JP2020128845A - Drain recovery device - Google Patents

Abstract

To reduce the amount of cooling water to be supplied to a suction tank.SOLUTION: A drain recovery device 1 includes: a recovery pipe 10 into which a drain generated by the condensation of steam in a steam use apparatus 100 flows, a steam trap 15 provided in the middle of the recovery pipe 10; a recovery tank 20 that is connected to the recovery pipe 10, and into which the drain discharged from the steam trap 15 flows; a vacuum generation unit 30 that has an ejector 34 circulating the drain between the vacuum generation unit 30 and the suction tank 31, and has a sucking portion 34a communicating with the recovery tank 20 to suck reevaporated steam in the recovery tank 20 and decompress a downstream side of the steam trap 15 and discharge the drain from the steam trap 15; and a water supply part that supplies cooling water to the suction tank 31 so as to change the drain temperature of the suction tank 31 to a predetermined value lower than the drain temperature of the recovery tank 20.SELECTED DRAWING: Figure 1

Description

The present application relates to a drain recovery device.

For example, as disclosed in Patent Document 1, a drain recovery device that recovers drain (condensate) generated by condensation of steam in a steam-using device is known. This drain recovery device includes a suction mechanism connected to the steam-using device via a recovery pipe, and a steam trap provided in the middle of the recovery pipe. The drain generated in the steam-using equipment flows into the steam trap. The suction mechanism circulates the drain between the drain tank and the ejector connected to the recovery pipe to generate suction force in the ejector and reduce the pressure on the downstream side of the steam trap. Therefore, the drain that has flowed into the steam trap is discharged to the downstream side due to the pressure difference between the upstream and downstream, and is sucked and collected in the drain tank.

JP, 2016-038176, A

By the way, in the suction mechanism of the drain recovery device as described above, in order to generate the pressure difference necessary for discharging the drain in the steam trap, the drain temperature of the drain tank (that is, the temperature of the drain circulating the ejector) is It must be below a predetermined value. On the other hand, since the temperature of the drain collected from the steam-using device to the drain tank is higher than the above-mentioned predetermined value, the drain temperature of the drain tank becomes high. Therefore, by supplying the cooling water to the drain tank, the drain temperature of the drain tank is maintained below a predetermined value. However, there has been a demand to reduce the supply amount of this cooling water.

The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to reduce the amount of cooling water supplied to the drain tank of the suction mechanism.

The drain recovery device of the present application includes a recovery pipe, a steam trap, a first drain tank, a suction mechanism, and a water supply unit. The recovery pipe is connected to a device using steam, and a drain generated by condensation of the steam in the device using steam flows in. The steam trap is provided in the middle of the recovery pipe. The first drain tank is connected to the recovery pipe, and the drain discharged from the steam trap flows into the first drain tank. The suction mechanism has a second drain tank and an ejector. The ejector circulates a drain between the ejector and the second drain tank, and a suction portion communicates with the first drain tank, and sucks the re-evaporated vapor of the first drain tank to suck the re-evaporated vapor. The pressure is reduced on the downstream side to discharge the drain from the steam trap. The water supply unit supplies cooling water to the second drain tank so that the drain temperature of the second drain tank becomes a predetermined value lower than the drain temperature of the first drain tank.

According to the drain recovery device of the present application, the amount of cooling water supplied to the drain tank (second drain tank) of the suction mechanism can be reduced.

FIG. 1 is a piping system diagram showing a schematic configuration of a drain recovery device according to an embodiment. FIG. 2 is a cross-sectional view showing a schematic configuration of the recovery pump according to the embodiment. FIG. 3 is a cross-sectional view showing a main part of the recovery pump according to the embodiment.

Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, its application, or its application.

The drain recovery device 1 of the present embodiment recovers the drain generated in the steam-using device 100 and supplies the recovered drain to the user side. As shown in FIG. 1, the drain recovery device 1 includes a recovery pipe 10, a steam trap 15, a recovery tank 20 (first drain tank), a vacuum generation unit 30 (suction mechanism), a water supply unit, It is provided with a recovery pump 50 (liquid pumping device).

