JP2017003235A - Drain recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a suction mechanism in a drain recovery device.SOLUTION: A drain recovery device comprises a vacuum generation unit 5 (a suction mechanism) that recovers drain generated in steam-using apparatuses 2B, through a recovery pipe 4. The vacuum generation unit 5 comprises a drain tank 5A, an ejector 5C connected to the recovery pipe 4, and first and second pumps 5D, 5F. The pumps 5D, 5F each comprise a casing that has a drain inflow port, a drain discharge port, and a steam introduction port 16, and in which a storage space for drain is formed, introduces steam into the storage space from the steam introduction port, and discharges drain in the storage space from the drain discharge port by using the pressure of the steam. In the vacuum generation unit 5, while drain in the drain tank 5A is circulated between the same and the ejector 5C by the first pump 5D to suck drain from the recovery pipe 4 into the ejector 5C, drain in the drain tank 5A is supplied to the utilization side by the second pump 5F.SELECTED DRAWING: Figure 1

Description

  The present application relates to a drain recovery device that recovers drain generated in steam-using equipment.

  For example, as disclosed in Patent Document 1, a drain recovery device (condensate 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 (condensate recovery pump) connected to a steam-using device via a pipe. In this suction mechanism, an ejector and a circulation pump are connected via a circulation pipe. The suction port of the ejector is connected to the steam using device via a pipe. In the suction mechanism, drain is supplied to the inflow port of the ejector by the circulation pump and discharged from the outflow port of the ejector, whereby a suction action is generated at the suction port of the ejector. Due to the suction action of the ejector, drain is sucked from the steam-using device to the suction mechanism and collected. That is, the suction mechanism generates a suction action by circulating the drain between the circulation pump and the ejector. In the suction mechanism, a part of the collected drain is supplied to the use side (boiler) by a circulation pump.

JP 2000-356305 A

  By the way, in the suction mechanism of the drain recovery device described above, a circulation pump that is an electric pump is used, and there has been a demand to reduce power consumption as much as possible.

  The technology disclosed in the present application has been made in view of such circumstances, and an object thereof is to reduce the power consumption of the suction mechanism in the drain recovery device.

  The technology disclosed in the present application is premised on a drain recovery device that is connected to a steam using device that condenses steam through a recovery pipe and includes a suction mechanism that recovers drain generated by the condensation of steam in the steam using device. . The suction mechanism includes a drain tank, an ejector connected to the recovery pipe, and first and second pumps. The first and second pumps include a casing having a drain inlet and outlet and a working gas inlet and having a drain storage space formed therein. And the said 1st and 2nd pump introduce | transduces working gas into the said storage space from the said inlet, and discharges the drain of the said storage space from the said discharge port with the pressure of this working gas. And the said suction mechanism is comprised so that the drain of the said drain tank may be circulated between the said ejectors with the said 1st pump, and a drain may be sucked and collected from the said collection pipe | tube to the said ejector. Further, the suction mechanism is configured to supply the drain of the drain tank to the use side by the second pump.

  As described above, according to the drain recovery apparatus of the present application, the drain of the drain tank is circulated between the drain and the ejector by the first pump, and the suction action is generated by the circulation of the drain, and the drain from the recovery pipe to the ejector is generated. Is collected by suction. On the other hand, in the drain recovery apparatus of the present application, the drain of the drain tank is supplied to the use side such as a boiler by the second pump. In both the first and second pumps, the drain of the storage space is discharged to the outside by the pressure of the introduced working gas (for example, steam). That is, the first and second pumps perform a drain discharge operation (pump operation) using the pressure (pressure energy) of the working gas as a power source. Therefore, it is possible to construct a suction mechanism capable of sucking and collecting the drain from the steam-using device and supplying the collected drain to the user side without using electric power (electric energy). Therefore, the drain recovery device of the present application can reduce the power consumption of the suction mechanism.

FIG. 1 is a piping system diagram illustrating a schematic configuration of a steam system according to an embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the liquid pumping apparatus according to the embodiment. FIG. 3 is a cross-sectional view showing a main part of the liquid pumping apparatus 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, applications thereof, or uses thereof.

  As shown in FIG. 1, the steam system 1 of the present embodiment includes a steam use system 2 and a drain recovery system 3. The drain recovery system 3 constitutes a drain recovery device according to the claims of the present application.

