JP6706446B2 - Drainage separation device and drain separation discharge system - Google Patents

Description

The present invention relates to a wastewater separation device that discharges wastewater containing foreign matter. The present invention also relates to a drain separating/exhausting device connected to a heat exchanger in the air separating device.

A conventionally known air separation device includes a raw material air compressor that pressurizes the raw material air and a heat exchanger that is integrally incorporated in the raw material air compressor. Liquefied nitrogen, liquefied oxygen, etc. are manufactured by refining and rectifying the compressed raw material air cooled by this heat exchanger.

Condensed water (drain) is generated as the compressed air is cooled by the heat exchanger (see, for example, Patent Document 1). Condensed water (drain) is discharged from a drain nozzle attached to the bottom of the heat exchanger. An air trap is attached to the drain nozzle so that condensed water accumulated in the air trap is discharged.

There is a free float type float valve as an air trap. The basic configuration is disclosed in, for example, Japanese Patent Publication No. 59-32718 (see Patent Document 2).

JP, 2004-108653, A Japanese Patent Publication No. 59-32718

In the float valve of the air trap, when the condensed water (drain) flowing from the inlet accumulates in the sump chamber, the float in the sump chamber floats up, and the valve seat opening is adjusted by the water level of the condensed water (drain). Drain) is discharged from the outlet. However, the condensed water (drain) may contain foreign matter in the raw material air or rust in the compressor or the heat exchanger. The mixing of these foreign matters and rust blocks the flow path in the air trap or hinders the operation of the float, which causes the air trap to malfunction.

If the air trap fails, the condensed water (drain) cannot be discharged. As a result, the liquid level of the condensed water (drain) in the heat exchanger rises, which affects the compression of air and the cooling performance of air in the heat exchanger, and the entire air separation device stops. become.

Therefore, the development of an effective drain separation system that reduces the influence on the operation of the air separation device due to the failure of the air trap is strongly desired.

In view of the above situation, an object of the present invention is to provide a drain separation/emission system capable of suppressing deterioration in the performance of a heat exchanger caused by blockage or failure of an air trap. Further, the present invention provides a waste water separation device that can effectively discharge waste water even if a defect of an air trap caused by a foreign substance occurs.

The present invention can be realized as the following aspects or application examples.

The present invention is a wastewater separation device for discharging wastewater containing foreign matter,
A separator,
A drainage inlet installed on top of the separator,
A first outlet that is installed below the drain inlet and at a position higher than the bottom of the separator;
A second outlet that is installed above the first outlet and below the drain inlet;
A first air trap connected to the first outlet,
A second air trap connected to the second outlet.

Further, the present invention is a drain separation and discharge device for separating and discharging condensed water generated in a heat exchanger,
Drain separator,
A drain inlet installed on the drain separator,
A first drain outlet that is installed below the drain inlet and at a position higher than the bottom of the drain separator;
A second drain outlet that is installed above the first drain outlet and below the drain inlet;
A first air trap connected to the first drain outlet;
A second air trap connected to the second drain outlet.
It is a structure corresponding to the structure in the said wastewater separation device as follows.
The drain separator corresponds to the separator, the drain inlet corresponds to the drainage inlet, the first drain outlet corresponds to the first outlet, and the second drain outlet corresponds to the second outlet.

In the present invention, a liquid level detection unit installed at a position higher than the drain inlet may be further provided.
In the above-mentioned embodiment, the water level for detecting that the liquid level detecting unit is a warning is relatively lower than the height of the heat transfer tubes (for example, tube nests) of the heat exchanger, and the drain inlet. May be configured to be relatively lower than the water level at which the liquid level detection unit detects that it is a warning and relatively higher than the inner bottom of the heat exchanger.

In the present invention, the height of the drain inlet may be relatively lower than the height of a heat transfer tube (for example, a tube nest) of the heat exchanger, and may be relatively higher than the inner bottom portion of the heat exchanger. ..

Another aspect of the present invention is a drain separation and discharge system for separating and discharging condensed water generated in a heat exchanger,
A heat exchanger,
The above drain separation discharge device,
A pressure equalizing pipe connecting the upper part of the drain separator constituting the drain separating and discharging device and the compressed air pipe of the heat exchanger,
A drain pipe connecting the drain inlet of the drain separator and the bottom of the heat exchanger is provided.

