Patent FR-2998952-A1 (FR)
Title: Device, useful for drying grains, comprises drying tower associated with hot air generator, where drying tower is connected to upper part of generator by conduit to cause recycling of air inside box having air
Inventor: LAFARGUE ERIC
IPC: A23B9/08
Filed: 2012-12-03
Abstract: The drying device comprises a drying tower (Ts) associated with a hot air generator (Gc). The drying tower is connected to an upper part of the generator by a conduit (C) to cause recycling of air inside a box having air, which is a mixture of outside air and combustion air (Ac). A combustion temperature is an essential operating parameter. The operating parameter is manually or automatically controlled by a control panel. A furnace (Fo) is provided with a slag trap and a booster fan, which homogenize a temperature of the furnace for combustion of the waste. The drying device comprises a drying tower (Ts) associated with a hot air generator (Gc). The drying tower is connected to an upper part of the generator by a conduit (C) to cause recycling of air inside a box having air, which is a mixture of outside air and combustion air (Ac). A combustion temperature is an essential operating parameter. The operating parameter is manually or automatically controlled by a control panel. A furnace (Fo) is provided with a slag trap and a booster fan, which homogenize a temperature of the furnace for combustion of the waste. The generator comprises: in its lower part, a furnace, which receives vegetable waste injected by an injector; and, above its bottom, a unit for mixing hot combustion air with outside air injected to an upper part of vertical baffles. The outside air is injected by the booster fan equipped with adjustable flaps at a temperature of 350[deg] C. The hot air generator further comprises a device for filtering waste residues. The filtering device includes a circularly rotatable first filter for preventing clogging, and a second filter located at an exit of a decompression chamber in the form of rectangular rotating walls. The remaining waste in the filter is taken by the booster fan. The fan prevents projection of waste or residues on cereal grains. The second filter removes all particles or remaining wastes, and is made of metal frames covered with a stainless steel grid pad. The rotating walls of the filter rotate in front or back by 180[deg] about axes for effective cleaning when the rotating walls are traversed by hot air at 115[deg] and by a flow of hot air based on frequency of rotations and the quality of injected waste. The drying device further comprises power devices including a reception hopper, which measures a precise and regular dosage of the waste injected to the furnace, conveyors that receive the waste by scraping a bunch located in upstream of the conveyors and to transport the bunch to a device comprising essential units, splitting screws preventing bunch of unwanted waste, a support plate located behind the splitting screws to recover the waste out of a path, a feed screw, a screw for injecting the waste to the furnace, a second hopper located at the feed screw, temperature probes configured to manage the security of the drier, user interfaces, and a three-phase voltage generator. The trap is located in a short path perpendicular to the feed screw, which is actuated by a bailer that acts as a firewall. A combined operation of the supply and reception of waste is controlled by timed sequences for adjusting burning operation of the waste. The support plate and the splitting screws are provided with swiveling axes. The furnace is present in the form of a circle, supplies a combustion material by the injection screw, and comprises circular and radial pipes connected to the fan. The essential unit includes a first detector located on a flank of a cavity, a second detector located on a flank of the hopper, and a third detector located on the hopper. The first detector detects significance of waste flow and jams, and enables to stop injection of the waste until the flow of waste returns to normal. The second detector regulates the amount of waste. A first sensor is located on the upper part of the generator, and detects an abnormal elevation of the temperature to a value displayed on the control panel by generating a default, which stops the drier. A second sensor is positioned on the injection screw. The control panel is configured to drive the manually or automatically the filters and fan based on information of the sensors and detectors, and includes a cupboard control panel. The user interfaces is configured to control the control panel. A first interface is connected to a microphone computer to visualize the sequencing of the drier. The drying device operates from waste plant.