Datasheet Content
GAS BURNERS MODULATING LOW NOx WITH FGR
GAS BURNERS MODULATING LOW NOX WITH FGR SK073014_C_en
GAS XP60 - P100 - P150/M-LX-FGR-EL
Burners for gas modulating (PID fully modulating) equipped with electronic control box LAMTEC BT3.
They are composed by: die-cast aluminum body, fan at high pressurisation and combustion head with adjustment at
high efficiency and high flame stability.
Compact overall dimensions and disposition rationalized of the components with accessibility facilitated for the
operations of setting and maintenance.
Gas train completely assembled and tested; complete of working valve with flow adjustment, safety valve, minimum
gas pressure switch and gas filter.
Complete of flange and gasket for installation on generator.
The actuators are independent and are managed directly by the electronic cam:
- one actuator for the gas modulator
- one actuator for the air shutter
- one actuator for the FGR shutter
The burners are equipped with an operating display that allows:
- Adjustment of the parameters of the burner operation
- Adjustment of the setpoint and operation range of the pressure / temperature probe
- Adjustment of the burner's curveset
With the addition of optional accessories (probes) thanks to the most advanced systems for automatic modulation in
mechanical or electronic version, the burner constantly ensures the proper gas / air ratio. The maximum efficiency of
the returns in each combustion point derived from the punctual adaptation of the thermal load to the heat
requirements of the burner at any instant of operation.
In the version with the electronic cam the fuel / combustion air curve, more extended, is fully exploited, guaranteeing
excellent performance in terms of accuracy and speed, even during the
calibration phase. A microprocessor monitors the different stages of the process and allows the correct repetition of
the sequences of operation.
Some accessories are available, like: PC interface, VSD (inverter), O2 control, O2+CO control, Profibus, Modbus.
Fig. 1 GAS P100/M-LX-FGR-EL
GAS XP60 - P100 - P150/M-LX-FGR-EL
GAS BURNERS MODULATING LOW NOX WITH FGR SK073014_C_en
CONTROL BOX LAMTEC BT3
Fig. 2 Control box Lamtec BT3
PRINCIPLE OF OPERATION BURNER WITH FGR
In these burners, to recirculate the exhaust gases from the flue it is used the combustion air fan.
N.B. THE ACTION OF THE FUEL AND AIR ACTUATORS IS NOT AFFECTED BY THE FLUE GAS RECIRCULATION.
The FGR damper stays closed at the beginning of the pre-purge period.
After the adjusted delay (parameter 414 of the BT3 - factory setting: 10) the pre-purge time is stopped temporarily
and the recirculation actuator runs to OPEN position. When the FGR actuator reach the pre-purge position (set to the
parameter 367), the pre-purge time resumes.
At the end of the pre-purge time the air damper and the FGR damper runs to the ignition position; the fuel actuator
is already in the ignition position.
When the BT3 reach the ignition positions of the actuators, the burner ignites.
When the BT3 change it operation in "MODULATION MODE", only the fuel and the air actuators run to the
programmed curve.
The FGR actuator remains at its position until the release conditions were met:
- Condition 1: The time period set in parameter 331 of the BT3 - factory setting: 200, it must be expired
and
- Condition 2: The release temperature of the flue gas set in parameter 332 of the BT3 - factory setting: 50, it must be
reached.
When the 2 conditions are met, the FGR actuator runs to the programmed curve.
You can see the spent time and the FGR temperature on the BT3 operating panel after the "MODULATION MODE".
If, during the operation of the burner, the FGR temperature drops below the threshold set in parameter 332, the
recirculation channel rmains active.
During the burner operation, the recirculation channel runs to the close position in one of these conditions:
- Condition 1: If the flue gas temperature drops below 0°C
or
- Condition 2: If the Pt100 temperature probe it fails or interrupts
N.B. IF ONE OF THESE TWO CONDITIONS HAPPENS, THE BURNER KEEP OPERATING WITHOUT THE FGR
RECIRCULATION CHANNEL. SO ONLY AIR AND FUEL ACTUATORS WORK THROUGH THE PROGRAMMED CURVE.
When you turn off the burner, the recirculation channel will be closed together with the fuel actuator.
GAS XP60 - P100 - P150/M-LX-FGR-EL
GAS BURNERS MODULATING LOW NOX WITH FGR SK073014_C_en
FGR (FLUE GAS RECIRCULATION)
FGR (flue gas recirculation) it is a technique for lowering NOx emissions from burners.
FGR lowers NOx in two ways:
1) The cooled, relatively inert, recirculated flue gases act as a heat sink, absorbing heat from the flame and lowering
peak flame temperatures.
2) When mixed with the combustion air, recirculated flue gases lower the average oxygen content of the air, starving
the NOx-forming reaction for one of the ingredients they need.
