JP2011220661A - Heat recovery type drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat recovery type drying device which can save energy by installing an heat recovery heat exchange device, in a drying device for drying dried objects such as farm and marine products.SOLUTION: The air is supplied through the heat recovery heat exchange device 100 with respect to each fixed area, and the air supplied through the heat recovery heat exchange device 100 is passed through a heating means 30 by an air supply fan 20, and dries the object while passed through a drying chamber 10. Further, the air repeatedly dries the object while passed through the drying chamber by the air supply fan in a next place, then circulated in the fixed area, and discharged to the external through the heat recovery heat exchange device 100.

Description

According to the present invention, in a drying apparatus for drying an object to be dried such as agricultural and marine products, an exhaust heat recovery heat exchange device is installed so that heat exchange between exhaust air and supply air is performed. The present invention relates to a waste heat recovery type drying apparatus in which air is recirculated until drying reaches a certain humidity so that drying is performed.

A generally known conventional drying apparatus for drying agricultural and marine products is known from Korean Patent No. 10-0492033.

As shown in FIG. 1, the technical configuration is that a part of the high-temperature and high-humidity air used for drying discharged from the exhaust port (12) of the drying chamber (10) is an exhaust fan (22). Is discharged through the exhaust heat recovery heat exchanger (100).
The outside air (OA) passes through the exhaust heat recovery heat exchange device (100) by the suction of the air supply fan (21), recovers the heat of the exhaust (EA), and is then supplied to the drying device.
The air supplied to the drying device by the exhaust heat recovery heat exchange device (100) is sucked into the air supply port (11) of the drying chamber (10) by the air supply fan (20). The supply air (SA) sucked by the supply air fan (20) is heated to a certain temperature by the heating means (30) and then uniformly distributed inside the drying chamber (10) through the air distribution vane (40). The to-be-dried material supplied and dried on the conveyor (50) is dried and discharged from the exhaust port (12).

At this time, most of the high-temperature, high-humidity air used for drying the material to be dried discharged from the exhaust port (12) of the drying chamber (10) is supplied to the drying chamber (10) as ventilation (RA). It is re-inhaled into the mouth (11) and supplied into the drying chamber (10) to circulate.

On the other hand, the present applicant has already applied for a waste heat recovery type agricultural and marine product drying apparatus and has been registered as Korean Patent Registration No. 10-0926703.

As shown in FIG. 2, the exhaust heat recovery heat exchange is performed by using all the high-temperature and high-humidity air used for drying discharged from the exhaust port (12) of the drying chamber (10) as exhaust (EA) as shown in FIG. This is a 100% air supply / exhaust type drying device that passes exhaust heat to the air supply (SA) while exhausting it to the outside through the device (100).

With regard to such a waste heat recovery type agricultural and marine product drying apparatus, the method proposed in FIG. 2 described above can slightly adjust the humidity of the dry air according to the amount of air supplied and exhausted while recovering the exhaust heat. However, since the amount of air supplied and exhausted is limited, there is a limit to greatly reducing the humidity. In the method shown in FIG. 2 described above, 100% of the outside air from which exhaust heat has been recovered is exhausted by substantially one circulation inside the drying apparatus, so that the time used for drying is very long. There is an uneconomic problem of not fully utilizing short, low-humidity dry air.

The present invention has been devised in order to improve the above-mentioned drawbacks and problems, and its purpose is that it cannot effectively reduce the humidity of the dry air that a conventional drying apparatus has, and The all-outdoor air supply method for exhaust heat recovery solves the problem that dry air with low humidity is not fully utilized. In a waste heat recovery type drying device, exhaust heat from the exhaust is recovered and the low-humidity dry air that is supplied is recirculated into the drying chamber multiple times by an air supply fan and used for drying until a certain humidity is reached. Thus, exhaust heat recovery supply / exhaust is performed.
The exhaust heat recovery supply / exhaust is intermittently performed to provide an exhaust heat recovery type drying apparatus that fully utilizes dry air with low humidity.

