JP2008180100A - Air compression device - Google Patents

Air compression device Download PDF

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Publication number
JP2008180100A
JP2008180100A JP2007012424A JP2007012424A JP2008180100A JP 2008180100 A JP2008180100 A JP 2008180100A JP 2007012424 A JP2007012424 A JP 2007012424A JP 2007012424 A JP2007012424 A JP 2007012424A JP 2008180100 A JP2008180100 A JP 2008180100A
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Japan
Prior art keywords
air
water
heat exchanger
gas
drain water
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Pending
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JP2007012424A
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Japanese (ja)
Inventor
Akira Fujisawa
Kazuto Okada
Akinori Tamura
Junichiro Totsuka
和人 岡田
順一朗 戸塚
彰規 田村
亮 藤澤
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Kobe Steel Ltd
株式会社神戸製鋼所
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Application filed by Kobe Steel Ltd, 株式会社神戸製鋼所 filed Critical Kobe Steel Ltd
Priority to JP2007012424A priority Critical patent/JP2008180100A/en
Publication of JP2008180100A publication Critical patent/JP2008180100A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact air compression device capable of improving a cooling effect by suppressing power of an air-cooled heat exchanger while surely securing a sufficient drain water volume even when water is sprinkled. <P>SOLUTION: Compressed air discharged from a screw compressor 10 and including moisture is supplied to a first gas-liquid separation tank 20, the moisture of the compressed air is deposited by the first gas-liquid separation tank 20 and stored as first drain water, and the first drain water is returned to the screw compressor 10 through a water cooler 50. The compressed air separated by the first gas-liquid separation tank 20 is supplied to a second gas-liquid separation tank 90 through a dryer 70 and a fan 80, the moisture of the compressed air is further deposited by the second gas-liquid separation tank 90 and stored as second drain water, and returned to the downstream side of the first gas-liquid separation tank 20. Sprinkler nozzles 60 sprinkle at least either of the first drain water and the second drain water returned to the down stream side of the first gas-liquid separation tank 20 on an outside surface part of the water cooler 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air compression apparatus provided with an air-cooled heat exchanger.

  Conventionally, in an air compressor, an oil / water supply means for supplying oil and water as a lubricant or a cooling medium has been provided. However, there are many cases where oil cannot be used or desired to be used because of manufacturing problems or environmental problems, and there is an increasing need to use only water as a lubricant and cooling medium. For this reason, air compressors using only water as a lubricant and cooling medium have been developed, and further developments have been made to solve the problems of air compressors using only water as a lubricant and cooling medium.

  For example, in Patent Document 1, it is possible to continuously operate for a long time without replenishing water, and to reduce the impurity concentration of circulating water and clean it for a long time without using a deionizer or a water purification device. A water jet type air compressor and its water quality management method are disclosed that can be maintained and can suppress bacterial growth without exchanging circulating water and reduce the amount of bacteria in the circulating water.

  According to the water injection type air compressor and the water quality management method described in Patent Document 1, it is possible to operate continuously for a long time without replenishing water, and to use a pure water device or a water purification device. The effect of reducing the concentration of impurities in the circulating water and keeping it clean for a long time can be obtained.

  Patent Document 2 discloses a compressor provided with an air-cooled heat exchanger.

  According to the compressor provided with the air-cooled heat exchanger described in Patent Document 2, a water spray channel that guides the drain water separated and deposited from the discharge gas to the surface of the air-cooled heat exchanger heat transfer section is provided. Therefore, pipes and grooves for separating drain water separated and discharged from the discharge gas to the outside are not required, and the drain water is effectively used for cooling the heat exchanger. Effects such as enabling miniaturization can be achieved.

JP 2000-45948 A Japanese Utility Model Publication No. 4-49678

  However, in the water-injection type air compressor and the water quality management method described in Patent Document 1, the oil supplied to the compressor is changed to oil-lubricated lubrication by changing the oil to water as the lubricant and the cooling medium. It must be set lower than the oil supply temperature. For this reason, the temperature difference between the water to be cooled and the ambient air that is the cooling heat source is reduced, and there remains a problem that the burden on the cooling system is increased as compared with the lubricating oil.

  Moreover, in the compressor provided with the air-cooling type heat exchanger of patent document 2, although the evaporation latent heat of the water sprinkled is utilized, since drain water is sprayed from a sprinkling flow path for heat exchanger cooling, The problem remains that the amount of drain water is insufficient.

