KR101897973B1 - Cold wind dryer for agricultural products with improved energy saving efficiency - Google Patents

Abstract

The present invention relates to a cold wind dryer for agricultural products with improved energy-saving efficiency, and more specifically, to a cold wind dryer for agricultural products with improved energy-saving efficiency, which circulates dehumidified and dried air in a drying chamber to continuously dry the agricultural products stored in the drying chamber through the dehumidified and dried air without a steaming process of the agricultural products.

Description

Technical Field [0001] The present invention relates to a cold wind dryer for agricultural products,

[0001] The present invention relates to a cold air drying apparatus for agricultural products with improved energy saving efficiency, and more particularly, to a system and method for circulating dehumidified and dried air in a drying chamber by continuously circulating dried products stored in a drying chamber through dehumidified and dried air, And more particularly to a cold air drying apparatus for agricultural products having improved energy saving efficiency.

Generally, various types of drying methods such as hot air drying, cold air drying and freeze drying are used for drying various industrial products and agricultural and marine products.

Among them, the hot air drying method is to continuously supply hot air at a temperature of 50 to 80 DEG C to the drying object placed in the drying chamber to evaporate moisture contained in the drying object and to dry the drying object.

The hot air drying method as described above is advantageous in drying industrial products such as textile products because it can relatively easily dry the laundry, but when the agricultural products or aquatic products that are weak in heat are dried, it causes thermal deformation of agricultural and marine products, As well as deteriorating the inherent taste and flavor and destroying the nutrients, the hot air drying has a disadvantage that the subject to be dried is limited in application.

In addition, the hot air supplied to the drying chamber contains a large amount of moisture due to moisture evaporation of the object to be dried, and since the hot air including the moisture must be discharged to the atmosphere, there is a disadvantage that heat loss is large, There is also a problem that the laundry is contaminated.

Meanwhile, in the cold air drying method, the air in the drying chamber in which the drying object is loaded is maintained at 0 to 50 ° C to circulate continuously, and by using the heat pump system, the moisture contained in the circulating air is removed and the dry air is circulated Thereby promoting the drying of the dried material.

The cold air drying has a drawback in that the drying speed is slower than hot air drying. However, the drying can be performed at a relatively low temperature as compared with the hot air drying, thereby preventing thermal deformation of the drying object.

Conventional wet-type dryers use a conventional heat pump system having four components: an evaporator and a compressor serving as a low-temperature heat exchanger, a condenser serving as a high-temperature heat exchanger, and an expansion valve.

Here, the refrigerant, which is a working fluid, circulates through the four components and repeats the change of evaporation-compression-condensation-expansion. The refrigerant absorbs external heat in the evaporator and vaporizes. At this time, the air in the circulation passage The moisture contained therein condenses on the outside of the evaporator due to the condensation phenomenon and is discharged to the outside of the dryer, so that the dehumidified and dried air circulates in the drying chamber, thereby promoting the drying of the laundry.

The refrigerant, which has been put into a dry saturated vapor state by the evaporator, is adiabatically compressed by a compressor to become a refrigerant in a superheated steam state at a high temperature and a high pressure, and the refrigerant having passed through the compressor flows into a condenser to discharge latent heat of condensation, And the discharged heat is absorbed into the circulation passage and flows into the drying chamber. The refrigerant in the saturated liquid state is repeatedly introduced into the evaporator in a low-temperature, low-pressure, wet state via the expansion valve.

However, in the conventional wet-type dryer as described above, when the inside air of the drying chamber is introduced into the circulation passage and the heat is taken away from the evaporator, the heat recovered from the condenser is recovered again. .

This means that, in the case of conventional wet-type dryers, the range of temperatures at which drying is possible is limited, and there is a problem in that compatibility with various types of laundry is poor.

In a conventional wet-type dryer in which the drying temperature can not be controlled as described above, when the internal temperature of the drying chamber changes due to external factors, there is a problem that it can not be actively counteracted.

For example, even if the temperature of the inside of the drying chamber rises due to exposure of the dryer to the outside in the summer, there is a problem that the conventional dryer does not have a function of maintaining an appropriate temperature, resulting in thermal deformation of the drying object such as agricultural and marine products.