In addition, the present invention supplies air supply to the inside of a drying chamber in which the objects to be dried are stacked or moved on a conveyor or the like in the side direction of the drying apparatus, and exhaust heat recovery heat exchange apparatus for each predetermined region Through the air supply and exhaust. The supply air supplied through the exhaust heat recovery heat exchange device passes through the drying chamber after passing through the heating means by the supply air fan, dried, and repeatedly while passing through the drying chamber by the supply air fan in the next place. After circulating a certain area in the drying method, it is discharged to the outside through the exhaust heat recovery heat exchanger. This type of drying system consists of several zones divided into certain areas along the length of the drying chamber, and is a waste heat recovery system that can quickly dry without losing energy. Providing equipment.

In other words, according to the present invention, the drying chamber of the drying apparatus is divided into several zones so that the drying is performed. In one zone, the air used for the drying is circulated inside the drying chamber again for drying. After drying is performed until sufficient moisture is achieved by the method used, exhaust heat is passed to the supply air while being discharged to the outside through the exhaust heat recovery heat exchange device to save energy.

As a technical means for achieving the above object, according to the present invention, in a drying apparatus for drying an object to be dried, one drying chamber is divided into a plurality of zones, and each zone has a discharge. Each heat recovery heat exchanger is installed.

The supply air (SA) subjected to heat exchange by each of the exhaust heat recovery heat exchangers is supplied to an air supply fan connected to the drying chamber.

The air sucked and supplied by the air supply fan is heated by the heating means, and then the material to be dried in the drying chamber is dried and supplied again to the adjacent air supply fan.

The air supplied to the air supply fan is circulated and supplied to the final air supply fan in the same manner as described above, dried, and then exhausted through each exhaust heat recovery heat exchanger. An exhaust heat recovery type drying device is provided.

In the present invention, the drying zone in which the one exhaust heat recovery heat exchange device is installed is an area connected to the drying chamber. Air supply fans are installed, each of the air supply fans supplies air to the drying chamber, and ventilation (RA) discharged from the exhaust port of the drying chamber is supplied to the air supply port of the adjacent air supply fan. It is characterized by circulating.

Further, the present invention provides a drying chamber that is installed in a single stage or a multistage, and moves while drying the object to be dried. An apparatus is installed and drying is performed for each zone.

Further, in the present invention, in order to directly heat the object to be dried in the drying chamber, the microwave generated by the magnetron is supplied to the inside of the drying chamber through the waveguide so that the object to be dried is heated. It is characterized by

In addition, the present invention is characterized in that the cooling air that has cooled the interior of the magnetron is exhausted through an exhaust heat recovery heat exchange device together with ventilation (RA) exhausted from the drying chamber.

Further, according to the present invention, in the drying chamber, a blocking plate that blocks air flow in a direction in which the conveyor moves is installed on the upper and lower sides of the conveyor, and the blocking plate moves the object to be dried and the movement of the conveyor. It is characterized in that it is set apart so as not to cause any obstacles.

Further, the present invention provides an exhaust port of a drying chamber for discharging air that has been dried by an air supply fan for each of the above zones, and an air supply port of a next air supply fan adjacent to the air supply fan. It is characterized by installing a ventilation flow passage connecting the two.

Further, the present invention is characterized in that an air supply flow passage to which each air supply fan in each of the zones, each heating means, and each drying chamber is connected is installed.

In addition, the present invention circulates through the drying chamber repeatedly if the humidity of the ventilation exhausted from the drying chamber is below a certain value, and ventilates through the exhaust heat recovery heat exchanger when the humidity of the ventilation exceeds a certain level. While a part of the air is discharged to the outside, the supply air is supplied at the same time.
The supply air is mixed with ventilation, and drying is performed while circulating in the drying chamber.

