What Are the Reasons for High Operating Resistance of Pulse Baghouse Dust Collectors?

The normal operating resistance of pulse baghouse dust collectors is generally 1200-1500Pa. If the resistance exceeds 1800Pa, it will affect the air volume, dust removal effect and energy consumption of the equipment, and even cause equipment failure. The main reasons for high operating resistance are divided into the following categories, which can be checked and handled according to the actual situation:

 1. Filter Bag Problems (Most Common Reason)
1. Filter bag blockage: The filter bag is blocked by dust, which is the main reason for high resistance. The causes include: high dust concentration exceeding the processing capacity of the dust collector; the dust has high viscosity, high humidity or easy agglomeration (such as sludge dust, chemical dust), which adheres to the filter bag and is difficult to clean; the filter bag is damp due to dew formation in the equipment, causing dust crusting and blockage.
2. Filter bag aging or damage: The filter bag is aged, brittle or damaged due to long-term use, high temperature, corrosion or excessive cleaning pressure, resulting in reduced air permeability and increased resistance; the damaged filter bag will cause dust leakage, and the dust will adhere to other intact filter bags, further increasing resistance.
3. Incorrect filter bag installation: The filter bag is folded, not installed tightly or the filter cage is deformed, resulting in uneven air flow through the filter bag, local dust accumulation and increased resistance.

2. Cleaning System Failure
1. Improper cleaning parameters: The spray pressure is too low (＜0.3MPa), which cannot effectively remove the dust on the filter bag surface; the cleaning frequency is too low, resulting in excessive dust accumulation on the filter bag; the spray time is too short (＜0.1s), and the dust cannot be completely cleaned.
2. Pulse valve or solenoid valve failure: The pulse valve does not act, acts intermittently or leaks air, resulting in uneven or ineffective spray; the solenoid valve is stuck or damaged, which cannot control the opening and closing of the pulse valve normally, affecting the cleaning effect.
3. Air bag or spray pipe problems: The air bag is blocked or leaks air, leading to unstable spray pressure; the spray pipe is blocked or deviated, unable to spray compressed air to each filter bag accurately, resulting in incomplete cleaning of partial filter bags.
4. Impure compressed air: The compressed air contains water, oil or impurities, which block the pulse valve and spray pipe, and adhere to the filter bag, causing filter bag blockage and increased resistance.

 3. Dust and Flue Gas Characteristics
1. High dust concentration: The dust concentration entering the dust collector is too high (exceeding 3000g/m³), exceeding the processing capacity of the dust collector and the cleaning system, resulting in excessive dust accumulation on the filter bag.
2. Dust particle size is too small: The dust particle size is too fine (≤0.5μm), which is easy to penetrate the filter bag and accumulate inside the filter bag, reducing air permeability and increasing resistance.
3. High flue gas humidity or dew formation: The flue gas humidity is too high (≥80%) or the equipment dew forms, causing the filter bag to damp, and the dust adheres to the filter bag to form a hard crust, which is difficult to clean and increases resistance.

 4. Air Intake and Exhaust System Problems
1. Air duct blockage: The air inlet or outlet duct is blocked by dust, debris or other impurities, resulting in poor air flow and increased system resistance.
2. Fan failure: The fan speed is reduced, the impeller is worn, unbalanced or blocked by dust, resulting in reduced air volume and increased system resistance; the fan rotation direction is incorrect, which cannot provide normal negative pressure.
3. Poor equipment sealing: The dust collector body, flower plate, air duct or ash discharge system has air leakage, which causes unfiltered dusty flue gas to bypass and enter the clean air chamber, adhering to the filter bag and increasing resistance.

5. Other Reasons
The ash hopper is full of dust and not discharged in time, resulting in dust backflow and accumulation on the filter bag; the number of filter bags is insufficient, and the air flow per unit area of the filter bag is too large, resulting in excessive dust accumulation.