device and method for drying and roasting at least one stream of carbon-containing material in a multi-hearth furnace

摘要

A device and method for drying and roasting at least one stream of carbon-containing material in a multi-hearth furnace. A device according to the invention for drying and roasting at least one stream of carbon-containing material in a multi-hearth furnace is substantially comprised of a drying zone comprising a feeding device for feeding a stream of carbon-containing material. a discharge point for discharging a water vapor containing drying gas stream and a feed point for recycling at least one portion of drying gas stream, a roasting zone for degassing the flow of dry material in the drying zone, comprising a discharge point a stream of roast material, at least one feed point for an exhaust gas and a discharge point for a roasting gas flow, a heat exchanger for heating the drying gas flow, unloading point of the drying zone being connected by heat exchanger to the feeding point of the drying zone, a co The roasting zone discharge point is connected via the combustion assembly and the heat exchanger to the roasting zone feed point, wherein a flow of roasting gas is discharged through the discharge point. The roasting zone is burned in the combustion assembly and the resulting exhaust gas is used in the heat exchanger to heat the drying gas flow and is fed into the roasting zone, where the drying zone and the roasting zone comprise two separate gas circulations.