In the drying apparatus for drying an object to be dried by the exhaust heat recovery type drying apparatus of the present invention, the drying chamber is divided into several zones and the drying air is circulated through the drying chamber several times for each zone. After repeating the drying process until the humidity in the air rises to some extent, exhaust heat is passed through the supply air while exhausting it through the exhaust heat recovery heat exchanger.
Once the air used for drying is heated without being discharged to the outside, it is used again for drying, so that the moisture content in the air exceeds a certain level, and then externally passed through the exhaust heat recovery heat exchanger. Discharge.
Drying efficiency is achieved so that optimum drying according to the drying state of the material to be dried is performed by performing drying by the above method for each zone divided according to the length direction of the drying chamber. On the other hand, there is an excellent effect that energy can be saved by exhaust heat recovery.

Explanatory drawing of the air flow of the drying apparatus with the existing heat recovery heat exchanger. Explanatory drawing of the air flow of the drying apparatus with the existing heat recovery heat exchanger. Explanatory drawing which shows the flow of the air in the case of the recirculation in the drying apparatus with an exhaust heat recovery heat exchanger of this invention, and the case of exhaust heat recovery supply / exhaust. Explanatory drawing which shows the flow of the air in the case of exhaust heat recovery supply / exhaust in the drying apparatus with an exhaust heat recovery heat exchange apparatus of this invention. Explanatory drawing of the drying apparatus Example of a waste heat recovery system of this invention. The sectional side view which shows the Example of the dry air flow in the drying apparatus of the exhaust heat recovery system by this invention. FIG. 7 is a plan sectional view of the exhaust heat recovery type drying apparatus according to FIG. 6. The perspective view of the Example which comprises the multistage type ventilation flow path and supply air flow path of this invention. Explanatory drawing of the air flow by this invention. The perspective view and side sectional view of a ventilation flow passage by other examples of the present invention. FIG. 6 is a perspective view of a ventilation flow passage according to another embodiment of the present invention. FIG. 12 is a plan structural view of a ventilation flow passage according to FIG. 11. The perspective view of the ventilation flow path and supply air flow path by another Example of this invention. Explanatory drawing of the drying apparatus Example of the waste heat recovery system by another Example of this invention. Explanatory drawing of the drying apparatus of the waste heat recovery system by another Example of this invention. FIG. 16 is a side sectional view and a plan sectional view of the exhaust heat recovery type drying apparatus according to FIG. 15. FIG. 16 is a side sectional view and a plan sectional view of the exhaust heat recovery type drying apparatus according to FIG. 15.

The present invention uses the air used for drying in a drying apparatus that dries seaweed, agricultural and marine products, industrial products, etc. as necessary until drying reaches a certain humidity, and then exhausts heat recovery heat exchange. It is discharged outside through the device.

That is, according to the present invention, in the exhaust heat recovery type drying apparatus, the low-humidity supply air (dry air) supplied by acquiring exhaust heat from the exhaust gas is re-applied to the inside of the drying chamber many times by the supply air fan. It is circulated and used to dry until it reaches a certain humidity, and then exhaust heat is provided to the supply air while exhausting. By making exhaust heat recovery supply / exhaust intermittently, the air used for drying is fully utilized. It is divided into a plurality of zones in the length direction of the drying chamber, and air supply and exhaust are performed through the exhaust heat recovery heat exchanger for each zone.

In addition, the present invention provides that the supply air that is recovered and supplied from the exhaust gas through the exhaust heat recovery heat exchanger installed in each zone is used for drying in the drying chamber, and then recirculated and dried. The process to be performed is repeated until the moisture content in the air reaches a certain amount and then discharged.

In the present invention, a plurality of air supply fans are installed on the side of the drying device so that air is supplied to the drying chamber, and the drying chamber is divided into zones having a certain number of spaces. Then, using a plurality of air supply fans installed in each zone, the air is repeatedly circulated and exhausted after it is sufficiently utilized for drying. At this time, exhaust heat recovery air supply is performed at the same time, and exhaust heat recovery air supply / exhaust is performed intermittently, while high humidity air in the drying chamber is sufficiently exhausted outside during supply / exhaust. To.

