System Design; Design; Step 1: Burner Selection - Eclipse TFB030 Manual

System Design

Design

Design Structure
Designing a burner system is a straight-forward exercise
of combining steps that add up to a reliable and safe
system. These steps are:
1. Burner Selection and Tube Design
2. Control Methodology
3. Ignition System
4. Flame Monitoring System
5. Combustion Air System: Blower & Air Pressure
Switch
6. Main Gas Shut-Off Valve Train
7. Process Temperature Control System

Step 1: Burner Selection

The design of a combustion system for radiant tubes and
immersion tubes is significantly different. For this reason,
we have divided the process for burner selection into two
separate sections:
• Step 1a: Radiant Tube Burner Application on page 6
• Step 1b: Immersion Tube Burner Application on
page 8
All individual burner
dimensions, capacities, operating parameters, and
emissions information can be found in the following
Datasheets:
• 310-1 Datasheet TFB030
• 310-2 Datasheet TFB075
• 310-3 Datasheet TFB200
Fuel Type
The usable fuel types are:
• Natural Gas
• Propane
• Butane
For other fuels, contact Eclipse with an accurate
breakdown of the fuel contents.
Air Type
• Ambient
• Preheat
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performance data including
Step 1a: Radiant Tube Burner Application
Calculate the required heat release per tube.
Given the net heat requirement of the furnace (BTU/hr),
divide by the number of radiant tubes to determine the
required heat release per tube.
Calculate the tube surface area.
The burner radiants its heat to the process through the
wall of the tube. To calculate the required burner input you
must know the total area of the tube inside the furnace.
To calculate the tube surface area, use this formula:
Tube Surface Area = OD x  x n x L
• OD = the outside diameter of the tube in inches
•  = 3.142
• n = number of tube legs
- 2 for a U-Tube
- 3 for a trident tube
- 4 for a W-tube
• L = the total length of each leg in inches
U-tube
Trident tube
W-tube
Figure 3.1.
Determine the Maximum Heat Transfer Rate
The maximum heat transfer rate is the maximum amount
of heat that the tube can radiate to the process per time
unit.
Eclipse TFB, V2, Design Guide 310, 11/14/2014
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