A. There is a baffle: the manufacturing process is simple, and the windward side is dozens of times that of the filter end face. The partition is generally made of aluminum (pure aluminum is not allowed, and aluminum alloy is generally used). It's best not to use paper for partition, because paper is flammable. In military and medicine (because paper is a nutrient), paper partition can be used for civilian use. There are also some plastic partitions at present. In the military, high-efficiency filters with baffles must be used, and aluminum baffles must be used.
B, how to choose a high efficiency filter without partition and how to choose a suitable high efficiency air filter.
1) high efficiency filter for clean room. The high efficiency filter is mainly difficult to detect its efficiency.
A、
There is a partition: the manufacturing process is simple, and the windward side is dozens of times that of the filter end face. The partition is generally made of aluminum (pure aluminum is not allowed, and aluminum alloy is generally used). It's best not to use paper for partition, because paper is flammable. In military and medicine (because paper is a nutrient), paper partition can be used for civilian use. There are also some plastic partitions at present. In the military, high-efficiency filters with baffles must be used, and aluminum baffles must be used.
B, no partition: separate the filter materials with silk thread. Compared with the filter with baffle, the height of the filter can be reduced under the same filtering area. Can withstand high temperature.
2) Detection of high efficiency filter
The traditional method is to use DOP, which is an oily liquid plastic. It is heated and condensed into 0.3μm droplets. The filtration efficiency is determined by the light scattering mirror.
99.97% domestic high efficiency filters are tested by sodium ion method. Using scanning detection, every high-efficiency filter needs to detect leakage, and the scanning cost is high, but the qualified rate is low, and the qualified rate of 100% is impossible. The rejection rate of the best manufacturers in China is 5%, and the poor ones all reach 40%. The rejection rate abroad is 3%. However, many domestic manufacturers do not test every set, and only domestic manufacturers such as Jianqiao and Yanjing are fully tested.
3) Intermediate filter
The most efficient filter is the bag filter. Generally, it is also made of glass, silk and cotton. Not all need to be tested. The recommended size is 24 inches X24 inches.
4) Clean room:
The filters used in 10000 and 100000 clean rooms are generally the same, but the air exchange times and fresh air ratio are different. Generally, this kind of clean room rarely uses fresh air system. Sub-high efficiency filter can meet the terminal requirements of 654.38+ 10,000-class clean room, but it is not recommended because of the small price difference between sub-high efficiency filter and high efficiency filter. However, the air exchange times of sub-high efficiency filter need 20 times/hour, while the air exchange times of high efficiency filter only need 654.38+00 times/hour. This saves the initial investment and operating costs. Economic choice.
How to choose a good high-efficiency filter At present, the most advanced technology is membrane technology, such as RO membrane, but the technology is not very mature. Actually, activated carbon can be filtered. Simple and cheap.
How to choose high efficiency filter specifications? , how to choose an efficient filter? There are many kinds and specifications of high-efficiency filters, and the choice depends on the purpose and conditions of filtration. Therefore, in order to formulate and implement a safe, economical, reliable and effective purification and filtration scheme, the following factors should be fully considered. 1. Influencing factors of high-efficiency filtration type and filtration accuracy: filtration purpose: clarification, sterilization, concentration and separation. Selection: microfiltration, ultrafiltration, nanofiltration and filtration accuracy. Sterilization: 0.2μm or 0.45μm for particle removal: macromolecular separation and selection 1~60μm: molecular weight1000 ~ 300,000; small molecular separation and selection ultrafiltration: molecular weight 200~ 1000; and nanofiltration. 2. Influencing factors of filter material: filter fluid characteristics: gas or liquid, fluid composition. Selection: refer to the chemical compatibility table and the selection of filter material characteristics. When filtering liquid, the transmission window should try to use hydrophilic filtering materials, such as polyethersulfone membrane and nylon membrane. When filtering gas, strong acid, strong alkali and special solvent, PTFE filter material is selected. 3. Influencing factors of filter shell: filter fluid characteristics: gas or liquid, fluid composition, chemical properties, temperature and process requirements, etc. Choice: 304 or 3 16L stainless steel can be selected. The sanitary shell is used for sterilization and filtration; Use fewer or no threads; Polishing, using diaphragm pressure gauge. 4. Factors affecting the size of high efficiency filter: flow rate, liquid viscosity, working mode and selection content: determined according to effective pressure difference, initial pressure difference and filtration capacity. If the liquid has viscosity, it needs to be increased because of the viscosity and flow ratio of the liquid. Continuous operation is at least larger than intermittent operation 1/3. Select an item: Whether a pre-high efficiency filter is required; Influencing factors: pollution degree, particle distribution and pretreatment; Selection: The use of appropriate pre-high efficiency filter can prolong the service life of the terminal high efficiency filter and reduce the use cost. If you want to choose a good and efficient filter, you must first understand its classification: 1, air filters used in constant temperature and humidity air conditioners, including: plate disposable paper frame filters; Plate metal frame filter 2, air filters used in air conditioning and ventilation industry in large buildings and public places, including plate air filters, bag air filters, sub-high-efficiency box air filters, activated carbon and catalytic decomposition chemical filters 3, and various primary, medium and high-efficiency filters used by users in clean room industry with clean registration requirements. Include plate air filter, bag air filter, high-capacity combined air filter, box air filter with partition, plate air filter without partition, spray top cotton, glass fiber oil mist felt, plate air filter, bag air filter, plate air filter for high surface coating industry, bag air filter, high-capacity combined air filter, cylinder air filter for clean workshop, etc.
