How to prevent clogging of high temperature heat pump dryer bag

How to prevent clogging of high temperature heat pump dryer bag

The main reason for the clogging of the dust collector bag of the high temperature heat pump dryer is that the filtering wind speed is too large, the dust is too fine, the dust is sticky, the dust bag is not cleaned, and the dust bag is damp. How to prevent the dust bag from being blocked? What kind of effective measures?

　　 If the filter wind speed of the dust collector exceeds the design standard of the dust bag, it will easily cause the fine dust in the airflow to get stuck inside the fiber of the dust bag. As a result, clogging of the dust cloth bag occurs. It is a good way to use coated filter material or pre-cover the surface of the dust bag with a protective powder layer.

For high-temperature heat pump dryers to produce highly viscous dust, it is necessary to reduce the filter air speed, or increase the pulse blowing pressure, or use the offline pulse cleaning method to clean the dust bag, but the better way is to increase the filter Area to reduce the filter air speed of the dust collector and prolong the service life of the dust bag.

　　 The main reasons for the poor cleaning of the dust bag include: the frequency of cleaning is too frequent and the cleaning time is too long. Frequent cleaning times will easily cause the fiber structure of the dust removal bag to loosen and increase the fine dust in the exhaust gas to block the dust removal bag. If the cleaning time is too long, the initial powder layer on the surface of the dust removal bag will be washed away. If the dust removal time is too short and the dust on the surface of the dust bag has not been completely cleaned, the filter will start immediately. The dust will gradually accumulate on the surface of the dust bag, which will cause the dust bag to block. To solve this problem, you can pass several times Test run for adjustment.

　　The reason why the dust bag of the high temperature heat pump dryer is damp: The compressed air used for dust removal is too cold. In order to prevent the dust bag from getting damp, in cold areas, the compressed air used for dust removal can be increased for heat preservation, heating, oil removal, and water removal. After the dust collector stops, the dust removal will continue for 10-20 minutes. Moisture is the biggest reason for the blockage of the dust bag. The cause of moisture is usually condensation at low temperature, especially when dealing with combustion or high-temperature flue gas. For such situations, the following measures need to be taken to prevent:

　　 1. Avoid improper booting.

2. Avoid turning on the dust collector when the resistance is large: turn it on when it is below the dew point; restart it when there is condensation on the surface of the dust bag after the dust collector is stopped. At this time, a large amount of dusty air will enter, and high humidity will cause the dust bag The surface is muddy. To prevent this from happening, the dusty air at the inlet of the dust collector should be preheated or the dust layer should be pre-coated.

3. Do not let the dust collector of the high-temperature heat pump dryer start below the dew point: the dust collector of the high-temperature heat pump dryer runs below the dew point, which is prone to problems. If the air intake is unevenly distributed, it is easy to cause local corrosion of the dust collector shell Therefore, the dust collector should be avoided from working below the dew point, and the device with heat preservation should be used.

4. Prevent the air infiltration of the dust collector of the high temperature heat pump dryer: Air infiltration often occurs in the flange of the dust collector, the inspection door or the movable device of the dust collector. If the sealing is not tight, the outside air enters the dust collector. When processing high temperature exhaust gas, It will produce a low temperature zone inside the dust collector, which will cause condensation at low temperatures, corrode the dust collector, and cause dampness and blockage of the dust collector.