WO2009153842A1

WO2009153842A1 - Drying apparatus

Info

Publication number: WO2009153842A1
Application number: PCT/JP2008/001605
Authority: WO
Inventors: 柴田勝美
Original assignee: Shibata Katsumi
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2009-12-23

Abstract

A drying apparatus that suppresses any heat release to the outside of system and avoids any odor emission. The drying apparatus comprises a rotary kiln (2) as a drying chamber for object to be processed; a refrigerating machine equipped with an evaporator and a condenser connected to each other through a refrigerant circulation channel; an air conditioning chamber (3) equipped thereinside with an evaporator and a condenser and provided with a moisture absorbent interposed between the evaporator and the condenser so that air to be conditioned is brought into contact with the evaporator, moisture absorbent and condenser in this sequence; and pipes (4a,4b) as an air circulation channel for circulation of air between the rotary kiln (2) and the air conditioning chamber (3), wherein the evaporators and the condensers are disposed in a closed circuit composed of the rotary kiln (2), the air conditioning chamber (3) and the pipes (4a,4b). Accordingly, both the heat of evaporation and heat of condensation of the refrigerant can be effectively utilized by suppressing any release thereof to the outside of system. Further, the air within the rotary kiln (2) stays within the closed circuit and is not discharged to the outside of system to thereby avoiding any odor emission.

Description

Drying equipment

The present invention relates to a drying apparatus for drying an object to be processed containing a liquid.

When drying an object containing liquid, drying with a drying furnace or hot air drying apparatus releases high-temperature exhaust gas to the atmosphere, which causes problems such as wasteful energy consumption, air pollution, and global warming. In addition, drying with a vacuum drying apparatus has problems such as high initial cost, poor operability, and difficulty in uniform heat transfer.

Therefore, conventionally, drying is performed under reduced pressure (see Patent Document 1), moisture is condensed by an evaporator of a compression refrigeration cycle, and low-humidity air after moisture condensation is reheated by a condenser (Patent Document). 2), control by dividing the condenser into a condenser for adjusting heat that releases heat out of the system and a condenser for heating that generates moist air by evaporating the water in the object to be dried The method of making it easy to do and raising efficiency (refer patent document 3) is tried.

Japanese Patent Laid-Open No. 11-63818 Japanese Patent Laid-Open No. 11-197395 JP 2004-301696 A

However, in any of the above methods, drying can be performed by any method, but there are problems such as poor heat transfer efficiency and wasteful release of heat from the system.
Accordingly, an object of the present invention is to provide a drying apparatus that suppresses heat radiation outside the system and prevents the generation of odor.

The drying apparatus of the present invention includes a drying chamber for an object to be processed, a refrigerator having an evaporator and a condenser connected by a refrigerant circuit, an evaporator and a condenser disposed therein, and the evaporator and the condenser. A hygroscopic agent is disposed between the air conditioning chamber in which the air to be conditioned is brought into contact with the evaporator, the hygroscopic agent, and the condenser, and an air circulation path through which air is circulated between the drying chamber and the air conditioning chamber. It is provided.

According to the drying apparatus of the present invention, when the air in the drying chamber is circulated through the air circulation path, the conditioned air (humid air) containing moisture is cooled and condensed by the evaporator's heat of vaporization in the air conditioning chamber ( The moisture in the humid air is separated and removed, the moisture in the air is absorbed and removed by the moisture absorbent, and the moisture is removed by the condensation heat of the refrigerant by the condenser. Heat. Then, moisture is removed from the object to be processed in the drying chamber by the heated low humidity conditioned air, and the object to be processed is dried.

Further, in the drying apparatus of the present invention, the hygroscopic agent is a granular body filled in a rotating container or a rotary body molded in a honeycomb shape, and further, the rotational area of the hygroscopic agent with respect to the flow direction of the conditioned air. It is desirable to have a configuration provided with a heater disposed at a part of the rear of the air and a blower that blows air heated by the heater toward a part of the moisture absorbent. Thus, when the hygroscopic agent rotates, it contacts the air to be conditioned and absorbs moisture in the air, and is heated by the heater when it reaches a position where the air heated by the heater is blown. The air that is blown by the blower contacts the hygroscopic agent that has absorbed moisture in the conditioned air, absorbs the moisture absorbed by the hygroscopic agent, and the front of the container with respect to the flow direction of the conditioned air Sent to. Here, since an evaporator is disposed in front of the hygroscopic agent, the air that has absorbed the moisture of the hygroscopic agent is cooled and condensed to remove the moisture. That is, the hygroscopic agent that has absorbed moisture in the conditioned air is dried and regenerated while the hygroscopic agent rotates, and is repeatedly used to absorb moisture in the conditioned air.