In the present embodiment, the drain recovery device 1 provided for a plurality of steam-using devices 100 will be described. A steam supply pipe (not shown) is connected to the steam using device 100, and steam generated by, for example, a boiler is supplied from the steam supply pipe. In the steam using apparatus 100, the supplied steam radiates heat to the object and is condensed, and the object is heated. The steam becomes drain (condensate) by condensing. That is, in the steam using apparatus 100, the object is heated by the latent heat of condensation of steam.

The recovery pipe 10 is a pipe that is connected to the steam using device 100 and into which the drain generated by condensation of the steam in the steam using device 100 flows. Specifically, the recovery pipe 10 has a plurality of outflow pipes 11 and one collecting pipe 12. One end (inflow end) of each of the plurality of outflow pipes 11 is connected to the steam-using device 100, and the other end (outflow end) thereof is connected to the collecting pipe 12. The outflow end of the collecting pipe 12 is connected to the recovery tank 20. In the recovery pipe 10, the drain generated in each steam-using device 100 flows into the outflow pipe 11, and is collected by the collecting pipe 12.

The steam trap 15 is provided in the middle of the recovery pipe 10. The steam trap 15 is provided in each outflow pipe 11. The steam trap 15 automatically discharges only the inflow drain to the downstream side due to the pressure difference between the upstream and downstream sides (difference between the upstream side pressure and the downstream side pressure). It should be noted that in actuality, the steam-trap drain flows into the steam trap 15.

The recovery tank 20 is a closed container that is connected to the recovery pipe 10 and into which the drain discharged from the steam trap 15 flows. The collecting tank 20 is connected to the outflow end of the collecting pipe 12 (collecting pipe 10) at the top thereof, and the drain flows from the collecting pipe 12 and is temporarily stored. The recovery tank 20 is divided into a lower liquid layer portion 21 and an upper gas layer portion 22. The liquid layer portion 21 is a portion in which drain is stored, and the gas layer portion 22 is a portion in which flash vapor (re-evaporated vapor) in which a part of the drain of the liquid layer portion 21 is re-evaporated is present.

The recovery pump 50 is a mechanical liquid pumping device that supplies the drain of the recovery tank 20 to the user side (for example, boiler equipment). The drain recovery device 1 has an inflow pipe 23, a pressure feed pipe 24, an air supply pipe 25, and an exhaust pipe 26, which are connected to a recovery pump 50, respectively.

The inflow pipe 23 has an inflow end connected to the bottom of the recovery tank 20 and an outflow end connected to the recovery pump 50. That is, the inflow pipe 23 communicates with the liquid layer portion 21 of the recovery tank 20. The inflow end of the pressure feed pipe 24 is connected to the recovery pump 50, and the outflow end is connected to the use side. The air supply pipe 25 has an inflow end connected to, for example, the above-described steam supply pipe, and an outflow end connected to the recovery pump 50. The exhaust pipe 26 has an inflow end connected to the recovery pump 50 and an outflow end connected to the top of the recovery tank 20. That is, the exhaust pipe 26 communicates with the gas layer portion 22 of the recovery tank 20.

The inflow pipe 23 and the pressure feeding pipe 24 are provided with check valves 27 and 28. The check valve 27 allows only the flow of drain from the recovery tank 20 to the recovery pump 50, and the check valve 28 allows only the flow of drain from the recovery pump 50 to the use side.

In the recovery pump 50, the drain of the recovery tank 20 flows in through the inflow pipe 23, and the inflow drain is pressure-fed to the user side through the pressure feed pipe 24. Further, in the recovery pump 50, high-pressure steam flows in through the air supply pipe 25, while the steam is discharged into the recovery tank 20 through the exhaust pipe 26. The detailed configuration of the recovery pump 50 will be described later.

The vacuum generating unit 30 is configured to discharge a drain from the steam trap 15 and cause the drain to flow into the recovery tank 20 by causing a predetermined pressure difference between the upstream and downstream of the steam trap 15 by a suction action. The vacuum generation unit 30 includes a suction tank 31 (second drain tank), a circulation pipe 32, a suction pump 33, and an ejector 34.

The suction tank 31 is a closed container, and a circulation pipe 32 is connected to the suction tank 31. That is, one end (upstream end) of the circulation pipe 32 is connected to the lower portion of the suction tank 31, and the other end (downstream end) is connected to the top of the suction tank 31. The circulation pipe 32 is provided with a suction pump 33 and an ejector 34 in order from the upstream end side. That is, the circulation pipe 32 is connected between the suction tank 31 and the ejector 34. The suction pump 33 is an electric liquid pumping device.

