measurements

Computer Simulation Helps Solve SO2 Scrubber Problem in Primary Aluminum Smelter Plant

Liquid-Liquid Coalescing

Brochure...

Mist Elimination

Overview of Koch-Otto York Product Line and Applications

DEMISTER® Mist Eliminator Installation Manual

FLEXICHEVRON® Mist Eliminators

FLEXIFIBER® Mist Eliminators

FLEXIFIBER® Lube Oil Field Installation and Operating Instruction Manual

Using FLEXIFIBER® Mist Eliminators in High Fluroride Applications

FLEXIFIBER mist eliminators with carbon fiber. High Fluroride Applications historically corrosive to glass fibers.

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)

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KG (Part 2) :- A brand that should not be missed by any Chemical & Process Engineer

CONTINUE...

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High Performance and Conventional Trays

SUPERFRAC® High Performance Trays
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TRITON® High Capacity Fractionation Trays
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Packing and Internals for Severe Services

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FAQ

17 Critical Questions
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?

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KG (Part 1) :- A brand that should not be missed by any Chemical & Process Engineer

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.

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ACS - Design manual for Mist Eliminators, Trays, Packing, Internals...All in distillation columns

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

- Mist Eliminator Design Manual covers both mesh and vane type mist eliminators. Includes material types, design theory, sizing, and application case studies.

- Liquid-Liquid Coalescer Design Manual covers all liquid separation media types down to 1 micron. Includes various element types, design theory, sizing, and application case studies.
- 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

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KnitMesh...Good Articles on Mist eliminator still available FREE...

KnitMesh...a subsidiary of SULZER Chemtech today...Its separations technology business has been acquired by Sulzer Chemtech since Decr 13th, 2006.

Entire acquisition process may be completed by first quarter of 2007. PRESS release notes... KnitMesh website is still exist today...and there are quite a lot of good articles available FREE for download... We are not sure if this site will continue to exist...I would encourage you to visit this site now and get these good articles before it is demolished...You need to register prior to any download...

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

Automotive

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

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