Selection Criteria for Furnace Burners

How to select the ideal furnace burner?

When selecting the ideal burner for your application it is necessary to take into account the design characteristics of the application, the performance criteria and the following considerations:

• Do not sacrifice uniformity by optimizing just a few burners.
• Select and define better burner position, ensuring full understanding of the application and all its requirements.
• Precisely determine and calculate the thermal capacity that the heating process really demands.
• A standard cubic foot of air will always release 100Btu, regardless of the fuel used.

The points we must review in order to choose the correct burner are as follows:

• Application, or process to perform
• Fuel(s) available
• Possible design limitations
• Control method
• Furnace/oven casing considerations
• Process considerations
• Number of burners to be used
• Where they will be located
• Capacity required to do the job

In this article we will talk about the different types of burners, their characteristics, design principles and existing models.

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High Velocity Burners

These burners have the following characteristics:

• Convection heating
• Approximate 340mph (150m/s) velocity
• Excess air capacity >3000%
• High operating range
• Suitable for preheated air up to 900°F (480°C)
  

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Nozzle Types

H – High Velocity
R – Round Nozzle

• Ideal for fiber or refractory brick walls
• Temperatures up to 2800°F (1540°C)
• Preheated air up to 900°F (480°C)

H – High Velocity
S – Rectangular Nozzle

• Ideal for refractory brick walls
• Ideal replacement for older burners
• Temperatures up to 2800°F (1540°C)
• Preheated air up to 900°F (480°C)

H – High Velocity
C – Ceramic Nozzle

• Compact and lightweight silicon carbide
• Ideal for fiber wall replacements
• Temperatures up to 2500°F (1370°C)
• Preheated air up to 900°F (480°C)

H – High Velocity
A – Alloy Nozzle

• Compact and lightweight silicon carbide
• Ideal for fiber wall furnaces using ambient air
• Temperatures up to 1900°F (1040°C)

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Forward Flame Burners

These burners have the following characteristics:

• Radiation heating
• Approximate velocity of 60mph (27m/s)
• Limited excess air capacity
• Process temperatures up to 2800°F (1540°C)
• Dual fuel (gas/oil) models
• Suitable for preheated air up to 900°C

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Flat Flame Burners

These burners have the following characteristics:

• Radiation heating
• No forward velocity
• Flame size ratio of 1/0.1 (length/diameter)
• Process temperatures up to 2800°F (1540°C)
• Suitable for preheated air up to 900+°F (480+°C)

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Radiant Cone Burners

These burners have the following characteristics:

• Radiation heat transfer, with localized flame
• Compact, short flame
• Process temperatures up to 2800°F (1540°C)
• Suitable for preheated air up to 900+°F (480+°C)

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Ultra-Low Emission Burners

These burners are ideal for combustion air staging.

At NUTEC Bickley we work hand in hand with the Fives North American brand and its LNI (Low NOx Injection) technology.

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Radiant Tube Burners

These burners have the following characteristics:

• Ideal for applications requiring indirect firing
• Radiation heat transfer
• Long flame burner design, for uniform tube heating
• Available with plug-type heat recuperator
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At NUTEC Bickley we are experts in the design of safe equipment using the latest combustion technology. Get in touch with our advisors to help you operate more safely and select the ideal industrial furnace burners for you.