JP2019039585A - Silencer - Google Patents

Abstract

To suppress occurrence of water hammer.SOLUTION: A silencer 18 comprises: a downstream side mixing part 21 configured to mix low-temperature fluid and upstream side mixed fluid and flow out downstream side mixed fluid; an upstream side mixing part 22 configured to mix the downstream side mixed fluid and high-temperature fluid, and flow out the upstream side mixed fluid toward the downstream side mixing part 21; and a return flow passage 23 configured to flow into the upstream side mixing part 22 the downstream side mixed fluid flown out from the downstream side mixing part 21. The downstream side mixing part 21 is configured to flow out part of the downstream side mixed fluid to the outside.SELECTED DRAWING: Figure 1

Description

  The present application relates to a silencer for contacting a hot fluid with a cold fluid.

  For example, as disclosed in Patent Document 1, a first drain pipe (collection main pipe) through which a low-temperature fluid (low-temperature drain) flows, and a high-temperature fluid (high-temperature drain or re-evaporated steam of high-temperature drain) are passed through the first drain pipe. There is known a drain recovery system including a second drain pipe (a branch recovery pipe) to be discharged. In this system, the high-temperature fluid that flows through the second drain pipe merges with the low-temperature fluid that flows through the first drain pipe and is recovered.

JP 50-55701 A

  By the way, in the system as described above, the high temperature fluid flowing through the second drain pipe may contain re-evaporated vapor. When this re-evaporated vapor flows out to the first drain pipe, the re-evaporated vapor is rapidly condensed, so that an impact or sound is generated. A phenomenon in which a large impact or sound is generated by such rapid condensation of steam is called water hammer.

  The technology disclosed in the present application has been made in view of such circumstances, and an object thereof is to suppress the occurrence of a water hammer.

  The silencer of the present application mixes a low temperature fluid and an upstream mixed fluid, mixes the downstream mixing fluid that flows out the downstream mixed fluid, and mixes the high temperature fluid and the downstream mixed fluid toward the downstream mixing portion. An upstream mixing section that causes the upstream mixed fluid to flow out, and a return flow path section that causes the downstream mixed fluid that has flowed out from the downstream mixing section to flow into the upstream mixing section. Causes a part of the downstream mixed fluid to flow out.

  According to the silencer of this application, generation | occurrence | production of a water hammer can be suppressed.

FIG. 1 is a piping system diagram illustrating a schematic configuration of a drain recovery system according to the first embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the silencer according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a schematic configuration of the silencer according to the second embodiment. FIG. 4 is a cross-sectional view illustrating a schematic configuration of the silencer according to the third embodiment. FIG. 5 is a cross-sectional view taken along line AA in FIG.

  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.

(Embodiment 1)
FIG. 1 is a piping system diagram illustrating a schematic configuration of a drain recovery system 1 according to the first embodiment. As shown in FIG. 1, the drain recovery system 1 of the present embodiment includes a steam pipe 11, a steam using device 13, a first drain pipe 14 through which a low-temperature fluid flows, and a plurality of second drains through which a high-temperature fluid flows. It comprises a tube 16 and a silencer 18 according to the claims of this application. For example, the low-temperature fluid is drain generated in the steam using device 13, and the high-temperature fluid is drain generated in the steam pipe 11 or drain re-evaporated steam.

  The upstream end of the steam pipe 11 is connected to, for example, boiler equipment (not shown), and the downstream end of the steam pipe 11 is connected to the steam using device 13. Steam generated in the boiler facility is supplied to the steam using device 13 through the steam pipe 11. The steam pipe 11 is provided with a pressure reducing valve 12 for adjusting the pressure of the steam. The steam using device 13 is, for example, a heat exchanger, and the steam supplied from the steam pipe 11 dissipates heat to the object and condenses, and the object is heated. Steam condenses into a cryogenic fluid.

