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anandchy
Active Contributor

Join Date: Dec 2010
Posts: 15

Electro Static Precipitaor (ESP)

10/17/2012 9:41 PM

I understand that in Electro Static Precipitaor (ESP) negative high DC(Direct Current) voltage is given to emitting rod for corona discharge and collecting plate is charged +ve.Also collecting +ve plated is grounded.By corona discharge from emitting rod gas particles get ionised, and attracted towards +ve collecting plate.

Three doubts i need to clear is-

1.Why +ve collecting plate is grounded?

2.Is corona a phenomenon dependent on -ve DC voltage only? Means why emitting rod is charged high -ve.

3. How ionisation of flue gas produce a negative charged dust particle? Which later get accumulated on +ve collecting plate?
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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: Electro Static Precipitaor (ESP)

10/17/2012 11:32 PM

How an Electrostatic Precipitator Works

What Is an Electrostatic Precipitator?

What Is an Electrostatic Force?
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satendrakumart
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Join Date: May 2011
Posts: 61
Good Answers: 1
#2

Re: Electro Static Precipitaor (ESP)

10/19/2012 12:28 AM

When two conductors, with high voltage between them, are kept at a distance to just start the corona effect, elections get discharged always from negative conductor and collected by positive conductor.

When these electrons come in contact with dust particles in the way to collecting electrodes, they get stuck with dust particle and make them negatively charged.

Now these dust particles which are negatively charged, after combining with electrons, are collected by positive collecting plates.

Area and weight of collecting plates are kept large in order to collect the dust properly and it is always convenient to mount them structure frame which is grounded.

Collecting electrode are heavy and discharge electrons are light in weight so the lighter one is hanged with insulators and heavier one is mounted with metal structure of ESP.
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7anoter4
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Join Date: Oct 2012
Location: 100 miles North from the World Center
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Good Answers: 42
#3

Re: Electro Static Precipitaor (ESP)

10/19/2012 12:39 AM

I think you could get an answer for all these questions in the following article:

http://web.njit.edu/~avs9/Procedure%20Draft%20Final.htm

The collecting plates are grounded since they are connected further to rappers and hoppers accessible to be touch by operating people.

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satendrakumart
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Join Date: May 2011
Posts: 61
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#4

Re: Electro Static Precipitaor (ESP)

10/19/2012 12:47 AM

"The collecting plates are grounded since they are connected further to rappers and hoppers accessible to be touch by operating people."

Dear 7anoter4

Discharge electrodes are also connected with rappers & Collecting electrodes are not connected with hoppers.
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7anoter4
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Location: 100 miles North from the World Center
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#5

Re: Electro Static Precipitaor (ESP)

10/19/2012 3:16 AM

In my humble opinion the discharge electrodes are insulated from the rest of the precipitator being under high voltage, but the collecting plates are not, so they are connected electrically with the steel construction.

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Viral Mistry
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Join Date: Mar 2017
Posts: 1
#6
In reply to #5

Re: Electro Static Precipitaor (ESP)

03/23/2017 12:29 AM

What happened if we ground emitting electrode?
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