The niff which is produced in Hydrolysis Feather Powder, Steam-tube Bundle Drier enters in dripping deodorization tower through tubes, then deodorize by means of spraying with spray pump, and cooling water which is to dissolve and absorb niff releases into sedimentation tank from the bottom of drainpipe; less residual gas is too late to be absorbed by water, so that flow to admitting port of draft fan following steam, with the function of centrifugal forth, it is transferred outside of room by means of supply air duct.

Structure Diagram: