JPH10323530A - Dehumidifying device of compressed air - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pipe portion made of Cu, etc. arranged in the vicinity of the inlet of compressed air cooled with a primary heat exchanger from generating erosion. SOLUTION: In this device, the circumference of a pipe 22 portion arranged in the vicinity of the inlet of compressed air cooled with a primary heat exchanger 20 is covered with a tubular member 52 formed of stainless steel, etc. of an anticorrosion member 50. A high temp. of compressed air containing moisture fed at a >=10 m/s high speed to the primary heat exchanger 20 through an introduction port 12 is prevented from being brought into contact with the pipe 22 portion by the tubular member 52 to prevent the pipe 22 portion from generating erosion. At the same time, even though the high temp. of compressed air containing moisture fed at the >=10 m/s high speed to the primary heat exchanger 20 through the introduction port 12 is brought into contact with the tubular member 52 covering the circumference of the pipe 22 portion, the tubular member 52 is made so as not to generate erosion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for cooling high-temperature compressed air containing moisture discharged from a compressor or the like,
The present invention relates to a compressed air dehumidifier for condensing water contained in the compressed air and removing it from the compressed air.

[0002]

2. Description of the Related Art As the above dehumidifier, there is a dehumidifier of the type in which compressed air is cooled using an evaporator of a refrigeration cycle as shown in FIG.

In this dehumidifier, a primary heat exchanger 20 is accommodated in an upper part of a cylindrical tank 10 placed horizontally. The primary heat exchanger 20 includes a pipe 22 arranged in the axial direction of the tank 10 and a plurality of baffle plates 24 arranged side by side in a staggered manner at a predetermined pitch around a middle part of the pipe 22. And is formed from Pipe 22
Is made of copper, brass, aluminum, or the like, which is erosive, that is, highly thermally conductive, which easily causes erosion.

[0004] A secondary heat exchanger 3 is provided in a lower portion of the tank 10.
0 is stored. Secondary heat exchanger 30 is formed from evaporator 42 of refrigeration cycle 40. The refrigeration cycle 40 includes, for example, an evaporator 42 housed in a lower part of the tank 10 and a compression pump 4 arranged outside the tank 10.
4, a condenser 45, a capillary tube 46, and a circulation path 48 for circulating a refrigerant between them. The evaporator 42 is formed by a meandering pipe 42a made of copper, brass, aluminum, or the like, which is erosive, that is, easily eroded. Around the middle portion of the pipe 42a, a plurality of fins 47 for efficiently cooling compressed air passing around the pipe 42a by a low-temperature fluid of a refrigerant passing inside the pipe 42a.
Are arranged side by side in a staggered manner.

[0005] In the upper side wall of the tank 10, an inlet 1 for introducing hot compressed air containing moisture into the tank 10 is provided.
2 and an outlet 14 for discharging compressed air cooled and dehumidified in the tank 10 to the outside of the tank 10 are provided side by side. A partition wall 16 for forming a passage for compressed air in the tank 10 is provided at various places in the tank 10.

[0006] As indicated by arrows in FIG. 6, high-temperature compressed air containing moisture introduced into the tank 10 through the inlet 12 is supplied to a plurality of baffle plates around the pipe 22 of the primary heat exchanger 20. It swells between 24 to allow passage. Next, the compressed air is passed around the evaporator 42 of the secondary heat exchanger 30 so as to be cooled by the low-temperature fluid of the refrigerant passing inside the pipe 42a of the evaporator 42. Then, the water contained in the compressed air is condensed and can be removed from the compressed air. Moisture removed from the compressed air and accumulated in the bottom of the tank 10 can be discharged to the outside of the tank 10 through a drain outlet 18 provided in a lower side wall of the tank 10.

[0007] The compressed air from which water has been removed by cooling is
The primary heat exchanger 20 passes through the inside of the pipe 22, and can be discharged to the outside of the tank 10 through the discharge port 14. At this time, the high-temperature compressed air that is undulated and passed between a plurality of baffles 24 around the pipe 22 of the primary heat exchanger 20 by the low-temperature fluid of the cooled compressed air that passes inside the pipe 22 Can be cooled primarily.

[0008] In other words, the tank 1 through the inlet 12
High-pressure compressed air containing moisture introduced into the
Primary heat exchanger 20 and secondary heat exchanger 30 housed in
Thus, primary cooling and secondary cooling can be performed. Then, the water contained in the compressed air can be removed from the compressed air. The compressed air from which water has been removed by cooling is discharged to the outside of the tank 10 through the discharge port 14. The water removed from the compressed air can be discharged to the outside of the tank 10 through the drain outlet 18.

[0009]

In the dehumidifier, the erodible pipe 22 made of copper, brass, aluminum or the like is arranged near the inlet of the compressed air to be cooled by the primary heat exchanger 20. And a portion of the pipe 22 around which compressed air containing moisture passes at a high speed,
Erosion occurred, and a hole or a breach was formed in the pipe 22 portion, and accidents frequently occurred in which the function of the primary heat exchanger 20 was impaired. Therefore, the primary heat exchanger 20
It had to be changed frequently, taking a lot of trouble and time.

Similarly, in a dehumidifier having a structure similar to that of the above-described dehumidifier, an erodible material made of copper, brass, aluminum or the like of the evaporator 42 disposed near the inlet of the compressed air to be cooled by the secondary heat exchanger 30 is used. When the compressed air containing moisture passed around the pipe 42a having a high speed at a high speed, the pipe 42a was eroded, and a hole or a crack was formed in the pipe 42a. And the accident which the function of the secondary heat exchanger 30 was impaired frequently occurred. Therefore, the evaporator 40 of the secondary heat exchanger 30 has to be replaced frequently with a great deal of trouble and time.

The reason why the pipe 22 of the primary heat exchanger 20 or the pipe 42a of the secondary heat exchanger 30 disposed near the inlet of the compressed air to be cooled erodes will be described in detail. 42a is the primary heat exchanger 20 or the secondary heat exchanger 30 (hereinafter collectively referred to as the heat exchangers 20 or 30).
High heat conductivity copper,
It is made of a material such as brass or aluminum which is susceptible to erosion (corrosion), that is, a member having erosion. On the other hand, the flow velocity of the compressed air near the inlet of the compressed air to be cooled by the heat exchanger 20 or 30 is as high as about 14 m / s because the inlet of the compressed air is formed with a small diameter. copper,
It is known that, in a erodible pipe made of brass, aluminum, or the like, if the flow rate of air containing moisture passing around the pipe is 10 m / s or more, the pipe may erode. . As a result, the heat exchanger 20 or 3
A erodible pipe 22 made of copper, brass, aluminum or the like arranged near the inlet of compressed air to be cooled.
This is because the portion or the pipe 42a is exposed to the environment where erosion occurs.

The pipe 22 or the pipe 42a of the heat exchanger 20 or 30 other than near the compressed air inlet to be cooled by the heat exchanger 20 or 30 does not erode. The reason is that the compressed air after being sent to the heat exchanger 20 or 30 and the compressed air passing around the pipe 22 or 42a of the heat exchanger 20 or 30 has its flow path cross-sectional area expanded. , The flow rate of which is pipe 22 or 42
This is because a falls to less than 10 m / s without causing erosion.

The erodible pipe 22 is arranged near the inlet of the compressed air to be cooled by the heat exchanger 20 or 30.
As a method for preventing erosion of the portion or the pipe 42a, a method of reducing the flow rate of the compressed air to be cooled to be sent to the heat exchanger 20 or 30 by expanding the inner diameter of the inlet of the compressed air to be cooled by the heat exchanger 20 or 30 Can be considered. However,
For a pipe (not shown) through which compressed air to be cooled passes, a pipe having an inner diameter of 1.5 inches is generally used. Therefore, when the inlet of the compressed air to be cooled by the heat exchanger 20 or 30 is expanded to 3 inches or the like as described above,
A joint having a different diameter is required to increase the inner diameter of the distal end portion of the conduit through which the compressed air to be cooled passes. As a result, a space for installing the different diameter joint between the pipe and the inlet is required, and the dehumidifier cannot be made compact. In addition, it takes a lot of trouble and time to mount the different diameter joint.

