Most effective forSub 10 ppm NOxand high efficiency

• S a f e , e f f i c i e n t a n d r e l i a b l e• P l u g & P l a y t e c h n o l o g y , p r e - w i r e d i n o u r w o r k s h o p• A d j u s t a b l e f l a m e d i m e n s i o n s t o p r e v e n t p r e m a t u r e c o m b u s t i o n c h a m b e r d a m a g e s• E x c e l l e n t U l t r a L o w N O x e m i s s i o n a n d h i g h t h e r m a l o p e r a t i o n e f f i c i e n c y

UNNOx

Best proven technique that overcomes the l imits of Ultra Low NOx gas combustion from 4 up to 21 MW/h

Ultra low NOx gas burner

FRELSER CLEAN COMBUSTION EXPERTS

FRELSER is connected to the advancement of technology and always provides solutions to meetincreasingly stringent emissions standards requirement within state of the art and efficient equipment.

F R E L S E R O V E R C O M I N G L I M I T S

Decades of dedication and improvement usingFRELSER’s LowNOx technology for emissionreduction within proven results in many realinstallations provided over the years. We havecertainly contributed on development of proven lowemission technology. Everyday tons of pollutinggases are no longer released into the atmosphereby our satisfied customers.

FRELSER and its advanced engineering team have developed FRELSER UNNOx, a pioneering new generation of ultralow NOx gas burner, utilizing FRELSER IGR Hollow Flame internal gas recirculation technology, which performs auniform and low flame temperature that ensures also low CO emissions and high combustion efficiency.

Our first low NOx installations date back to the 1990s. FRELSER burners in a petrochemical industry

2000 2008 2015 2020

60

30

200

UNNOx 50

LPGNG

FRELSER UNNOx

DESCRIPTION OF THE UNNOX TECHNOLOGY

The 50 Series is the standard burner that covers current emission limit requirements for most of thecountries, generally less than 50 ppm NOx emission (@3% O2 dry) is obtained without any externalrecirculation, zero FGR.

Use UNNOx Series 30 for narrower boundaries and eliminate uncertainties related to furnacegeometry, and other details. The 30 Series has external flue gas recirculation so that emissionsbelow 30 ppm can be guaranteed.

Utilizing ultra low NOx Frelser UNNOx Series 10 ends, it allows a recirculation of 20% FGR or morewithout instability, allowing the desired index to be effectively achieved.

The UNNOx® FRELSER burner is a proven way to minimize the amount of thermal nitrogen oxide present at combustion process.

FRELSER UNNOx technology is a proven system for applying natural gas combustion for the efficient generation of clean energy, heat and steam in the industrial sector.

Pioneer on development of its own technology of the IGR-HF FRELSER technology.

FGR External flue gas recirculation byexternal duct.IGR-HF Technology based on twoprinciples Internal gas recirculation byaerodynamic effect on the burner nozzleFRELSER UNNOx eliminates the pointwhere thermal NOx is most produced, usingthe flame core.(*) IGR-HF technology has no flame core,This we call hollow flame.

NOx values for FRELSER UNNOX burner in firedtube boilers.

100

90

80

70

60

50

40

30

20

10

NOx  pp

m

UNNOx-30

UNNOx-10

FRELSER UNNOx overview

Mark Description Status1 Flame Tube Standard2 Spud Low NOx FRELSER Standard3 FRELSER UNNOx Burner Standard4 Air Control Drive Optional5 Air Flow Control Damper Optional6 Silencer Optional7 Ignition Standard8 Flame Scanner Standard9 Adjustable Lower Frame Standard

10 Spark Trafo Standard11 FGR Control Damper Optional12 Combustion Fan Standard

*to be conf i rmed and attuned to you r project, furnace temperature and geometry

FRELSER UNNOx  BURNER  MAIN  FEATURES

Installation Indoor (O p t i o na l o u t d oo r )Turn Down 1 to 10Max NG pressure (PS) 500 mbarAmbient temperature -10 ≤ T (C°) + 40NOx emissions (with further FGR)* < 10 ppm @3% O2 dry (18mg/Nm3 @3% O2 dry)CO emissions (with FGR) < 100 ppm @ 3% O2 dry (15mg/Nm3 @3% O2 dry)Excess Air ≤ 15%Max FGR temperature (Combustion Air Ambient) 220°CCombustion Air Operating Temperature - 10 ≤ T (°C) < 6 0 ( O p t i o n a l < 4 0 0°C)

THE BEST PERFORMANCE AT YOUR SERVICE

PRE SELECTION CURVE UNNOx

0

40

80

120

160

200

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000 24000PRE

SSÃO

 NA FO

RNAL

HA  (MMCA

)

POTÊNCIA DO QUEIMADOR KW/H 

B2‐50

C‐50

C2‐50

E‐50

E2‐50

F‐50

F2‐50

G‐50

G2‐50

IHM‐ 10”Touch screen

Smartphone

4‐20

 mA

Flame Sensor 

Inverter

Air C

omb.

Gas

Second

gas

Biog

as

Extra

FGR

CAN‐BusExtra

Extra

Extra

Extra

Internet (IP)

KeypadView

Control

O2 Sensor

Sensor control

ScadaComputer

Modbus RTUProfibus DP

4‐20 mA

Fully manufactured in England, the FRELSER Burner Management System offers numerous features:

• Suitable for single and dual fuel burners (multiple burners as well)• All burner start up sequence functions and timings fully integrated• UV scanner , UV Auto‐checking scanner and ionisation flame rod support available• Control of variable speed drives for combustion air• Up to 10 rotary actuators can be assigned allowing complex applications to be addressed• Fuel safety valve control and proving• Up to 4 air / fuel ratio profiles can be programmed• Choice of communications protocols including RS‐485, Profibus and Modbus•Versatile programming options allowing most applications to be addressed•Oxygen trim option using dedicated FRELSER oxygen probe and interface

Benefits• Improved combustion and improved turndown saving 

up to 5% on fuel costs and significantly reduction on harmful CO2 and other pollutants emissions

• Rotary actuators with a positioning accuracy of ±0.1°eliminates backlash and hysteresis

• Passcode protection to prevent untrained / unauthorized changes to combustion set‐up

• Software allows advanced interfacing functions and collection / trend logging of data

• Oxygen trim saves up to 3.5% on fuel costs 

FRELSER UNNOx control architecture overview

MAIN SCOPE AND OPTIONS

ControlModulating through the electronic controllerthe capacity is intelligently adjusted and scaledto heat demand.

Minimum charge

On Off

Total charge

Ignition charge

© FRE

LSER

 27/11

/201

9

Praça Takashi Nagashima, 1000. Varginha ‐ MG BrazilTelephone: +55 35 3015‐4195

www.frelser.com 

We are theClear Combustion Experts

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