Maxon Telecom INDITHERM 550, INDITHERM 1800, INDITHERM 1500, INDITHERM 700, INDITHERM 100 User Manual
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Low temperature burners - INDITHERM
®
1-2.3-6
E-m-7/08
Specifications of INDITHERM® burners
Typical burner data
Fuel: natural gas at 15° C with 10.9 kWh/Nm³ HHV - sg = 0.6 [1]
Combustion air: 15° C - 21 % O2 - 50 % humidity - sg = 1.0 [1]
Stated pressures are indicative. Actual pressures are a function of air humidity, altitude, type of fuel, and gas quality.
Burner size & type 100 300 550 700 850 1100 1500 1800
back pressure
[2] mbar
Max. capacity [3] kW (HHV)
Min. capacity [
Pilot capacity
Combustion air differential pres-
[6]
sure
Combustion air flow
Gas differential press ure at i nl e t
[7]
Gas differential pressure at te st
connection
Flame length
4] kW (HHV) 0- 1.5 5.0 6.0 10 15 15 25 25 25
[5] kW (HHV) 0-1.5 7.5 10.0 15 25 25 40 40 40
mbar
m3/h
mbar 0 3.4 7.5 6.4 10.3 13.3 19.8 5.8 10
[8]
[9] m 0-1.5 1 1.2 2 2.1 2 2.3 2.6 3-4
mbar
0 125 340 550 720 850 1050 1472 1800
1.5 110 285 500 675 775 880 1266 1693
0 6.5 4.5 6.4 7.9 9 5 6.4 13
1.5 5 3.2 5 7.3 7.5 3.5 4.7 11.5
0 136 360 615 755 910 1 100 1611 1850
1.5 119 304 545 728 831 920 1386 1740
0 2.7 6.7 5.4 7.1 12 17.7 5.5 9.3
1.5 2.1 4.7 4.5 6.3 10 12.4 4 8.2
[1] sg (specific gravity) = relative density to air (density air = 1.293 kg/Nm3.
[2] Back pressure = static pressure in the combustion chamber where the flame develops. Data in this table are given for 0 and 1.5 mbar back
pressure.Combustion air flow valid for all listed maximum capacities.
[3] Maximum capacity when firing at 3% vol. O
[4] Minimum capacity without pilot gas. If lower minimum capacities are required, refer to chapter ‘minimum capacities’ in this section.
[5] With direct ignition (no pilot), start capacity should be equal or higher than the stated pilot capacity.
[6] Differential pressure measured between burner test connection and combustion chamber.
[7] Gas differential pressures for natural gas at burner inlet. This pressure should be available at burner inlet throughout the entire capacity
range.
[8] Differential pressure to be measured between burner test connection and combustion chamber.
[9] Flame lengths are derived from measured lab data. Actual flame lengths can differ slightly.
level in the flue gas.
2
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combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
Materials of construction
1
2
3
4
Low temperature burners - INDITHERM
®
1-2.3-7
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1 Housing Cast iron
Standard sleeve
2
High temperature block
3
Blower housing
4
Motor mounting bracket
AISI 310 (1.4841)
Castable refractory
Carbon steel
Carbon steel
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combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
Low temperature burners - INDITHERM
®
1-2.3-8
E-m-7/08
Selection criteria
Application details
Because of the burner’s versatility there are numerous types of applications for INDITHERM® burners. All types of indirect-fired
applications can be equipped with this simple, industrial burner. Among the major applications there are automotive paint-bake
ovens and surface treatment, bakery ovens and dryers for the food industry.
Available INDITHERM® burner versions and options
INDITHERM® burners are designed to operate on natural gas only.
All burners are available in ANSI and ISO version. Each version will have the main gas inlet connection following either NPT or ISO
standards.
All burners include an adjustable orifice needle valve for pilot flame fine tuning, provision for UV-scanner connection and a
stainless steel combustion sleeve.
Options
Every burner has a set of options available, according to the table below:
HTS High temperature discharge sleeve
FLR
DI
UVC
CBL
Combustion air filter box, recommended in extremely dusty surroundings
Direct ignited: in this case the adjustable orifice will be removed and the
pilot connection at the burner will be plugged
Burner flame scanner connection prepared for UV-scanner mounting
(scanner not included)
Connecting bracket and linkage for control motor mounting (control
motor make and type to be specified)
Exception:
FR
Flame rod, only to be used in limited number of applications, see
page 1-2.3-11
The spark ignitor is standard included on the burner.
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combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
Low temperature burners - INDITHERM
Process air
A
Burner designation
Burner type Burner size Burner gas connection Discharge sleeve Ignition Flame supervision
INDITHERM
®
300 ISO HTS DI UVC
®
1-2.3-9
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Burner size
100
300
550
700
850
1100
1500
1800
Burner gas connection
ISO: ISO threated
NPT: NPT threaded
Discharge sleeve
HTS: High temperature
STD: standard version, stainless steel
Ignition
DI: Direct Ignition (plugged pilot port)
PL: Pilot burner
Flame supervision
UVC: prepared for UV-scanner mounting
FRC: prepared for flame rod mounting
Fuels
INDITHERM® burners are designed to operate on natural gas. For propane and butane operation a standard INDITHERM®
burner can not be used. Contact MAXON when the use of gases other than natural gas is inevitable.
Burner discharge sleeve
The burner discharge sleeve is available in different materials and geometries:
Standard version with circular stainless steel discharge sleeve and square burner mounting plate.
