COUNTERFLOW SPRAY DRYER Russian patent published in 2012 - IPC F26B3/12 

FIELD: power engineering.

SUBSTANCE: counterflow spray dryer comprises a cylindrical drying chamber with nozzles arranged on the upper level of the drying chamber, covering the lower level of the drying chamber from the outside, a gas duct in the form of a box with permanent cross section, separated into two compartments by a helical partition, the pitch of which is equal to the height of the box, a divider of a coolant flow arriving into the box into two flows sent into compartments into mutually opposite directions, gas-distribution grids at the coolant inlet into compartments, nozzles to supply coolant from compartments into a drying chamber arranged evenly on the upper and lower surfaces of the box. The helical partition comprises gas permeable parts that separate compartment sections that are initial and final along the coolant flow, every of which comprises at least one nozzle. Nozzles arranged on the upper surface of the box are displaced relative to the nozzles arranged on the lower surface of the box by half of the distance between neighbouring nozzles, and a part of the surface of the divider entering the box is perforated. Nozzles are arranged in plan at the angle of not more than 12° to conventional radii stretching in the drying chamber.

EFFECT: invention shall intensify drying process as a result of higher evenness of coolant distribution in a drying chamber and elimination of chamber walls overheating at coolant entry level.

3 cl, 4 dwg