RU2013723C1 - Vacuum continuous-belt drier for loose materials - Google Patents

Abstract

FIELD: vacuum drying. SUBSTANCE: drier has housing 7 with evacuation system and water steam removal system. Drier is also provided with belt conveyer with outer belt 11 and inner belt 12 having common drive drum 9 and different swivel rollers 14 and 13. Outer belt 11 embraces unloading drum 10 and swivel roller 14 is screened and is provided with moist material accumulator 15 arranged inside it. EFFECT: enhanced efficiency. 4 dwg

Description

 The invention relates to techniques for vacuum drying bulk materials and can be used in food enterprises and in other processing industries.

 Known single and multi-tier continuous belt dryers for drying bulk materials, operating both under vacuum and at atmospheric pressure. For example, a VTI single-belt direct-flow dryer for granular materials, containing a drying corridor divided into four zones, a furnace, a mixing chamber, and a conveyor in the form of a plate mesh tape.

 The disadvantage of this installation is the low intensification of heat and mass transfer due to the lack of mixing of the dried material over the thickness of the layer.

 Also known is a continuous belt vacuum dryer for bulk materials with parallel operation of conveyor belts, comprising a housing with a vacuum system, a conveyor belt, heating elements.

 The main disadvantage of this dryer is its large size and high energy consumption.

 The closest in technical essence to the proposed one is a continuous vacuum radiation dryer containing a housing with a vacuum and water vapor removal system and a belt conveyor mounted inside it, thermocouples, loading and unloading devices.

 The main disadvantages of the dryer are large dimensions due to the multi-tiered conveyor and high energy consumption.

 The aim of the invention is to reduce the size and reduce energy consumption.

 This goal is achieved by the fact that in a continuous vacuum belt dryer for bulk materials, including a housing with a vacuum system and the removal of water vapor and a belt conveyor mounted inside it, thermocouples, loading and unloading devices, the conveyor is equipped with internal and external tapes having a common driving drum and different swivel rollers, and the outer tape bends around the unloading drum, and one of its swivel rollers is latticed and equipped with a wet m material.

 Based on the research on the sources of patent and technical information, we can conclude that the set of essential features is new and allows to reduce the dimensions of the installation and reduce energy consumption.

 Technical solutions whose properties would coincide with the properties of the claimed, not found. Therefore, the claimed technical solution meets the criterion of "Significant differences".

 In FIG. 1 shows a continuous vacuum belt dryer for bulk materials; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 - unloading drum; in FIG. 4 - conveyor belt.

 The dryer contains loading and unloading bins 1, 2 with shut-off valves 3, 4 connected to the vacuum system by means of nozzles 5, 6, a housing 7 connected to a vacuum pump and a water vapor condenser by means of nozzle 8, a driving drum 9, an unloading drum 10, outer 11 and inner 12 of the conveyor belt, rotary rollers 13, trellised rotary roller 14 of the outer belt 11 with the wet material storage 15 placed therein with a screw feeder 16, intermediate rollers 17, emitters 18.

 The dryer operates as follows.

 Bulk material from the evacuated loading hopper 1 through the shut-off valve 3 under the action of its own gravity enters the previously evacuated housing 7 into the screw feeder 16, which is then fed to the drive 15.

 When the drive drum rotates at a low angular velocity, the conveyor belts will begin to move. The tapes have mesh cells 19 (Fig. 4), filled with material. Initially, the dried product from the drive 15 enters the cells of the inner tape 12. The filling of the cells above the thickness of the tape (Fig. 4) is prevented by a rotating lattice roller 14, which sweeps off the excess product towards the moving inner tape 12.

 With further movement, the inner tape is covered on top with an external tape of similar design and the wet material is inside the mesh chambers.

 When the tapes pass through the driving drum 9, material is poured from the cells of the inner tape 12 into the cells of the outer tape 11 and the product begins to move to the unloading drum 10, which has unloading windows and estrus (Fig. 3). When the outer tape 11 with the dried material passes through the drum 10, the product is unloaded under the action of gravity through the discharge windows and estrus to the bottom of the dryer, and then through the valve 4 into the evacuated hopper 2.

 The advantages of the proposed dryer: reducing the size of the working drying chamber and the entire installation; decrease in metal consumption; reduction of energy consumption when drying the product on the upper and lower branches of the conveyor with the same emitters.

Claims (1)

 CONTINUOUS VACUUM TAPE DRYER FOR BULK MATERIALS, comprising a housing with a system for evacuating and removing water vapor, equipped with a conveyor belt with a conveyor belt, a driving drum and rotary rollers, thermocouples, loading and unloading devices, with the purpose of reducing and storage, which dimensions and reduce energy consumption, the conveyor is equipped with an external belt, and the unloading device is made in the form of a drum, while both belts interact with with the front driving drum and various rotary rollers, the outer tape bends around the unloading drum, and one of the rotary rollers interacting with it is made lattice and is equipped with a wet material storage inside.

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