Daniel K Hebert

US Patent:

51221624, Jun 16, 1992

Filed:

Mar 19, 1990

Appl. No.:

7/496873

Inventors:

Henry V. Krigmont - Seal Beach CA
Everett L. Coe - Downey CA
Daniel A. Hebert - Irvine CA
Wayne R. Kozacka - Laguna Hills CA

Assignee:

Wahlco, Inc. - Santa Ana CA

International Classification:

B03C 366

US Classification:

55 5

Abstract:

The volumetric flow rate for the addition of a flue gas conditioning agent, such as sulfur trioxide, is established by maintaining the derivative of the electrostatic precipitator power with respect to flow rate within a preselected operating range. The derivative of the precipitator power with respect to time and the derivative of the flow rate with respect to time are measured, and then the derivatives are divided to determine the derivative of precipitator power with respect to flow rate. This calculated value is compared with a preselected operating range. If the calculated value is greater than the preselected operating range, the flow rate of the conditioning agent is increased. If the calculated value is less than the preselected operating range, the flow rate is reduced, until a steady state calculated derivative value within the operating range is reached.