Further, a third drain outlet installed above the second drain outlet and below the drain inlet, and a third air trap connected to the third drain outlet are further provided. Good.
Further, a fourth drain outlet installed above the third drain outlet and below the drain inlet, and a fourth air trap connected to the fourth drain outlet are further provided. Good.
That is, it may be configured to include two or more drain outlets in the vertical direction on the side surface of the drain separator and an air trap connected to each of the drain outlets.

According to the present invention, the condensed water (drain) generated in the heat exchanger is introduced into the drain separator of the drain separating and discharging device through the drain pipe. When the condensed water (drain) in the drain separator accumulates up to the water level of the height of the first air trap installed at the bottom of the at least two air traps installed vertically in the drain separator, Exhausted from the first air trap. Here, if the first air trap malfunctions due to foreign matter or rust in the drain, the drain is not discharged. In that case, the drain water level in the drain separator rises, and when the water level rises to the height of the second air trap installed above the first air trap, the drain can be discharged from the second air trap. .. Further, when the second air trap is closed, it can be configured to be discharged from the third air trap installed above the second air trap as needed. That is, it is possible to suppress the deterioration of the performance of the heat exchanger caused by the drain discharge not functioning due to the blockage of the air trap, to allow the air compressor to operate normally, and to suppress the influence on the air cooling performance. Therefore, it is possible to prevent the entire air separation device from stopping.

In addition, by visually confirming the presence or absence of drain discharge from the air traps other than the first air trap at the lowest stage, it is possible to detect the presence or absence of a failure of the air trap installed below the air trap from which the drain is discharged. be able to.
It may have a detection means for automatically detecting that the air trap is out of order or blocked instead of being visually observed. The detection means may be a flow rate sensor that detects the flow of drain discharged from the air trap.
According to the above configuration, it becomes easy to discriminate the air trap having the malfunction during the periodic inspection, and the repair work can be efficiently performed on the air trap having the malfunction. This is because it is only necessary to clean or replace the defective air trap without cleaning or replacing all the air traps.

The liquid level detection unit may be, for example, a level sensor, a level switch, or a differential pressure gauge.

A liquid level detection unit for detecting that the drain water level in the drain separator has reached a predetermined position is installed above the uppermost air trap. The phenomenon that the drain water level in the drain separator becomes higher than the installation height of the uppermost air trap occurs when all the air traps cannot be drained due to blockage or the like. Therefore, by detecting the drain water level with the liquid level detection unit (for example, a level sensor, a level switch, a differential pressure gauge, etc.), an alarm can be issued when all the air traps installed in the drain separator have failed. The drain separating/ejecting device may include, for example, an alarm unit (for example, a speaker) that issues an alarm based on a detection signal sent from the liquid level detector indicating that the predetermined height has been detected.

For example, when a level switch is used, an alarm can be issued when the water level reaches or exceeds a predetermined height, indicating that maintenance of the air trap is necessary. After the alarm is issued, it takes a certain amount of time to complete the maintenance of the air trap. For this reason, it is preferable to set the volume of the portion of the inner volume of the drain separator that is equal to or higher than the predetermined height to a configuration that can cope with a rise in the water level during maintenance. The inner volume of the drain separator and the mounting height of the air trap may be set based on the maintenance record and/or the prediction of the maintenance work time.
Also, when monitoring the water level using a level sensor or a differential pressure gauge, not only the alarm can be issued but also the water level rising speed before the alarm is issued can be checked, so the maintenance time of the air trap can be checked in advance. Can be predicted. That is, the drain separation/emission device may include a notification unit (for example, a speaker) that notifies the maintenance timing of the air trap based on the water level monitoring result obtained by the level sensor or the differential pressure gauge. .

Further, a blocking prevention mechanism may be provided on the outlet side of the drain pipe. The blockage prevention mechanism may be a U-shaped pipe. Even if foreign matter is mixed in the drain flowing from the heat exchanger side, the blocking mechanism can prevent the drain pipe from being blocked due to the foreign matter.