In another example, the air supplied from the first supply fan and dried in the drying chamber is re-supplied by the second supply fan and circulated in the drying chamber. The air that has been supplied with air by the second air supply fan and finished drying is recycled in a zone that allows it to be recycled by the third air supply fan. In one zone, the supply air supplied by the first supply air fan is exhausted by the last supply air fan in the zone in the exhaust heat recovery heat exchanger so that drying is performed while circulating. It is made to supply continuously after exchanging heat.

The drying method is independently performed in each zone in which the drying chamber is divided into a plurality of sections.

That is, in the present invention, one drying device is divided into a plurality of zones, and an exhaust heat recovery heat exchange device is installed for each zone. In each zone, the drying efficiency is improved by using the low-humidity air supplied from outside by allowing the drying air to circulate inside the drying chamber by a plurality of air supply fans. On the other hand, by recovering exhaust heat, the energy required for drying can be reduced.

In the present invention, outside air (OA) is outside air, and supply air (SA) is air supplied to the drying chamber (10) through the exhaust heat recovery heat exchanger (100), exhaust (EA: Exhaust Air) is exhausted from the drying chamber (10) after being dried and exhausted to the outside through the exhaust heat recovery heat exchanger (100), and ventilation (RA) is exhausted from the drying chamber (10). Air that is re-supplied to the drying chamber (10) or air that passes through the exhaust heat recovery heat exchanger (100).

Such an embodiment of the present invention will be described below with reference to the accompanying drawings.

In the present invention, after exhausting indoor air and supplying outside air through an exhaust heat recovery heat exchanger (100) as shown in FIG. 3, low humidity air (SA) supplied to the inside of the drying apparatus is supplied. The inside of the drying chamber (10) is supplied by a fan (20). The dry air (RA) discharged through the exhaust port (12) of the drying chamber (10) is supplied to the inside of the drying chamber (10) again by the air supply fan (20), and the drying air is brought to a constant humidity. Repeat until it reaches. When the circulating dry air (RA) reaches a certain humidity, the humidity inside the drying device is high by the supply / exhaust fans (21, 22) installed on the supply / exhaust side of the exhaust heat recovery heat exchange device (100). While the dry air is sufficiently discharged, the external low-humidity air (SA) is supplied to the inside of the drying device, and supplied to the inside of the drying chamber (10) by the air supply fan (20) for drying. It is mixed with high-humidity ventilation (RA) discharged from the chamber (10) through the exhaust port (12) and supplied again to the drying chamber (10) by the air supply fan (20).

At the time of such exhaust heat recovery supply / exhaust, the air (RA) in the high-humidity drying device already used for drying and the low-humidity supply air (SA) supplied from the outside are mixed, and the drying chamber (10 ) Is circulated for a certain period of time, a low humidity air state is formed inside the drying chamber (10).

The exhaust heat recovery supply / exhaust is intermittently executed. When the humidity of the air in the drying apparatus becomes low below a certain level, the exhaust heat recovery supply / exhaust is interrupted, and the air in the drying apparatus is removed from the drying chamber ( By continuously recirculating the inside of 10), the externally supplied air (SA) having a low humidity and recovering the exhaust heat from the exhaust (EA) can be sufficiently utilized economically for drying.

Also, as shown in FIG. 4, when operating an independent drying chamber (10) such as a chamber and a room, the cooling dehumidifier (70) and the exhaust heat recovery heat exchange device (100) are provided separately. After the air supply (SA) passes through the air supply fan (20) and the heating means (30), it passes through the drying chamber (10) in which a drying table (75) is placed in a chamber or room form. The air discharged from the drying chamber (10) is re-supplied to the drying chamber (10) as ventilation (RA) through the damper (80) or exhausted (EA) through the exhaust heat recovery heat exchange device (10). Discharged to the outside.

That is, the dry air (RA) discharged after the low-humidity air (SA) is supplied to the drying chamber (10) and dried is selected by the two-way damper (80) and supplied to the air supply fan ( 20), the process of being supplied again into the drying chamber (10) is repeated until the dry air reaches a certain humidity.
When the dry air circulated inside the drying chamber (10) reaches a certain humidity, it is discharged by the exhaust fan (22) through the exhaust heat recovery heat exchange device (100), and the external low-temperature air being supplied is cooled. After exhaust heat is added to the air (OA) to increase the temperature of the supply air, the air is supplied to the drying chamber (10).

