SU987337A1 - Gas distributing apparatus of shaft grain dryer - Google Patents

Description

The invention relates to a technique for drying grain in a mobile dense layer and can be applied in grain-receiving enterprises of the harvesting system and in agriculture. A gas-distributing device for a shaft-type grain dryer is known, which contains boxes for supplying and discharging coolant interlocked in pairs and placed along the height of the shaft successively. C1) Disadvantages of the device are low productivity and efficiency of the drying process. It is also known to have a gas distributor device for a silo grader containing inlet and outlet units of variable cross section for heat transfer media, arranged in a staggered order and provided with oblique forming faces in the upper part, and on the side walls there are blinds, and the inlet ducts are placed inside The exhaust ducts on the same axis with the latter and in the prismatic part are equipped with thermal insulation C2 in order to avoid burning the material. The disadvantage of the device is the unsatisfactory intensity of the drying process. The closest to the invention according to the technical essence and the achieved result is the gas distribution device of the mine grain dryer containing feed and discharge boxes arranged in rows in a staggered order and having inclined edges and longitudinal partitions 31. The drawbacks of the device are the increased dimensions of the boxes, breaking the uniformity of distribution of heat ositel along the length of the box, the presence of stagnant zones. The purpose of the invention is to intensify the process of drying and cooling the grain, improving the quality of its processing and ensuring uniform distribution of the heat carrier along the length of the ducts. This goal is achieved by the fact that the boxes are made with a corner of the opening angle of 30-40, which is rounded at the apex, and the number of rows of outlet ducts is twice as large as the number of inlets. In this case, the partitions are curved. FIG. 1 schematically shows dihedral boxes and their mutual arrangement; section BB in FIG. 2; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section B-B in FIG. 2, in FIG. 4 — node I in FIG. 1 (the bend of the inclined faces at the top, on an enlarged scale).

The gas distributing device of the mine. Grain dryers contains inlet ducts 1 and outlet ducts 2 installed in rows, and the number of rows of outlet ducts is twice as large as inlets. The feed and discharge ducts consist of inclined faces 3 and a curved partition 4. The angle at the apex of the faces is rounded and is 30-40. If the minimum distance for the passage of the grain is P, the remaining dimensions for the passage of the grain without stagnant zones and with its fullest possible mixing in the stream are as follows: the distance between the discharge ducts along. vertical and horizontal lines 5B, vertical recess between the supply boxes 7.5P, horizontal distance between the supply and discharge boxes vertical and horizontal 2.5E; height of boxes 3,165R; thickness of the blown layer of grain with a speed on the longitudinal section of the box 0.8 m / s at a speed of 0.4 m / s 2P.

The smaller the size of the box, the smaller the thickness of the blown layer and the smaller the minimum distance for the passage of grain E. The size of the box is chosen on the basis of the physical and mechanical properties of the bulk material, the purpose of the installation, considerations, reliability, economy and other conditions.

Gas distribution device operates as follows.

The heat carrier from the feed box 1 enters the grain layer, heats it (cools) and leaves the discharge duct 2 through. The opening angle of the vertex faces, which is 30-40 °, eliminates stagnant zones.

In order to evenly distribute the coolant over the length of the duct, it is necessary that the static pressure, the coolant in each duct cross-section be the same (pressure stress due to friction can be neglected). The equality of pressure in each cross section of the duct is achieved by the fact that its internal volume is divided by a special longitudinal curvilinear partition of variable width (Fig. 2). The closed non-working volume of the box performs the role of air insulation, and the surfaces of the faces, if necessary, are protected with a layer of insulation. A box with a face angle of 40 ° is made of a dihedral or tetrahedral constant or variable external cross section, depending on its length, in order to ensure the speed of the spent coolant at the exit of the duct /

5 not exceeding the permissible value. The proposed gas distribution device of the shaft grain dryer will allow to intensify the process of drying and cooling the grain, to increase

0 quality of its processing and to ensure uniform distribution of the coolant along the length of the boxes.

Claims (3)

1. Gas distribution device of the mine grain dryer, containing feed and discharge ducts, 0 arranged in rows in a checkerboard pattern and having inclined faces and longitudinal partitions, characterized in that, in order to intensify the process of drying and protecting the grain and improving the quality of its processing, the boxes are made with a rounded angle of 30 ° 40 °, with the number of rows of discharge ducts being twice as large as the supply. 2. The device according to claim 1, characterized in that, in order to ensure a uniform distribution of the heat carrier along the length of the ducts, the partitions are curved. Sources of information taken into account in the examination 1. USSR author's certificate 159138, cl. F 26 V 17/12, 1963. 0 2. USSR inventor's certificate No. 161665, cl. F 26 B 17/12, 1963. 3. Authors certificate of the USSR 530153, cl. F 26 B 17/12, 1974. Mf / rjtO zone offfew // - / Phag.