  The first drain pipe 14 is connected to the steam using device 13. The low-temperature fluid generated by the condensation of the steam in the steam using device 13 is recovered through the first drain pipe 14. The first drain pipe 14 is provided with a liquid pumping device 15. The liquid pumping device 15 is, for example, a pump that pumps the low-temperature fluid generated in the steam using device 13 to the downstream side through the first drain pipe 14. In the liquid pumping device 15, for example, the low temperature fluid of the steam using device 13 flows in through the first drain pipe 14 and is temporarily stored. When the storage amount of the low-temperature fluid reaches a predetermined amount, the high-pressure working gas is introduced into the liquid pumping device 15, and the stored low-temperature fluid is pumped to the downstream side of the first drain pipe 14 by the pressure of the working gas. When the low-temperature fluid is pumped, the low-temperature fluid again flows from the steam using device 13 into the liquid pumping device 15 and is stored. Thus, in the liquid pumping device 15, the inflow of the low temperature fluid and the pumping (discharge) of the low temperature fluid are alternately performed.

  The plurality of second drain pipes 16 are connected to the steam pipe 11 and the silencer 18. Specifically, the upstream end of the second drain pipe 16 is connected to the steam pipe 11, and the downstream end of the second drain pipe 16 is connected to the silencer 18. The plurality of second drain pipes 16 are provided at intervals (for example, 20 to 30 m). The high-temperature drain generated by the condensation of the steam in the steam pipe 11 is collected in the first drain pipe 14 via the second drain pipe 16 and the silencer 18.

  A steam trap 17 is provided in the middle of the second drain pipe 16. Steam in the steam pipe 11 and high-temperature drain generated in the steam pipe 11 flow into the steam trap 17 through the second drain pipe 16. While the steam trap 17 blocks the passage of steam from the steam pipe 11, only the high-temperature drain that has flowed in automatically flows downstream due to the upstream and downstream pressure difference (difference between the upstream pressure and the downstream pressure). Are exhausted. Thus, the high-temperature drain generated in the steam pipe 11 joins the low-temperature fluid flowing through the first drain pipe 14 via the second drain pipe 16 and the silencer 18 and flows downstream.

<Configuration of silencer>
The silencer 18 is provided at a connection portion with the first drain pipe 14 on the downstream side of the steam trap 17 in the second drain pipe 16. The silencer 18 is for bringing the high temperature fluid into contact with the low temperature fluid.

  FIG. 2 is a cross-sectional view illustrating a schematic configuration of the silencer 18 according to the first embodiment. The silencer 18 includes a downstream mixing unit 21, an upstream mixing unit 22, and a return channel unit 23. For example, the downstream mixing unit 21 is formed by a cross joint, and the upstream mixing unit 22 is formed by a T joint. The return flow path unit 23 returns the downstream mixed fluid from the downstream mixing unit 21 to the upstream mixing unit 22.

  The downstream mixing unit 21 includes an inlet 27 into which a low-temperature fluid flows in, an outlet 28 through which a part of the downstream mixed fluid having a temperature higher than that of the low-temperature fluid flows out, and the remaining downstream mixed fluid as a return channel unit 23. And an inflow port 32 into which an upstream mixed fluid whose temperature is higher than that of the downstream mixed fluid flows. In the direction of the up / down arrow, the upper end of the outflow port 30 is on an extension line extending from the upper end of the inflow port 27 in a direction perpendicular to the up / down arrow. The inflow port 27 is screwed to the first drain pipe 14. The outflow port 28 is screw-coupled to the third drain pipe 24 from which a part of the downstream mixed fluid flows out. The outlet 30 is connected to the upstream end side of the return channel 23 through which the remaining portion of the downstream mixed fluid flows through the different-diameter bushing 42 and the bite joint 43 (in the return channel 23, the downstream side The mixing unit 21 side is the upstream side, and the upstream mixing unit 22 side is the downstream side. The inflow port 32 is screwed to the downstream end side of the supply flow path portion 31 through which the upstream mixed fluid flows. The supply flow path unit 31 supplies the upstream mixed fluid from the upstream mixing unit 22 to the downstream mixing unit 21.