  An object of the present invention is to provide an air compression device that can ensure a sufficient amount of drain water even when water is sprayed and is compact and can improve the cooling effect by suppressing the power of an air-cooled heat exchanger. It is.

Means and effects for solving the problems

(1)
An air compressor according to a first aspect of the present invention is an air compressor provided with an air-cooled heat exchanger, wherein compressed air containing moisture discharged from a screw compressor is supplied to the first gas-liquid separation tank, The first circulation path in which the moisture of the compressed air is separated by the gas-liquid separation tank and stored as the first drain water, and the first drain water is returned to the screw compressor via the air-cooled heat exchanger, and the first air The compressed air separated by the liquid separation tank is supplied to the second gas-liquid separation tank through the dryer, the moisture of the compressed air is condensed by the second gas-liquid separation tank and stored as the second drain water, A second circulation path that is refluxed downstream of the first gas-liquid separation tank; and a water spray nozzle that sprays at least one of the first drain water and the second drain water onto the outer surface portion of the air-cooled heat exchanger. Also It is.

  In the air compressor according to the present invention, the first circulation path is formed by the screw compressor, the first gas-liquid separation tank, and the air-cooled heat exchanger, and the second circulation path is formed by the dryer and the second gas-liquid separation tank. Is formed. Then, compressed air containing moisture discharged from the screw compressor is supplied to the first gas-liquid separation tank, and the moisture of the compressed air is separated by the first gas-liquid separation tank and stored as the first drain water. One drain water is returned to the screw compressor through an air-cooled heat exchanger. In addition, the compressed air separated by the first gas-liquid separation tank is supplied to the second gas-liquid separation tank via the dryer, and the second gas-liquid separation tank condenses the moisture of the compressed air to the second. It is stored as drain water and returned to the downstream of the first gas-liquid separation tank. Further, the watering nozzle sprays at least one of the first drain water and the second drain water that is refluxed downstream of the first gas-liquid separation tank onto the outer surface portion of the air-cooled heat exchanger.

  In this case, since the first drain water and the second drain water are sprinkled, the temperature of the drain water flowing in the air-cooled heat exchanger can be lowered by the latent heat of vaporization of the sprinkled water. Moreover, since not only 1st drain water but 2nd drain water can be used, the problem that the quantity of drain water is insufficient at the time of watering can also be solved. Furthermore, since the heat exchange of the air-cooled heat exchanger can be assisted by the latent heat of vaporization of water, the power in the air-cooled heat exchanger can be suppressed, and the size of the air compressor can be reduced.

(2)
The first gas-liquid separation tank may include an electrical conductivity detector that detects the electrical conductivity of the liquid.

  In this case, the salt concentration of the first drain water stored in the first gas-liquid separation tank can be detected by the electrical conductivity detector. As a result, water contamination can be recognized and water close to pure water can be sprayed, so that impurities can be prevented from adhering to the heat exchange portion of the air-cooled heat exchanger and used for a long time. It becomes possible. As a result, the cooling effect can be continuously improved.

(3)
The watering nozzle may be provided in a branch pipe connected to the upstream side of the air-cooled heat exchanger in the first circulation path.

  In this case, since the watering nozzle is connected to the upstream side of the air-cooling heat exchanger in the first circulation path, the first drain water can be used effectively. Moreover, even when the flow rate of the first drain water is small, the second drain water can be used, so that it is possible to prevent the drain water from becoming insufficient.

(4)
The watering nozzle may be provided in a branch pipe connected to the downstream side of the air-cooled heat exchanger in the first circulation path.

  In this case, since the water spray nozzle is connected to the downstream side of the air-cooled heat exchanger in the first circulation path, it is used after the first drain water or the second drain water is cooled, so the air-cooled heat exchanger The heat exchange efficiency can be improved, and the power of the air-cooled heat exchanger can be reduced.

(5)
The air-cooled heat exchanger is further provided with a fan capable of supplying air for air cooling, and the water spray nozzles are provided with the first drain water and the second drain water along the direction of gravity with respect to the air-cooled heat exchanger. The fan is provided so that air for cooling can be given to the heat exchanger part of the air-cooled heat exchanger along the direction opposite to the direction of gravity. May be.