In the present invention, the drain pipe may have a U shape.
It is preferable that the drain pipe for leading the drain from the heat exchanger to the drain separator is U-shaped. Foreign substances such as rust are often mixed in the drain in the heat exchanger. By making the drain pipe U-shaped, foreign matters can be left inside the U-shaped drain pipe and only the supernatant can be introduced into the drain separator. As a result, troubles such as the air trap clogging can be suppressed.
The connection height of the U-shaped drain pipe on the drain separator side is lower than the height of the bottom of the heat transfer tube (for example, tube nest) in the heat exchanger and higher than the bottom of the heat exchanger. Is more desirable. By making the connection height of the drain pipe on the drain separator side higher than the inner bottom of the heat exchanger, the drain water level in the heat exchanger and the connection height of the drain pipe on the drain separator side become uniform. That is, the drain water level in the heat exchanger can be controlled to the connection height of the drain pipe on the drain separator side.
Furthermore, by setting the connection height of the drain pipe on the drain separator side to be lower than the height of the bottom of the heat transfer tube (for example, tube nest) in the heat exchanger, the water level in the heat exchanger can be increased (for example, tube nest). ) Can be adjusted to be lower than the bottom. As a result, it is possible to prevent the cooling performance of the heat exchanger from being deteriorated due to the rise of the drain water level in the heat exchanger and the contact between the heat transfer tube (for example, the tube nest) and the drain.

Further, the bottom of the drain separator may be provided with a discharge port for discharging foreign matter accumulated in the drain separator. At the time of regular inspection of the drain separating and discharging device, the valve (foreign substance discharging valve) installed at the discharge port can be opened to easily remove the foreign substance in the drain separator.

Further, the water level at which the liquid level detection unit detects the failure of all the air traps is higher than the installation position of all the air traps, and the bottom of the heat transfer tube (for example, tube nest) in the heat exchanger (the maximum of the heat transfer tubes is It may be set lower than the height of the lower point). When it is detected that the drain water level in the drain separator is higher than the installation position of all the air traps, it means that all the air traps are blocked and the drain cannot be discharged from the air trap. Based on the detection result of the detection unit, it can be determined that the failure of all the air traps has been detected.
Further, the water level in the drain separator will never be higher than the water level in the heat exchanger. Therefore, by setting the water level detected in the liquid level detection unit in the drain separator to be lower than the height of the bottom of the heat transfer tube in the heat exchanger, even if all the air traps are closed, The water level rise can be detected before the drain contacts the lowest point of the heat transfer tube.

1 is a drain separation/transportation system according to the first embodiment. 8 is a drain separation/transportation system according to the second embodiment.

Hereinafter, some embodiments of the present invention will be described. The embodiment described below describes an example of the present invention. The present invention is not limited to the following embodiments at all, and includes various modifications carried out without changing the gist of the present invention. Note that not all of the configurations described below are essential configurations of the present invention.

(Embodiment 1)
The drain separation/emission system 100 shown in FIG. 1 includes a heat exchanger 2 connected to an air separation device (not shown), and a drain discharge/separation device 1 connected to the heat exchanger 2.

A tube nest 21 is arranged inside the heat exchanger 2. When the compressed air flowing through the heat exchanger 2 comes into contact with the tube nest 21, heat exchange is performed, and the condensed water W1 gradually accumulates at the bottom of the heat exchanger 2.
The pipe L1 connected to the bottom of the heat exchanger 2 is introduced into the drain inlet 3a on the upper side wall of the drain separator 3. Although a sluice valve is provided in the pipe L1, it may not be provided as another embodiment.
As can be seen from the enlarged view, the tip T of the pipe L1 has an oblique shape (for example, a shape cut at an angle of 30 to 60°) such that the ground side has an obtuse angle and the ceiling side has an acute angle in a side view. ) To increase the cross-sectional area and turn the cross-section downward. By forming the tip T of the pipe L1 into such a shape, the tip T side of the pipe L1 is not blocked by foreign matter contained in the drain flowing from the heat exchanger 2.

The drain discharge/separation device 1 includes a drain separator 3, a drain inlet 3a installed at an upper portion of the drain separator 3, and a lower portion that is lower than the drain inlet 3a and higher than a bottom portion of the drain separator 3. A first drain outlet 3b to be installed, a second drain outlet 3c above the first drain outlet 3b, and below the drain inlet 3a, and a first air trap connected to the first drain outlet 3b. 32 and a second air trap 34 connected to the second drain outlet 3c.
In the present embodiment, the first outlet pipe L2 is connected to the first drain outlet 3b, and the sluice valve and the first air trap 32 are interposed in the first outlet pipe L2 to discharge the drain to the drain groove 50.
Further, the second outlet pipe L3 is connected to the second drain outlet 3c, and the sluice valve and the second air trap 34 are interposed in the second outlet pipe L3 to discharge the drain to the drain groove 50.

