Waukegan, Illinois

AQEC Dry Sorbent Injection – Units 7 and 8

Client / Owner

NRG Energy

Architect / Engineer

Sargent & Lundy, LLC




Graycor Industrial

Project Scope

Under a joint venture partnership between Sargent & Lundy and Graycor Industrial, the GSL team engineered and installed Air Quality Environmental Control (AQEC) Dry Sorbent Injection (DSI) systems for S02 reduction and control for NRG’s units 6 (Powerton) and units 7 and 8 (Waukegan). The projects included BOP engineering, installation of the DSI system, foundations, piping, conduit and cabling, air and water systems, equipment skids incorporating blowers, mills, chillers and dehumidifiers, DCS interface controls, equipment building and associated HVAC, trona storage silos, and road upgrades.

Balance-of-plant (BOP) engineering was designed by Sargent & Lundy, with construction executed by Graycor.

Scope of Work:

BOP design engineering

DSI system installation

ESP modifications (SMPS installation) – Powerton project only

Pre-operational testing

Material and BOP equipment procurement


Trona silo assembly and setting (3 total)

Complete underground electrical and piping

Installation of cable trays for ESP modifications – Powerton project only