| 摘要 |
The invention relates to a shaft furnace for the heat-induced foaming of particles of a bulk material, wherein the particles to be foamed pass into the furnace shaft (1) through the upper end face (6) thereof, flow through said shaft from the top to the bottom and are thereby heated and foamed, wherein the heating of the furnace shaft (1) is performed by heat sources (4) arranged outside and along the circumferential surface (2) of the furnace shaft (1) and wherein, in addition to the stream of particles to be foamed, gas also flows from top to bottom through the furnace shaft (1). In the upper part of the containment of the furnace shaft (1) there are separate feeds for the feeding in of the particles to be foamed of the bulk material and the flowing of gas into the upper part of the furnace shaft (1), wherein the openings for the feeding in of the particles to be foamed lie further away from the circumferential surface (2) of the furnace shaft (1) than the openings (8) for the feeding in of the gas.
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