In addition, it is desirable that the hygroscopic agent rotates around an axis in the flow direction of the conditioned air. This makes it possible to repeatedly use the moisture-absorbing air for moisture absorption while only revolving the moisture-absorbing agent.

In addition, when a drying chamber is a rotary kiln type, the to-be-processed object thrown in in a kiln is stirred by rotation of a kiln, and is dried with the above-mentioned conditioned air, being conveyed by the inclination of a kiln. In the case of this rotary kiln type drying chamber, even if a foreign matter is mixed in the object to be processed, it is difficult to break down and maintenance is facilitated.

Further, when the drying chamber is a flow vibration type, the object to be processed jumps forward when vibration is applied on the screen, and is dried by the above-described conditioned air while forming a fluidized bed. In the case of this flow vibration type drying chamber, the object to be processed and moisture can be efficiently separated by utilizing the liquefaction phenomenon, so that the object to be processed can be dried more efficiently.

(1) A drying chamber for an object to be processed, a refrigerator having an evaporator and a condenser connected by a refrigerant circuit, an evaporator and a condenser disposed therein, and between the evaporator and the condenser A drying apparatus provided with an air conditioning chamber in which a moisture absorbent is arranged and the air to be conditioned is brought into contact with the evaporator, the moisture absorbent, and the condenser in this order, and an air circulation path for circulating air between the drying chamber and the air conditioning chamber. According to the above, since the evaporator and the condenser of the refrigerator are arranged in a closed circuit constituted by the drying chamber, the air conditioning chamber, and the air circulation path, both the refrigerant vaporization heat and the condensation heat are out of the system. In addition, the air in the drying chamber stays in the closed circuit and is not discharged out of the system, so that the generation of odor can be prevented.

(2) A granular body filled in a container in which a hygroscopic agent rotates or a rotary body molded in a honeycomb shape, and further arranged behind a part of the rotational area of the hygroscopic agent with respect to the flow direction of the conditioned air The hygroscopic agent that has absorbed moisture in the air to be conditioned is configured to rotate while the hygroscopic agent rotates, with the configuration including the heated heater and the blower that blows air heated by the heater toward a part of the hygroscopic agent. Since it is dried, regenerated, and repeatedly used to absorb moisture in the conditioned air, the hygroscopic agent can be used semi-permanently, and the running cost can be reduced.

(3) When the drying chamber is of a rotary kiln type, even if foreign matter is mixed in the object to be treated, it is difficult to break down and maintenance is facilitated.

(4) When the drying chamber is a flow vibration type, the object to be processed and moisture can be efficiently separated by utilizing the liquefaction phenomenon, so that the object to be processed can be dried more efficiently. It becomes.

It is a schematic block diagram of the rotary kiln type drying apparatus in embodiment of this invention. It is a top view of the air conditioning chamber of FIG. It is a front view of the air conditioning room of FIG. It is a left view of the dehumidification unit of FIG. 2B. It is a front view of the dehumidification unit of FIG. 2B. It is a right view of the dehumidification unit of FIG. 2B. It is a schematic diagram which shows the process by a dehumidification unit. It is a schematic block diagram of the flow vibration type drying apparatus which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary kiln type drying apparatus 2 Rotary kiln 20 Kiln 21 Motor 22 Input port 23 Outlet port 24 Middle cylinder 3 Air conditioning chamber 31 Evaporator 32 Condenser 33 Compressor 34

Refrigerant circuit

4a, 4b Piping 5 Dust collector 6 Dehumidification unit 60 Container 60a Shaft 61 Heater 62 Motor 63 Drive belt 7 Drain valve 8 Flow vibration dryer 9 Flow vibration dryer 9a Upper casing 9b Lower casing 10 Screen

11a Input port

11b Discharge port 12 Excitation device 13 Drying air inlet 14 Exhaust mouth

1 is a schematic configuration diagram of a rotary kiln-type drying apparatus according to an embodiment of the present invention, FIG. 2A is a plan view of the air conditioning chamber of FIG. 1, FIG. 2B is a front view, and FIG. 3A is a left side of the dehumidifying unit of FIG. 3B is a front view, and FIG. 3C is a right side view.

