Stainless steel candle filter

The stainless steel candle filter is installed in a closed container, combined with multiple porous filter elements. The filter cloth (or other filtering medium) is filtered on the outer jacket of 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, where it is collected and discharged at the clear liquid outlet. Before the formation of the filter cake layer, the discharged "clear liquid" returns to the inlet of the raw slurry and is sent to the filter for circulating filtration until the filter cake layer is formed (meeting the filtration requirements), providing a signal to control the clear liquid to no longer circulate. The clear liquid is sent to the next working sequence through a three-way valve for normal filtration.

　　Stainless steel candle filterAfter a period of normal filtration, when the filter cake layer on the porous wick reaches a certain thickness, a signal is provided to control the feeding (stop), and then the residual liquid in the filter is drained. After draining, a signal is provided to control the blowback port (compressed air, nitrogen or saturated steam) to blow back, causing the filter cake to fall off. After a certain period of blowback, the blowback is stopped and a signal is provided to open the filter slag discharge port for slag discharge. After the slag discharge is completed, the slag discharge port is closed, returning to the initial state before filtration and preparing for the next round of filtration.

The main advantages of stainless steel candle filters are:

When used for clarifying liquids, additives such as diatomaceous earth and activated carbon can be directly added to the slurry to increase filtration rate and clarify the filtrate. The accuracy range is from 1 μ m to 300 μ m.

Fully enclosed operation, suitable for filtering general materials, as well as for filtering hazardous products that are flammable, explosive, toxic, or highly toxic, as well as fresh foods, biological products, and drugs that are not allowed to be contaminated.

In the later stage of filtration, if the residual slurry at the bottom cannot be discharged back into the slurry tank, a pump can be used to extract the residual slurry at the bottom, and then return it to the top cover of the filter machine in the center, and evenly spray it onto the filter tube through the nozzle. Compressed gas is input into the machine to filter out all the residual liquid.

Due to the ability of this machine to form a uniform layer of filter cake during filtration, it is convenient to wash the filter cake by introducing detergent into the machine. If the filter cake is washed by top spraying, it can greatly save washing solution.