RU2334185C1 - Drier of vibrofluidised bed - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: drier of vibrofluidised bed contains loading device of moist material with auger feeder, drying chamber, heater, system of spent air cleaning, at that in upper part of drying chamber there is fan with motor installed, and bottom of product capacity of drying chamber represents perforated surface, which is covered with metal mesh made of stainless steel with the thinnest openings and on which rippers are installed in the form of spring-loaded inertial masses with blades, and above product capacity there is filter installed, which is shaken on completion of drying process manually or with automatic accessory, air is supplied under perforated surface through the air heater and filter.

EFFECT: increase of drying efficiency.

3 cl, 3 dwg

Description

The invention relates to techniques for drying dispersed materials and can be used in microbiological, food, chemical and other industries.

The closest technical solution to the claimed object is a dryer by.with. USSR No. 553424, F26B 17 / 10.1975, containing a loading hopper of wet material with a screw feeder, a drying chamber with a support grid, a furnace with a mixing chamber, a turbo-gas blower and an exhaust air purification system (prototype).

The disadvantage of the prototype is the relatively low productivity of drying the final product.

The technical result is an increase in drying performance.

This is achieved by the fact that in a dryer of a vibro-boiling layer containing a wet material loading device with a screw feeder, a drying chamber, a heater, an exhaust air purification system, according to the invention, a fan with an engine is mounted in the upper part of the drying chamber, and the bottom of the product chamber of the drying chamber is perforated the surface, which is covered with a stainless steel metal mesh with the thinnest holes and on which cultivators are placed in the form of spring-loaded inertial ma with the blades, and above the product container is a filter that is shaken after the drying process by hand or automatic device, air is supplied under a perforated surface through an air heater and filter. The inertial mass can be made in the form of an inverted cup with a central hole, on the side surface of which there is a helical groove for connecting it to the coil spring by means of a fastening element, and at least three blades are placed on each inertial mass, the axes of which are located in the plane, parallel to the perforated surface, and the blades themselves are installed in at least three brackets fixed to the end of the glass and are made in the form of a screw. The ripper blades, made in the form of a screw, can be mounted in brackets movably with the possibility of rotation around its axis, for example by means of a friction or rolling bearing assembly.

Figure 1 shows a diagram of a drying installation, figure 2 shows a General view of the cultivator, figure 3 - node mounting blades.

The fluidized bed dryer contains a drying chamber, in the upper part of which a fan 1 with an engine 2 is mounted. The bottom of the product chamber 5 of the drying chamber is a perforated surface 8, which is covered with a stainless steel metal mesh with the thinnest holes. The filter 6 located above the food container prevents particles of even the finest grinding from being carried away by the air stream. The filter is shaken off after the drying process by hand or by automatic device 7, while individual particles are again deposited in the food container 5. Air is supplied under the perforated surface 8 through the air heater 3 and filter 4.

The dust generated during the drying process can also be captured in the dust cleaning system, which can be performed (not shown in the drawing) from an acoustic installation, the optimum parameters of which for sound processing of medium-sized dust are the sound pressure level of 140 dB or more, the oscillation frequency of 900 Hz, dust concentration in the air stream of at least 2 g / m ³ , scoring time 1.5 ... 2 s, and a cyclone, the hopper of which is connected with containers for dried material. The acoustic unit in this case is connected to the exhaust pipe of fan 1, and its output is connected to the input of the cyclone. At the same time, the bag filter can be dismantled, which will significantly increase the height of the fluidized bed and the performance of the installation as a whole.

Rippers (FIGS. 2 and 3) are mounted on a perforated surface 8. Each of them is made in the form of a spring-loaded inertial mass 11 of the inertial mass 12 with blades 13, for example, of the plate or rod type. As an elastic element 11, a conical or cylindrical coil spring can be used, one end of which is secured to a perforated surface 8 by a sleeve 14 and a nut 15, and the other is connected to an inertial mass 12.

