JP2013234771A - Drying system equipped with dehumidifying mechanism for dry air - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drying system equipped with a new dehumidifying mechanism for dry air, in which a heat pump unit applied to a temperature elevation mechanism can be suitably operated at a low running cost, particularly, even under a condition of high humidity in outside air such as in a season from spring to autumn, a dried product conditioned to a desired dry state can be stably obtained at a low cost.SOLUTION: An air supply mechanism 2 includes a temperature elevating mechanism 3 and a dehumidifying mechanism 5 to elevate the temperature of outside air A0 and dehumidify the outside air. The temperature elevating mechanism 3 includes a heat pump unit 30. The mechanism is configured to supply heat source water W with decreased temperature due to heat exchange with a coolant in an evaporator 33 in the heat pump unit 30, as a cold heat source to other components in the air supply mechanism 2, and thereby, to be capable of taking heat into the heat source water W.

Description

  The present invention relates to a drying system provided with a drying device such as a fluidized bed dryer, and in particular, a desired drying state is achieved even under conditions of high outdoor air humidity, such as the season from spring to autumn. The present invention relates to a drying system provided with a dry air dehumidifying mechanism that can obtain a dried product stably and at low cost.

The points to keep in mind when designing a drying system equipped with a fluidized bed dryer, etc. are that it can handle a wide range of materials, that it has excellent dry product quality, and that it has excellent energy savings. Etc.
First, from the viewpoint of processing a wide range of materials, it is preferable to employ a so-called one-pass type apparatus. This is because the one-pass type apparatus supplies the outside air heated by the temperature raising mechanism to the dryer as dry air, and exhausts the dry air containing moisture by drying the object to be dried. It is a waste. On the other hand, in the case of a circulation type device that dehydrates dry air containing moisture with a dehumidification mechanism and then raises the temperature again to provide it as dry air, adhesion or corrosion of volatile components contained in the exhaust to the dehumidification mechanism Since there is a concern about the action, it is not suitable for the treatment of an object to be dried containing volatile components.

Next, from the viewpoint of the stability of the quality of the dried product, in the one-pass type device, when the outside air is used as dry air without dehumidification, the dried product is used under the condition that the humidity of the outside air is high from spring to autumn. The moisture of the may become high. For this reason, it is preferable to provide a dehumidifying mechanism, but since the operation rate of the dehumidifying mechanism is extremely low from autumn to spring, and the cost effectiveness is low throughout the year, the introduction of such a dehumidifying mechanism is often the case. .
In addition, for example, the fluidized bed dryer includes a type that cools a material to be dried that has been dried in a fluidized chamber in a separate compartment in the fluidized chamber. In this case, the humidity of the outside air that is used as cooling air When the temperature is high, cooling and drying may be insufficient.

Next, from the viewpoint of energy saving, it is preferable to reuse the exhaust heat in the flow and apply a heat pump unit to the heat source as has been widely attempted.
As the dehumidifying mechanism, it is also preferable from the viewpoint of energy saving to adopt a desiccant dehumidifier in that driving energy is not required for dehumidification.

From the various viewpoints described above, it is reasonable to construct a drying system on the premise of a one-pass type in order to process a wide range of materials without being affected by seasonal fluctuations. Although various attempts have already been made as a drying system, the technical pursuit has not always been pursued.
For example, it has been attempted to apply a heat pump unit to a drying apparatus, and as an example, an apparatus to which a desiccant dehumidifier and a heat pump unit are applied has been developed (see, for example, Patent Document 1). The apparatus disclosed in Patent Document 1 is a dry air that is heated by a temperature raising mechanism, supplies dehumidified air as dry air to a dryer, and dries the object to be dried. Since this is a circulation type apparatus that dehumidifies and then raises the temperature again to provide it as dry air, it is not suitable for the treatment of the object to be dried containing volatile components as described above.

In addition, the heat pump unit in the apparatus disclosed in Patent Document 1 is not described in detail in the specification, but can use carbon dioxide as a refrigerant to make the temperature of dry air about 120 ° C. Those skilled in the art will understand that this is applicable. Patent Document 1 shows a configuration in which a gas dehumidified by a desiccant dehumidifier is heated in a condenser in a heat pump unit.
However, in the heat pump unit as described above, a gas to be heated at 40 ° C. or higher cannot be supplied to the condenser. For example, when air at 35 ° C. is dehumidified by a desiccant dehumidifier, the temperature of the dehumidified air becomes approximately 50 ° C. due to moisture adsorption heat. Therefore, the apparatus configuration disclosed in Patent Document 1 has high thermal efficiency and high-temperature dry air. The operating conditions in actual use in consideration of the application of the heat pump that generates the gas were not considered.

