Apparatus and method for separating condensable materials from an exhaust air stream

A roll stand (300) for rolling of metallic rolled stock;

• characterized by an apparatus (100) for separating condensable materials from an exhaust air stream (B), comprised of the following:
• a flow duct (110) which can convey the exhaust air stream (B) bearing said condensable materials, in a flow direction;
• a first separator (114) located in the flow duct;
• a fan (112) provided in the flow duct (110) upstream of the first separator (114) in the flow direction of the exhaust air stream;
• a scrubber (113) is disposed between the fan (112) and the first separator (114);
• characterized by
• a second separator (116) located in the flow duct downstream of the first separator (114) in the flow direction of the exhaust air stream;
• a cooling device (115) located between the first separator (114) and the second separator (116);
• an additional flow duck (120) for conveying an additional exhaust air stream bearing filterable materials;
• a further fan (122) located in the additional flow duct (120);
• a further scrubber (123) located in the additional flow duct downstream of the further fan in the flow direction;
• and
• a third separator (124) located in the additional flow duct downstream of the further scrubber (123) in the flow direction,
• wherein an exhaust hood (111) of the flow duct (110) is disposed above an exit, and an exhaust hood (121) of the additional flow duct (120) is disposed over an entrance, of the roll stand (300).

A roll train (400) comprised of a plurality of roll stands (300) for rolling of metallic rolled stock,

• characterized by
• an apparatus (100) for separating condensable materials from an exhaust air stream (B), comprised of the following:
• a flow duct (110) which can convey the exhaust air stream (B) bearing said condensable materials, in a flow direction;
• a first separator (114) located in the flow duct;
• a fan (112) provided in the flow duct (110) upstream of the first separator (114) in the flow direction of the exhaust air stream;
• a scrubber (113) is disposed between the fan (112) and the first separator (114);
• characterized by
• a second separator (116) located in the flow duct downstream of the first separator (114) in the flow direction of the exhaust air stream;
• a cooling device (115) located between the first separator (114) and the second separator (116);
• an additional flow duck (120) for conveying an additional exhaust air stream bearing filterable materials;
• a further fan (122) located in the additional flow duct (120);
• a further scrubber (123) located in the additional flow duct downstream of the further fan in the flow direction;
• and
• a third separator (124) located in the additional flow duct downstream of the further scrubber (123) in the flow direction,
• wherein:
• an exhaust hood (111) of the flow duct (110) is disposed between at least two of the roll stands (300), for drawing in the exhaust air which has an elevated concentration of condensable materials at that location, into the flow duct (110);
• and
• a second exhaust hood (121, 121′) is disposed at the entrance of the first roll stand (300), and preferably also at the exit of the roll train, for drawing in the exhaust air which has an elevated concentration of filterable materials at that location, into the additional flow duct (120).

A method of separating condensable materials from an exhaust air stream, comprised of the following steps:

• providing a flow duct (110) for conveying the exhaust air stream (B) bearing the condensable material, in a flow direction;
• locating, in the flow duct (110), a fan (112) for drawing in the exhaust air stream with the condensable materials, at least near its point of origin;
• arranging, in the flow duct (110), downstream of the fan (114), a scrubber (113) for scrubbing to remove filterable materials oil droplets and fine aerosols, from the exhaust air stream;
• and
• arranging, in the flow duct (110), downstream of the scrubber (113), a first separator (114) for separating out entrained droplets from the scrubbed exhaust air stream;
• characterized by the following steps:
• providing, in the flow duct (110), downstream of the first separator (114), a cooling device (115) for cooling remaining exhaust stream to condense out the condensable materials present;
• arranging, in the flow duct (110), downstream of the cooling device (115), a second separator (116) for separating out the condensable materials;
• providing an additional flow duct (120) for conveying additional exhaust air stream bearing filterable materials;
• locating, in the additional flow duct (120), a further fan (122) for drawing in the additional exhaust air stream having filterable materials, at least near its point of origin;
• providing a further scrubber (123) in the additional flow duct (120), downstream of the further fan (123) for scrubbing to remove filterable materials, especially oil droplets, from the additional exhaust air stream;
• and
• locating, in the additional flow duct (120), downstream of the further scrubber (123), a third separator (124) for separating out entrained droplets from the scrubbed additional exhaust air stream.