{"id":6848,"date":"2019-04-24T20:52:53","date_gmt":"2019-04-24T17:22:53","guid":{"rendered":"http:\/\/shayansanaat.com\/en\/?p=6848"},"modified":"2021-06-08T11:35:39","modified_gmt":"2021-06-08T08:05:39","slug":"what-is-a-bag-filter-and-what-is-its-use","status":"publish","type":"post","link":"https:\/\/shayansanaat.com\/en\/what-is-a-bag-filter-and-what-is-its-use\/","title":{"rendered":"What is a bag filter and what is its use?"},"content":{"rendered":"
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What is a bag filter and what is its use?<\/h2>\n<\/div>\n
\"What<\/a><\/span><\/div>\n
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A bag filter is a container containing a number of bags made of polyester that settle the dust on the outer surface of the bags as the gas containing dust passes through the inlet valve and moves towards the outlet of the filter.\u00a0Then, at regular intervals by applying an air pulse, the dust on the bag is shaken and poured into the hopper under the filter.\u00a0In this way, the dust is separated from the gas.\u00a0Another equipment that is widely used for air dust removal in the cement industry are bag filters.\u00a0These types of filters have a high dust collection efficiency, which depending on the type of dust is up to 99.9% efficiency.\u00a0A factor that limits its use is the temperature of the inlet gas, with new advances in the production of bagged fibers, the scope of their use has become wider.<\/p>\n<\/div>\n

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With the new textile products, the bags can withstand temperatures above 200 \u00b0 C.\u00a0The following factors play a key role in bag filters:<\/p>\n

Material of bags used Degassing
\narea
\nBag structure and shape
\nType of bag dust system The
\nlast case that causes the industry to use pulsed-based dust collection systems.\u00a0In this type of bag filters, a pulsation of compressed air is done by injecting a pulse of compressed air in a short period of time.\u00a0These types of filters are widely used in various parts of the cement industry.<\/p>\n

Jet pulse filters mainly have six main parts, which are:<\/p>\n

Inlet duct and inlet chamber Dust-carrying gas with filter
\nFiber bag filter\u00a0Mesh
\nplate
\nPulse valves
\nBlower tubes to bags
\nExhaust chamber and duct of purified gases
\nDescription of operation process Bag filters<\/p>\n

The dust-carrying gas enters the filter and is returned by the baffle to the discharge hoppers.\u00a0Dusty gas enters one of the filter houses and the larger dust particles move towards the hopper after entering under the influence of their weight force and the rest accumulates on the filter bags.\u00a0The cleaning process of the bags begins when the dust has accumulated on the bags to such an extent that the flow is difficult to pass.<\/p>\n

The function of the inlet section is to reduce the gas velocity and allow large particles to fall freely to the hoppers under the filter, causing a uniform distribution of fine dust particles between the bags.\u00a0The gas distribution ensures that the gas flow on the bags does not cause excessive wear.<\/p>\n

The dust carrier gas goes to the bags and from there enters the cleaning air chamber and is then sent to the chimney by the suction fan.\u00a0At the same time as the above operation is performed continuously, the pulsed air is periodically blown into the bags periodically through the pulse valves and nozzles by the electrically programmed panel, causing the material to separate from the outer surface of the bags.\u00a0The separated material enters the harper and from there is directed out of the filter by transmission systems.<\/p>\n

Each row of filter bags is cleaned with a separate tube and nozzle installed at the top of the bags using compressed air.\u00a0For this purpose, compressed air tanks are cleaned.\u00a0For this purpose, compressed air tanks with complementary diaphragm valves are located at the end of each nozzle.\u00a0These diaphragm valves are opened and closed by selenoid valves which themselves operate periodically by an electronic controller.\u00a0The compressed air that comes out of the compressed air tank is blown into the bag through the nozzle blower tubes and the injector tube jet, which is installed just above the bags.\u00a0Due to the injector property, some clean chamber air is also sucked into the bags.\u00a0Even six-meter-long bags can be cleaned using this method.<\/p>\n