Also, when the internal temperature of the drying chamber is high as described above, even if the inside air passes through the evaporator, there is a problem in that the drying efficiency is lowered due to insufficient cooling to induce condensation.

Korean Patent Publication No. 10-2012-0055260 Korean Patent Publication No. 10-2010-0129532

SUMMARY OF THE INVENTION It is an object of the present invention, which is devised to overcome the above-described problems, to provide a method of continuously drying dehumidified and dried agricultural products in a drying chamber by circulating dehumidified and dried air in a drying chamber,

The stable and uniform supply and circulation of the dehumidified and dried air in each drying chamber can be achieved and uniformly low temperature drying of the agricultural product can be achieved. In particular, after the internal circulation of the drying chamber is completed, the waste heat of the air discharged to the outside is recovered, The present invention provides a cold air drying apparatus for agricultural products which is improved in energy saving efficiency by minimizing the use of energy.

The above object is achieved by the following constitutions provided in the present invention.

According to the present invention, there is provided a cold air drying apparatus for agricultural products,
A drying chamber in which one or more drying chambers for containing the agricultural products requiring drying are formed; An air supply dehumidifier for dehumidifying the supplied air and supplying the dehumidified air into the drying chamber of the drying chamber; A discharge unit for discharging circulated air circulated in the drying chamber formed in the drying chamber through the air supply and dehumidification unit to the outside along the exhaust pipe; And a control unit for controlling the air supply and dehumidifying unit. In the drying chamber, a plurality of drying chambers divided by an upright section wall are aligned in a line, and the section wall and the bottom Layered wall body formed with a supply pipe path communicating therewith, sprayed holes communicating with the supply pipe are formed on the inner wall surfaces of the section wall made of the double-walled wall body, and the dehumidified air supplied through the supply- , Is moved into the respective section walls along the supply line, and is distributed and supplied through the spray holes to the respective drying chambers,
The exhaust pipe line constituting the exhaust unit is disposed so as to pass through the intake pipe for introducing the outside air into the air supply dehumidifying unit and is connected to the outside Air is preheated,
In the exhaust pipe, distribution pipes to be distributed by the manifold are disposed, and a collecting tank filled with the fruit oil is disposed between the manifolds in an alternating manner with the distribution pipe.

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Preferably, the air supply and dehumidification portion includes an intake pipe connecting the atmosphere and the air supply and dehumidification portion; An intake fan for forcibly introducing outside air along the intake pipe to enter the feed chamber; An evaporator for condensing moisture remaining in the outside air by passing the outside air sucked into the air supply chamber along the intake pipe along the surface cooled by the evaporation action of the refrigerant compressed by the compressor; And a condenser that heats the dehumidified air by heat-exchanging the dehumidified air passing through the evaporator with the surface heated by the condensation of the refrigerant, wherein the dehumidified and cooled air passes through the evaporator and is heated An air heater is disposed so that the dehumidified air passing through the evaporator is heated to the set temperature by the heat transferred from the heater.

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As described above, according to the present invention, in the drying chamber, the sectional walls are formed upright to form the respective drying chambers, the respective sectional walls and the bottom are formed into a multi-layered wall, and the dried products, which are supplied along the multi- And the dehumidified air is uniformly supplied, thereby achieving uniform low-temperature drying of agricultural products.

Particularly, in the present invention, after the internal circulation of the drying chamber is completed, the waste heat of the air discharged to the outside is recovered to minimize the use of energy due to the heating of the outside air, so that the energy consumption due to the heating of the dehumidified and dried air is reduced.

According to the temperature and humidity value of the outside air and the circulating air, the control unit actively sets the internal circulation mode and the external air intake mode to dehumidify the air suitable for each situation and dry the agricultural product at a low temperature, Thereby reducing the energy consumption associated with supplying air.

