FI85624C - FOERFARANDE OCH ARRANGEMANG FOER EFFEKTIVISERING AV SAEDESTORKNING I EN SILOTORK AV CELLTORKSTYP. - Google Patents

Description

85624

METHOD AND ARRANGEMENT FOR EFFICIENCY OF CEREAL DRYING IN A CELL DRYER-TYPE SILO DRYER

The invention relates to a method and arrangement for improving the drying of grain in a cell dryer-type silo dryer, in which the grain is recycled by feeding it to the top of the silo and unloading it from the bottom to a lifting device which lifts it up to the silo through air ducts through the grain in the silo. The invention can also be applied to a continuous dryer in which the grain is dried by a single drop through a silo.

15 A silo dryer with cells is the most common type of dryer today. Most typically, this works on the recycling principle, with the grain being recycled past the drying cells until the moisture has dropped to the desired value. The essential parts of the dryer are the silo, the inlet and outlet air ducts or cells arranged in the middle thereof, the rows of cells, a feeder placed below them and an elevator or pneumatic conveyor with which the grain drained down by the feeder is lifted back to the silo. The grain is dropped into the silo through a pre-cleaner that separates debris from the grain. 25 There are several different types of pre-cleaners.

In known dryers, grain drying takes place by supplying warm air from the inlet cells through the grain to the outlet cells.

! Drying thus takes place only in a narrow zone in the middle of the silo * .i 30. The function of the feeder is firstly to determine the rotational speed of the grain in the dryer, secondly to provide an airlock between the grain and the bottom row of exhaust cells so that moist exhaust air does not escape through the feeder to the bottom of the silo and further to the elevator. Likewise, above the cells must be arranged. a similar airlock that prevents moist air from escaping upwards. This is achieved by arranging the top layer of grain as thick as possible. However, in known silo dryers, moist air escapes both downwards and upwards. This results in: 40 condensation of moisture first on the cold surfaces in the lower and upper parts of the silo 2 85624 and further on the grain circulation. With thermal insulation of surfaces, condensation can be reduced but not completely eliminated. At the top of the silo, compaction also takes place during the cycle in its cooled crop. This wetting of the grain greatly reduces the drying efficiency. In addition to thermal insulation, efforts have been made to reduce the problem of wetting by sucking moist air out through the pre-cleaner and also from the bottom of the silo with a vacuum cleaner. An example of this is Finnish patent publication 48502. However, air suction has a very small effect on humidity conditions.

The object of the invention is to eliminate some of the problems mentioned and to increase the efficiency of drying. The features of the method according to the invention are set out in claim 1. According to the invention, the grain is not allowed to get wet in the lower part of the silo. In addition to the lower part of the silo, efficient drying also takes place in the airlock layer. The characteristic features of the silo dryer for carrying out the method are set out in claim 2.

20

In the following, the invention will be described by way of example with reference to the accompanying figures, which show a silo dryer according to the invention.

25 Figure 1 Silo dryer main units without oven

Figure 2 Cross-section of the silo from point II-II in Figure 1

The invention has been applied in practice by making the necessary modifications to the ANTTI ™ dryer, the type designation of which is "automatic V 30 79".

The water evaporated from the grain to the drying air is prevented from condensing on both the grain and the equipment as follows. In place of the suction of the lower end 13, pressurized hot air is led along the pipe 2 to the grain feed hopper 27 of the lower end of the gesture 35 and further to the pipes 11 and 12.

From the downcomer 12, air enters the hopper at the bottom 13 of the silo. In the pipe 12 and in the lower part 13 of the silo, hot air flows against the grain falling from the feeders 14, effectively drying it and preventing moisture condensation in these parts and in the elevator 16. Due to the air jet orientation and the countercurrent of the elevator, hot air does not enter the elevator. 5

Between the supply device 14 and the distribution damper 15 and preferably also through the distribution damper 15, air penetrates through the grain into the discharge cell 6 and from there through the chamber 7 into the discharge pipe 10.

The passage of air, at the lower end, as opposed to before, is facilitated by throttling the flow opening of the lowest row of hot air cells 4 with a damper 5 and cutting off the chamber 7 with a manifold 8 and adding an outlet pipe 10.