JP 2010-197035 A

  The present invention has been made in view of such a background, and is provided with a temperature raising mechanism for raising the temperature of the outside air and a dehumidification mechanism for dehumidifying the outside air. In the drying system, the heat pump unit applied to the temperature raising mechanism can be operated suitably and at a low running cost, and it is desirable even under conditions of high outside air humidity, such as the season from spring to autumn. The technical problem is to develop a drying system equipped with a novel dry air dehumidifying mechanism that can stably obtain a dried product in a dry state at a low cost.

  That is, the drying system provided with the dehumidifying mechanism for dry air according to claim 1 is a drying system provided with a dryer and an air supply mechanism for supplying dry air to the dryer. Comprises a temperature raising mechanism for raising the temperature of the outside air and a dehumidifying mechanism for dehumidifying the outside air, so that the temperature of the outside air is raised and dehumidified. The temperature mechanism is provided with a heat pump unit, and heat source water whose temperature is lowered by exchanging heat with the refrigerant in the evaporator in the heat pump unit is supplied to the other structure in the air supply mechanism. By being provided as a cold heat source for the element, the heat source water is configured to be able to take in heat.

  A drying system provided with a dehumidifying mechanism for dry air according to claim 2 is configured to include a cooling dehumidifier in addition to the requirements of claim 1, and this cooling dehumidifying mechanism is provided. As a cold heat source in the apparatus, heat source water whose temperature is lowered by exchanging heat with the refrigerant in the evaporator in the heat pump unit is provided.

  Furthermore, a drying system provided with a dehumidifying mechanism for dry air according to claim 3 is configured to include a desiccant dehumidifier in addition to the requirements of claim 1, and the desiccant When supplying the outside air dehumidified by the dehumidifier to the condenser in the heat pump unit, a cooler for reducing the temperature is provided, and a refrigerant in the evaporator in the heat pump unit is used as a cooling heat source in the cooler. It is characterized in that it provides heat source water whose temperature has been lowered by exchanging heat with each other.

  Furthermore, a drying system provided with a dehumidifying mechanism for dry air according to claim 4 is configured to include a desiccant dehumidifier in addition to the requirements of claim 1, and the heat pump The outside air heated by the condenser in the unit is configured to be dehumidified by the desiccant dehumidifier, and includes a cooler for lowering the temperature of the hot air supplied to the dehumidifying element of the desiccant dehumidifier. As a cooling heat source in the cooler, heat source water whose temperature is lowered by performing heat exchange with the refrigerant in the evaporator in the heat pump unit is provided.

  Furthermore, the drying system provided with the dehumidifying mechanism for dry air according to claim 5 is cooled by a cooling dehumidifier or a cooler in addition to the requirements of claim 2, 3 or 4. Further, a mechanism for supplying the outside air to the dryer is provided.

  Furthermore, the drying system provided with the dehumidifying mechanism for dry air according to claim 6 is not limited to the requirements described in claim 1, 2, 3, 4 or 5, and the air supply mechanism is heated by a temperature raising mechanism. A temperature raising device is provided for further raising the temperature of the outside air that has been heated and dehumidified by the dehumidifying mechanism.

Furthermore, in addition to the requirement of claim 1, 2, 3, 4, 5 or 6, the drying system provided with the dehumidifying mechanism of dry air according to claim 7 is characterized in that the heat pump unit uses carbon dioxide as a refrigerant. It is characterized by what it does.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

First, according to the first aspect of the present invention, the moisture of the dried product can be maintained at a constant quality without seasonal variation. Also, the heat source of the heat pump unit can be obtained from other components in the air supply mechanism, and this heat can raise the temperature of the outside air, so that the drying system can be operated in an energy efficient state. it can.
In addition, by increasing the temperature of the heat source water, the difference between the temperature of the heat source water side (evaporator side) in the heat pump unit and the temperature of the temperature rising side of the outside air (condenser side) is reduced, resulting in a drying system. Overall energy efficiency is improved and operation at a low running cost is possible.
Furthermore, since a dry air one-pass system is adopted, it is possible to handle an object to be dried containing a volatile component.

