Pipeline Contactor Design and Retrofit Fundamentals

Utilities with existing air system and aging ozone generating equipment are considering replacing generators capable of producing 1 to 2% ozone in air with those capable of producing ozone at 12% in oxygen. However, higher ozone weight percentage results in lower gas flow, issues with gas flow control, poorer mixing in the transfer cell of a conventional contactor, and oversized ozone destruct blowers, thereby requiring redesign of several subsystems within the ozone process. This document describes three retrofit experiences with installing (1) high concentration ozone generating equipment on a system formerly designed for air, (2) a sidestream injection system in an existing pipeline, and (3) a new pipeline contactor.