Banner-Day Bakery Solutions

Historically, direct fired gas tunnel and tray ovens were designed to use constant spark ignition (CSI) systems that used flag ignitors.  In the mid-80’s it became apparent to Banner-Day that flag type ignitors were not adequate, particularly as bakers considered the application of more advanced direct spark ignition (DSI) technology  for their ovens.

flag ignitors

 So what were some of the issues with flag ignitors?  Here are a few:

  • They were typically located under the main and stabilizer chains where graphite could fall/accumulate on the ignitor.
  • Graphite works its way into the electrode and as a good current conductor, provides a good path to ground and shorts out the ignitor which is a common problem.
  • Ribbon burners experience significant movement when heated as a result of thermal expansion.  The ignitor is fixed to the burner and requires regular and frequent adjustments to the ignitor to maintain proper spacing with the burner. 
  • High labor cost to maintain.

The development of direct spark rectification ignitors (DSI) overcame all of these issues.  More importantly with this development this rectification ignitor enabled the development and expansion of DSI on tunnel and tray ovens.  DSI has become the platform for oven automation and is the principle requisite to consistent burner performance, providing the ability to turn individual burners on and off on a repeatable and reliable basis.

20a Rec Ignitor copy

What do direct spark ignitors do for the baker?

  • Retain their position with the burner when properly adjusted at installation
    • Does not require regular adjustments, as with flag ignitors
    • Maintains operating relationship with the burner under all conditions
  • Eliminates graphite contamination
  • Guides the air/gas flow to the spark gap for positive ignition
  • Provides a strong flame signal
  • Eliminates frequent and costly ignitor adjustments and maintenance 

What in the design and construction of the ignitor makes it so effective:

  • The electrode is protected from contamination by a stainless steel sleeve.
  • Ventilation holes allow the sleeve to breathe and eliminate any moisture that develops during operation.
  • The design allows it to spark to itself eliminating shorting to the burner.
  • The gimbal bushing, allows free movement, enabling the ignitor to maintain adjustment throughout normal heating and cooling (expansion and contraction) of the burner.
  • It sparks to the integral ground flag similar to a spark plug in a car.
  • Ignitor ground flag is shaped to capture the air/gas mixture and direct it through the spark gap, producing consistent and reliable ignition.
  • The knurled electrode end concentrates energy to a knife-edge on ground flag for a stronger spark.
  • High ratio of ground flag surface to flame rod (ignition electrode) produces a strong flame signal.
  • The B-D ignitor is visible through the burner observation port making it easy to adjust.  Once adjusted it holds its position and does not need to be readjusted.

The following photos show Banner-Day direct spark ignitors at work.  You can see that even with a significant graphite build-up, the ignitor maintains its spark and burner flame.

   
  

 In summary, the rectification-ignitor significantly improves oven performance and provides you with a highly reliable platform to automate your oven.  Very seldom do they need replacement when used under typical oven conditions.  If you are not using this ignitor, it may be the right time to explore.

 

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