Institute for Energy Process Engineering and Fuel Technology > Equipment > Gas-fired furnace for MILD (flameless) combustion

Gas-fired furnace for MILD (flameless) combustion

Contact person:Dr.-Ing. Marco Mancini


Most of the energy consumed by basic industries, such as those producing steel, glass, cement, etc. is alloted to high-temperature processes. Therefore, the energy optimization of such processes, with the same or improved product quality, are of a particular importance economically. Such optimization is often realized by upgrading to new, highly-efficient burner technologies. To minimize financial risks associated with the conversion of a production plant based on a new combustion process, it is often useful to test its influence on important product quality parameters in advance. In the Spring of 2007, the IEVB erected a new experimental furnace. This furnace is equipped with a pair of regenerative burners (400 kW thermal input). The furnace has a large number of openings for measurements as well as a water-cooled heat sink allowing continuous operation.

Increasing the efficiency of thermal process plants based on combustion requires, as a rule, the recovery of the energy contained in the hot exhaust. The exhaust gas energy is used, in most cases, to preheat the combustion air. In recent years, a technology with much potential in this regard has been developed; it is known as MILD combustion (Moderate or Intense Low oxygen Dilution). Converting a plant to a MILD-burner system offers a variety of options and a multitude of advantages:

  • Reduction of product-specic fuel consumption
  • Reduction of nitrogen oxide emissions
  • Homogeneous temperature prole in the focal zone
  • Reduced noise emissions

There exists the possibility of conducting a variety of experiments using the MILD-experimental furnace. The IEVB has a wide range of measuring instruments available for determining combustion and heat transfer parameters.


Figure 3.4.1: Schematic of a gas red furnace using MILD combustion


Figure 3.4.2: MILD combustion at IEVB

Technical Data


Burner2 NFK/HRS-burner in regenerator-duty
Thermal capacityJe 400kW
Air preheating1300°C
Regenerator eciancy90%
Furnance temperatureMax. 1450°C


Cooling circuit

Characteristicmeandering cooling-snakes
water-/Glycol-plate heat exchanger
Glycol-/Luft-heat exchanger

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