RU2047063C1 - Device for drying materials - Google Patents

Abstract

FIELD: drying materials. SUBSTANCE: device has vortex nozzle for forming vortex rotating gas flow. The nozzle and charging branch pipe define the ring space for entering swirled ring flow into the drying chamber. The width of the space can be controlled. The drying agent is fed to the chamber through lances arranged coaxially with respect to the outlet end of the charging branch pipe and shifted in the direction of movement of the material to be dried to define rotating flow of the drying agent. This contributes to swirling the flow of the material to be dried in its moving inside the drying chamber. EFFECT: enhanced efficiency. 5 cl, 2 dwg

Description

 The invention relates to drying materials, mainly highly viscous pulps and suspensions, for example chicken manure, and can be used to dry materials that are undesirable to be exposed to high temperature.

 Known devices for drying materials, the principle of which is based on spraying and swirling the flow of the dried material moving in the volume of the drying chamber.

 Closest to the invention is a device for drying materials, comprising a drying chamber with loading and unloading nozzles, a tuyere for supplying a drying agent, and a gas duct for forming a vortex rotating gas stream for spraying and moving the dried material to the outlet of the drying chamber. The flue is made in the form of tuyeres located on the side wall of the drying chamber. In the direction of the flow to the outlet of the drying chamber, additional tuyeres are located for supplying the drying agent.

 However, the peripheral location of the loading nozzle and the implementation of tuyeres for swirling the flow in the side wall of the drying chamber does not allow using the more efficient principle of spraying the material introduced into the drying chamber, based on the creation of a vortex in the form of an annular layer concentrically covering the flow of the dried material fed into the drying chamber.

 To implement this principle of spraying the material introduced into the drying chamber in a device for drying materials, the gas duct for forming a vortex rotating gas stream is made in the form of a vortex head, which forms an annular gap with a loading nozzle for introducing a swirling gas stream into the drying chamber.

 The vortex head can be made in the form of two coaxially arranged annular channels separated by an annular partition having slanted openings for swirling the gas flow, the female channel being in communication with the compressed gas source, and the male channel forming an annular gap with the outlet of the loading nozzle for introducing swirling annular gas flow into the drying chamber.

 To regulate the size of the annular gap between the vortex head and the loading nozzle, the latter can have a conical shape and is mounted with the possibility of axial movement.

 To reduce excess heat exposure in the zone where the material is introduced into the drying chamber and maintain an optimal drying regime along the entire length of the chamber, tuyeres for feeding the drying agent can be arranged coaxially relative to the output end of the loading nozzle and displaced along the movement of the dried material, forming a rotating stream of the drying agent, contributing to the twisting of the flow of the dried material during its movement in the drying chamber.

 To increase the stroke length of the dried material, the drying chamber may have annular partitions forming labyrinth channels.

 In FIG. 1 shows a diagram of the proposed device; figure 2 section aa in figure 1.

 The device comprises a drying chamber 1 made in the form of a cylinder 2.

 The loading unit 12 is equipped with a perforated vibrating tape 13 with holes for draining the liquid with a loading nozzle 14. For supplying material to the loading node, there is a pump 18 for collecting the suspension, a shut-off valve 19, a tank 20 and a shut-off valve 21.

 The vortex head 8 is made in the form of two coaxially arranged annular channels 22 and 23, separated by an annular partition 9 having obliquely located holes 10 around the circumference of the partition.

 Channel 23 by means of a pipe 11 is in communication with a source of compressed gas, and channel 22 forms an annular gap with the outlet of the loading nozzle 14 for introducing a swirling annular gas stream into the drying chamber. The loading nozzle 14 has a conical shape and is mounted with the possibility of axial movement, which provides regulation of the size of the annular gap.

 The end part of the drying chamber is equipped with an external tuyere belt 4, into which the blast heated in the heater 6 is supplied using the high-pressure fan 5. From the tuyere belt 4, the blast through nozzles 7 directed at a certain angle to the radius of the drying chamber enters the drying chamber, creating vortex rotation.

 The drying chamber has annular partitions 3 forming labyrinth channels. At the outlet of the drying chamber there is a discharge pipe 16 for the exit of the dried material and an opening 15 for draining the condensate. The discharge pipe 16 is connected to a receiving device 17, which can be made in the form of a discharge cycle or pneumatic classifier, dividing the dried product into fractions.

 The device operates as follows.

 The source material through the loading unit 12, in which partial separation of excess moisture takes place, enters through the nozzle 14 into the drying chamber, where at the outlet of the nozzle it is exposed to the destructive effect of an atmospheric tornado formed by the vortex head 9. The initial product is introduced into the center of the air tornado, where the pressure drop and the vortex effect disrupt the mass of the suspension into microvolumes of solid and liquid media, which instantly receive the interface (and at a new qualitative level, a significant of less energy-intensive, since the evaporation is very energy intensive process). Under the influence of the vortex from the vortex head and the additional tightening effect of the heated blast of the external tuyere belt 4, the mixture of vapors of the liquid dispersion medium and the solid dispersed phase passes through all the labyrinths of the drying unit in series, making rotational-translational movements.

 The solid phase loses excess moisture and is dried, the liquid phase condenses and drains through hole 15.

 A high degree of spraying of the dried material helps to reduce the temperature necessary for drying, which is especially important when drying materials such as chicken droppings, where it is necessary to preserve protein and other useful components that break down at high temperatures.

Claims (5)

 1. DEVICE FOR DRYING MATERIALS, comprising a drying chamber with loading and unloading nozzles, a vortex nozzle for supplying spraying and transporting agents, and tuyeres for supplying a drying agent, characterized in that the outlet section of the vortex nozzle is installed with the formation of an annular gap with a loading nozzle, located along the axis of the camera.  2. The device according to claim 1, characterized in that the vortex nozzles are divided by a cylindrical longitudinal perforated baffle into the inlet and outlet chambers, the first of which is connected to a source of compressed gas, and said annular gap is located in the zone of the outlet chamber of the nozzle.  3. The device according to claim 1, characterized in that the loading pipe is made in the form of a cone and mounted with the possibility of axial movement.  4. The device according to claim 1, characterized in that the tuyeres for supplying a drying agent are located coaxially and with a shift forward along the flow relative to the output end of the loading pipe.  5. The device according to claim 1, characterized in that the drying chamber is equipped with annular partitions forming labyrinth channels to increase the length of movement of the material.

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