SU352100A1 - DRYER FOR BULK AGRICULTURAL PRODUCTS - Google Patents

Description

This invention relates to a technique for drying bulk agricultural products.

A known dryer for bulk agricultural products, such as onions, contains several chambers with perforated inclined bottoms, limiting the height of the layer of the product being processed and air distribution ducts, equipped with loading and unloading mechanisms and a heat ventilation system.

During the harvest from the fields, the onion contains excess moisture and in most cases is infected with neck rot, the development of which leads to significant losses during storage in warehouses. This can be avoided if the onions are subjected to special heat treatment in a stream of air at a stable temperature.

In order to uniformly supply the product to be processed, as well as to improve the conditions for its heat treatment in each chamber of the proposed dryer, there are parallel air ducts with openings, a cascade product distributor and a pipeline for recycling exhaust air.

FIG. 1 shows the proposed dryer, the main section (on the right side shows the moment of the initial stage of filling kieviepbi, and on the left - during the warm-up and drying); in fig. 2 - sheath; and the scheme of the dryer.

perforated sloping heads 2, limiting bars 3 of the height of the product being processed, the heat fan system and transporting their devices. In each chamber, to prevent condensation of water vapor, there is a system of parallel ducts 4 with openings, as well as a cascade distributor 5 of the product and a pipeline 6 for recirculation of exhaust air.

Powered dryer as follows.

Onions are dumped into a receiving bunker 7, from where an inclined conveyor 8 is fed into the loading room. Here the bow is poured over a horizontal conveyor 9, passing along the receiving hatches 10. At the intersection point of the conveyors a separation device is installed} 1. Then, along the inclined chute 12 and the cloth sleeve 13, the bow falls on the cascade distributor 5, which is a series of horizontal shelves installed at a certain angle and covered with material softening the blows. Moving by gravity along an inclined plane 14, the bow gradually fills the chamber, while the upper boundary of the layer is controlled by the height limiter 3. The air heated in the tube heater 15 by the centrifugal fan 16 through the pipeline 17 is fed into the air duct 18. From the duct, passed through the layer 19 exposed

heat treatment of onions, the air enters the upper zone 20 of the installation. Part of the humidified air through the collector 21 through the fan goes into the atmosphere. From line 6, air is taken out for recycling (recirculation) of exhaust air.

In the case of chambers being filled with a cold onion with a high humidity, a compensating system is installed, consisting of a series of ducts parallel to the slit-like openings 4. Using a belt conveyor 22, the finished product is unloaded, which flows by gravity from the chambers located higher than that.

The parameters of the process of heat treatment of onions controlled devices installed on the stationary shield 23.

Subject invention

Dryer for bulk agricultural products, such as onions, containing several chambers with perforated sloping bottoms, limiting the height of the layer of the product being processed and air distribution ducts, equipped with loading and unloading mechanisms and a heat-vent system that differs from and improve the conditions of its heat treatment, in each chamber there is a system of parallel ducts with holes, a cascade distributor of products and that a conduit for recirculation of exhaust air.

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