Compressed air pulse that cleans the bags compared to hammer hammer positive and negative electrodes in the electrodes due to the volume of related equipment, such as gearbox motors, hangers, positive and negative anvils, is not depreciated and to mechanical repairs and adjustments. No need to be exhausting.<\/p>\n

When using bag filters in dusting combustion gases and cleaning the cleaner, an important issue to consider is the amount of filter bags against high temperature gases.\u00a0With the changes in the technology of producing cleaners, the use of bag filters has undergone changes, the latest of which is lowering the temperature of the exhaust gases to a temperature of less than 200 \u00b0 C.\u00a0The use of bag filters dehumidifies gases up to 10 mg per cubic meter.<\/p>\n

\"A594ba9602b4b0b85c894533f490f2b5\"<\/p>\n

An important factor to consider when determining the area to be dusted is to determine the proper speed of the dusting operation that must be considered.\u00a0Bag filters are divided according to the type of cleaning method.\u00a0The cleaning of the bags is done online and offline. In the online mode, the chamber does not leave the production line and is still in the gas path, but in the offline mode, the chamber is separated from the production line and isolated again after the cleaning operation. It opens to the line.\u00a0Bags can be cleaned in three ways: reverse air method, air jet method, mechanical method.<\/p>\n

In the past, mechanical shaking and sometimes reverse air were used.\u00a0However, Pulse jet cleaning is currently used.\u00a0In pulse jet bag filters, cylindrical metal shelves called cages are used to prevent the bags from accumulating inside them.\u00a0The cage and bag hang vertically from a perforated plate called a tube.\u00a0To separate the layer of soil sitting on the outer surfaces of the bags, a high-pressure compressed air pulse is applied to the open mouth of the bags from above.\u00a0In other words, the dust that seeps into the filter bags is blown into the hoppers by fast, short air pulses.\u00a0Dust enters the transmission line to the production line through the hoppers under the filter.<\/p>\n

Baghouse
\nFilter The Baghouse Filter is the bag filter used in the production line process.\u00a0This type of filter has been used more in recent years to purify the exhaust gases from the main points of the production line and in some cases have replaced electric filters.\u00a0The main advantage of this type of filter is less impact of the exhaust dust by changing the characteristics of the inlet gas and easier access to less exhaust dust in the range of 10 mg per cubic meter.<\/p>\n

Baghouses come in a variety of shapes and sizes, and their base is similar to ordinary bag filters.\u00a0Baghouses are named after a series of woven and cloth bags woven into a metal enclosure, often made of Orlon nylon, acrylic, Dacron, Teflon, or fiberglass.\u00a0In general, it can be said that Baghouses can be found in all industries.\u00a0Industries such as cement, foundry and steel operations, pharmaceutical manufacturers, food manufacturers, chemical manufacturers and. Examples of this.\u00a0The use of Baghouses is constantly increasing and this is widespread in almost all countries of the world.\u00a0As mentioned, gas bag filter filters are passed through the filter cloth.\u00a0Dust particles settle on the surface of the fabric and the layer of dust that forms on the surface of the fabric is separated from the bag by shaking the fabric in different ways and enters the funnel.\u00a0In order for the dust on the bag not to cause a large pressure drop to pass the gas flow, a large fabric surface is needed, and in order for a large surface of the fabric to fit in a limited space, the filter cloth is turned into a cylindrical bag. It is called a cylinder in a baghouse.\u00a0The size of a baghouse depends on the volumetric flow rate of the gas and the ratio of the volume flow rate of the gas to the surface of the fabric or A \/ C.\u00a0A \/ C depends on gas concentration, temperature, cleaning method and level of filter technology.<\/p>\n

The most important advantages of using pulse jet filters are:<\/p>\n

High user efficiency
\nLow user costs
\nResistance to flammable gases, explosive dust particles and\u2026
\nEasy to use
\nDurability, long life of bags
\nPulse jet filters have the following disadvantages:<\/p>\n

