How to troubleshoot boiler dust collectors?

Troubleshooting of boiler dust collectors is a key step in ensuring their normal operation. The following are detailed troubleshooting steps and methods:

1、 Run parameter check

1. Pressure parameters

-First, check the pressure difference between the inlet and outlet of the dust collector. Under normal circumstances, the pressure difference should be within a reasonable range, which is determined by the type, design parameters, and actual operating conditions of the dust collector. For example, the normal pressure difference of a bag filter is generally around 1-2kPa. If the pressure difference suddenly increases, it may be caused by clogged filter bags. At this point, it is necessary to check whether the filter bag has accumulated too much dust, whether it has become damp and compacted, or whether there are foreign objects entering the filter bag.

-At the same time, attention should also be paid to the pressure of the induced draft fan. Abnormal pressure of the induced draft fan may indicate poor airflow inside the dust collector, such as pipeline blockage or fan failure. If the pressure of the induced draft fan drops, it may be due to pipeline leakage or damage to the fan impeller, resulting in insufficient air flow.

2. Temperature parameters

-For boiler dust collectors under high temperature conditions, such as in coal powder boiler systems, temperature monitoring is crucial. Excessive inlet temperature of the dust collector may damage internal components such as filter bags. If the temperature exceeds the tolerance temperature of the filter bag, it will cause the material of the filter bag to age, deform, or even burn out. Therefore, it is necessary to check whether the temperature sensor is accurate and whether the abnormal temperature rise is due to abnormal combustion of the boiler or the heat dissipation problem of the dust collector itself.

-In addition, the outlet temperature of the dust collector also needs to be monitored. If the outlet temperature is too low, condensation may occur, which will cause dust to adhere to the filter bag, increase the resistance of the filter bag, and affect the dust removal efficiency.

2、 Inspection of equipment appearance and connection parts

1. Dust collector body

-Check for signs of deformation, cracks, or corrosion on the outer casing of the dust collector. Damage to the casing may lead to air leakage, affecting the negative pressure environment of the dust collector and reducing dust removal efficiency. For example, in a dust collector using carbon steel material, if the outer shell is corroded and perforated, external air will enter the interior of the dust collector, disrupting the normal airflow organization.

-Check if the sealing parts of the dust collector's maintenance door, observation window, etc. are well sealed. If these parts are not sealed tightly, air leakage may also occur, leading to dust leakage and a decrease in dust removal efficiency. The sealing condition can be checked by observing whether the sealing strip is intact and whether the fastening bolts are loose.

2. Pipeline connection

-Check whether the connection between the inlet and outlet pipelines of the dust collector and the boiler and other equipment is firm. Loose pipelines may cause leaks at the interface and also generate vibrations, affecting the stability of the equipment. For pipelines connected by flanges, check if the flange gaskets are intact and if the bolts are tightened.

-Check whether there is dust accumulation or blockage inside the pipeline. It can be judged by tapping the pipeline to listen for sound or using detection tools. Pipeline blockage can obstruct airflow, leading to an increase in pressure difference between the inlet and outlet of the dust collector, which affects normal ventilation and dust removal.

3、 Internal component inspection

1. Filter bag inspection (for bag filter)

-Regularly open the dust collector to check the condition of the filter bag. Check if the filter bag is damaged, perforated, or worn. Damaged filter bags can cause a large amount of dust leakage, reducing dust removal efficiency. It can be preliminarily judged by observing the distribution of dust on the surface of the filter bag. If it is found that the amount of dust in a certain area is significantly higher than in other areas, it may indicate that the filter bag in that area is damaged.

-Check if the installation of the filter bag is correct and if the sealing of the bag opening is good. Poor sealing of the bag opening can cause dust containing gas to leak from the bag opening, bypassing the filter bag and directly entering the clean air chamber.

2. Electrode inspection (for electrostatic precipitators)

-For electrostatic precipitators, check for dust accumulation, deformation, or abnormal discharge on the electrodes. Electrode dust accumulation will reduce the electric field strength and affect the dust removal effect. The accumulation of dust can be determined by observing the thickness and distribution of dust on the electrode surface. Electrode deformation may be caused by equipment vibration, high temperature, or electric field force. The deformed electrode can lead to uneven electric field, abnormal discharge, such as flashover, and reduce dust removal efficiency.

4、 Inspection of control system and ancillary equipment

1. Control system

-Check if the control system of the dust collector is working properly. Check whether the control signals are accurately transmitted to various equipment components, such as valve opening and closing, fan speed adjustment, etc., and whether they are carried out according to the set program. If the control system malfunctions, it may cause the operating parameters of the dust collector to become disordered, affecting the dust removal effect.

-Check whether the electrical components are damaged, short circuited, or overloaded. For example, damage to components such as relays and contactors may cause the equipment to fail to start or stop properly.

2. Auxiliary equipment

-Check if the ash discharge device of the ash hopper is working properly. If the ash hopper is not discharged smoothly, it may cause excessive dust accumulation, which may cause deformation or even damage to the ash hopper. For systems that use screw conveyors for ash discharge, check if the screw shaft rotates normally and if there are any foreign objects stuck; For the pneumatic conveying ash discharge system, check whether the conveying pipeline is unobstructed and whether the pressure of the pneumatic conveying is normal.