JP2003336970A - Cold air dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold air dryer having high energy efficiency. <P>SOLUTION: Power of a micro gas turbine 20 is supplied to a cooler 40 and blowers 113 and 13, and the exhaust heat is used to operate an exhaust heat driven type cooler 30 and an exhaust heat recovery type water heater 35 at the same time. Cold generated in the exhaust heat driven type cooler 30 is used to previously cool the processed air to be supplied to a main cooler 16 in a previous cooling unit 15. Heat of the exhaust heat recovery type water heater 35 is used to raise temperature of the air heated in a main heating unit 17. The whole of the cold air dryer can be operated by using the power generated by the micro gas turbine and the exhaust heat, and cold air drying can be processed with high energy efficiency in a system good for the environment. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold air drying device having improved energy efficiency.

[0002]

2. Description of the Related Art Heretofore, a cold air drying device has been used for producing dry matter and drying various articles. This cold air drying device 10
0 will be described with reference to FIG. The drying apparatus 100 has a drying chamber 110 that accommodates an object to be dried 200, and the drying chamber 110 includes an air introducing unit 111 and an air discharging unit 112.
And have. The air exhaust unit 112 has a drying chamber 110.
A circulation fan 113 that blows out the air inside the drying chamber is provided, and a drying device main body 101 that surrounds and seals the drying chamber 110 is provided. A cold air drying unit 120 is arranged in the drying apparatus main body 101, and the cold air drying unit 120 includes a treated air intake unit 121 for taking in air to be treated from the drying chamber 110 and a cold air drying treated air. An air blower 122 that blows out into the space between the chamber 110 and the drying apparatus main body 101 is provided, and the air blower 122 is provided with a blower 123. Further, in the cold air drying unit 120, the cooling unit using the evaporator 131 of the compression refrigerator 130 is arranged on the upstream side in the flow direction of the process air, and the reheating using the condenser 132 of the compression refrigerator 130 is performed. The part is arranged on the downstream side. A cooling tower 133 for supplying cooling water is installed outside the drying apparatus main body 101 in order to further supercool the refrigerant that has exchanged heat with the processing air in the condenser 132.

The operation and operation of the conventional cold air drying device will be described. Air having a large amount of humidity in the drying chamber 110 (FIG. 6a) is taken into the cold air drying unit 120 through the air intake unit 121 and evaporated. Heat is exchanged with the vessel 131. The evaporator 131 is supplied with a liquefied refrigerant through an expansion valve (not shown), and cold heat is generated by the evaporation of the refrigerant. This cold heat cools the dry-bulb temperature of the treated air to point c as shown in FIG. 6, and the humidity of the treated air decreases accordingly. This amount of decrease in humidity becomes the amount of dehumidification.

The dehumidified and cooled air is then cooled by the condenser 13
It is used for heat exchange with 2. In the condenser 132, the refrigerant evaporated in the evaporator 131 is supplied after being compressed by a compressor (not shown) that operates on a commercial power source, and the refrigerant is in a high temperature and high pressure state. When this refrigerant and the dehumidified and cooled air having a relatively low temperature are heat-exchanged with each other, the air is heated and the temperature rises to e in FIG. The refrigerant that has exchanged heat with air is further supercooled by the cooling water supplied from the cooling tower 133 and is supplied to the expansion valve (not shown). By circulating this path, it is possible to continuously perform cold air drying of the air.

The air treated by the cold air drying section 120 is blown out from the air blowing section 122 into the main body 101 of the cold air drying apparatus by the blower 123, and is mixed with the air in the main body 101 to be cooled and humidified. The state becomes f. The blower 123 has a function of increasing the aeration rate in the drying chamber 110 to increase the drying rate and eliminating unevenness in drying. The mixed air described above is used as the air introduction part 111.
Is introduced into the drying chamber 110 through the drying chamber 110, the temperature decreases due to the latent heat of vaporization while removing moisture from the material to be dried 200 in the drying chamber 110, and the wet bulb temperature becomes a at a constant state, and the air intake portion 121 again cool air drying. It is taken into the section 120 and subjected to a cold air drying process. By repeating this cycle, the cold air drying process of the material to be dried in the drying chamber 110 is performed.

[0006]

However, the conventional cold air blower as described above needs to use a refrigerator having an extremely large electric capacity, and consumes a large amount of electric power, which is a problem. Is. For example, considering a cold air dryer having a dehumidifying capacity of 60 liters per hour, the refrigerating machine power is about 20 kW and the blower fan power is about 20 kW, for a total of about 40 kW.
A power amount of kW is required.

