What is meant by electrostatic precipitator?
electrostatic precipitator, also called electrostatic air cleaner, a device that uses an electric charge to remove certain impurities—either solid particles or liquid droplets—from air or other gases in smokestacks and other flues.
What is electron precipitator used for?
An electrostatic precipitator (ESP) is defined as a filtration device that is used to remove fine particles like smoke and fine dust from the flowing gas. It is the commonly used device for air pollution control. They are used in industries like steel plants, thermal energy plants.
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.
What is Cottrell electrostatic precipitator?
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.
What is the efficiency of electrostatic precipitator?
Design efficiencies are usually better than 99.5%. Overall collection efficiencies of 99.7%–99.9% and fine particulate collection efficiencies >99% are common. An FF consists of a large surface area of fabric, which collects dust particles from the flue gas passing through it.
Does an electrostatic precipitator remove co2?
Electrostatic precipitators or (ESP) will take the soot, ashes, and unburned carbon dioxide from smoke through an electric charge and emit clean air or smoke into the atmosphere. Extraction of these harmful products is very important as pollutants can cause serious damage to buildings, environment, and human health.
How does a precipitator 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.
What are limitations of ESP?
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 |
What is the principle of smoke precipitator?
Cottrell smoke precipitator works on the principle of neutralization. It neutralizes the charge on the carbon particles.
What is Cottrell?
: electrostatic precipitation in which both the charging and precipitation are carried out in a single piece of equipment.
What is back corona in ESP?
Back corona is caused by the electrical breakdown of gas in the dust layer. This breakdown produces positive ions, which drift toward the negative discharge electrode. The presence of ions with opposite polarity causes a reduction in the particle-charge and particle-collection efficiency.
How do you calculate ESP efficiency?
especially when the gas to be treated and its particles are hot or wet. Typical efficiency of an electrostatic precipitator as a function of the corona power ratio, which is power consumed (in Watts) divided by the airflow in cubic feet per minute (cfm).
What are the components of Electrostatic precipitator?
The main components of an ESP consist of collecting electrodes/plates, discharge electrodes, inlet and outlet perforated screens, insulators for the discharge electrodes, rappers, and one or more electrical transformers.
How do electrostatic precipitator reduce air pollution?
Particle removal—electrostatic precipitator
The electrostatic precipitator works by removing particles and smoke from a gas stream using an electrostatic charge. Dust particles travel past wires that have a high direct current (DC) voltage applied, which ionises the surrounding gas.
What is the capacity of ESP?
Electrostatic Precipitator, Capacity: 10 To 600 MW
| Type of electrostatic precipitator | Dry ESP |
|---|---|
| Orientation | Horizontal |
| Usage/Application | Power Plants,Boilers and Heaters |
| Capacity | 10 to 600 MW |
| Gas Temperature | 70 – 400 Degree Celsius |
What is the supply voltage range of ESP Plate?
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.
How do you make a smoke precipitator?
Electrostatic Precipitator/Smoke Precipitator – How it Works/How to …
How many types of electrostatic precipitators are there?
There are four basic types of ESPs: plate and wire (dry), flat plate (dry), wet, and two-stage. ESPs provide a large air volume, operate favourably in various temperatures, and require little maintenance.
Why is Cottrell smoke precipitator?
Smoke is a colloidal solution of carbon, arsenic compounds, dust etc in air, These carbon particles are precipitated in direct contact with oppositely charged metallic plates for separation in smoke and the gases which evolved from the chimney are smokeless. This precipitation is called Cottrell smoke precipitator.
Where is the name Cottrell from?
western England
English (southern and western England): status name for a cottager from Old French coterel a diminutive of cotier ‘cottager’ (see Cotter ).
What is corona and skin effect?
CORONA EFFECT. 2. SKIN EFFECT • The non-uniform distribution of electric current over the surface or skin of the conductor carrying a.c. is called the skin effect. • The concentration of charge is more near the surface as compared to the core of the conductor.
What is ESP efficiency?
The collection efficiency of the ESP is related to only corona power irregardless of the gas temperature. To increase the resistivity of the oil dust, the technology is used that the ammonia is injected into the ESP inlet gas, and ammonium sulfate with a high-resistivity matter is produced.
Who invented electrostatic precipitator?
Frederick Gardner Cottrell
Frederick Gardner Cottrell, (born Jan. 10, 1877, Oakland, Calif., U.S.—died Nov. 16, 1948, Berkeley, Calif.), U.S. educator, scientist, and inventor of the electrostatic precipitator, a device that removes suspended particles from streams of gases.
What are the parts of ESP?
An ESP is primarily made up of the following four components: gas distribution plates, discharge electrodes, collection surfaces (either plates or pipes) and rappers. The gas distribution plates consist of several perforated plates which help maintain proper flow distribution of the entering gas stream.