The inertial mass 12 is made in the form of an inverted cup with a central hole, on the lateral surface of which there is a helical groove for connecting it to the elastic element 11, for example, a helical spring by means of a fastening element (not shown in the drawing), and at least 12 are placed on each inertial mass at least three blades 13, the axes of which are located in a plane parallel to the perforated surface 8, and the blades 13 themselves are installed in at least three brackets 16 fixed to the end of the glass and can be Nena a screw 17. The blades are made as a screw, mounted in bracket 16 adjustably rotatable about its axis, for example by friction bearing assembly (opening 18, the finger 19) or rolling.

The fluidized bed dryer operates as follows.

The principle of operation of the dryer is that a granular or dusty product is loosened by air flow and transferred to a suspended state. The necessary air flow is created by a fan 1 mounted on the upper part, which is driven directly from the engine 2. The air drawn in from outside or from the working room is first supplied to the air heater 3, where it is heated to the required temperature. At the same time, air is filtered from foreign particles in it with the help of filter 4, then the flow of hot air passes from bottom to top through the material in the product container and takes moisture away from it as soon as possible. The bottom of the product container 5 is a perforated surface 8, which is covered with a stainless steel metal mesh with the thinnest holes. Depending on the choice of the bottom design and the speed of the air flow, it is possible to increase or decrease the fluidization of the material. The filter 6 located above the food container prevents the entrainment of particles of even finest grinding by the air stream. The filter is shaken off after the drying process is completed manually or with automatic device 7, while individual particles are again deposited in the product container.

The dust generated during the drying process can also be captured in the dust cleaning system, which can be performed (not shown in the drawing) from an acoustic installation, the optimum parameters of which for sound processing of medium-sized dust are the sound pressure level of 140 dB or more, the oscillation frequency of 900 Hz, dust concentration in the air stream of at least 2 g / m ³ , scoring time 1.5 ... 2 s, and a cyclone, the hopper of which is connected with containers for dried material. The acoustic unit in this case is connected to the exhaust pipe of fan 1, and its output is connected to the input of the cyclone. At the same time, the bag filter can be dismantled, which will significantly increase the height of the fluidized bed and the performance of the installation as a whole.

The dryer operates in such a way that when transmitting its perforated surface 8 of vibrational vibrations in a predetermined frequency range from the vibrator 10, rippers containing a spring-loaded inertial mass 12 with blades 13 oscillate in the vertical plane and transfer the vibrational energy to the upper layers of the material, while mixing it in the underlying layers. An even greater mixing of the material particles along the height of the layer is provided by auger-type blades mounted movably in the brackets 16. An additional advantage of this design is the uniform distribution of the fluidizing agent (gas) achieved by the action of rippers, which is supplied under the perforated surface 8.

The proposed installation is intended for drying products in the pharmaceutical industry.

Claims (3)

1. A dryer of a boiling layer comprising a wet material loading device with a screw feeder, a drying chamber, a heater, an exhaust air purification system, characterized in that a fan with a motor is mounted in the upper part of the drying chamber, and the bottom of the product chamber of the drying chamber is a perforated surface, which is covered with a stainless steel metal mesh with the thinnest holes and on which cultivators are placed in the form of spring-loaded inertial masses with blades, and above A filter box is located in the container, which is shaken after the drying process is completed manually or by an automatic device, air is supplied under the perforated surface through an air heater and a filter. 2. The dryer according to claim 1, characterized in that the inertial mass is made in the form of an inverted cup with a central hole, on the side surface of which there is a helical groove for connecting it to the coil spring by means of a fastening element, at least each inertial mass being placed , three blades, the axes of which are located in a plane parallel to the perforated surface, and the blades themselves are installed in at least three brackets fixed to the end of the glass and are made in the form of a screw. 3. The dryer according to claim 2, characterized in that the ripper blades, made in the form of a screw, are mounted in brackets movably with the possibility of rotation around its axis, for example, by means of a friction or rolling bearing assembly.

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