JP3644122B2 - Air drying cooling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air drying and cooling device that gradually cools the atmosphere and cools it to below the freezing point in the final stage to prevent moisture in the air from freezing in the final stage.
[0002]
[Prior art]
As a large-capacity cooling device for drying and cooling the compressed high-temperature air, a multi-stage heat exchanger using various refrigerants is incorporated, the compressed air is gradually cooled, and the final installed on the outlet side Heat exchange with the refrigerant in the heat transfer tube as a heat exchanger and taking out as low-temperature air of 0 ° C. or less is considered advantageous for cooling the atmosphere to a sub-freezing level. As shown in an example in FIG. 5, a heat exchanger 4 using a relatively high-temperature ethylene glycol aqueous solution 5 as a refrigerant is provided inside a horizontal body 1 from the inlet 2 side at one end to the outlet 3 side at the other end. The heat exchanger 6 using the cooling water 7 as the refrigerant and the heat exchanger 8 using the relatively low-temperature ethylene glycol aqueous solution 9 as the refrigerant are arranged in multiple stages, and further, the final stage heat is provided on the outlet 3 side. Heat exchanger tube 10 as an exchanger is disposed The front position of the heat transfer tube 10, air drying cooling apparatus in which is disposed a spray device 11 for spraying toward ethylene glycol 12 to the heat transfer tube 10 is employed. 13 is a compressor.
[0003]
In the conventional air drying cooling apparatus, when the high-temperature compressed air A compressed by the compressor 13 is taken in from the inlet 2, it is first cooled when passing through the first stage heat exchanger 4, and then 2 After being cooled when passing through the heat exchanger 6 at the stage, it is cooled to about 0 ° C. to 10 ° C. when passing through the heat exchanger 8 at the third stage, and further when passing through the heat transfer tube 10. It is cooled to a sub-freezing level of −30 ° C. by heat exchange and taken out from the outlet 3.
[0004]
When the air cooled through the multi-stage heat exchangers 4, 6, 8 is brought into contact with the heat transfer tube 10 and cooled to a sub-freezing level, moisture in the air freezes and adheres to the surface of the heat transfer tube 10. As a result, icing occurs on the surface of the heat transfer tube 10, the interval between the heat transfer tubes becomes narrow, the flow path is blocked, and the heat transfer performance deteriorates.
[0005]
Therefore, in the conventional air drying and cooling device, before the heat transfer tube 10, the air that contacts the heat transfer tube 10 is dried by spraying ethylene glycol 12 from the spray device 11 onto the heat transfer tube 10.
[0006]
[Problems to be solved by the invention]
However, since the conventional air drying and cooling device is a horizontal type and has a spray device 11 for injecting ethylene glycol in front of the heat transfer tube 10 on the outlet side, the ethylene glycol injected from the spray device 11 is used. 12 may not reach within the body 1, and air and ethylene glycol cannot be sufficiently brought into contact with each other to effectively dehumidify, and there is a risk of icing on the surface of the heat transfer tube 10. Because it is a horizontal type, a large installation space was required.
[0007]
Therefore, the present invention prevents the air from being effectively dehumidified and dried to form icing on the heat transfer tube before it is cooled by heat exchange at the heat transfer tube portion, and the installation space can be reduced. It is an object of the present invention to provide such an air drying cooling device.
[0008]
[Means for Solving the Problems]
The present invention, in order to solve the above problems, in the lower part of the fuselage of the vertical having an outlet in and an upper end having an inlet for compressed air to the lower end, sequential compressed high temperature air was fed from the compressed air inlet Heat exchangers for heat exchange and cooling are arranged in multiple stages, and further, on the outlet side at the upper end in the fuselage, a heat transfer tube as a final stage heat exchanger for cooling the compressed air below freezing point is provided, In addition, before the heat transfer tube for cooling the compressed air to a sub-freezing level, ethylene glycol for dehumidifying the air is allowed to flow down in a curtain form and the rising compressed air is brought into contact through the ethylene glycol flowing down in a curtain form. A dehumidifier is provided , and the compressed air heat-exchanged by the multi-stage heat exchanger at the lower part of the fuselage is dehumidified and dried, and then guided to the heat transfer tube as the final-stage heat exchanger. Toss .
[0009]
As a result, the compressed air is brought into sufficient contact with ethylene glycol in the dehumidifier and effectively dehumidified in the previous stage of the heat transfer tube that cools to the sub-freezing level in the final stage. The air that is being dried is no longer icing on the heat transfer tubes.
