DRYING PLANT Russian patent published in 1999 - IPC

FIELD: mechanical engineering. SUBSTANCE: this drying plant is used for thermo-moisture treatment of materials. Drying plant has cylindrical hermetic housing 1 with thermal insulation 2, drying chamber 3 which is created by internal screen 4. Screen 4 is located in housing 1 with creation of duct 5 for drying agent. One of side walls of screen 4 is made in the form of distributing grate which is formed by guide blades 6. Bottom part of housing 1 has no thermal insulation and is used as condenser 7. Made in other side wall of screen 4 which is located oppositely to distributing grate is suction hole 8 of centrifugal fan 9. Located in upper narrowing part of drying agent duct 5 of distributing grate is air heater 10. Water-circular vacuum pump 11 by means of condensate drain pipeline 12 combined with external air inlet is connected to bottom part 7 of housing 1. Pipeline 12 is provided with shut-off fitting 13. Located in zone of connecting pipeline 12 is recuperative heat exchanger 14. Made in upper part of housing 1 between fan 9 and air heater 10 is exhaust hole 15 with exhaust pipe union 16 connected to it. Pipe union is provided with adjustable shutter 17. Drying plant is provided with steam generator 18 installed in drying agent duct 5 between fan 9 and distributing grate. Material to be treated 19 is introduced into drying plant on draw in/out carriage 20. Aforesaid embodiment of drying plant allows for performing convection drying at atmospheric pressure, also cyclic processes of convection drying, vacuum convection drying, and conditioning of material being treated. EFFECT: higher efficiency. 5 cl, 1 dwg