  In this case, at least one of the first drain water and the second drain water sprayed along the gravity direction adheres to the heat exchanger portion of the air-cooled heat exchanger, and further, from the direction opposite to the gravity direction, the fan Since ventilation is performed by this, the heat exchange rate of the air-cooled heat exchanger can be increased. As a result, even in an oil-free environment, it is possible to efficiently cool by increasing the air cooling capacity. In addition, since at least one of the first drain water and the second drain water is sprayed along the direction of gravity, at least one of the first drain water and the second drain water can be applied at a predetermined pressure without resisting gravity. Can be efficiently sprayed. In addition, since the fan can be provided below the air-cooled heat exchanger, it is possible to simplify the fixing of the fan by vibration countermeasures or the like compared with the case where it is provided above the air-cooled heat exchanger. Downsizing can be realized.

(6)
The air-cooled heat exchanger is further provided with a fan that can supply air-cooling air, and the watering nozzle is provided with the first drain water and the first drain water in a direction opposite to the gravity direction with respect to the air-cooled heat exchanger. It is provided so that at least one of the two drain waters can be sprayed, and the fan can supply air cooling air to the heat exchanger part of the air-cooled heat exchanger from the same direction as the spraying direction of the watering nozzle. It may be provided so that it can.

  In this case, since at least one of the blown and sprinkled first drain water and second drain water supplied from one side is supplied to the air-cooled heat exchanger, the drain water is efficiently converted into the air-cooled heat exchanger. The heat exchange rate of the air-cooled heat exchanger can be increased. As a result, even in an oil-free environment, it is possible to efficiently cool by increasing the air cooling capacity. In addition, since the fan can be provided below the air-cooled heat exchanger, it is possible to simplify the fixing of the fan by vibration countermeasures or the like compared with the case where it is provided above the air-cooled heat exchanger. Downsizing can be realized.

(7)
The fan may comprise a sirocco fan.

  In this case, since the fan is a sirocco fan, the air compressor itself can be downsized. Moreover, by using a sirocco fan, a large amount of air can be blown, and the heat exchange rate of the air-cooled heat exchanger can be increased.

(8)
Sprinkle from the spray nozzle and the speed of the wind given by the fan so that the vertical downward end velocity is greater than zero when the air resistance and gravity of the water spray sprayed from the spray nozzle balance and make a constant velocity motion. It is preferable that the initial velocity of the water droplets and the diameter of the water droplets are adjusted.

  In this case, the air resistance due to the wind supplied from the fan is increased in the water droplets to be sprayed, compared to the water droplets sprayed from the water spray nozzle in a no wind state. Therefore, since each parameter is adjusted so that the water droplets sprayed from the watering nozzle have a positive terminal velocity in the vertically downward direction, the water droplets can be sprayed over the entire heat exchanger unit. As a result, the temperature of the drain water flowing in the air-cooled heat exchanger can be lowered by the latent heat of vaporization of the sprinkled water.

Embodiments according to the present invention will be described below. In the present embodiment, a case where a water cooler is used as an air-cooled heat exchanger will be described.
(First embodiment)

  FIG. 1 is a schematic diagram illustrating an example of a configuration of an air compression device 100 including a water cooler 50 according to the first embodiment.

  As shown in FIG. 1, the air compressor 100 includes a screw compressor 10, a first gas-liquid separation tank 20, a flow rate adjustment valve 30, a sirocco fan 40, a water cooler 50, a watering nozzle 60, a solenoid valve 65, a dryer 70, a cooling device. A fan 80, a second gas-liquid separation tank 90, and a drain tank 95 are included.

  As shown in FIG. 1, external air is supplied to the screw compressor 10 from the suction pipe P1. In addition, drain water is recirculated and supplied from the piping P6 described later. These drain waters are used as a lubricant and a cooling medium in a shaft in a screw compressor 10 (see FIG. 2) described later.

  FIG. 2 is a schematic diagram illustrating an example of the screw compressor 10. As shown in FIG. 2, the screw compressor 10 includes screws 10a and 10b. When the shafts 11a and 11b rotate, the air supplied from the suction pipe P1 is compressed by the blades provided on the screws 10a and 10b. The In this case, water supplied from the pipe P6 is used as a sealing material and a lubricant. The screw compressor 10 compresses the air supplied from the suction pipe P1, raises it to a predetermined pressure, and supplies it to the first gas-liquid separation tank 20 via the pipe P2 (see FIG. 1).

  A demister 21 and an electric conductivity meter 22 are provided in the first gas-liquid separation tank 20 of FIG. The demister 21 is provided so as to shield the connection port between the pipe P2 in the first gas-liquid separation tank 20 and a pipe P11 described later. In the present embodiment, it is provided along the upper horizontal plane in the first gas-liquid separation tank 20. Further, the electric conductivity meter 22 is provided in the lower part in the first gas-liquid separation tank 20.

