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 High temperature resistant high efficiency filter

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High temperature resistant high efficiency filter
It is an indispensable treatment method in the process of fluid purification, which is mainly used to remove particles or other suspended solids in the fluid. The principle of the filter is to use porous media to remove pollutants from the fluid (liquid or gas) to make the fluid reach the required cleanliness level. A filter, or screen, is often considered to be a simple separation. This is the way in the past. Nowadays, most of the filter walls are thick. In other words, the filter equipment has depth, which plays an auxiliary role in removing pollutants in the form of "curved channels". The filter is a device to remove a small amount of solid particles in the liquid. When the fluid enters the filter cartridge with a size of * * filter screen, the impurities are blocked, and the clean filtrate is discharged from the outlet of the filter. When cleaning is needed, screw the plug at the bottom of the branch pipe to drain the fluid, remove the flange cover, take out the filter cartridge, and install it again after treatment. As we all know, the core element of the filter is the filter membrane, which is a kind of film which is prepared on the microporous support layer (support body) and is full of more micro pores. There are many materials (such as ceramic membrane) made of inorganic fiber. The membrane filter has high filtration precision, stable particle size control, and easy to recover performance by backwashing. Therefore, it is very convenient to use and maintain.
 
Filtration mechanism and influencing factors
 
1.1 filtration mechanism
 
There are two main mechanisms of high temperature resistant filtration. One is based on the particle size, such as interception, screening and surface capture; the other is adsorption, that is, particles adhere to the filter under the action of chemical / charge. This requires pharmaceutical companies to choose different filtration membranes according to their actual needs.
 
1.2 factors affecting filtration
 
1.2.1 fluid characteristics
 
It is related to the characteristics of the fluid. For example, the viscosity and chemical / ionic composition of the fluid, the higher the viscosity of the fluid, the slower the flow rate under the same pressure conditions, the more contact between the fluid and the membrane, the better the filtration effect; another example, the mixing / contact time of the fluid and the membrane also has a great influence on the filtration effect, and the longer the mixing / contacting time is, the better the filtration effect is. In addition, it should be noted that the characteristics of the fluid only affect the adsorption and retention effect of the membrane, but not the particle size exclusion.
 
1.2.2 operating conditions
 
It is related to the actual operating conditions, such as particle flow rate and filtration pressure. In order to achieve good filtration effect, generally choose a lower flow rate, the lower the flow rate, the better the retention effect. Practice has proved that the structural movement of membrane is unfavorable to filtration. Once the structure of membrane changes in the process of filtration, particles and fibers can precipitate from the deep filter, affecting the filtration effect. However, the velocity / pressure difference only has an important effect on the adsorption retention, and has little effect on the size exclusion.
 
1.2.3 particle type
 
There is also a great relationship between the type of particles and the filtration effect. The particles can be divided into deformable particles and non deformable particles. Under the pressure of * *, the deformable particles will enter the filter membrane and cause more mesh blockage, which will affect the filtration effect, such as the filtration of gel. However, when the immutable particles are filtered, a layer of cake like object will be formed on the filter membrane.
 
1.2.4 type of filtration membrane
 
The pore size and structure of different membranes are different. The structure of some membranes is rigid, while the structure of some membranes is movable. There is no uniform Chinese standard for the rated pore size of pre filtration membrane. Different manufacturers have their own definitions and methods. Therefore, great attention should be paid to the selection and replacement of the manufacturers. For the same 0.22 μ m pre filtration membrane, the filtration effect of different manufacturers will be greatly different. The common pore size of sterilization and filtration is defined by laws and regulations, and all businesses implement the same standard, so it is relatively simple to select and replace.
 
1.2.5 filter material
 
According to the relationship with water, the filtration materials can be divided into hydrophilic (water can be wetted) and hydrophobic (water can not be infiltrated). Hydrophilic filter is mainly used in filtration and sterilization filtration of water or water / organic solution mixture, such as cellulose material (regenerated cellulose, mixed cellulose ester), PVPP polycarbonate, PVDF modified polyvinylidene fluoride; hydrophobic filter is mainly used in solvent, acid, alkali and chemical filtration, tank / equipment breathing For example, PTFE polytetrafluoroethylene, PVDF polyvinylidene fluoride, polypropylene, polysulfone, polycarbonate, etc.
 
2 filter characteristics and structure
 
Filters are generally divided into deep filter (primary filter), surface filter (intermediate filter) and membrane filter (deep filter). The fiber of the deep layer filter falls off from time to time, and can not give an exact pore diameter. The thickness is generally 3-20 mm, which usually has adsorption effect and has large pollution bearing capacity; the fiber of surface filter is generally made of thermal bonding or film coating, and the rated pore diameter can be given, which is relatively thin (< 1 The main characteristics of the membrane filter are hard texture, not easy to break, with tortuous channels and very high internal surface area, with an opening rate of * *, which can be used for integrity test. It is commonly used in deep filtration, such as aseptic filter.
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