As a part of environmental upgrades at the Arizona Public Service Cholla Plant, APS installed a wet-scrubber system which necessitated retro-fitting the Unit #1 chimney to accommodate the operational changes. The structure, a 250’ tall reinforced concrete chimney equipped with a corbel brick lining, was modified and an Incoloy 27-7 Mo liner was installed. The scope of work for the project included:
Interior abatement of corbel joints
Demolition of selective areas of the brick lining
Installation of a new 250’ × 11’-3” Ø Incoloy 27-7 Mo Liner
Installation of a liquid-collection system and drain piping
Cutting openings in the concrete shell for new sample ports & CEMS equipment
Replacement of FAA obstruction lighting
The removal of a micro-wave antenna system
Lead-coating abatement and re-coating of the concrete shell