The present invention aims to improve the energy efficiency of this type of cold air drying device to save energy, thereby reducing energy costs, suppressing emission of carbon dioxide gas, and reducing fossil fuel consumption. The purpose is to reduce use and contribute to global environmental issues and energy depletion issues.

[0008]

That is, in order to solve the above-mentioned problems, among the cold air drying devices of the present invention, the invention according to claim 1 provides a drying chamber for accommodating an object to be dried and an air inside the drying chamber. It is equipped with a cooling unit that takes in, cools, and dehumidifies, a reheating unit that reheats the air that has been dehumidified and cooled in the cooling unit and recirculates it into the drying chamber, and an exhaust heat driven cooling device that is driven by exhaust heat. A configuration in which the cold heat generated by the exhaust heat drive type cooling device is used for all or part of the cooling in the cooling part, and the exhaust heat is used for all or part of the heating in the reheating part It is characterized by being.

According to a second aspect of the present invention, there is provided the cool air drying device according to the first aspect.
In the invention of the cold-air drying apparatus described above, the exhaust heat is obtained by an exhaust heat gas generated in a micro gas turbine that generates power by burning a fuel.

According to a third aspect of the present invention, there is provided the cold air drying device according to the first aspect.
Alternatively, in the invention of the cold air drying device as described in 2, the exhaust heat used in the reheating unit is exhausted by the exhaust heat driving type cooling device.

According to a fourth aspect of the present invention, there is provided the cool air drying device according to the first aspect.
In the invention of the cold air drying device according to any one of 1 to 3,
The exhaust heat drive type cooling device has a high temperature side hydrogen storage alloy container capable of storing and absorbing hydrogen by containing a hydrogen storage alloy, and exhaust heat gas or heat exhaust gas for heat exchange with the high temperature side hydrogen storage alloy container. The low-temperature side hydrogen storage alloy further comprises a high-temperature side heat exchanger in which a cooling heat medium is selectively used, and further, a low-temperature side hydrogen storage alloy container capable of storing and releasing hydrogen by storing a hydrogen storage alloy therein. It is equipped with a low temperature side heat exchanger into which a heat medium for cold heat is introduced to exchange heat with the container, and the high temperature side hydrogen storage alloy container and the low temperature side hydrogen storage alloy container are movably connected to each other and the low temperature side. It is characterized in that cold heat is directly or indirectly supplied by the heat medium for cold heat that has received cold heat in the heat exchanger.

According to a fifth aspect of the present invention, there is provided the cool air drying device according to the first aspect.
In the invention of the cold air drying device according to any one of
It comprises a compression type cooling device having a refrigerant compressor, an evaporator and a condenser, the cold heat obtained in the evaporator is used for a part of the cooling in the cooling section, and the heat obtained in the condenser is It is characterized in that it is used as a part of heating in the reheating section.

According to a sixth aspect of the present invention, there is provided the cool air drying device according to the first aspect.
In the invention of the cold air drying device according to any one of
It is provided with a compression-type cooling device having a refrigerant compressor, an evaporator, and a condenser, and cold heat generated in the evaporator is used as a part of cooling in the cooling unit, and heat of condensation generated in the condenser. Is used for a part of the heating in the reheating section.

The cold air drying device according to claim 7 is the device according to claim 1.
In the invention of the cold air drying device according to any one of
The cooling unit is configured in multiple stages in the flow direction of the processing air.

The cold air drying device according to claim 8 is the device according to claim 1.
In the invention of the cold air drying device according to any one of
The reheating unit is configured in multiple stages in the flow direction of the processing air.

The invention of a cold air drying device according to claim 9 is the invention of a cold air drying device according to claim 5 or 6, wherein:
The cooling unit has a pre-cooling unit on the upstream side in the flow direction of the process air and a main cooling unit on the downstream side, and the reheating unit is a main heating unit on the upstream side in the flow direction of the process air. And a post-heating section on the downstream side, of the cooling section, the pre-cooling section is cooled by the cold heat generated by the exhaust heat drive type cooling device, and the main cooling section is the compression type. Cooled by the cold heat generated in the evaporator of the cooling device,
The main heating section of the reheating section is heated by the heat generated in the condenser of the compression cooling device, and the post-heating section is heated by the exhaust heat.

That is, according to the present invention, an exhaust heat driving type cooling device driven by utilizing exhaust heat is provided, and the cooling air obtained by the cooling device dehumidifies and cools the process air in the cooling section. Since the treated air that has been dehumidified and cooled in the reheating unit is reheated by exhaust heat, it is possible to perform a cold air drying treatment with good energy efficiency.

