Säbyverket

Säbyverket produces heat by firing bio fuel and wood powder. Wood powder is a by-product from forestry industry and the incineration of this product entails no additional input of carbon dioxide to the atmosphere.

The district heating plant Säbyverket, produces heat to the district heating network in Järfälla municipality. The plant has three boilers, which two of them are able to conbust bio fuel and wood powder, and together they are reaching the heating effect of 152 MW energy. Wood powder is the result of grounded wood pellets and is basically like firing wood. The difference to solid wood is that wood powder or pellets are three times as efficient. Pellets are manufactured from various by-products from forestry and wood processing industry, such as sawdust. The sawdust is dried and afterwards grounded in a mill, in order to receive a finer fraction. Later, the ground material is pressed at an extremely high pressure and high temperature in the matrix of wood pellets. Finally, the product is cooled down and delivered to the customer. Thereafter, the pellets are brought to a mill, where four parallel lines ground the pellets to powder, which is dosed and blown by air pressure to the burner of the boiler. The carbon dioxide, emitted during the combustion of wood powder entails no additional input of carbon to the atmosphere. Because, it was taken up by the tree during its growth and is therefore part of the natural carbon cycle.