Air Pre Filtration Primary Effect Plate Air Filters
Air Pre Filtration Primary Effect Plate Air Filters It is widely used, and as the pre-filtration of medium and high-efficiency air filters, the effect is very obvious. It can effectively extend the service life of medium and high-efficiency air filters and reduce costs to a great extent. It can be seen that the primary effect plate air filter as a pre-filter is an important part of the filtration system.
In a complete set of hierarchical filtration systems, the primary effect plate filter is an indispensable component to ensure that the final filtered air can meet higher purity requirements. The application of primary effect plate filter in this aspect is as a coordination function, and the working environment it adapts to is also in some places with high purity requirements for impurity content in the air, such as sterile operating rooms, precision electronics Equipment or instruments, production of edible products, etc.
Why use a primary-effect plate filter that can accommodate larger filter particles in a filtration system instead of directly using a medium-efficiency or high-efficiency filter? First of all, in addition to the most basic air filtration function of the primary-effect plate filter, using the primary-effect plate filter The reason why the efficient plate filter is also due to its relatively low cost, compact structure and light weight makes the primary effect plate filter applicable to a wider range of fields. But in fact, the primary effect plate filter also has its own role. The primary effect plate filter can filter air dust particles and suspended matter particles larger than 5um. Another way to say it is that primary-effect plate filters are suitable for places that have certain requirements for air impurity content but relatively low standards. They are widely used in primary-effect filtration of air-conditioning systems. It can also be used as air conditioning equipment or ventilation systems that require lower filtration levels. Therefore, among the various reasons why primary effect plate filters are so widely used, in addition to being a high-quality and low-cost pre-filter device for air filtration systems, they are also essential for a high-grade complete air filtration system. Few primary filtration devices. Whether in terms of economy or energy efficiency, it can be clearly seen that the important position of the primary effect plate filter is.
Characteristics and replacement of plate-type primary air filter:
There are currently a wide range of primary-efficiency filters, among which plate-type disposable filters and plate-type primary-efficiency filters are more popular. It has strong versatility, is not expensive, and more importantly, has a compact structure and can be used in many environments.
Common applications of plate primary air filters are central air conditioning, in addition to clean return air systems and large air compressor pre-filtration systems. It mainly plays the role of primary filtration, so its structure is relatively simple. At present, there are many varieties. In addition to the common G1, G2, and G3, there are also nylon mesh filters or activated carbon filters, which are replaced by GN and GC respectively.
The structure of the plate-type primary air filter is very distinctive. From the appearance, it uses a waterproof plate. The overall shape is very strong. The placed filter material has been folded, and it pays special attention to the diagonal design. The reason for this treatment is to increase the filtering area and ensure the filtering effect. After the above treatment, the outer frame will be close to the internal filter material, and the connection between the two is very good. It uses special glue and there will be no air leakage at all, even in the face of too high wind resistance pressure. , there will be no problem.
When people learn about plate-type primary air filters, they will also come into contact with disposable paper frame filters. Some manufacturers use ordinary cardboard frames, while others use die-cut cardboard. This kind of cardboard is characterized by relatively high strength, and the filter element is also very unique. It not only uses a single-sided metal mesh, but also adds It has a special lining and all the fibers are pleated. It looks very nice from the outside. The structure is very strong and will not break.
How does the primary filter work?
The working principle of the primary filter is based on the principle of air purification and filtration. A clean environment is formed in a specific space when clean air (filtered air) flows in a set direction. According to the direction of air flow, the existing primary effect filters can be divided into many types. The primary effect filters are G1 G2 G3 G4.
From the perspective of operating quality and impact on the environment, primary efficiency filters are superior. The clean air provided by the air supply filter plate falls through the operating area at a specific speed, splits approximately in the middle of the operating area, and is sucked away by the front air suction hole and the rear suction window.
What is a plate primary filter? What is the function?
After the primary filter has been used for a period of time, it can be cleaned with an air gun and reused to save operating costs. Mesh wire mesh or galvanized iron frame is used to support the filter material, which can meet the operating wind speed requirements of each ventilation system. Aluminum frame, strong and lightweight, easy to install and remove filter media, reasonable design, high dust holding capacity, low resistance, can be cleaned and reused, saving costs. Wide range of wind speeds, suitable for many occasions. Efficiency levels: G3, G4, M5. Scope of application: Primary-effect plate filters are widely used in the primary-effect filtration section of industrial, commercial, and civil building ventilation systems because of their reusability, easy installation, low resistance, and high dust holding capacity.