The exhaust heat for driving the exhaust heat drive type cooling device can be obtained, for example, by exhaust heat gas generated in a micro gas turbine that generates electricity by burning fuel. Further, the same kind of exhaust heat that drives the exhaust heat driven cooling device may be used for reheating the treated air, and the exhaust heat driven cooling device is driven as described in claim 3. Alternatively, the exhaust heat discharged later may be used.

As the exhaust heat drive type cooling device, a device which generates cold heat by utilizing absorption and desorption of hydrogen in the hydrogen storage alloy is preferable. According to the exhaust heat drive type cooling device, it is possible to generate cold heat with high energy efficiency by utilizing the exhaust heat. Further, in the exhaust heat driven cooling device, a high temperature side container and a low temperature side container are provided, and these are operated in a pair, but in the pair of containers, a step of generating cold heat and a low temperature side hydrogen storage alloy The generation of cold heat is intermittent because a regeneration process for absorbing hydrogen is required. For this reason, it is possible to generate continuous cold heat by setting the number of pairs including the high temperature side container and the low temperature side container to two or more and shifting the operation cycle in each pair.

Further, the apparatus of the present invention may be provided with a compression cooling apparatus as described in claim 5, in addition to the exhaust heat driven cooling apparatus. The compression cooling device usually has a compressor which is operated by electric power, and the compressor is assumed to be operated by electric power generated by a micro gas turbine as set forth in claim 6. it can. The exhaust heat gas generated by the micro gas turbine can be used as a drive source in the exhaust heat drive type cooling device. This exhaust heat gas may be used as a drive source by directly exchanging heat with a cooling device, or may be heat exchanged with a cooling device after being received by an appropriate heat medium such as steam.

The cooling unit can be constructed in multiple stages in the flow direction of the process air as described in claim 7. For example, the first cooling unit, the second cooling unit, ... Can be configured in two or more stages. In a multi-stage cooling unit, the cooling capacity can be different for each stage.
Any one of them can be used as a main cooling unit, and the other can be used as a pre-cooling unit or a sub-cooling unit.

Similarly, the reheating unit can also be configured in multiple stages in the flow direction of the treated air, as described in claim 8, for example, the first reheating unit and the second reheating unit.
It can be composed of two or more stages such as a reheating unit. In the multi-stage reheating unit, the heating capacity may be different in each stage, and one of them may serve as a main heating unit and the other may serve as a post-heating unit or a sub-heating unit. When the cooling unit and the reheating unit are configured in multiple stages as described above, the cooling ability and heating ability of each multi-stage cooling unit can be made relatively small, and more efficient cooling means and heating means can be used. Become.

Further, as described in claim 9, a pre-cooling section and a main cooling section are provided in the cooling section, a main heating section and a post-heating section are provided in the heating section, and cooling and heating of these sections are eliminated. By sharing the role between the heat-driven cooling device and the compression cooling device, the cold air drying process can be performed with high energy efficiency. In particular, the compressor of the compression cooling device is operated by the electric power generated by the micro gas turbine, the exhaust heat driven cooling device is operated by the exhaust heat gas generated by this micro gas turbine, and the exhaust heat driven cooling device is generated. Dehumidifying and cooling the treated air in the pre-cooling section with the cold heat to
Dehumidifying and cooling the treated air in the main cooling part with the cold heat generated in the evaporation part of the compression cooling device, and then reheating the treatment air in the main heating part with the heat obtained in the condensation part of the compression cooling device,
Furthermore, if the post-heating unit reheats the treated air with the exhaust heat generated by the exhaust heat drive type cooling device, the cold air drying process can be performed with remarkably high energy efficiency.

That is, the electric power of the micro gas turbine is supplied to the cooling device and the blower, and the exhaust heat can be used to simultaneously operate the exhaust heat driven cooling device and the exhaust heat recovery water heater. The cold heat generated by the exhaust heat drive type cooling device is used to pre-cool the process air to the evaporator, and the hot heat of the exhaust heat recovery water heater is used to further raise the temperature of the air heated by the condenser. can do.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a micro gas turbine, a compression type cooling device operated by electric power of the micro gas turbine, and a hydrogen storage alloy driven by exhaust heat gas generated in the micro gas turbine are used. A cold air drying device in combination with the exhaust heat driven cooling device will be described with reference to FIGS. 1 to 4. The same components as those of the conventional cold air drying device 100 are designated by the same reference numerals, and the description thereof will be simplified or omitted.

