SU1562644A1 - Drying installation - Google Patents

Abstract

The invention can be used for drying grain and oilseed n. The purpose of the invention is to reduce energy consumption and improve the quality of drying. The drying unit contains a low-temperature dryer (HC) 2 and a high-temperature dryer (BC) 1, communicated among themselves by the coolant. The heat carrier worked in BC 1 can either directly enter the HC 2, or be heated in the heat generator 6, or be emitted into the atmosphere through the heat exchanger 5 to heat the atmospheric air. HC 2 is equipped with a pipeline 18 for discharging the spent coolant and a pipeline for discharging it through a heat exchanger 8 for heating atmospheric air, the air outlet of which is connected to the air input for the heat exchanger heat exchanger 5. 1 cp f-ly, 1 ill.

Description

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15

Atmospheric air

Seeds.

sunflower 9 19 v s

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one.

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Sunflower seeds

Suze rice

Atmospheric air

HC 2 is equipped with a pipeline 18 for discharging the spent coolant and a pipeline for discharging it through a heat exchanger 8 for heating

The invention relates to the field of grain and oilseed drying and can be used in various industries.

The aim of the invention is to reduce energy consumption and improve the quality of drying.

The drawing shows a general scheme of the drying unit.

The drying unit contains a co-® serially-arranged high-temperature dryer 1 for drying, for example, sunflower seeds and a low-temperature dryer 2 for drying, for example, rice grains. The high-temperature dryer 1 contains a heat generator 3 for heating and a fan 4 for injecting coolant and can additionally be equipped with a recuperative waste heat exchanger 5 for preheating the atmospheric air with the exhaust coolant of this dryer 1 before feeding it into a low-temperature dryer 2.35

The low-temperature dryer 2 contains a heat generator 6 for heating and a fan 7 for injecting coolant. It may also contain a heat recovery heat exchanger 8 for preheating the atmospheric air with an exhaust coolant of a low-temperature dryer, 2c then feeding it into the recuperative heat-exchanging heat exchanger 5 of a high-temperature dryer 1.

The pipe 9 of the exhaust coolant dryer 1 pipe 10 with shut-off and control valves connected to the pipe 11 for supplying the coolant dryer 2.

Pipe 12 exhaust heated atmospheric air recuperative heat exchanger-heat exchanger 5 is connected by pipe 13 with the valve-regulating valves through heat 40

45

50

55

VA of atmospheric air, the output of which by air is connected to the inlet by atmospheric air of the heat exchanger-utilizer 5. 1 Cp f-ly, 1 ill.

five

® 5

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five

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generator 6 and fan 7 with pipes 11 supplying drying coolant 2,

Pipeline 14 is designed for supplying coolant to dryer 2, mine heat generator 6.

Pipeline 15 with shut-off and control valves connected patru-. the side 16 of the exhaust preheated atmospheric air recovery heat exchanger heat exchanger 8 with a pipe 16 for supplying atmospheric air heat recovery heat exchanger heat exchanger 5.

The pipelines 17 and 18 are designed for the release into the atmosphere of the spent coolant of the dryers 1 and 2, mine heat exchangers 5 and 8.

The cyclone 19 installed on the pipe 10 serves to clean the spent heat carrier of the high-temperature dryer 1 from various impurities and dust before feeding the heat carrier to the low-temperature dryer 2.

Drying installation works as follows. I

Heat carrier high temperature

the dryer 1, designed, for example, for drying industrial sunflower, with a temperature of 150-160 ° C enters the dryer 1, where it gives a part of its heat to the heated sunflower seeds and evaporation of the required amount of moisture from them, then with a temperature of 70-80 ° C and a relative humidity of 15-70% out of the dryer 1.

If the relative humidity is o1

if the heat carrier of the high-temperature dryer 1 is less than 20-30%, it goes through pipeline 10 through the cyclone 19 directly to the inlet of dryer 2, for example, for drying rice, where it gives some of its heat to heating the rice and evaporating the required amount of moisture from it, whereupon with a temperature of 40-50 ° C and a relative humidity of 70-80%, it leaves the dryer 2 and is discharged through line 18 to the atmosphere. At that, the excess of the spent heat carrier of the high-temperature dryer 1 is vented to the atmosphere through the pipeline 17, and the temperature of the heat carrier before the low-temperature dryer 2 can be lowered by partial mixing of cold atmospheric air or increased by heating in the heat generator 6.

If the relative humidity of the spent heat carrier of the high-temperature dryer 1 is more than 20-30%, then it enters the heat-exchanger-heat exchanger 5, where it warms up atmospheric air in the amount of 60-70 ° C required for drying the rice in the low-temperature dryer 2, then with a temperature of 30-40 ° C and a relative humidity of 90-100% are vented to the atmosphere. The atmospheric air heated in the heat exchanger 5 by the pipelines 13 and 14 enters the inlet of the dryer 2, where it transfers part of its heat to the heated rice and evaporates the required amount of moisture from it, then leaves the dryer with a temperature of 40-45 C and high relative humidity 1 and through line 18 is vented to the atmosphere. If the heat of the spent heat carrier of the high-temperature dryer 1 is insufficient for heating in the heat exchanger-utilizer 5 of atmospheric air supplied to the low-temperature dryer 2 to 60-70 ° C, then the spent coolant of the low-temperature dryer 2 enters the heat exchanger-heat exchanger 8, where it heats the atmospheric air to 30-40 ° C the amount of air required for drying the rice in the dryer 2, then with a temperature of 25-30 ° C and a relative humidity of 90-100% is vented to the atmosphere. The atmospheric air heated in the heat exchanger 8 by the pipeline 15 enters the heat exchanger 5, where it is heated to 60-70 ° C and is supplied to the dryer 2 by pipes 13 and 14, while the temperature of the coolant before the low-temperature dryer 2 can be necessary, increased by heating in the heat generator 6.

The use of the invention by reducing the average temperature of the spent heat carrier of the drying unit and its consumption eliminates or significantly reduces the fuel consumption for heating the heat carrier of the low-temperature dryer. In addition, providing a softer drying mode in a low-temperature dryer allows, for example, for rice grain to reduce its fracture during the drying process, i.e. improve its quality.

Claims (2)

1. Drying unit containing high-temperature and low-temperature dryers with inlet and outlet nozzles for the coolant, pipelines for intake of atmospheric air connected to the high-temperature and low-temperature dryers, and 5, the pipeline for exhaust coolant emission to the atmosphere after a low-temperature dryer with a heat-exchanger-heat exchanger; drying quality when performing all pipelines and lines with shut-off and control valves, high temperature exhaust pipe and further comprising a line of ejection of spent heating medium in an atmosphere with a waste-heat exchanger provided with pipes for supplying and discharging air atmosfer5 Foot, the latter of which is connected to the low-temperature heat medium supply conduit of the dryer. 2. The installation according to claim 1, that is, that the heat exchanger-heat exchanger of the exhaust heat pipeline to the atmosphere of the low-temperature dryer is equipped with an atmospheric air inlet pipe and an atmospheric air inlet pipe connected to the atmospheric air heat exchanger-utilizer pipe high temperature dryer. five