The ejector 34 circulates a drain between the ejector 34 and the suction tank 31, and a suction portion 34a communicates with the recovery tank 20 to suck the flash vapor (revaporation vapor) of the recovery tank 20 so as to suck a steam trap. The downstream side of 15 is decompressed and the drain is discharged from the steam trap 15.

Specifically, the drain recovery device 1 has a suction pipe 41 connected to the suction portion 34a of the ejector 34 and the recovery tank 20. The suction pipe 41 has an inflow end connected to the top of the recovery tank 20 and an outflow end connected to the suction unit 34a. That is, the suction section 34 a communicates with the gas layer section 22 of the recovery tank 20 via the suction pipe 41. Furthermore, the suction part 34a communicates with the downstream side of the steam trap 15 via the suction pipe 41 and the recovery tank 20.

In the vacuum generating unit 30, the drain (water) of the suction tank 31 is circulated through the circulation pipe 32 by the suction pump 33. In the vacuum generating unit 30, the drain of the suction tank 31 flows in from the inlet of the ejector 34 and flows out of the outlet, that is, the drain of the suction tank 31 passes through the ejector 34, and thus the suction of the ejector 34 is sucked. A suction action (vacuum pressure) occurs in the portion 34a. In this way, the drain action circulates between the suction tank 31 and the ejector 34, whereby the suction action of the ejector 34 occurs.

In the vacuum generation unit 30, the flash action of the ejector 34 causes the flash vapor of the recovery tank 20 to be sucked into the suction portion 34 a via the suction pipe 41 and flow into the suction tank 31. Then, the flash vapor in the recovery tank 20 is sucked into the suction portion 34a, so that the pressure on the downstream side of the steam trap 15 (including the recovery tank 20) is reduced and the drain is discharged from the steam trap 15. The drain discharged from the steam trap 15 is recovered in the recovery tank 20.

That is, the vacuum generation unit 30 sucks the flash vapor in the recovery tank 20 to generate a pressure difference between the upstream and downstream sides necessary for drain discharge in the steam trap 15, and a predetermined vacuum is applied to the downstream side of the steam trap 15. Set to depressurized state.

The water supply unit supplies the cooling water to the suction tank 31 so that the drain temperature of the suction tank 31 becomes a predetermined value lower than the drain temperature of the recovery tank 20.

The above-mentioned "predetermined value lower than the drain temperature of the recovery tank 20" causes the suction action (vacuum pressure) of the suction section 34a necessary for bringing the downstream side of the steam trap 15 into a predetermined vacuum depressurized state. Is the temperature. In the suction portion 34a of the ejector 34, when a saturation pressure (saturation pressure equivalent to the temperature) corresponding to the temperature of the drain passing therethrough is generated, the drain temperature of the suction tank 31 is supplied with water so that the saturation pressure becomes a predetermined vacuum pressure. Adjusted by department.

Specifically, the water supply unit has a water supply pipe 35, a flow rate adjustment valve 36, and a temperature sensor 37. The water supply pipe 35 is connected to the suction tank 31, and the cooling water is supplied to the suction tank 31. The temperature sensor 37 detects the drain temperature of the suction tank 31. The flow rate adjusting valve 36 is provided in the water supply pipe 35, and adjusts the flow rate of the cooling water so that the temperature detected by the temperature sensor 37 becomes the above predetermined value.

In addition, the drain recovery device 1 includes an overflow pipe 42 connected to the recovery tank 20 and the suction tank 31.

The overflow pipe 42 has an inflow end connected to the suction tank 31 and an outflow end connected to the recovery tank 20. The outflow end of the overflow pipe 42 is open to the gas layer portion 22 of the recovery tank 20. The overflow pipe 42 is a pipe through which the drain in the suction tank 31 which has exceeded a predetermined drain water level flows into the recovery tank 20.

The overflow pipe 42 is provided with a steam trap 43 and a check valve 44 in order from the suction tank 31 side. The steam trap 43 automatically discharges only the inflowing drain to the downstream side (recovery tank 20 side) due to the pressure difference between the upstream side and the downstream side. The check valve 44 allows only the flow of drain from the suction tank 31 to the recovery tank 20.