The percentage of the flue gas back to the combustion chamber it is defined by the opening of the FGR actuator
damper.
FGR quantity must be adjusted so as to recirculate the smallest quantity necessary to obtain the required Nox rate.
DISADVANTAGES OF THE FGR SYSTEM
LOSS OF THE BURNER CAPACITY
If you replace the combustion air with low oxygen flue gases, the burner has to be downrated to compensate for the
reduced weight of oxygen flowing through it.
You'll also suffer an additional capacity loss because the flue gas/combustion air mixture is at elevated temperature.
LOSS OF THE BURNER STABILITY AND FLEXIBILITY
The FGR system can be increase the emissions of he carbon monoxide and unburned hydrocarbons.
GAS XP60 - P100 - P150/M-LX-FGR-EL
GAS BURNERS MODULATING LOW NOX WITH FGR SK073014_C_en
TECHNICAL DATA AND OPERATING RANGE DIAGRAM GAS XP60/M-LX-FGR-EL
MODEL GAS XP60/M-LX-FGR-EL
Thermal power min. 1°st. / min. 2°st. - max. 2°st. * [Mcal/h] 130/200-474
Thermal power min. 1°st. / min. 2°st. - max. 2°st. * [kW] 151/232-551
Gas flow G20 (NATURAL GAS) min. 1°st. / min. 2°st. - max. 2°st. * [Nm³/h] 15.4/23.7-56
Fuel: NATURAL GAS (second family)
Fuel category: I2R,I2H,I2L,I2E,I2E+,I2Er,I2ELL,I2E(R)B
NOx ** [mg/kWh] <30
Intermittent operation (min.1 stop every 24h), modulating
Environmental conditions operation / storage: -15...+40°C / -20...+70°C, rel. humidity max. 80%
Max. temperature combustion air [°C] 60
Minimum pressure gas train D1"-S NATURAL GAS *** [mbar] 75
Maximum pressure at the entry of valves (Pe. max) [mbar] 360
Nominal electric power [W] 935
Fan motor [W] 740
Nominal fan motor current absorption [A] 2
Nominal auxiliary absorption [A] 0.5
Power supply: 3~400V, 1N~230V - 50Hz
Electric protection degree: IP 40
* Reference conditions: Environment temperature 20°C - Barometric pressure 1013 mbars - Altitude 0 metre (sea level).
** To obtain this low Nox emission like in the declaration, it's necessary to couple the burner to the proper boiler for this application: boilers with 3
turns for the exhaust gas, condensing boilers and any generator with direct exhaust outlet and the thermal load isn't higher then 1,8 MW/m³.
*** Minimal feeding-gas pressure to the gas train to get the maximum power of the burner, considering counter-pressure in combustion chamber
of value 0 (zero).
>PEDU@
Fig. 3 X = Thermal power Y = Pression in the combustion chamber
The firing rates has been obtained based on test boilers in accordance with EN267 standards and are indicative of matching the burner to the boiler.
For the correct operation of the burner, combustion chamber dimensions must be in accordance with current regulation. In case of non-compliance,
contact the manufacturer.
GAS XP60 - P100 - P150/M-LX-FGR-EL
GAS BURNERS MODULATING LOW NOX WITH FGR SK073014_C_en
TECHNICAL DATA AND OPERATING RANGE DIAGRAM GAS P100/M-LX-FGR-EL
MODEL GAS P100/M-LX-FGR-EL
Thermal power min. 1°st. / min. 2°st. - max. 2°st. * [Mcal/h] 133/400-774
Thermal power min. 1°st. / min. 2°st. - max. 2°st. * [kW] 155/465-900
Gas flow G20 (NATURAL GAS) min. 1°st. / min. 2°st. - max. 2°st. * [Nm³/h] 15.5/46.7-90.5
Fuel: NATURAL GAS (second family)
Fuel category: I2R,I2H,I2L,I2E,I2E+,I2Er,I2ELL,I2E(R)B
NOx ** [mg/kWh] <30
Continuous operation, modulating
Environmental conditions operation / storage: -15...+40°C / -20...+70°C, rel. humidity max. 80%
Max. temperature combustion air [°C] 60
Minimum pressure gas train D1"1/2-S NATURAL GAS *** [mbar] 34
Maximum pressure at the entry of valves (Pe. max) [mbar] 360
Nominal electric power [kW] 2.7
Fan motor [kW] 2.2
Nominal fan motor current absorption [A] 5.4
Nominal auxiliary absorption [A] 0.5
Power supply: 3~400V, 1N~230V - 50Hz
Electric protection degree: IP 40
* Reference conditions: Environment temperature 20°C - Barometric pressure 1013 mbars - Altitude 0 metre (sea level).
** To obtain this low Nox emission…
