Boiler hood

Product Name: Large CFB Boiler Air Cap / Heavy-Duty Air Distributor Nozzle

Overview
Our large CFB boiler air caps are precision engineered for high-power Circulating Fluidized Bed (CFB) boilers requiring robust airflow distribution. With a single-piece weight of approximately 7 kilograms and enlarged air outlet ports, these components are designed for the demanding conditions of large-scale power generation. Manufactured from SS310 heat-resistant alloy, each air cap is produced using advanced casting techniques validated by finite element analysis (FEA) . With nearly 20 years of specialized experience in high-temperature alloy casting, we deliver air caps that offer exceptional durability, extended service life, and reliable performance under extreme thermal and erosive conditions.

Key Features

· Material: High-grade SS310 (UNS S31000) heat-resistant stainless steel — excellent creep strength, oxidation resistance up to 1000°C (1832°F), and superior thermal fatigue resistance
· Single-Component Weight: Approximately 7 kg per air cap — designed for high-power CFB boilers with larger air distribution requirements
· Enlarged Air Outlets: Optimized outlet geometry for increased airflow capacity while maintaining uniform fluidization and preventing bed material backflow
· Casting Challenges: SS310 high-temperature alloy exhibits lower fluidity compared to carbon steel — casting large, heavy components requires exceptional process control to ensure complete mold filling, directional solidification, and defect-free internal structure
· Process Validation – Finite Element Analysis (FEA): Advanced computer simulation used to:
– Optimize gating and riser system design for controlled solidification
– Predict shrinkage porosity and hot spot locations
– Ensure complete cavity filling despite SS310’s limited fluidity
– Minimize trial-and-error iterations, reducing development time and ensuring first-pass quality
· Dimensional Accuracy: Precision tooling and controlled casting parameters ensure consistent geometry for proper fitment on the air distributor plate
· Quality Assurance: 100% dimensional inspection, material certification, and optional non-destructive testing (radiography, dye penetrant) available

Technical Challenges & Our Solutions

Challenge Our Solution
SS310 high-temperature alloy has poor fluidity, making large castings prone to misrun and cold shut FEA simulation optimizes filling parameters and gating design to ensure complete mold filling
Large section thickness (7 kg) increases risk of shrinkage porosity and hot tears Controlled directional solidification through riser design and chilling strategy
Casting integrity directly impacts service life in aggressive CFB environment Rigorous process control and post-casting inspection ensure dense, defect-free structure
Consistent dimensional accuracy required for proper sealing and airflow uniformity Precision tooling and experienced casting operators maintain repeatability across production runs

Applications

· High-power Circulating Fluidized Bed (CFB) power plant boilers
· Large-scale industrial boilers and biomass power generation
· Coal-fired fluidized bed combustion systems requiring heavy-duty air distribution components

Why Choose Our Large CFB Air Caps?

· Specialized Expertise in High-Temperature Alloys: Nearly 20 years of focused experience casting SS310 and other heat-resistant alloys — we understand the unique challenges of heavy-section, high-temperature components
· Computer-Validated Process Design: Finite element analysis (FEA) is integrated into our manufacturing workflow, ensuring robust casting designs before production begins — reducing risk and ensuring consistent quality
· Superior Service Life: Our optimized casting processes deliver dense, homogeneous microstructures with minimal porosity, directly translating to longer service life compared to conventional castings — reducing boiler downtime and replacement frequency
· Large Component Capability: Specialized foundry capabilities enable us to produce heavy single-piece castings up to and beyond 7 kg, with dedicated handling and quality control for large-format components
· Proven Track Record: Decades of successful supply to CFB power plants worldwide, with dozens of custom designs developed for various boiler models and operating conditions

· Full Traceability & Certification: Material composition verification, mechanical property testing, and complete documentation for quality assurance.

Get a Quote

For large CFB boiler air caps requiring SS310 heat-resistant alloy and validated casting processes, our nearly 20 years of specialized experience delivers reliability and extended service life. Contact us with your specifications for a prompt quotation.