How to choose Guangzhou Hengzhiyu Purification Technology to engage in the production, processing and sales of R&D and air purification products? Because of the different characteristics of clean rooms, the selection of high-efficiency filters should first be determined according to the different requirements of clean rooms, such as grade, sterility, temperature and humidity, fire resistance and corrosion protection. Recently, I saw Hengzhiyu high-efficiency filter in BOE's clean workshop, which requires high temperature resistance, moisture resistance and corrosion resistance.
For example, choose Class A or Class B below 100, and choose Class C filter above 100; Under the condition of high temperature and high humidity, metal partition and metal frame filter should be selected; If there are anti-corrosion requirements, plastic partitions and plastic frame filters should be selected; If there is a fire protection requirement, all the materials of the filter will not burn, and so on.
In practice, conventional filters refer to Class A and Class B specified in the standard of high efficiency air filters, and are the most commonly used high efficiency filters in clean plant design. Generally, if it is less than or equal to 654.38+ 10,000, you can choose Class A. Grade10,000 ~100 can be selected as grade B. The efficiency of conventional high-efficiency filters for particles ≥0.5μm can be calculated as 5 "9s" or 0.9999.
High-efficiency filter is mainly used to filter suspended particles below 0.3um, as the end filtration of various filtration systems;
Discussion on the selection and configuration of air filters in clean areas of 300,000, 1 10,000 and 100 clean rooms. Generally speaking, the choice of filter is based on the requirements of clean room.
Guangzhou Hengzhiyu Purification suggests that the configuration requirements of high-efficiency filters are as follows for your reference:
100 purification: flat G4(F5)+ bag F7(F8)+ bag F9+ flat H 13+ (FFU filter unit at the end of air duct);
1000 level purification: plate G4(F5)+ bag F7(F8)+ bag F9+ plate H 1 1+ (FFU filter unit at air duct end);
10000 purification: plate G4(F5)+ bag F7(F8)+ bag F9+ plate H11;
100000 purification: flat G3(G4)~ F5+ bag F7(F8)+ bag F9;
300,000-level purification: plate G3 ~ F5+ bag F6 ~ F8；;
Each HEPA filter is tested one by one before leaving the factory to ensure the performance index of HEPA filter.
How to choose the pre-filter of high efficiency filter to prolong its service life? Now, let's explain the functional characteristics of the inefficient filter:
Medium efficiency filter is mainly used for air purification and filtration in electronics, precision instruments, machinery, metallurgy, chemical industry, textile, medicine, food and other industries; Intermediate filter of air conditioning system. Used to collect particulate dust and various suspended substances above 1~3μm; Large air volume; Small resistance; Large dust holding capacity; Reusable;
Primary filters are generally used for pre-filtration of multi-stage filtration systems; Air filtration in general acid-base organic solvents; Primary filtration of air conditioning system. It is mainly used to collect particulate dust and various suspended substances above 5μm; Large air volume; Small resistance; High dust holding capacity; Long service life.
The most commonly used method to protect high-efficiency air filters is to select G4 level for primary filtration efficiency and F7-F9 level for intermediate filtration efficiency. 1-3 months later, the primary filtration must be replaced or cleaned, and the intermediate filtration must be replaced after 3-6 months. As long as the relevant rules are observed, the service life of the high efficiency filter can be effectively extended.
How to choose high efficiency filter in clean room? Because of the different characteristics of clean rooms, the selection of high-efficiency filters should first be determined according to the different requirements of clean rooms, such as grade, sterility, temperature and humidity, fire resistance and corrosion protection. Recently, I saw the high-efficiency filter of Rfilter in BOE's clean workshop, which requires high temperature resistance, moisture resistance and corrosion resistance.