The cool air drying device 1 has a drying chamber 110 for accommodating the material to be dried 200, and the drying chamber 110 is provided with an air introducing section 111, an air discharging section 112 and a circulation fan 113. A cold air drying unit 10 is arranged in the drying apparatus main body 101. In the cold air drying unit 10, a treated air intake unit 11 that takes in air to be treated from a drying chamber 110 and a cold air drying treated air drying chamber. Air blower 1 blown into the space between 110 and the drying apparatus main body 101
2 and a blower 13 is provided in the air blowing unit 12.
Is provided. Further, in the cold air drying unit 10, the pre-cooling unit 1 that dehumidifies and cools the processing air by the cold heat supplied from the exhaust heat driven cooling device in the flow direction of the processing air.
5. Discharge from the main cooling unit 16 that uses the cold heat obtained in the evaporator of the compression cooling device 40, the main heating unit 17 that uses the heat obtained in the condenser of the compression cooling device 40, and the exhaust heat driven cooling device The post-heating unit 18 that utilizes the exhaust heat generated is provided.

Reference numeral 20 in the drawing denotes a micro gas turbine installed outside the cold air drying device, which burns a fuel such as fossil fuel and the like, and a generator 22 is provided in the internal gas turbine section 21.
The exhaust heat gas, which is generated by the combustion of the fuel and is used to generate electric power, is discharged from the exhaust unit 23 and is supplied to the exhaust heat driven cooling device 30 described later. The electric power generated by the micro gas turbine 20 is supplied to the compressor 41 of the compression cooling device 40 described later, and other devices (cooling water pump, etc.) of the circulation fan 113, the blower 13, and the cool air drying device described above. Is used for the operation of.

Next, the exhaust heat drive type cooling device 30 is shown in FIG.
It will be described in detail based on. The exhaust part 23 of the micro gas turbine 20 is connected to an exhaust heat gas transfer pipe 301 that branches into two paths on the way via a gas path switch 302, and each branch path has a container-shaped high temperature side. The heat exchangers 303a and 303b are connected. The high temperature side heat exchangers 303a and 303b are the hydrogen storage alloy containers 3 each of which is composed of a large number of cylinders containing the high temperature side hydrogen storage alloy powder.
04a, 304b are provided inside, and the container 304
In a and 304b, hydrogen can be vented by disposing a venting material (not shown) or the like. Hydrogen storage alloy container 30
4a and 304b respectively have hydrogen transfer tubes 310a and 3a.
10b is connected to these hydrogen transfer pipes 310a,
310b extends outside the high temperature side heat exchangers 303a and 303b and is connected to low temperature side heat exchangers 320a and 320b, which will be described later.

Further, the high temperature side heat exchangers 303a, 303b
In order to cool the internal hydrogen storage alloy containers 304a, 304b, cooling water supply pipes 305a, 30b are provided.
5b is connected to each cooling water supply pipe 305a, 30
5b is provided with on-off valves 306a and 306b,
Intermittent water supply is possible. Each cooling water supply pipe 305
a and 305b are opening / closing valves 306a and 306b, respectively.
On the upstream side of the cooling tower 133 through the pump 134
Connected to the output side of. Also, the high temperature side heat exchanger 303
The cooling water supply pipes 305a and 305 are provided at a and 303b.
b through the hydrogen storage alloy containers 305a, 30
Drain pipes 307a and 307b for discharging the cooling water after cooling 5b to the outside of the heat exchanger are connected, and these drain pipes 307a and 307b are joined together in a drain tank 308 and then cooled by the pump 135. It is connected to the return side of the tower 133 and configured so that the cooling water supplied for cooling flows back.

Further, the high temperature side heat exchangers 303a, 303b
Is connected to exhaust gas ducts 309a and 309b for discharging the exhaust heat gas introduced thereinto, and these ducts 309a and 309b are connected to the water heater 35 via the path switching device 351. The water heater 35 is configured to exchange heat between the exhaust gas and water, and the hot water obtained by the heat exchange is supplied to the post-heating unit 18 described above.

Further, the low temperature side heat exchangers 320a and 320b connected to the high temperature side heat exchangers 304a and 304b through the hydrogen transfer pipes 310a and 310b are provided with hydrogen storage alloy containers 321a and 321b therein. , The container 3
21a and 321b and hydrogen transfer pipes 310a and 310b are connected so that hydrogen transfer is possible. Hydrogen storage alloy powder is stored in the hydrogen storage alloy containers 321a and 321b in a ventilable manner. Incidentally, the hydrogen storage alloy container 30
The hydrogen storage alloys stored in the hydrogen storage alloys 4a and 304b and the hydrogen storage alloys stored in the hydrogen storage alloy containers 321a and 321b are appropriately selected from the viewpoint of obtaining a desired hydrogen equilibrium pressure difference between the high temperature side and the low temperature side. Select the alloy with the composition.

