Dunstan High School
Dunstan High School is a 560‐pupil secondary school serving a large rural catchment in and around Alexandra, Central Otago.
This resulted in the installation of a single, high‐efficiency 650kW Binder woodfuel boiler in place of the existing 1.4MW coal boiler.The project involved the removal of the old boiler, its fuel recovery system and a complete remodeling of the fuel store.
The boiler room was refurbished and extended to accommodate a 15,000 litre accumulator tank, an important component in wood‐fired installations which smoothes the load on the boiler and allows the system to meet peaks in demand without increasing the size of the boiler itself. The highly‐automated Binder boiler has a robust underfed grate system which allows it to burn wood fuels with a moisture content of up to 35%. Fully automated ignition, fuel feed, self‐cleaning boiler tubes and integration with the existing controls have revolutionised the heating system, freeing up the property manager from the unpleasant daily routine of de‐ashing and clinker removal.