  According to the second aspect of the present invention, when the outside air is cooled by the heat source water whose temperature has been lowered by exchanging heat with the refrigerant in the evaporator in the heat pump unit, dehumidification is performed and heat is simultaneously applied to the heat source water. Since it can be taken in, this drying system can be operated in a highly energy efficient state by using this heat to raise the temperature of the outside air in the heat pump unit.

Furthermore, according to the third aspect of the present invention, the desiccant dehumidifier dehumidifies and heats up by the moisture adsorption heat by the heat source water whose temperature has decreased by exchanging heat with the refrigerant in the evaporator of the heat pump unit. By cooling the outside air that is in a dry state, heat can be taken into the heat source water, so this heat is used to raise the temperature of the outside air in the heat pump unit, thereby operating the drying system in a highly energy efficient state. be able to.
In addition, the outside air dehumidified in the desiccant dehumidifier is in a state of being heated by moisture adsorption heat, but the temperature can be lowered below the allowable temperature of the heat pump unit, and the heat pump unit is operated under favorable conditions. It becomes possible.

Further, according to the fourth aspect of the present invention, since normal temperature outside air is supplied to the heat pump unit and the temperature of the outside air is raised, the heat pump unit can be operated under favorable conditions.
In addition, by cooling the hot air supplied to the regeneration of the dehumidifying element of the desiccant dehumidifier, heat can be taken into the heat source water, so this heat is used to raise the temperature of the outside air in the heat pump unit. It can be operated with high efficiency.

  Furthermore, according to the fifth aspect of the present invention, the cooling energy of the cooling source generated from the heat pump unit can be used in the drying system, and the object to be dried can be taken out from the dryer as a dried product. Further, it is possible to suppress deterioration of quality that is likely to occur in a dried product taken out from a dryer while retaining heat. Moreover, since it uses the cold energy of a heat pump unit compared with the case where a dried product is cooled with a separate cooling device after taking out from the dryer, the drying system can be operated in a more energy efficient state.

  Furthermore, according to the invention described in claim 6, it is possible to further raise the temperature of the dry air heated by the heat pump unit to a temperature required for the hot air dryer. For this reason, it is possible to configure a drying system to which a dryer that requires high-temperature dry air is applied, and an operation with high energy efficiency can be performed using this drying system.

  Furthermore, according to the seventh aspect of the invention, by using carbon dioxide as a refrigerant, the temperature of the dry air heated by the heat pump unit can be increased to 100 to 120 ° C., and the drying system can be made energy efficient. It is possible to drive in a high state.

It is a block diagram which shows the drying system provided with the dehumidification mechanism of the dry air of this invention comprised by providing the cooling dehumidifier as a dehumidification mechanism. It is a block diagram which shows the drying system provided with the dehumidification mechanism of the dry air of this invention comprised including the desiccant dehumidifier as a dehumidification mechanism. It is a block diagram showing a drying system provided with a desiccant dehumidifier as a dehumidifying mechanism and equipped with a dehumidifying mechanism for dry air according to the present invention configured to recover heat from hot air supplied for regeneration of a dehumidifying element.

  The form of a drying system provided with a dehumidifying mechanism for dry air according to the present invention is as shown in the following examples. Is possible.

A drying system S (hereinafter referred to as a drying system S) provided with a dehumidifying mechanism for dry air according to the present invention includes a dryer 1 and an air supply mechanism 2 for supplying the dryer 1 with the dry air Ad. It is made up of. The air supply mechanism 2 includes a temperature raising mechanism 3 for raising the temperature of the outside air A0 and a dehumidifying mechanism 5 for dehumidifying the outside air A0, so that the outside air A0 is raised and dehumidified. It is composed. The temperature raising mechanism 3 includes a heat pump unit 30, and the heat source water W whose temperature has been lowered by exchanging heat with the refrigerant in the evaporator 33 in the heat pump unit 30 By providing it as a cold heat source for other components in the air supply mechanism 2, heat can be taken into the heat source water W.
The drying system S of the present invention produces a dry exhaust gas containing moisture in the dry air Ad by drying an object to be dried, but it is a one-pass type that exhausts outside without being recycled and used. The configuration is taken.
In addition to the outside air A0, for example, nitrogen gas or the like can be used as a processing target of the drying system S as long as the gas has a temperature and humidity equivalent to the outside air A0.
Hereinafter, each drying system S having a different configuration will be described.

