JP2022045733A - Dehumidification system - Google Patents

Abstract

To provide a dehumidification system in which downsizing may be attained, and there is no need to prepare a separate heat source for regenerative heating near the system.SOLUTION: A part of a main flow path 24 through which low-temperature and high-humidity air flows from a manned painting booth 20 is extracted, dehumidified by a dehumidification device 40, and then returned to the main flow path 24 from a return flow path 32 for mixing. The temperature and humidity of the mixed air are finely adjusted by a cooler 50 and a heater 60. After that, the air with adjusted temperature and humidity is supplied to an unmanned painting booth 10. The dehumidification device 40 is a non-rotating type and does not require a rotary drive device such as a motor.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dehumidifying system that dehumidifies air and supplies it to a predetermined space.

For example, when it comes to painting the body of a vehicle such as an automobile, the temperature and humidity have been adjusted for exclusive use in view of the deterioration of the working environment in the painting room, which is called the painting booth, and the deterioration of the quality of painting due to the mist of paint. It is done in the painting room.

In order to maintain the temperature and humidity in a predetermined space such as a painting booth within a desired range, a cooler is used to lower the temperature of the air to remove moisture in the air, and then the heater is used to heat the air. It is common to raise the temperature of air, but it requires a lot of cooling energy and heating energy.

Therefore, in the past, part of the humid air exhausted from the painting booth for painting by spraying paint on the object to be coated while flowing air-conditioned air in a certain direction was recovered, and the temperature and humidity of the recovered humid air. There is also one that adjusts the air to be sent to the painting booth again. In adjusting (dehumidifying) the humidity, not only dehumidification by a cooler but also a circulating air dehumidifying means equipped with a desiccant rotor may be used (Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-121783

However, the above-mentioned desiccant rotor requires a rotary drive device such as a motor that rotates the rotor, and a heat source for heating the regeneration zone is required near the desiccant rotor. There was room.

The present invention has been made in view of this point, and an object of the present invention is to provide a dehumidifying system that can be made smaller than the conventional one and that does not require a separate heat source for heating for regeneration.

In order to achieve the above object, the present invention is a dehumidifying system that dehumidifies air and supplies it to a predetermined space. An adsorbent that has been stored and dried by exhaust heat is housed in a casing, and air is supplied to the adsorbent. It has a non-rotating dehumidifying device that dehumidifies the air by passing it through, and a part of the raw material air for supplying to the predetermined space is extracted from the flow path, dehumidified by the dehumidifying device, and then the flow path. The dehumidified air is mixed with the remaining raw material air of the raw material air, and the mixed air is supplied to the predetermined space.

According to the present invention, there is a non-rotating dehumidifying device in which an adsorbent that has been stored and dried by exhaust heat is housed in a casing, and a part of it is extracted from a flow path of raw material air for supplying to a predetermined space. After dehumidifying with the dehumidifying device, the air was returned to the flow path to mix the dehumidified air with the remaining raw material air of the raw material air, and the mixed air was supplied to the predetermined space. First, unlike a rotary dehumidifier such as a desiccant rotor, a rotating device such as a motor is not required, and the equipment associated with it is not required. In addition, since a part of the raw material air is extracted from the flow path to dehumidify it and then mixed with the remaining raw material air, it is possible to make the duct area and the required fan compact compared to the case of dehumidifying the entire amount. be. Furthermore, unlike the desiccant rotor, it is not necessary to provide a heating device for regeneration in the vicinity of the rotor, so that the system as a whole can be miniaturized. In addition, the equipment to be added is compact and only needs to be connected to the main air conditioning line, so there is the advantage that the installation layout can be set freely.

Further, it has a cooler for cooling air and a heater for heating air, and supplies the mixed air to the predetermined space after adjusting the temperature and humidity by the cooler and the heater. You may do it. This makes it possible to finely adjust the temperature and humidity even when the predetermined space requires strict temperature and humidity adjustment.

In such a case, the dehumidifying and raising capacity of the dehumidifying device has a greater ability to adjust the temperature and humidity required for the air supplied to the predetermined space than the dehumidifying and raising capacity of the cooler and the heater. Is preferable. As a result, the energy input to the cooler and the heater can be suppressed in adjusting the temperature and humidity required for the air supplied to the predetermined space.

