Experiments were performed to determine the changes in the electrostatic charges of various fine particles after addition to gas-solid fluidized beds to better understand their role in influencing electrostatic charge generation/dissipation. Electrostatic charge measurements were performed by an on-line Faraday cup employing the fluidization column as the inner Faraday cup, located symmetrically inside a second copper column forming the outer cup. Preliminary results show that the entrained fines leaving the top of the fluidization column carry charges, resulting in a net charge inside the bed. The charges carried by different fines (Larostat 519 antistatic agent, glass beads and silver-coated glass bead particles) were determined for a range of operating conditions and relative humidities.
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