[Example 1]
First, the drying system S shown in FIG. 1 is configured to include a cooling dehumidifier 51 as the dehumidifying mechanism 5. As a cooling heat source in the cooling dehumidifier 51, the evaporator 33 in the heat pump unit 30 uses a refrigerant and The heat source water W having a lowered temperature due to heat exchange between the two is provided.

First, the components of the drying system S will be described in detail. As the dryer 1, a fluidized bed dryer is applied as an example. This apparatus is subjected to a drying process in one section in the fluidized chamber 10, and is covered. In this type of apparatus, the dried product is cooled in a separate compartment in the fluidizing chamber 10 and then discharged. For this reason, a flow chamber 10 is formed inside the casing, and a dam plate 12 is erected on a vent plate 11 provided substantially horizontally in the flow chamber 10, and the dam plate 12 is placed on the vent plate 11. The space is divided into a drying area and a cooling area.
When the material to be dried H is introduced into the fluid chamber 10 from the inlet 15 and the dry air Ad is introduced from the air supply port 13, a fluidized layer of the material to be dried H is formed on the ventilation plate 11. Yes, the material to be dried H is gradually deprived of moisture, then moves over the weir 12 and moves to the cooling area. Then, the object to be dried is cooled by the cooled air Ac introduced from the air supply port 14, and is eventually taken out from the discharge port 17 to the outside.
On the other hand, the dry air Ad and the cooled air Ac are exhausted from the exhaust port 16 to the outside.

  Next, the heat pump unit 30 provided in the temperature raising mechanism 3 will be described. This device is for raising the temperature of the dehumidified air Ah to be the temperature raised air At, and includes a condenser 31, an expansion valve 32, and evaporation. The device 33 and the compressor 34 are provided to form a heat pump cycle. In this embodiment, carbon dioxide as a refrigerant is used as an example, and the temperature of the heated air At raised in the heat pump unit 30 can be about 100 to 120 ° C. . Incidentally, in addition to carbon dioxide, when a heat pump unit 30 having an equivalent performance using other refrigerants is put into practical use in the future, this can be adopted. In the figure, the flow path of the heat source water W of the heat pump unit 30 is indicated by a double line, while the flow path of the outside air A0 is indicated by a single line.

  Next, the cooling dehumidifier 51 as the dehumidifying mechanism 5 will be described. This device is for dehumidifying the outside air A0 to obtain dehumidified air Ah. In this embodiment, as an example, a fin tube heat exchanger, an air-cooled type A heat exchanger, a direct contact heat exchanger, etc. are adopted.

  Next, the temperature raising device 6 will be described. This device is for further raising the temperature raising air At to dry air Ad. In this embodiment, as an example, a fin tube heat exchanger, an electric heater, A direct furnace is used.

  Next, the exhaust heat recovery device 7 will be described. This device is used to raise the temperature of the heat source water W, and in this embodiment, a finned tube heat exchanger, a plate heat exchanger, or the like is adopted as an example. .

These devices are connected as shown in FIG. 1, and outside air A0 (35 ° C.) sucked by a blower or the like (not shown) is first connected to the low temperature heat source water W2 in the cooling dehumidifier 51. Then, heat is exchanged and the temperature is lowered to dehumidify and is sent to the heat pump unit 30 as dehumidified air Ah (20 to 25 ° C.). A part of the dehumidified air Ah is supplied as cooled air Ac to the air supply port 14 in the dryer 1 and used for cooling the object to be dried.
Next, the dehumidified air Ah is heat-exchanged with the refrigerant in the condenser 31 of the heat pump unit 30 to increase the temperature, and is sent to the temperature raising device 6 as the temperature raising air At (100 to 120 ° C.).
Next, the temperature raising air At is heated in the temperature raising device 6 with boiler steam or hot air generated in a direct-fired furnace, and the temperature is raised to obtain drying air Ad (130 ° C. or higher) in the dryer 1. It is supplied to the air supply port 13 and used for drying the object to be dried.

