IECM 12.0 beta User Manual > Modules Included with the IECM > Pulverized Coal (PC) Plant > SET PARAMETERS > TSP Control > Cold-Side ESP >

Performance

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Inputs for the performance of the Cold-Side ESP are entered on the Performance parameter screen.

ESPs consist of a series of parallel plates with rows of electrodes in between them and carry a high voltage of opposite polarity. As the particle laden flue gas enters the unit, the particles are charged by the electrodes and is attracted to the plates. At controlled intervals the plates are rapped which shakes the dust to a hopper below. However, some of the dust is re-entrained and carried to the next zone or out of the stack. Most ESPs use rigid collecting plates with shielded air pockets (baffles) through which ash falls into the hoppers after rapping.

The major design parameters which can significantly impact the total system capital cost are gas flow volume (which depends on the generating unit size), SCA, the collecting plate area per transformer-rectifier (T-R) set and the spacing between collector plates.

Many of the parameters are calculated by the IECM. The following parameters are available:

•Particulate Removal Efficiency: The calculated value determines the removal efficiency needed to comply with the specified particulate emission limit set earlier. This efficiency then determines the mass of particulate matter removed in the collector.

•Actual SO3 Removal Efficiency: The default value is taken from the removal efficiency reported in the literature (references are below). This efficiency then determines the mass of SO3 removed from the flue gas in the collector. For more information see also:

•Hardman, R; Stacy, R; Dismukes, E "Estimating Sulfuric Acid Aerosol Emissions from Coal-Fired Power Plants", US DoE-FETC Conference on Formation, Distribution, Impact and Fate of Sulfur Trioxide in Utility Flue Gas Streams 1998 (currently available at https://web.archive.org/web/20040307161115/http://www.netl.doe.gov/publications/proceedings/98/98fg/hardman.pdf )

•Rubin, E. S. "The Importance of Sulfur Trioxide for the Toxic Release Inventory", US DoE-FETC Conference on Formation, Distribution, Impact and Fate of Sulfur Trioxide in Utility Flue Gas Streams 1998 (currently available at https://web.archive.org/web/20030416143712/http://www.netl.doe.gov:80/publications/proceedings/98/98fg/rubin.pdf)

•Collector Plate Spacing: The collector plate spacing is typically 12 inches. The spacing is used to determine the specific collection area.

•Specific Collection Area: The specific collection area (SCA) is the ratio of the total plate area and flue gas volume. It sizes the ESP. The value is calculated from the removal efficiency, plate spacing, and the drift velocity. It is used to determine the capital cost and the total collection area required.

•Plate Area per T-R Set: This is the total surface area of one T-R set of plates. It is used to determine the total number of T-R sets needed and the capital costs.

•Percent Water in ESP Discharge: This is the water content of the collected fly ash. Fly ash disposed with bottom ash is assumed to be sluiced with water and dry otherwise. The occluded water in wet fly ash is difficult to remove, resulting in a rather high water content when the fly ash is mixed with bottom ash.

•Cold-Side ESP Power Requirement: The default calculation is based on the T-R set power consumption with estimates for auxiliary power requirements and electro- mechanical efficiencies of fan motors. The T-R set power consumption is a function of removal efficiency.