High resistance to gas flow
\nLow efficiency against wet gases
\nThe temperature limit of the inlet gases due to the material of the bags is
\nsuitable for use and the high efficiency of the bag filters depends on the correct choice of the filter and the correct principles of installation, equipment and use.\u00a0Poor performance of such filters is due to the following factors:<\/p>\n

Improper installation equipment (wrong configuration of the intake system, a bug in the system shake dust from the bags, improper installation bags)
\nincorrect selection of filter (low capacity dust Fyltrnsbt area)
\nusing appropriate sex bags with
\nhigh humidity gas inlet
\nThe type of bag used is selected based on the process characteristics of the gas, temperature, humidity, type of gas and the amount of dust particles.\u00a0The fabric used to dust the exhaust gases from the kiln of raw materials of cement production lines is usually made of fiberglass with membrane coating and made of PTFE, which can withstand temperatures up to 260 \u00b0 C.\u00a0The presence of membrane prevents the entry of fine dust particles into the fabric and prevents the increase of pressure drop between the ends of the bags during operation.\u00a0But in any case, the pressure drop between the two ends of the bag filters is between 12 to 15 millibars, which is one of the weaknesses of bag filters.\u00a0Another disadvantage of the bag filter is the fabric temperature tolerance limit of 260 \u00b0 C.\u00a0If the temperature rises above this value, the fabric will be unusable.\u00a0Cooling towers are also commonly used in bag filters to reduce temperature.\u00a0Lowering the temperature to 260 \u00b0 C is sufficient for the fabric to be tolerable.\u00a0However, because the decrease in temperature reduces the volumetric flow of gas and thus reduces the required surface of the fabric, for this reason, in bag filters, the temperature is set in the range of 150 to 200 \u00b0 C.\u00a0The most important advantage of the bag filter is that the dust collection efficiency and the amount of dust output do not change significantly with changing temperature, humidity and gas volume.\u00a0Bags are made of different materials and the following should be considered when choosing a bag:<\/p>\n

Gas temperature
\nMoisture content of dust
\nElectrical nature of dust particles
\nCorrosion rate of dust particles
\nAcid and alkali resistance of fabric Fabric
\nability to get rid of dust layer
\nAbility of fabric in air permeability
\nDust particle size
\nBag price
\nin design of fabric dust collectors In addition to inlet gas conditions, the following are also fashionable Comments are:<\/p>\n

Pressure drop, vertical velocity of gas between bags and ratio of air to fabric surface<\/p>\n

Pressure drop Pressure
\ndrop is one of the most important parameters in the design of fabric filters.\u00a0This parameter represents the resistance of the filter fabric against the passage of gas flow.\u00a0Pressure drop is measured in millibars, milligrams or millimeters of water.\u00a0To measure the pressure drop in fabric filters, the total pressure is measured at two points, which are usually the inlet and outlet of the filter:<\/p>\n

Dusting speed and air to fabric ratio<\/p>\n

The two words dusting speed and air to fabric ratio can be used interchangeably.\u00a0The air to fabric ratio is defined by the ratio of air entering the filter per cubic meter per minute to the filtration rate per square meter.\u00a0The units measured by A \/ C are:<\/p>\n

m\/min, cm\/s<\/p>\n

Higher this ratio means a higher volume of air or gas that is from the surface of the filter cloth.<\/p>\n

Vertical gas velocity between bags<\/p>\n

The vertical velocity of the gas between the filter bags in a bag filter is called Can velocity.\u00a0The unit of measurement of this speed is m \/ min and other common units are ft \/ min and cm \/ sec.\u00a0In filters using the online method, dust particles separated from the surface of the bags during the cleaning operation must move downwards under the influence of their weight force in the filter environment.\u00a0If the upward velocity of the inlet gas does not exceed the downward velocity of the fall of these particles, the particles return to the dust surface and overshadow the filter operation.<\/p>\n

Comparison between bag filter and electrofilter<\/p>\n

Approximate comparison of the cost of electrofilters and bag filters as the most widely used filters in the industry.\u00a0For example, whenever the cost of a bag filter is assumed to be 100 units, an electro-filter device with the same capacity of 400 units is considered.<\/p>\n