Further, the low temperature side heat exchangers 320a and 320b
In order to bring the heat storage medium for cooling or cooling into contact with the hydrogen storage alloy containers 321a, 321b, heat transfer medium introduction pipes 322a, 322b for introducing the heat transfer medium and heat medium discharge for discharging the heat transfer medium. The pipes 323a and 323b are connected.
The heat medium introduction pipes 322a and 322b, the heat medium discharge pipe 323
a and 323b extend outside the low temperature side heat exchangers 320a and 320b, and one port of the three-way valve 325a is connected to the heat medium discharge pipe 323a. One of the other ports of the three-way valve 325a is connected to the return side of the cooling water tank 330, and the other port is connected to the return side of the heating medium tank 340 for cold heat. The heat medium introducing pipe 322a is provided with a three-way valve 326.
a, 326b each connected to one port, three-way valve 3
26a, one of the other ports is connected to the flow side of the heat medium tank 340 for cold heat via a heat medium pump 341, and the other port is a heat medium introducing pipe connected to the low temperature side heat exchanger 320b. 322b is connected.

The heat medium introducing pipe 322b is also connected to the other one port of the three-way valve 326b, and the sending side of the cooling water tank 330 is connected to the other port via the cooling liquid pump 331. ing. In addition, the heat medium discharge pipe 3
23b is connected to one port of the three-way valve 325b, the return side of the cooling water tank 330 is connected to the other one port of the three-way valve 325b, and the other port is connected to the return port of the heating medium tank 340 for cold heat. It is connected to the flow side.

This apparatus has two heat exchangers on the high-temperature side and two heat exchangers on the low-temperature side, and is provided with two pairs of heat exchangers, and the refrigerating output is alternately provided in each pair. Occur. The specific operation will be described below. In the micro gas turbine 20, a fuel such as natural gas is introduced and burned to operate the gas turbine unit 21,
The output drives the generator 22 to generate electricity. This electric power is supplied to the compressor 41 and the like described later.

In the gas turbine section 21, exhaust heat gas having exhaust heat of about 300 ° C. is generated by combustion of fuel. The exhaust heat gas is transferred from the exhaust unit 23 to the exhaust heat gas transfer pipe 301.
Is discharged to the outside of the micro gas turbine 20 through the gas path switch 302 and introduced into the high temperature side heat exchanger 303a or 303b. In FIG. 1, the high temperature side heat exchanger 3
The high temperature side heat exchanger 303b side is in communication with the 03a side and the path is blocked. At this time, hydrogen is stored in the hydrogen storage alloy in the hydrogen storage alloy container 304a of the high temperature side heat exchanger 303a.
It is assumed that hydrogen is released from the hydrogen storage alloy in the hydrogen storage alloy container 304a. Further, on the low temperature side, the hydrogen storage alloy container 321 of the low temperature side heat exchanger 320a
It is assumed that hydrogen is released in the hydrogen storage alloy in a and hydrogen is stored in the hydrogen storage alloy in the hydrogen storage alloy container 321b of the low temperature side heat exchanger 320b.

The exhaust heat gas traveling in the exhaust heat gas transfer pipe 301 follows the high temperature side heat exchanger 3 according to the gas path switch 302.
It is introduced to the 03a side, exchanges heat with the hydrogen storage alloy container 304a, and is discharged from the exhaust gas duct 309a. The exhaust gas passes through the exhaust gas duct 309a and is sent to the water heater 35 via the path switching device 351 which works in conjunction with the gas path switching device 302, and exchanges heat with water to obtain hot water. In addition,
The path switch 351 corresponds to the heat exchanger on the side where the gas path switch 302 is switched and the exhaust heat gas is introduced, so that the exhaust gas discharged from the heat exchanger is introduced to the water heater 35. Switch the route. In this water heater 35, for example, hot water of about 60 ° C. can be generated.

In the hydrogen alloy container 304a, the internal hydrogen storage alloy is heated by heat exchange with the exhaust heat gas. In the heated hydrogen storage alloy, the stored hydrogen is released. The hydrogen moves to the low temperature side heat exchanger 320a through the hydrogen transfer pipe 310a due to the equilibrium pressure, and this hydrogen is stored by the hydrogen storage alloy in the hydrogen storage alloy container 321a of the low temperature side heat exchanger 320a. At this time, the heat medium introduction pipe 322a and the heat medium discharge pipe 323a are operated by operating the three-way valves 325a, 325b, 326a, 326b.
Is connected to the cooling water tank 330, and the cooling water is supplied to the heat exchanger 32.
0a to cool the hydrogen storage alloy in the hydrogen alloy container 321a to promote hydrogen storage. This step corresponds to the step of regenerating the hydrogen storage alloy on the low temperature side, and corresponds to the preparatory step of generating cold heat in the subsequent step.