  In the dryer 1, the material to be dried is dried by the action of the dry air Ad, then cooled by the cooled air Ac, and then discharged as a dry product having a desired moisture value. At this time, since the cooled air Ac is kept at a low humidity even under conditions where the humidity of the outside air A0 is high as in the season from spring to autumn, the dried product in a desired dry state can be stably supplied. Can be obtained.

  Here, the thermal cycle of the heat source water W provided in the heat pump unit 30 will be described. The low-temperature heat source water W2 (10 to 15 ° C.) whose temperature has decreased by exchanging heat with the refrigerant in the evaporator 33 is The cooling dehumidifier 51 serves as a cooling heat source. At this time, the heat of the outside air A0 is taken into the low temperature heat source water W2 to become the high temperature heat source water W1 (20 ° C.). The high-temperature heat source water W1 is sent again to the evaporator 33 in the heat pump unit 30 via the tank 8, and is used for raising the temperature of the dehumidified air Ah. For this reason, the dried product made into the desired dry state can be obtained stably and at low cost.

  If the heat source water has insufficient heat, the exhaust heat recovery unit 7 allows heat to be taken into the heat source water W from the exhaust gas of the drying system S or peripheral equipment, scrubber water, etc. It can be compensated by supplying. For this reason, the operation | movement by the further low running cost is attained by the improvement of the energy efficiency of the drying system S whole.

[Example 2]
Next, the drying system S shown in FIG. 2 will be described. The drying system S is configured to include a desiccant dehumidifier 52 as the dehumidifying mechanism 5, and when supplying the outside air A0 dehumidified by the desiccant dehumidifier 52 to the heat pump unit 30, the temperature is set. The cooler 9 is provided to reduce the temperature to a temperature range suitable for the operation of the heat pump unit 30. And as the cold heat source in this cooler 9, it is comprised so that the heat source water W which temperature fell by performing heat exchange between refrigerant | coolants in the evaporator 33 in the said heat pump unit 30 may be provided.
Incidentally, such a configuration is realized by modifying the desiccant dehumidifier 52 to be positioned before the cooling dehumidifier 51 in the drying system S shown in FIG. It is something that can be done.
In the heat pump unit 30, if the temperature of the gas to be heated (here, the outside air A 0) is high, the operation efficiency of the heat pump unit 30 is reduced, and therefore, a temperature suitable for the operation of the heat pump unit 30. In this state, the gas to be heated (outside air A0) is introduced into the heat pump unit 30.

The desiccant dehumidifier 52 will now be described. The desiccant dehumidifier 52 performs dehumidification by passing a dehumidified gas through a dehumidifying element 521 containing a dehumidifying agent such as zeolite, activated carbon, or silica gel. The dehumidifying element 521 that has adsorbed moisture is regenerated by hot air supplied by a blower or the like (not shown). The dehumidifying element 521 includes a heat exchanger 522 for generating the hot air, and rotates the dehumidifying element 521. Thus, the dehumidifying agent that has adsorbed moisture is exposed to hot air so that regeneration is performed. The hot air used for the regeneration of the dehumidifying element 521 can be used as a heat source for the temperature raising device 6 and the exhaust heat recovery device 7.
As an example of the heat exchanger 522, a fin tube heat exchanger, a plate heat exchanger, or the like is employed. Of course, the outside air A0 may be heated by an electric heater or the like instead of the heat exchanger 522.

The outside air A0 (35 ° C.) sucked by a blower or the like (not shown) is first dehumidified by the desiccant dehumidifier 52 and becomes dehumidified air Ah (50 ° C.) in a state of being heated by moisture adsorption heat. Sent to 9.
In the cooler 9, the dehumidified air Ah undergoes heat exchange with the low-temperature heat source water W <b> 2 discharged from the evaporator 33, the temperature decreases, and is sent to the heat pump unit 30 as cooled air Ac (40 ° C. or lower). . A part of the cooled air Ac is supplied to the air supply port 14 in the dryer 1 and used for cooling the object to be dried.
Next, in the condenser 31 of the heat pump unit 30, the cooled air Ac is subjected to heat exchange with the refrigerant, the temperature thereof is increased, and the heated air At (100 to 120 ° C.) is sent to the temperature raising device 6.
Next, in the temperature raising device 6, the temperature raising air At is subjected to heat exchange with boiler steam or hot air generated in a direct furnace and the like, and the temperature is raised to obtain drying air Ad (130 ° C. or higher) in the dryer 1. It is supplied to the air supply port 13 and used for drying the object to be dried.