15 The lower parts of the silo remain dry and the grain is also exposed to drying in these parts and not watered as before.

At the top of the silo there is a grain pre-cleaner, dispenser and dryer 28. To this device a hot air pipe 11 is led from the hopper 27 of the elevator 20 starting at point 17. Here the pipe 11 is connected at a steep angle to the downcomer 12 with the air flow to the upper end and largely directly from the bend of the pipe 11 along the thin pipe 30 to the extractor 26.

25

The device 28 also acts as a distributor for the grain falling from the elevator 16, so that the slit 19 starting from the downcomer 1 sheds part I of the grain at the beginning of the distributor 22 and part collides with the distributor in the middle. : ... · In this case, the grain is divided into two vanes the width of the dryer, in which case the filling of the grain can be increased by approx. 2 m3.

The pipes 11 are thus led to the blow duct 24. The hot air 35 comes into good contact with the grain flowing from the elevator 16 and falling from the distribution plate 22. This keeps the grain coming to the top of the tank 20 warmer than the air coming through the grain from below. In this case, condensation of water back into the grain does not occur. In addition, the dampers at the top 20 remain dry. Compensation-

Claims (3)

A method for streamlining grain drying in cell drying type silo dryers, wherein the grain feed is circulated by feeding it into the top (20) of the silo and draining it by means of a feeding device (14) in the lower part (13) of the elevator (16). ) or the like, which transports it up for feed into the silo, and where drying is mainly effected by blowing in warm air through the air ducts found in the middle part of the silo through the grain in the silo, characterized in that it is prevented. in the middle part of the silo outlet, the moisture condensation of the air saturated in the lower part (13) of the silo by blowing in warm air also in the lower part (13) of the silo. 1. Menetelmä vilu kuivauksen tehostamiseksi kennokui-vaajatyyppisessä siilokuivurissa, jossa willa kierrätetään syöttämällä se siilon yläosaan (20) ja purkamalla sitä syöttö-20 laitteen (14) avulla alaosasta (13) , ja jossa kuivaus tapahtuu pääasiassa puhaltamalla lämmintä ilmaa siilon keskiosassa olevien ilmakanavien kautta siilossa olevan the will lip, tunettu siitä, one estetään siilon 25 keskeltä poistuvan kylläisen ilman kostuden tiivistyminen . alaosane (13). ; ! 2. Patenttivaatimuksen 1 mukaisen butmen toteutta- "V miseksi tarkoitettu järjestely kennoilla (4,6) yes syöttölaitella (14) varustetussa, kennokuivaajatyyppisessä siilokuivurissa (16) 27), elevaattorilta yläosaan (20) yhdistetty syöttöputki (18) the will pudottamisek si siiloon, sekä kuivausilman tulo- ja poistokanavat (1,9,10), ... 35 tunnettu siitä, one kuivuriin kuuluu tulokanavaan (1) lisäkanava (2) kuivausilman johtamiseksi elevaattorin (16) syöttösuppilon (17) luota laskuputkea (12) pitkin siilon alaosaan (13) yes noble alapuolisen wiljakerroksen lapi poistokanavaan (10) 5 85624 3. Patenttivaatimuksen 2 mukainen järjestely siilokui-vurissa, tunnettu siitä, etä ainakin osa alapuolisen ilmalukon muodostavista jakopelleistä (15) on suurelta alaltaan rei'itetty, edullisimmin ne ovat suomupeltejä. A system for accomplishing the method of claim 1 provided with cells (4, 6) and feeding device (14), in a cell dryer type silo dryer, comprising a tapping tube (12) coupled from the lower portion (13) of the elevator to the elevator. (16) feed hopper (27), a feed pipe (18) 25 from the elevator to the upper part (20) for pouring the grain into the silo, and input and output ducts (1, 9, 10) for the drying air, characterized in that the dryer hear a tili I! the inlet duct (1) or some other heat source connected additional duct (2) to conduct the drying air from the elevator (16) supply funnel (17) via the tapping tube (12) to the lower part of the silo (13) and further through the lower part bearing of grain to the outlet duct (10). 3. A silo dryer system according to claim 2, characterized in that at least part of the distribution plaques 35 (15) which form the lower air reading to a large extent are perforated, most preferably heeled plaques. 0 »* 0 0