Smelt Bed Cameras

The Challenge of Recovery Boiler Monitoring

Operating a chemical recovery boiler in a pulp mill is one of the most volatile and dangerous processes in heavy industry. Operators must maintain a delicate balance of black liquor combustion, char bed height, and continuous smelt flow. If the char bed builds up too high, it chokes the boiler; if a water tube leaks and contacts the smelt bed, it can cause a catastrophic explosion. Standard cameras are immediately blinded by the dense chemical smoke, falling ash, and extreme heat, leaving control room operators completely blind to rapidly deteriorating combustion conditions.

Wavelength-Optimized Smelt Bed Imaging

Syn-Fab smelt bed camera systems—including the industry-standard Terminator series—utilize advanced, wavelength-optimized infrared optics specifically designed to cut through dense recovery boiler smoke and chemical haze. Housed in rugged PIII STEELON™ enclosures with continuous air-purge protection, our systems provide a crystal-clear, real-time view of the char bed, smelt spouts, and burner zones, ensuring continuous operation in ambient temperatures up to 550°F (289°C).

Operational Benefits:

• Monitor Char Bed Health: Visually confirm char bed height, shape, and stability to optimize the black liquor firing rate and prevent boiler choking.
• Ensure Smelt Spout Flow: Continuously monitor the smelt spouts for blockages or heavy runoff, preventing dangerous buildup and shattered shatter jets.
• Prevent Water-Smelt Explosions: Detect tube leaks instantly, allowing operators to initiate emergency shutdown procedures before water contacts the active smelt bed.
• Eliminate Port Rodding Risks: Drastically reduce the need for personnel to conduct hazardous manual visual inspections at the boiler observation ports.