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Flue Gas Conditioning Systems

Sulfur Trioxide FGC Systems

Hundreds of these systems are in operation worldwide to reduce flyash resistivity when burning low to medium sulfur coal. Elemental sulfur is burned in air to form sulfur dioxide gas which is then catalytically converted to sulfur trioxide gas and injected into the flue gas stream ahead of the precipitator. Typical injection rates are 5 to 10 ppm (about 40 to 80 lb/hr sulfur feed for a 600 MW boiler). Sulfur is available in either molten or solid form. Molten sulfur (readily available in most industrialized countries) is preferred because of lower cost, less handling and higher system reliability.

The energy consumption of our patented sulfur burning system is a little less than 10% of other systems and requires 50% less process air. As a result, both installation and operating costs are lower.

Advantages of Chemithon SO3 FGC Systems:

  • High gas strength design for lower installation and operating costs
  • SO2 cooler for optimum converter performance
  • variable-speed PD blower for optimum process air control
  • Precise control of conditioning-agent fee rate
  • Two-stage converter for 96 to 99% conversion efficiency
  • Automatic microprocessor control with one-button start-up
  • Complete skid mounting, wiring and shop testing for fast, low-cost installation
  • Rugged construction for highest availability
  • Scope of supply from equipment only to turnkey installation

Retrofits of Flue Gas Conditioning Systems

Modern FGC systems are far more reliable, more efficient and offer lower operating costs than older systems. Retrofitting to modern designs can dramatically improve precipitator performance and reduce the potential for expensive plant derates (often recovering the cost of retrofitting in a matter of weeks or months).

The most common retrofits are:

  • PLC-basaed control systems to replace outdated ratio-type control systems
  • In-tank sulfur pumping systems for existing sulfur tanks to eliminate inaccurate, high-maintenance and messy external sulfur pumping systems
  • Molten sulfur feed systems to replace unreliable, high maintenance granular sulfur feed systems
  • Injection probes to uniformly distribute sulfur trioxide
  • Replacement sulfur burners or converters to improve performance




For More Information:

Hal Busick
Manager of Sales



Flue Gas Conditioning

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Matimba Stack Berfore

Matimba Stack After



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