By performing such exhaust heat recovery supply / exhaust intermittently, if the humidity of the air in the drying device falls below a certain level, the exhaust heat recovery supply / exhaust is interrupted and the air from the inside of the drying device is removed to the drying chamber. By continuously recirculating the inside of (10), the externally supplied air (SA) having a low humidity and recovering the exhaust heat from the exhaust (EA) can be utilized sufficiently efficiently for drying.

In addition, in the present invention, a conveyor (50) having a considerable length is installed inside the drying chamber (10), and the objects to be dried placed on the conveyor (50) are dried for each zone. Partition multiple zones.

In each zone, an air supply fan (1-N) (2-N) for supplying air supply (SA) to the side of the conveyor (50) is subsequently installed, and the air supply fan (1- N) (2-N) supplied air (SA) is heated by the heating means (30), and then discharged through the conveyor (50). After passing through the air supply fan (1-N) (2-N) without exhausting the air once passing through the drying chamber (10) as exhaust (EA), the circulation process is performed several times. Then, it is discharged outside through the exhaust heat recovery heat exchange device (100) (101).

That is, according to the present invention, the air supply (SA) that has passed through the exhaust heat recovery heat exchange device (100) is an air supply fan (1-1) when viewed in one zone based on FIG. ), The material to be dried mounted on the conveyor (50) is dried, and the humidity is increased and the temperature is slightly lowered, and the product is discharged from the drying chamber (10). Next, the material to be dried is again dried while being sucked by the air supply fan (1-2) and heated again by the heating means (30) and passing through the conveyor (50) at a constant temperature. As a result, the moisture content in the air rises and the drying proceeds again while being sucked and circulated by the air supply fan (1-3). In this way, the air that has passed through the last air supply fan (1-N) contains moisture generated when the object to be dried is dried, and is finally discharged in a high humidity state. .

In this way, the exhaust (EA) that has passed through the air supply fan (1-N) is heated by transferring heat to the outside air (OA) supplied by the exhaust heat recovery heat exchange device (100), and the temperature is increased. The supply air (SA) with low humidity is continuously supplied by the supply fan (1-1).

The air supplied as the supply air (SA) in the exhaust heat recovery heat exchange device (101) installed in another zone is heated by the supply air fan (2-1) through the heating means (30). Becomes higher, dries the object to be dried on the conveyor (50), the humidity is increased, the temperature is lowered slightly, and again after passing through the drying chamber (10) by the air supply fan (2-2). Drying is repeatedly performed while sucking and circulating with the air supply fan (2-3).

By such a method, the exhaust gas (EA) that has passed through the last air supply fan (2-N) becomes air in a high humidity state. Exhaust air (EA) that has passed through the air supply fan (2-N) is exhausted heat recovery heat exchange device (101), and heat is transferred to outside air (OA) supplied from outside, so that the temperature is increased and humidity is reduced. A low supply air (SA) is continuously supplied by the supply air fan (2-1).

In the present invention, in the exhaust heat recovery heat exchange device (100), the exhaust (EA) discharged after being dried by the air supply fan (1-N) is heat-exchanged with the outside air (OA), and the outside air is exhausted. The air supply (SA) having a considerably higher temperature and a lower relative humidity is supplied to the drying chamber (10).

Further, the exhaust heat recovery heat exchange device (101) of the present invention allows the exhaust (EA) discharged after being dried by the air supply fan (2-N) to transfer heat to the outside air (OA). The supply air (SA) having a higher temperature and lower humidity than the outside air can be supplied to the drying chamber (10).
Therefore, for each zone, heat exchange is performed between the supply air (SA) and the exhaust gas (EA) from the respective exhaust heat recovery heat exchange devices (100) (101).