As shown in FIG. 2, the recovery pump 50 includes a casing 51 that is a closed container, an air supply valve 60 and an exhaust valve 70, and a valve operating mechanism 80.

In the casing 51, the main body 52 and the lid 53 are joined by bolts, and a drain storage space 54 is formed inside. The lid 53 is provided with a drain inlet 55 and an outlet 56, and an inlet 57 and an outlet 58 for steam, which is a working gas. The inflow pipe 23 and the pressure feed pipe 24 are connected to the inflow port 55 and the discharge port 56, and the air supply pipe 25 and the exhaust pipe 26 are connected to the introduction port 57 and the exhaust port 58.

As also shown in FIG. 3, the air supply valve 60 and the exhaust valve 70 open and close the introduction port 57 and the exhaust port 58, respectively. The air supply valve 60 and the exhaust valve 70 have valve cases 61 and 71, valve bodies 62 and 72, and lifting rods 63 and 73. The valve cases 61 and 71 are formed with valve seats 64 and 74 and openings 65 and 75. The elevating rods 63 and 73 are inserted into the valve cases 61 and 71, and the valve bodies 62 and 72 are integrally provided.

In the air supply valve 60, when the lift bar 63 moves up, the valve body 62 separates from the valve seat 64 to open the inlet 57, and when the lift bar 63 descends, the valve body 62 sits on the valve seat 64 and opens. 57 is closed. In the exhaust valve 70, the valve body 72 is seated on the valve seat 74 to close the exhaust port 58 when the elevating rod 73 rises, and when the elevating rod 73 descends, the valve body 72 separates from the valve seat 74 and the exhaust port 58. Open up. A valve operating rod 76 is connected to the lower end of the elevating rod 73, and a continuous plate 77 is attached to the valve operating rod 76. The elevating rod 63 is pushed up by the connecting plate 77 when the valve operating rod 76 rises and ascends, and descends by its own weight when the valve operating rod 76 descends.

The valve operating mechanism 80 is provided in the casing 51, and moves the valve operating rod 76 up and down to operate the air supply valve 60 and the exhaust valve 70. The valve actuation mechanism 80 has a float 81 and a snap mechanism 90.

A lever 82 rotatably supported by a shaft 83 of a bracket 84 is attached to the float 81. The snap mechanism 90 includes a float arm 91, a sub arm 92, a coil spring 93, and receiving members 94a and 94b. One end of the float arm 91 is rotatably supported by the shaft 96 of the bracket 97, and the shaft 85 of the lever 82 is fitted in the groove 91a of the other end. The upper end of the sub arm 92 is rotatably supported by the shaft 96. The receiving member 94a is rotatably supported by the shaft 95a of the float arm 91, and the receiving member 94b is rotatably supported by the shaft 95b of the sub arm 92. A coil spring 93 is provided between the receiving members 94a and 94b, and a valve operating rod 76 is connected to a shaft 98 of the sub arm 92.

The recovery pump 50 is configured to introduce steam into the storage space 54 from the introduction port 57 and discharge the drain of the storage space 54 from the discharge port 56 by the pressure of the steam. Specifically, in the recovery pump 50, the float 81 is located at the bottom of the storage space 54 when the drain is not stored in the storage space 54. In this state, the valve operating rod 76 is lowered, the air supply valve 60 is closed and the exhaust valve 70 is open. Then, as the drain flows from the inflow port 55 and accumulates in the storage space 54, the float 81 floats. In addition, as the drain collects in the storage space 54, steam is discharged from the exhaust port 58. Then, when the drain water level in the storage space 54 reaches a predetermined high water level, the valve mechanism rod 76 is raised by the snap mechanism 90. As a result, the air supply valve 60 is opened and the exhaust valve 70 is closed.

When the air supply valve 60 is opened, steam (high-pressure steam) flows in from the introduction port 57 and is introduced into the upper part of the storage space 54 (the space above the drain). Then, the drain accumulated in the storage space 54 is pushed downward by the pressure of the introduced steam and discharged from the discharge port 56. When the drain water level in the storage space 54 decreases due to drainage, the float 81 descends. Then, when the drain water level in the storage space 54 reaches a predetermined low water level, the snap mechanism 90 causes the valve operating rod 76 to descend. As a result, the air supply valve 60 is closed and the exhaust valve 70 is opened.