[0010]
A dehumidifier configured to allow ethylene glycol to flow down in a curtain shape and to let the compressed air rising as it flows through the ethylene glycol flow down in the curtain shape to overflow the ethylene glycol from the opening in the center and flow down into the curtain shape. A first overflow plate; a second overflow plate that receives ethylene glycol flowing down from the first overflow plate and overflows from a peripheral portion to flow down in a curtain shape; and a tray that receives ethylene glycol flowing down from the second overflow plate With the configuration, the compressed air that rises up the ethylene glycol that overflows from the first overflow plate and the ethylene glycol that overflows from the second overflow plate From passing through with the line, dividing the air humidity is sufficiently performed.
[0011]
In addition, by providing a slit extending in the circumferential direction on one or both of the first overflow plate and the second overflow plate in the dehumidifier, the contact between ethylene glycol and air is increased and the dehumidifying effect is obtained. Can be increased.
[0012]
Further, a dehumidifier configured to allow ethylene glycol to flow down in a curtain shape and to let compressed air rising as it passes through the ethylene glycol flowing down in a curtain shape to have a peripheral portion as a perforated plate and a central portion of the ethylene glycol receiving portion. By using a plate comprising a plurality of slits extending in the circumferential direction and a receiving tray for receiving ethylene glycol flowing down from the receiving portion , the structure is simple and ethylene glycol and air Contact efficiency can be increased.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 and 2 show an embodiment of the present invention. The body 1 is arranged in a bowl shape so that one end is on the bottom and the other end is on the top, and the lower end is the inlet 2 and the upper end is the outlet 3. In the body 1, in the direction from the inlet 2 to the outlet 3, as in the case of the conventional cooling device shown in FIG. 5, an ethylene glycol aqueous solution or a propylene glycol aqueous solution 5 is used as a refrigerant, and a CaCl ₂ solution and a NaCl solution are used. Heat exchanger 4 that is conveyed as brine, heat exchanger 6 that uses cooling water 7 as a refrigerant, ethylene glycol aqueous solution 9 as a refrigerant, and heat exchange that uses CaCl ₂ solution and NaCl solution as brine In a configuration in which a plurality of heat transfer tubes 10 are arranged as a final stage heat exchanger on the outlet 3 side so that heat can be exchanged by the refrigerant flowing in the heat transfer tubes 10. , A dehumidifier 14 is provided between the heat transfer tube 10 and the heat exchanger 8 to remove moisture in the compressed air to be cooled and dry the compressed air.
[0015]
Although the dehumidifier 14 can have various configurations, FIGS. 1 and 2 show one form thereof, and the ethylene glycol 12 injected from the ethylene glycol injection pipe 15 receives the ethylene glycol 12 and overflows uniformly from the central portion. For this purpose, a first overflow plate 16 having a weir 18 provided around the central opening 17 is joined to the inner surface of the fuselage 1, and the first overflow plate 16 is positioned below the first overflow plate 16. A second overflow plate 19 provided with a weir 20 in the peripheral portion for receiving the ethylene glycol 12 overflowing from the central portion of the plate 16 and flowing down in a curtain shape to uniformly overflow from the peripheral portion is provided on the inner surface of the body 1. It is fixed by the support material 21 so that the air A can rise around it, and the second over The lower position of the flow plate 19, from the second overflow plate 19 as configured with a fixed pan 22 to allow the recovery from the recovery pipe 23 receives the ethylene glycol 12 flowing down overflow the inner surface of the body 1.
[0016]
When the high-temperature compressed air A compressed by the compressor 13 is supplied into the body 1 from the inlet 2, it is raised toward the outlet 3 as indicated by the broken line arrow. Cooled when passing through the heat exchanger 4 using the aqueous glycol solution 5 as a refrigerant, then cooled when passing through the second-stage heat exchanger 6 using the cooling water 7 as a refrigerant, and then the aqueous ethylene glycol solution Further cooling is performed by a third-stage heat exchanger 8 using 9 as a refrigerant. Incidentally, if the temperature of the high-temperature compressed air supplied from the inlet 2 is about 180 ° C., it is cooled to about 50 to 100 ° C. by the first stage heat exchanger 4, and the second stage heat exchanger 6 is cooled to about 30 to 50 ° C., and is cooled to about 0 to 10 ° C. in the third stage heat exchanger 8.
[0017]
The air cooled to about 0 to 10 ° C. by the third-stage heat exchanger 8 reaches the position of the heat transfer tube 10 that functions as the fourth-stage heat exchanger, and flows through the heat transfer tube 10. It is cooled to below freezing point by heat exchange. In order to prevent this, when the air is cooled to below the freezing point in the portion of the heat transfer tube 10 as the heat exchanger in the final stage, moisture in the air freezes and adheres to the surface of the heat transfer tube 10. In the previous stage of the heat transfer tube 10 that performs heat exchange at the 0 ° C. level, it is dehumidified and dried.
