Industrial refractory veneering is a method of applying a thin refractory protective layer (veneer) over an existing furnace or kiln lining instead of completely replacing the refractory.

A high-temperature insulating or protective layer is applied onto worn refractory surfaces, commonly using:

• Ceramic fiber blankets
• Refractory coatings
• Gunning castables
• Spray-applied monolithic materials

The goal is to:

• Extend refractory life
• Reduce shutdown time
• Improve thermal efficiency
• Delay expensive relining work

Examples:

• Apply castable directly over existing refractory without anchors
• Rapid repair method for cement kilns before major shutdowns

Typical applications:

• Cement kilns
• Fired heaters
• Forge furnaces
• Glass furnaces
• Hot gas ducts
• Incinerators
• Lime kilns
• Petrochemical crackers
• Reheat furnaces

Main benefits:

• Energy savings
• Reduced downtime
• Extends refractory life
• Emergency repair capability

Limitations:

Refractory veneering is usually a maintenance/extension solution, not a permanent substitute for full relining. It may not work well if:

• Structural refractory collapse exists
• Severe anchoring failure occurs
• Large-scale brick spalling exists
• Chemical penetration is already deep

CRVT™ (CEMAX Refractory Veneering Technology)

CRVT is CEMAX’s engineered refractory veneering system designed to extend campaign life, reduce shutdown duration, energy saving, cost saving, and improve thermal efficiency for high-temperature industrial operations.

Who would appreciate CRVT

Plants with continuous operations who would lose huge money when furnaces or boilers stopped

• Palm oil biomass boilers
• Petrochemical
• Power generation
• Refineries
• Steel and metal smelters
• Waste incinerators

What is CRVT

• Special blended gunning products, proprietary machineries, and skilled installation team
• Refractory repair on worn working linings to reach original working lining thickness again
• Approximate thickness
  • Maximum 100 mm on vertical lining
  • 70 mm on horizontal lining
  • Minimum 25 mm (It is more than make-up!)

Why are we recommending CRVT

• Fast commissioning
• Energy saving due to short heating-up
• Cost saving due to low refractory consumption, and repeatable process

Where is the application area for CRVT

• Static aggregates area
• Rotary furnace (only in emergency to prolong operation until next planned shutdown)
• Best performance in the low abrasion zones
• On working lining only

When is perfect to apply CRVT

• In planned shutdown
• Emergency situations (to run furnace until next planned shutdown)

How to apply CRVT

• Assessment on existing lining (very important)
• No need of demolition
• No requirement of new insulating lining and new anchors
• With standard dry dense gunning equipment set-up