  Here, the demister 21 is for promoting separation of moisture in the compressed air. In the demister 21, micro droplets contained in the compressed air collide with the surface of the filaments in the demister 21 (for example, knitted wire), and the micro droplets have wettability and capillary action. As a result, the combined diameter is increased. That is, by the action of the demister 21 provided in the first gas-liquid separation tank 20, the fine droplets in the compressed air are combined and enlarged, and stored in the first gas-liquid separation tank 20 by gravity settling. The

The electrical conductivity meter 22 measures the electrical conductivity at 25 ° C. of a solution located between opposing electrodes having a cross-sectional area of 1 cm 2 and a distance of 1 cm. The unit is mainly Siemens (S) / m or micrometer. It is expressed in Siemens (μS) / cm. In addition, electrical conductivity is also called electrical conductivity and specific electrical conductivity.

  Further, the electric conductivity meter 22 is used as a means for measuring the salt concentration of the first drain water stored in the first gas-liquid separation tank 20. That is, since water (first drain water) contains more electrolyte and becomes easier to conduct electricity, the amount of dissolved electrolyte can be estimated by electric conductivity (also called conductivity).

  Next, as shown in FIG. 1, the drain water stored below the first gas-liquid separation tank 20 is connected to the pipes P3, P4, P5 provided at the lower part of the first gas-liquid separation tank 20 and the flow rate. It is supplied to the water cooler 50 via the regulating valve 30. That is, when the flow rate adjustment valve 30 is opened, the supply of drain water to the water cooler 50 is started, the supply flow rate is adjusted by adjusting the opening degree, and the flow rate adjustment valve 30 is closed to drain water to the water cooler 50. Supply stops. Two sirocco fans 40 are provided below the water cooler 50. The sirocco fan 40 has a function of sending wind from below the water cooler 50 upward. As a result, the drain water that has passed through the water cooler 50 is cooled and discharged.

Further, the drain water cooled by the water cooler 50 is supplied to the screw compressor 10 via the pipe P6. In the middle of the pipe P6, a pipe P7 extending above the water cooler 50 is provided. The piping P7 is provided with an electromagnetic valve 65 and a plurality of watering nozzles 60. The plurality of watering nozzles 60 starts to spray drain water from the watering nozzle 60 to the water cooler 50 when the electromagnetic valve 65 is opened, and from the watering nozzle 60 to the water cooler 50 when the electromagnetic valve 65 is closed. Stop spraying drain water. The electromagnetic valve 65 is controlled to be either open or shielded by a signal from the electric conductivity meter 22. In the present embodiment, when the measured value of the electrical conductivity in the electrical conductivity meter 22 exceeds 200 mg CaCO 3 / L in total hardness, the electromagnetic valve 65 is set to shift from opening to shielding. In addition, when the measured value of the electrical conductivity in the electrical conductivity meter 22 was less than 200 mg CaCO 3 / L in total hardness, the electromagnetic valve 65 was set to shift from shielding to opening.

In the present embodiment, the control device is not provided, but the present invention is not limited to this, and the control device may receive a signal from the electric conductivity meter 22 to control the opening or shielding of the electromagnetic valve 65. . Furthermore, in the present embodiment, when the measured value of electrical conductivity exceeds 200 mg CaCO 3 / L in total hardness, the opening of the electromagnetic valve 65 is shifted to shielding, but the present invention is not limited to this. Any numerical value may be used as a reference. Further, the reference value at the time of transition from opening to shielding and at the time of transition from shielding to opening may be different.

  On the other hand, the compressed air separated in the upper part of the demister 21 of the first gas-liquid separation tank 20 is given from the upper part of the first gas-liquid separation tank 20 to the dryer 70 via the pipe P11. The dryer 70 is provided with a cooling fan 80. The cooling fan 80 is provided below the dryer 70, and air is supplied from the cooling fan 80 to the dryer 70. The compressed air is cooled by the dryer 70. The cooled compressed air is given to the second gas-liquid separation tank 90 via the pipe P12.

