May 8, 2025 · Environment · ShaktiPunj
Boilers, kilns and furnaces produce flue gas loaded with fine dust. Before that gas reaches the chimney, the dust must be removed to meet the emission limits set by the Central and State Pollution Control Boards. For large gas volumes, the Electrostatic Precipitator (ESP) remains one of the most reliable and energy-efficient choices.
How an ESP works
Discharge electrodes give the dust particles an electrical charge. The charged particles move towards the earthed collecting plates and stick to them. Rapping hammers periodically shake the plates and the dust falls into the hoppers below, from where it is conveyed away for disposal or reuse.
What affects ESP performance
- Dust resistivity, which depends on its chemistry, temperature and moisture
- Gas velocity and how evenly the gas is distributed across the fields
- Specific collection area provided for the gas volume being handled
- Condition of electrodes, rappers and the transformer-rectifier sets
- Air ingress through doors, hoppers and expansion joints
Common problems we see on site
Poor gas distribution
If the inlet screens are blocked or damaged, part of the ESP carries most of the gas and efficiency drops sharply. A gas distribution check is often the cheapest improvement available.
Hopper build-up
Dust that is not evacuated in time can bridge in the hoppers and short the electrodes. Hopper heaters, level indicators and a dependable ash handling system prevent this.
Upgrade or replace?
Many older ESPs can be brought within today's limits by adding a field, replacing internals or upgrading the controls, rather than replacing the whole unit. ShaktiPunj carries out performance assessments and prepares the technical specification, so clients can compare options on facts before investing.