Here, the ability to adjust the temperature and humidity required for the air supplied to a predetermined space is large, for example, the dehumidifying capacity and the raising capacity per unit time and per unit flow rate are determined by the cooler and the heater. It is larger than the dehumidifying capacity and the heating capacity.

The mixing ratio of the dehumidified air and the remaining raw material air of the raw material air may be changed based on the performance change of the adsorbent. When dehumidifying with heat storage and dry adsorbent, the adsorption performance deteriorates with the passage of operation time, but by changing the mixing ratio, the humidity supplied to the predetermined space can be maintained at the desired value and range. It is possible.

A return flow set on the downstream side of the flow path for connecting to the flow path through which the raw material air flows and for extracting a part thereof, and for returning the dehumidified air to the flow path. It may have a connecting portion of the road, and the outlet of the return flow path may be directed to the downstream side from the connecting portion of the return flow path in the flow path. Further, the same effect can be obtained by directing the inlet of the extraction flow path toward the upstream side from the connection portion, and even if the flow flows back to the upstream side, it is prevented from being mixed and extracted.

With such a configuration, even if the connection portion of the extraction flow path and the connection portion of the return flow path are brought close to each other, the dehumidified air from the return flow path flows back to the upstream side and is mixed. After that, it is prevented from being extracted from the extraction flow path again.

Furthermore, from the same viewpoint, a rectifying member is provided in the flow path so that the dehumidified air flowing out from the outlet of the return flow path into the flow path does not flow back to the upstream side in the flow path. May be.

Even if such a rectifying member is provided, even if the connection portion of the extraction flow path and the connection portion of the return flow path are brought close to each other, the dehumidified air from the return flow path flows back to the upstream side and is mixed. After that, it is prevented from being extracted from the extraction flow path again. In such a case, it may be used in combination with the direction of the outlet of the return flow path.

According to the present invention, it is possible to make the size smaller than before, and it is not necessary to separately prepare a heat source for heating for regeneration nearby.

It is explanatory drawing which showed the outline of the structure of the recycling system of the automobile painting booth which adopted the dehumidifying system which concerns on embodiment. FIG. 3 is a cross-sectional view showing a connection state between a flow path for extraction and a main flow path of a flow path for return in the dehumidification system of FIG. It is explanatory drawing which showed the outline of the structure of the dehumidifying apparatus in the dehumidifying system of FIG.

Hereinafter, the embodiment will be described. FIG. 1 shows an outline of the configuration of the recycling system 1 of the painting booth for automobiles to which the dehumidifying system D according to the embodiment is applied, and the dehumidifying system D is a predetermined space. The unmanned painting booth 10 is configured to supply mixed air of dehumidified air and raw material air.

The unmanned painting booth 10 is connected to the manned painting booth 20. These unmanned painting booths 10 and manned painting booths 20 are areas for applying paint to the body 2 of an automobile using paint in the booth, and after the primary painting is performed in the manned painting booth 20, the unmanned painting booth 10 Secondary painting is applied at. In each booth, a water spray shower for collecting mist is carried out in order to collect floating paint mist.

In order to maintain the atmosphere in the booths at a predetermined temperature and humidity in both the unmanned painting booth 10 and the manned painting booth 20, the temperature and humidity are monitored by the temperature sensors 11 and 21 and the humidity sensors 12 and 22. The temperature / humidity signal from each of these sensors is output to the control device C described later. The painting line to which this embodiment is applied has a manned painting booth 10 and an unmanned painting booth 20 as described above, but of course, the painting line to which the present invention is applied has a manned or unmanned painting booth. It doesn't matter.

The air supply whose temperature and humidity are adjusted by an air conditioner (not shown) provided separately is supplied to the manned painting booth 20 where the primary painting is performed through a flow path 23 such as a duct. The humid air exhausted from the manned painting booth 20 is discharged from the main flow path 24 to the outside of the booth, and then mixed with the air dehumidified by the dehumidifying device 40 of the dehumidifying system D described later, and the unmanned painting booth 10 Is supplied to. Such exhaust from the manned painting booth 20 and air supply to the unmanned painting booth 10 are performed by, for example, two fans 25 and 26 provided in the main flow path 24.