On the other hand, on the high heat side heat exchanger 303b side, the above process has already been performed as a previous process, and hydrogen is released from the hydrogen storage alloy, and the hydrogen is stored in the hydrogen storage alloy in the hydrogen alloy container 321b. It is in the occlusion state. The high temperature side heat exchanger 303b is in a state after being heated by the exhaust heat gas in the same manner as described above, and the hydrogen storage alloy container 304b and the hydrogen storage alloy inside are also in a high temperature state. In this state, the valve 306b is opened (the valve 306a is in a closed state) in parallel with the above process, and the cooling water supply pipe 30
5b and the cooling tower 133 are connected, cooling water is sent from the cooling tower 133 by the pump 134, and the hydrogen storage alloy container 30
4a and cooling water exchange heat and hydrogen storage alloy container 304
b and the hydrogen storage alloy inside the container 304b are cooled. The cooling water that has undergone heat exchange with the container is recovered in the cooling water recovery tank 308 through the cooling water discharge pipe 307b,
It is returned to the cooling tower 133 by the pump 135.

In the hydrogen storage alloy container 304b, the hydrogen equilibrium pressure of the internal hydrogen storage alloy is lowered by the cooling, and a hydrogen suction force is generated. This suction force is applied to the hydrogen transfer pipe 31.
It is transmitted to the hydrogen storage alloy container 321b on the low temperature side through 0b. In the hydrogen storage alloy container 321b, hydrogen is released from the hydrogen storage alloy that is storing hydrogen by this suction force, and this hydrogen is stored in the hydrogen storage alloy in the high temperature side hydrogen alloy container 304b through the hydrogen transfer pipe 310b. . In the hydrogen storage alloy container 321b, cold heat is generated by the release of hydrogen. In the low temperature side heat exchanger 320b, the heating medium introducing pipe 322b and the heating medium discharging pipe 323b are connected to the cold heating medium tank 340 by operating the three-way valves 325a, 325b, 326a, 326b, and the heating medium introducing pipe 322b, the heating medium discharging The cold heat is transmitted to the heat medium for cold heat circulating through the pipe 323b. Since this heat medium flows back to the heat medium tank 340, it is supplied to the pre-cooling section 15 to obtain a cooling action. For example, water can be used as a heat medium to generate cold water at about 10 ° C. In the above, the high temperature side heat exchanger 303a,
The regeneration process was performed between the low temperature side heat exchangers 320a, and the cold heat generation process was performed between the high temperature side heat exchangers 303b and the low temperature side heat exchangers 320b. After completing the above process, the high temperature side heat exchangers 303a , Process between low temperature side heat exchanger 320a, high temperature side heat exchanger 303b, low temperature side heat exchanger 320b
The cold heat generation and regeneration steps can be performed by reversing the steps in between. Then, by alternately performing the above operations in the high temperature side heat exchanger 303a, the low temperature side heat exchanger 320a, the high temperature side heat exchanger 303b, and the low temperature side heat exchanger 320b, the cold heat is continuously obtained and the precooling unit 15 is obtained. Can be supplied.

As described above, in this cooling device, the cooling output can be efficiently generated by the exhaust heat gas generated from the micro gas turbine, and it is possible to obtain an energy generating device having a very large energy utilization efficiency as a whole. it can. In addition, in terms of environment, it is possible to obtain a cooling output without damaging the environment, and it can be said that the device is also excellent in terms of environment in combination with a micro gas turbine having excellent environment properties.

Next, the compressor cooling device 40 provided in the cold air drying device of the present invention will be described with reference to FIG. In the compression cooling device 40, the micro gas turbine 20
The compressor 41 driven by the electric power generated in 1. compresses the refrigerant circulating in the compression cooling device 40 to high temperature and high pressure. A first condenser 42 capable of exchanging heat with the process air is connected to the output side of the compressor 41, and the first condenser 42 constitutes the main heating unit 17. At the output side of the first condenser 42, the cooling tower 1
Second condenser 4 that exchanges heat with the cooling water supplied from 33
3 is connected to the output side of the second condenser 42, and the inlet side of the refrigerant liquid storage portion 44 for storing the liquefied refrigerant is connected to the output side of the second condenser 42. An expansion valve 45 is provided on the outlet side of the refrigerant liquid storage portion 44.
Of the expansion valve 45 is connected to an evaporator 46 capable of exchanging heat with air. The evaporator 46 constitutes the main cooling unit 16. The compressor 41 is connected to the output side of the evaporator 46, and the refrigerant is circulated along this path.