  The upstream mixing unit 22 includes an inlet 33 into which a high-temperature fluid higher in temperature than the upstream mixed fluid flows in via the ejector 25, an inlet 34 into which the downstream mixed fluid flows in, and a flow from which the upstream mixed fluid flows out. And an outlet 35. The inflow port 33 is connected to the second drain pipe 16 via the ejector 25 and the bite joint 26. The inflow port 34 is connected to the downstream end side of the return flow path portion 23 via a different diameter bushing 44 and a bite joint 45. In the direction of the up / down arrow, the lower end of the inflow port 34 is positioned below an extension line extending in a direction perpendicular to the up / down arrow from the lower end surface of the discharge port 372. The outflow port 35 is screwed to the upstream end side of the supply flow path portion 31.

  The ejector 25 is provided inside the upstream mixing unit 22 and includes a nozzle member 36 and a suction member 37. The nozzle member 36 has a head portion 36a and a shaft portion 36b. The head 36a is formed in a flat and substantially hexagonal column shape. The shaft portion 36b is formed continuously on the downstream side of the head portion 36a and extends in the upstream / downstream direction. The shaft portion 36b is formed in a cylindrical shape coaxial with the head portion 36a. A small-diameter male screw is formed on the outer peripheral surface on the downstream side of the shaft portion 36b. The female screw on the upstream end side of the suction member 37 is screw-coupled with the small-diameter male screw of the shaft portion 36b.

  In the head portion 36a and the shaft portion 36b, a through passage through which the high temperature fluid flows is formed in the axial direction. The high-temperature fluid flows from the head portion 36a toward the shaft portion 36b. A large-diameter male screw is formed on the upstream outer peripheral surface of the shaft portion 36b. The large-diameter male screw of the shaft portion 36 b is screwed to the female screw of the inflow port 33.

  The downstream end side of the second drain pipe 16 is connected to the nozzle member 36 via the bite joint 26. In the bite joint 26, a through passage through which a high-temperature fluid flows is formed in the axial direction.

  The nozzle member 36 has a nozzle portion 361 having an inner diameter smaller than that of the other portion on the downstream end side. The nozzle portion 361 causes the high-temperature fluid that has flowed in from the second drain pipe 16 to be injected into the suction member 37. The suction member 37 has a suction port 371 and a discharge port 372. The suction port 371 sucks the downstream mixed fluid from the inlet 34 into the suction member 37 by the jet pump effect of the high-temperature fluid ejected from the nozzle part 361. For example, four suction ports 371 are provided in the suction member 37 at intervals in the circumferential direction around the axis. The discharge port 372 discharges the upstream mixed fluid obtained by mixing the high-temperature fluid and the downstream mixed fluid toward the outlet 35.

  A male screw is formed on the upstream outer peripheral surface of the different-diameter bushing 42 connected to the outlet 30 of the downstream mixing unit 21. The male screw of the different diameter bushing 42 is screwed to the female screw of the outlet 30. A female screw is formed on the inner peripheral surface on the downstream side of the different diameter bushing 42. The female screw of the different diameter bushing 42 is screwed to the male screw on the upstream side of the bite joint 43. The upstream end side of the return flow passage 23 is connected to the downstream side of the bite joint 43. A male screw is formed on the outer peripheral surface on the downstream side of the different diameter bushing 44 connected to the inlet 34 of the upstream mixing unit 22. The male screw of the different diameter bushing 44 is screwed to the female screw of the inlet 34. An internal thread is formed on the inner peripheral surface on the upstream side of the different diameter bushing 44. The female screw of the different-diameter bushing 44 is screwed to the male screw on the downstream side of the bite joint 45. The downstream end side of the return flow path portion 23 is connected to the upstream side of the bite joint 45.

