SU1325271A1 - Drier - Google Patents

Abstract

The invention relates to the technology of drying dispersed materials and improves productivity and efficiency by combining the processes of drying and separation in a single shaft. A shaft 7 with open ends 8 and 9 is installed along the axis of the shaft 1. The bottom end 9 is located below the row of nozzles 6. The top end 8 is located in the plane of the inlet of the central nozzle 3, which serves to drain the spent heat carrier. In the upper part of the pipe 7 above the side nozzle 4, which serves to load the material, there is a paddle deviator 11. The jet-vortex interaction of the gas with the material in those flows with the separation and entrainment of the fine part of the gas suspension, which enters the upper part of the shaft in the zone LZ 11 serving as a dust collector. The axial portion of the stream passes through the paddle swirler 11 and acquires an additional impulse, while the dust particles are pressed against the wall of the shaft in the area of the dust concentrator, increasing the concentration of the peripheral layers of the carrier gas stream. The accumulated dust is recycled, discharged into the mine. 3 il. , i ii Phi.1

Description

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The invention relates to techologies. drying of dispersed materials and can be used in the production of chemical products, mineral raw materials and mainly mineral fertilizers, for example, potash flotation concentrates, which are prone to water clodiness and adhesive interaction.

The purpose of the invention is to increase the productivity and efficiency by combining the processes of drying and separation in one mine.

FIG. 1 schematically shows the proposed dryer; in fig. 2 is a section —A-A in FIG. one; in fig. 3 is a section BB in FIG. one.

The dryer contains a vertical shaft 1 with a conical clamp 2, provided in the upper part with a central 3 and lateral 4 nozzles, and in the lower part - with an annular gas distribution manifold 5, covering the shaft.

In this zone, mine 1 has equally spaced rows of nozzles 6 for heat transfer fluid. A tube 7 with open ends 8 and 9 is installed along the shaft 1 axis. The bottom end 9 is located below the bottom row of nozzles 6, and the top 8 to 9 in the plane of the inlet of the central nozzle 3, which serves to drain the spent heat transfer fluid through the pipe 7 and an annular gap 10. The pipe 7 in the upper part of the shaft is equipped with a paddle vortex 1 located above the side nozzle 4, which serves to load the material with the help of the sealer 12. The discharge chamber 13 with the window 14 serves for unloading the material. nozzles 6 pre covered with snail

the motion of the falling annular layer at the top of the shaft.

The choice of the initial velocity for supplying gas jets of the radial directional nozzles 15. The nozzles 6 in the shaft 1 pacno-j of the material are repeated as they are lagged by horizontal rows: in the upper part of the shaft with the radial direction of the axes, in the lower part of their axis they are oriented chordally, forming tangent to the circle , the diameter of the rod is determined by the creation of the benefit of which does not exceed 0.4 diameters of the pleasant hydrodynamic conditions, the mines under which the kinetic energy

The jets are sufficient for the material disinfection process. At the same time with

Relative number of rows of nozzles

with radial and chordal orientation, dispersion of its lumps at the axes is assigned taking into account the characteristic renewal of the surface of the tick of the drying object (the value of the initial intercomponent heat and mass and the adhesion-safe wet drying proceeds intensively, the product content). achieving adhesive safe

The selection of the inner diameter of the conical clamp 2 is carried out by experimentally selecting the conditions for the diaphragm of the flow of the gas suspension flowing in the annular zone between the wall of the shaft 1 and the outer wall of the pipe 7, ensuring a stable process of concentration and separate removal of the vapor phase of moisture being removed in the axial zone through the pipe 7.

The design parameters of the paddle swirl 11 are assigned, based on the principle of twisting only the axial layers of the carrier flow of the gas- 5 suspension. The outer diameter of the blades is limited by the diameter of the nozzle-3.

The dryer works as follows.

The coolant is introduced into the snail socket 15, it is distributed over the volume of the collector 5 and flows into the interior of the shaft i through the system of gas distribution nozzles 6, thus separating into jets.

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The system of radial jets —at the top; —the lower part of the shaft in each row is developed to impact interaction with the outer surface of the pipe 7.

The initial wet material is fed along the side loading nozzle 4 and the falling layer is distributed over the cross section of the peripheral zone by the pipe 7 and the conical pinch 2 by means of a gas flow, the vortex flow of which is pinch locally at the outlet of the shaft 1. Coming down into the mine, the material enters the zone of active dispersion of its lumps by radial interaction of the radial jets emanating from the nozzle 6 ,, with the surface of the pipe 7.

Impact of jets with the capture of parts suspended in a stream of wet

the motion of the falling annular layer at the top of the shaft.

The choice of the initial velocity for supplying the gas jets of the radial directional material is repeated as it is caused by the creation of favorable hydrodynamic conditions under which the kinetic energy

In this state, the material acquires a spin momentum, which is reported by a system of gas jets of chordal direction, and continues to move along a spiral-downward trajectory in the lower part of the shaft 1.

The given orientation of chrrdap jets allows heat treatment of the material in the zone of the greatest opening of the jets. During turbulent inflow of chordal jets, the system of interaction between the gas and the falling layer of the upper zone is activated, as the vortex movement of the upward gas flow between the radially flowing jets increases the number of boundary layers of the medium, accelerating the energy exchange of the contacting phases and contributes to the expansion of the gas jets allows to ensure uniform and deep heat treatment of the compacted material.

In the process of intensive heat and mass transfer of material with a gas in the lower part of the shaft accumulates the vapor phase of the removed moisture, which is concentrated and separated in particular by rarefaction through the pipe 7.

The jet-vortex interaction of gas with the material in the mine proceeds with the separation and entrainment of the fine part of the gas stream, which enters the upper part of the shaft 1

in the zone the dust cone is

11 serving

Prioseva part of the stream passes through the swirler 11 and acquires an additional impetus. After exiting the swirler, dust particles are pressed to the inner wall surface due to centrifugal force.

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mines in the area of the dust concentrator, thereby increasing the concentration of the peripheral layers of the carrier gas stream. Separation of gas suspension in

with a dust concentrator, the centrifugal field of the same name with the second zone is conducted. The accumulated dust is recirculated, cussed down into the mine. In the presence of in the upper part of the mine

The fO 10 stream with a high concentration of gas suspension can be diverted separately. At the same time, the mass content of dust fractions is regulated. the flow of the dried product,

15 which, discharging into the discharge chamber 13, is output through the window 14.

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Claims (1)

Invention Formula A dryer containing a vertical shaft with a pinch in the middle part, provided in the upper part with a central and side branch pipes, and in the lower part with an annular gas distributor - with a collector covering the shaft, having on the side surface in this h, there are evenly spaced rows of nozzles for heat carrier. ; characterized by the fact that, with the aim of increasing the pro 1 ;: environmental indicator and economic efficiency by combining the processes of drying and separation in one shaft, the axis of the latter is set. a pipe with open ends, the lower of which is located below the lower row of nozzles, and the upper in the plane of the inlet of the central nozzle, which serves to drain the spent heat carrier, and the specified pipe in the upper part of the shaft is equipped with a vane swirler located above the lateral nozzle, employee loading material. /five FIG. 2 5-6 Fug.Z Compiled by Y. Martinchik Editor I. Nick Olaychz Tehred L. Serdyukova Proofreader M. Pojo         . ... . ;.; Order 3037/34 Circulation 636 Subscription VNIIPI USSR State Committee for Inventions and Discoveries. 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4