SU1451503A1 - Recirculating installation for drying grain - Google Patents

Abstract

Invention m. used in the procurement industry and agriculture. The purpose of the invention is to intensify the drying process, to increase the efficiency and operational reliability of the installation. The installation contains two parallel cascade heaters 1 with bunkers

Description

one

The invention relates to a grain dryer for days of grain and milk and can be used in the procurement industry and agriculture.

The aim of the invention is to intensify the drying process, increase the economy and operational reliability,

A schematic illustration of a recirculation unit for drying

grains.

A recirculation plant for drying grain contains two parallel-running cascade heaters 1 with bins .2 above them, two grain dryers 3 for drying the grain in the recirculation stage and two grain dryers 4 for drying and cooling it. The installation includes two loading conveyors 5, autonomous for each heating of the truck 1 conveyor 6 dp of recirculating grain and conveyor 7 Dp of dried and cooled grain fed to storage. For loading the grain dryer 3, two elevators 8 are installed. and long loading grain dryers 4 installed elevators 9, From each elevator, two gravity flow pipelines 10 dp of grain supply to any of the grain dryers of the corresponding purpose were held, From loading conveyors 5, gravity flow pipelines dp of grain supply to noria 8, loading grain dryers 3, or in noria 9, loading grain dryers 4, Self-flowing

5 pipelines provide the supply of grain from the conveyor 6, the loaded dryer 3, in elevator 9 (according to the main scheme) and to the conveyor 7 (in the variant of the reduced scheme) dp

About removing dry and cooled grains. On the side of the exhaust ducts, along their entire height, sediment chambers 11 are attached to the mines of the grain dryers 3 for the organized collection of waste

5, the heat carrier ate, as well as the sedimentation of grain carried out from the boxes and, and between the pairs of grain dryers there are sedimentary chambers 12, separated by a vertical partition 13, Vverku

0 sediment chambers 11 and 12 on both sides of the end walls arranged parallel to the ducts, there are exhaust windows 14 of the exhaust heat carrier overlapping, shuttered by louvre grilles. In the sediment chamber windows of the grain dryers 4, rotary shutters are installed dp adjusting the flow rate of the exhaust coolant released into the atmosphere,

0 sediment chambers, storage bins 15 are installed with gate valves 16 for impurities and grains withdrawn from the ducts, which are periodically removed by the pneumatic conveying system 17 to the hoppers 2 of the cascade heaters I, where the separation of impurities and grains takes place.

In the sedimentary chambers at the boundary between the first and second zones of drying, rotary valves 18 are installed on the axles, driven by a manual winch or lever. Knanaraii partially overlap the inclined trays 19 installed above them. Sediment chambers 11 and 12 under partitions 19 with valves 18 are connected to pipelines 20 of the spent heat carrier, which are post-furnace from the chambers 21. Before entering the mixing chambers of each pair of grain dryers, filters are installed - spark arresters 22. The original grain enters for drying, for example, from operational silos of the elevator through a gravity pipeline 23 with an adjusting valve, recirculated grain through pipelines 24 with an adjusting gate valves enter hoppers 2 above heaters. Dried and cooled grain is removed from the installation to storage through a 25-day pipeline ensuring flexibility of the circuit on pipelines 10 after noria 8 and 9, as well as two-position switching valves 26 are installed in pipelines 24, providing grain supply from noriya in any zernosupshlku sootvetstvuyushchy cycle, and rehshchrkul and that - in any heater.

Dp of providing a downward change in the temperature of the heat transfer medium in the mines on the pipelines 27 from the furnace are fitted with branch pipes 28 for suction of atmospheric air to the second and third zones of the grain dryers. In the recirculation cycle and to the first and second zones of the grain dryer 4, in the cycle of drying and cooling, gates for regulating the flow rate and temperature of the coolant are installed in front of all zones in the pipes from the furnace. The possibility of a separate control of the costs of the spent coolant that is returned to the furnace after the grain recirculation and drying is in the sediment chamber between them has a vertical partition 13.