In FIG. 1, a rotary kiln-type drying apparatus 1 according to an embodiment of the present invention mainly includes a rotary rotary kiln 2, an air conditioning chamber 3, and an exhaust of the rotary kiln 2 that constitute a drying chamber of a portion to be processed. The pipe 4 a guides the air W to the air conditioning chamber 3 and the pipe 4 b guides the dry air D conditioned by the air conditioning chamber 3 to the rotary kiln 2. The

pipes

4 a and 4 b constitute an air circulation path for circulating air between the rotary kiln 2 and the air conditioning chamber 3. A dust collector 5 is provided in the middle of the pipe 4a.

The rotary kiln 2 includes a kiln 20 as a drying chamber that is supported with an inclination of, for example, 1/100, and a motor 21 that rotationally drives the kiln 20. The object to be processed is introduced into the kiln 20 from the inlet 22 provided on the front side in the air circulation direction. The object to be processed put into the kiln 20 is stirred by the rotation of the kiln 20 and transferred to the rear side in the air circulation direction (right to left in FIG. 1) by the inclination of the kiln 20 to circulate the air in the kiln 20. It is discharged from a discharge port 23 provided on the rear side in the direction.

In the kiln 2, an intermediate cylinder 24 connected to the pipe 4b is disposed. A large number of through holes (not shown) are provided around the middle cylinder 24, and the dry air D supplied by the pipe 4 b passes from the through holes around the middle cylinder 24 into the kiln 2. Will be erupted evenly.

As shown in FIGS. 2A and 2B, an evaporator 31 is disposed upstream and a condenser 32 is disposed downstream in the air conditioning chamber 3 with respect to the flow direction of the conditioned air (from left to right in the figure). Has been. Further, below the air conditioning chamber 3, an expansion valve (not shown), a compressor 33, and the like that are connected to the refrigerant circulation path 34 together with the evaporator 31 and the condenser 32 to constitute a refrigerator are arranged. .

Further, a dehumidifying unit 6 is disposed between the evaporator 31 and the condenser 32. As shown in FIGS. 3A, 3B, and 3C, the dehumidifying unit 6 includes a cylindrical container 60 filled with a granular hygroscopic agent, a heater 61, and a motor 62 for driving the container 60 to rotate. The driving belt 63 is configured to transmit the rotational force of the motor 62 to the container 60.

The container 60 rotates around the axis 60a in the flow direction of the conditioned air. The heater 61 is a part of the rear of the rotation region of the container 60 with respect to the flow direction of the conditioned air (the lower right region in FIG. 3C. Hereinafter, the region where the heater 61 is installed is referred to as a “regeneration region”. In addition, an area other than the reproduction area is referred to as a “processing area”. The heater 61 includes a blower (not shown) that blows air heated by the heater 61 toward the container 60.

In the rotary kiln-type drying apparatus 1 configured as described above, the object to be processed that has been input from the input port 22 is stirred by the rotation of the kiln 20 and is transferred to the discharge port 23 side by the inclination of the kiln 20. At this time, the dry air D is fed into the kiln 20 through the pipe 4b, and is ejected from the through hole around the middle cylinder 24 toward the periphery. The workpiece is transferred to the discharge port 23 while being dried by the dry air D ejected from the through hole. In the case of such a rotary kiln type drying apparatus 1, even if foreign matter is mixed into the object to be processed, the foreign matter is transferred to the discharge port 23 and discharged as it is, so that it is difficult to break down and maintenance is easy.

