Candle Filters for Liquid Filtration

Candle filters offer an alternative approach for the efficient removal of fine particles in various industrial applications. 

Much like baghouse filters, these filters enable the passage of gas through them, forming a cake of trapped particles on their surface. Periodic backflushing is employed to remove the accumulated material effectively.

Candle filters provide several advantages, including thin-cake pressure filtration, cake washing, drying, slurry handling, automatic discharge, and heel filtration within a sealed pressure vessel. They are composed of three key components: a single-piece dip pipe for filtrates and gas, a perforated core with outer support tie rods, and a filter sock.

The filtrate pipe extends the full length of the candle, ensuring high liquid flow and optimal gas distribution during cake discharge. Candle materials can vary and include synthetic, stainless steel, or higher alloy options. The outer support tie rods create an annular space between the media and the core, resulting in low-pressure operation and efficient gas expansion for cake discharge.

Candle Filters Application: 

Candle filters find application in diverse industries. Typically unidirectional, they are placed within filter support vessels and can function as either surface filters or depth filters. These filters are commonly employed for suspensions with a low concentration of solid particles. Candle filters operate on a batch cycle and are used in processes involving substances such as titanium dioxide, flue gas, brine clarification, red mud, china clay, fine chemicals, and applications requiring low moisture cake filtration or high-level polishing.

Candle filters are also utilized for thickening processes, facilitating the production of concentrated flowable slurries by removing a portion of the liquid phase as filtrate.

One notable advantage of candle filters is their ease of replacement. Most candle filters are pleated, increasing their functional surface area. This design allows for higher throughputs at lower initial pressure losses compared to bag filters, though candle filters offer lower throughput rates overall.

It is crucial to note that candle filters require regular maintenance. Accumulation of particles can lead to reduced flow rates, necessitating cleaning with a soft brush and clean water every two weeks. After successive cleanings, ceramic candles may lose wall thickness and become less effective at removing microbes. The service life of candle filters varies, but they should typically be replaced every 6-12 months.

Candle filters are particularly well-suited for the following scenarios:

--When space constraints demand a compact filtration solution for large areas.

--When working with volatile liquids unsuitable for vacuum conditions.

--When exceptionally clear filtrate is required for polishing applications.

--When handling saturated brines requiring elevated temperatures, a steam-jacketed tank may be employed.

--When the cake needs to be discharged either in dry form or as a thickened slurry.

We offer a range of candle filters tailored to specific material types, temperatures, and filtration efficiency requirements. Our expertise extends to professional industrial filtration technology options, including industrial filters, filter cartridges, accessories, filter equipment, engineering services, and expert consultancy.

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