The recirculation unit works with an optimal circuit including

1451503

. Q four grain dryers, using the example of ki of food wheat grain with normal gluten at an initial moisture content of 25% as follows.

Grain to the breeder from the operational silos of the silo building or the working tower of the elevator enters through the pipeline 23 into the bunker 2 above the cascade heaters, these bunkers also flow through the pipeline 24 recirculating grain after collecting in the drying bins of grain dryers 4. In the heater, the grain is heated to 15 TO temperature 50 the maximum permissible heating and at the same time is dried and cleaned from light impurities and dries. From the preheaters, the mixture of grain is fed through loading and unloading conveyors 5 and elevators 8, which it is fed into the dryer 3. The flow of grain in these dryers is the same as X 1 in the preheater. The grain is unloaded from the grain-25 parallel streams to the conveyor 6, which is fed into the elevator 9, loading grain dryers 4 - for drying and cooling the grain. At a given initial humidity, the second 30 Pbie zones in these grain ejectors of the throttle flaps are disconnected from the firebox and work as cooling. In grain dryers 4, the grain output is controlled by the moisture content of the grain, which gg should be in the range of 13.5-14.0%. A grain mixture in the amount of 300-320 t / h enters the mines of grain dryers 4. The discharge from these mines is about 140 t / h, i.e. a difference of 160-180 t / h of the Q grain is returned to the recirculation cycle for mixing with the initial one in the bins 2, and the dried grain is withdrawn from the plant through line 25.

Exhaust coolant from the sedimentation chambers 11 and 12 enters through pipelines 20 into the furnace unit 21, in which it mixes with fresh coolant, where the spark arrester filters 22 prevent the ingress of unburned particles and dust into the ventilation system, and enters drying zones. The impurities accumulated in the first zones above the trays 19 and the grain once per shift are discharged into the g 15 bins at the base of the chambers of the second and third zones. This operation is carried out by lowering the valves 18 under the action of its own weight, and then returning to the initial position by a winch or a pivoting lever. From the buakers, 15 impurities and grains are periodically blown out by pneumatic transport system 17 into the hoppers 2 above the cascade heaters.

Claims (4)

1. Recirculation plant for grain drying, containing a first cascade heater with a bunker in the upper part connected to the supply line, a three-zone silo dryer with a central gas distribution chamber divided by horizontal partitions into compartments, each of which is through a pipe section and fan, communicated with the top1451503 the process of day, increase of economy and operational reliability, the installation additionally contains a second cascade heater with a bunker similar to the first one connected to the PL line and three silo dryers, all of the grain dryers are grouped in pairs with its 10 noria, communicated by means of transporting mechanisms with each of the heaters, and with each other - through sedimentary chambers, with each sedimentary yamera, located 15 between the groups, divided into two parts by a vertical partition. 2, Installation according to claim 1, characterized in that the rotary valves of all sedimentary chambers are supplied with atmosphere and the sedimentary Kama-2o in the upper part with an inclined chute. rgmi on the side walls of the ottomans Well "1nnyh S top louvered, 3. Installation on PP. 1 and 2, o  for the exit of spent heat exchanger, and in the middle part - rotation and 2, which differs from the retif that it is equipped with a pneumatic transport system. PTO driven valves, c. lower-. 25 n (1st part - bunker for gathering tusheunos and grains blown out of boxes, a device for sampling recirculating zyrna and its dosed mix- ing with initial grain and elevators with a trundle 30, which differs, for the purpose of intensification on the one hand, connected to the bunkers of sedimentary chambers, and on the other hand, to the bunkers of cascade heaters. 4. Installation on PP. 1-3, characterized in that the pipelines after each elevator are equipped with two-way valves. , 3. Installation on PP. 1 and 2, o 1 and 2, it is different with a retif that it is equipped with a pneumatic transport system. on the one hand, connected to the bunkers of sedimentary chambers, and on the other hand, to the bunkers of cascade heaters. 4. Installation on PP. 1-3, characterized in that the pipelines after each elevator are equipped with two-way valves.