Electrofilters are one of the best tools for air purification, removal of pollutants, dust and soot.\u00a0This method has a high efficiency in removing pollutants, dust and soot.\u00a0It also has high efficiency in removing toxic compounds of carbon monoxide, nitrogen oxides, formaldehyde and toxic gaseous compounds.<\/p>\n

Features and function of hybrid filters Hybrid
\nfilters are one of the types of dust collection systems that combine electrofilter and bag filter technology.\u00a0The resulting system is durable and cost-effective and has a high dusting power.\u00a0The design of this type of filter with the simultaneous use of the two technologies mentioned above, has made it possible to design with a higher air-to-filtration ratio in the bag.\u00a0This reduces the surface area of \u200b\u200bthe fabric and as a result the number of bags, the number of gauges, the valves related to the percussion system in the bag part.\u00a0Reducing the number of these parts ensures greater efficiency and durability of the device and lower maintenance costs.\u00a0Although electrofilters have high mechanical strength and temperature resistance, they can be very expensive when the output is less than 10 mg \/ m3.<\/p>\n

Electrofilters have a lower pressure drop than bag filters in different volumes of gas.\u00a0Also, the filter bag can separate more dust than the electrofilter and work independently of gas and dust conditions, but they are sensitive to temperature.\u00a0If increasing the efficiency of the filter is intended by increasing the efficiency of the cement production line, the electrofilter will be very expensive.\u00a0Converting an electrofilter to a bag filter requires a new, more fatherly fan than the previous electrofilter fan.\u00a0Therefore, in order to increase the efficiency of dust collector systems and use the advantages of electrofilters and bag filters simultaneously, the idea of \u200b\u200bcombining the above two systems led to the production of composite or hybrid filters in the family of dust collectors.\u00a0The interaction of two electrofilter and bag filter systems in a single system has increased the efficiency of the system in the absorption of fine dust particles and the formation of an integrated, stable and economical system.<\/p>\n

Description of hybrid filter operation<\/p>\n

In a hybrid filter, two methods of dusting are used simultaneously.<\/p>\n

Dust absorption using electrostatic force in the electric field
\nDust separation using filter cloth in the hybrid filter bag.
\nTaking advantage of the two methods of dusting, it actually creates a synergy between the above two functions, which results in very valuable results.<\/p>\n

The hybrid filter consists of an electrical part and a separate bag section, both of which are housed in the same compartment.\u00a0The electrical part is similar to an electric field electrofilter, and the bag part consists of a set of bags that is almost identical to a bag filter.\u00a0The gas stream first enters the electrical part and under the influence of the electrostatic field, about 90 to 95% of the dust is absorbed by the plates.\u00a0The remaining dust particles enter the bag and settle on the surface of the bag.\u00a0These charged particles form a layer of dust on the bags with a porous space that facilitates the passage of gas through the dust layer.\u00a0This makes the pressure drop much lower than the bag filter, despite the fact that the gas passing through the fabric of the hybrid filters is much faster than the bag filter, which results in the possibility of using less fabric surface for a certain volume of gas (A \/ C). ) is.<\/p>\n

Advantages of using a hybrid system<\/p>\n

Excellent particle adsorption efficiency of more than 99.99% of
\nbags in this system due to protection against
\nsettling of large particles has a longer service life and higher efficiency.
\nSmaller equipment size due to the use of 65 to 75% of conventional bag filter equipment and a percentage of use of conventional electrofilter components
\n. Optimal energy consumption
\n, maintenance and upgrade of the system due to no need to add control parameters
\nas previously provided in filters The hybrid is that due to the absorption of most of the dust in the electrical part, much less dust load will enter the bag section, which will reduce the frequency of sending cleaning pulses and, consequently, increase the life of the bags, increase the life of Diaphragm and pilot. Valve as well as reducing the consumption of compressed air.<\/p>\n

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