  The operation of the silencer 18 configured as described above will be described. Some of the high-temperature drain discharged from the steam trap 17 may re-evaporate into re-evaporated vapor. This is because the steam and high-temperature drain flowing into the steam trap 17 from the steam pipe 11 are at a high temperature, but the high-temperature drain is discharged from the steam trap 17 and the pressure is lowered. For this reason, re-evaporated steam (high temperature fluid) can flow into the silencer 18.

  In the silencer 18, re-evaporated vapor (high-temperature fluid) that has flowed into the nozzle member 36 from the second drain pipe 16 through the bite joint 38 is injected from the nozzle portion 361 into the suction member 37. The re-evaporated vapor (high-temperature fluid) thus injected is mixed with the downstream mixed fluid sucked from the suction port 371 and condensed, and as an upstream mixed fluid, is supplied to the downstream mixing portion 21 via the supply flow path portion 31. Flows in. In the downstream mixing unit 21, the upstream mixed fluid and the low temperature fluid are further mixed and flow to the outlet 28 or the outlet 30.

  If the re-evaporated steam (hot fluid) and the low-temperature fluid are mixed directly, the temperature difference between the re-evaporated steam (hot fluid) and the low-temperature fluid is large. Hammer can occur.

  In the silencer 18 of the present embodiment, the re-evaporated steam (high temperature fluid) is mixed and condensed with the downstream mixed fluid before the low temperature fluid in the ejector 25, and then becomes the upstream mixed fluid. Mix. In this case, since the temperature difference between the re-evaporated steam (high temperature fluid) and the downstream mixed fluid is small, the impact and sound when the re-evaporated steam (high temperature fluid) condenses can be reduced, and water hammer is generated. Can be suppressed.

  In the silencer 18, the upstream mixed fluid obtained by mixing the high temperature fluid and the downstream mixed fluid is mixed with the low temperature fluid in the downstream mixing unit 21. Since the upstream mixed fluid has a small temperature difference from the low temperature fluid, even if it condenses, the impact and sound are small. For this reason, generation | occurrence | production of a water hammer can be suppressed.

  That is, the high temperature fluid is first mixed with the downstream mixed fluid, and then becomes the upstream mixed fluid and mixed with the low temperature fluid. Thus, the generation of water hammer can be suppressed by mixing in stages.

  In the silencer 18 according to the first embodiment, the upper end of the outlet 30 is on an extended line extending from the upper end of the inlet 27 in a direction perpendicular to the up and down arrows. However, the upper end of the outlet 30 may be positioned below an extension line extending from the upper end of the inlet 27 in the direction perpendicular to the up / down arrow in the direction of the up / down arrow. In this case, since a part of the low temperature fluid collides with the inner wall of the supply flow path portion 31 and is prevented from going straight to the outlet 30 and stays in the vicinity of the downstream mixing portion 21, the low temperature fluid and the upstream mixed fluid are retained. And become easy to mix.

  In the silencer 18 according to the first embodiment, the lower end of the inflow port 34 is located below the extended line extending from the lower end surface of the discharge port 372 in the direction perpendicular to the up and down arrows. However, the lower end of the inflow port 34 may be positioned above the extended line extending in the direction perpendicular to the up / down arrow from the lower end surface of the discharge port 372 in the up / down arrow direction. In this case, since the distance between the inflow port 34 and the suction port 371 is reduced, the downstream mixed fluid that has flowed through the return flow path portion 23 is easily sucked into the suction port 371 from the inflow port 34. In addition, since the distance between the inflow port 34 and the discharge port 372 is increased, the upstream mixed fluid discharged from the discharge port 372 does not easily flow into the return flow path portion 23 from the inflow port 34. Moreover, it is preferable that the lower end of the inflow port 34 is located in the vicinity of the extension line extended in the direction orthogonal to the up-down arrow from the lower end of the suction inlet 371 in the direction of the up-down arrow. In this case, since the distance between the inlet 34 and the suction port 371 is further reduced, the downstream-side mixed fluid that has flowed through the return flow path portion 23 is more easily sucked from the inlet 34 into the suction port 371. Further, since the distance between the inflow port 34 and the discharge port 372 is further increased, the upstream-side mixed fluid discharged from the discharge port 372 becomes more difficult to flow into the return flow path portion 23 from the inflow port 34.

