Planning and design of effective wet duct/stack systems for coal fired utility power plants

CICIND Philadelphia / April 2008 – David Anderson, Alden Research Laboratory


Trouble-free operation of a FGD unit with wet ducts and stacks requires investigation of several potential problem areas related to the handling and discharge of wet flue gas during the design of the stack and duct system.

One of the key steps in the development of an effective wet stack installation is the proper fluid dynamic design of the wet duct/stack system. The design process, usually performed by a flow modeling laboratory with experience in this area, typically consists of five distinct phases:
Phase 1 – Initial Review of Proposed System Designs
Phase 2 – Condensation Calculations
Phase 3 – Liquid Collection System Design and Development
Phase 4 – Plume Downwash Study
Phase 5 – Field Installation and Operational Inspections

Using the results of the first four phases the unit design can be finalized and the specifications for the bids for construction can be written. The fifth phase supports the installation of the recommended liquid collection system.

Read more about the important design aspects which must be addressed to minimize liquid discharge from both new and retrofit wet stack installations in the complete paper.