Careers Circulating Fluidized Bed (CFB) Boilers
CFB Boiler Tube Life Extension for Coal, Biomass and WtE Boilers
CFB boiler tube erosion and fireside corrosion are among the leading causes of pressure-part failures, unplanned outages and increased maintenance costs in circulating fluidized bed boilers.
With experience spanning more than 600 CFB boiler applications worldwide, IGS has developed a systematic approach to maximizing runtime while minimizing outage frequency and maintenance costs. By combining detailed boiler assessments, advanced wear modeling, and engineered tube protection solutions, operators can proactively manage metal wastage rather than reacting to failures after they occur. This approach helps plants extend operating cycles, eliminate pressure-part replacements, and improve long-term CFB boiler performance.
CFB Boiler Reliability: A Proactive Approach
Achieving long-term CFB boiler reliability requires a comprehensive evaluation of the boiler. Every boiler has unique operating conditions, fuel characteristics and erosion patterns that influence the rate of pressure-part degradation.
IGS evaluates factors including:
- operating history
- fuel characteristics
- ultrasonic thickness data
- previous tube failures
- existing wear patterns
- erosion and corrosion mechanisms
By understanding the specific challenges facing each unit, protection is optimized for the areas that need them most, delivering predictable performance and measurable results throughout the life of the boiler.
This proactive philosophy enables plant owners to move beyond emergency repairs and toward a reliability-centered maintenance strategy:
- protect critical pressure parts
- reduce tube erosion and fireside corrosion
- reduce outage risk
- support longer, more profitable operating runs
- improve long-term boiler performance
I’m here to help
Colin Bateman
IGS Subject Matter Expert
Proven Results in the Field
Plant operators consistently report reduced maintenance scope and improved outage planning after implementing HVTS.
By understanding wear rates and proactively managing protection systems, facilities can:
- Extend operating cycles between outages
- Eliminate tube leak risk
- Prevent emergency repairs
- Improve outage predictability and maintenance planning
- Lower total maintenance and lifecycle costs
- Increase overall plant availability and profitability
The goal is simple: achieve reliable operation without unexpected tube failures
CFB Boiler Tube Erosion and Corrosion
Reliability in a Circulating Fluidized Bed (CFB) boiler is determined by one critical factor: how effectively operators manage tube wear caused by fly ash erosion and fireside corrosion.
These damage mechanisms are among the leading causes of:
- unplanned outages
- costly repairs
- reduced operating efficiency
Many plants still rely on generic protection strategies that fail to address the unique wear patterns within each boiler.
The result is long-term protection against fly ash erosion and fireside corrosion, helping operators extend run lengths and reduce maintenance requirements.
| Category | IGS HVTS® | Typical Thermal Spray Vendors |
|---|---|---|
| Total Cost of Ownership | Reduces outages, tube leaks, and maintenance costs | Higher risk of repeat repairs and downtime |
| Technology | Proprietary materials and HVTS process backed by 30+ years of R&D | Standard thermal spray equipment and materials |
| Analysis & Expertise | CFB-specific wear analysis and customized protection plans | Limited technical evaluation capabilities |
| Proven Results | 600+ CFB boiler applications focused on leak-free operation | Improper application can increase wear and tube leak risk |
| Field Execution | Experienced outage teams with proven safety and schedule performance | Greater risk of delays, coordination issues, and safety incidents |
Before HVTS
After HVTS
Common Tube Degradation Mechanisms in CFB Boilers
Tube degradation in circulating fluidized bed (CFB) boilers rarely results from a single damage mechanism. The type, severity and location of wear depend on the fuel being fired, ash chemistry, operating temperatures and boiler design.
Common degradation mechanisms include:
- Fly ash and bed material erosion
- Fireside corrosion
- Erosion-corrosion
- High-temperature oxidation
- Hot molten salt corrosion in biomass and waste-to-energy (WtE) boilers
- Dew-point corrosion affecting cooler heat transfer surfaces
- Localized metal wastage in high-wear areas
Different fuels create different corrosion environments. Coal-fired units are often dominated by erosive wear, while biomass and WtEboilers may also experience aggressive corrosion caused by alkali salts, chlorides and other fuel contaminants.
Understanding the dominant degradation mechanism is essential when selecting the appropriate tube protection strategy. Solutions designed for erosion alone may not provide adequate protection where high-temperature corrosion or molten salt attack is the primary driver of metal loss.
Watch: CFB Boiler Reliability | Stop Boiler Tube Leaks and Erosion
Why HVTS Technology Matters
The performance of any thermal spray solution depends heavily on the application process.
IGS utilizes true High Velocity Thermal Spray (HVTS), where material particles are atomized in a supersonic gas stream. This process produces a denser, stronger, and more durable protective layer than conventional low-velocity thermal spray methods.
A Global Partner for CFB Boiler Reliability
IGS technicians and project teams support CFB operators around the world, providing specialized expertise during planned outages, turnarounds, and long-term reliability programs.
From initial assessment through application, inspection, monitoring, and refurbishment, IGS delivers a complete reliability solution tailored to the operating conditions of coal-fired, biomass and waste-to-energy (WTE) circulating fluidized bed boilers.
By combining engineering expertise with High Velocity Thermal Spray (HVTS®) technology, IGS helps operators reduce tube failures, improve outage planning, extend pressure-part life and maximize long-term CFB boiler reliability.
Free consultation with an IGS Subject Matter Expert
Whether you’re experiencing recurring tube failures, excessive erosion, or looking to extend runtime between outages, IGS can help.