SU1509019A1 - Apparatus for cooling sunflower seeds after drying - Google Patents

Abstract

The invention relates to a technique for the processing of bulk food products and can be used to cool bulk granular materials subjected to preliminary heat treatment. The purpose of the invention is to improve the quality of cooling of sunflower seeds. The cooling device comprises a rectangular chamber 1 with a gas distribution grid 2, under which a duct 3 is installed, communicated with an air supply system and divided by vertical partitions 4 into three sections for the individual supply of cold air. The gas distribution grid is installed with a negative angle of inclination α = 3-5 ° with a stepwise reduction of the flow area S in sections 0.25S, 02S, 0.15S, respectively, and in the chamber above the grid, the strikers 8 are at an angle of 50-60 ° to the horizontal. 1 il.

Description

3150

The invention relates to a technique for the processing of food products and can be used to cool bulk granular materials, such as sunflower seeds.

The purpose of the invention is to improve the quality of cooling of sunflower seeds.

The drawing schematically shows the device.

The device for cooling sunflower seeds after drying contains a cooling chamber 1 of rectangular cross section with a gas distribution grid 2, under which a box 3 connected to the air supply system is installed, divided into three sections by movable vertical partitions 4 using connectors 5. Air is supplied through nozzles 6 feed. Negative tilt angle oi. 3-5 ° of the gas distribution grid 2 is adjusted by a screw mechanism 7. Three chambers 8 with an angle of inclination of 50-60 ° to the horizontal are installed in the chamber, having the possibility of vertical movement and dividing the chamber into three working compartments. Each baffle has an individual mechanism for moving and fastening (not shown). The device has a loading hopper 9, an unloading bunker 10 for sunflower seeds, and a nozzle 11 for exhaust air.

The total area of the holes S of the gas distribution grid 2 located above the duct sections is 0.255, 0.28 and 0.155, respectively.

The cooling device operates as follows.

After drying, the heated sunflower seeds with temperature through the loading hopper 9 are fed into the cooling chamber 1 to the gas distribution grid 2, and the screw mechanism 7 sets the negative angle of inclination of the grid depending on the capacity of the chiller and the initial temperature of the sunflower seeds. Observing the boiling regime in the working chamber, lower the bump stops 8 and set them at such a height to prevent the individual seeds from being carried away. Heated after sushi

Seeds are washed off with cold outside air and cooled. The flow rate of air permeating the material is different in each working section of the duct 3. In

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d

five

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due to the large cross section, it is maximum and achieves fluidization in the second section, the air velocity in the second section is close to creating a fluidized bed, and in the third section it is sufficient to form a dense moving layer.

Thus, at the maximum heating temperatures of the material, the process is most intense, as the temperature decreases, the cooling process is conducted in the fluidized bed mode and in the third zone the seed temperature gradually decreases and approaches the temperature of the exhaust air. This mode is the most economical. The cooled material is discharged through the discharge hopper 10, and the exhausted air through the nozzle 11 is discharged after cleaning into the atmosphere.

When installing the gas distribution grid 2 with a negative angle of inclination, the average residence time of individual particles in the cooler increases, which increases the depth of cooling, the inclination angle c / (–3 ° is recommended for small seeds and o (, With a further increase in the inclination angle an increase in the filling of the working chamber with the material, and this leads to a sharp increase in the total air flow, especially for the first working section, and requires an increase in the capacity of the fans for air supply, which profitable.

It has been established that with an increase in the flow area of more than 0.255, there is a danger of individual seeds failing when the fans stop in the sublattice space, and with a reduced flow area less than 0.158, the hydrodynamic resistances of the gas distribution grid increase, which leads to additional energy consumption.

The angle of the strikers 8 is selected within the limits of / i 50-60 °, since it ensures the return of individual seeds that are subject to drift when a pulsation and emission in the layer occurs, back to the working section ..

The proposed device for cooling sunflower seeds after drying allows improving the quality of the cooling process.

515090196

Claims (1)

 The formula of the invention is that, in order to improve the quality of cooling, the gas-distributing device for cooling the seed separator grid is installed from the bottom after drying, with an inclination angle of 4.3–5 to the rectangular CE horizontal working chamber towards the boot from the gas distribution grid-bunker, and the total area of the hole grate, under which the communication S of the gas distribution areas is installed air duct with air supply system, lattices located above the sections divided by vertical barriers, the box Kami into three sections with individual 0,255, 0,25 and O, 155, while in the chamber baffles for air supply, each section of the duct mounted located at the beginning and end of the sieve — at an angle of 50-60 to the horizontal with the cart, respectively, the boot and the possibility of moving along the vertical cargo bunkers, distinguished-15b nicks.