Bag filter What is the reason for the high differential pressure

There can be a number of reasons why the pressure difference (i.e., the pressure difference between the inlet and outlet airstreams) in a baghouse is too high, and here are a few of the possible causes:

Excessive filter bag resistance: Reduced filter bag surface area or damaged filter bags can lead to excessive filter bag resistance, which can increase the pressure difference between the inlet and outlet airflows.

Blocked air inlet or outlet: When the air inlet or outlet is blocked, the airflow cannot pass smoothly, increasing the pressure difference between the inlet and outlet airflow.

Insufficient fan speed: Insufficient fan speed will lead to insufficient air volume, which will increase the pressure difference between the inlet and outlet airflow.

Bag Collector Cleaning System Failure: Failure of the cleaning system will lead to a decrease in the cleanliness of the filter bag, which will increase the filter bag resistance and increase the pressure difference between the inlet and outlet airflow.

Increase in airflow temperature: When the airflow temperature increases, the density of the gas decreases due to the gas expansion effect, which increases the pressure difference between the inlet and outlet airflows.

The above are some of the reasons that may lead to the high differential pressure of the bag filter, and the specific reasons need to be analyzed and judged according to the specific situation.

The high differential pressure of the bag filter is a general reason caused by the increase of the resistance of the dust collector. It is caused by the blockage of the dust bag. Check if the dust bag is clogged, and check if the cleaning system is normal.

The bag material of the pulse bag filter does not match the dust characteristics, resulting in some porosity blockage. For dust with large concentration, small particle size, high humidity and viscosity, a coated dust bag should be selected.

The relevant parameters of the pulse injection system are set improperly, and the cleaning effect of the electrostatic precipitator is poor. If the time interval of the pulse injection of the bag, the width of the pulse injection or the pressure of the compressed air is too low, the tension of the dust bag will be reduced, and the dust accumulation on the dust bag will be too thick, and the relevant parameters of the pulse injection system should be reset.

The bag has been used for too long, resulting in increased resistance Problems with the ash cleaning system, resulting in poor ash cleaning results Bag clogging caused by condensation.

Analysis of the causes of large negative pressure of dust collector: main causes and elimination methods:

1) Wrong differential pressure reading: Clean the pressure measurement interface, check whether there is a crack in the trachea, and check the differential pressure gauge.

2) Incorrect injection setting: Increase the frequency of injection compressed air.

The pressure is too low; Increase the pressure Check the dryer and clean it up (if needed) Check for blockages in the line.

3) Failure of the injection valve: check the diaphragm valve and check the control solenoid valve.

4) Pulse controller failure: check whether the controller indicates each contact Check each terminal.

output. 5) Filter bag blockage: condensation on the filter bag (see below); The filter bag is sent to the laboratory for analysis of the cause.

Filter bag drying and cleaning treatment or replacement Reduce air volume Increase compressed air pressure Increase cleaning frequency Spray in neutral modulating powder to form a protective layer and porous and loose primary cake.

6) Excessive secondary dust: continuous emptying of the ash hopper and the cleaning of each row of filter bags and filter cartridges are cleaned in a random sequence, rather than in sequence. Check the inlet baffle to make sure it's clean.

How to deal with the high pressure difference of the bag filter Hello The pressure difference of the bag filter is large, and the following measures can be taken: Cause check: (1) The bag ash is too much, which can be vibrated and cleaned many times, and the bag is blocked (the inlet humidity is too large or the ignition oil has not burned off the adhesive bag) is more troublesome, depending on the load of the induced draft fan, which may reduce the load operation or cause downtime.

Treatment measures: The filter chamber can be temporarily removed, the ash transfer can be accelerated, and the ash delivery power can be used to blow back the filter chamber. (2) The ash cleaning device of the bag filter loses its due function, so that the dust layer attached to the surface of the bag becomes thicker and thicker, resulting in a sudden increase in pressure difference.

Hope mine is helpful to you, thank you and have a great day!

Summary. Hello dear! Glad for your question!

Why is the pressure difference of the bag filter particularly low: The reason why the pressure difference suddenly becomes low is that the bag of the dust collector is damaged and leaks. In the same way, if the dust collector bag is damaged, there is no way to achieve the original purification effect.