Fig. 1 shows the entire construction of a cold air drying apparatus for agricultural products proposed as a preferred embodiment of the present invention,
FIG. 2 is a use state diagram showing a dried state of agricultural products through a cold air drying apparatus for agricultural products, which is a preferred embodiment of the present invention,
FIGS. 3 to 4 show a detailed operation state of the air supply and dehumidifier in the cold air drying apparatus for agricultural products proposed as a preferred embodiment of the present invention,
5 is a view showing a heat exchange state between an exhaust part and an intake pipe in a cold air drying apparatus for agricultural products proposed as a preferred embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a cold air drying apparatus for agricultural products with improved energy saving efficiency, which has been proposed as a preferred embodiment of the present invention, will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the overall structure of a cold-air drying apparatus for agricultural products proposed in the present invention. FIG. 2 shows a drying state of agricultural products through a cold air drying apparatus for agricultural products, which is a preferred embodiment of the present invention. 3 to 4 show the detailed operation state of the air supply dehumidifying part in the cold air drying apparatus for agricultural products proposed in the preferred embodiment of the present invention, And shows the state of heat exchange between the exhaust part and the intake pipe in the cold air dryer for agricultural products.

As shown in FIGS. 1 and 2, one or more drying chambers 10A and 10B for storing agricultural products, which are required to be dried, are provided in the cold air drying apparatus 1 for agricultural products, A drying chamber 10 in which the drying chamber 10 is formed; (40) for dehumidifying the supplied air and supplying the dehumidified air into the drying chambers (10A, 10B) of the drying chamber (10); A discharge unit 30 for discharging circulated air circulating through the drying chambers 10A and 10B formed in the drying chamber 10 through the air supply and dehumidification unit 40 to the outside along the exhaust pipe path 31; And a controller (50) for controlling the air supply and dehumidifier (40).

In the drying chamber 10, a plurality of drying chambers 10A and 10B divided by the section wall 11 are aligned in a line, and each of the section walls 11 forming the drying chambers 10A and 10B Supporting pieces 11b for catching the trays T containing the agricultural products required to be dried are vertically spaced so that the trays T containing the agricultural products are arranged vertically spaced apart from each other in the drying rooms 10A and 10B do.

The section wall 11 constituted by the multi-layered wall body 11 and the bottom 12 constitute the drying chamber 10, (11a) communicating with the supply pipe passage (13) are formed on each inner wall of the discharge pipe (11).

Therefore, the dehumidified air supplied through the air supply and dehumidification part 40 is moved into each of the section walls 11 along the supply pipe path 13 as shown in FIGS. 2 to 5, And are dispersedly supplied into the drying chambers 10A and 10B.

A return duct 14 is formed in the upper part of the section wall 11 so that the drying chambers 10A and 10B communicate with each other through a return duct 14, Is selectively in communication with the air supply chamber (20) accommodated in the air supply and dehumidification portion (40).

Therefore, the air dehumidified and dried through the air supply dehumidifier 40 is dispersed and supplied into the drying chambers 10A and 10B through the supply pipe path 13 and the spray hole 11a, Dehydrate the agricultural products stored in the tray (T).

The drying chamber 10 is provided at one side of the drying chamber 10 with a feed chamber 20 containing a feed air dehumidifying portion 40 and is connected to the drying chamber 10 through a feed air dehumidifying portion 40 provided in the feed chamber 20. [ And dehumidified and dried air is supplied to each of the drying chambers 10A and 10B,

Here, the air supply dehumidifier 40 includes an air intake path 41 connecting the air to the air supply dehumidifier 40; An intake fan 42 for forcibly drawing outside air along the intake path 41 and flowing into the air supply chamber 20; The external air sucked into the air supply chamber along the intake path (41) is passed along the surface cooled by the evaporating action of the refrigerant compressed by the compressor (47), and the moisture remaining in the external air is condensed and dehumidified An evaporator 43; And a condenser 44 for heating the dehumidified air by exchanging the dehumidified air passing through the evaporator 43 with the surface heated by the condensation of the refrigerant.

In the present embodiment, an electrothermal heater 45 for heating the dehumidified air passing through the evaporator 43 to a predetermined temperature is disposed in the air supply chamber 20.

When the temperature of the set air temperature (30 ° C to 50 ° C) is not maintained even by the heat exchange through the condenser 44 because the temperature of the outside air sucked through the intake path 41 is low, The electrothermal heater 45 is operated so that the dehumidified air distributed and supplied to the respective drying chambers 10A and 10B through the supply pipe path 13 is heated to a set temperature and dispersedly supplied into the respective drying chambers 10A and 10B.