  In the dryer 1, the material to be dried is dried by the action of the dry air Ad, then cooled by the cooled air Ac, and then discharged as a dry product having a desired moisture value. At this time, since the cooled air Ac is kept at a low humidity even under conditions where the humidity of the outside air A0 is high as in the season from spring to autumn, the dried product in a desired dry state can be stably supplied. Can be obtained.

Here, the thermal cycle of the heat source water W provided in the heat pump unit 30 will be described. The low-temperature heat source water W2 (10 to 15 ° C.) whose temperature has decreased by exchanging heat with the refrigerant in the evaporator 33 is As described above, the cooler 9 serves as a cold heat source. At this time, the low temperature heat source water W2 takes in the heat of the dehumidified air Ah and is heated (20 ° C.).
Then, the temperature of the high-temperature heat source water W <b> 1 is increased in the cooler 9 and is sent again to the evaporator 33 in the heat pump unit 30 via the tank 8 and is used for increasing the temperature of the cooled air Ac. For this reason, the dried product made into the desired dry state can be obtained stably and at low cost.

Example 3
Next, the drying system S shown in FIG. 3 will be described. The drying system S is configured to dehumidify the outside air A0 heated by the heat pump unit 30 by a desiccant dehumidifier 52, and is used for the regeneration of the dehumidifying element 521 of the desiccant dehumidifier 52 (hygroscopic air Ar). A cooler 523 for lowering the temperature is provided, and a heat source water whose temperature is lowered by exchanging heat with the refrigerant in the evaporator 33 in the heat pump unit 30 as a cold heat source in the cooler 523. It is configured to provide W.
Incidentally, in such a configuration, the desiccant dehumidifier 52 is positioned between the heat pump unit 30 and the temperature raising device 6 in the drying system S shown in FIG. 1, and the dehumidifying element 521 is regenerated in the cooling dehumidifier 51. It can be realized by being modified so as to function as a cooler 523 for cooling the hygroscopic air Ar, and to supply the outside air A0 directly to the condenser 31 in the heat pump unit 30.

And outside air A0 (35 degreeC) attracted | sucked by the blower etc. (illustration omitted) first heat-exchanges with a refrigerant | coolant in the condenser 31 of the heat pump unit 30, a temperature rises, and temperature rising air At (60 ˜80 ° C.) to the desiccant dehumidifier 52.
The temperature raising air At is dehumidified in the desiccant dehumidifier 52 and is sent to the temperature raising device 6 as dehumidified air Ah (100 to 120 ° C.) in a state of being heated by moisture adsorption heat.
The dehumidified air Ah is heated in the temperature raising device 6 with boiler steam or hot air generated in a direct-fired furnace, and the temperature is raised, and the air supplied to the dryer 1 as dry air Ad (130 ° C. or higher). It is supplied to the mouth 13 and used for drying the material to be dried.
In the dryer 1, the material to be dried is dried by the action of the dry air Ad, and then cooled by the cooled air Ac described in detail later, and then discharged as a dry product having a desired moisture value. is there.

Here, the thermal cycle of the heat source water W provided in the heat pump unit 30 will be described. The low-temperature heat source water W2 (10 to 15 ° C.) whose temperature has decreased by exchanging heat with the refrigerant in the evaporator 33 is As described above, the cooler 523 serves as a cold heat source. At this time, the low-temperature heat source water W2 takes in the heat of the hygroscopic air Ar and is heated (20 ° C.). On the other hand, the hygroscopic air Ar is exhausted in a state where the temperature is lowered. However, a part or all of the hygroscopic air Ar is introduced as cooled air Ac into the air supply port 14 of the dryer 1 and used for cooling the dried object to be dried. You can also.
Then, the high-temperature heat source water W1 whose temperature has been raised in the cooler 523 is sent again to the evaporator 33 in the heat pump unit 30 via the tank 8, and is used for raising the temperature of the outside air A0. For this reason, the dried product made into the desired dry state can be obtained stably and at low cost.
Further, since the ambient temperature outside air A0 is supplied to the heat pump unit 30 and the outside air A0 is heated, the heat pump unit 30 can be operated under favorable conditions.
Furthermore, the dehumidifying element 521 of the desiccant dehumidifier 52 heats the outside air A0 by the heat exchanger 522 and introduces it into the dehumidified dehumidifying element 521, whereby the dehumidifying element 521 is dehumidified, and the dehumidifying element 521 is heated again. It is used for dehumidification of air At.
As the heat exchanger 522, for example, a fin tube heat exchanger, a plate heat exchanger, or the like is employed. Of course, the outside air A0 may be heated by an electric heater or the like instead of the heat exchanger 522.
The hygroscopic air Ar that has taken in moisture from the dehumidifying element 521 is introduced into the cooler 523, and the hygroscopic air Ar is cooled to become cooled air Ac.
Since the low temperature heat source water W2 supplied to the heat exchanger 522 as a cold heat source becomes the high temperature heat source water W1 and heat can be taken into the heat source water W, by using this heat for raising the outside air A0 in the heat pump unit 30, The drying system S can be operated with high energy efficiency.

