Modulating combustion technology

Modulating combustion technology

  • Modulation range 3:1
  • Volumetric oil dosing
  • Electronic fuel/air ratio control system
  • Unsusceptible to gas inclusions in the oil feed
  • Intuitive control and operation system via display
  • Engine pump unit with integrated electronic drive control
  • Low electric power consumption
  • Ideal for condensing boilers

The modulating combustion technology is our answer on the requirements of heating systems in modern and well-insulated buildings where there is increased power demand for the heating of drinking water compared to the heating load. The request of controlling the firing capacity cannot be inevitably derived from this discrepancy because in many cases, storage units are used for the heating of drinking water thus decoupling the chronological sequence of tapping from the heat supply of the burner. The integration of a solar-thermal system using a hot water buffer storage also decouples the firing capacity from the current heating load. However, these storage solutions require space and are very cost-intensive. If you want to reduce the size of your storage unit, you should use a firing system which is in the position of charging the storage unit within a reasonable time. On the other hand, it must be possible to reduce the power enough such that the capacity of the storage unit is available for regenerative energy sources as far as possible. The modulating blue flame burner HLM 35 deals with these load requirements in an intelligent way: it delivers exactly the energy amount requested by the control of the heating device which is necessary in consideration of the free storage capacity and the regenerative supply to be expected. Thus, only the amount of energy is covered by heating fuel which cannot be covered by regenerative energies. This additional heating threshold can be further decreased by the high modulation range of the burner. Because if the regenerative share is lower than expected, the blue flame burner HLM 35 heats up the system to its required temperature within a short period due to its power reserves. 

In addition to the fuel saved by the intensive use of regenerative energy sources, state-of-the-art combustion condensing boilers allow for further savings in part load operation. With the heat exchanger area having the same size and the firing capacity decreasing, the exhaust gas temperature decreases thus increasing the condensate eliminating degree and the utilisation of heating value. The resulting additional energy causes further efficiency increase which in turn again decreases the fuel requirement.

Considerable benefits with regard to emissions also arise from the modulation of the firing capacity. On the one hand, it is possible to start the burner at the ideal load point thus causing only minimal starting emissions. On the other hand, the starting frequency is reduced by the controllability of the firing capacity. Compared to standard solutions, the high pressures of the fan result in significant emission reductions during stationary operation. Using state-of-the-art drive technology for the oil pump and fan, the requirement of electric energy is about half of that of one-stage blue flame burners.