First of all, the primary filter has small running resistance and good decontamination and purification effect. When cleaning dust, the acceleration on the surface of the filter bag is much greater than that of other types of equipment. The dust cleaning is more uniform and the effect is very good. The cost of the equipment is low. Due to the high filtration load, the amount of treatment is large, the structure is also very compact, and it occupies a small area. It is very convenient to replace the filter bag. It is very convenient to install and replace the filter bag in the equipment, and there is no need for the operator to enter the inside of the box. Due to the above-mentioned characteristics, primary effect filters are available in a wide range of sizes and specifications.
The specifications of primary filter include plate primary filter and bag primary filter. From the shell material point of view, there are paper frames, galvanized frames, and aluminum frames, and the strength is gradually increasing. Principle of primary filter: The filter material is packed into high-strength cardboard in a folded form. The windward area increases, and the dust particles in the inflowing air are effectively blocked by the filter material between the folds. Clean air flows out evenly from the other side. Therefore the air flow through the filter is smooth and even. It depends on the filter material. The diameter of the particles it intercepts varies from 0.5um to 5um. Filtration efficiency is also different.
Brief discussion on the style and principle of primary filter
The outer frame of the washable primary filter mainly includes paper frame, galvanized frame, aluminum frame, stainless steel, etc. Air filter filter material: fiber filter material mainly includes chemical fiber non-woven fabrics, and others include nylon mesh, metal mesh, etc. .
Within the ventilation system, a complete set of air filter equipment can effectively improve the air quality inside the entire clean room. It can be said that almost all clean rooms, dust-free rooms and laboratories will use primary filters, although it There are many types, but the primary effect plate filter must be that special one. The primary effect plate filter has product features that other filters do not have. Its filter screen is reinforced ribs, and its material is made of polyester synthetic fiber, which is fluffy and gradually The dense fiber structure ensures a high dust collection rate and a large dust holding capacity, effectively extending the service life of its rear-end medium-efficiency filter and reducing operating costs.
The main working principle of the primary filter is that when the equipment is working normally, there is an air inlet at the front end, which will suck in all the air around it, and then enter the gate inside the filter, inside the air filter cylinder, It will initially remove all large solid particles in the air. Then it will enter the second pass inside it - the filtration of the air filter. After excluding some large solid particles, the air will be purified again, removing all the fine particles, dust and bacteria. Filter it cleanly, so that you can ensure that the air entering the cylinder is completely clean. Maintenance of the front filter (usually the back cover of the chassis). It is advisable to clean the pre-filter 1-2 times a month. Remove the filter, pat it or blow it clean with a hair dryer. You can even wash it with clean water and spin it dry before installing it into the panel.
Primary filter is the category chosen by most people, not only because of its product features, but also because of its high quality and low price. It can be found in almost every office environment, which is why it is so popular among people. Reason, at the same time, as a manufacturer of primary effect filters, we recommend that when purchasing filters, you should choose based on the principle of quality, otherwise the filter efficiency will be reduced and the load will be increased.
What are the common filter materials for primary filters in purification plants?
The primary filter in the purification plant is a common filter. It is usually used for primary filtration in air purifiers, air conditioning systems, mechanical equipment and other fields. The filter material of the primary filter is usually made of non-woven fabrics, activated carbon and other materials. It has high cost performance and service life. Here are some common types of primary filters, which can be divided into the following types according to different materials:
The most commonly used primary filter in purification plants is non-woven fabric, which has good air permeability and filtration efficiency. It can effectively filter dust, pollen, bacteria and other tiny particles in the air. This kind of filter has a longer service life and is relatively cheap. It is a relatively economical and practical primary filter.
Activated carbon material has good adsorption performance and filtration efficiency. It can effectively absorb odors, harmful gases and tiny particles in the air. This kind of filter has a short service life and needs to be replaced regularly. It is suitable for some places where odors and harmful gases need to be purified.
Another type of filter material for the primary filter in the purification plant is a metal filter, which is usually made of stainless steel, aluminum alloy and other materials with a mesh structure and has high support strength, high temperature resistance and corrosion resistance. It can effectively filter tiny particles and harmful gases in the air. This kind of filter has a long service life and a relatively high price. It is suitable for some places that require high temperature and high corrosion resistance.
Air filters are recognized by more and more people. They improve air quality and ensure people's health. They are widely used. For example, medicine, food and other industries are inseparable from various efficient filters.