A method of extending a net (not shown) at the inlet of the compressed air to be cooled by the heat exchanger 20 or 30 to reduce the flow rate of the compressed air to be cooled sent to the heat exchanger 20 or 30 is also available. ,Conceivable. However, in such a case, the pressure loss of the compressed air when the net passes through the inlet of the heat exchanger 20 or 30 in which the net is stretched is increased, and the compression given by the compressor or the like is correspondingly increased. The energy of the air is wasted. Then, the pressure drop of the compressed air discharged from the heat exchanger 20 or 30 increases. Therefore, in consideration of the pressure drop of the compressed air, the compressor or the like must be operated at a high speed so as to obtain high-pressure compressed air from the compressor or the like.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and the erosive pipe portion disposed near the inlet of the compressed air to be cooled in the heat exchanger has a high-temperature compressed air containing moisture. It is an object of the present invention to provide a compressed air dehumidifier (hereinafter, referred to as a dehumidifier) that can prevent erosion due to humidification.

[0016]

In order to achieve the above object, a dehumidifier of the present invention cools a high-temperature compressed air with a heat exchanger to condense the water contained in the compressed air, thereby compressing the compressed air. What is claimed is: 1. A dehumidifier, wherein the heat exchanger has a structure in which compressed air for cooling around a pipe through which a low-temperature fluid passes passes through the heat exchanger. The erosion-causing pipe disposed near the inlet of compressed air is covered with a corrosion-resistant member.

In this dehumidifier, the corrosion-resistant member surrounds the erodible pipe portion disposed near the inlet of the compressed air to be cooled by the heat exchanger. for that reason,
Even if the compressed air to be cooled is sent at a high speed of 10 m / s or more to a pipe portion arranged near the inlet of the compressed air to be cooled by the heat exchanger, the high-temperature compressed air containing the moisture is supplied to the heat exchanger. The erodible pipe portion disposed near the inlet of the compressed air to be cooled can be prevented from being touched by the corrosion-resistant member covering the periphery of the pipe portion. The compressed air fed at a high speed of 10 m / s or more can prevent erosion of the pipe portion arranged near the inlet of the compressed air to be cooled by the heat exchanger.

Further, since the member covering the periphery of the pipe portion arranged near the inlet of the compressed air to be cooled of the heat exchanger is a corrosion-resistant member, the corrosion-resistant member is connected to the heat exchanger by 10 m / cm.
The corrosion-resistant member can be prevented from being eroded even when touched by high-temperature compressed air containing moisture fed at a high speed of s or more.

In the dehumidifying device of the present invention, the corrosion-resistant member is a corrosion-resistant pipe-shaped member placed around the erosion-causing pipe disposed near the inlet of the compressed air to be cooled by the heat exchanger. It is preferred that there be.

In this dehumidifying device, the pipe-shaped member allows the heat exchanger to be connected to the erodible pipe portion located near the inlet of the compressed air to be cooled by 10 m.
/ S can be prevented from being touched by compressed air containing moisture fed at a high speed of not less than / s.

In addition, since the pipe-shaped member has corrosion resistance,
Even if the pipe-shaped member comes into contact with compressed air containing moisture sent at a high speed of 10 m / s or more to the heat exchanger, the pipe-shaped member can be prevented from eroding.

Alternatively, in the dehumidifying apparatus of the present invention, the corrosion-resistant member is provided with a corrosion-resistant inverted U coated around a erosion-causing pipe disposed near the inlet of compressed air to be cooled by the heat exchanger. Preferably, it is a character-shaped channel-shaped member.

In this dehumidifying device, the erodible device is disposed near the compressed air inlet of the heat exchanger inside the inverted U-shaped channel member through the opening of the inverted U-shaped channel member. The pipe portion can be inserted without being hindered by a baffle or a fin or the like provided upright around the middle of the pipe. And the circumference | surroundings of the pipe part arrange | positioned near the inlet of the compressed air to be cooled of the heat exchanger can be easily covered by the inverted U-shaped channel-shaped member. Then, by the inverted U-shaped channel member, the moisture fed into the heat exchanger at a high speed of 10 m / s or more around the erosive pipe portion arranged near the inlet of the compressed air to be cooled by the heat exchanger. Can be prevented from touching the compressed air.

