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Precipitator rappers
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To dislodge the collected material from the precipitator collecting and discharge electrodes,
Hamon Research-Cottrell utilizes magnetic impulse gravity impact MIGI® rappers. The
MIGI® rapper is a simple electromagnetic device that has only one moving part, a 20 pound plunger.
Rapper operation is initiated by a controlled, short duration, low voltage (110 V d.c.) pulse. This pulse
energizes the solenoid coil, generating a magnetic field that lifts the plunger into the phenolic guide tube.
After the coil is de-energized, the plunger drops by gravity and impacts on a stationary rapper rod that transmits
the forces to the internal components.
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Unlike the tumbling hammer design, the MIGI® rapper has no moving parts in the gas stream
and is not exposed to the erosive effects of the flue gas and particulate. Roof mounting permits on-line
inspection and servicing. Also, as conditions change, the intensity of the rapping force can be easily
changed from the rapper control panel. With the tumbling hammer design, the rapping force cannot be changed
unless the precipitator is de-energized and the hammer weights replaced.
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 Click here to learn more about our rapper design.
Quick links to:
Collecting electrodes
Discharge electrodes
Rappers
Particulate disposal
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