The primary filter is suitable for primary filtration of air conditioning systems and is mainly used to filter dust particles above 5μm. There are three types of primary filters: plate type, folding type, and bag type. The outer frame materials include paper frames, aluminum frames, and galvanized iron frames. The filter materials include non-woven fabrics, nylon mesh, activated carbon filter materials, metal mesh, etc., and protection The nets include double-sided spray-coated wire mesh and double-sided galvanized wire mesh.
Characteristics of primary filter: low price, light weight, good versatility and compact structure. Mainly used for: pre-filtration of central air-conditioning and centralized ventilation systems, pre-filtration of large air compressors, clean return air systems, pre-filtration of local high-efficiency filtration devices, high-temperature-resistant air filters, with stainless steel frames, high temperature resistance 250-300℃ Filtration efficiency.
Filters of this efficiency are commonly used as primary filtration in air conditioning and ventilation systems, and are also suitable for simple air conditioning and ventilation systems that only require primary filtration.
G series coarse-efficiency air filters are divided into eight varieties, namely: G1, G2, G3, G4, GN (nylon mesh filter), GH (metal mesh filter), GC (activated carbon filter), GT (high temperature resistance) coarse filter).
The outer frame of the filter is composed of a strong waterproof board, which is used to fix the folded filter media. The diagonal design of the outer frame can provide a large filtering area and allow the internal filter material to adhere tightly to the outer frame. The surroundings of the filter are bonded to the outer frame with special professional adhesive glue to prevent air leakage or damage caused by wind resistance pressure.
The outer frame of the disposable paper frame filter is generally divided into general cardboard frame and high-strength touch-cut cardboard. The filter element is a pleated fiber filter material lined with a single-sided metal mesh. Beautiful appearance. The structure is sturdy and durable. Generally, the cardboard outer frame is used to manufacture non-standard specifications of filters. It can be used to produce filters of any specifications. It has high strength and is not suitable for deformation. High-strength cardboard is used to manufacture standard specifications of filters, which are characterized by high specification accuracy, beautiful appearance and low cost. If imported surface fiber or synthetic fiber filter materials are used, all performance indicators can reach or exceed the imported filter materials.
The filter material is folded into high-strength cardboard to increase the windward area. Dust particles in the inflowing air are effectively blocked between pleats by the filter material. Clean air flows out evenly from the other side, so the airflow through the filter is gentle and even. Depending on the filter material, the particle size it blocks varies from 0.5μm to 5μm, and the filtration efficiency is also different!
Choose a filter with a large filtering area.
The larger the filtration area, the lower the filtration rate, and the smaller the filter resistance. Under specific filter structural conditions, the rated air volume of the filter reflects the filtration speed. Under the same cross-sectional area, it is hoped that the larger the rated air volume allowed, the better. When operating below the rated air volume, the efficiency increases and the resistance decreases. At the same time, increasing the filter area is the most effective way to extend the service life of the filter. Experience shows that for filters of the same structure and the same filter material. When the final resistance is determined, the filtering area increases by 50% and the service life of the filter is extended by 70% to 80%. However, when considering increasing the filter area, the structure and site conditions of the filter must also be taken into consideration.
Reasonably determine the efficiency of filters at all levels.
When designing an air conditioner, you should first determine the efficiency of the last stage filter based on actual requirements, and then select a protective pre-filter. It is necessary to properly match the efficiency of filters at all levels, and be good at utilizing and configuring the optimal filtration particle size ranges of coarse and medium-efficiency filters. The selection of pre-filter should be determined based on comprehensive considerations such as the use environment, spare parts costs, operating energy consumption, maintenance costs and other factors. The minimum count filtration efficiency of air filters of different efficiency levels for dust particles of different sizes is shown in Figure 1. It usually refers to the efficiency of a new filter without static electricity. At the same time, the configuration of the comfort air conditioning filter should be different from that of the purification air conditioning system, and different requirements should be put forward for the installation and leakage prevention of the air filter.
The resistance of the filter mainly consists of the resistance of the filter material and the resistance of the filter structure. The resistance of the filter due to dust accumulation increases. When the resistance increases to a certain specified value, the filter will be scrapped. The final resistance is directly related to the service life of the filter, the system air volume change range, and the system energy consumption. The gaps between fibers are large, and excessive resistance may blow away the dust accumulated on the filter, causing secondary pollution. At this time, the resistance no longer increases and the filtration efficiency is zero. Therefore, the final resistance value of filters below Air Pre Filtration Primary Effect Plate Air Filters must be strictly limited.
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