  A plurality of steam use systems 2 (three in this embodiment) are provided. Each steam use system 2 includes a steam use device 2B, and a steam supply pipe 2A is connected to the steam use device 2B. The supply pipe 2A is connected to, for example, a boiler (not shown), and steam generated by the boiler is supplied to the steam using device 2B. The supply pipe 2A is provided with a supply valve 2C for adjusting the flow rate of the steam. The steam using device 2B is, for example, a heat exchanger, and the steam supplied from the supply pipe 2A dissipates heat to the object and condenses, and the object is heated. The steam becomes drain (condensate) by condensing. That is, in the steam using device 2B, the object is heated (latent heat heating) by the latent heat of condensation of the steam.

  The drain recovery system 3 includes a recovery pipe 4 and a vacuum generation unit 5, and recovers the drain generated by the condensation of steam in the three steam-using devices 2B.

  The collection pipe 4 includes three outflow pipes 4B and one collecting pipe 4A. Each of the three outflow pipes 4B has one end (inflow end) connected to the steam using device 2B and the other end (outflow end) connected to the collecting pipe 4A. The collecting pipe 4 </ b> A has an outflow end connected to the vacuum generation unit 5. In the recovery pipe 4, the drain generated in each steam-using device 2B flows into the outflow pipe 4B and collects in the collecting pipe 4A. Each outflow pipe 4B is provided with a steam trap 4C. The steam trap 4C automatically discharges only the drained water to the downstream side due to the upstream and downstream pressure difference (difference between the upstream pressure and the downstream pressure). Actually, steam-mixed drain flows into the steam trap 4C.

  The vacuum generation unit 5 includes a drain tank 5A, a circulation pipe 5B, an ejector 5C, and two pumps 5D and 5F (first pump 5D and second pump 5F). This constitutes the suction mechanism. The vacuum generation unit 5 is connected to the three steam using devices 2B via the recovery pipe 4, and sucks and collects the drain generated in each steam using device 2B.

  The drain tank 5 </ b> A stores the drain recovered through the recovery pipe 4. The circulation pipe 5B is connected to the drain tank 5A. That is, the circulation pipe 5B has one end (inflow end) connected to the lower portion of the drain tank 5A and the other end (outflow end) connected to the upper portion of the drain tank 5A. The circulation pipe 5B is provided with a first pump 5D and an ejector 5C in order from the upstream side (inflow end side). In the vacuum generation unit 5, the collecting tube 4A of the recovery tube 4 is connected to the suction port of the ejector 5C.

  In the vacuum generation unit 5, the drain (water) of the drain tank 5A is circulated through the circulation pipe 5B by the first pump 5D. In the vacuum generation unit 5, the water in the drain tank 5A is supplied to the inflow port of the ejector 5C by the first pump 5D and discharged from the outflow port of the ejector 5C, whereby a suction action is generated at the suction port of the ejector 5C. It is configured as follows. The vacuum generation unit 5 reduces the pressure downstream of the steam trap 4C in the recovery pipe 4 by the suction action of the ejector 5C, and recovers the drain discharged from the steam trap 4C. That is, the vacuum generation unit 5 causes the ejector 5C to perform a suction action by circulating the drain of the drain tank 5A with the first pump 5D.

  In the vacuum generation unit 5, the second pump 5F is connected to the drain tank 5A via the inflow pipe 5E and connected to the use side (not shown) via the discharge pipe 5G. An example of the use side is a boiler water supply tank. The vacuum generation unit 5 is configured to supply the drain of the drain tank 5A to the usage side by the second pump 5F.

<Pump configuration>
Both the first and second pumps 5D and 5F have the same configuration, and are liquid pumping apparatuses that introduce a working gas and perform a drain discharge operation using the pressure of the working gas. As shown in FIG. 2, the pumps 5 </ b> D and 5 </ b> F include a casing 10 that is a sealed container, an air supply valve 20 and an exhaust valve 30, and a valve operating mechanism 40.

  In the casing 10, the main body portion 11 and the lid portion 12 are coupled by a bolt, and a drain storage space 13 is formed therein. A drain inlet 14 through which drain flows, a drain outlet 15 through which drain is discharged, a steam inlet 16 through which steam as working gas is introduced, and steam as working gas are discharged into the lid 12. A steam outlet 17 is provided. The drain inlet 14 is provided near the upper portion of the lid portion 12, and the drain discharge port 15 is provided at the lower portion of the lid portion 12. Both the steam inlet 16 and the steam outlet 17 are provided in the upper part of the lid 12. These drain inlets 14 and the like are all in communication with the storage space 13. In the first pump 5D, the drain inlet 14 and the drain outlet 15 are connected to the circulation pipe 5B. In the second pump 5F, the drain inlet 14 is connected to the inlet pipe 5E, and the drain outlet 15 is connected to the outlet pipe 5G. In the first and second pumps 5D and 5F, the steam inlet 16 is connected to a steam supply pipe (not shown) provided in the steam system 1.

  As shown in FIG. 3, an air supply valve 20 is provided at the steam inlet 16, and an exhaust valve 30 is provided at the steam outlet 17. The supply valve 20 and the exhaust valve 30 open and close the steam inlet 16 and the steam outlet 17, respectively. The air supply valve 20 includes a valve case 21, a valve body 22, and a lifting rod 23. The valve case 21 has a through hole in the axial direction, and a valve seat 24 is formed above the through hole. An opening 25 through which the through hole communicates with the outside is formed in the middle portion of the valve case 21. The valve body 22 is formed in a spherical shape, and is integrally provided at the upper end of the lifting rod 23. The elevating rod 23 is inserted into the through hole of the valve case 21 so as to be movable up and down. When the elevating rod 23 is raised, the air supply valve 20 is separated from the valve seat 24 and the steam inlet 16 is opened. When the elevating rod 23 is lowered, the valve body 22 is seated on the valve seat 24 and steam. The inlet 16 is closed. The exhaust valve 30 includes a valve case 31, a valve body 32, and a lifting rod 33. The valve case 31 has a through hole in the axial direction, and a valve seat 34 is formed slightly above the through hole. The valve case 31 is formed with an opening 35 through which the through hole communicates with the outside. The valve body 32 is formed in a substantially hemispherical shape, and is provided integrally with the upper end of the elevating rod 33. The elevating rod 33 is inserted into the through hole of the valve case 31 so as to be movable up and down. When the elevating rod 33 is raised, the exhaust valve 30 is seated on the valve seat 34 and the steam discharge port 17 is closed. When the elevating rod 33 is lowered, the valve body 32 is separated from the valve seat 34 and the steam exhaust is released. The outlet 17 is opened.

  A valve operating rod 36 is connected to the lower end of the lifting rod 33 of the exhaust valve 30. That is, the raising / lowering rod 33 of the exhaust valve 30 moves up and down as the valve operation rod 36 moves up and down. The valve operating rod 36 is attached with a continuous plate 37 that extends to a region below the lifting rod 23 of the air supply valve 20. The raising / lowering rod 23 of the air supply valve 20 is pushed up by the connecting plate 37 when the valve operating rod 36 is raised, and rises. When the valve operating rod 36 is lowered, the connecting plate 37 is also lowered so that it is lowered by its own weight. That is, when the valve operating rod 36 is raised, the air supply valve 20 is opened while the exhaust valve 30 is closed. When the valve operating rod 36 is lowered, the air supply valve 20 is closed while the exhaust valve 30 is opened.

  The valve operating mechanism 40 is provided in the casing 10 and opens and closes the air supply valve 20 and the exhaust valve 30 by moving the valve operating rod 36 up and down. The valve operating mechanism 40 includes a float 41 and a snap mechanism 50.

  The float 41 is formed in a spherical shape, and a lever 42 is attached thereto. The lever 42 is rotatably supported by a shaft 43 provided on the bracket 44. The lever 42 is provided with a shaft 45 at the end opposite to the float 41 side. The snap mechanism 50 includes a float arm 51, a sub arm 52, a coil spring 53, and two receiving members 54 and 55. One end of the float arm 51 is rotatably supported by a shaft 58 provided on the bracket 59. The brackets 44 and 59 are coupled to each other by screws and attached to the lid portion 12. A groove 51a is formed at the other end of the float arm 51, and the shaft 45 of the lever 42 is fitted in the groove 51a. With this configuration, the float arm 51 swings about the shaft 58 as the float 41 moves up and down.

  The float arm 51 is provided with a shaft 56. The sub arm 52 has an upper end portion rotatably supported by a shaft 58 and a lower end portion provided with a shaft 57. The receiving member 54 is rotatably supported on the shaft 56 of the float arm 51, and the receiving member 55 is rotatably supported on the shaft 57 of the sub arm 52. A compressed coil spring 53 is attached between the receiving members 54 and 55. The sub arm 52 is provided with a shaft 61, and the lower end portion of the valve operating rod 36 is connected to the shaft 61.

