The latest design of Walrad radiant wall burner is a result of the continued commitment Hamworthy have shown to the development of new and existing products.

Objectives:

The main objectives of the Walrad burner enhancement were: To further reduce NOx to meet the ever tightening emission legislation  Eliminate cracking of the gases (coking) within the secondary fuel staging pokers, commonly associated with fuel staged burners  Restrict the potential for gases burning back within the burner (flashback), a known problem with premix style burners

Ultra Low NOx:

The Walrad achieves ultra low NOx levels by fuel staging of the main flame. A single gas poker is used to severely stage the flame region where NOx formation is most prominent allowing legislation to be met in every country.

Elimination of Coking:

The single gas poker has been designed to ensure the volume and velocity of gases passing through the poker is sufficiently high thus avoiding the possibility for the gases to reach the temperature at which cracking occurs. This allows heavy gases to be fired without the risk of constant blocking of the poker.

Reduction of Flashback:

Using dynamic flow modelling techniques a main gas nozzle has been designed to ensure an even flow of gases within the nozzle. This design in conjunction with an optimum-drilling pattern allows: 

• The flame front to sit further away from the nozzle reducing the potential for flashback 
• Increased nozzle life by reducing surface temperatures 
• A wider range of fuel gases to be fired 

• Liberation up to 515,000 kcal/h 
• Ultra low NOx 
• Increased nozzle life due temperatures 
• Elimination of coking within the secondary gas poker 
• Capable of firing wide range of fuel gases 
• Minimal excess air (5%) 
• Ultra-efficient 
• Low noise - typically less than 74 dB'A' SPL 

• All stainless steel construction avoids complex paint requirements and eliminates corrosion 
• Weight less than 15Kg per burner allows a single person to handle the unit