DESCRIPTION OF SYMBOLS S Drying system 1 Dryer 10 Flow chamber 11 Ventilation plate 12 Weir plate 13 Air supply port 14 Air supply port 15 Input port 16 Exhaust port 17 Exhaust port 2 Air supply mechanism 3 Temperature rising mechanism 30 Heat pump unit 31 Condenser 32 Expansion valve 33 Evaporator 34 Compressor 5 Dehumidifying mechanism 51 Cooling dehumidifier 52 Desiccant dehumidifier 521 Dehumidifying element 522 Heat exchanger 523 Cooler 6 Heating device 7 Waste heat recovery device 8 Tank 9 Cooler A0 Outside air Ac Cooled air Ad Dry air Ah Dehumidified air Ar Absorbed air At Heated air H Dried object W Heat source water W1 Heat source water W2 Heat source water

Claims (7)

  In a drying system provided with a dryer and an air supply mechanism for supplying dry air to the dryer, the air supply mechanism includes a temperature raising mechanism for raising the temperature of the outside air and a dehumidification of the outside air. The dehumidifying mechanism is configured to perform temperature rise and dehumidification of the outside air, and the temperature raising mechanism includes a heat pump unit, and in the heat pump unit Heat can be taken into the heat source water by using the heat source water whose temperature has been reduced by exchanging heat with the refrigerant in the evaporator as a cold heat source for other components in the air supply mechanism. A drying system provided with a dehumidifying mechanism for dry air.   The dehumidifying mechanism is configured to include a cooling dehumidifier, and as a cooling heat source in the cooling dehumidifier, a heat source whose temperature is reduced by exchanging heat with a refrigerant in an evaporator in the heat pump unit. The drying system provided with a dehumidifying mechanism for dry air according to claim 1, wherein water is provided.   The dehumidifying mechanism is configured to include a desiccant dehumidifier, and includes a cooler for lowering the temperature when the outside air dehumidified by the desiccant dehumidifier is supplied to the condenser in the heat pump unit. The heat source water having a reduced temperature by heat exchange with the refrigerant in the evaporator in the heat pump unit is provided as a cooling heat source in the cooler. Drying system with dehumidifying mechanism of dry air.   The dehumidifying mechanism is configured to include a desiccant dehumidifier, and is configured to dehumidify the outside air heated by the condenser in the heat pump unit by the desiccant dehumidifier, and the dehumidifying element of the desiccant dehumidifier A cooler for lowering the temperature of hot air supplied for regeneration is provided, and the temperature is lowered by performing heat exchange with the refrigerant in the evaporator of the heat pump unit as a cooling heat source in the cooler. The drying system provided with the dehumidifying mechanism for dry air according to claim 1, wherein the heat source water is provided.   The dry air according to claim 2, 3 or 4, wherein the air supply mechanism is provided with a mechanism for supplying outside air cooled by a cooling dehumidifier or a cooler to the dryer. Drying system with dehumidification mechanism.   The air supply mechanism is provided with a temperature raising device for raising the temperature of the outside air dehumidified by the dehumidifying mechanism while being heated by the temperature raising mechanism. A drying system provided with the dehumidifying mechanism for dry air according to 3, 4, or 5.   7. The drying system provided with a dehumidifying mechanism for dry air according to claim 1, wherein the heat pump unit uses carbon dioxide as a refrigerant.

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