  In the pumps 5 </ b> D and 5 </ b> F, when the drain does not accumulate in the storage space 13, the float 41 is located at the bottom of the storage space 13. In this state, the valve operating rod 36 is lowered, the air supply valve 20 is closed, and the exhaust valve 30 is open. Then, as the drain flows from the drain inlet 14 and accumulates in the storage space 13, the float 41 rises. In the storage space 13, the steam is discharged from the steam discharge port 17 as the drain accumulates. When the drain water level in the storage space 13 reaches a predetermined high water level, the valve operating rod 36 is raised by the snap mechanism 50. As a result, the supply valve 20 is opened and the exhaust valve 30 is closed.

  When the air supply valve 20 is opened, the steam (high-pressure steam) in the steam system 1 flows from the steam inlet 16 and is introduced into the upper part of the storage space 13 (the upper space of the drain). Then, the drain accumulated in the storage space 13 is pushed downward by the pressure of the introduced steam and discharged from the drain discharge port 15. That is, the drain of the storage space 13 is pumped. When the drain water level in the storage space 13 decreases due to the drainage, the float 41 descends. When the drain water level in the storage space 13 reaches a predetermined low water level, the valve operating rod 36 is lowered by the snap mechanism 50. As a result, the supply valve 20 is closed and the exhaust valve 30 is opened.

  In the steam system 1 described above, a heating operation by the steam use system 2 and a recovery operation by the drain recovery system 3 are performed. In the steam use system 2, steam with a predetermined temperature is supplied from the supply pipe 2A to the steam using device 2B with the supply valve 2C set to a predetermined opening, and the steam exchanges heat with the object and condenses. The object is heated at a predetermined temperature. On the other hand, in the drain recovery system 3, the drain generated in the steam using device 2 </ b> B flows into the steam trap 4 </ b> C in the recovery pipe 4. Then, by driving the vacuum generation unit 5 (first pump 5D), a predetermined pressure difference is generated between the upstream pressure and the downstream pressure of the steam trap 4C, and the drain flows downstream from the steam trap 4C. Discharged to the side. The discharged drain is sucked and collected by the vacuum generation unit 5 and stored in the drain tank 5A. Further, by driving the second pump 5F, the drain of the drain tank 5A is supplied to the use side by the second pump 5F.

  As described above, according to the drain recovery system 3 of the above-described embodiment, the drain of the drain tank 5A is circulated with the ejector by the first pump 5D, and the suction of the ejector 5C is recovered by the circulation of the drain. Drain is sucked and collected from the tube 4 to the ejector 5C. On the other hand, in the drain recovery system 3, the drain of the drain tank 5A is supplied to the use side by the second pump 5F. In both the first and second pumps 5D and 5F, the drain of the storage space 13 is discharged from the drain discharge port 15 by the pressure of the introduced working gas (steam). That is, the first and second pumps 5D and 5F are configured to perform a drain discharge operation (pump operation) using the pressure (pressure energy) of the working gas as a power source. Therefore, it is possible to suck and collect the drain from the steam using device 2B without using electric power (electric energy) and supply the collected drain to the use side. Therefore, according to the drain collection | recovery system | strain 3 of the said embodiment, the power consumption of the vacuum generation unit 5 can be reduced.

  In the steam system 1 of the above embodiment, the number of steam use systems 2 (steam use equipment 2B) may be two, four or more, or one.

  The technology disclosed in the present application is useful for a drain recovery device that recovers drain generated in a steam-using device.

1 Steam System 2B Steam Use Equipment 3 Drain Recovery System (Drain Recovery Device)
4 Recovery tube 5 Vacuum generation unit (suction mechanism)
5A Drain tank 5C Ejector 5D 1st pump 5F 2nd pump 10 Casing 13 Storage space 14 Drain inlet (inlet)
15 Drain discharge port (discharge port)
16 Steam inlet (Inlet)

Claims (2)

A drain recovery device that is connected to a steam using device for condensing steam via a recovery pipe and has a suction mechanism for recovering drain generated by condensation of the steam in the steam using device,
The suction mechanism is
Drain tank,
An ejector connected to the recovery pipe;
A casing having a drain inlet and outlet and a working gas inlet, and having a drain storage space formed therein, is introduced into the storage space from the inlet and the working gas A first pump and a second pump for discharging the drain of the storage space from the discharge port by pressure;
The drain of the drain tank is circulated with the ejector by the first pump, and the drain is sucked and collected from the recovery pipe to the ejector, while the drain of the drain tank is supplied to the user side by the second pump. A drain collecting device characterized by being configured to do so. In the drain collection device according to claim 1,
The drain recovery device, wherein the recovery pipe is connected to a plurality of the steam-using devices.

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