In the present invention, after the air supplied by the air supply fan (1-1) is dried, the air is not discharged to the outside, and is supplied to the next air supply fan (1-2) to be dried. To be done. The air that has been dried by the air supply fan (1-2) flows into the next air supply fan (1-3) again, and the drying proceeds. Air is supplied by the air supply fans (1-1 to 1-N).

In the exhaust heat recovery heat exchanger (100) of the present invention, the air dried by the last air supply fan (1-N) is exhausted as exhaust (EA), and is supplied to outside air (OA) supplied from the outside. The exhaust heat is transferred so that the supply air (SA) having a high temperature and a low humidity is supplied to the first supply fan (1-1).

Supplying, circulating, drying, and exhausting the exhaust heat recovery supply air in such a manner is set for each predetermined region of the drying chamber (10) and is performed for each zone.

On the other hand, in the present invention, heating means (30) for heating air is installed at the lower part of all the air supply fans (1-1) to (2-N) by using an electric heater, a burner or the like, The supply air (SA) sucked and supplied to the air fans (1-1) to (2-N) is raised to a certain temperature, and the object to be dried is dried while circulating inside the drying chamber (10). To do.

In the present invention, when the dry air is circulated by the supply fans (1-1) to (2-N) in the conveyor (50) moving in the drying chamber (10), the dry air is possible. As shown in FIGS. 5 and 6, a blocking plate (51) is installed on the upper and lower sides of the conveyor (50) so that it does not flow to other adjacent spaces as much as possible.

The blocking plates (51) are installed at the upper and lower portions of the conveyor (50) so as not to interfere with the movement of the conveyor (50) and the movement of the object to be dried. This is to prevent air from moving as much as possible in the direction in which the conveyor (50) moves. Finally, the blocking plate (51) is formed in the transverse direction of 90 ° and 270 ° from the direction in which the conveyor (50) moves, and the traveling direction of the conveyor (50) or the length direction of the conveyor (50). By shutting off the air that moves to the inside, the inside of the drying chamber (10) can be partitioned into areas corresponding to the respective air supply fans (1-1) to (1-N).

On the other hand, Table 1 below shows a substantial amount of air according to the embodiment of the present invention, and Table 2 shows a comparison table comparing the substantial amount of air, the amount of evaporated water, and the enthalpy according to the prior art and the present invention. The distinguishing feature of the invention can be confirmed.

[Table 1]

SA: Air supply after recovering 80% exhaust heat

SA (1): Air supply after heating

[Table 2]

That is, as shown in Table 1 above, in the laver drying process, if the heat exchange is 80% between OA 5 ° C. and RA 40 ° C., SA becomes 33 ° C. and is discharged outside. The resulting EA will be 12 ° C. As for the relative humidity, 30% of OA is heated by exhaust heat recovery, and SA is lowered to 5%. When SA is heated to 45 ° C., which is suitable for drying nori, the relative humidity becomes 3% or less, and an air condition that is very advantageous for drying can be created.

In addition, as shown in Table 2, ventilation (RA) conditions (temperature 40 ° C.) after drying of nori
Under the condition that the relative humidity is 60% and the absolute humidity is 30 g / kg (DA), the amount of water evaporated on the drying process is 3 and 28 g / kg (DA). 9 times higher than technology. Comparing the required calories, in the present invention, the required calorie in the first heating means is 0.8 kcal / kg (DA) as 2.9 kcal / kg (DA) which is more than the conventional 2.1. In many cases, it is as low as 1.2 kcal / kg (DA) in the process of recirculation in the drying chamber.
For this reason, in the prior art, when the ventilation volume is 10% and the ventilation frequency is 10 times, the total required calorie is 2.1 * 10 times = 21 kcal / kg (DA). Assuming 2.9 kcal / kg (DA) and 9 internal circulations, 1.2 * 9 = 10.8 kcal / kg (DA), so the total is 13.7 kcal / kg (DA), compared to the conventional technology. About 35% reduction effect.

