Several methods of cleaning dust for small dust collectors:
1. Small dust collector vibrating cleaning method Use mechanical device to beat or shake the frame of the hanging filter bag to make the filter bag vibrate and clear the dust. The round bag applies vibration at the top to make vertical or horizontal vibration. , or both vertical or horizontal vibrations at the same time, the position where the vibration is applied also has a position in the middle of the filter bag. Since the dust is raised when cleaning, the chamber cleaning system is often used for vibration cleaning, that is, the entire dust collector is divided into A number of bag chambers are sequentially cleaned by chamber to maintain the continuous operation of the small dust collector. The bag chamber for cleaning is used to automatically cut off the air flow by using a valve to prevent dusty air from entering. Vibrate and clean, the vibration can be hundreds of times per minute, so that the dust falls into the ash bucket. The intensity of the vibration cleaning can be expressed by the maximum acceleration of the vibration, and the square of the cleaning intensity and the vibration frequency is proportional to the product of the amplitude. However, when the vibration frequency is too high, the propagation of vibration to the entire filter bag is insufficient, but a suitable range is available. When using a vibration motor, the vibration frequency is generally 20-30 times / s, the amplitude is 20-50mm, the amplitude is reduced, the frequency is increased, the damage of the filter cloth can be reduced, and the vibration can be transmitted to the entire filter bag. For highly adherent dust, it is necessary to increase the amplitude and reduce the tension of the filter bag to enhance the destructive force on the deposited dust layer. The mechanical structure of the vibration cleaning method is simple and reliable, but the cleaning effect is weak, and it is suitable for the textile cloth filter bag.
2. The small dust collector backflushing method is also called backflushing or reverse pressure cleaning. This method uses the compartmentalization system. The valve is automatically adjusted to generate airflow in the direction of the filtered airflow. The backflushing method uses an internal filter type. Due to the reverse flow and back pressure, the cylindrical filter bag is compressed into a star-shaped section and causes reverse wind speed and vibration to cause the deposited powder layer dust to fall off. Because it is an internal filter type, it is necessary to adjust the tension of the filter bag appropriately so that the deformation of the filter bag shrinks too much. To this end, a metal ring is added at a certain distance in the longitudinal direction of the filter bag to control the deformation of the filter bag, so that the cleaning effect is evenly distributed to the entire filter bag. During the cleaning, more than two cleaning operations of backflushing are carried out. Most of the cleaning methods use a woven cloth filter such as a 729 filter cloth, and a filter-type filter material can also be used for dust that is relatively easy to clear. The reverse airflow is generated by closing the outlet side valve, opening the reverse blow valve, and inhaling the gas from the atmosphere or the fan discharge pipe to form a reverse flow: for the positive pressure type, closing the ash inlet side valve and opening the reverse blower The valve, which is drawn into the atmosphere by the inlet duct to the fan, forms a reverse flow. In order to increase the anti-blowing effect, there are also forms of special small fans. The anti-blowing cleaning method has a weaker cleaning effect, and the damage effect on the filter cloth is smaller than that of the vibrating cleaning method. Therefore, the glass fiber filter cloth mostly adopts the cleaning method.
3. Small dust collector pulse spray cleaning method The perforated plate (flower plate) for fixing the filter bag is arranged on the upper part of the tank, and there is a blow pipe above each filter bag, and the spray pipe is opposite to each filter bag. The center opens a compressed air injection hole (mouth), and the other end of the injection pipe is connected with a pulse control system composed of a pulse valve and a control valve, and a compressed air storage tank, and is pulsed according to an automatic control program according to a prescribed time or resistance value. Spray off the ash. The filter bag is mostly made of an outer filter type, and the inner side is provided with a support skeleton, and the dust is trapped and settles on the outer surface of the filter bag. At the moment of cleaning, when the high-speed jet airflow passes through the top of the filter bag, it can induce several times the air of the jet volume, and blow it together into the inside of the filter bag to form an air wave, which causes the filter bag to expand sharply from top to bottom. Impact vibration, which produces a strong clear dust. The pulse period can be adjusted, typically from 1 minute to a few minutes. According to the flow direction of the pulse blowing airflow and the purifying airflow, there are three types of flow-through type, reverse-injection type and counter-injection type. The flow direction is the same for the two airflow directions. After the purification, the clean air is discharged from the bottom of the filter bag: the spray type actually divides the filter bag into two parts, one half is sprayed and the other half is sprayed. When spraying, the dust-filtered filter bag does not catch dust. Because the spraying time is very short, and the filter bag is sprayed and cleaned for the first time in a row and row, the dust-collecting operation can be regarded as almost Continuously, it is possible to take a compartmental structure for off-line cleaning, or to perform online cleaning without a compartment. The pulse cleaning effect is stronger, the cleaning effect is better, and the filtering wind speed can be improved. The strength and frequency are adjustable, and the cleaning effect is related to the atmospheric pressure venturi structure and whether the jet centerline and the filter bag centerline are consistent. When the filter bag is long, a good cleaning effect can be obtained by using a better blowing device. Because of the strong cleaning effect, it is also effective for the viscose filter. The use of felt filter materials has also begun to increase. The felt filter material can be used for effective filtration from a microscopic point of view, so that the apparent filtration speed can be higher than that of the woven fabric, thereby miniaturizing the device. The pulse blowing device requires compressed air as the energy source. In the cold zone, the water vapor in the compressed air is easy to condense and affect the blowing effect. Therefore, it should not be placed outdoors to take corresponding technical measures to prevent condensation or freezing the bag filter. Dust bag
1. Small dust collector vibrating cleaning method Use mechanical device to beat or shake the frame of the hanging filter bag to make the filter bag vibrate and clear the dust. The round bag applies vibration at the top to make vertical or horizontal vibration. , or both vertical or horizontal vibrations at the same time, the position where the vibration is applied also has a position in the middle of the filter bag. Since the dust is raised when cleaning, the chamber cleaning system is often used for vibration cleaning, that is, the entire dust collector is divided into A number of bag chambers are sequentially cleaned by chamber to maintain the continuous operation of the small dust collector. The bag chamber for cleaning is used to automatically cut off the air flow by using a valve to prevent dusty air from entering. Vibrate and clean, the vibration can be hundreds of times per minute, so that the dust falls into the ash bucket. The intensity of the vibration cleaning can be expressed by the maximum acceleration of the vibration, and the square of the cleaning intensity and the vibration frequency is proportional to the product of the amplitude. However, when the vibration frequency is too high, the propagation of vibration to the entire filter bag is insufficient, but a suitable range is available. When using a vibration motor, the vibration frequency is generally 20-30 times / s, the amplitude is 20-50mm, the amplitude is reduced, the frequency is increased, the damage of the filter cloth can be reduced, and the vibration can be transmitted to the entire filter bag. For highly adherent dust, it is necessary to increase the amplitude and reduce the tension of the filter bag to enhance the destructive force on the deposited dust layer. The mechanical structure of the vibration cleaning method is simple and reliable, but the cleaning effect is weak, and it is suitable for the textile cloth filter bag.
