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.
High-performance heat for large-scale applications
The HDG M300-400 is designed for applications with high heat demand and combines combustion and control technologies with practical convenience features. The result is a high-performance wood heating system for a wide range of applications. Depending on operating conditions and fuel quality, efficiency levels of up to 94% can be achieved.
This makes the HDG M300-400 suitable for a wide range of applications, including use in municipal heating networks where biomass-based heat generation forms part of the overall energy concept.
Combustion chamber temperature sensor
The combustion chamber temperature sensor provides key information for controlling fuel feed, ignition and the primary air supply. The primary air is used for pre-drying and outgassing of the fuel and supports the combustion process.
Lambda sensor
The lambda sensor measures the residual oxygen content after combustion and provides control values for the secondary and tertiary air supply. These air streams are introduced into the combustion gases at different stages of the combustion process and support efficient combustion.
Flue gas fan with negative pressure control
The speed-controlled flue gas fan is regulated via a negative pressure control system and maintains a defined negative pressure level in the combustion chamber. This helps compensate for variations in fuel properties and changing flue conditions.
High efficiency and low emissions
The geometry of the combustion chamber was developed in cooperation with the Fraunhofer Institute. A key element is the integrated centrifugal separator with downstream slowdown and pressure-relief zone. Due to the 180° deflection, dust particles can already be separated within the combustion chamber. In addition, the combustion control system operates from the start-up phase and supports low-smoke combustion.
Forced-flow heat exchanger
The layered flow design of the heat exchanger supports efficient heat transfer and contributes to high efficiency. All heat exchanger surfaces are cleaned automatically, helping to reduce maintenance requirements.
Clean and quiet operation
In normal operation, the HDG M150-240 is designed for low-noise operation. The integrated central ash removal system, including the lower grate ash removal system for combustion ash, together with the automatic cleaning of the heat exchanger surfaces, helps reduce manual cleaning and maintenance effort. In addition, a range of ash removal systems is available to suit different application requirements.
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.