Success using Bag Leak Detection Systems (BLDS) in an ESP

Posted by Justin Dechene on Apr 18, 2015 10:00:00 AM

Have you always thought that triboloectric electrostatic bag leak detection systems (BLDS) were unable to monitor in ESP’s?

The signal is ‘unreliable, unstable, doesn’t work, unacceptable? Right?...Wrong!

We are pleased to note that advances to triboelectric electrostatic technology where both portions (Unified DC and AC: 100% of signal) of the signal are working in unison allow for successful monitoring in difficult conditions such as an ESP, where older, traditional Bag Leak Detectors and BLDS have consistently failed.

Monitoring particulate matter emissions from an Electrostatic Precipitator (ESP) has been a challenge for Electrostatic Sensing based instruments since the introduction of the technology to market back in the early 80s. New all-digital, Auburn TRIBO.dsp technology unifies DC impaction (triboelectric) and AC (induction) electrostatic signals for superior accuracy, reliability, and repeatability. Unlike other variations of AC only induction monitors TRIBO.dsp monitors provide the highest sensitivity and the widest dynamic range required to operate reliably within ESP dust collectors.

Auburn Triboelectric Unified Bag Leak Detection System Technology

When considering dust monitoring in ESPs, two factors must be considered: first, an ESP generates a strong electrical field, which can interfere with older standard triboelectric dust monitoring circuitry; second, particles passing through the ESP field absorb a large amount of electrical charge, which will saturate a dust monitor circuit with limited dynamic range (for fabric filter dust collectors the particle detection-signal range is usually in a normal operating range of ~200-3000 picoamps (pA); for ESPs, it can be ~10,000 – 1,000,000pA).

Detectors using Unified DC/AC  have recently succeeded in trials when installed in ESP’s providing a reliable output signal that effectively trends the operation of the ESP.  For instance, fluctuations in power to the ESP results in corresponding signal changes that show increases and decreases in the dust baseline. Rapping sequences can be tracked, similar to cleaning pulses in a fabric filter baghouse.  This gives the ESP user meaningful data that can be used to more efficiently operate the Electrostatic Precipitator.  

In essence, Tribo.dsp, Unified DC/AC, all-digital circuitry combined with proprietary digital signal processing (DSP) algorithms, creates a robust and stable monitoring technology which has proved resistant to interference to the high energy, electrostatic precipitator field, and has sufficient measurement range to avoid system saturation in the presence of the strongly charged, dust particles continuously being generated.

If your facility is operating an Electrostatic Precipitator you might consider utilizing this new monitoring technology to improve your operational control, and actually monitor  the emissions output.

For other tips specific to how to best choose what BLDS system will work best for you, download our 15 Tips for selecting the Best Bag Leak Detection System:

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Topics: Particulate Monitoring, Dust Collection