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renilaneev
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Join Date: May 2014
Posts: 3

Back Corona

05/13/2014 6:51 AM

I have an ESP for pelletizing plant . The ESP is for down draft zone. During normal operation we have stable mA and kV with emission of < 15 mg/nm3. But when the plant trips, ( traveling grate stops), there is fluctuation observed in mA and KV. Back corona is detected by the controller. We also face dust puffing from stack. There are mA and primary current shooting up ( spikes) observed

We have pipe and spike type electrode and we have tumbling hammers type of rapping. There is no high dust deposition observed on collecting electrodes.

How to avoid back corona and what controller setting will help in reducing this mA drops.
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Pathfinder Tags: ELECTROSTATIC PRECIPITATOR
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Fredski
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Join Date: Feb 2011
Posts: 7025
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#1

Re: Back Corona

05/13/2014 8:19 AM

can ya have too much Corona?
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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
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#2

Re: Back Corona

05/13/2014 10:41 AM

There are a lot of variables involved here that you don't give the parameters of testing that has been done, so you leave very little to work with....You might try a proper cleaning to begin with....You never said that it is working properly during normal operation....The condition that causes back corona(sparking) is too much resistivity for the precipitator field....You might try a pulsed or intermittent voltage supply controller...Did it ever work properly? What has changed? temp, humidity, material, maintenance procedure?

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renilaneev
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Join Date: May 2014
Posts: 3
#3
In reply to #2

Re: Back Corona

05/13/2014 12:34 PM

Esp works normally with max mA of 1200 during normal operation.Rapping system is healthy.There is no abnormal dust deposit on ce plates.checked during last shutdown. The controller U mentioned does it work by blocking firing cycle like charge ratio mode?
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SolarEagle
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#4
In reply to #3

Re: Back Corona

05/13/2014 2:28 PM

Yes I believe it used micro processor controlled thyristor.....

http://www.asplparts.com/micro.html

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SolarEagle
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#5
In reply to #4

Re: Back Corona

05/13/2014 6:57 PM

ADMIN: Removed Resource

The linked article was removed because it is no longer on the host site.

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renilaneev
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#6
In reply to #5

Re: Back Corona

05/14/2014 3:42 AM

Thanks for the clarification...
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