SU590564A1 - Method of drying heat-sensitive materials - Google Patents

Description

materials, for example, grain or sunflower seeds, which consists in alternating heating cycles and drying the dried state of the material for 30 to 60 seconds and binning, the duration of which increases with decreasing humidity from cycle to cycle from 2 to 10 minutes. The method provides for a constant, regardless of humidity, flow rate of the material being dried in the dryer, which is achieved by controlling the number of cycles of heat carrier purging and binning. As the humidity in each cycle decreases at the end of the purge, the material is heated to the maximum allowable temperature.

Distinctive features of the HBJU method. Constant (independent of moisture) material consumption in the dryer, an increase from cycle to cycle of spinning time from 2 to 10 minutes and heating of the material in accordance with the maximum permissible temperature corresponding to the humidity at the end of the cycle.

FIG. 1 shows schematically a dryer for carrying out the proposed method with purging zops arranged in parallel, FIG. 2 - the same, with the zones of a purge located one above another.

In the first embodiment, the fresh material in arrow 1 enters the receiving bupker 2, from which, with the help of a blade feeder 3, is sent to a cascade apparatus 4, in which it is dried and heated to the maximum allowable temperature with simultaneous cleaning of lightweight impurities. The coolant into the apparatus 4 is supplied by the fan 5 from the furnace 6. The dried and heated material with norium 7 enters the hopper 2 for the binning, from which the feeder 3 will be sent to the next cascade apparatus 4. The device of the hoppers 2 for the binning, feeders 3 and cascade machines 4 each zone is the same. The material is transferred with the help of Noria 7 sequentially from one zone to another until it is dried to standard moisture. The material then passes through conveyor 8 to cooler 9, into which external air is forced by fan 10. From the apparatus 4 and the cooler 9, the spent coolant enters the sedimentary bunker 11 to separate the lightweight impurities. The dried and cooled material according to arrow 12 is removed from the dryer and sent to storage. The number of zones included in the dryer depends on the magnitude of the decrease in humidity in each zone and on the specified decrease in humidity in the material being processed.

If it is possible to develop a dryer in height, for example, if reinforced concrete silos for the elevator are used for it, separate cascade machines with bunkers for binning it is advisable to install one child over another. Such an arrangement allows a reduction in the number of lifts and, consequently, of transport mechanisms.

According to this variant (Fig. 2), the fresh material in arrow 1 enters the receiving bin 2, from which the feeder 3 is fed to the cascade apparatus 4, in which the material is dried and heated to the maximum permissible temperature during movement along the blown shelves 13. Then the material is deposited in the receiving bin 2, located under the apparatus 4, and after the binning comes into the next apparatus 4 of the same design as the previous one.

Stages of purging the material for 30 - 60 s in the loosened layer in the cascade apparatus and subsequent binning for 2 -

10 minutes are repeated until the material acquires the desired humidity. From any zone of the dryer, material can be removed and sent to the cooling zone. The number included in the cooling process

the zones and, consequently, the cooling time is set depending on the desired temperature non-failure in the grain and is regulated in the same way as in the drying process. The predetermined direction of the material is established by the valves 14. Fresh coolant comes from the firebox b and is distributed through the collector 15 to the drying rooms. Cooling air is distributed through manifold 16. Collectors 17 for exhaust air and heat transfer media are combined into a common 18, which is connected to purification devices, such as a sedimentary chamber or cyclones. According to calculations, the introduction of the proposed method on a dryer with a capacity of 80 tons of grain per hour allows to achieve an average annual economic effect of 70 thousand rubles.

Claims (1)

Invention Formula A method of drying heat-sensitive materials, such as grain, sunflower seeds, by conducting cycles consisting of alternating stages of heating the material and its binning, disposable post-cyclic cooling of the material and controlling the number of cycles depending on the moisture content of the source material, differing the fact that, in order to intensify the drying process and increase efficiency, the flow rate of the material being dried is maintained constant in all cycles and the duration of extraction is varied from cycle to cycle. increasing it from 2 to 10 minutes, and heating in each cycle is carried out up to the maximum allowable temperature corresponding to the humidity present in the material at the end of the heating stage in this cycle. Information sources, taken into account during the examination 1. Application No. 2135770, according to which a positive decision was made to issue an author's certificate, cl. F 26B 3/10, 11.05.75, five SRig 2