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Electro Static Precipator
Anagha Electro Static Preciprator:

Electrostatic precipitators use electrostatic forces to separate dust particles from exhaust gases. A number of high-voltage, direct-current discharge electrodes are placed between grounded collecting electrodes. The contaminated gases flow through the passage formed by the discharge and collecting electrodes. Electrostatic precipitators operate on the same principle as home "Ionic" air purifiers

The airborne particles receive a negative charge as they pass through the ionized field between the electrodes. These charged particles are then attracted to a grounded or positively charged electrode and adhere to it.

The collected material on the electrodes is removed by rapping or vibrating the collecting electrodes either continuously or at a predetermined interval. Cleaning a precipitator can usually be done without interrupting the airflow.

The four main components of all electrostatic precipitators are:
  • Power supply unit, to provide high-voltage DC power
  • Ionizing section, to impart a charge to particulates in the gas stream
  • A means of removing the collected particulates
  • Housing to enclose the precipitator zone

The following factors affect the efficiency of electrostatic precipitators:
  • Larger collection-surface areas and lower gas-flow rates increase efficiency because of the increased time available for electrical activity to treat the dust particles.
  • An increase in the dust-particle migration velocity to the collecting electrodes increases efficiency. The migration velocity can be increased by:
    • Decreasing the gas viscosity
    • Increasing the gas temperature
    • Increasing the voltage field

Types of precipitators
There are two main types of precipitators:
  • High-voltage, single-stage - Single-stage precipitators combine an ionization and a collection step. They are commonly referred to as Cottrell precipitators.
  • Low-voltage, two-stage - Two-stage precipitators use a similar principle; however, the ionizing section is followed by collection plates.

Described below is the high-voltage, single-stage precipitator, which is widely used in minerals processing operations. The low-voltage, two-stage precipitator is generally used for filtration in air-conditioning systems.

Plate precipitators
The majority of electrostatic precipitators installed are the plate type. Particles are collected on flat, parallel surfaces that are 8 to 12 in. (20 to 30 cm) apart, with a series of discharge electrodes spaced along the centerline of two adjacent plates. The contaminated gases pass through the passage between the plates, and the particles become charged and adhere to the collection plates. Collected particles are usually removed by rapping the plates and deposited in bins or hoppers at the base of the precipitator.

Tubular precipitators
Tubular precipitators consist of cylindrical collection electrodes with discharge electrodes located on the axis of the cylinder. The contaminated gases flow around the discharge electrode and up through the inside of the cylinders. The charged particles are collected on the grounded walls of the cylinder. The collected dust is removed from the bottom of the cylinder.

Tubular precipitators are often used for mist or fog collection or for adhesive, sticky, radioactive, or extremely toxic materials.

Electro static precipators can be used for removal of fumes, smoke & fine dust, from Welding, EDM, Induction hardening, Ink spray, Heat treatment, Oil quenching, Wire drawing, Annealing, Soldering, Dip tinning, Wave soldering, Rubber curing, Die casting, Oil mist, Coolant mist, Diesel gensets. Fumekiller can also be used for capturing fine powder from tabletting, capsuling and finishing operations.

  • High filter efficiency
  • Low running cost.
  • Filter modules are washable, reusable.
  • No replacement required.
  • Safety features incorporated for reliable and efficient working.
  • A safer, healthier working environment where hazardous fumes and airborne contaminants are removed.
  • Complete factory support and product expertise based on years of industrial process emission control.

How It Works

Electro Static Precipator
Particles in fumes, smoke & dust stream enter the electrostatic filter through the suction inlet (1). Particles carried by the air stream first enter the Pre-Filter (2) where large particles are removed. The remaining particles then enter the electrostatic module (3) where, between a series of parallel aluminium plates, they receive a high +ve charge. These positively charged particles then pass through another series of aluminium plates which are negatively charged. Here, the particles are attracted to the oppositely charged aluminium plates and stick to them just like iron filings are attracted to a magnet, but, with one difference, the particles remain adhered to the plates even when the electrostatic filter is switched off. The air, now devoid of particles, escapes through the outlet (5) of the system as clean air. The Post Filter (4) evenly distributes the air flow through the electrostatic modules. Post filters when fitted with activated carbon granules can control odour & smell. Suction is provided with a centrifugal fan (6)
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