If the fuel is too dry for the boiler, grate (stage 2)
and oxidation zone (stage 4) temperatures can be
Supplying the
boiler
Many physical system layouts are possible using
combinations of the fuel store and fuel extractor
systems described on pages 6–8. The fuel store
and boiler do not have to be on the same level,
nor do they have to be contiguous (although this is
preferable as long feed augers increase the risk of
blockages and jams, reducing reliability). Fuel is fed
by the fuel extractor mechanism to the boiler feed
mechanism via at least two physical safety devices
to prevent the fire in the boiler burning-back to the
fuel store.