In the present invention, a single exhaust heat recovery heat exchange device (100) is configured in one zone equipped in the drying chamber (10). As shown in FIG. 8 and FIG. 9, a plurality of multi-stages are installed in the vertical direction, and an appropriate number of air supply fans constituting each zone is installed according to the drying conditions of the object to be dried.

In the present invention, the upper part of the conveyor (50) is installed in the drying chamber (10), and in each zone, in order to smooth the flow of the dry air sucked, circulated and discharged by the air supply fan (20). As shown in FIGS. 10 to 13 at the upper and side portions of the blocking plate (51) and the drying chamber (10) at the lower and lower portions, separate ventilation flow passages (10a) and air supply flow passages having a duct function (10b) is installed.

Further, the configurations and shapes of the ventilation flow passage (10a) and the supply air flow passage (10b) are shown in FIGS. 8 and 10 to 13, depending on the installation location of the circulating air supply fan (20) for the dry air in the drying device. As shown in Fig. 4, the shape is not linear, but can be formed in various shapes having distorted shapes and angles.

In addition to this, FIG. 14 is an explanatory diagram of an embodiment of the drying device for exhaust heat recovery system for all outside air according to the present invention, in the drying device for exhaust heat recovery exhaust system for 100% all outside air according to the present invention. When the air volume of the supply air (SA) and the exhaust gas (EA) is excessive, the size of the exhaust heat recovery device (100) (101) is increased, and thereby the exhaust heat recovery device (100) (100) ( 101) becomes difficult to install on the site, and economical problems such as installation costs occur. Therefore, as shown in FIG. 14, the last air supply fan (1-N) of the drying apparatus is used. ) (2-N) passes a part of the ventilation (RA) exhausted from the drying chamber (10) through the exhaust heat recovery device (100) (101) by operating the two-way air volume adjustment damper (81). Without being joined to the supply fan (1-1) (2-1) on the supply (SA) side Unisuru.

In such a case, since a part of the ventilation (RA) after drying is supplied to the supply air (SA) side, the humidity of the supply air (SA) supplied to the first supply fan in each zone However, the drying efficiency is lowered, but the air volume of the supply air (SA) and the exhaust air volume (EA) in the exhaust heat recovery device (100) can be reduced, and the size of the exhaust heat recovery device (100) is reduced. can do. Thereby, the installation in the field can be made easy.

On the other hand, the present invention uses heating means (30) such as a heater when heating the supply air (SA) supplied from the exhaust heat recovery heat exchanger (100) as shown in FIGS. At the same time, the present invention can also be applied to a composite drying apparatus that directly irradiates a microwave to heat an object to be dried and is used for drying. In addition to the heating means (30), a magnetron (60) and a waveguide are used. The microwave generated from the magnetron (60) by installing the tube (61) is supplied to the drying chamber (10) through the waveguide (61), so that the material to be dried in the drying chamber (10) becomes microscopic. Heated directly by the waves to allow for rapid drying.

The circulation of the air in the drying chamber (10) of the present invention is the same as that described in the above embodiment, except that the object to be dried is directly heated using a microwave, so that the magnetron A power source for driving (60) is required, and it is safe to have a shut-off unit or the like that cuts off microwaves inside the drying chamber (10).

Therefore, in the present invention, since heat is generated from the inside when the magnetron (60) is driven, cooling by air is necessary, and for cooling the magnetron (60), the cooling is supplied to the inside of the magnetron (60). Air is exhausted through the exhaust heat recovery heat exchanger (100) together with the ventilation (RA) exhausted from the drying chamber (10), thereby recovering the exhaust heat from the magnetron (60) and utilizing it for drying. Can save energy.