[0018]
Since the dehumidifier 14 in the cooling device of the present invention has a structure in which the first overflow plate 16, the second overflow plate 19 and the receiving tray 22 have a three-stage structure, ethylene glycol 12 as a dehumidifying agent is used as the first overflow plate. The curtain 12a of ethylene glycol 12 can be made into a cylindrical shape by overflowing and flowing down from the opening 17 in the center of the 16 and further, the ethylene glycol can be made into a cylindrical shape by overflowing from the peripheral portion of the second overflow plate 19 Twelve curtains 12a can be made. Therefore, as shown in FIG. 2, the compressed air A that rises as indicated by the broken-line arrow must pass through the curtain 12 a of ethylene glycol 12 that rises through the central portion of the tray 22 and then overflows from the second overflow plate 19. Therefore, the moisture is surely dehumidified and further dehumidified by passing through the curtain 12a of ethylene glycol 12 flowing down from the central opening 17 of the upper first overflow plate 16. As a result, the moisture in the compressed air A at the 0 ° C. level reaching the heat transfer tube 10 is removed by effective contact with the ethylene glycol 12 and is not frozen in heat exchange in the heat transfer tube 10. It is possible to prevent icing from occurring on the surface.
[0019]
Next, FIGS. 3A and 3B show another embodiment of the present invention. In the same configuration as the dehumidifier 14 shown in FIG. A continuous slit 24 is provided, and the ethylene glycol 12 flows in a curtain shape from each slit 24 so as to be received by the second overflow plate 19. In the figure, the same components as those in FIG.
[0020]
With such a configuration, the curtain 12a of ethylene glycol 12 flowing down from the first overflow plate 16 is partially doubled in the radial direction, so that the compressed air A passes through the ethylene glycol 12 flowing down in double. Thus, dehumidification is performed more effectively.
[0021]
In addition, if the same slit is provided in the outer peripheral part of the 2nd overflow plate 19, the ethylene glycol 12 which flows down from the 2nd overflow plate 19 can be made partially double, and the contact efficiency with air can be improved further, and it is advantageous. In this case, the slit 24 may be provided in only one of the first overflow plate 16 and the second overflow plate 19.
[0022]
FIGS. 4A and 4B show still another embodiment of the present invention. As the dehumidifier 14, the first overflow plate 16 and the second overflow plate 19 shown in FIGS. The plate 25 is provided with a plurality of small holes 26 in the peripheral portion and a receiving portion 27 of the ethylene glycol 12 in the central portion, and a plurality of slits 28 provided in the circumferential direction in the receiving portion 27. The ethylene glycol 12 injected from the injection tube 15 is received by the receiving tray 22 so as to flow down from the slits 28 in the form of curtains, while the compressed air A flows down as indicated by the broken arrow. Through the small holes 26 in the peripheral portion.
[0023]
Also in this embodiment, the compressed air A and the ethylene glycol 12 are sufficiently brought into contact with each other, so that moisture in the compressed air A can be removed and the moisture can be effectively dehumidified.
[0024]
In addition, in the said embodiment, although the case where the heat exchangers 4, 6, and 8 were installed in three steps was illustrated, it may be other than three steps, and the ethylene glycol 12 injected into the dehumidifier 14 is ethylene glycol. The ethylene glycol 12 supplied from the concentrating unit and recovered from the dehumidifier 14 may be temporarily stored in a recovery tank and then returned to the ethylene glycol concentrating unit with a pump for circulation. It goes without saying that various changes can be made within the range not to be performed.
[0025]
【The invention's effect】
As described above, according to the air drying and cooling apparatus of the present invention, the following excellent effects can be obtained.
(1) Heat for cooling by sequentially exchanging high-temperature compressed air supplied from the compressed air inlet at the lower part of a saddle-shaped body having an inlet for compressed air at the lower end and an outlet at the upper end The exchangers are arranged in multiple stages, and a heat transfer tube as a final stage heat exchanger for cooling the compressed air below the freezing point is provided on the outlet side at the upper end of the fuselage, and the compressed air is cooled to a sub-freezing level. In front of the heat transfer tube, a dehumidifier is provided in which ethylene glycol for dehumidifying the air flows down in a curtain and the rising compressed air is made to contact through the ethylene glycol flowing down in the form of a curtain. Since the compressed air heat-exchanged in the multi-stage heat exchanger at the inner and lower parts is dehumidified and dried and then guided to the heat transfer tube as the final-stage heat exchanger, the multi-stage heat exchanger The Then, the air cooled to about 0 ° C. can be effectively brought into contact with the ethylene glycol flowing down in the form of a curtain and can be reliably dehumidified, so that moisture in the air freezes in the final stage. it gone, Ru can be prevented to cause icing on the surface of the heat transfer tube. In addition, since it is a vertical type, it is possible not only to install a dehumidifier that can flow ethylene glycol for dehumidification in the form of a curtain as described above, but also to reduce the installation space compared to the conventional horizontal type. Ru can be significant savings Te.
