Abstract

The invention relates to a microwave calcination furnace for solid materials divided into fine particles, comprising a heating chamber of elongate form, a longitudinal axis of which is arranged vertically, an intake tube (8) opening into the heating chamber at an upper end of said heating chamber, a discharge port opening into the heating chamber at a lower end of said heating chamber, a mixer (28) comprising at least one mixing shaft (30) which carries a plurality of mixing blades (32) and a system (34) for rotating the mixing shaft, and at least one waveguide (18) which is connected to a microwave generator (20) and which opens into the heating chamber between the upper and lower ends of said heating chamber via a protection window (22) mounted on the heating chamber with interposed wave-cancelling seals (26).

IPC Classes  ?

• C04B 2/12 - Preheating, burning, calcining or cooling in shaft or vertical furnaces
• F27B 1/00 - Shaft or like vertical or substantially vertical furnaces
• F27B 1/08 - Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge
• F27B 1/12 - Shells or casingsSupports therefor
• F27B 1/20 - Arrangement of devices for charging
• F27B 1/21 - Arrangement of devices for discharging
• F27B 9/06 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and chargeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity electrically heated
• F27B 19/02 - Combinations of different kinds of furnaces that are not all covered by any single one of main groups combined in one structure
• C04B 20/06 - Expanding clay, perlite, vermiculite or like granular materials
• F26B 3/347 - Electromagnetic heating, e.g. induction heating or heating using microwave energy
• F26B 11/16 - Machines or apparatus for drying solid materials or objects with movement which is non-progressive in stationary drums or other mainly-closed receptacles with moving stirring devices the stirring device moving in a vertical or steeply-inclined plane
• H05B 6/78 - Arrangements for continuous movement of material
• F27D 11/00 - Arrangement of elements for electric heating in or on furnaces
• F27D 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

The invention relates to a rotary microwave furnace (2) for the heat treatment of divided materials, comprising a rotary cylindrical heating body (4), two fixed cowls (14) mounted on each longitudinal end of the heating body with interposition of annular wave-trapping seals (16), at least one slotted waveguide (22) mounted inside the heating body and extending between each end thereof and connected at one end to a microwave generator (24a, 24b), a system (34) for supplying divided materials, a system (36) for removing the divided materials, means (42) for removing smoke and/or for injecting gas into the heating body, means (8, 10) for rotating the heating body, and means (12) for tilting the longitudinal axis of the heating body relative to the horizontal in such a way as to regulate the speed of advance of the divided materials admitted into the heating body.

IPC Classes  ?

• F27B 7/12 - Rotary-drum furnaces, i.e. horizontal or slightly inclined tiltable
• F27B 7/20 - Details, accessories or equipment specially adapted for rotary-drum furnaces
• F27B 7/34 - Arrangements of heating devices
• F27D 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

The invention relates to a microwave extraction oven (2) for the continuous heat treatment of solid organic products, comprising: - a belt conveyor (4) intended to transport the products (P) to be treated, the belt (6) of the conveyor being porous to extracts resulting from the treatment of the products; - a heating tunnel (8) through which the belt of the conveyor passes from one end to the other and comprising a microwave-impermeable enclosure (10) inside which at least one waveguide (12) opens, which waveguide is connected to a microwave generator (14); and - a tray (16) for receiving and condensing the extracts resulting from the treatment of the products after they have diffused through the belt. The heating tunnel comprises an entrance seal (20) positioned at the inlet to the heating tunnel above the conveyor, and an exit seal (22) positioned at the outlet of the heating tunnel above the conveyor, the entrance and exit seals each being provided with at least one quarter wave trap (24) in order to ensure microwave sealing at the entrance and exit of the heating tunnel.

IPC Classes  ?

• B01J 19/12 - Processes employing the direct application of electric or wave energy, or particle radiationApparatus therefor employing electromagnetic waves
• B01J 19/22 - Stationary reactors having moving elements inside in the form of endless belts
• B01D 11/02 - Solvent extraction of solids
• F26B 3/347 - Electromagnetic heating, e.g. induction heating or heating using microwave energy
• F26B 15/18 - Machines or apparatus for drying objects with progressive movementMachines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
• F26B 17/04 - Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materialsMachines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
• F26B 25/00 - Details of general application not covered by group or