System Design
6
ThermJet, V2, Technical Information, Edition 2.14
Design
Designing a burner system is a straight-forward exercise
of combining modules that add up to a reliable and safe
system.
The design process is divided into the following steps:
1. Burner model selection:
2. Control Methodology
3. Ignition System
4. Flame Monitoring System
5. Combustion Air System
6. Main gas shut-off valve train selection
7. Process temperature control system
Step 1: Burner Model Selection
Burner Size and Quantity
Select the size and number of burners based on the heat
balance. For heat balance calculations, refer to the
Combustion Engineering Guide (EFE 825).
Use the ThermJet Price List 205 and Datasheet series
205 for performance data, dimensions, and specifications.
Flame Velocity
Each burner size comes in two versions, High or Medium
Velocity. Select the version needed based on
requirements for temperature uniformity, circulation,
chamber size, air pressure and overall operating costs.
Flame velocity information is available in Datasheets
205-1 through 205-13.
Fuel Type
Table 3.1 Fuel Type
If using an alternative fuel supply, contact Eclipse with an
accurate breakdown of the fuel components.
Fuel Pressure
The gas pressure must be at the minimum level shown.
The required gas pressure at the burner can be found in
ThermJet Datasheets 205-1 through 205-13.
Combustor Type
The combustor that you choose depends on the
temperature and the construction of the furnace.
The furnace temperature limits of the combustors can be
found in ThermJet Datasheets 205-1 through 205-13.
■
For tangential firing furnaces, do not use alloy
combustors.
Fuel
Symbol
Gross Heating
Value
Specific
Gravity
WOBBE
Index
Natural
Gas
CH
4
90%+
1000 Btu/ft
3
(40.1 MJ/m
3
)
0.60
1290
Btu/ft
3
Propane
C
3
H
8
2525 Btu/ft
3
(101.2 MJ/m
3
)
1.55
2028
Btu/ft
3
Butane
C
4
H
10
3330 Btu/ft
3
(133.7 MJ/m
3
)
2.09
2303
Btu/ft
3
Btu/ft
3
@ standard conditions (MJ/m
3
@ normal conditions)
CAUTION
3