High temperature version with refractory block for installation in applications where high temperatures can be expected.
In following cases the use of high temperature version discharge sleeve is required:
Dimension A is larger than 50mm
Insufficient low temperature process air is available to cool the discharge sleeve
No process air is available ( typical in indirect fired applications)
Process air is entered downstream of the burner, being unable to flow over the burner discharge sleeve
www.maxoncorp.com
combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
Low temperature burners - INDITHERM
®
1-2.3-10
E-m-7/08
Control motor mounting plate
The INDITHERM® burner can be equipped with an electrical or pneumatic control motor for capacity control. A broad range of
mounting plates are available to accept almost any common control motor on the market. Required torque = 1.2 Nm.
Maximum capacities
INDITHERM® burners will have different maximum capacities depending on burner size and application back pressure.
Refer to table on page 1-2.3-6 for maximum capacities.
Capacities are stated for firing at zero back pressure and for 1.5 mbar back pressure, both at 3 % O
level in the exhaust gases.
2
Minimum capacities
The minimum capacities depend on burner size and can be found in the table at page 1-2.3-6. The capacities in this table are those
that still allow a stable flame on main gas. When lower capacities are required, using a continuous pilot can be a solution. In this
case, the internal gas control valve of the burner can be closed even more at minimum position, while the minimum required gas
flow to maintain a stable flame can be adjusted using a needle valve on the pilot gas.
Preheated air
The INDITHERM® burner is designed to operate with non preheated combustion air. Although, the burner materials are suitable to
withstand up to 200° C temperatures, the burner will not perform according to the specifications page page 1-2.3-6 when the
combustion air is preheated. Contact MAXON for more details.
Process temperature
The high temperature refractory block permits operation of combustion chamber temperatures up to 950 °C . When using a
standard discharge sleeve, proper circulation of cold process air around the entire discharge sleeve should be present at all times.
Piloting and ignition
INDITHERM® burners have an internal pilot burner. Piloting is accomplished by internally bypassing the built-in gas butterfly valve
which is in the minimum position at low fire. The pilot gas is admitted to the gas nozzle via the main gas conduit and is injected
through the same gas nozzle ports as the main gas. The pilot gas adjusting valve allows for easy and precise adjusting of the pilot
flame.
The use of an intermittent pilot is technically possible on this burner and could result in lower minimum capacities.
Use minimally 5000 V/200 VA ignition transformers for sparking of the spark ignitor . Locate pilot gas valves as close as possible
to the pilot burner gas inlet, to have fast ignition of the pilot burner. When igniting the main gas, the capacity rating of the burner at
that point shall be limited.
Direct ignition
In case the use of a pilot burner is not required, the INDITHERM® burner can be direct ignited on main gas.
The pilot gas inlet should be plugged. When direct igniting an INDITHERM
limited. Direct ignition at high capacity is not allowed.
®
burner, the capacity setting during ignition should be
Typical ignition sequences
Pre purge of burner and installation, according to the applicable codes and the installation’s requirements.
Burner capacity control valve shall be in the start position to allow minimum combustion air flow to the burner.
Pre-ignition (typically 2 s sparking in air).
Open pilot gas and continue to spark the igniter (typically 5 s).
Stop sparking, continue to power the pilot gas valves and start flame check.
Check pilot flame stability (typical 5 s to prove the stable pilot).
Open main gas valves and allow enough time to have main gas in the burner. (typical 5 s + time required to have main gas in
the burner).
Close the pilot gas valves.
Release to modulation (allow modulation of the burner).
Above sequences shall be completed to include all required safety checks during the start-up of the burner (process & burner
safeties).
www.maxoncorp.com
combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
Low temperature burners - INDITHERM
®
1-2.3-11
E-m-7/08
Flame supervision
Flame supervision can be accomplished by use of a UV-scanner for all INDITHERM® burners and sizes. The scanner connection
is 1”. Due to the presence of gas at the scanner port, only tight scanners can be used.
The use of a flame rod is only possible in a limited range of applications where the standard discharge sleeve is used. A flame rod
combined with a high temperature discharge sleeve would generate a flame signal too low for proper flame scanning.
Contact MAXON for more details when considering a flame rod.
Flame development
INDITHERM® burners shall be installed in combustion chambers that allow full development of the burner flame.
Consult MAXON for proper combustion chamber lay-out.
Gas pipe train design
The INDITHERM® burner is very sensitive to variations in gas pressures at burner gas inlet. The burner gas inlet pressure should
not vary more then 2.5 mbar between high and low capacity.
Process back pressures
The INDITHERM® burner can operate between 0 and 1.5 mbar back pressure. The burner should not be used on applications
where back pressures would fall outside these limits. It is possible to mount the burner on a process with changing back pressures
as long as the fluctuating pressures stay within the 0 to 1.5 mbar limit.
Measuring equipment for burner commissioning
The burner gas pressures and air pressures as mentioned in table on page 1-2.3-6 should be used as a guideline for burner
system design and to have an approximative value for burner set up.T o adjust the burner properly during commissioning, the
oxygen content in the flue gas should be measured. A properly adjusted burner in an indirect fired application should have
approximately 3% O
in the stack at maximum capacity .
2
www.maxoncorp.com
combustion systems for industry
MAXON reserves the right to alter specifications and dat a without prior notice.
© 2008 Copyright Maxon Corporation. All rights reserved.
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