  Similar to the first gas-liquid separation tank 20, the second gas-liquid separation tank 90 is provided with a demister 91. As a result, the small droplets in the compressed air are increased in diameter by the action of the demister 91 provided in the second gas-liquid separation tank 90, and from the second gas-liquid separation tank 90 by gravity sedimentation. It is stored in the drain tank 95. The second drain water stored in the drain tank 95 is started to be supplied to the water cooler 50 via the pipe P14, the pipe P4, and the pipe P5 when the flow rate adjustment valve 30 is opened. The supply to the water cooler 50 is stopped by closing. In addition, the compressed air after the water | moisture content was isolate | separated by the demister 91 in the 2nd gas-liquid separation tank 90 is utilized outside via the piping P15.

  Subsequently, FIG. 3 is a diagram illustrating an example of the internal structure of the water cooler 50.

  As shown in FIG. 3, the internal structure of the water cooler 50 connected to the pipe P5 is formed by bending one or a plurality of pipes P51. Moreover, as shown in FIG. 3, the several radiation fin 52 is provided in parallel along the circular cross section of the piping P51. That is, the piping P51 is provided so as to repeatedly penetrate the plurality of heat radiation fins 52 provided in parallel. Further, the height of the water cooler 50 in the vertical direction is H (m).

  Above the water cooler 50, two watering nozzles 60 are provided facing downward. As the watering nozzle 60, it is preferable to use, for example, a medium injection amount type of an empty conical nozzle. Two sirocco fans 40 are provided below the water cooler 50. The sirocco fan 40 supplies the air volume BL to the water cooler 50 from below. The water sprayed from the water spray nozzle 60 is adjusted to the diameter and water pressure (initial velocity) of the water droplets that can be sprayed over the entire area of the height H of the water cooler 50 against the air volume BL supplied from the sirocco fan 40. Is done. That is, the sprayed water is adjusted so as to have a positive terminal speed (terminal speed greater than zero) vertically downward.

  Next, FIG. 4 is a diagram showing another example of the internal structure of the water cooler 50 of FIG.

  Components and the like constituting the water cooler 50 shown in FIG. 4 are the same as the components of the water cooler 50 shown in FIG. However, unlike FIG. 3, the watering nozzle 60 a is provided between the water cooler 50 and the two sirocco fans 40. As shown in FIG. 4, below the water cooler 50, two watering nozzles 60a are provided facing upward. As the watering nozzle 60a, it is preferable to use, for example, a fine mist generating small flow rate type of an empty conical nozzle.

  Two sirocco fans 40 are provided below the water cooler 50 and the watering nozzle 60a. The water sprayed from the water spray nozzle 60a is adjusted to the water volume and water pressure that can be sprayed over the entire area of the height H along the air volume BL from the sirocco fan 40. That is, in the water cooler 50 of FIG. 4, unlike the water cooler 50 of FIG. 3, even when the pressure of the drain water is low, the drain water can be spread over a wide range along the air volume BL.

  FIG. 5 is an explanatory diagram showing an example of the mutual positional relationship between the sirocco fan 40 and the water cooler 50.

  As shown in FIG. 5, with respect to the length L and the width B of the water cooler 50 in the present embodiment, the wind outlet from the sirocco fan 40 has a length of about 0.3 L and a width of about 0.2 mm. 5B. Further, the outlets from the sirocco fan 40 are arranged substantially equally on the left and right.

  Moreover, FIG. 6 is explanatory drawing which shows the spray position of the drain water sprayed from the water spray nozzle 60 further in the mutual positional relationship of FIG.

  As shown in FIG. 6, the drain water sprayed from the water spray nozzle 60 is sprayed so as to cover almost the entire horizontal section of the water cooler 50. That is, the spray area of the watering nozzle 60 is set to at least the diameter B (the width of the water cooler 50) or more, and the number of watering nozzles 60 is increased or decreased by the length L and the value of the spraying area of the watering nozzle. In the present embodiment, since the value of the length L is about twice the value of the width B, two watering nozzles 60 are provided. In the present embodiment, the number of watering nozzles 60 is two. However, the present invention is not limited to this, and three or four or any other arbitrary number may be provided. Moreover, it is good also as making it spray to the area | region where the water sprayed from the watering nozzle 60 becomes comparatively slow in airflow velocity.

  As described above, the water sprayed from the watering nozzle 60 in FIG. 3 is set to have a diameter such that the terminal speed is larger than the air volume BL from the opposing sirocco fan 40. The water sprayed from is distributed in the entire area of the water cooler 50 having a height H, a length L, and a width B. As a result, in the water cooler 50, the latent heat is taken away from the water cooler due to the effect of the latent heat of evaporation due to the adhesion of water droplets, and the effective cooling effect can be enhanced.

