Burners Quiz Flashcards
What does the term “rapid carryover of flames” refer to?
when gas burner flame must pass smoothly over burner surface from one burner to the next
What does the term “wide turndown ratio” refer to?
range of inputs for proper combustion
Why would immediate ignition not occur and what could be the result?
clogged burner ports
What does the terminal “flow velocity” refer to ?
Rate at which the gas-air mixture leaves the burner
What does the terminal “flame speed” refer to and what are two ways that we can measure flame speed?
speed at which a flame moves through a fuel-air mix
- Bunsen burner method
- test tube method
In combustion, three things (the three T’s) are needed in order for proper combustion to occur. They are and what does each refer to?
- time - in order for comb
- temperature - enough flame for comb
- turbulence - mixes
How does the primary air supply affect the characteristics of the flame?
too much or too little will affect colour and shape
What is port loading?
amount of gas-air mixture passing through a port
What is “flashback” and what conditions could cause flashback? how could we correct flashback?
inverted cone int the burner caused by reduction in gas flow which must be increased
What is “flame liftoff” and what conditions cause flame liftoff? How could we correct flame liftoff?
- when gases don’t burn and flames are high
- over firing the burner
- correct the burner input
What is “waving flame”?
when flame is pushed off burner by excessive air movement
What is a “floating flame”?
- lazy flame with undefined cones reaching for air (incomplete combustion)
What is “flame rollout” ?
when flames roll out of combustion chamber
What is the difference between an aerated pilot and a non-aerated pilot?
aerated injects primary air before ignition - generally more stable and burns hotter
type of aerated pilot that draws primary air through a duct or tube - incinerates any dust or lint?
incinerating pilot