(2) Further, a dehumidifier configured to allow ethylene glycol to flow down in a curtain shape and to let compressed air rising as it flows through the ethylene glycol flow down in a curtain shape to overflow the ethylene glycol from the opening in the center portion and to curtain A first overflow plate that flows down in a cylindrical shape, a second overflow plate that receives ethylene glycol that has flowed down from the first overflow plate, overflows from the periphery, and flows down in a curtain shape, and ethylene that flows down from the second overflow plate with the structure comprising a receiving tray for receiving a glycol, compressed air Ru can increase the dehumidification effect can contact the ethylene glycol and 2-step.
(3) In addition to the overflowing ethylene glycol, the slits extending in the circumferential direction are provided in either or both of the first overflow plate and the second overflow plate in the dehumidifier. The ethylene glycol can flow down in the form of a curtain, the ethylene glycol curtain can be doubled at the same height, and the contact efficiency with the air can be further improved, and the dehumidifying effect can be enhanced. The
(4) A dehumidifier configured to allow ethylene glycol to flow down in a curtain shape and to bring the compressed air that rises through the ethylene glycol flowing down into a curtain shape into contact with the periphery of the dehumidifier and to receive ethylene glycol in the central portion. By using a plate comprising a plate provided with a plurality of slits extending in the circumferential direction and a receiving tray for receiving ethylene glycol flowing down from the receiving portion, contact between compressed air and ethylene glycol is prevented. It is sufficiently performed to remove moisture in the compressed air, and can be effectively dehumidified.
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of an embodiment of an air drying cooling apparatus of the present invention.
FIG. 2 is an enlarged cross-sectional view of the dehumidifier of FIG.
FIGS. 3A and 3B show another embodiment of the dehumidifier, in which FIG. 3A is a cut side view, and FIG.
4A and 4B show still another embodiment of the dehumidifier, where FIG. 4A is a cut side view, and FIG. 4B is a cross-sectional view taken along the line CC of FIG.
FIG. 5 is a side view schematically showing a conventional air drying and cooling apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body 2 Inlet 3 Outlet 4 Heat exchanger 6 Heat exchanger 8 Heat exchanger 10 Heat transfer pipe 12 Ethylene glycol 13 Compressor 14 Dehumidifier 15 Injection pipe 16 1st overflow plate
17 Opening 19 Second overflow plate 22 Receptacle 23 Recovery tube 24 Slit 25 Plate 26 Small hole
27 Receiving part 28 Slit

Claims (4)

The lower part of the fuselage of the vertical having an outlet to and upper end has an inlet for compressed at a lower end air, a heat exchanger for cooling the compressed air of high temperature is supplied from the compressed air inlet to replace sequential heat A heat transfer tube that is arranged in multiple stages and further has a heat transfer tube as a final stage heat exchanger that cools the compressed air below the freezing point on the outlet side of the upper end in the fuselage , and that cools the compressed air to a sub-freezing level. of before, it becomes the ethylene glycol for dehumidifying the air to provide a dehumidifier that is the compressed air rises to be in contact throughout the glycol flowing down like a curtain causes to flow in a curtain shape, fuselage lower An air drying / cooling apparatus, wherein the compressed air heat-exchanged by the multi-stage heat exchanger is dehumidified and dried, and then guided to the heat transfer tube as the final-stage heat exchanger . A dehumidifier configured to allow ethylene glycol to flow down in a curtain shape and to let the compressed air rising as it flows through the ethylene glycol flow down in the curtain shape to overflow the ethylene glycol from the opening in the center and flow down into the curtain shape. A first overflow plate, a second overflow plate that receives ethylene glycol flowing down from the first overflow plate, overflows from the periphery, and flows in a curtain shape, and a tray that receives ethylene glycol flowing down from the second overflow plate The air drying / cooling device according to claim 1, wherein The air drying / cooling device according to claim 2, wherein a slit extending in a circumferential direction is provided in one or both of the first overflow plate and the second overflow plate in the dehumidifier . A dehumidifier that is made to contact ethylene glycol flowing down into the curtain shape and let the rising compressed air flow through the ethylene glycol flowing down into the curtain shape is made into a perforated plate at the periphery and a circle at the ethylene glycol receiving portion at the center. 2. An air drying and cooling apparatus according to claim 1, comprising a plate using a plate provided with a plurality of slits extending in the circumferential direction and a receiving tray for receiving ethylene glycol flowing down from the receiving portion .

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