Ceramic filter is a new generation of high-efficiency and energy-saving Solid liquid separator Machinery. Due to the large mesh of the traditional filter media, serious air leakage generally exists in the filtering process, with high energy consumption, low filtering efficiency, high cake moisture, and serious concentrate filtration loss. The ceramic filter uses hydrophilic porous ceramic filter plate as the filter medium, and the filter layer is full of micro pores with micron pore size. Due to the capillary effect, only water can pass through the filter plate in the filtering process, but air cannot. Therefore, the vacuum degree in the filtering process can be maintained above 0.095 MPa, so the energy consumption is extremely low (about 90% less than the traditional disc or external filter), The water content of filter cake is low, and the concentrate basically has no loss through filtration. The porous ceramic filter media used in the ceramic filter is easy to block, so a very important step in the filtration cycle is to clean the filter disc, that is, to backwash the ceramic filter plate with clean water from the inside out. Facts have proved that the backwashing of ceramic filter plate is an extremely important process, which directly determines whether the ceramic filter can operate normally.
1. Distribution head structure of imported ceramic filter
The distribution head structure of ceramic filter is similar to that of ordinary disc filter. Generally speaking, each circle of the ceramic filter is composed of 12 ceramic filter plates of the same size. Therefore, in the distribution head structure, one side fixed on the spindle end is a valve plate (hereinafter referred to as the moving plate) composed of 12 circular holes (connected with the 12 circular holes on the spindle), which rotates with the operation of the spindle, One side connecting the vacuum pipeline and the backwash pipeline is a valve composed of two long round arc slots (the upper part is the slot in the drying area, the lower part is the slot in the suction area) and a single round hole (namely the backwash hole)
Film (hereinafter referred to as static film). The ceramic filter plate can not be backwashed timely and effectively, which directly affects the normal use of the filter.
This structure and material design lead to the following problems in the use of the distribution head:
(1) Since the ceramic filter plate is damaged during use, if it is not found in time, the mineral particles inhaled from the damaged part will cause the moving plate to form circular grooves and wear, and these grooves will connect the backwash hole and the vacuum suction hole, resulting in "leakage".
(2) As the moving piece needs to be replaced frequently, it will lead to "leakage" if not paid attention during assembly.
(3) The main reason for the "leakage" phenomenon is that the moving piece is easy to wear, but the fundamental reason is that the moving piece is made of organic materials, and its wear resistance is far from meeting the requirements of use.
2. The improvement of the sealing structure of the distribution head of the ceramic filter has been studied. Corundum ceramic materials have been selected to make moving and stationary plates, and the distribution head structure has been improved. Since corundum is one of the abrasive materials with excellent performance, the friction sealing effect is very ideal, and the actual service life is more than 1 year (it is not necessary to remove or replace during use).
3. Conclusion
(1) The fundamental reason for the "leakage" of imported ceramic filters is that the friction sealing system of soft and hard materials is used for the friction sealing of moving and stationary pieces, and the wear resistance of moving pieces made of organic materials cannot meet the operating requirements.
(2) The distribution head of the ceramic filter adopts a 3-way sealing structure, which not only increases the probability of "leakage", but also increases the difficulty of maintenance. The effective way to solve the problem of "leakage" is to change the manufacturing material of the structure of the moving and stationary pieces. The moving and stationary pieces made of corundum material have ideal sealing effect and service life.
(3) The moisture content of filter cake can be adjusted by improving the functional structure of distribution head to meet the filtration requirements of different occasions.
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