Fully automatic candle filter

Fully automatic candle filter

Fully automatic candle filter (also known as self-cleaning filter, candle filter) is a new type of pulse backwash filter developed on the basis of traditional similar products. It is a precision filtration device with unique structure, small size, high efficiency, low filtration cost, easy operation and no environmental pollution. A single machine integrates multiple tubular filter elements and has the characteristics of sealing operation, multi-function, large filtration area, strong dirt holding capacity, convenient filter cake backwashing, automatic operation, and wide application range.

The candle filter has five functions: direct filtration, pre-coating filtration, slurry concentration, filter cake recovery, and filter cake washing. It can be used in various complex filtration scenarios such as high impurity content, viscous liquids, extremely high precision, and high temperatures. 

Work principles

Candle filters combine multiple porous filter elements in a sealed container, with filter cloth (or other filter media) wrapped around the filter element. During filtration, the slurry is pumped into the filter, and the liquid phase in the slurry passes through the filter medium and enters the center of the porous filter element, and is collected and discharged at the net liquid outlet. Before the filter cake layer is formed, the discharged "clean liquid" returns to the original slurry inlet for recirculation and filtration until the filter cake layer is formed (meeting filtration requirements). Then a signal is provided to control the stop of the clean liquid circulation, and then sent to the next process through the three-way valve for normal filtration. After a period of normal filtration, when the filter cake layer on the porous candle wick reaches a certain thickness, a signal is sent to control the feeding (stop), and then the residual liquid in the filter is discharged. After discharge, a signal is provided to control the backwash port (compressed air , nitrogen or saturated steam) for backwashing to remove the filter cake. After backwashing for a certain period of time, the backwashing will stop and a signal will be sent to open the filter slag discharge port for slag discharge. After the slag discharge is completed, the slag discharge port is closed and returned to the initial state before filtration to prepare for the next round of filtration.

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Features

 - The filter element is designed with a conformal structure, which has a wide range of applications and good filtration effect.

 - Smooth operation, reliable performance and high filtration capacity.

 - Simple operation, using gas backwash cleaning, no need for slag removal, low labor intensity.

 - The filter cake can be washed and dried, saving costs and achieving good economic benefits.

 - The casing is securely sealed, no leakage, and the environment is clean and pollution-free.

 - Complete filtration in one go.

 - The entire process can be automated and controlled.

Application areas

Biopharmaceutical industry: fermentation broth extract, antibiotics, antibacterial agents, erythromycin, citric acid.

Chemical industry: amine solution, catalyst circulation and recovery, sulfuric acid, polyols, titanium dioxide, PTA particles, polyethylene glycol, potassium carbonate, epoxy resin, brine filtration in the chlor-alkali industry.

Food industry: apple juice, grape juice, raw syrup, fruit glucose syrup, grape glucose syrup, sucrose, beer, olive oil, tung oil, soybean oil, corn oil, gelatin.

Gold processing: cleaning agent, coal tar, machining cooling oil, metal foil rolling oil, electroplating liquid.