It refers to the mechanical equipment or device used for filtering, which is a common equipment commonly used in industrial production. Filtering equipment is generally divided into two categories: vacuum and pressure. Vacuum is commonly used in drums, discs, horizontal belts, etc., and pressure is commonly used in pressure filtration, pressing, dynamic filtration and rotary type.
Multi-media filter, also called mechanical impurity filter, is one of the main equipment for water quality pretreatment. According to the water quality, the corresponding design scheme is adopted to efficiently remove impurities such as suspended solids, colloids, silt, clay, humus, and particulate matter in the water, reduce the turbidity of the water, and achieve the purpose of clarifying the water quality. Filtering equipment is a general term for a variety of filtering facilities. It refers to the mechanical equipment or device used for filtering, which is commonly used in industrial production.
By media type Air filter The polluted air is cleaned to the state required for production and life, that is, the air is cleaned to a certain degree. 2.Liquid filter The contaminated liquid is cleaned to the state required for production and life, that is, the liquid has a certain degree of cleanliness. 3. Network Filter Set up to block spam and make the information displayed on the computer screen meet the requirements as much as possible. The principle of same absorption separates different colors of light 4.Light filter Absorb some unwanted light.
Divided by installation method Suction filter Oil return filter In-line filter
Divided by performance: In-line filter Binocular filter High pressure filter
Divided by working principle Bag filter 1. Compact structure and reasonable size. Installation and operation are simple and convenient, and the floor space is small. 2. High filtering accuracy, suitable for any fine particles or suspended matter, and the filtering range can be from 1 to 800 microns. 3. The processing flow per unit filtering area is large, the filtering resistance is small, and the filtering efficiency is high. The filter function of one filter bag is equivalent to 5 to 10 times of the same type of filter element, which can greatly reduce the cost; the design flow can meet the requirements of 1 to 500m3 / h, and the cost is low. 4. Wide range of uses, which can be used for rough filtration, middle filtration or fine filtration; in the case of achieving the same filtering effect, compared with plate and frame fine filter, filter element and other equipment, it has lower investment cost, longer service life and filtration. Low cost and other advantages. Intermittent pressure filter Working pressure: 0.3-0.8Mpa, up to 3.5 Mpa, suitable for separation with small solid and liquid density difference and difficult to settle, or liquid with high solid content and requiring clarification, or high solid phase recovery rate, filtration When the cake contains low moisture content, the filter press has strong driving force, high filtration rate, small area per unit filtering area, strong adaptability to materials, wide selection of filtering area, and wide application. ◆ plate and frame filter press Simple structure, convenient production, small footprint, high operating pressure, large filtering area, suitable for sticky materials, low moisture content of filter residue, shortcomings are intermittent operation, low production efficiency, high labor intensity, and fast filter cloth loss. Box filter press Similar to plate and frame filter press, but with few parts, the cost per unit filtering area is about 15% lower, and the sealing surface is reliable, but the filter cloth is troublesome to install, the filter cloth is lost quickly, and the operation cost is high. Most of them are used for large processing. Mass production. Membrane filtration Filter element made of various materials such as metal wire, filter cloth, filter paper, yarn, microporous plastic, microporous ceramic, etc., fixed on the tube sheet, packed in a pressure-resistant barrel, with a filtration area of 3-30m2, working pressure At 0.2Mpa. Fine filtration or ultra-fine filtration with filtration accuracy> 0.1um, for small batch production. Tube filter Micron-level filtration equipment composed of rigid porous filter media can filter 0.5um-100um of sticky fine materials at one time, and can obtain a clear filtering effect of the filtrate. 