What are Boiler Tubes Erosion Shields?
Boiler Tubes Erosion Shields (also known as Anti-wear Covers, Antiwear tile, Wear Protection Plates, Anti-wear Shields, Anti-wear Cover Plates, Anti-corrosion Cover Plates, Boiler Climbing Pipes, or Wear-resistant Pressure Plates) are essential accessories for heating surface tubes in power plant boilers. They are used in combination with Snap Rings.
Application Locations & Functions
Erosion Shields are primarily installed on the windward side of heating surface tubes such as:
- Superheaters
- Reheaters
- Economizers
- Water-cooled Wall Pipes
- Induced Draft Fan Blades (special design)
Their key functions are:
- Protecting boiler pipes from particle impact erosion
- Reducing pipeline wear
- Extending the service life of heating surface tubes
These are specialized boiler accessories, most commonly used in power station boilers, with limited application in small boilers. Some coal chemical industry equipment also utilizes them.
Service Life of Erosion Shields
The service life varies by boiler type and installation location. Typically, it aligns with the boiler’s overhaul cycle (3 to 5 years). During each maintenance, partial erosion shields are replaced or retrofitted based on:
- Severe thinning beyond tolerance limits
- Detachment during operation due to insecure initial installation
- Severe deformation compromising protection capability
Additionally, shields are retrofitted onto uncovered tubes if inspection reveals wear progression, preventing boiler tube bursts.
Materials for Erosion Shields
Material selection must consider the operating environment, working conditions, and media properties. Key materials include:
| Category | Grade | Properties & Applications |
|---|---|---|
| Stainless Steel | 304 | Good corrosion/heat resistance; general corrosive environments |
| 316L | Superior chloride corrosion resistance; chemical/marine applications | |
| 321 | Titanium-stabilized; resists intergranular corrosion; high-temperature zones | |
| 310S | Excellent high-temperature oxidation resistance; furnace chambers (>800°C) | |
| Heat-resistant Steel | ZG40Cr25Ni20Si2 | High-temperature strength & oxidation resistance; furnace wear parts |
| HK40 | Used for furnace bed plates & erosion shields | |
| Alloy Steel | Cr/Ni/Mo-alloyed steels | Enhanced wear/corrosion resistance & high-temperature performance |
Custom anti-corrosion protective layers for boiler tubes are also available.
Specifications & Manufacturing
Key Parameters:
- Thickness: 2mm, 3mm, 4mm, 5mm (selected based on wear severity and thermal conductivity needs)
- Cross-section:
- Semi-circular (180°) for smooth tubes
- 120°–160° for finned tubes (e.g., water-cooled walls)
- Types:
- Straight shields
- Inner/outer-curved shields
- Side-curved shields
- S-curved shields
- Length: 20mm–3000mm (common: 1000–2000mm)
- Inner Diameter: Tube outer diameter + 1–3mm (thermal expansion allowance)
Bent Shield Requirements:
Design drawings must specify:
- Tube outer diameter (OD)
- Bend radius R (to tube centerline)
- Bend angle
- Straight segment lengths on both sides of the arc
Manufacturing Process:
- Press-formed using high-pressure machines and professional molds
- Bent shields: Press-formed or bent on specialized tube benders
- Features: Smooth surface, aesthetic finish, excellent weldability (no weld detachment)
Snap Rings:
- Opening angle: 190°–200° (vs. shield’s 180°)
- Quantity: 2–4 per shield, spaced 200–500mm apart
- Installation: Overlapped and welded to shields
When it comes to updating your boiler antiwear tile, choosing the right supplier and manufacturer is crucial to ensure high quality and reliability. In this regard, DHBBOILER is your ideal choice. We are a professional company with over 20 years of experience in the production of boilers and boiler accessories, dedicated to providing excellent products and services.
Our strengths include:
- Rich Experience: With over 20 years of experience in the field of boilers and boiler accessories, we understand and can cater to a variety of customer needs.
- Professional Design Team: We have an experienced design team capable of providing customized solutions to ensure the new antiwear tile perfectly suits your specific application.
- High-Quality Materials: We prioritize the quality and reliability of materials, ensuring that your antiwear tile exhibits exceptional durability and performance.
- Diverse Product Range: We offer various types of boiler antiwear tile to meet the needs of different boilers. Whether your application is industrial heating, power generation, or another field, we can provide the best solution for you.
At DHBBOILER, we are committed to delivering high-quality products to ensure the stable operation and energy efficiency of your boiler. If you are considering updating your boiler antiwear tile, we welcome you to get in touch with us. We will provide professional advice and excellent products. Choose DHBBOILER for reliability and quality.