The dehumidification system D according to the embodiment is configured to take out a part of the exhaust gas from the manned painting booth 20 which is the raw material air from the main flow path 24, dehumidify the taken out raw material air, and then return it to the main flow path 24. ing. Hereinafter, the dehumidification system D will be described in detail.

The dehumidifying system D includes a flow path 31 for extraction (hereinafter, may be simply referred to as a flow path 31) composed of ducts, pipes, etc. for extracting a part of raw material air from the main flow path 24, and a dehumidifying device 40. It has a return flow path 32 (hereinafter, may be simply referred to as a flow path 32) for returning the dehumidified air to the main flow path 24. The flow path 31 is provided with a flow meter 33, a fan 34 for extracting a part of raw material air from the main flow path 24 and supplying it to the dehumidifying device 40, and a thermo-hygrometer 35, and the flow path 31 is an inlet of the dehumidifying device 40. It is connected to the side. The fan 34 can be controlled by an inverter.

One end of the flow path 32 is connected to the outlet side of the dehumidifying device 40. The flow path 32 is provided with a thermo-hygrometer 36 and a filter 37. The other end of the flow path 32 is connected to the main flow path 24. The specific state of connection is as shown in FIG. That is, the flow path 31 for extraction is normally connected to the main flow path 24, but the outlet 32a of the flow path 32 for return enters the main flow path 24 and is on the downstream side of the main flow path 24. Is aimed at.

The dehumidifying device 40 described above has the configuration shown in FIG. That is, the dehumidifying device 40 vertically partitions the casing 41 with a breathable partition plate, for example, a member having ventilation, for example, a punching metal, and fills the space between them with the adsorbent M. Have. An upper space 43 and a lower space 44 are formed above and below the filling portion 42. On the other hand, the flow path 31 is branched into two upper and lower flow paths 31a and 31b. The branch flow path 31a communicates with the upper space 43, and the branch flow path 31b communicates with the lower space 44. The branch flow paths 31a and 31b are provided with corresponding valves 31c and 31d.

Further, one end of the flow path 32 is divided into two upper and lower branch flow paths 32a and 32b. The branch flow path 32a communicates with the upper space 43, and the branch flow path 32b communicates with the lower space 44. The branch flow paths 32a and 32b are provided with corresponding valves 32c and 32d.

With the above configuration, the raw material air flowing from the extraction flow path 31 can be introduced into the upper space 43 or the lower space 44 by switching the valves 31c and 31d, and can be used for one-sided return. As for the flow path 32, the air in the upper space 43 or the lower space 44 can be led out to the flow path 32 by switching the valves 31c and 31d.

As a result, the raw material air flowing from the extraction flow path 31 is introduced into the upper space 43, and the adsorbent M is passed through to dehumidify, and is led out from the lower space 44 to the return flow path 32. Or by reversing the flow, the raw material air flowing from the extraction flow path 31 is introduced into the lower space 44, and the adsorbent M is passed through to dehumidify, and then returned through the upper space 43. It is possible to derive from the flow path 32 for.

In the embodiment, for example, a granulated adsorbent is used as the adsorbent M. A known adsorbent such as silica gel or zeolite can be used as this adsorbent, and a granulated body of the adsorbent having desired performance such as ventilation resistance and heat / material transfer can be used as an adsorbent having a heat storage function. Can be used. In such a case, a composite composed of amorphous aluminum silicate and low crystalline clay, for example, Hasclay (registered trademark) or a low-temperature regenerative adsorbent for a polymer sorbent is a conventional adsorbent (silica gel, zeolite, etc.). It is suitable for the present invention as an adsorbent having a high-density heat storage function because it can adsorb water vapor in a wider humidity range.

In such a case, the dehumidifying and raising capacity of the adsorbent M is adjusted to the temperature and humidity required for the air supplied to the unmanned painting booth 10 rather than the dehumidifying capacity of the cooler 50 and the raising capacity of the heater 60 described later. It is preferable that the capacity is large. As a result, when adjusting the air supplied to the unmanned painting booth 10 to the required temperature and humidity, the energy input to the cooler 50 and the heater 60 can be suppressed, and the energy saving effect can be enhanced.

