Burner Glossary / Terminology

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What is Combustion?

Combustion is a chemical process in which fuel reacts rapidly with oxygen and gives off heat. The fuel can be solid, liquid or gas. The fuel for Burnertech burners is always gas.

What is Metal Fibre?

In general term, Metal fibres are fibres which are produced from metals.
Our metal fibre mat is made from layered FeCrAlM alloys sintered in ovens at elevated temperature of 1300 oC. Our range of metal fibre have a variety of properties including porosity, air permeability and tensile strength made to suit specific applications. We have more than 10 different type of metal fibre sheets. Click here to see more detail about our metal fibre.

Why Choose Burnertech Metal Fibre Burner?

Burnertech special application group of metal fibres are sintered with distribution sheet of high temperature steel base (foil). The metal covering the steel base ensures good thermal protection to the burners, this helps to prevent thermal deformation of the burner thus improving the flame distribution, reliability and considerably prolonging the lifetime of the burner. The foil is also perforated in various formats thus incorporating its own distribution sheet.

What are infrared burners?

They are usually designed with stainless steel body or emission ceramic plates. The heat from the combustion is converted into infrared energy by the stainless-steel body or the ceramic plates. Burnertech uses special metal fibres, with an undulating surface which creates a far superior infrared efficiency along with giving increased durability compared to the fragile ceramic plaques normally used.

What is Low NOx?

The average emission factor for an uncontrolled combustion is between 80 - 120 ppm; for a low-NOx combustion, it is around 40 ppm [1].

What is Ultra low NOx?

The emission factor for a low-NOx combustion is around 40 ppm; for Ultra low-NOx combustion, it is less than 15 ppm.

Burnertech Low NOx range

Our Inverterjet burner typically has a NOx rating of around 10 ppm while maintaining good CO and CO2 emission level. Our Cylindrical burners can also achieve less than 10 ppm with slightly higher O2 levels.

What is Thermal NOx?

Thermal NOx refers to NO and/or NO2 that are produced during a combustion process. Nitrogen and Oxygen combines to form NOx in significant amount when the combustion temperature reaches 1600 OC

How can Thermal NOx be reduced?

In combustion application, Thermal NOx can be reduced with either post-combustion technology or pre-combustion technology. Post combustion technology also known as catalytic reduction breaks down the NOx formed in the exhaust gases. Pre-combustion technology prevents the NOx formation by either staging the combustion process or recirculate the flue gas into the combustion process (FGR).

What is FGR?

FGR means flue gas recirculation. It is the process by which flue gas formed in a combustion process is recirculated into the combustion-air stream prior to a burner.

What is EGR?

EGR means exhaust gas recirculation. It is the same as FGR

What is IFGR?

IFGR means Induced flue gas recirculation. IFGR technology utilises the combustion air fan to pull induced flue gas from the exhaust duct and send it back to the combustion air stream prior to the combustion air fan inlet. The combustion air fan also serves as the mixer. There is no separate FGR fan needed in an IFGR system.

What is Internal FGR?

This is when the flue gas from the combustion process is recirculated back into the flame. This approach reduces volume through the fan and, thus, lowers horsepower requirements. Additionally, it can increase overall efficiency.

What is Fuel Bound NOx?

Fuel bound NOx arises from the reaction of the originally bound nitrogen in the fuel with oxygen. Fuel-bound NOx can be reduced by post-combustion processes. The fuel-bound nitrogen in natural gas is low and considered insignificant.

What are fully pre-mixed burners and why is it beneficial?

Fully premixed burners have the fuel and air mixed upstream by a mechanical mixer, inspirator mixer or aspirator mixer before entering the combustion chamber (burner head) to be ignited. The burner head serves mainly as a flame holder, maintaining the flame in the desired location.

What are Atmospheric Burners?

An atmospheric burner uses the natural process of gas escaping from a gas inlet to mix with primary air. The primary air needed for combustion in atmospheric burners is provided from the atmosphere, without the need for a mechanical mixer.

What is Inward Firing Burner?

An inward firing burner refers to range of burners in which combustion takes place in an almost secluded combustion chamber and the flame from the combustion is directed through an opening. Burnertech inward firing multi zone system can modulate its output and have two or more independent gas/air supplies firing via multiple zones in the same burner cylinder or burner head compartment. Independent control of one or more of gas/air supplies to the multiple zones yields a comparatively large modulation range.

What is Ecovapor?

Ecovapor is a project sponsored by the European commission. The objective of the project is to create an innovative steam generating system that can be adapted to the real need of the end user by optimising power consumption in their facilities while meeting NOx emission requirements, all at the most cost-effective option in the market.  Burnertech is playing a crucial role in the Ecovapor project in that we are responsible for supplying the project with our innovative Inverterjet burner heads. Click here to see more of the Ecovapor project


1) EPA. (1995). Compilation of air pollutant emission factors, volume i: Stationary point and area sources. Research Triangle Park, NC: U.S. Environmental Protection Agency.