HDG M300-400 (Wood Chip)
Proven technologies and clever innovations make the HDG M300-400 a "power cube".
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Inside view of the boiler
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1 - PLC control2 - Lambda sensor3 - Special combustion chamber4 - Innovative stepping grate5 - Automatic cleaning system6 - Automatic ash removal7 - Primary and secondary air8 - Overfill protection9 - Relaxation zone10 - Combustion chamber temperature sensor11 - Walk-in access -
Technical data
M300
M350
M400
Nominal thermal power (kW) 300 350 (375 in pellet mode) 400 Minimum thermal power (kW) 90 105 (112.5 in pellet mode) 120 Flue gas temperature at nominal thermal power (°C) 150 160 170 Flue gas mass flow at nominal thermal power* (kg/s) 0.185 0.221/0.229 0.257/0.245 Water capacity (l) 3060 3060 3060 Maximum permissible operating pressure (bar) 3 3 3 Flue draught requirement (Pa) 10 10 10 Maximum flow temperature (°C) 95 95 95 Flue gas pipe connection (mm) 300 300 300 Dimensions and weight
M300
M350
M400
Height without attachments (mm) 2316 2316 2316 Width without attachments (mm) 2570 2570 2570 Depth without attachments (mm) 2012 2012 2012 Weight (kg) 5910 5950 5980 * In the case of two specifications, the first refers to wood chip operation, the second to pellet operation.
Climate-friendly heat on a grand scale
The HDG M300-400 is the ideal heating system where a high heat demand meets the most exacting requirements when it comes to efficiency and reliability. It combines proven technologies in combustion and control engineering with clever convenience functions to create a sophisticated wood heating system with great performance. An efficiency of up to 94 percent speaks for itself.
This makes the HDG M300-400 a "power cube" for a wide range of applications – also ideal for setting up carbon neutral municipal heating networks.
Combustion chamber temperature sensor
The combustion chamber temperature sensor provides the information for controlling the amount of material, ignition and, above all, the primary air supply. This is needed for pre-drying and outgassing of the fuel and provides the main air for combustion.
Lambda sensor
The lambda sensor measures the residual oxygen following combustion and therefore determines the values for the secondary and tertiary air. Both are admixed with the combustion gases at different times and therefore guarantee extremely clean combustion with the highest levels of efficiency.
Flue gas fan with negative pressure control
The speed-controlled flue gas fan is controlled by a negative pressure control and ensures a constant negative pressure in the combustion chamber. Fluctuating fuel properties and unfavourable flue conditions are therefore effectively compensated.
Maximum efficiency and low emissions
The geometry of the combustion chamber was developed together with the Fraunhofer Institute. The core of this is the integrated centrifugal separator with downstream slowdown and depressurising zone. Due to a 180° deflection, dust is already separated in the combustion chamber. Furthermore, the combustion control takes control right from the start phase and therefore guarantees almost smoke-free combustion.
Forced-flow heat exchanger
The layered flow of the heat exchanger optimises the heat transfer and guarantees maximum levels of efficiency. All heat exchanger surfaces are cleaned fully automatically, whereby the maintenance effort is reduced to a minimum.
Extremely clean and quiet
In normal operation, the combustion of the HDG M300-400 runs at low volume and, thanks to the integrated central ash removal system with the new and unique lower grate ash removal system for the removal of combustion ash as well as the fully automatic cleaning of all heat exchanger surface areas, the heating system virtually cleans itself. In addition, numerous ash removal systems are available for all requirement profiles.
Video of the HDG M300-400 with Vario feeding system
Find out how easy it is to heat with the HDG and experience our flexible wood chip boilers as used by our customers.
Absolute control
PLC combustion technology and system control with HDG Control
For control, we rely on the combination of PLC control and the new HDG Control:
PLC combustion technology
- Continuous determination of reference variables via combustion chamber temperature sensor and lambda sensor
- Constant adjustment of the optimum air and fuel quantity
- Capacity control according to strict specifications ("QM heating plants")
- Open for extensions (Mod-Bus, etc.)
HDG Control
- Integration of external heat sources, solar thermal systems, accumulators, heating circuits, mains pumps, domestic hot water preparation, etc.
- Control of cascade systems and local heating networks
- On request: Full web access and app for iOS and Android
From the warehouse to the boiler
Flexible delivery system and feeding technology for every area of application
A sophisticated delivery and feeding system is crucial for the safe and reliable operation of an automatic wood heating system. With clever innovations, the new HDG Vario system sets standards here.
- Cut-Connection: Huge transfer opening between the auger and the rotary feeder reliably prevents material blockages
- 4-chamber rotary feeder: Combines absolute back burn protection with minimum component stress due to low friction surfaces
- Stoker auger with dosing container: The fuel dosage via light barrier guarantees an even material supply and constant output even with different fill levels in the warehouse
In addition, with several delivery systems for wood chips (flexi blade delivery system, hinged arm delivery system, walking floor delivery system, etc.) and pellets (suction system, auger), solutions are also available for fuel transport for every application.
Out of the boiler – into the bin
The right ash removal solution for every area of application
Depending on the area of application, various ash containers can be used. We work together with you to plan an individual solution.
- 80 litre ash box: Ideal for pellet operation and in confined spaces
- 230 litre ash box with Euro interface: Ideal for agricultural enterprises. Can be transported using the front loader.
- 120 or 240 litre ash bin: Ideal if the ashes are disposed of by a disposal company.
- 400 litre dump body: Large volume for industrial use. Can be transported using the forklift truck.