Further, it is preferable that the adsorbent M is stored and dried in advance before the dehumidifying device D is installed in the recycling system 1 of the painting booth. That is, since the dehumidifying device 40 has a simple configuration in which the adsorbent M is filled in the casing 41 having no rotary drive device such as a motor, it can be easily installed in the recycling system 1 of the painting booth, and depending on the vehicle or the like. It can be transported. Therefore, for example, it is possible to heat the adsorbent M at a place away from the painting booth to store heat and dry it, and then install it at a predetermined position in the recycling system 1 of the painting booth. Further, since the adsorbent M can be stored and dried at a place away from the painting booth, for example, in a place where waste heat is generated such as a factory, the adsorbent M is heated by the waste heat to store and dry. Therefore, the energy saving effect is extremely high. The heat source is not limited to such waste heat, and may be obtained from, for example, solar heat.

Of course, if there is a heat source such as waste heat near the painting booth, after installing the dehumidifying device 40, from the heat source near the painting booth to the adsorbent M housed in the dehumidifying device 40 by a duct or the like. Heat may be supplied to store and dry the heat so that the adsorption function can be exerted.

The extraction flow path 31 and the return flow path 32 are connected between the filters 27 and 28 provided in the main flow path 24. A temperature sensor 29 is provided on the outlet side of the fan 25.

On the downstream side of the connection portion of the return flow path 32 in the main flow path 24, a cooler 50 for cooling the air flowing in the main flow path 24 and a heater 60 for heating the air cooled by the cooler 50 are provided. ing.

In the present embodiment, the cooler 50 is a cooling coil, for example, cooling water is introduced into the cooling coil from the outbound pipe 52 by a pump 51, heat is exchanged with the air in the main flow path 24, and then cooled from the return pipe 53. Returned to the water source (not shown). The outgoing pipe 52 is provided with a temperature sensor 54 on the inlet side, and the return pipe 53 is provided with a temperature sensor 55 on the outlet side.

The heater 60 is a heating coil. For example, hot water is introduced into the heating coil from the outgoing pipe 62 by a pump 61, exchanges heat with air in the main flow path 24, and then from the return pipe 63 to a hot water source (not shown). Is returned. The outgoing pipe 62 is provided with a temperature sensor 64 on the inlet side, and the return pipe 63 is provided with a temperature sensor 65 on the outlet side.

Then, the air whose temperature and humidity are adjusted through the cooler 50 and the heater 60 is supplied to the unmanned painting booth 10 by the fan 26 through the main flow path 24. Further, the atmosphere inside the unmanned painting booth 10 is exhausted from the exhaust flow path 72 to the outside of the system by the exhaust fan 71.

The control device C is configured to control various members and devices in the dehumidification system D. For example, it is possible to control the air volume of the fans 25, 26, 34, switch the valves 31c, 31d, 32c, 32d, control the temperature of the cooler 50, and control the temperature of the heater 60. Regarding the indicators for control, for example, the temperature sensor 11 in the unmanned painting booth 10, the humidity sensor 12, the temperature sensor 29 in the main flow path 24, the flow meter 33 in the flow path 31 for extraction, the temperature / humidity meter 35, and the return It is configured to control each of the above-mentioned members and devices based on a combination of the data from the thermo-hygrometer 36 in the flow path 32. As for the control in such a case, PID control and feedforward control are carried out according to the conditions and the control target.

The dehumidifying system D according to the embodiment and the recycling system 1 of the automobile painting booth adopting the dehumidifying system D are configured as described above, and the body 2 of the automobile to be painted is first a manned painting booth 20. The primary coating is applied, and then the coating is transferred to the unmanned coating booth 10 for secondary coating.

The air exhausted from the unmanned painting booth 10 is cold and humid due to the sprayed paint recovery mist. This low-temperature and high-humidity air (raw material air) flows through the main flow path 24 and is first purified by the filter 27. Then, as shown in FIG. 2, a part of the purified air is supplied to the dehumidifying device 40 via the extraction flow path 31.

In the dehumidifying device 40, as shown in FIG. 3, the low-temperature and high-humidity air (raw material air) sent from the flow path 31 is introduced into, for example, the upper space 43, and the adsorbent M filled in the filling portion 42. Passes through and flows to the lower space 44. At this time, since the adsorbent M filled in the filling portion 42 has been previously stored and dried, the moisture in the low-temperature and high-humidity air is removed and the temperature rises. The air dehumidified by the adsorbent M in this way is purified through the filter 37 and then returned to the main flow path 24, and is mixed with the low-temperature and high-humidity air after a part of the air is blown out in the main flow path 24. Will be done.

