SU1321461A1 - Installation for heat treatment of grain - Google Patents

Abstract

The invention relates to the milling industry and can be used in the processing of grain buckwheat, oats. The purpose of the invention is to increase the productivity and quality of grain processing by increasing its preheating temperature while reducing steam consumption. The heat of the secondary steam is used to heat the coolant for the preliminary U., (2 - L g /, 25 15 (L Z2 o

Description

heating grain. At the first stage of the development, warm air with a temperature of 41-47 ° C is fed by a blower 8 to a steam heat exchanger 11. For heating,

The invention relates to the milling industry and can be used for the heat treatment of buckwheat and oats grains.

The purpose of the invention is to increase the productivity and quality of yerna treatment by increasing the temperature of its preheating while reducing steam consumption.

The drawing shows a plant for the heat treatment of grain.

The installation contains a bunker 1 connected by a piping system for preheating the grain, a steamer 2 with charging 3 and 4 discharge stoppers, a super-drying bunker 5, a steam vertical dryer 6, a recuperative steam heat exchanger 7 with a pressure fan 8, a buffer vapor-accumulating vessel 9, a condensate - a collector 10 and a steam recuperative heat exchanger 11. The steam dryer 6 is connected to the heat exchanger 11 by a pipe 12 for collecting the secondary steam through the condensate collector 10 and the pipe 13 for disposal and the condensate from the condensate 10.

With the injection fan 8, the dryer 6 is connected through a steam heat exchanger 11 by a pipe 14 for extracting warm air. A conduit 15 connecting the steaming device 2 to the buffer vapor-accumulating vessel 9 is connected to the condensate collector 10 by conduit 16.

The installation also includes a duct 17 for supplying heated air to the gas distribution manifold 18, inlet and outlet ducts 19 of the heat transfer fluid, installed in a staggered order over the height of the bunker 1 to evenly distribute the coolant throughout the entire volume of the hopper 1, the exhaust manifold 20

from the condensate collector 10, the condensate with a temperature of 98-99 s is fed from the condensate collector 10. Additionally, the air is heated in a steam heat exchanger 7, 1 Il.

heat carrier, pressure gauge 21 controlling the vapor pressure in the steamer 2.

The steam storage vessel 9 is connected via a steam reducer 22 and a steam supply pipe 23 to the heat exchanger 7. A condensate discharge pipe 24 connects the heat exchanger 7 to the condensate collector 10. Air duct 25 connects the injection fan 8 to the heat exchanger 11.

Valves contains valves 26-29. Steam comes from the central highway 30.

The installation works as follows.

From the hopper 1, the grain is loaded into the evaporator 2 through the loading plug cork 3. The valve 27 is opened. Steam is supplied from the central line 30 to a set pressure (0.25-0.30 MPa) in the steamer 2. After performing the steaming operation (with a duration of 3.0-4.0 min), valve 26 is opened and

through the pipeline 15 pairs (secondary) are transferred to the buffer vapor-storage vessel 9 until pressure in it is 0.15 MPa. This is achieved by selecting a given volume of the vessel 9. After the equal pressure of the secondary steam (0.15 MPa) is established between the steamer 2 and the vessel 9, the valve 26 is closed and the valve 28 is opened. As a result

This residual steam is mixed with; the condensate is fed into the condensate trap 10. After a complete discharge from the steamer 2 of the secondary steam, the discharge plug 4 is opened and the grain is discharged into the pre-dryer hopper 5. From this moment the steam 29 is opened in the steam dryer 6 under pressure

0.25-0.30 MPa. Steam, passage through pipelines (not shown) of the steam dryer 6, transfers heat to their heating. From the pipelines, the grain is heated and dried by contact. The secondary steam from the steam dryer 6 under pressure above 0 MPa through the pipeline 12 is discharged into the condensate collector 10, where it is converted into condensate due to expansion. The paroreducer 22 sets a predetermined flow rate of the secondary steam supplied from the vessel 9 to the steam heat exchanger 7 via the steam line 23. Due to the heat transfer to the heating of the working surface of the heat exchanger 7, the secondary steam is condensed and sent via the line 24 to the condensate collector 10. Vessel 9 is installed in such a way as to ensure complete steam outflow at the moment of the start of a new cycle of secondary steam emission from the steamer 2. Intercommunication of steamer 2 with vessel 9 and steam heat exchanger ohm 7 provides non preryvnm heating its surface. The heating of the heat carrier used for preheating the grain is carried out in stages. In the first stage, spent warm

dryers 6 with tempevantor 8 forcing through the duct into the steam-water heat exchanger It. Regulate the continuous flow of steam from the tank

tram 41-47 C sucked

condensate condenser 10 with a temperature of 98-99 C. The passage through the heat exchanger 11, the air is heated to 89-92 ° C. After the first stage of heating, air with a temperature of 92 ° C. The injection fan 8 is supplied to a steam heat exchanger 7, where the second stage is carried out to additionally heat it to a higher temperature.

The installation allows the use of heat from the secondary steam of the steam dryer to heat the coolant. By a known installation, the secondary steam of the steam dryers is emitted into the atmosphere. Steam heat exchanger 7 increases the efficiency of heat extraction by utilizing the latent heat of vaporization of the secondary steam supplied

from the vessel 9 under pressure up to 0.15 MPa.55 a heat exchanger, and the steam dryer - This allows the coolant to be preheated and communicated with it by a pipeline for the second stage to a temperature of 104– secondary steam through the condensate, then the coolant to - saturation tank and pipeline for tapping

214614

The fan is pumped by the fan 17 to the gas distribution manifold 18. During the loading of the bunker 1, the grain is heated in a falling- 5 layer.

After filling the hopper with 1 grain, the flow of heat transfer fluid through the inlet duct 29 is made in a dense layer. The chess arrangement of the supply of fO of the chucking and tapping ducts 19 ensures uniform preheating of the grain to a higher temperature. Exhaust coolant through discharge ducts.19 through a collector

15–20 is released into the atmosphere. The preheated grain is sent to the steamer 2. Next, the operation of the plant is repeated as described above.

20 Uniform heating of the grain to a high temperature contributes to an increase in the performance of the evaporators by 12% and the coefficients of peeling the grain by 2.3–4.6%.

25 At the same time, the code passed by 1.7% decreases with an increase in the output of cereal grade I.

Thus, by utilizing the latent heat of vaporization of secondary steam and using it to preheat the grain, the invention improves the productivity and quality of grain processing by increasing the temperature

35 preheating it while reducing steam consumption.

Claims (1)

Invention Formula k A plant for the heat treatment of grain, containing a bunker for preheating the grain, a grain steamer, a steam dryer, a recuperative heat exchanger with a pressure fan, a storage tank and a condensate trap, connected by a piping system with shut-off and control valves. characterized in that in order to increase the productivity and quality of grain processing by increasing the temperature prior to heating it while reducing the steam flow rate, it is equipped with a steam pipe 5 1321461 the condensate from the latter and the pipeline connecting the water steamer for extracting warm air from the grain to the buffer vapor-accumulating injection fan through the steam vessel are in communication with the condensate collecting heat exchanger, at that.