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Pulverised Fuel Balancing Systems

Improvement of fuel distribution across the burner zone (and across the boiler load range) is key to delivering improved combustion performance and associated coal-fired boiler performance optimization.

This is achieved through measurement and understanding of fuel flow and associated velocity specific to each burner’s pulverised fuel (PF) pipe configuration followed by the necessary adjustment to fuel flow using appropriate flow-balancing technology. This helps facilitate improved alignment of air flow and fuel flow thereby helping to establish the required air-to-fuel ratio (AFR).

/media/systems/library/perspective1.jpgAddressing improved fuel distribution and associated burner-to-burner AFR is fundamental to managing emissions to air such as NOx, and CO particulates etc. It is also fundamental to addressing other combustion performance-related challenges associated with fireside corrosion, carbon-in-ash as well as slagging and fouling within the furnace. Delivery of improved  combustion stability is also fundamental to improved flexible operations and minimum stable generation (MSG).

In addition to fuel distribution, PF particle size distribution can have a significant impact on burner combustion performance. Good management of PF particle size distribution through appropriate management of the milling system is essential.  Therefore, online measurement and monitoring of mill exit PF particle size distribution will help facilitate appropriate mill management and help ensure fuel is delivered to the burner zone at the required particle size distribution.

/media/systems/library/didcot.jpgWhilst addressing and managing key influencing factors such as burner-to-burner fuel distribution, fuel quality and particle size distribution is essential to delivering improved combustion performance with commensurate improvement in boiler  performance, there are other factors that must be addressed. Management of combustion zone stoichiometry (theoretical plus excess air necessary for complete combustion) and flexible loading are further key elements that must be addressed.

Combustion zone stoichiometry is managed via the addition of appropriate primary and secondary air flow to the furnace. Getting the balance right is extremely important but is often undermined via excessive 'uncontrolled' furnace air ingress (tramp air) or in-leakage at other locations such as the air-heater and duct seals.

The key to facilitating improved combustion performance is the balancing of fuel distribution across the burner zone, management of fuel quality and PF particle size distribution and minimising uncontrolled air ingress to ensure the combustion zone operates at the required air-to-fuel ratio.

Products and Systems

  • G-CAM® and H-CAM - Carbon-in-ash analysers for flue gas and hoppers
  • CoalFlo® Damper - PF balancing damper for multi-outlet mills
  • GA200® - Advanced acoustic steam leak detection system
  • GravMaster® - Pressurised gravimetric feeder
  • MillMaster® - Particle size analyser
  • PfMaster PFMS® - Pulverised fuel monitoring system
  • VARB® and Control-Gate® - PF diffuser and balancing system