  As described above, in the air compressor 100 according to the first embodiment, since the first drain water and the second drain water are sprinkled on the outer surface of the water cooler 50, the water cooler is caused by the latent heat of evaporation of the sprinkled water. The temperature of the drain water circulating at 50 can be lowered. Moreover, since not only 1st drain water but 2nd drain water can also be utilized, the water amount shortage of drain water does not arise. Furthermore, since the heat exchange of the water cooler 50 can be assisted by the latent heat of evaporation of the drain water to be dispersed, the power in the water cooler 50 can be suppressed. As a result, it is possible to provide the air compressor 100 that is compact and can suppress the power of the water cooler 50 and improve the cooling effect while ensuring a sufficient amount of drain water even when water is sprayed.

  Moreover, since the salt concentration of the 1st drain water stored in the 1st gas-liquid separation tank 20 can be detected with the electrical conductivity detection apparatus 22, the stain | pollution | contamination of drain water can be recognized and water near pure water is used. As a result, it is possible to prevent impurities from adhering to the heat exchange portion of the water cooler 50 and to use it for a long time.

(Second Embodiment)
FIG. 7 is a schematic diagram illustrating an example of a configuration of an air compressor 100a including an air-cooled heat exchanger according to the second embodiment.

  The air compressor 100a provided with the air-cooled heat exchanger shown in FIG. 7 differs from the air compressor 100 of FIG. 1 in the following points.

  7 is provided with a pipe P8 instead of the pipe P7 of FIG. The pipe P8 extends from the lower part of the first gas-liquid separation tank 20 to above the water cooler 50.

The piping P8 is provided with an electromagnetic valve 65 and a plurality of watering nozzles 60. When the electromagnetic valve 65 is opened, water spraying from the water spray nozzle 60 to the water cooler 50 is started, and when the electromagnetic valve 65 is closed, water spraying from the water spray nozzle 60 to the water cooler 50 is stopped. Is done. In the present embodiment, when the measured value of the electrical conductivity in the electrical conductivity meter 22 exceeds 200 mg CaCO 3 / L in total hardness, the electromagnetic valve 65 is set to shift from opening to shielding. In addition, when the measured value of the electrical conductivity in the electrical conductivity meter 22 was less than 200 mg CaCO 3 / L in total hardness, the electromagnetic valve 65 was set to shift from shielding to opening.

In the present embodiment, the control device is not provided, but the present invention is not limited to this, and the control device may receive a signal from the electric conductivity meter 22 to control the opening or shielding of the electromagnetic valve 65. . Furthermore, in the present embodiment, when the measured value of electrical conductivity exceeds 200 mg CaCO 3 / L in total hardness, the opening of the electromagnetic valve 65 is shifted to shielding, but the present invention is not limited to this. Any numerical value may be used as a reference. Further, the reference value at the time of transition from opening to shielding and at the time of transition from shielding to opening may be different.

  Thereby, the drain water sprayed from the water spray nozzle 60 becomes the drain water from the first gas-liquid separation tank 20 before cooling, and only the drain water supplied from the second gas-liquid separation tank 90 is supplied to the screw compressor 10. Supplied. Since the drain water supplied from the second gas-liquid separation tank 90 is close to pure water, there is an advantage in using it as a cooling medium or a lubricant for the screw compressor 10.

  As described above, in the air compressor 100a according to the second embodiment, since the first drain water and the second drain water are sprinkled on the outer surface of the water cooler 50, the water cooler is caused by the latent heat of evaporation of the sprinkled water. The temperature of the drain water circulating at 50 can be lowered. Moreover, since not only 1st drain water but 2nd drain water can also be utilized, the water amount shortage of drain water does not arise. Furthermore, since the heat exchange of the water cooler 50 can be assisted by the latent heat of evaporation of the drain water to be dispersed, the power in the water cooler 50 can be suppressed. As a result, it is possible to provide an air compressor 100a that is compact and can suppress the power of the water cooler 50 and improve the cooling effect while ensuring a sufficient amount of drain water even when water is sprayed.

(Example 1)
Hereinafter, using the air compression apparatus 100 according to the first embodiment, an experiment was conducted on the relationship between the diameter of the water droplet sprayed from the water spray nozzle 60 and the terminal velocity.

