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ETA Heiztechnik GmbH
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  5. ETA - Model HACK VR 250 to 500 kW - ...

ETA - Model HACK VR 250 to 500 kW -Wood Chip Boiler

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In times of rising raw material costs, it is a real challenge to heat larger properties – not, however, if you rely on a crisis-proof and domestic fuel, such as wood chips. Wood chips are produced from wood that is otherwise difficult to reuse, such as thinning materials, splinters of wood after storm damage and sawing residue from domestic wood processing plants. It is chopped in powerful chippers and according to predefined standards. The size of wood chips is standardised. Sizes from P16S - P31S are suitable for our systems.



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A system that can handle coarse chips too

Every ETA wood chip conveyor system is well thought out, tried, tested and designed for the toughest use: the transport of coarse, uneven wood chips. So that pieces of wood of up to 12 cm can be transported, all parts must work together perfectly. That starts already in the bunker. The wood chips reach the screw via generously designed open troughs. In the process, a relief plate prevents the material from exerting too much pressure on the discharge screw and thus enables fill heights of up to five metres. Bottlenecks are avoided in the enclosed trough channel thanks to the spacious discharge connections. A smooth material transport is supported by the progressive screw, which additionally loosens the wood chips. Even the installation is easy thanks to the modular design. The screw modules with sizes of 25 to 200 cm are produced and aligned in automated machines, the specially shaped trough channels only have to be screwed together.

The right temperature in the combustion chamber
thanks to permanently regulated flue gas recirculation: to achieve optimum results in terms of emissions and efficiency during combustion, you need a steady, ideal temperature in the combustion chamber and therefore permanent control of the flue gas recirculation. As in the draught fan, a highly efficient fan is used here too to keep the combustion temperature in the de-gassing zones above 800 °C, but under 1,000 °C at all times. In this temperature window, all components of the fuel are completely split for one. And on the other hand the thermal load on the components is kept as low as possible, which enormously increases the lifetime of the boiler. Combustion temperatures that are too high can also lead to undesirable slag formation.

Whether for the burning of wood chips or pellets:
the interior of this moving grate boiler has all that is needed for safe, clean and flexible heating. Flue gas recirculation is permanently monitored. It reinforces the flow of gas. The grate is cooled better and the temperatures in the boiler remain stable in one area, which on the one hand ensures complete combustion of the corresponding fuel and on the other counteracts slag formation. Underpressure monitoring ensures safety, while the lambda control ensures the highest efficiency with the lowest emissions. Maximum convenience is ensured with an absolutely reliable system for the fuel feed and the multi-cyclone dust separator.