Further, since the inverted U-shaped channel member has corrosion resistance, the inverted U-shaped channel member is connected to the heat exchanger.
Even if compressed air containing water fed at a high speed of 0 m / s or more touches, the inverted U-shaped channel-shaped member can be prevented from eroding.

Alternatively, in the dehumidifier of the present invention, the corrosion-resistant member is a corrosion-resistant coating layer that is disposed near the inlet of the compressed air to be cooled of the heat exchanger and that surrounds the erosion-causing pipe. It is preferred that there be.

In this dehumidifier, the coating layer causes the heat exchanger to extend 10 m around the erodible pipe located near the inlet of the compressed air to be cooled by the heat exchanger.
/ S can be prevented from being touched by compressed air containing moisture fed at a high speed of not less than / s.

In addition, since the coating layer has corrosion resistance, even if the coating layer comes into contact with compressed air containing water fed at a high speed of 10 m / s or more to the heat exchanger, the coating layer may be eroded. Can be prevented.

[0028]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a preferred embodiment of the dehumidifier of the present invention. FIG. 1 is an enlarged front view of the vicinity of an inlet of compressed air to be cooled by a primary heat exchanger, and FIG.
FIG. 3 is an enlarged side sectional view of the vicinity of an inlet of compressed air to be cooled by the secondary heat exchanger, and FIG. 3 is an enlarged perspective view of a pipe portion thereof. Hereinafter, this dehumidifier will be described.

In the dehumidifier shown in the figure, a number of pipes 22 of the primary heat exchanger 20 are arranged in a bundle in the axial direction of the tank 10. Both ends of the pipes 10 arranged in a large number of bundles are supported by a tube bundle plate 16 a also serving as a partition plate 16. Pipes 1 arranged in a bundle
A plurality of baffle plates 24 are arranged side by side in an upright state around the middle part of the zero. The pipe 22 is formed of a erodible member such as copper, brass, and aluminum having high thermal conductivity.

A plurality of erosion-causing pipes 22 arranged side by side near the inlet of the compressed air to be cooled of the primary heat exchanger 20 exposed inside the inlet 12, the baffle plate 24 and the tube bundle plate The periphery of the portion of the pipe 22 sandwiched between the portions 16a and 16a is covered with a corrosion-resistant member 50. Specifically, FIG.
As shown in (1), a pipe member 52 having corrosion resistance is covered around a portion of the pipe 22 sandwiched between the baffle plate 24 and the tube bundle plate 16a. The pipe-shaped member 52 is made of stainless steel, stainless steel or other stainless metal, or a plastic material.

The rest of the configuration is the same as that of the dehumidifier shown in FIG. 6 described above. In this dehumidifier, the compressed air to be cooled to the primary heat exchanger 20 through the inlet 12 is one.
Even when the compressed air is fed at a high speed of 0 m / s or more, the high-temperature compressed air containing the water touches the erodible pipe 22 disposed near the inlet of the compressed air to be cooled in the primary heat exchanger 20. Can be prevented by the pipe-shaped member 52 covering the periphery of the pipe 22 portion. The compressed air can prevent the pipe 22 disposed near the inlet of the compressed air to be cooled by the primary heat exchanger 20 from being eroded.

Further, since the pipe-shaped member 52 covering the periphery of the pipe 22 disposed near the inlet of the compressed air to be cooled by the primary heat exchanger 20 has corrosion resistance, the pipe-shaped member 52 has Even if the compressed air to be cooled, which is sent at a high speed of 10 m / s or more, to the next heat exchanger 20 touches, the compressed air containing the water can prevent the pipe-shaped member 52 from eroding.