Therefore, the outside air in the air flowing into the air supply chamber 20 along the intake path 41 due to the intake action of the intake fan 42 is dehumidified while passing through the cooled evaporator 43, and the dehumidified air The condenser 44 and the electrothermal heater 45 and then dispersedly supplied into the respective drying chambers 10A and 10B along the supply line 13.

Thus, the agricultural products stored in the drying chambers 10A and 10B are dried at low temperature by circulating the dehumidified air maintaining the set temperature, The air that has been dried in the internal circulation is exhausted to the outside along the exhaust pipe 31 and the exhaust port 32 constituting the exhaust unit 30.

In this embodiment, outside air and air suitable for dehumidification and heating through the air supply and dehumidification section 40 in the air circulated through the drying chamber 10 are alternatively supplied to the air supply and dehumidification section 40, , And 10B are ensured by the dehumidifying and heating of the air supplied to the first, second,

2 to 4, an air intake port 21 formed in the air supply chamber 20 is connected to the drying chamber 10 under the control of the control unit 50 and an intake path 41 The control unit 50 is provided with an external sensor unit 51 for measuring the temperature and humidity of the air in the atmosphere and an external sensor unit 51 for measuring the temperature of the air circulating in the drying chamber 10 And an internal sensor unit 52 for sensing the temperature and the humidity, respectively.

Accordingly, the control unit 50 collates the temperature value and the humidity value of the outside air measured through the external sensor unit 51 with the temperature value of the inside air measured through the internal sensor unit 52 and the humidity value, Lt; / RTI >

The control unit 50 controls the internal air recirculation mode in which the internal air remaining in the drying chamber 10 is re-supplied to the air supply and dehumidifier 40 and re-supplied into the drying chamber 10 according to the calculated deviation value, The air remaining in the drying chamber 10 is exhausted to the outside through the exhaust unit 30 while the outside air is introduced into the drying chamber 10 through the air supply dehumidifier 40, .

Thus, when there is a large amount of humidity in the air in the atmosphere such as the wet season, the control unit 50 does not take in the outside air into which the large amount of humidity is mixed through the suction pipe 41 into the air supply chamber 20, 10) by continuously circulating and dehumidifying the internal air circulated in the inside of the drying chamber 10 by supplying the dehumidified internal air into the drying chamber 10, thereby reducing the operating rate and the operating time of the air supply dehumidifying unit 40, .

The evaporator 43 is passed between the evaporator 43 disposed in the feed chamber 20 and the supply pipe passage 13 of the drying chamber 10 without passing through the condenser 44 or the electrothermal heater 45, If the dehumidified air is not required to be reheated through the condenser 44 or the electrothermal heater 45 by arranging the bypass pipe 48 so that the dehumidified air can be supplied directly into the drying chamber 10, (50) controls the circulating duct (48a) so that the dehumidified air is directly supplied into the drying chamber (10) through the bypass pipe (48).

A heat dissipation damper 49 for supplying outside air to the condenser 44 to radiate heat to the condenser 44 and then discharging the externally discharged air is disposed in the air supply chamber 20, So that stable heat radiation of the condenser (44) is achieved by the external air supplied through the heat dissipation damper (49).

According to this configuration, as the air continuously heated by the heat generated in the condenser 44 is supplied into the drying chamber 10, the phenomenon that the agricultural product dehumidified and dried is deteriorated by the high temperature air can be prevented .

In the present embodiment, the condenser 44 and the electrothermal heater 45 are heated to a predetermined temperature, and then the intake path 41 is closed through the waste heat contained in the air circulated in the drying chambers 10A and 10B Accordingly, the external air supplied to the air supply and dehumidification unit 40 is preheated, thereby shortening the operation rate and the operation time of the electrothermal heater 45, thereby reducing the current consumption by heating the dehumidified air to the set temperature.

In this embodiment, as shown in Figs. 1, 2 and 5, in the present embodiment, in the intake path 41, which is a path through which the outside air is introduced into the air supply chamber 20, The exhaust pipe 31 is disposed so as to pass through the exhaust pipe passage 31 through which the exhaust gas is discharged so that the air remaining in the air discharged to the outside along the exhaust pipe passage 31 after completion of the internal circulation and the outside air flowing along the intake pipe passage 41 So that the outside air supplied into the air supply chamber 20 is preheated by the temperature deviation.

