Candle filters for droplet separation

Candle filters are used for the separation of droplets <2µm at low gas flow velocities.

Each candle filter consists of millions of packed fibres. The efficiency of a single fibre is low, but the cumulative effect is high. In order for Brownian diffusion to be effective, i.e. to separate droplets <2µm, it is necessary that the gas has a low entry velocity.

Candle filters are used to efficiently recover product in various processes, remove visible plumes from chimneys and to reduce emission levels.

Linda Caporicci Column internals, Droplet separation, Spray nozzles & systems, Other products

I look forward to providing product advice and solutions! Let's meet via a video call or a site visit. You can also phone or email us, of course.

Alexander Bergman Drip separation, Column interior, Nozzles & spray systems, Tank cleaning, Compressed air products

I look forward to providing product advice and solutions! Let's meet via a video call or a site visit. You can also phone or email us, of course.

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Candle filters for effective separation of droplets <2µm

Design and function

Candle filters are installed vertically in a tower and the gas passes horizontally through the filter wall. Inside the filter, the droplets coalesce and are then drained from the filter by gravity.

There is a wide variety of fibre materials to choose from: glass, carbon, polypropylene, polyester, teflon, etc.

Areas of application

Candle filters are used to efficiently recover product in various processes, remove visible plumes from chimneys and to reduce emission levels.

Brownian diffusion

Brownian diffusion occurs at low gas velocities, normally below 0.2 m/s and maximum up to 0.25 m/s, when the gas passes through a bed of very fine fibres. The small liquid droplets collide with the surrounding gas molecules, forcing the liquid droplets to move in different directions and eventually collide with the fibres in the bed. The smaller the diameter of the fibre, the smaller the liquid droplets that can be captured from the gas flow.

Checklist important parameters

In order to offer an effective and sustainable solution, below are a number of process parameters that are important to consider when selecting and designing a droplet separator.

Sometimes it is difficult or even impossible to obtain information and data regarding the specific process. Together with our suppliers, we have extensive experience and we can make sound assumptions as a basis for designing the best solution for the process.

Operating data
Gas	Unit
Maximum gas volume flow	m³/h
Gas density (operating conditions)	kg/m³
Kinematic gas viscosity	mm²/s (cSt)
Operating pressure	bar (a)
Operating temperature	°C

Operating data
v	Unit
Liquid content	kg/h
Liquid density	kg/m³
Surface tension	v
Dynamic viscosity of the liquid	mPass

Geometrical data
Data	Info/unit
Flow direction	horizontal or vertical
Installed in column	column or pipe
Column diameter or dimension	mm
Opening for installation	manhole or vessel flange

Requirements
Data	Info/unit
Type of mist eliminator	wire mesh or vane type
Type of material	Please specify
Separation efficiency	%
Separation efficiency/Limit drop size	µm
Maximum pressure drop	mbar
Other requirements	Please specify

Documents for download

Begg Cousland Droplet separation

Choose the right product for effective and optimised droplet separation

Every process is unique. The Knowledge base provides information on how droplet separation works and what questions need to be answered to achieve an effective and sustainable solution.

To the knowledge base

Begg Cousland Envirotec has vast know-how and experience in the field of droplet separation with a complete range of demisters, coalescers and candle filters.

Many applications may be similar at a first glance, but there are often small differences that are crucial to consider for an optimal solution. With an extensive experience in many industries, Begg Cousland's technical team are able to deliver the most effective solution for a specific problem and process.