The operation of the compression type cooling device 40 will be described. When the high-pressure liquid refrigerant stored in the refrigerant storage portion 44 is transferred to the expansion valve 45, it is decompressed and easily evaporated. When this medium-pressure refrigerant liquid is sent to the evaporator 46, cold heat is generated by evaporation, and the air can be dehumidified and cooled. The refrigerant gas vaporized by the evaporator 46 is compressed by the compressor 41 to become a high temperature and high pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is sent to the first condenser 42, where it is heat-exchanged with the relatively low-temperature air to be in a wet vapor state.
On the other hand, the air is heated by the heat of the refrigerant gas. The refrigerant gas in the wet vapor state is sent to the second condenser 43, where it is cooled by the cooling water supplied from the cooling tower 133 and is supercooled to become a high-pressure refrigerant liquid. This refrigerant liquid is sent to and stored in the refrigerant storage section 44. The above operation is continuously performed by circulating the refrigerant through the path.

Next, the operation of the entire cold air drying device of the present invention will be described. Air containing a large amount of humidity (a in FIG. 4) in the drying chamber 110 is taken into the cold air drying unit 10 through the air intake unit 11 and is heat-exchanged with the pre-cooling unit 15 to be pre-cooled. As described above, the precooling unit 15 is supplied with the cold heat obtained by the exhaust heat driving type cooling device 30, and is cooled to the temperature shown in FIG. 4B. The temperature drop at this time is relatively small, and since it is below the saturated vapor pressure, the humidity is maintained at the same level as before pre-cooling. The precooled air is then cooled in the main cooling section 16. As described above, the main cooling unit 16 is supplied with cold heat by the evaporator 46 of the compression type cooling device 40, the process air is further cooled, reaches the saturated vapor pressure, and reaches the point c as shown in FIG. Dehumidified and cooled.

Next, the dehumidified and cooled air is supplied to the main heating unit 1.
7 and is reheated in the main heating section. In the main heating unit 17, heat exchange with the first condenser 132 is performed as described above, and the dehumidified cooling air is heated to raise the temperature to d shown in FIG. This reheated air is further heated in the post-heating section 18. After this, in the heating unit 18, as described above, the water heater 3
It is possible to exchange heat with the hot water generated in 5, and the treated air is appropriately heated to raise the temperature to e in FIG.

The air treated by the cold air drying unit 10 is blown out from the air blowing unit 12 into the main body 101 of the cold air drying device by the blower 13, and is mixed with the air in the main body 101 to be heated and humidified. The state shown in f is entered, the temperature is lowered by the latent heat of vaporization while the moisture enters the drying chamber 101, and the wet-bulb temperature is constant a
become. By repeating this cycle, the drying chamber 11
The cold air drying process of the object 200 to be dried in 0 is efficiently performed. In the cold air drying device of the present invention, the load of the compression type refrigerator for dehumidifying cooling is reduced by cooling a → b,
The heating of d → e lowers the relative humidity and improves the drying efficiency.

Further, the electric power and exhaust heat generated by the micro gas turbine can be used to operate the entire cold air drying device, and the cold air drying process can be performed with high energy efficiency in a system excellent in the environment.

In the cold air drying device of the present invention, for example,
Assume a cold air dryer with a dehumidifying capacity of 60 liters per hour. By constructing a system that combines a 30kW micro gas turbine, a 14kW hydrogen storage alloy cooling device driven by its exhaust heat, and a 25kW water heater, the power required for a compression refrigerator will be approximately 10kW. , 30kW is required together with other power.
On the other hand, in the conventional cool air drying device, the power consumption for obtaining the same dehumidifying capacity is 40 kW, so that the power saving is about 25%.

[0048]

As described above, according to the cold air drying apparatus of the present invention, the drying chamber for storing the material to be dried, the cooling unit for taking in the air in the drying chamber to cool and dehumidify, and the cooling unit. It is equipped with a reheating unit that reheats the air that has been dehumidified and cooled by recirculation into the drying chamber, and an exhaust heat drive type cooling device that is driven by exhaust heat. Is used for all or part of the cooling in the cooling unit, and exhaust heat is used for all or part of the heating in the reheating unit, so that the exhaust heat can be used efficiently. It also enables a cold air drying process that is environmentally friendly.

[Brief description of drawings]

FIG. 1 is a schematic view showing an entire cold air drying device according to an embodiment of the present invention.

FIG. 2 is a path diagram for explaining the exhaust heat drive type cooling device.

FIG. 3 is a path diagram for explaining the compression type cooling device.

