Product/Service

Thermal and Catalytic Oxidizer-Combu-Changer Regenerative Thermal Oxidizers

Source: Alstom Power, Raymond Operations
The Combu-Changer oxidizer requires considerably less space than other VOC removal technologies
Typical Applications

  • Process Converting, Coating and Laminating
  • Flexible Packaging and Printing
  • Tape, Film, Paper and Foil Coating
  • Web Offset Printing
  • Plastics/Expanded Polystyrene
  • Graphics Arts Drying
  • Rotogravure Printing
  • Tobacco Processing
  • Paint Finishing and Paint Spraying
  • Chemical and Pharmaceutical Processes
  • Food Processing/Odor Control/Bakeries
  • Metal Litho/Coil Coating
  • Semiconductor and Micro-Electronics
  • Woodfinishing/Lacquering
  • Ground Water Remediation/Vapor Extraction
  • Textile Processes

Basic Diagram of the Combu-Changer Regenerative Concept

  1. Process VOC Laden Air Supply
  2. Poppet Control Valves force polluted VOC exhaust air to pass upwards or downwards through the bed before it reaches the exhaust stack
  3. Upper & Lower Air Distribution Plenums
  4. Heat Transfer Media
  5. Burner System for Startup Only
  6. Natural Gas Injection System for supplemental fuel
  7. Internal shop installed insulation
  8. Harmless water vapor and carbon dioxide
Combu-Changer Regenerative Oxidizer Advantages
  • Proven VOC Control with Over 500 Units Worldwide Since 1983
  • Reliable Burner System for Startup Only
  • Minimum 1800 Degrees F Oxidizer Temperature Provides Efficient VOC Control
  • 98% VOC Destruction Efficiency Minimum
  • 95% Primary Heat Recovery Including Casing Heat Losses
  • Flameless Compact Patented Inbed Oxidation Design (U.S. Patent No. 4,741,690)
  • Virtually No Nitrogen Oxide (NOx) and Carbon Monoxide (CO) Production
  • Expandable Design to Over 200,000 scfm Flow Rates
  • Reliable Pneumatic Poppet Valve Design with Only Two Valves
  • No Replenishment or Replacement of Stoneware, Catalyst, or Carbon Additives
  • Standard Programmable Logic controls (PLC), Shop Simulation Tested
  • Phone Modem Diagnostic Capability
  • Shop Assembled Modular Design with Minimal Field Installation
  • Affordable Capital, Installation, and Operating Costs
Space Requirements and Operating Availability

The Combu-Changer oxidizer requires considerably less space than other VOC removal technologies. A 60,000 scfm installation with two standard modules occupies about 1200 square feet of floor space and a volume of 8,400 cubic feet. A single ceramic regenerative oxidizer with the same capacity requires approximately 2,600 square feet of floor space and a volume of 46,000 cubic feet - more than five times the space.

Another advantage of a multiple-unit system consisting of individually dedicated Combu-Changer modules is operating availability. If it should be necessary to take a module off line, the remaining units and the process they serve can remain on line and still operate within compliance levels. On the other hand, if a large single oxidizer is taken off line, there is the potential of a total plant shutdown.

Single-Source Responsibility

  • Oxidizer units
  • Fans and stacks
  • Variable speed drives
  • PLC operating controls
  • Phone modem diagnostics
  • Process ducting
  • System balancing
  • Secondary heat recovery
  • Start-up and training
  • Systems design and engineering
  • Installation and erection

Alstom Power, Raymond Operations, 650 Warrenville Road, Lisle, IL 60532. Tel: 630-971-2500; Fax: 630-971-1076.