Another rapping
system used for many U.S. designs consists of magnetic-impulse rappers to
remove accumulated dust layers from collection plates. A magnetic-impulse rapper
has a steel plunger that is raised by a current pulse in a coil. The raised
plunger then drops back, due to gravity, striking a rod connected to a number
of plates within the precipitator as shown in Figure. Rapper frequency and
intensity are easily regulated by an electrical control system. The frequency
could be one rap every five minutes or one rap an hour with an intensity of 10
to 24 g's (Katz 1979). Magnetic impulse rappers usually operate more
frequently, but with less intensity, than rotating hammer and anvil rappers.
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