In the above dehumidifier, the primary heat exchanger 2
In the dehumidifier having a structure similar to the above-described dehumidifier, only the periphery of the erodible pipe 22 disposed near the inlet of the compressed air to be cooled is covered with the corrosion-resistant member 50. The flow rate of the compressed air containing moisture passing near the inlet of the compressed air to be cooled by the exchanger 30 becomes 10 m / s or more, and the evaporation disposed near the inlet of the compressed air to be cooled by the secondary heat exchanger 30 Pipe 42a formed of a erodible member such as copper, brass, aluminum or the like of the vessel 42
If there is a risk of erosion of the part, the pipe 42a
The periphery of the portion is preferably covered with a pipe-shaped member 52 of the corrosion-resistant member 50 as shown in FIG. And the pipe 42
It is preferable that the durability of the secondary heat exchanger 30 be increased by preventing the pipe 42a from being eroded by the compressed air containing moisture passing around the portion a.

The erosion-causing pipe 22 disposed near the inlet of the compressed air to be cooled of the primary heat exchanger 20 or the secondary heat exchanger 30 (hereinafter collectively referred to as the heat exchangers 20 or 30). Alternatively, the corrosion-resistant member 50 covering the periphery of the pipe 42a may be a heat exchanger 20 or 3 as shown in FIG.
The corrosion-resistant inverted U-shaped channel-shaped member 54 may be disposed around the erosion-causing pipe 22 or the pipe 42a near the inlet of the compressed air to be cooled.

When the corrosion-resistant member 50 is a corrosion-resistant inverted U-shaped channel member 54, the inside of the inverted U-shaped channel member 54 is passed through the opening 54a of the inverted U-shaped channel member. A baffle plate 24, a tube bundle plate 16a or a fin 47 provided so that a pipe 22 or pipe 42a portion disposed near the inlet of the compressed air to be cooled by the heat exchanger 20 or 30 is raised around the pipe 22 or 42a. It can be inserted without being hindered by the like. Then, the heat exchanger 20 or 3 is formed by the inverted U-shaped channel member 54.
Pipe 2 placed near the inlet of compressed air to be cooled
The periphery of the two portions or the portion of the pipe 42a can be easily covered.

Even if compressed air for cooling at a high speed of 10 m / s or more is fed into the heat exchanger 20 or 30 by the inverted U-shaped channel member 54, the high-temperature compressed air containing the water is heated. By touching the erodible pipe 22 or pipe 42a disposed near the inlet of the compressed air to be cooled in the exchanger 20 or 30, the erosion of the pipe 22 or pipe 42a can be prevented.

Also, since the inverted U-shaped channel member 54 has corrosion resistance, the inverted U-shaped channel member 54
Even if the compressed air to be cooled, which is sent to the heat exchanger 20 or 30 at a high speed of 10 m / s or more, comes into contact with the compressed air containing water, the inverted U-shaped channel member 54 may be eroded. Can be prevented.

As shown in FIG. 5, the corrosion-resistant member 50 is disposed near the erosion-causing pipe 22 or pipe 42a disposed near the inlet of the compressed air to be cooled by the heat exchanger 20 or 30. May be a coating layer 56 such as a corrosion-resistant nickel plating layer, a resin coating layer, or the like that covers the surface. When the pipe 22 or 42a is made of aluminum, the coating layer 56 may be a corrosion-resistant anodized aluminum layer.

When the corrosion-resistant member 50 is a coating layer 56 having corrosion resistance, compressed air for cooling into the heat exchanger 20 or 30 is sent by the coating layer 56 at a high speed of 10 m / s or more. In addition, the high-temperature compressed air containing the moisture is eroded by the pipe 22 or the pipe 4 disposed near the inlet of the compressed air to be cooled by the heat exchanger 20 or 30.
2a, touch the pipe 22 or pipe 42a
The coating layer 56 can prevent erosion of the portion.

Also, since the coating layer 56 has corrosion resistance, even if the compressed air to be cooled fed into the heat exchanger 20 or 30 at a high speed of 10 m / s or more touches the coating layer 56,
The compressed air containing the water can prevent the coating layer 56 from eroding.

