Filter Bag Clogging

1. 8 Core Causes of Filter Bag Clogging, Caking and High Pressure Difference

1. Excessive Working Humidity Leading to Dew Condensation and Dust Adhesion

Excessive water vapor in flue gas or materials, as well as large day and night temperature differences, easily cause dew condensation inside the equipment. Dry dust becomes highly adhesive after absorbing moisture, firmly attaching to the filter bag surface and cannot be removed by conventional pulse cleaning. Long-term accumulation forms hard caking, reduces fabric air permeability and sharply raises system pressure difference.

2. Oil and Water Contaminated Air Source Weakens Cleaning Effect

Insufficient air compressor maintenance and missing post-stage purification equipment result in oil and water mixed in compressed air. During pulse jetting, contaminated air brings oil stains into filter fabric pores, forming oily dust deposits that cause stubborn clogging. This is one of the leading causes of persistent filter bag caking.

3. Mismatch Between Filter Bag Material and Working Conditions

General polyester and polypropylene filter bags are often improperly used under high-temperature, acid-base and corrosive environments. Such materials lack qualified temperature resistance, corrosion resistance and waterproof performance. The fibers easily harden, shrink and block micropores, allowing dust to embed deeply into the fabric. This leads to rapid clogging and rising operating resistance.

4. Improper Parameter Settings of Pulse Cleaning System

Excessively long cleaning intervals, insufficient jet pressure and unreasonable pulse width lead to incomplete dust removal and gradual dust caking on bag surfaces. On the contrary, overly frequent cleaning wears down filter fibers and embeds fine dust deeper, creating a vicious cycle of blockage.

5. Ultra-Fine Dust Easily Blocks Fabric Micropores

Industries such as pharmaceutical processing, precision manufacturing and ore grinding produce a large proportion of ultra-fine dust. The particle size is far smaller than filter pores, allowing dust to penetrate surface fibers and embed inside the fabric. Conventional pulse cleaning cannot remove embedded fine dust, resulting in continuous growth of filtration resistance.

6. Air Leakage and External Moisture Infiltration

Poor sealing of dust removal boxes, access doors and pipe interfaces causes cold and humid outside air to enter the equipment. Mixing with high-temperature internal airflow leads to dew condensation and worsens filter bag caking and clogging, especially in humid seasons and low-temperature working environments.

7. Improper Installation Causes Dead-Area Dust Accumulation

Skewed filter bags, poor bag mouth sealing and deformed filter cages cause disordered local airflow and uncleaned dead zones. Continuous dust accumulation forms local caking, which gradually spreads to the entire filter bag and chamber, resulting in overall high system pressure difference.

8. Inadequate Long-Term Maintenance Accelerates Dust Deposition and Aging

Lack of systematic equipment maintenance leads to accumulated water and oil in air tanks, blocked nozzles and aging or leaking pulse valve diaphragms. Insufficient and uneven pulse cleaning causes progressive dust caking on filter bags and eventually complete blockage and failure.

2. Practical and Complete Solutions

1. Humidity Control and Anti-Condensation Treatment: Stabilize flue gas humidity, equip the equipment with thermal insulation in low-temperature environments, seal all air leakage points and prevent external humid air infiltration to reduce adhesive dust formation at the source.

2. Purify Pulse Cleaning Air Source: Install refrigerated dryers and high-precision oil-water separators after air compressors. Regularly drain accumulated water and oil from air tanks to ensure dry and clean jet air and eliminate oily caking.

3. Select Filter Bags According to Actual Working Conditions: Adopt PTFE or PPS filter bags for high-temperature and corrosive conditions, oil-water repellent filter bags for humid and oily environments, and high-density microporous filter fabrics for ultra-fine dust filtration to achieve optimal condition adaptability.

4. Optimize Pulse Cleaning Parameters: Adjust pulse interval, jet pressure and pulse duration according to actual dust concentration and fineness. Maintain a scientific cleaning cycle to ensure thorough dust removal without damaging filter fabric.

5. Standardize Installation and Regular Inspection: Replace deformed filter cages, install filter bags correctly with tight bag mouth sealing to eliminate cleaning dead zones. Regularly inspect pulse valves and jet pipelines, and replace aging diaphragms in a timely manner.

6. Establish Regular Maintenance Mechanisms: Carry out offline cleaning for clogged filter bags and remove internal equipment dust regularly. Predict aging and blockage risks in advance to avoid severe equipment shutdown failures.

3. Conclusion

Filter bag clogging, caking and high pressure difference are rarely caused by product quality defects. They are systematic problems resulting frommismatched filter materials, unqualified air sources, unreasonable cleaning parameters and insufficient maintenance. Through accurate material selection, air source purification, parameter optimization and standardized maintenance, enterprises can completely solve frequent filter bag blockage problems, stabilize system pressure difference, reduce energy consumption and replacement costs, and effectively extend filter bag service life.

Contact：Yanice Yu

Whatsapp/ Wechat ID: +8617852092959

Email: Yanice@starmachinechina.com