Further, the drain separator 3 is provided with a liquid level detection unit 35 at a position higher than the drain inlet 3a. In the first embodiment, the liquid level detector is composed of the level switch 35.

Further, the foreign matter discharge pipe L5 is connected to the foreign matter discharge port 3d at the bottom of the drain separator 3 by providing a discharge valve 37. Thus, by opening the discharge valve 37 at the time of regular inspection of the drain separation discharge device 1, it is possible to easily remove foreign matter accumulated on the bottom of the drain separator 3.

The pressure equalizing pipe L4 connected to the upper portion of the drain separator 3 is connected to the compressed air outlet pipe L6 of the heat exchanger 3 with a partition valve interposed. The pressure equalizing tube is provided to make the pressures in the drain separator 3 and the heat exchanger 2 uniform. In addition, a sluice valve may or may not be provided here.

According to the first embodiment, the drain W1 generated in the heat exchanger 2 is introduced into the drain separator 3 of the drain separating and discharging device 1 through the drain pipe L1. The drain W2 flowing into the air trap contains foreign substances contained in the raw material air, rust generated from the compressed air storage tank, the drain separator 3, and the like. Therefore, the air trap is apt to cause a malfunction due to the blockage of the drain flow path due to foreign matter or rust, and the phenomenon that the air trap is blocked and the drain W2 cannot be discharged occurs.

When the water level (h2) of the drain W2 in the drain separator 3 reaches the height of the first air trap 32, the condensed water W2 is discharged from the first air trap 32. Here, since the first drain outlet 3b is located at a position higher than the bottom of the drain separator 3, the drain supernatant with less foreign matter or rust mixed therein is introduced from the first drain outlet 3b to block the first air trap 32, etc. Can be reduced.

If the first air trap 32 malfunctions due to foreign matter or rust in the drain, the drain W2 is not discharged. In that case, when the drain water level (h2) in the drain separator 3 rises and rises to the height of the second air trap 34 installed above the first air trap 32, the second air trap 34 The drain W2 is discharged. Further, when the second air trap 34 is closed, the drain water level (h2) in the drain separator 3 rises, and when the level switch 35 detects the water level of the drain W2, an alarm is issued.

Further, when it is automatically detected that the first air trap 32 is malfunctioning and does not function, an alarm may be issued. Maintenance may be performed by closing the sluice valve on the upstream side of the first air trap 32.

(Embodiment 2)
FIG. 2 shows a drain discharge separation system 200 according to the second embodiment. This embodiment is an effective arrangement when there is no distance to install the drain separator 3 below the heat exchanger 2. The same reference numerals in FIGS. 1 and 2 have the same functions, and therefore a description thereof will be omitted or briefly described.

The drain pipe L1 is U-shaped. Foreign substances such as rust are often mixed in the drain inside the heat exchanger 2. By making the drain pipe L1 U-shaped, foreign matter may remain in the U-shaped drain pipe and block the pipe, so that the foreign matter is discharged from the rising position L1a. The connection height (R3) of the U-shaped drain pipe L1 on the drain separator 3 side (“connection height R3” means the height of the drain inlet 3a) is the tube nest 21 in the heat exchanger 2. The height is set to be lower than the height (R1) of the bottom and higher than the height (R2) of the bottom of the heat exchanger 2. That is, the height of the drain inlet 3a is not higher than the height (R1) of the bottom of the tube nest 21.

Further, the heat exchanger 2 and the drain separator 3 are connected by a pressure equalizing pipe L4. The connection height (R3) of the drain pipe L1 on the drain separator 3 side is set higher than the height (R2) of the inner bottom portion of the heat exchanger 2. As a result, the connection height (R3) of the drain pipe L1 on the drain separator 3 side matches the water level (h1) of the drain in the heat exchanger 2. That is, the drain water level (h1) in the heat exchanger 2 can be controlled to the connection height (R3) of the drain pipe L1 on the drain separator 3 side.