At this time, the flow path 31 for extraction is normally connected to the main flow path 24, but the outlet 32a of the return flow path 32 enters the main flow path 24 and is on the downstream side of the main flow path 24. Even if the extraction flow path 31 and the return flow path 32 are brought close to each other and connected to the main flow path 24, the dehumidified air flowing from the flow path 32 is directed to the upstream side. It does not flow back and mix with cold and humid air. Therefore, the connection portion of the flow path 31 for extraction and the flow path 32 for return to each main flow path 24 can be brought close to each other. For example, the distance L between the extraction flow path 31 and the return flow path 32 shown in FIG. 2 can be shortened.

As a result, it is possible to make the duct circumference and the piping circumference of the extraction flow path 31 and the return flow path 32 with respect to the main flow path 24 compact. Further, in combination with the configuration of the non-rotating type dehumidifying device 40 described above, the dehumidifying system D itself can be miniaturized. Therefore, it is easy to apply to the existing equipment.
Further, although it is a reasonable scale to significantly reduce the humidity by using a dehumidifying device equipped with a conventional cooling coil and a desiccant rotor, in the present embodiment, the dehumidifying equipment required for the recycling system 1 is extremely compact. It has become. That is, in the case of the conventional cooling coil, it is necessary to increase the size of the coil itself, and in the case of the desiccant rotor, there is a problem of mixed flow, and it is necessary to greatly increase the size because it is necessary to reduce the pressure loss on the heat storage material. .. On the other hand, in the present embodiment, since the dehumidification efficiency is higher than that of the conventional equipment, the scale of the equipment can be significantly reduced, so that the equipment can be made much more compact than the conventional equipment.

A rectifying member such as a rectifying plate or an obstruction plate is provided in the main flow path 24 so that the dehumidified air flowing out from the outlet 32a of the return flow path 32 into the main flow path 24 does not flow back to the upstream side in the main flow path 24. It may be provided. By providing such a rectifying member, even when the extraction flow path 31 and the return flow path 32 are brought close to each other, the dehumidified air from the return flow path 32 flows back and is extracted. It is possible to prevent the air from being mixed with the low temperature and high humidity air which is the raw material air upstream of the flow path 31. Further, by shortening the distance L between the flow path 31 for extraction and the flow path 32 for return, the ducts and pipes of the flow path 31 for extraction and the flow path 32 for return with respect to the main flow path 24 are made compact. It is possible to. Of course, a rectifying member may be further added from the example shown in FIG.

The high temperature and low humidity air flowing from the return flow path 32 and the low temperature and high humidity raw material air are mixed in the main flow path 24, and then the humidity is adjusted by the cooler 50. After that, the temperature is adjusted by the heater 60 on the downstream side. The air whose temperature and humidity have been adjusted in this way is supplied to the unmanned painting booth 10 by the fan 26. In this embodiment, since the fan 26 is separately provided on the downstream side of the fan 25, the low temperature and high humidity air which is the raw material air and the high temperature and high humidity air after dehumidification are agitated in the main flow path 24. Is possible. Therefore, the air supplied to the unmanned painting booth 10 is an air supply with no bias in temperature and humidity, which is suitable for painting in the booth.

Due to the nature of the adsorbent M housed in the dehumidifying device 40, the adsorbing performance may deteriorate with the lapse of operating time. In order to deal with this, in the dehumidifying system D according to the present embodiment, for example, the following measures can be taken.

[Switch flow path]
For example, as shown in FIG. At the beginning of the operation, the raw material air partially extracted from the main flow path 24 was made to flow through the adsorbent M from the upper space 43 to the lower space 44 in the dehumidifying device 40, but the adsorbent M is layered. Since they are stacked, the closer to the upper space 43, the greater the deterioration in performance, and the closer to the lower space 44, the smaller the deterioration in performance. Therefore, if the valves 31c and 31d on the introduction side and the valves 32c and 32d on the lead-out side are switched to introduce the raw material air from the lower space 44 and pass through the adsorbent M to flow into the upper space 43, the performance can be achieved. Can be treated against the decline in.

