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Fiber mist eliminator candle

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Fiber mist eliminator candle

Fiber mist eliminator candle

tomek73

(Chemical)

(OP)

22 Jan 07 13:31

Hi, I work in sulphonation plant. Main reaction involves SO3 reacting with DDB (dodecyl benzene) in tubular reactor giving LABSA (dodecyl benzene sulphonic acid).
There is a gas-liquid separation after reactor. Gas stream (air, SO2 and SO3 traces, H2SO4 mists and orgaic mists) enters Fiber mist eliminator candle where liquid mists get separated and clean gas (air) is discharged to the atmosphere.
Recently we changed old reactor with new one with larger capacity. Our Fibermist eliminator (Brink filter) gets plugged up too soon. In one big casing we have two candles (L ~ 2m, D ~ 30cm).

My question is: How do design new filter for given increacesd capacity ?
Or at least what are the variables that are involved in design. I know that filter efficiency increases with Temperature increase, lower velocity (longer residence time).

I checked meny books (Perry, Chem Eng volumes etc) and couldn't find any design procedure for Brink filters. I even tried Internet.

One way of thinking is to try to use existing case and try to squeze in more candles that have smaller diameter. But that involves lots of modification and am not sure if maintanance is capable of doing it.

If anyone could help we I would be very greatfull. Thx in advance !

Regards, Tom !

Replies continue below

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RE: Fiber mist eliminator candle

rmw

(Mechanical)

22 Jan 07 21:23

http://www.kochind.com/industry/technology_products.asp

rmw

Leave the candle design to the pros. Contact Koch Industries.rmw

RE: Fiber mist eliminator candle

tomek73

(Chemical)

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Link to ZHUAN LV

(OP)

23 Jan 07 01:44

I will leave it to professionals of course, but I would like at least to know how to do prelimenary design. I would like to check existing one and to see what kind of dimensions we need for new one. Some backed up calculations or proof would help me to persue management.

Thx !

RE: Fiber mist eliminator candle

ApC2Kp

(Mechanical)

23 Jan 07 13:43

There some newer designs of fiber 'packings' and configurations, including a dual element 'candle within a candle' geometry that increases capacity with same housing.

The Brinks mist eliminators are now from MECS. Inc.
www.mecsglobal.com

If your filters are plugging up too quickly, a pre-filter layer or mesh pad might be what is needed.

tomek73,There some newer designs of fiber 'packings' and configurations, including a dual element 'candle within a candle' geometry that increases capacity with same housing.The Brinks mist eliminators are now from MECS. Inc.If your filters are plugging up too quickly, a pre-filter layer or mesh pad might be what is needed.

RE: Fiber mist eliminator candle

fhmusa

(Chemical)

13 Feb 07 08:52
Specialty Mist eliminators, such as KIMRE Inc. can very satisfactorily reduce plugging, eliminate carryover and reduce DP, and/or increase capacities. Retrofits are very easily done, and will save energy and maintenance, over the life of the plant. SEE

Candle Filters are too flow restrictive for increasing capacity,and are very susceptible to plugging and high DPs.Specialty Mist eliminators, such as KIMRE Inc. can very satisfactorily reduce plugging, eliminate carryover and reduce DP, and/or increase capacities. Retrofits are very easily done, and will save energy and maintenance, over the life of the plant. SEE www.kimre.com , and review H2SO4 info on site ( http://www.kimre.com/publications/kimre_mist_eliminators.pdf ).

RE: Fiber mist eliminator candle

ash

(Chemical)

13 Feb 07 17:06

Having worked in H2SO4 plant I would advise against a Kimre pad.  While it has lower dp it also doesn't remove droplets very well at all.  Unless it was being used as a pretreater to the candles.

MECS (Monsanto Enviro Chem) is the best bet for candle mist eliminators.  They can help with some different mesh weaves to possibly allow increased capacity.

If your tube sheet is large enough to accomodate more candles that would of course be the way to go.

The biggest design factor is going to be how much dp your process can handle.

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News

Date: -12-22 | Author: Samuel Chuku

Mist eliminator filters are vital in the gas scrubbing process because they remove fine droplets from the air before it is sent into the environment. Since the introduction of stricter environmental laws to significantly limit the expulsion of polluting gasses from gas-washing plants, mist eliminators have become more vital than ever. Mist eliminators can separate droplets as fine as 10 micrometers or less, and it does so with a low pressure drop. Before designing a mist eliminator filter, it helps to gain an understanding of how droplets are formed and how they flow in a gas. Several different factors need to be considered before choosing the best method to eliminate droplets from gas.

Some of the mist eliminator filter criteria include:

• Size of the droplets
• Pressure drop
• Flooding potential

How To Select The Right Mist Eliminator

Liquid droplets are created in different sizes depending on how they were formed. There are three major categories of droplets based on their size: fogs, mists, and sprays. When the droplets created are of a size less than 3 microns, they are categorized as fog. Sizes of droplets between 3 microns and greater are termed a mist. Lastly, those droplets that are larger than 20 microns are called a spray.

The mist eliminator is chosen depending on the size of the droplets. For instance, particles termed as mist would be best suited to a wire knitted mesh demister. On the other hand, for particles that are 20 microns or larger, vane-type mist eliminators are most used.

There are many mist-eliminating devices available on the market today. One popular example is candle filters. Candle filters are made using a robust wire mesh made from stainless steel. They can filter out droplets of sizes 10 to 150 microns.

Another example is a polymer filter candle which is designed to get rid of solid impurities. They are popularly used in the chemical, textile, and plastic industries. There are various types of polymer candle filters as well, namely pleated wire mesh candle filter and pleated sintered fiber candle filter. The filters usually need to tolerate extremely high pressures and temperatures.

The entire process or application can become compromised if a filter&#;s performance and strength are unreliable. For a more reliable and efficient technology, visit Kimre&#;s website, where you can find the best mist-eliminating devices.

For more information, please visit fiber mist eliminator.