2. The small dust collector backflushing method is also called backflushing or reverse pressure cleaning. This method uses the compartmentalization system. The valve is automatically adjusted to generate airflow in the direction of the filtered airflow. The backflushing method uses an internal filter type. Due to the reverse flow and back pressure, the cylindrical filter bag is compressed into a star-shaped section and causes reverse wind speed and vibration to cause the deposited powder layer dust to fall off. Because it is an internal filter type, it is necessary to adjust the tension of the filter bag appropriately so that the deformation of the filter bag shrinks too much. To this end, a metal ring is added at a certain distance in the longitudinal direction of the filter bag to control the deformation of the filter bag, so that the cleaning effect is evenly distributed to the entire filter bag. During the cleaning, more than two cleaning operations of backflushing are carried out. Most of the cleaning methods use a woven cloth filter such as a 729 filter cloth, and a filter-type filter material can also be used for dust that is relatively easy to clear. The reverse airflow is generated by closing the outlet side valve, opening the reverse blow valve, and inhaling the gas from the atmosphere or the fan discharge pipe to form a reverse flow: for the positive pressure type, closing the ash inlet side valve and opening the reverse blower The valve, which is drawn into the atmosphere by the inlet duct to the fan, forms a reverse flow. In order to increase the anti-blowing effect, there are also forms of special small fans. The anti-blowing cleaning method has a weaker cleaning effect, and the damage effect on the filter cloth is smaller than that of the vibrating cleaning method. Therefore, the glass fiber filter cloth mostly adopts the cleaning method.
3. Small dust collector pulse spray cleaning method The perforated plate (flower plate) for fixing the filter bag is arranged on the upper part of the tank, and there is a blow pipe above each filter bag, and the spray pipe is opposite to each filter bag. The center opens a compressed air injection hole (mouth), and the other end of the injection pipe is connected with a pulse control system composed of a pulse valve and a control valve, and a compressed air storage tank, and is pulsed according to an automatic control program according to a prescribed time or resistance value. Spray off the ash. The filter bag is mostly made of an outer filter type, and the inner side is provided with a support skeleton, and the dust is trapped and settles on the outer surface of the filter bag. At the moment of cleaning, when the high-speed jet airflow passes through the top of the filter bag, it can induce several times the air of the jet volume, and blow it together into the inside of the filter bag to form an air wave, which causes the filter bag to expand sharply from top to bottom. Impact vibration, which produces a strong clear dust. The pulse period can be adjusted, typically from 1 minute to a few minutes. According to the flow direction of the pulse blowing airflow and the purifying airflow, there are three types of flow-through type, reverse-injection type and counter-injection type. The flow direction is the same for the two airflow directions. After the purification, the clean air is discharged from the bottom of the filter bag: the spray type actually divides the filter bag into two parts, one half is sprayed and the other half is sprayed. When spraying, the dust-filtered filter bag does not catch dust. Because the spraying time is very short, and the filter bag is sprayed and cleaned for the first time in a row and row, the dust-collecting operation can be regarded as almost Continuously, it is possible to take a compartmental structure for off-line cleaning, or to perform online cleaning without a compartment. The pulse cleaning effect is stronger, the cleaning effect is better, and the filtering wind speed can be improved. The strength and frequency are adjustable, and the cleaning effect is related to the atmospheric pressure venturi structure and whether the jet centerline and the filter bag centerline are consistent. When the filter bag is long, a good cleaning effect can be obtained by using a better blowing device. Because of the strong cleaning effect, it is also effective for the viscose filter. The use of felt filter materials has also begun to increase. The felt filter material can be used for effective filtration from a microscopic point of view, so that the apparent filtration speed can be higher than that of the woven fabric, thereby miniaturizing the device. The pulse blowing device requires compressed air as the energy source. In the cold zone, the water vapor in the compressed air is easy to condense and affect the blowing effect. Therefore, it should not be placed outdoors to take corresponding technical measures to prevent condensation or freezing the bag filter. Dust bag
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