<Driving operation>
In the drain recovery device 1 described above, the drain generated in the steam-using device 100 flows into the steam trap 15 via the outflow pipe 11 (recovery pipe 10). Further, in the vacuum generating unit 30, the suction pump 33 is driven, whereby the drain of the suction tank 31 circulates through the circulation pipe 32, and the suction portion 34 a of the ejector 34 has a suction action. Then, the flash vapor in the recovery tank 20 is sucked into the suction portion 34a via the suction pipe 41.

The flash vapor in the recovery tank 20 is sucked into the suction portion 34a, so that the downstream side of the steam trap 15 is depressurized, and a predetermined pressure difference is generated in the upstream and downstream of the steam trap 15. Due to this pressure difference, the drain is discharged from the steam trap 15 to the downstream side. The discharged drain flows into and is stored in the recovery tank 20 through the collecting pipe 12 (recovery pipe 10) by the suction action of the ejector 34.

In the recovery tank 20, a part of the drained inflow is re-evaporated. This re-evaporated flash vapor is sucked into the suction portion 34a as described above. The drain stored in the recovery tank 20 is supplied to the user side by the recovery pump 50. In this way, the drain generated in the steam-using device 100 is recovered in the recovery tank 20 and supplied to the user side.

On the other hand, the flash vapor sucked by the suction portion 34a flows into the suction tank 31 through the circulation pipe 32 and is condensed to become drain. The drain and flash vapor in the recovery tank 20 are high-temperature fluids that are higher than the drain temperature in the suction tank 31. Therefore, the temperature of the suction tank 31 rises as the flash vapor of the recovery tank 20 flows into the suction tank 31.

Then, cooling water is supplied from the water supply pipe 35 to the suction tank 31 so that the drain temperature of the suction tank 31 drops to a predetermined value. In this way, the drain temperature of the suction tank 31 is maintained at a predetermined value.

Here, the degree of increase in the drain temperature due to the inflow of flash vapor in the suction tank 31 will be described in comparison with the conventional form in which the drain flows.

The volume flow rate (that is, the volume per unit time sucked by the suction unit 34a) flowing into the suction tank 31 is the same for the flash vapor and the drain (hereinafter, both). The density of the drain is much (hundreds of times) higher than that of the flash vapor. Therefore, the mass flow rate (density×volume flow rate) flowing into the suction tank 31 is much higher in the drain than in the flash steam. On the other hand, the enthalpy (latent heat) of flash vapor is slightly (several times) higher than the enthalpy (sensible heat) of drain.

From the above, the amount of heat flowing into the suction tank 31 per unit time (enthalpy×mass flow rate) is lower in flash vapor than in drain. Therefore, in the present embodiment in which the flash vapor flows into the suction tank 31, the degree of increase in the drain temperature in the suction tank 31 is suppressed as compared with the conventional configuration in which the drain flows. Therefore, the amount of cooling water supplied from the water supply pipe 35 is reduced.

Since the flush steam and the cooling water flow into the suction tank 31, the drain water level gradually rises. Then, when the drain exceeds the predetermined drain water level, it flows into the recovery tank 20 through the overflow pipe 42.

Similar to the downstream side of the steam trap 15, the inside of the recovery tank 20 is in a vacuum reduced pressure state by the suction action of the ejector 34. Therefore, a pressure difference is generated in the upstream and downstream of the steam trap 43 in the overflow pipe 42, and the drain is reliably discharged from the steam trap 43 and flows into the recovery tank 20.

As described above, the drain recovery device 1 of the above-described embodiment includes the recovery tank 20 (first drain tank) that is connected to the recovery pipe 10 and into which the drain discharged from the steam trap 15 flows. In the drain recovery device 1, the drain circulates between the suction tank 31 (second drain tank) and the suction tank 31, and the suction unit 34a communicates with the recovery tank 20. The drain temperature of the suction tank 31 and the vacuum generation unit 30 having the ejector 34 that depressurizes the downstream side of the steam trap 15 by sucking the re-evaporated vapor of 20 to discharge the drain from the steam trap 15. A water supply pipe 35 (water supply unit) for supplying cooling water to the suction tank 31 so as to have a predetermined value lower than the drain temperature of the recovery tank 20 is provided.

