How does Cottrell precipitator work?

How does Cottrell precipitator work?

Hint:As we know that Cottrell’s precipitator is a filtration device which basically removes the fine particles such as smoke and dust from a flowing industrial waste gas by the use of a force of an induced electrostatic charge where dust and smoke are attracted towards positively charged wire electrode.

How is electrostatic precipitator used?

Originally designed for recovery of valuable industrial-process materials, electrostatic precipitators are used for air pollution control, particularly for removing harmful particulate matter from waste gases at industrial facilities and power-generating stations.

How does an electrostatic precipitator work what type of appliances use this technology?

An electrostatic precipitator is a type of filter (dry scrubber) that uses static electricity to remove soot and ash from exhaust fumes before they exit the smokestacks. This one common air pollution control device. Most power stations burn fossil fuels such as coal or oil to generate electricity for use.

How does ESP work in power-plant?

A dry electrostatic precipitator (ESP) electrically charges the ash particles and imparts a strong electric field in the flue gas to collect and remove them. An ESP is comprised of a series of parallel, vertical metallic plates (collecting electrodes) forming lanes through which the flue gas passes.

How do electrostatic scrubbers work?

An electrostatic precipitator (ESP) removes particles from a gas stream by using electrical energy to charge particles either positively or negatively. The charged particles are then attracted to collector plates carrying the opposite charge.

How much does an electrostatic precipitator cost?

These precipitators are made using high-alloy stainless steels and typically cost $90 to $120/ft2.

Are electrostatic precipitators safe?

Although electrostatic precipitators can be effective for industrial flue gas, they can be harmful for home use because of the potential ozone production.

How much voltage does an electrostatic precipitator need?

The power supplies for the ESP con- vert the industrial AC voltage (220- 480 V) to pulsating DC voltage in the range of 20,000-100,000 V as needed.

What are Cottrell precipitator give their applications?

An electrostatic device whereby negatively charged dust or fume particles are attracted to a positively charged wire electrode enclosed in a flue, the walls of which act as the other electrode. Widely used for treating sulfuric acid mist, cement mill dust, power-plant fly ash, metallurgical fumes, etc.

At what voltage would an electrostatic precipitator operate at?

Voltages can be greater than 10,000 volts. Dust particles with high resistance are held too strongly to the plate, making them difficult to remove and causing trapping problems. In low resistance dust layers, the corona current is readily passed to the grounded collection electrode.

Where is electrostatic precipitator installed?

ESPs are installed at many types of industrial plant, but they are most easily identified at thermal power plants where they are installed as part of the flue gas cleaning system.

How does a scrubber operate?

Scrubbers are air pollution control devices that use liquid to remove particulate matter or gases from an industrial exhaust or flue gas stream. This atomized liquid (typically water) entrains particles and pollutant gases in order to effectively wash them out of the gas flow.

What are the disadvantages of electrostatic precipitators?

Electrostatic precipitators have a high initial capital cost, which makes it prohibitive for small-scale industries. They are expensive to purchase and install. In addition to being costly, they require large space to be set up.

Do electrostatic air filters create ozone?

As they create electric fields, the biggest problem with electrostatic precipitators is that they can create ozone as a byproduct. Ozone is a chemical that at ground-level is potentially harmful to health, and may aggravate asthma and damage the lungs.

What are the disadvantages of electrostatic precipitator?

Electrostatic Precipitators Information

Advantages Disadvantages
Handles very large gas volumes and heavy dust loads with low pressure drop. Not very flexible to changes in operating conditions once installed/purchased.
Very high collection efficiencies, even for very small particles. Cannot control gaseous emissions

How does ESP work in power plant?

What is Cottrell?

Definition of Cottrell process : electrostatic precipitation in which both the charging and precipitation are carried out in a single piece of equipment.

How does the Cottrell scrubber work?

Artwork: In Cottrell’s original 1907 design, dirty smoke enters the scrubber through the yellow pipe at the bottom. It flows past a wire cage (darker blue) charged to a high voltage by the transformer and switching unit at the top (lighter blue).

How does a smoke precipitator work?

Types of smoke precipitators. Electrostatic smoke precipitators all work in essentially this way, with dirt particles gaining an electric charge from one wire or plate before being attracted to a second wire or plate with the opposite electric charge for collection and disposal. Even so, there are many variations,…

Where is the precipitator?

The precipitator is located in the smokestack on the left closest to the camera. Photo by Warren Gretz courtesy of US DOE National Renewable Energy Laboratory (NREL). Have you tried that trick where you rub a balloon repeatedly on your sweater until it sticks by the sheer force of static electricity?

Where is the precipitator located at the McNeil biomass power plant?

Photo: Electrostatic smoke precipitation (ESP) equipment scrubs the waste gases at the McNeil biomass power plant in Burlington, VT. The precipitator is located in the smokestack on the left closest to the camera.