Parts and Services for ATRITA® Pulverizers

Alstom provides the quality and resources of an OEM while backing our products with comprehensive support. Our products and services are designed to help our customers meet the performance, availability and reliability requirements for their ATRITA® mills, including:

• Rebuild and Repair Services
• Performance and Availability Upgrades
• Replacement Parts
• Asset Planning and Life Cycle Analysis

ATRITA Rebuild and Repair Services

Complete Rotor Assemblies and Rebuilds

Alstom can supply new Rotor Assemblies or rebuild existing assemblies incorporating upgrades to address operational or performance issues. Alstom stands ready to work with owners of ATRITA Pulverizers to design a rotor spares program that meets their specific goals.

• Benefits to User

• Reduced cost versus new equipment
• Shorter lead time
• Immediate availability of rotor components
• Reduced outage time

Performance and Availability Upgrades for ATRITA Mills

Robotic Double Weld Overlay Hammers

The Alstom weld overlay is a chromium carbide base electrode applied to the standard swing hammers that significantly increases wear life. This corrosion and erosion resistant overlay contains a chromium carbide content greater than 18%, resulting in 60-62 Rockwell C hardness that makes it capable of handling severe impact applications.

• Advantages

• Significantly more erosion resistant than the standard hand-applied overlay
• Weld can be applied to standard manganese hammers (existing customer inventory)
• Robotic application ensures part uniformity
• Benefits to User

• Up to double the operational wear life – longer periods between hammer replacements
• Less component wear downstream
• Longer component service life throughout the mill
• Improved fineness resulting in less unburned carbon
• Double the life and improved coal fineness

CT4 White Iron Alloy Castings

• CT4 is a white iron alloy with a high chromium content used in:

• Wear plates
• Crusher blocks
• Breaker plates
• Periphery liners
• Fan blades
• Fan bolt guard
• Advantages

• Superior wear
• Superior toughness
• Less brittle resulting in less cracking during installation
• Benefits to User

• Extended operational life
• Longer periods between part replacements
• Better coal fineness resulting in less unburned carbon
• Improved coal fineness and capacity over a longer period

Star-Tip™ Tungsten Carbide Products

• Features

• Tungsten carbide tiles brazed on the impact side
• Advantages

• Significantly extends the operational wear life of the components
• Improves fuel grindability on both the first and second effect side of the grinding section
• Benefits to User

• Longer component service life throughout the mill
• Improved fineness resulting in less unburned carbon
• Now standard for:

• Impeller clips
• Grinding clips
• Stationary pegs
• Rejector arms

Ship Lapped First Effect Wear Plates

Alstom has redesigned the standard first effect wear plates to an overlap or ship lapped design. This design eliminates the gap between the wear plates and redirects the wear from the rotor disc to the wear plate itself.

• Advantages

• Direct replacement for the original design first effect wear plates
• Cast from CT4 abrasive resistant material to extend component life
• Eliminates wear between the wear plates that occurs with the original design
• Benefits to User

• Eliminates costly weld repair to the rotor disc
• Eliminates costly "shaft out" maintenance needed to replace the rotor disc
• Eliminates costly repair and maintenance of the rotor disc

Vacuum Bonded Ceramic Lined Fan Blades

Ceramic lining is the best wear solution for high erosion, low impact locations. Alstom's DYNAWEAR™ Products provide this solution.

• Features

• Abrasion resistant ceramics – (DYNAWEAR II™ Product) affixed to a fabricated fan blade
• Tungsten carbide on leading and trailing edges available
• High wear areas (webs and corners) reinforced with ceramic tile
• Advantages

• Significantly outlast traditional castings
• Direct replacements for cast fan blades
• Benefits to User

• Extended operational life of fan blades
• Reduced maintenance costs

Vacuum Bonded Ceramic Fan Housing Side Liners

Alstom provides high wear fabricated fan housing side liners with ceramic tiles bonded to a steel fabrication. Liners fabricated in this manner will significantly outwear conventional cast liners.

• Features

• Abrasion resistant ceramics – (DYNAWEAR II™ Product) bonded to a fabricated steel plate
• Liners can be installed along side conventional castings
• Advantages

• Significantly outlast traditional castings
• Direct replacements for existing castings
• Design enables customer to mix ceramic fan liners with castings in the same fan section
• Benefits to User

• Extended operational life
• Reduced maintenance costs
• Direct replacement with longer life

Reaction Bonded Silicone Carbide Periphery Fan Liners

Reaction bonded silicon carbide ceramic offers excellent wear resistance while exhibiting increased fracture toughness. This material is recommended for applications at temperatures below 450° F and is well suited for applications that experience erosion due to high velocity impingement such as coal and ash handling components.

• Advantages

• Excellent fracture toughness
• Resistant to high velocity erosive impingement
• Direct replacement for cast liners
• Benefits to User

• Greatly reduces fan section maintenance and costs
• Greater than double the operational wear life of standard cast liners
• More than twice the life of standard cast liners

Bolt Head Protectors

Bolt head protectors designed by Alstom are easily installed to protect the crusher rotor assembly fasteners during operation.

• Advantages

• Provides fastener protection in the crusher section
• Easily installed
• Prevents bolt head wear during operation
• Benefit to User

• Prevents costly mill crashes due to bolt head erosion
• Simplest way to prevent costly mill crashes