SU1575034A1 - Unit for drying loose materials - Google Patents

Abstract

The invention relates to a drying technique using induction heating of metal balls and can be used in the chemical, pharmaceutical and other industries. Improving the quality of drying thermosensitive capillary-porous chemical products using small metal balls is achieved by running on the loading end 22 of an external rotating drum 10 trough-shaped perforated blades 21 that guide the balls into the hopper 20 of the loading unit, and the drum 10 has a solid area around which the electromagnetic inductor 6. The material is removed through nozzle 27, and metal balls circulate through the internal cavities of the drums 9, 10, vanes 21, hopper 20, and screw 18. 2 Il.

Description

The invention relates to installations for drying bulk materials when raising heat to a material by means of an electromagnetic inductor and can be used in chemical pharmaceutical and other industries.

The purpose of the invention is to improve the drying quality of heat-sensitive capillary-porous chemical products using grinding metal balls.

Figure 1 schematically depicts the described installation; in Fig. 2, section A-A on $ ig, 1.

The installation contains a fixed casing, which consists of shells I and 2, between which there is a spiral wound partition 3, through which the drying agent circulates. Pipes 4 and 5 are used to enter and exit the coolant. The inner wall of the casing is an electromagnetic inductor 6, consisting of a dielectric housing 7, in which a winding 8 of a copper insulated wire is located. Inside the casing are installed, with the formation of an annular gap, two rotating drums inner 9 and outer 10, and the drum 10 has a continuous section 11.

, On the inner surface of the drums and 10 mounted blades 12, forming a helical surface for movement of the material. The drums are driven through a shaft 13 installed in the bearing assembly 14 and a gear 15 from the engine 16. The drum 9 is mounted inside the drum using spacers 17.

The loading unit of the drying apparatus consists of a hollow screw 18, a feeder 19, a hopper 20 for returning metal balls to the drum 9 using perforated grooves. blades 21 located on the loading end 22 of the drum 10 at the place of unloading of the finished product. The node has a collector 23 for supplying coolant to the internal cavity of the drum 9. The screw is driven through a V-belt transmission 24 from the engine 25 _O of the coolant is the pipe 26. The finished product is poured through the pipe 27. The collector 23 serves to supply the coolant through the hollow shaft of the screw 18 into the inner cavity of the drum 9.

Installation works as follows.

The wet material is supplied, it is transported to the feeder 19 and the screw 18 to the drum 9. The drying agent through the pipe 4 enters the spiral duct, enclosed between the two shells 1 and 2, where it is heated to a certain temperature from the heat generated by the inductor 6, and through the collector 23 and the hollow screw 18 enters the drum 9. The transport time of the wet material, in this case, is used to preheat it. In addition to obtaining a coolant circulated through the duct, the inductor serves to heat the drum 10, which leads to an increase in the heat transfer surface. This arrangement of the inductor allows you to fully use the heat generated by it. The use of induction heating in combination with hot air blowing is carried out in order to increase the effective (active) zone and drying and to intensify the heat and mass transfer process. In addition, metal balls are introduced into the inner cavity of the drum 9 together with the material, which are mixed with the product and moved from the drum 9 to the drum 10 and further to the discharge site using blades 12 mounted in a checkerboard pattern to form a discrete helical surface. A ferromagnetic body (in this case balls) under the influence of an alternating magnetic field is heated. The reason for the occurrence of heat in a ferromagnetic medium is the so-called eddy currents, which, circulating in the body of a ferromagnetic body, emit heat in it.

The material, having passed the entire drying path, is discharged through the perforation 11 in the drum 10 and the nozzle 27. The metal balls must be larger than the perforation on the drum 10, so they remain on the drum and are picked up by grooved perforated vanes 21. Using vanes 21, metal the balls fall into the hopper 20 and again return to the drum 9, i.e., the balls have a closed cycle of motion.

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The spent coolant, having passed the perforation in the drum 10, is removed through the pipe 26 and goes for cleaning ",

Claims (1)

Claim Installation for drying bulk materials, containing rotating drums installed in one another with guide vanes, the inner of which is connected to the loading device, and the external one is perforated, nozzles for the output of vapors and dried material located respectively in the upper and lower parts of the loading end of the external drum , and a heating source, characterized in that, with 'A-A, to improve the drying quality of heat-sensitive capillary-porous chemical products using grinding metal x balls, the installation is provided with a fixed cover and on the loading end of the drum is further strengthened Ext perforated trough vanes _g A loading device is inserted inside the drum and equipped with a hopper for metal balls at the location of the gutter-shaped perforated blades, while the body of the external drum on the section extending beyond the discharge zone is solid and the heating source is in the form of an electromagnetic inductor placed around this section ".