Patent ID: 7077888

Claim:
A filter device for separating dust from flue gases in combustion plants, comprising: a dust filter positioned along the flue gas path, the dust filter comprising: a multi-surface casing, a first grid formed on or within the casing having a substantially rectangular cross-section and a surface, a second grid formed on or within the casing having a substantially rectangular cross-section and a surface, the surface of the first grid arranged substantially parallel to the surface of the second grid, at least one bulk material filter arranged between the substantially parallel surfaces, wherein when the flue gas flows through the bulk material filter, heat from the flue gas is absorbed by the bulk material filter, and wherein when combustion air from the combustion plant flows through the bulk material filter, the bulk material filter heat is released to the combustion air, in which the bulk material filter has a bulk material dedusting device, the dedusting device adapted to separate the dust from the bulk material, wherein the bulk material dedusting device has a lower collecting tank arranged in the flue gas flow direction downstream of a first material lock of the bulk material dedusting device, from which tank the bulk material dust mixture can be routed by a conveying airflow to a cyclone separator in which the bulk material and the dust can be separated from each other.