It can be said that the differential pressure is a kind of air pressure control that controls the electromagnetic pulse valve to spray the dust on the dust bag of the dust collector. Therefore, if you want to recycle the dust collector equipment, it is important to stabilize the differential pressure. If it is a new cloth bag that has been put into operation for less than one month, it is normal for the pressure difference to be low, and the pressure difference of the dust collector needs to be operated normally for one month before it has reference value; If it is an old cloth bag after one month of normal operation, there is a sudden low pressure difference

Observe whether the dust index exceeds the standard, if the dust index exceeds the standard, it may be that the bag is damaged or falls off; If the dust index does not exceed the standard, check whether the bypass is not opened normally, and whether the net smoke chamber of the dust collector is leaking.

Hello dear! Glad for your question! The differential pressure of the bag filter is particularly low why:

The reason for the sudden drop in differential pressure is that the dust collector bag is damaged and leaks. In the same way, if the dust collector bag is damaged, there is no way to achieve the original purification effect. It can be said that the differential pressure is a kind of air pressure control that controls the electromagnetic pulse valve to spray the dust on the dust bag of the dust collector.

Therefore, if you want to recycle the dust collector equipment, it is important to stabilize the differential pressure. If it is a new cloth bag that has been put into operation for less than one month, it is normal for the pressure difference to be low, and the pressure difference of the dust collector needs to be operated normally for one month before it has reference value; If it is an old cloth bag after one month of normal operation, there is a sudden low pressure difference: observe whether the dust index exceeds the standard, if the dust index exceeds the standard, it may be that the cloth bag is damaged or falls off; If the dust index does not exceed the standard, check whether the bypass is not opened normally, and whether the net smoke chamber of the dust collector is leaking.

Now there is no pressure difference, and the pressure difference is around minus 100pa.

In general, it refers to the difference between the flue gas pressure before the bag and the pressure after passing through the bag, which is used to characterize the parameters of the bag to the flue gas resistance, such as a large pressure difference, which proves that there is more dust on the bag, and the resistance to the flue gas is large, prompting the operator to carry out mechanical vibration and other measures to shake off the dust, and the excess pressure difference is particularly small, then it is possible that the bag is burned out, and it cannot play a role in dust removal,,, probably like this, what is not clear and ask again!! Have a great day!!

Summary. Hello, the reason for the large pressure difference is that the dust collector bag and induced draft fan are not suitable, and the applicable performance of the filter bag is not considered in the early stage of the dust collector design, resulting in the increase of the overall pressure difference of the system.

Hello, the reason for the large pressure difference is that the selection of the dust collector bag and the induced draft fan is not suitable, and the applicable performance of the filter bag is not considered in the early stage of the combustion disturbance of the dust collector Huishan design, which leads to the increase of the overall pressure difference of the system.

Solution: Conduct an overall investigation of the system problem, eliminate and calculate the wind pressure of the induced draft fan and the resistance of the pipeline system, and select the appropriate filter material or replace the fan. Reason 2 for the large pressure difference:

The dust adhesion is strong under the dust working condition condition, and the phenomenon of pasting bags is caused to the dust collector cloth bag, and the existing ash cleaning system can not achieve the ash cleaning effect, and the pressure of the dust collector of the part increases, and the pressure difference is too large. The third reason for the large pressure difference: the configuration of the dust collector system is too low, and the automatic ash cleaning is not timely.

Solution: upgrade the dust collector configuration system, to increase the system timing, muchang constant pressure, manual three cleaning methods, according to the relevant nature of the dust, to adjust the timing time, regularly check the reason for the large pressure difference four: the filter wind speed is too high, the concentration in the dust is too high, and the filter wind speed of the filter bag at this time is also high, resulting in the filter bag pressure difference is too high.

The large pressure difference of the bag filter proves that the running resistance is large, what is going on, we analyze it step by step:

1.Check the pipes for dust accumulation.

2.Whether the dust filter bag is clogged.

3.Whether the cleaning system is working properly.

4.Whether the ash discharge system is normal.

5.Whether the chamber off-line cylinder is normal.

Starting from the above five points, you can solve the problem of large pressure difference of bag filter.

The following four aspects can be checked to analyze the problem of large differential pressure in the bag filter:

The solenoid valve relay voltage is insufficient.

The poppet model is on the small side.

The bag filter has the problem of air leakage.

Water accumulates in the air tank of the bag filter.

Bag filter.