According to the above configuration, since the flash vapor flows into the suction tank 31 of the vacuum generation unit 30, the increase in the drain temperature in the suction tank 31 is suppressed as compared with the conventional case where the drain flows. be able to. Therefore, the amount of cooling water supplied to the suction tank 31 can be reduced.

Further, the drain recovery device 1 of the above-described embodiment includes a recovery pump 50 (liquid pressure supply device) that supplies the drain of the recovery tank 20 to the user side. With this configuration, it is possible to supply the drain having a higher temperature than the conventional one to the user side. In other words, conventionally, the low temperature drain cooled by the cooling water was supplied in the vacuum generating unit, but in the above embodiment, the high temperature drain before being cooled can be supplied.

Further, the drain recovery device 1 of the above-described embodiment is connected to the recovery tank 20 and the suction tank 31, and connects the overflow pipe 42 in which the drain, which exceeds the predetermined drain water level in the suction tank 31, flows to the recovery tank 20. I have it. With this configuration, the drain of the vacuum generating unit 30 can be supplied to the user side without waste.

Further, the overflow pipe 42 is provided with a steam trap 43. Therefore, only the drain can be made to flow from the suction tank 31 to the recovery tank 20.

Further, according to the drain recovery device 1 of the above-described embodiment, the recovery pump 50 communicates with the recovery tank 20, and the inflow port 55 into which the drain of the recovery tank 20 flows, the drain discharge port 56, and the steam ( And a casing 51 in which a drain storage space 54 is formed. The recovery pump 50 is configured to introduce steam into the storage space 54 from the introduction port 57 and discharge the drain of the storage space 54 from the discharge port 56 by the pressure of the steam.

According to the above configuration, since the drain discharge operation is performed by using the pressure of steam (pressure energy) as a power source, the collected drain can be supplied to the user side without using electric power (electrical energy). Therefore, the power consumption of the drain recovery device 1 can be reduced.

The overflow pipe 42 may be omitted in the drain recovery device 1 of the above embodiment. In that case, the drain in the suction tank 31 that has exceeded the predetermined drain water level is discarded to the outside, for example.

Further, in the drain recovery device 1 of the above embodiment, the drain of the suction tank 31 may be supplied to the user side by the suction pump 33.

The technique disclosed in the present application is useful for a drain recovery device.

1 Drain recovery device 10 Recovery pipe 15 Steam trap 20 Recovery tank (first drain tank)
30 Vacuum generation unit (suction mechanism)
31 Suction tank (second drain tank)
34 Ejector 34a Suction part 35 Water supply pipe (water supply part)
42 Overflow pipe 43 Steam trap 50 Recovery pump (liquid pumping device)
51 Casing 54 Storage Space 55 Inlet 56 Outlet 57 Inlet 100 Steam Equipment

Claims (5)

A recovery pipe connected to a steam-using device, into which a drain generated by condensation of steam in the steam-using device flows,
A steam trap provided in the middle of the recovery pipe,
A first drain tank connected to the recovery pipe, into which the drain discharged from the steam trap flows;
The drain circulates between the second drain tank and the second drain tank, and the suction portion communicates with the first drain tank, and the re-evaporated vapor of the first drain tank is sucked to suck the steam. A suction mechanism having an ejector for depressurizing the downstream side of the trap to discharge the drain from the steam trap;
A water supply unit for supplying cooling water to the second drain tank so that the drain temperature of the second drain tank becomes a predetermined value lower than the drain temperature of the first drain tank. Drain recovery device. The drain recovery device according to claim 1,
A drain recovery device comprising a liquid pressure-feeding device for supplying the drain of the first drain tank to the user side. The drain recovery device according to claim 2,
A drain, which is connected to the first drain tank and the second drain tank, and is provided with an overflow pipe in which a drain that exceeds a predetermined drain water level in the second drain tank flows into the first drain tank. Recovery device. The drain recovery device according to claim 3,
The drain recovery device, wherein the overflow pipe is provided with a steam trap. The drain recovery device according to claim 2,
The liquid pumping device is provided with an inflow port communicating with the first drain tank, into which the drain of the first drain tank flows, a drain discharge port, and a working gas introduction port. Characterized in that it has a casing formed, is configured to introduce a working gas into the storage space from the introduction port, and to discharge the drain of the storage space from the discharge port by the pressure of the working gas. Drain collection device.

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