Further, the exhaust air (humid air) W that has absorbed the moisture of the object to be processed in the kiln 20 is sent to the dust collector 5 through the pipe 4a. In the dust collector 5, dust in the exhaust air W is separated, and only humid air is sent to the air conditioning chamber 3. In the air conditioning chamber 3, the conditioned air containing moisture (humid air) is cooled and condensed by the evaporator 31 with the heat of vaporization of the refrigerant. Thereby, the water | moisture content in humid air is isolate | separated and removed. Further, this air comes into contact with a hygroscopic agent in the rotating container 60 of the dehumidifying unit 6, moisture is absorbed by this hygroscopic agent, and moisture is removed. Thereafter, this air is heated by the condensation heat of the refrigerant by the condenser 32 and is sent as dry air D into the kiln 20 through the pipe 4b.

As described above, in the rotary kiln-type drying apparatus 1 according to the present embodiment, the evaporator 31 and the condenser 32 of the refrigerator are arranged in a closed circuit configured by the kiln 20, the air conditioning chamber 3, and the

pipes

4a and 4b. Therefore, both the heat of vaporization and the heat of condensation of the refrigerant can be effectively utilized while suppressing the heat radiation to the outside of the system. Moreover, since the air in the kiln 20 stays in the closed circuit and is not discharged out of the system, the generation of odor is prevented.

Moreover, in this rotary kiln type drying apparatus 1, when the moisture absorbent rotates together with the container 60 in the dehumidifying unit 6, it contacts the air to be conditioned in the treatment area and absorbs moisture in the air, and heats in the regeneration area. The air heated by the heater 61 is blown by a blower provided in the heater 61. Therefore, this heated air comes into contact with the moisture absorbent in the container 60 that has absorbed moisture in the conditioned air, absorbs moisture absorbed in the moisture absorbent, and flows in the flow direction of the conditioned air. It is sent in the opposite direction, i.e. forward of the container 60.

Here, since the evaporator 31 is disposed in front of the container 60, the air that has absorbed the moisture of the hygroscopic agent is cooled by the heat of vaporization of the refrigerant in the evaporator 31 and condensed to remove the moisture. . That is, the hygroscopic agent that absorbs moisture in the conditioned air is dried and regenerated in the regeneration region while the hygroscopic agent rotates, and is repeatedly used for absorbing moisture in the conditioned air in the treatment region. The water condensed by the evaporator 31 is discharged from the drain valve 7 to the outside of the system.

Next, details of the dehumidifying unit 6 will be described. FIG. 4 is a schematic diagram showing processing by the dehumidifying unit 6. In FIG. 4, the regeneration inlet indicates a regeneration region portion where air heated by the heater 61 is blown to the container 60, and the regeneration outlet indicates a portion where air flows out from the regeneration region portion. Moreover, the process inlet has shown the remaining part except the reproduction | regeneration exit part from which the air heated with this heater 61 flows out, ie, a process area | region part. The processing outlet indicates a portion through which the air flowing in from the processing inlet flows out.

As shown in FIG. 4, in the dehumidifying unit 6 in the present embodiment, the air from the processing inlet is processed air volume Q: 20.0 m ³ / min, processing air inlet temperature T _IN : 10 ° C., processing air inlet absolute humidity X _IN : 7.63 g / kg, treatment air inlet relative humidity R _IN : When flowing at 100% RH, the moisture is absorbed by the moisture absorbent in the container 60, the treatment air outlet temperature T _OUT : about 37 ° C, the treatment air outlet absolute humidity X _OUT : It flows out from the treatment outlet at a treatment air outlet dew point of −13 ° C. at 1.22 g / kg. At this time, the flow velocity VP of air is about 2.1 m / s.

On the other hand, by the blower provided in the heater 61, the regeneration air volume q from the regeneration inlet: 6.6 m ³ / min, the regeneration air inlet temperature t ₁ : 30 ° C., the regeneration air inlet absolute humidity x ₁ : 18.8 g / kg, Regenerative air inlet relative humidity r ₁ : 70% RH of air is blown to the heater 61, heated by the heater 61, and blown to the hygroscopic agent at an outlet temperature t _{2 of} 140 ° C. The heated air absorbs moisture absorbed by the hygroscopic agent and passes through the container 60. Here, this air is cooled by air at 10 ° C. flowing from the processing inlet and cooled to about t ₃ : 50 ° C., and then cooled by the evaporator 31 and condensed to remove moisture. The air flow rate VR is about 2.0 m / s.