10: Drying chamber 10a: Ventilation flow passage 10b: Supply air flow passage 11: Supply air port 12: Exhaust port 1-N, 2-N, 20: Supply air fan 30: Heating means 40: Vane
50: Conveyor 51: Shut-off plate 60: Magnetron 61: Waveguide 70: Cooling dehumidifier 75: Drying table 80: Two-way damper 81: Two-way air volume adjustment damper 100, 101: Waste heat recovery heat exchanger

Claims (10)

In a drying apparatus for drying an object to be dried, one drying chamber (10) is constituted by a plurality of zones, and in each zone, an exhaust heat recovery heat exchange device (100) (101) is installed,
The supply air (SA) heat-exchanged in each of the exhaust heat recovery heat exchange devices (100) (101) is connected to the drying chamber (10), and is supplied to an air supply fan (1-1) ( 2-1), and the air sucked and supplied by the air supply fans (1-1) and (2-1) is heated by the heating means (30), and then the inside of the drying chamber (10). Is dried by the adjacent supply fan (1-2) (2-2) and supplied to the supply fan (1-2) (2-2). After the air is circulated and supplied to the air supply fans (1-N) (2-N) in the above-described manner and dried, the air passes through the exhaust heat recovery heat exchangers (100) (101). An exhaust heat recovery type drying apparatus characterized by being discharged. In Claim 1, the zone which is a drying area in which said one waste heat recovery heat exchange device (100) is installed has a plurality of air supply fans (1-1) to the drying chamber (10). (1-N) is installed, and each of the air supply fans (1-1) to (1-N) supplies the air supply to the drying chamber (10), and the exhaust port (12) of the drying chamber (10). ) Is exhausted to the air supply port (11) of the air supply fan at the subsequent stage, and the exhaust heat recovery type drying device. 2. The zone according to claim 1, wherein the conveyor (50) of the drying chamber (10) is installed in a single stage or a multi-stage and moves to dry an object to be dried, and is divided by a certain area of the conveyor (50). , A waste heat recovery type drying apparatus, wherein an exhaust heat recovery heat exchange device is installed and drying is performed for each zone. The microwave generated in the magnetron (60) is supplied to the inside of the drying chamber (10) through the waveguide (61) to directly heat the object to be dried in the drying chamber (10). Then, the drying apparatus of the exhaust heat recovery method is characterized in that the object to be dried is heated. In Claim 4, the cooling air which cooled the inside of the said magnetron (60) is discharged | emitted through a waste heat recovery heat exchanger (100) with ventilation (RA) discharged | emitted from a drying chamber (10). An exhaust heat recovery type drying device characterized by In Claim 3 or Claim 4, in the drying chamber (10), a blocking plate (51) for blocking the flow of air in the direction in which the conveyor (50) moves is installed on the upper part and the lower part of the conveyor (50). The waste heat recovery type drying apparatus is characterized in that the blocking plate (51) is installed away from the conveyor (50) so as not to obstruct the movement of the object to be dried and the movement of the conveyor (50). . In Claim 1 thru | or 4, The exhaust port (12) of the drying chamber (10) from which the air dried with the air supply fan (1-1) in each said zone is discharged | emitted; An exhaust heat recovery type drying apparatus comprising a ventilation flow passage (10a) for connecting an air supply port (11) of an air supply fan (1-2) immediately adjacent to the air fan (1-1). In Claim 1 thru | or 4, the air supply flow path (10b) which connects each air supply fan in each said zone, each heating means (30), and each drying chamber (10) is installed. An exhaust heat recovery type drying apparatus characterized by: In Claim 1 thru | or 4, a part of ventilation (RA) discharged | emitted from a drying chamber (10) with the said air supply fan operates a two-way air volume adjustment damper (81), and is a waste heat recovery apparatus ( 100) A drying apparatus of an exhaust heat recovery method, wherein the drying apparatus is configured to join the supply air (SA) side without passing through 100). When the humidity of the ventilation (RA) discharged from the drying chamber (10) is below a certain value in claim 1 to claim 4, the ventilation (RA) is repeatedly circulated in the drying chamber (10). When the humidity of the ventilation (RA) exceeds a certain value, a part of the ventilation (RA) is exhausted to the outside through the exhaust heat recovery heat exchange device (100), and at the same time, the supply of air (SA) is performed to The exhaust heat recovery type drying apparatus is characterized in that the air supply (SA) and ventilation (RA) are mixed, and drying is performed while circulating inside the drying chamber (10).

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