Pulse Firing - Hauck Manufacturing

Pulse Firing
Combustion Control Methods for
Maximum Productivity and Efficiency
Edition 05.10
www.kromschroeder.com

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.

Pulse Firing · Edition 05.10 · 3
Robust burners and controls
designed for the high cycle
demands of pulse fi ring.
Burners
Pulse fi ring control maximizes the technological
advancements of high velocity burners
like the Hauck SVG burner and BIC/BIC..L
burner from Kromschroder as well as the
unique fl ame geometry characteristics of the
Hauck WHG and RFG burners.
High Velocity SVG
our own. From valves, regulators, fl ame safety
and burner control units, Hauck has the
full array of Kromschroder controls to meet
the control requirements of your specifi c application.
High Cycle Air/Gas Valves
Kromschroder BVHM/MB , VR Air Solenoid,
VAS Gas Solenoid
Pulse Ratio Regulator
Kromschroder GIK, VAG Combination Valve
VAG
SVG Burner
– Refractory, ceramic and alloy tile options
– Low emissions (NOx, VOCs and aldehydes)
Kromschroder BIC..L
– GIK maintains constant air/gas ratio
over wide turndown ranges
– VAG has integrated safety valve in an
all-purpose regulator for ease of installation
with minimal space requirement
Flame Safety Options
BIC..L
– High exit velocity
– Wide performance range
– Available in extended lengths
Flat Flame WHG
– Flat fl ame profi le throughout entire fi ring
range, even when pulse-fi red
– Even heat distribution with no fl ame impingement
Radiant Tube RFG
– Designed for use with RADimax recuperator
for maximum effi ciency
– Excellent fl ame stability and tube temperature
uniformity
Controls
Kromschroder controls are designed to handle
the high cycle demands of pulse fi ring
operation and have been used successfully
with many competitor‘s burners as well as
19” Rack
Kromschroder BCU, PFU 19” Rack System,
IFD 258
– BCU features ignition transformer, display,
indicators and operating controls in
a compact unit
– IFD offers fl ame control with diverse installation
possibilities
– PFU provides a 19-inch rack system for
control panels when combined with MPT
impulse controller and is ideal for pulse
fi ring
Pulse Logic Controls
Kromschroder MPT-700 (installed in PF-19” Rack
System) or PLC based systems
– Converts controller signals to pulse cycles
for gas burners
– Linear ratio between controller signal
and burner capacity

What is Pulse Firing?
Pulse firing is a firing method for a multiple
burner combustion system. Pulse firing
controls thermal input by cycling burners
between two settings, high and low or high
and off, to meet the required heat demand.
An air solenoid valve at each burner with
adjustable minimum and maximum settings
replaces the typical linkage controlled modulated
zone air valve. If cycling burners high
to low, low fire gas input is set via a bypass
in or around the pulse regulator.
The burner is ignited at low fire. Each time the
air solenoid is energized, the burner switches
from low fire to high fire operation. This uses
the entrainment and stirring action benefits
of high velocity burners to their best advantage.
Also, since the air and fuel piping to
each burner is identical, changing the pulsing
sequence or even moving a burner from one
zone to another is all done electronically as
opposed to mechanically which simplifies air
and gas piping requirements.
Hauck Manufacturing Company
Kromschroeder Controls
PO Box 90
Lebanon, PA 17042
United States
T +1 717-272-3051
info@hauckburner.com
www.hauckburner.com
www.elster.com
www.kromschroeder.com
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