Pulse Firing - Hauck Manufacturing

2 · Pulse Firing · Edition 05.10
Benefits of Pulse Fired Control
Systems
Typical Pulse Fired System
solenoid valve with
integrated pulse regulator
ball
valve
solenoid
valve
limiting
orifice
high fire
bellows
unit
burner
air butterfly
valve
limiting
orifice
high fire
to other
burners
Pulse Firing is a specialized type of combustion
system control that offers significant
process and productivity benefits.
– Fuel savings
– Improved temperature uniformity
– Lower NOx emissions
– Versatile control schemes
– Improved turndown
– Suitable for heating and cooling cycles
Fuel Savings
With the burners operating on-ratio and at
their most efficient firing setting (high fire),
ideal operating conditions are achieved for
maximum heat transfer with minimal fuel input.
Improved Temperature Uniformity. Pulse
fire control facilitates the highest level of convective
heat transfer to the load and mixing of
atmosphere within the furnace chamber by
firing the burners at their highest exit velocity.
This results in superior temperature uniformity
and the highest product quality.
Lower Emissions
Because the high velocity burners of pulse
fired systems operate at high fire with low
excess air, NOx emissions are minimized as
the high velocity flame entrains the maximum
amount of furnace gases for more complete
mixing and lower peak flame temperatures.
Control Design Flexibility
A pulse fired system can be designed to accommodate
even the most stringent temperature
uniformity and application requirements
allowing maximum system turndown
to be achieved whether your furnace hold
temperature is 800ºF or 2300ºF.
Maximized Productivity
By utilizing the system’s burners at their
most efficient firing rates, maximum energy
is transferred to the furnace load in the least
amount of time resulting in improved productivity.
25% Heat Demand
A1
A2
25 %
A3
A4
A typical four-burner system with a set high
fire time of six seconds would be represented
as shown in Figure 3. At any point, one of
the four burners (25%) is at high fire, with
the remaining three burners at low fire or off.
50% Heat Demand
A1
A2
50 %
A3
A4
As the heat demand increases from 25% to
50%, the same four-burner system would
now look as shown in Figure 4. Two of the
four burners (50%) are now at high fire at any
point in the cycle. These are typical examples.
Our experience has shown that many
applications require custom firing solutions
to meet specific production requirements.
Pulse Firing and Burner
Geometry
Pulse firing control maximizes the advantages
of High Velocity Burners and burners
designed for specific flame geometry.
Pulse firing enhances tube temperature
uniformity extending the tube life of Radiant
Tube Burners.
Flat Flame Burners can be operated at maximum
pressure and maintain their designed
flame shape.
On-off pulse fired control is the required
method of firing for modern Self-Recuperative
Burner systems.