As a mechanism for discharging foreign matter from the drain pipe L1, a branch pipe L11 for discharging foreign matter that extends downward may be provided at the rising position L1a. A sluice valve is provided in the branch pipe L11. By opening this sluice valve, foreign substances accumulated in the drain pipe L1 and the branch pipe L11 can be easily removed during maintenance such as regular inspection.

The level switch 35 in the drain discharge/separation device 1 has a height (R4) for detecting the drain water level (h2) lower than the height (R1) at the bottom of the tube nest 21 in the heat exchanger 2, and It is located at a position higher than the connection height (R3) of the pipe L1 on the drain separator 3 side. Accordingly, even if the water level of the drain W1 in the heat exchanger 2 rises as the water level (h2) of the drain W2 in the drain separator 3 rises, the water level (h1) of the drain W1 in the heat exchanger 2 increases. The level switch 35 can issue an alarm before reaching the height (R1) of the bottom of the tube nest 21.

(Other embodiment)
Although the level switch is provided in the first or second embodiment, the present invention is not limited to this, and a level switch or a differential pressure gauge may be provided.
Although two air traps are vertically provided in the first or second embodiment, the number of air traps is not limited to this, and three or more air traps may be provided.
In the first or second embodiment, the shape of the tip T of the drain pipe L1 is not limited to that shown in FIG.

(Embodiment 3)
A wastewater separation device for discharging wastewater containing foreign matter, a separator, a drainage inlet installed in the upper portion of the separator, a lower portion that is lower than the drainage inlet and higher than the bottom portion of the separator. A first outlet connected to the first outlet, a second outlet installed above the first outlet and below the drain inlet, and a first outlet connected to the first outlet. An air trap and a second air trap connected to the second outlet are provided.
A liquid level detection unit installed at a position higher than the drainage inlet may be further provided.
The wastewater separation device of the third embodiment may include the components of the drain separation and ejection device of the first or second embodiment.

100 Drain separation and discharge system 1 Drain separation and discharge device 2 Heat exchanger 21 Tube nest 3 Drain separator 3a Drain inlet 3b First drain outlet 32 First air trap 3c Second drain outlet 34 Second air trap 35 Level switch L1 Drain pipe L2 First outlet pipe L3 Second outlet pipe L4 Pressure equalizing pipe

Claims (6)

A drain separating and discharging device for separating and discharging condensed water generated in a heat exchanger,
Drain separator,
A drain inlet installed on the drain separator,
A first drain outlet that is installed below the drain inlet and at a position higher than the bottom of the drain separator;
A second drain outlet that is installed above the first drain outlet and below the drain inlet;
A first air trap connected to the first drain outlet;
A second air trap connected to the second drain outlet;
A liquid level detection unit installed at a position higher than the drain inlet,
A drain separating and discharging device. The water level for detecting that the liquid level detection unit is a warning is relatively lower than the height of the heat transfer tube of the heat exchanger, and the height of the drain inlet is a warning for the liquid level detection unit. The drain separating and discharging device according to claim 1 , wherein the drain surface is relatively lower than a water level for detecting that there is, and is relatively higher than a heat exchanger inner bottom portion. The drain separation discharge device according to claim 1, wherein a height of the drain inlet is relatively lower than a height of a heat transfer tube of the heat exchanger and relatively higher than a bottom portion of the heat exchanger. A drain separating and discharging system for separating and discharging condensed water generated in a heat exchanger,
A heat exchanger,
A drain separation and discharge device according to any one of claims 1 to 5 ;
A pressure equalizing pipe connecting the upper part of the drain separator constituting the drain separating and discharging device and the compressed air pipe of the heat exchanger,
A system comprising: a drain pipe connecting a drain inlet of the drain separator and a bottom of the heat exchanger. The system of claim 4 , wherein the drain piping has a U-shape. A wastewater separation device for discharging wastewater containing foreign matter,
A separator,
A drainage inlet installed on top of the separator,
A first outlet that is installed below the drain inlet and at a position higher than the bottom of the separator;
A second outlet that is installed above the first outlet and below the drain inlet;
A first air trap connected to the first outlet,
A second air trap connected to the second outlet;
A liquid level detection unit installed at a position higher than the drainage inlet,
A waste water separator .

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