As shown in FIG. 4, a watering nozzle 60 is provided below the water cooler 50, and wind is supplied from below the water cooler 50 by the sirocco fan 40. That is, drain water was jetted vertically upward from the watering nozzle 60. The amount of drain water is adjusted to 1.2 × 10 −3 kg / s, and once through the water cooler 50, the amount of drain water combined with circulating water flowing to the pipe P2 is 2.4 × 10. The flow rate adjustment valve 30 was adjusted to be −3 kg / s (0.2% of circulating water). In this case, the dripping state of the drain water sprayed from the water spray nozzle 60 from the piping P7 was confirmed using the ring-shaped spray nozzle.

  As shown in Table 1, when the diameter of the water droplet from the watering nozzle 60 is 2 mm, the terminal speed is 7.1 m / s, and when the diameter of the water droplet from the watering nozzle 60 is 1 mm, the terminal speed is 4.2 m. When the water droplet diameter from the water spray nozzle 60 is 500 μm, the terminal velocity is 2.1 m / s, and when the water droplet diameter from the water nozzle 60 is 100 μm, the terminal velocity is 0.4 m / s. Met.

As described above, the amount of drain water is adjusted to be 1.2 × 10 −3 kg / s, the amount of drain water combined with circulating water that passes through the water cooler 50 and flows to the pipe P2 is When the flow rate adjustment valve 30 is adjusted to be 2.4 × 10 −3 kg / s (0.2% of circulating water), the diameter of the water droplets from the watering nozzle 60 is preferably about 100 μm or more. all right.

(Example 2)
Next, a simulation of the air velocity distribution from the sirocco fan 40 to the outlet of the water cooler 50 was performed.

  FIG. 8 is an air velocity distribution diagram of cooling air from the sirocco fan 40 to the outlet of the water cooler 50. The vertical axis represents the velocity intensity (m / s), and increases as it approaches red, and decreases as it approaches blue.

  As shown in FIG. 8, in the part (refer FIG. 5) corresponded to the blower outlet of the sirocco fan 40, it turned out that an airflow speed is large, and an airflow speed falls gradually, so that it goes to the circumference | surroundings.

  From the above, it was found that the water cooler 50 in contact with the portion corresponding to the outlet of the sirocco fan 40 has a high heat exchange rate. Moreover, it can be expected that the heat exchange rate can be improved in the entire water cooler 50 by spraying water from the watering nozzle 60 to the surrounding portions.

  In the first and second embodiments, the water cooler 50 corresponds to an air-cooled heat exchanger, the air compressor 100 corresponds to an air compressor, the screw compressor 10 corresponds to a screw compressor, and the first The gas-liquid separation tank 20 corresponds to a first gas-liquid separation tank, the fluid in the first gas-liquid separation tank 20 corresponds to a first drain water, the water cooler 50 corresponds to an air-cooled heat exchanger, piping P51 and the plurality of radiating fins 52 correspond to the heat exchange section, the pipes P2, P3, P4, P5 and P6 correspond to the first circulation path, the dryer 70 and the cooling fan 80 correspond to the dryer, and the second air The liquid separation tank 90 corresponds to the second gas-liquid separation tank, the fluid in the second gas-liquid separation tank 90 and the drain tank 95 corresponds to the second drain water, and the pipes P11, P12, P13, and P14 are the first. Corresponding to the circulation path, the watering nozzle 60 corresponds to the watering nozzle, the electric conductivity meter 22 corresponds to the electric conductivity detector, and the pipe P8 corresponds to the branch pipe connected to the upstream side of the air-cooled heat exchanger. The pipe P7 corresponds to a branch pipe connected to the downstream side of the air-cooled heat exchanger, and the sirocco fan 40 corresponds to a fan and a sirocco fan.

  Although the present invention has been described in the above preferred first and second embodiments, the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

The schematic diagram which shows an example of a structure of the air compressor provided with the water cooler which concerns on 1st Embodiment. Schematic diagram showing an example of a screw compressor Diagram showing an example of the internal structure of a water cooler The figure which shows the other example of the internal structure of the water cooler of FIG. Explanatory drawing which shows an example of the mutual positional relationship of a sirocco fan and a water cooler Explanatory drawing which shows the spray position of the drain water sprayed from the watering nozzle further in the mutual positional relationship of FIG. The schematic diagram which shows an example of a structure of the air compressor provided with the air-cooling type heat exchanger which concerns on 2nd Embodiment. Airflow velocity distribution chart of cooling air from sirocco fan to water cooler outlet

