Step 3: Control Methodology - Eclipse WX Series Manual

Step 3: Control
Methodology
Air
Excess
Gas
Figure 3.3 Air:Gas Flow
12
All standard Winnox burners are designed for:
• air:gas ratio controlled combustion
• 50% excess air at high fire
• higher excess air at low fire
Burner Control
Winnox burners come with a ratio regulator that maintains the
air:gas ratio. An integral minimum fuel bypass line is used to
maintain and control a reliable low fire input flow.
Figure 3.4 Basic Burner Components
air
Integral Air BV
Minimum Fuel
By-Pass Line
• A control signal is sent from a process temperature controller
(sold separately) to the control motor. (Refer to Bulletin 818C
or contact Eclipse for further information on temperature
controllers.)
Figure 3.5 Basic Control Loop
Set Point
• The control motor modulates the integral air butterfly valve
(BV) which controls the combustion air flow.
• Air pressure in the burner body sends an impulse down the
loading line to the ratio regulator.
• The ratio regulator controls the gas flow in proportion to the air
flow.
Warning:
Do not use other control methods, such as, a fixed-air
control, and do not alter the ratio regulator or burner
piping without prior approval from Eclipse.
Process
Control
Control
Controller
Motor
Signal
Gas Flow
Process
Eclipse Winnox WX Series v1 Design Guide No. 111, 9/25/2008
Control Motor
Ratio Regulator
Integral air
BV
Ratio
Regulator