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Reagent Preparation and Dewatering in a Wet FGD System

If limestone consumption must be increased to improve SO2 removal, the reagent preparation and dewatering systems may be undersized. In most cases, higher SO2 removal requires a finer grind than what older systems were originally designed to achieve.

Limestone Forced Oxidation System Upgrades

A wet FGD can be converted to forced oxidation using the existing reaction tank, or in some cases, an external oxidation tank can be used. This conversion will minimize scaling from utilization of stable system chemistry and creating a saleable byproduct which will decrease disposal costs.

Mist Eliminators and Mist Eliminator Wash System

Older generation ME wash system designs tended to not effectively wash all surfaces of the MEs when compared to current designs. Fixed grid ME wash headers can be retrofitted in place of retractable lance-style wash systems or fixed grids that were ineffective in washing the ME surfaces.

Upgrades to Wet FGD Absorber Spray Headers

Spray header support systems are another area for potential upgrades. Older generation spray header designs used a support system that was prone to breakage which causes the header sections to fail and fall to the bottom of the absorber.

Upgrades to Existing Wet FGD Systems to Improve Performance, Reduce Operating and Maintenance Costs and Improve Reliability

Upgrading an existing wet FGD system may be an effective way to improve SO2 removal, allow the use of lower cost higher sulfur coals, reduce power consumption, allow for the use of an alternate, lower-cost reagent, and improve the reliability of the system while reducing the operating and maintenance costs.

Absorber Gas-Liquid Contact Devices

Wall rings improve SO2 collection efficiency by reducing the gas bypass in an open spray tower which results from the tendency of the flue gas to hug the walls of the absorber. Wall rings also push out the slurry that runs down from the walls back into the gas stream, improving the contact between the slurry and flue gas.

Nitrogen Oxides (NOx) Primer

SNCR typically is limited to lower NOx reduction levels but may be the more economical choice depending on the required NOx reduction or the unique project requirements. Both technologies have been successfully applied for NOx reduction on multiple fuels and boiler types.

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