FIG. 4 is a graph showing changes in temperature and humidity of treated air by the same cold air drying treatment.

FIG. 5 is a schematic view showing an entire conventional cold air drying device.

FIG. 6 is a graph showing changes in temperature and humidity of treated air by the same cold air drying treatment.

[Explanation of symbols]

1 Cold air dryer 10 Cold air drying section 11 Air intake 12 Air outlet 13 blower 15 Pre-cooling section 16 Main cooling unit 17 Main heating part 18 After heating section 20 micro gas turbine 21 Gas turbine section 22 generator 23 Exhaust section 30 Exhaust heat driven cooling device 301 Exhaust heat gas transfer pipe 302 Gas path switch 303a High temperature side heat exchanger 303b High temperature side heat exchanger 304a Hydrogen storage alloy container 304b Hydrogen storage alloy container 309a Exhaust gas duct 309b Exhaust gas duct 310a Hydrogen transfer tube 310b Hydrogen transfer tube 320a low temperature side heat exchanger 320b Low temperature side heat exchanger 321a Hydrogen storage alloy container 321b Hydrogen storage alloy container 330 Cooling water tank 340 Heat medium tank for cold heat 35 water heater 40 compression cooling device 41 compressor 42 first condenser 43 Second condenser 44 Refrigerant reservoir 45 expansion valve 46 Evaporator 101 Cold air dryer main unit 110 drying room 133 cooling tower 200 Dried items

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F25B 29/00 421 F25B 29/00 421 431 431A F26B 21/04 F26B 21/04 D

Claims (9)

[Claims] 1. A drying chamber for accommodating an object to be dried, a cooling unit for taking in air in the drying chamber to cool and dehumidify it, and reheat the air dehumidified and cooled by the cooling unit to recirculate it into the drying chamber. A reheating unit and an exhaust heat driven cooling device driven by exhaust heat are provided, and cold heat generated by the exhaust heat driven cooling device is used for all or part of cooling in the cooling unit, A cool air drying device, characterized in that exhaust heat is used for all or part of the heating in the reheating unit. 2. The exhaust heat for driving the exhaust heat driven cooling device is obtained from exhaust heat gas generated in a micro gas turbine that generates electricity by burning fuel. Cold air dryer. 3. The cool air drying device according to claim 1, wherein the exhaust heat used in the reheating section is exhausted by an exhaust heat driving type cooling device. 4. The exhaust heat driven cooling device has a high temperature side hydrogen storage alloy container for accommodating a hydrogen storage alloy and capable of absorbing and releasing hydrogen, and performs heat exchange with the high temperature side hydrogen storage alloy container. Therefore, the exhaust heat gas or the cooling heat medium is provided with a high temperature side heat exchanger that is selectively used, and further has a low temperature side hydrogen storage alloy container that accommodates a hydrogen storage alloy and enables hydrogen absorption and desorption. The low temperature side hydrogen storage alloy container is equipped with a low temperature side heat exchanger into which a heat medium for cold heat is introduced to exchange heat, and the high temperature side hydrogen storage alloy container and the low temperature side hydrogen storage alloy container are movably connected to each other. The cold air drying according to any one of claims 1 to 3, wherein cold heat is directly or indirectly supplied by the heat medium for cold heat that has received cold heat in the low temperature side heat exchanger. apparatus. 5. A compression type cooling device having a refrigerant compressor, an evaporator and a condenser is provided, and cold heat obtained in the evaporator is used as a part of cooling in the cooling section, and the condenser is provided. The cold air drying device according to any one of claims 1 to 4, wherein the heat obtained in (1) is used as part of the heating in the reheating unit. 6. The cool air drying device according to claim 5, further comprising a compressor operated by electric power generated by a micro gas turbine. 7. The cooling unit is configured in multiple stages in a flow direction of process air.
The cold air drying device according to any one of 6 above. 8. The reheating unit is configured in multiple stages in the flow direction of the processing air.
The cold air drying device according to any one of to 7. 9. The cooling unit has a pre-cooling unit on the upstream side in the flow direction of the process air and a main cooling unit on the downstream side, and the reheating unit is on the upstream side in the flow direction of the process air. And a post-heating section on the downstream side, and the pre-cooling section among the cooling sections is cooled by the cold heat generated by the exhaust heat driving type cooling device, and the main cooling section is provided. Then, cooled by the cold heat generated in the evaporator of the compression cooling device, among the reheating unit, in the main heating unit, is heated by the heat generated in the condenser of the compression cooling device, in the post-heating unit, The cold air drying device according to claim 5 or 6, wherein the device is heated by exhaust heat.