(Embodiment 2)
FIG. 3 is a cross-sectional view illustrating a schematic configuration of the silencer 19 according to the second embodiment. The silencer 19 of the present embodiment is the silencer of the first embodiment, in which an upstream mixing unit, a downstream mixing unit, and a supply flow path unit are integrally formed. In the present embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The silencer 19 includes a downstream mixing unit 51, an upstream mixing unit 52, a return channel unit 23, and a supply channel unit 53.

  The downstream mixing unit 51 includes an inlet 54 through which a low-temperature fluid flows in, an outlet 55 through which a part of the downstream mixed fluid flows out, and an outlet 56 through which the remainder of the downstream mixed fluid flows out to the return channel unit 23. And have. In the direction of the up / down arrow, the upper end of the outflow port 56 is on an extension line extending from the upper end of the inflow port 54 in a direction perpendicular to the up / down arrow. The upstream mixing unit 52 includes an inlet 58 through which high-temperature fluid flows in via the ejector 25 and an inlet 59 through which the downstream mixed fluid flows in. In the direction of the up / down arrow, the lower end of the inflow port 59 is located below the extended line extending from the lower end surface of the discharge port 372 in the direction perpendicular to the up / down arrow. The supply flow path unit 53 supplies the upstream mixed fluid from the upstream mixing unit 52 to the downstream mixing unit 51.

  In the silencer 19 of the present embodiment, the upstream mixing unit 51, the downstream mixing unit 52, and the supply flow path unit 53 are integrally formed, so that the number of parts can be reduced.

  In the silencer 19 according to the second embodiment, the upper end of the outflow port 56 is on an extended line extending from the upper end of the inflow port 54 in a direction perpendicular to the up and down arrows. However, the upper end of the outflow port 56 may be positioned below the extended line extending in the direction perpendicular to the up / down arrow from the upper end of the inflow port 54 in the direction of the up / down arrow. In this case, since a part of the low temperature fluid collides with the inner wall of the supply flow path portion 53 and is prevented from going straight to the outflow port 56 and stays in the vicinity of the downstream side mixing portion 51, the low temperature fluid and the upstream side mixed fluid are retained. And become easy to mix.

  In the silencer 19 according to the second embodiment, the lower end of the inflow port 59 is positioned below the extended line extending in the direction perpendicular to the up and down arrows from the lower end surface of the discharge port 372. However, the lower end of the inflow port 59 may be positioned above the extension line extending in the direction perpendicular to the up / down arrow from the lower end of the discharge port 372 in the direction of the up / down arrow. In this case, since the distance between the inflow port 59 and the suction port 371 becomes short, the downstream mixed fluid that has flowed through the return flow path portion 23 is easily sucked into the suction port 371 from the inflow port 59. Further, since the distance between the inflow port 59 and the discharge port 372 is increased, the upstream mixed fluid discharged from the discharge port 372 does not easily flow into the return flow path portion 23 from the inflow port 59. Moreover, it is preferable that the lower end of the inflow port 59 is located in the vicinity of the extension line extended in the direction orthogonal to the up-down arrow from the lower end of the suction inlet 371 in the direction of the up-down arrow. In this case, since the distance between the inflow port 59 and the suction port 371 is further reduced, the downstream-side mixed fluid that has flowed through the return flow path portion 23 is more likely to be sucked into the suction port 371 from the inflow port 59. Further, since the distance between the inflow port 59 and the discharge port 372 is further increased, the upstream mixed fluid discharged from the discharge port 372 is more difficult to flow into the return flow path portion 23 from the inflow port 59.

