Catalyst Pluggage Reduction for Roxboro U3

Presented at the EPRI SCR Workshop
Raleigh, NC - November, 2009

Author:
Robert G. Mudry, P.E., Airflow Sciences Corporation
Matt Boone, Progress Energy
Abstract:

Progress Energy's Roxboro Plant in Semora, NC has been experiencing ash pluggage of the catalyst on Unit 3. The pluggage has caused increased pressure drop and reduced performance of the SCR and boiler. Field testing and flow modeling by Airflow Sciences Corporation indicated that both large particle ash (LPA) and fine flyash were causing the pluggage. A high-temperature video camera showed that the existing LPA screen was highly plugged during unit operation, and velocity measurements indicated imbalances in the SCR. Using the model, various design modifications were evaluated and optimized. After installation of the modifications in fall 2009, SCR performance has been tracking well, and system pressure loss has remained at baseline levels.

Click here to view or download a copy of the presentation in PDF format (4.36 MB).