How does the Vølund air-cooled grate work?
The grate is a modular design consisting of fixed and movable grate girders which, in a longitudinal and lifting movement, simultaneously transport the waste forward and level and rearrange it so that combustion and burn-out of all waste components is carried out with the correct injection of combustion air. Any holes which arise in the waste layer, where burn-out is faster, are filled again through the levelling movement.
Low pressure loss and a consistent distribution of combustion air
The even distribution of the layer of waste makes it possible for the Vølund air-cooled step grate to operate with a relatively low pressure loss when combustion air flows through the grate, while still obtaining an even, sufficient and constant distribution of combustion air over the zones of the grate surface. The longitudinal and lifting movements agitate the waste and ensure that fresh and unburnt materials are continuously exposed to combustion air and heat.
The low pressure drop results in less energy consumption for the primary air fan. Moreover low pressure drop results in fewer particles leaving the burning fuel bed cold and thereby minimising the dioxin emission from the boiler.