1. High filtering precision and wide range, can meet different filtering precision requirements 2. Resistant to acids, alkalis, salts and various organic solvents, non-toxic, odorless, and free from foreign matter 3. Vertical structure, small footprint 4. Easy operation, large processing capacity and low investment cost 5. Recycle the slagging with compressed air or “air-water”, and also use chemical regeneration. The filter element has a long service life. Continuous pressure filter The operations of feeding, filtering, washing, blowing and unloading are carried out continuously and simultaneously. High filtration speed, low moisture content, clean environment, and more suitable for automatic control. Drum pressure filter The operation is continuous, the filter cake has low moisture content, good washing effect and low water consumption. At present, the maximum filtering area is 8m2, and the operating pressure is about 0.3Mpa. Disadvantages are complex structure, difficult maintenance, suitable for large-scale production, Vertical continuous pressure leaf filter This model is suitable for the filtration of difficult-to-filter materials in chemical or pharmaceuticals. The structure is complex, the space occupied is large, and the maximum filtering area is 8m2. Horizontal continuous pressure leaf filter The structure is complex, suitable for large-scale production and automatic control operations. Continuous disc filter Used in flotation clean coal processing. Dynamic rotary leaf filter press The high shear force generated by the rotating parts can be used to limit the thickness of the filter cake layer, and a high filtration speed can be obtained. It is particularly suitable for the filtration of highly dispersed, low concentration and compressible materials. The process is performed to reduce the consistency of the slurry. This equipment is mainly applicable to the two categories of concentrated dehydration and washing, used for clarification and less filtration, as well as difficult to filter and difficult to wash materials. Intermittent vacuum filter The mechanism of a vacuum filter and a pressure filter is basically the same, except that the pressure on one side of the filter medium is lower than atmospheric pressure, and the driving force is small. Vacuum filter The structure is simple, and the filtering driving force is larger than that of the gravity filter. Vacuum leaf filter The structure is simple and suitable for general mud-like material filtration, but the operating conditions are poor and the labor intensity is high. External filter drum vacuum filter Can be operated continuously and automatically, can effectively filter, wash, dehydrate, clean the operation site, easy to inspect and repair. Disadvantages are high cost, the use range is limited by the vapor pressure of hot or volatile liquids, materials with low boiling points or volatile materials at operating temperatures cannot be filtered, it is difficult to handle slurry with high solid content and large changes in particle characteristics, and filter cake The moisture content is about 30%, rarely less than 10%, and is mainly used in the chemical and food industries. Internal filter surface rotary vacuum filter It is suitable for filtering suspensions with uneven thickness of solid particles, no stirring device is needed, the cost of the machine is low, and it can adapt to changes in the concentration of the feed. If it is required to operate at high temperatures, it is easy to take thermal insulation measures. The disadvantage is that the surface of the drum cannot be fully utilized, and the filter cake needs a certain viscosity, otherwise it will fall off easily, resulting in a decrease in vacuum and a change in the feed flow; it is difficult to replace the filter cloth. Disc Vacuum Filter The filtering price per unit is the lowest, the floor space is small, but the humidity of the filter cake is higher than the rotary vacuum filter. Because the filter surface is vertical, the thickness of the filter cake is uneven, it is easy to crack, and it is not easy to wash. Easy to handle materials with low sedimentation speed and easy filtering, not suitable for processing non-sticky materials. The application range is the same as that of rotary vacuum filter. Turntable vacuum filter The structure is simple, the washing effect is good, the washing liquid is separated from the filtrate. For the slurry with fast dehydration, a single filter has a large processing capacity. The disadvantage is that the floor area is large, the filter cloth wears quickly, and it is easy to block. Dump Vacuum Filter Can filter viscous materials, strong adaptability, suitable for separation of solids with a mass fraction of more than 20%, high density, and easy to separate and filter cake to be fully washed slurry, often used in chemical, light industry and other industries. Bag vacuum filter It is divided into fixed chamber type, mobile chamber type, and three types of filter belts when intermittently moved. The belt vacuum filter is a horizontal filter surface, with the top of the filter, high filtration efficiency, good washing effect, filter cake thickness, and filter cloth At the same time washing, flexible operation, low maintenance costs, can be used in the chemical, pharmaceutical, food industry, for the sedimentation speed of faster sedimentation performance is excellent, when the cake needs to be washed more excellent.