In the present invention, distribution pipes 33 distributed by the manifold 33a are disposed in the exhaust pipe 31 so that the heat radiation area of the circulating air discharged to the outside through the exhaust pipe 31 is divided by the distribution pipe 33 So that more stable heating of the outside air flowing into the air supply chamber along the intake path 41 can be achieved.

That is, in the present invention, the waste heat of the exhaust air discharged through the exhaust pipe 31 after circulating the drying chamber 10 causes the air drawn into the air supply dehumidifying part 40 along the intake path 41 Preheating should be done.

Particularly, in the present embodiment, a collecting tank 33b filled with thermal oil is formed alternately with the distribution pipe 33 between the manifolds 33a so that external air flows along the intake path 41, The air discharged to the outside through each of the distribution pipes 33 heats the fuel oil filled in the collecting tank 33b through the waste heat and then flows into the inlet pipe 41 through the inlet pipe 41, So that the outside air is preheated by the waste heat that is emitted from the collecting tank 33b.

5, even if cold outside air flows into the intake path 41, the pre-heating of the outside air is prevented by the waste heat contained in the exhaust air, The amount of current consumption due to heating the dehumidified air by the air supply dehumidifier 40 to the set temperature can be reduced.

1. Cold air drying device for agricultural products
10. Drying chambers 10A, 10B. Drying room
11. Sectional wall 11a. Spout
11b. Support 12. Floor
13. To the supply pipe 14. Collection space
20. Supply room 21. Intake port
30. Exhaust 31. Exhaust
32. Exhaust port 33. Distribution pipe
33a. Manifold folder 33b. House heat pipe
40. Supply and dehumidification part 41. As intake pipe
42. Intake fan 43. Evaporator
44. Condenser 45. Electric heater
46. Intake duct 47. Compressor
48. Bypass tube 48a. Circular duct
49. Heat damper
50. Control unit 51. External sensor unit
52. Internal sensor unit T. Tape

Claims (3)

A drying chamber in which one or more drying chambers for containing the agricultural products requiring drying are formed; An air supply dehumidifier for dehumidifying the supplied air and supplying the dehumidified air into the drying chamber of the drying chamber; A discharge unit for discharging circulated air circulated in the drying chamber formed in the drying chamber through the air supply and dehumidification unit to the outside along the exhaust pipe; And a controller for controlling the air supply and dehumidifier,
In the drying chamber, a plurality of drying chambers divided by an upright section wall are aligned and formed in a line,
Layer walls constituting the drying chamber, and a discharge hole communicating with the supply pipe is formed on each inner wall surface of the partition wall composed of the multi-walled wall,
The dehumidified air supplied through the air supply dehumidifying unit is moved into each of the sectional walls along the supply pipe path and is dispersed and supplied into each drying chamber through the spray hole,
The exhaust pipe that constitutes the exhaust unit includes an exhaust pipe that is disposed so as to pass through an intake pipe for introducing outside air into the air supply dehumidifying unit and is supplied to the air supply dehumidifying unit along the intake pipe by waste heat of air discharged along the exhaust pipe. Air is preheated,
The exhaust pipe is provided with distribution pipes to be distributed by the manifold,
Wherein the heat collecting tank filled with the fruit oil is disposed between the manifolds so as to be alternated with the distribution pipe, wherein the energy saving efficiency is improved. The air conditioner according to claim 1, wherein the air supply dehumidifier comprises: an intake duct connecting the atmosphere and the air supply and dehumidifier; An intake fan for forcibly introducing outside air along the intake pipe to enter the feed chamber; An evaporator for condensing moisture remaining in the outside air by passing the outside air sucked into the air supply chamber along the intake pipe along the surface cooled by the evaporation action of the refrigerant compressed by the compressor; And a condenser for heating the dehumidified air by exchanging heat between the dehumidified air passing through the evaporator and the surface heated by the condensation of the refrigerant,
Wherein an air heater is disposed in the air supply chamber to heat dehumidified and cooled air while passing through an evaporator and the dehumidified air passing through the evaporator is heated to a predetermined temperature by heat transfer from the electric heater. This improved cold air dryer for agricultural products.

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