For example, choose Class A or Class B below 100, and choose Class C filter above 100; Under the condition of high temperature and high humidity, metal partition and metal frame filter should be selected; If there are anti-corrosion requirements, plastic partitions and plastic frame filters should be selected; If there is a fire protection requirement, all the materials of the filter will not burn, and so on.
In practice, conventional filters refer to Class A and Class B specified in the standard of high efficiency air filters, and are the most commonly used high efficiency filters in clean plant design. Generally, if it is less than or equal to 654.38+ 10,000, you can choose Class A. Grade10,000 ~100 can be selected as grade B. The efficiency of conventional high-efficiency filters for particles ≥0.5μm can be calculated as 5 "9s" or 0.9999.
High-efficiency filter is mainly used to filter suspended particles below 0.3um, as the end filtration of various filtration systems;
Discussion on the selection and configuration of air filters in clean areas of 300,000, 1 10,000 and 100 clean rooms. Generally speaking, the choice of filter is based on the requirements of clean room.
Rfilter suggests that the configuration requirements of high-efficiency filters are as follows for your reference:
100 purification: flat G4(F5)+ bag F7(F8)+ bag F9+ flat H 13+ (FFU filter unit at the end of air duct);
1000 level purification: plate G4(F5)+ bag F7(F8)+ bag F9+ plate H 1 1+ (FFU filter unit at air duct end);
10000 purification: plate G4(F5)+ bag F7(F8)+ bag F9+ plate H11;
100000 purification: plate G3(G4)~ F5+ bag F7(F8)+ bag F9;
300,000-level purification: plate G3 ~ F5+ bag F6 ~ F8；;
Each high efficiency filter is tested one by one before leaving the factory to ensure the performance index of the high efficiency filter;
What should I do if the air output of high efficiency filter is small? Check whether the filter resistance is reached. If not, check the small filter resistance in the ventilation system to see if it is time to replace it.
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How to calculate the price of high efficiency filter? Characteristic description of high efficiency and fast fiber ball filter
1. The modified fiber ball has small diameter, large specific surface area, and the specific surface area is as high as 2000 ㎡/g ... Because the fiber diameter is smaller, the porosity of the superimposed filter layer is smaller, while the porosity of the superimposed filter layer is over 80%, which is superior to other filter materials in intercepting suspended matter. Therefore, it is especially suitable for injection water treatment of low permeability reservoirs. It is more suitable for the discharge and reuse of high suspended solids water.
2. The fiber silk was modified to make it hydrophilic and oleophobic. No matter whether pure oil or oily sewage sticks to the modified fiber silk, water molecules can penetrate the surface of the modified fiber silk when meeting water, forming a water film to separate the fiber silk from the oil. When backwashing, the crude oil attached to its surface can be cleaned, and the backwashing regeneration performance is particularly good.
Mechanical filtration is the most commonly used method for sewage treatment. According to the different filtering media, mechanical filtering equipment can be divided into two types: particle media filtering and fiber filtering. Granular media filtration mainly uses granular filter materials such as sand and gravel as filter media, and realizes filtration through the adsorption of granular filter materials and the interception of solid suspended solids in water by pores between sand grains. The advantage is that it is easy to recoil, but the disadvantage is that the filtration speed is slow, generally not more than 7 m/h; The amount of sewage interception is small, and the core filter layer only has the surface of the filter layer; The filtration accuracy is low, only 20-40μm, which is not suitable for rapid filtration of high turbidity sewage.
The core technology of high-efficiency automatic gradient density fiber filter is to use asymmetric fiber bundle material as filter material, one end is loose fiber bundle, and the other end is fixed in high specific gravity solid. When filtering, the heavy solid core plays the role of compacting the fiber bundle. At the same time, due to the small size of the filter element, it has little influence on the uniformity of the gap distribution in the cross section of the filter layer, thus improving the pollution interception ability of the filter layer. The filter bed has the advantages of high porosity, small specific surface area, fast filtration speed, large sewage interception and high filtration accuracy. When the suspended matter in water flows over the surface of fiber filter material, under the action of van der Waals gravity and electricity, the adhesion between the suspended matter and fiber bundle is much greater than that with quartz sand, which is beneficial to improve the filtration speed and accuracy.
How to Choose a Good Efficient Filter Cangzhou Weber Environmental Protection Technology Co., Ltd. is an ISO 9001:2008/GBT19001:2029 certified enterprise, specializing in the production, processing and sales of R&D and air purification products. Specializing in the production of all kinds of air filters, products cover all kinds of primary filters, intermediate filters, high efficiency filters, activated carbon filters and so on. In addition, we have also acted as agents for the crater-type film thickness meter of AB in Sweden and the coating measurement system CMS of AB in Sweden, which are specially used to measure the coating thickness of color coated plates. Welcome new and old customers to call!