�� Determine the required sorbent injection rates to meet compliance at low, medium, and high loads.

�� Compare the effectiveness of Sorb-Tec™ Lance-Less Technology against traditional lances.

�� Determine sorbent injection impact on downstream electrostatic precipitator (ESP) and fly ash handling systems.

�� Test the impact on mercury removal of adding hydrated lime to activated carbon.

Case Study Reducing DSI Operating Costs

�� The station has one 175 MWe coal-fired generating unit, using PRB coal. The client requested Nol-Tec Systems to provide a temporary DSI system for analysis of SO2 emissions performance

�� Activated carbon is injected prior to the air heater for mercury control. During the test period, hydrated lime was also injected prior to the air heater.

�� The north duct was fitted with six Sorb-Tec injectors. The south duct utilized six, four-foot long lances for injection.

�� An FTIR probe was installed at the discharge of each ESP outlet.

�� Sorbent was fed into the system via two 25 ft3 weigh hoppers for accurate measurement of the sorbent used (within an accuracy of 0.5% wt.)

Project Objectives

Set-Up

Sorb-Tec injectors installed instandard injection openings

Sorb-Tec control boxes

Nol-Tec Systems, Inc. t 425 Apollo Drive, Lino Lakes, MN 55014 t Ph: 651-780-8600Sales@nol-tec.com t www.nol-tec.com

Nol-Tec Systems, Inc. t 425 Apollo Drive, Lino Lakes, MN 55014 t Ph: 651-780-8600Sales@nol-tec.com t www.nol-tec.com

Observed Performance

Completely clean inside of Sorb-Tec injector after test

Unit LoadStandard

LancesSorb-TecInjectors

Savings withSorb-Tec Performance

MW Injection rate (lbs./hr.) required to obtain compliance

65 889 lb/hr 622 lb/hr 267 lb/hr 30.0%

130-140 2,760 lb/hr 1.932 lb/hr 828 lb/hr 31.9%

160-175 6,104 lb/hr 4,273 lb/hr 1,831 lb/hr 42.9%

Conclusions

�� Sorb-Tec is a viable solution for reducing the usage of dry sorbent injected for SO2 compliance standards.

�� Sorb-Tec delivered between 30-43% sorbent reduction against standard lances, ensuring optimum injection efficiency can be achieved at any load.

�� The additional air added through the Sorb-Tec injectors had no impact on plant conditions and ID fans throughout the trial.

�� No negative impacts were observed on the ash handling system, with expected reduction in sorbent in ash content (% reduction not analyzed during trial).

�� No pluggage of the injectors throughout the duration of the trial, minimizing all lance-related maintenance often occurring when injecting dry sorbents.