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Screw compressor 20 1st gas-liquid separation tank 22 Electrical conductivity meter 40 Sirocco fan 50 Water cooler 60 Water spray nozzle 70 Dryer 80 Cooling fan 90 2nd gas-liquid separation tank 95 Drain tank 100 Air compressor P2, P3, P4, P5 , P6 piping P7, P8 piping P11, P12, P13, P14 piping

Claims (8)

  1. In an air compressor equipped with an air-cooled heat exchanger,
    Compressed air containing moisture discharged from the screw compressor is supplied to the first gas-liquid separation tank, and the moisture of the compressed air is separated by the first gas-liquid separation tank and stored as first drain water, A first circulation path through which first drain water is recirculated to the screw compressor via an air-cooled heat exchanger;
    The compressed air separated by the first gas-liquid separation tank is supplied to the second gas-liquid separation tank via a dryer, and the moisture of the compressed air is condensed by the second gas-liquid separation tank. A second circulation path that is stored as second drain water, and wherein the second drain water is recirculated downstream of the first gas-liquid separation tank;
    An air compression apparatus comprising: a watering nozzle that sprays at least one of the first drain water and the second drain water onto an outer surface portion of the air-cooled heat exchanger.
  2. The first gas-liquid separation tank includes:
    The air compression apparatus according to claim 1, further comprising an electric conductivity detection device that detects electric conductivity of the liquid.
  3. The watering nozzle is
    The air compressor according to claim 1 or 2, wherein the air compressor is provided in a branch pipe connected to the upstream side of the air-cooled heat exchanger in the first circulation path.
  4. The watering nozzle is
    The air compressor according to claim 1 or 2, wherein the air compressor is provided in a branch pipe connected to the downstream side of the air-cooled heat exchanger in the first circulation path.
  5. The air-cooled heat exchanger is further provided with a fan capable of supplying air cooling air,
    The watering nozzle is provided so as to be able to spray at least one of the first drain water and the second drain water along the direction of gravity with respect to the air-cooled heat exchanger,
    The said fan was provided so that the air for an air cooling could be given with respect to the heat exchanger part of the said air-cooling type heat exchanger along the direction opposite to the said gravitational direction. The air compression apparatus of any one of Claim 4.
  6. The air-cooled heat exchanger is further provided with a fan capable of supplying air cooling air,
    The watering nozzle is provided so as to be able to spray at least one of the first drain water and the second drain water along the direction opposite to the direction of gravity with respect to the air-cooled heat exchanger,
    The said fan is provided so that the air for an air cooling can be given with respect to the heat exchanger part of the said air-cooling type heat exchanger from the same direction as the spraying direction of the said watering nozzle. The air compressor according to any one of claims 1 to 4.
  7.   The air compressor according to claim 5 or 6, wherein the fan is a sirocco fan.
  8.   The speed of the wind given from the fan and the water spray so that the vertical downward end speed is greater than zero when the air resistance and gravity of the water droplets sprayed from the water spray nozzle are balanced and move at a constant speed. 6. The air compressor according to claim 5, wherein the initial velocity of the water droplets sprayed from the nozzle and the diameter of the water droplets are adjusted.
JP2007012424A 2007-01-23 2007-01-23 Air compression device Pending JP2008180100A (en)

Priority Applications (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7971369B2 (en) * 2004-09-27 2011-07-05 Roy Studebaker Shrouded floor drying fan
CN104564688A (en) * 2013-10-12 2015-04-29 江苏格林视通光学有限公司 Screw air compressor cooling device
WO2016052926A1 (en) * 2014-09-29 2016-04-07 이영상 Water piston device and biogas compression system using same
US9713675B2 (en) 2012-07-17 2017-07-25 Elwha Llc Unmanned device interaction methods and systems

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7971369B2 (en) * 2004-09-27 2011-07-05 Roy Studebaker Shrouded floor drying fan
US9713675B2 (en) 2012-07-17 2017-07-25 Elwha Llc Unmanned device interaction methods and systems
CN104564688A (en) * 2013-10-12 2015-04-29 江苏格林视通光学有限公司 Screw air compressor cooling device
CN104564688B (en) * 2013-10-12 2017-03-29 江苏格林视通光学有限公司 A kind of screw-rod air compressor heat sink
WO2016052926A1 (en) * 2014-09-29 2016-04-07 이영상 Water piston device and biogas compression system using same
KR101765105B1 (en) * 2014-09-29 2017-08-04 이영상 Biogas compression system using the water piston device
EP3231775A4 (en) * 2014-09-29 2018-06-20 Ltd. EcoBio Holdings Co. Water piston device and biogas compression system using same

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