RU132171U1 - INSTALLATION FOR DRYING WET MATERIALS - Google Patents

Abstract

Installation for drying wet materials, including a stationary casing containing a cylindrical cyclone chamber with a nozzle for tangential inlet of a coolant, a raw material feeder and a discharge snail connected to one of the chamber end walls along its axis, characterized in that it has internal and external sets of blinds with the possibility of their rotation to enter the coolant, as well as internal and external screw guides.

Description

The utility model relates to the technique of drying in swirling air flows, in particular materials that are prone to sticking, and can be used in the chemical, petrochemical, mining and processing, metallurgical, engineering, microbiological and food industries, building materials industry and in environmental processes of drying dust waste .

A known design of a pneumatic dryer for thermolabile materials, comprising a chamber, a nozzle for spraying a solution, a pipeline for supplying a coolant, a discharge pipe of dried material connected to the pipeline, (RF patent No. 2328670, F26B 3/12).

The design flaws include the large dimensions of the apparatus and the clogging of the nozzle.

A drying apparatus is known, comprising a vertical cylindrical vortex chamber with a lid in the upper part, a wet material loading nozzle, a device for removing dried material in the form of a gas suspension, and a coolant inlet device and a vortex dust collector including a vertical housing, a dust chamber, a tangential peripheral flow inlet nozzle , an axial pipe for introducing a central flow of gas suspension and an exhaust pipe of purified gas located in the upper part of the housing, characterized in that the coolant inlet device is made in the form of a conical pneumatic tube mounted coaxially at the bottom of the chamber, with the upper ends of the pipe located in the chamber cavity and the loading nozzle coaxially mounted on the top cover of the chamber, while the device for draining the dried material is made in the form of two unidirectional snails, one of which is located outside the loading pipe and communicated with the tangential pipe for introducing the peripheral flow into the dust collector, and the other is outside the pneumatic pipe and communicated with the axial pipe in ode central gas suspension flow at the output end of the loading tube and the annular discs mounted pnevmotruby overlapping radially camera input in the cochlea, and between the discs attached swirl vanes. (RF patent No. 2030699, F26B 17/10).

The disadvantages include the large size of the apparatus and the low drying speed.

Known dryer for solutions, suspensions and pastes, containing enclosed in a casing with the formation of an annular cavity of the drying chamber with a lateral surface of plates installed with a gap relative to each other to enter the drying agent into the chamber, and a spray device inside, as well as tangential nozzles for entering the drying agent into the chamber cavity through the plates and the discharge of the gas suspension into the separation system for separation of the finished powder (ed. St. No. 881484, F26В 3 / 12.15.11.1981).

The disadvantages of the spray dryer and the method of drying in it are the high material costs for manufacturing and operation, low manufacturability, adhesion of the dried product to the walls of the drying chamber.

Closest to the proposed installation in technical essence is a drying installation for drying bulk materials, containing a cylindrical cyclone chamber with a nozzle for tangential inlet of a coolant, a feeder of raw material and a discharge snail connected to one of the chamber end walls along its axis (ed. St. No. 579514 , F26B 17/10, 1/5/1978)

The disadvantages of the prototype of the dryer when used for drying high-moisture and liquid materials are the adhesion of the dried material on the walls of the drying chamber.

The objective of the proposed design of a pneumatic dryer is the ability to dry high-moisture materials with increased adhesive ability, the absence of sticking of the material when it gets on the wall of the drying chamber, reducing the drying time, reducing metal consumption.

The technical result is achieved by creating an air base layer on the walls of the drying chamber from two air streams, allowing wet particles not to stick to the walls of the drying chamber and contributing to the wet material to quickly and accurately dry. To do this, the installation for drying wet materials, including a stationary housing containing a cylindrical cyclone chamber with a nozzle for tangential inlet of a coolant, a raw material feeder and a discharge snail connected to one of the chamber end walls along its axis, has an internal and external set of blinds with the possibility of their rotation to enter the coolant, as well as internal and external screw guide.

Figure 1 is a side view.

Figure 2 is a top view.

Figure 3 - section aa

Figure 4 - cutout In

The drying unit has a fixed body 1, which contains two multidirectional snails 2 and 3. The snail 2 serves to supply a drying agent, and the inner part of the shell of the snail 2 has a crown with a set of adjustable blinds 4, which are located at an angle. An external screw guide 5 provides for the gradual lifting and drying of the material. The pipe 6 serves to supply the drying agent, it passes into the perforated pipe 7, after which the drying agent goes through a set of adjustable blinds 8. The internal screw guide 9 provides a gradual lifting and drying of the material. The wet material is fed through the feeder 10 to the drying chamber 11. The dried material, waste heat carrier and evaporated moisture are removed from the apparatus through the cochlea 3, and, after that, the dried material is separated on the cyclone.

Installation works as follows. Wet material enters the drying chamber 11 through the feeder 10. After entering the chamber 11, the material is picked up by the air flow, which is created by the scroll and the supply pipe of the drying agent 2 and 6 using a set of adjustable shutters 4 and 8, set at a certain angle, which is selected based on from the dimensions of the installation, the diameter of the sprayed particle, and also depends on its density, the dynamic viscosity of the drying agent and the acceleration of gravity. The inner and outer screw guide 9 and 5 carry out the lifting of the dried material, as well as evenly distribute the supplied drying agent. Thanks to the installation of a set of adjustable blinds 4 and 7, the supplied drying agent forms an underlying layer, or we can say “air cushion”, by which the adhering wet material is prevented from sticking to the walls of the drying chamber 11.

The drying agent mixed with the material dries the initial product in a swirling air stream created in the drying chamber 11 and rises up along the helix created by the internal and external screw guides 9 and 5. Wet and heavy particles fall down and re-enter the action of the drying agent . So they are dried in the lower part, and, gradually getting rid of moisture, they rise and are removed from the drying chamber 11 through the cochlea 3 together with evaporated moisture and spent heat carrier and fed to further processing.

Thanks to the creation of an air undercoating layer with the help of blinds, it is possible to achieve fast high-quality drying of wet material without fear of burning to the walls of the drying chamber of the apparatus.

Claims (1)

Installation for drying wet materials, including a stationary casing containing a cylindrical cyclone chamber with a nozzle for tangential inlet of a coolant, a raw material feeder and a discharge snail connected to one of the chamber end walls along its axis, characterized in that it has internal and external sets of blinds with the possibility of their rotation to enter the coolant, as well as internal and external screw guides.

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