- Equity Code ：832537
Electrostatic precipitators (ESPs) have served industrial dust control needs for decades, but tightening emission standards, fluctuating fuel quality, and aging equipment have pushed many plants to consider upgrade alternatives. Bag filter (fabric filter / baghouse) systems offer a proven path for ESP retrofit projects, delivering significantly higher particulate capture efficiency, often exceeding 99.9%, and far more stable performance regardless of dust resistivity or load variations that commonly affect ESP collection rates.
Stricter PM2.5 and opacity emission limits that existing ESPs cannot reliably meet
High-resistivity dust (e.g., from low-sulfur coal) reducing ESP collection efficiency
Aging ESP internals (electrodes, rappers, transformers) requiring costly maintenance
Process changes increasing dust loading beyond original ESP design capacity
Plant-wide environmental compliance upgrades tied to permit renewals
The existing ESP casing is removed and replaced with a new pulse-jet or reverse-air bag filter system, sized to match flue gas volume and dust characteristics. This option provides the highest performance gain and longest service life.
The original ESP shell and ductwork are reused where structurally sound, with internal components replaced by filter bags, cages, and a pulse-jet cleaning system. This approach reduces civil work and shortens installation downtime.
For projects with space constraints, a hybrid unit combines an upstream electrostatic field with downstream bag filtration, balancing pressure drop, energy consumption, and emission control.
Filter bags (PPS, PTFE membrane, fiberglass, or aramid depending on temperature and chemical conditions)
Cage supports and tube sheets engineered for the converted casing dimensions
Pulse-jet cleaning system with diaphragm valves and compressed air manifolds
Differential pressure monitoring and automated cleaning controls
Hopper and ash discharge system upgrades for higher dust loads
A successful ESP upgrade requires accurate flue gas analysis (volume, temperature, moisture, dust load, and chemical composition) to select appropriate filter media and system sizing. Structural assessment of the existing ESP casing determines whether reuse is feasible or full replacement is required. Installation scheduling is typically planned around plant outage windows to minimize production downtime, with modular pre-assembly used to reduce on-site work time.
For plants evaluating ESP upgrade options, a site-specific assessment helps determine the most cost-effective and compliant solution — whether full replacement, conversion, or hybrid configuration. Contact our engineering team to discuss flue gas data, site constraints, and emission targets for a tailored bag filter solution.