Thereby, in the dehumidifying unit 6, the moisture absorbent is dried and regenerated in the regeneration region while the moisture absorbent is rotating, and is repeatedly used for absorbing moisture in the conditioned air in the treatment region. Therefore, the moisture absorbent can be used semipermanently. Therefore, running costs can be reduced. The hygroscopic agent used in the hygroscopic unit 6 in the present embodiment is a granular body filled in the container 60, but it may be replaced with a rotating body molded in a honeycomb shape. . In this case as well, when the rotating body formed in the honeycomb shape rotates, the moisture absorbent is dried and regenerated in the regeneration region, and the conditioned air is dehumidified by the moisture absorber in the treatment region.

In addition, although the rotary kiln type drying apparatus 1 was demonstrated in the said embodiment, it is also possible to use the thing of a flow vibration type as a drying chamber. FIG. 5 is a schematic configuration diagram of a fluid vibration type drying apparatus using a fluid vibration type drying chamber according to another embodiment of the present invention.

The flow vibration type drying apparatus 8 shown in FIG. 5 has substantially the same configuration as the rotary kiln type drying apparatus 1 of FIG. 1 except that the flow vibration type drying machine 9 is provided as a drying chamber instead of the rotary kiln 2. Constituent parts that are the same as those in FIG.

The fluid vibration type dryer 9 includes a screen 10 between the upper casing 9a and the lower casing 9b, which jumps forward while drying by vibrating the workpiece. The workpiece is introduced from the left inlet 11a in FIG. 5 and discharged from the right outlet 11b in FIG. In the lower casing 9b, there is provided a vibration device 12 that vibrates the screen 10 obliquely forward in the flow direction of the workpiece. The screen 10 is formed of punching metal in which a large number of through holes (not shown) are formed.

The dry air D conditioned by the air conditioning chamber 3 is introduced into the flow vibration dryer 9 from a plurality of drying air inlets 13 provided in the lower casing 9 b and passes to the upper casing 9 a through the through hole of the screen 10. . The workpiece to be processed introduced from the inlet 11a is oscillated forward in the flow direction on the screen 10 and jumps forward toward the outlet 11b to form the fluidized bed while forming the fluidized bed. It is dried by the dry air D that passes through the through hole.

Further, the exhaust air W having absorbed the moisture of the object to be processed in the upper casing 9a is discharged from the exhaust port 14 of the upper casing 9a and sent to the air conditioning chamber 3. The treatment of the exhaust air W in the air conditioning chamber 3 is as described above. In the case of such a flow vibration type drying device 8, the object to be treated and the water can be efficiently separated by utilizing the liquefaction phenomenon, and therefore, the flow rate drying device 8 is more efficiently covered than the rotary kiln type drying device 1. The treated product can be dried.

The drying apparatus of the present invention is useful as an apparatus for drying an object to be processed containing a liquid. In particular, since the drying apparatus of the present invention circulates air between the drying chamber and the air conditioning chamber, even if the object is treated with odor, the odor is not discharged out of the system and has high environmental performance. It is suitable as a drying apparatus.

Claims

A drying chamber for the workpiece;
A refrigerator having an evaporator and a condenser connected by a refrigerant circuit;
An air conditioning chamber in which the evaporator and the condenser are disposed, and a hygroscopic agent is disposed between the evaporator and the condenser, and the conditioned air is brought into contact with the evaporator, the hygroscopic agent, and the condenser in this order. ,
The drying apparatus provided with the air circulation path which circulates air between the said drying chamber and an air conditioning chamber.
The hygroscopic agent is a granular body filled in a rotating container or a rotating body molded into a honeycomb shape,
Furthermore, a heater disposed behind a part of the rotation region of the hygroscopic agent with respect to the flow direction of the conditioned air,
The drying apparatus according to claim 1, further comprising a blower that blows air heated by the heater toward a part of the hygroscopic agent.
The drying apparatus according to claim 2, wherein the hygroscopic agent rotates about an axis in a flow direction of the conditioned air.
The drying apparatus according to any one of claims 1 to 3, wherein the drying chamber is of a rotary kiln type.
The drying apparatus according to any one of claims 1 to 3, wherein the drying chamber is a flow vibration type.