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Sample text
Magneticimpulse rappers usually operate more frequently, but with less intensity, than rotating hammer and anvil rappers. Rapper rods Figure 2-12. Typical magnetic-impulse rappers for collection plates Tumbling Hammers for Rigid Frame Discharge Electrodes Rigid frame discharge electrodes are rapped by tumbling hammers. The tumbling hammers operate similarly to the hammers used to remove dust from collection electrodes. The hammers are arranged on a horizontal shaft. As the shaft rotates, the hammers hit an impact beam which transfers the shock, or vibration, to the center tubes on the discharge system, causing the dust to fall (Figure 2-13).
How readily the charged particles move to the collection electrode is denoted by the symbol, w, called the particle-migration velocity, or drift velocity. The migration-velocity parameter represents the collectability of the particle within the confines of a specific ESP. The migration velocity is expressed in Equation 3-1. 14 As shown in Equation 3-1, migration velocity depends on the voltage strength of both the charging and collection fields. Therefore, the precipitator must be designed using the maximum electric field voltage for maximum collection efficiency.
Variables affecting particle velocity are particle size, the strength of the electric field, and the viscosity of the gas. How readily the charged particles move to the collection electrode is denoted by the symbol, w, called the particle-migration velocity, or drift velocity. The migration-velocity parameter represents the collectability of the particle within the confines of a specific ESP. The migration velocity is expressed in Equation 3-1. 14 As shown in Equation 3-1, migration velocity depends on the voltage strength of both the charging and collection fields.