Laminar flow cooling lower header with blowdown function

The utility model belongs to the technical field of pipelines, and particularly relates to a laminar cooling lower header with a pollution discharge function, which comprises a straight pipe, a plurality of water nozzles axially distributed on the straight pipe, a movable end cover arranged at the tail end of the straight pipe, a pollution discharge branch arranged on the straight pipe at the movable end cover, and a valve arranged on the pollution discharge branch. A cleaning rod is arranged in the straight pipe between the last water nozzle on the straight pipe and the movable end cover, a cleaning brush and a scraper are arranged on the two sides, close to the inner wall of the straight pipe, of the cleaning rod respectively and abut against the inner wall of the straight pipe, and a driving piece for driving the cleaning rod to rotate is arranged on the movable end cover. The device can realize on-line cleaning of the blockage problem of the lower collecting pipe, and effectively solves the problem of non