Further, according to the present invention, the primary heat exchanger 20 and the secondary heat exchanger 30 are housed in separate tanks (not shown) or separated by partition walls or the like in the tanks. Or a dehumidifier having a structure connected by a circulation path for circulating compressed air for cooling between the separate tanks or between the separate rooms. It is possible. If the present invention is applied to such a dehumidifier, the erodible pipe 22 disposed near the inlet of the compressed air to be cooled by the primary heat exchanger 20, or the secondary heat exchanger The erodible pipe 42a located near the inlet of the compressed air to be cooled at 30
Corrosion can be prevented from being caused by compressed air containing moisture passing at high speed around the pipe 22 or the pipe 42a.

[0042]

As described above, according to the dehumidifier of the present invention, the compressed air to be cooled, which is fed into the heat exchanger at a high speed of 10 m / s or more, is close to the inlet of the compressed air to be cooled by the heat exchanger. Can be prevented from touching the erodible pipe portion disposed in the pipe, thereby preventing the pipe portion from being eroded by hot compressed air containing moisture. And
The durability of the dehumidifier can be greatly improved.

In addition, since only the periphery of the pipe disposed near the inlet of the compressed air to be cooled in the heat exchanger is covered with a corrosion-resistant member, the manufacturing process of the dehumidifier and the number of parts thereof are greatly increased. Therefore, the durability of the dehumidifying device can be greatly improved.

Further, it is possible to prevent the loss of the energy of the compressed air passing through the heat exchanger, thereby preventing the pressure loss of the compressed air discharged from the heat exchanger from increasing.

Further, it is not necessary to form the entire pipe forming the heat exchanger with a corrosion-resistant and expensive stainless steel or the like stainless steel, which greatly increases the manufacturing cost of the dehumidifier. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of the vicinity of an inlet of compressed air to be cooled in a primary heat exchanger of a dehumidifier of the present invention.

FIG. 2 is an enlarged side sectional view of the vicinity of an inlet of compressed air to be cooled in a primary heat exchanger of the dehumidifier of the present invention.

FIG. 3 is an enlarged perspective view of a pipe portion of the dehumidifier of the present invention.

FIG. 4 is an enlarged side view of a pipe portion of the dehumidifying device of the present invention.

FIG. 5 is an enlarged perspective view of a pipe portion of the dehumidifier of the present invention.

FIG. 6 is a schematic structural explanatory view of a dehumidifier.

[Explanation of symbols]

 Reference Signs List 10 Tank 12 Compressed air inlet 14 Compressed air outlet 16 Partition plate 16a Tube bundle plate 18 Drain outlet 20 Primary heat exchanger 22 Pipe 24 Baffle plate 30 Secondary heat exchanger 40 Refrigeration cycle 42 Evaporator 42a Pipe 44 Compression pump 45 Condenser 46 Capillary tube 48 Circulation path 50 Corrosion-resistant member 52 Pipe-shaped member 54 Inverted U-shaped channel-shaped member 56 Coating layer

Claims (4)

[Claims] 1. Cooling hot compressed air with a heat exchanger,
A dehumidifier that condenses moisture contained in the compressed air and removes the compressed air from the compressed air, wherein the heat exchanger has a structure in which compressed air that cools around a pipe through which a low-temperature fluid passes passes inside. In a dehumidifier consisting of
A compressed air dehumidifying device, wherein a erosion-causing pipe portion arranged near an inlet of compressed air to be cooled of the heat exchanger is covered with a corrosion-resistant member. 2. The corrosion-resistant pipe member is a corrosion-resistant pipe-shaped member which is placed around a pipe portion which causes erosion and is disposed near an inlet of compressed air to be cooled by a heat exchanger.
A compressed air dehumidifier according to any of the preceding claims. 3. The corrosion-resistant member is a corrosion-resistant inverted U-shaped channel member disposed around an erosion-causing pipe portion disposed near an inlet of compressed air to be cooled by a heat exchanger. The compressed air dehumidifier according to claim 1. 4. The compressed air according to claim 1, wherein the corrosion-resistant member is a corrosion-resistant coating layer surrounding the erosion-causing pipe portion disposed near the inlet of the compressed air to be cooled in the heat exchanger. Dehumidifier.