[Change in mixing ratio]
When the adsorption performance of the adsorbent M deteriorates, the amount of raw material air from the main flow path 24 is extracted accordingly, a larger amount of air is dehumidified, and the return flow path 32 returns to the main flow path 24 for mixing. By changing the mixing ratio, the absolute humidity after mixing can be maintained within a predetermined range. That is, as the adsorption performance of the adsorbent M deteriorates, the amount of air extracted from the extraction flow path is increased, the amount of air to be dehumidified is increased, and the mixing ratio with the raw material air after cooking is changed (extracted). By increasing the proportion of dehumidified air), the decrease in the adsorption performance of the adsorbent M can be compensated for.

Such control of the mixing ratio can be easily realized, for example, by controlling the extraction fan 34 with an inverter. Also such control. For example, the absolute humidity based on the detection results of the thermohygrometers 35 and 36 is controlled.
It can be proposed that feedforward control is performed for the fan 34 and PID control is performed for subsequent adjustments.

The dehumidification system D according to the above-described embodiment is applied to the unmanned painting booth 10 as a predetermined space, and the exhaust gas from the manned painting booth 20 is used as the raw material air. It can be applied not only to other spaces but also to other spaces. For example, in a large-scale clean room in a semiconductor manufacturing factory, in a process requiring humidity control, the raw material air may be used as return air from the clean room, and a part of the air may be extracted and dehumidified and mixed with the return air. good. In this case, a high-performance filter may be used for the filters 27, 28, and 37.

In addition, for spaces with particularly strict humidity and temperature / humidity control, such as drug manufacturing factories, food factories, and printing factories, a part of the return air and exhaust from the space is extracted and dehumidified, and then these return air and exhaust are used. It may be mixed and supplied to the space.

The present invention is useful for air conditioning in spaces that require humidity control in factories and the like.

1 Painting booth recycling system 2 Automotive body 10 Unmanned painting booth 20 Manned painting booth 24 Main flow path 25, 26, 34 Fans 27, 28, 37 Filter 31 Flow path for extraction 32 Flow path for return 33 Hygrometer 35, 36 Thermo-hygrometer 40 Dehumidifier 41 Casing 50 Cooler 60 Heater C Control device D Dehumidification system M Adsorbent

Claims (6)

A dehumidifying system that dehumidifies air and supplies it to a predetermined space.
It has a non-rotating dehumidifying device that dehumidifies the air by accommodating the adsorbent that has been stored and dried by exhaust heat in the casing and allowing air to flow through the adsorbent.
A part of the raw material air for supplying to the predetermined space is taken out, dehumidified by the dehumidifying device, and then returned to the flow path, and the dehumidified air and the remaining raw material air of the raw material air are mixed. death,
A dehumidifying system characterized in that the mixed air is supplied to the predetermined space. It has a cooler that cools the air and a heater that heats the air.
The dehumidifying system according to claim 1, wherein the mixed air is supplied to the predetermined space after adjusting the temperature and humidity by the cooler and the heater. The dehumidifying and raising capacity of the dehumidifying device adjusts the temperature and humidity required for the air supplied to the predetermined space after the mixing, rather than the dehumidifying and raising capacity of the cooler and the heater. The dehumidifying system according to claim 2, wherein the dehumidifying system is characterized by having a large capacity. The dehumidification according to any one of claims 1 to 3, wherein the mixing ratio of the dehumidified air and the remaining raw material air of the raw material air is changed based on the performance change of the adsorbent. system. A return flow set on the downstream side of the flow path for connecting to the flow path through which the raw material air flows and for extracting a part thereof, and for returning the dehumidified air to the flow path. Has a road connection and
The dehumidification system according to any one of claims 1 to 4, wherein the outlet of the return flow path is directed to the downstream side from the connection portion of the return flow path in the flow path. A return flow set on the downstream side of the flow path for connecting to the flow path through which the raw material air flows and for extracting a part thereof, and for returning the dehumidified air to the flow path. Has a road connection and
A rectifying member is provided in the flow path so that the dehumidified air flowing out from the outlet of the return flow path into the flow path does not flow back to the upstream side in the flow path. The dehumidifying system according to any one of claims 1 to 5.

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