Design Innovation Enhances Stability of FCC Furnace Draft Pressures by Mitigating Wind Effects.
A major refinery in Ohio requested The Nexus team to replace an existing fluid catalytic cracking (FCC) furnace since the existing furnace is nearing the end of its service life. A new furnace will also meet requirements for reducing nitrogen oxide emissions.
During the design phase of the FCC Furnace, the team encountered discussions regarding the impact of wind on draft pressure readings. The draft pressure instruments, tied into the Safety Instrumented System (SIS), played a critical role in furnace operation and trip prevention. These instruments measured pressure within a narrow range of 1 to 2 inches of WC, with atmospheric conditions serving as the reference. However, wind disturbances often caused fluctuations in the readings, affecting both furnace efficiency and trip control.
To mitigate the impact of wind on draft pressure readings in the FCC Furnace, the Nexus team implemented innovative measures. By modifying the location and orientation of draft pressure transmitters and incorporating shielding mechanisms, they successfully reduced fluctuations caused by wind. The newly installed FCC Furnace draft transmitters demonstrated significantly improved resistance to wind effects, resulting in more stable pressure readings and enhanced furnace performance.