(Embodiment 3)
FIG. 4 is a cross-sectional view illustrating a schematic configuration of the silencer 61 according to the third embodiment. FIG. 5 is a cross-sectional view taken along line AA in FIG. The silencer 61 of the present embodiment is the silencer of the second embodiment in which an upstream mixing unit, a downstream mixing unit, a supply flow channel unit, and a return flow channel unit are integrally formed. In the present embodiment, the same members as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The silencer 61 includes a downstream side mixing unit 62, an upstream side mixing unit 63, a return channel unit 64, and a supply channel unit 65. The return flow path portion 64 extends from the upstream mixing portion 63 to the downstream mixing portion 62 and is formed in a substantially cylindrical shape as shown in FIG. The supply flow path portion 65 extends from the upstream mixing portion 63 to the downstream mixing portion 62, and is formed in a substantially cylindrical shape as shown in FIG. The supply flow path portion 65 is formed with a larger diameter than the return flow path portion 64. A partition wall member 66 extending in a direction parallel to the up and down arrows is provided between the return flow path portion 64 and the supply flow path portion 65. The partition member 66 partitions the return flow path portion 64 and the supply flow path portion 65. In the direction of the up / down arrow, the upper end of the partition wall member 66 is located above the extended line extending in the direction orthogonal to the up / down arrow from the lower end surface of the discharge port 372 and is orthogonal to the up / down arrow from the lower end of the suction port 371. It is located below the extended line extending to. Further, in the direction of the up / down arrow, the lower end of the partition wall member 66 is positioned below the extension line extending in the direction perpendicular to the up / down arrow from the upper end of the inflow port 67, and is orthogonal to the up / down arrow from the axial center of the inflow port 67. It is on the extended line that extends in the direction of.

  The downstream mixing unit 62 includes an inlet 67 through which a low-temperature fluid flows, an outlet 68 through which a part of the downstream mixed fluid flows out, and an outlet 69 through which the remainder of the downstream mixed fluid flows out to the return channel unit 64. And have. The outlet 69 is formed below the lower end of the partition wall member 66 in the direction of the up and down arrows. The upstream side mixing unit 63 includes an inlet 71 through which high-temperature fluid flows in via the ejector 25 and an inlet 72 through which the downstream mixed fluid flows. The inflow port 72 is formed above the upper end of the partition wall member 66 in the direction of the up and down arrows. The supply flow path unit 65 supplies the upstream mixed fluid from the upstream mixing unit 63 to the downstream mixing unit 62.

  In the silencer 61 of the present embodiment, the lower end of the inflow port 72 is located above the extended line extending in the direction perpendicular to the up / down arrow from the lower end surface of the discharge port 372 in the up / down arrow direction. In this case, since the distance between the inflow port 72 and the suction port 371 is reduced, the downstream mixed fluid that has flowed through the return flow path portion 64 is easily sucked into the suction port 371 from the inflow port 72. Further, since the distance between the inlet 72 and the discharge port 372 is increased, the upstream mixed fluid discharged from the discharge port 372 does not easily flow into the return flow path portion 64 from the inlet 72. Moreover, it is preferable that the lower end of the inflow port 72 is located in the vicinity of the extension line extended in the direction orthogonal to the up-down arrow from the lower end of the suction inlet 371 in the direction of the up-down arrow. In this case, since the distance between the inflow port 72 and the suction port 371 is further reduced, the downstream mixed fluid that has flowed through the return flow path portion 64 is more easily sucked into the suction port 371 from the inflow port 72. In addition, since the distance between the inflow port 72 and the discharge port 372 is further increased, the upstream mixed fluid discharged from the discharge port 372 is more difficult to flow into the return flow path portion 64 from the inflow port 72.

  Moreover, in the silencer 61 of this embodiment, the upper end of the outflow port 69 is located below the extended line extending in the direction perpendicular to the up / down arrow from the upper end of the inflow port 67 in the direction of the up / down arrow. It is on an extension line extending from the axis center of 67 in a direction perpendicular to the up and down arrows. In this case, since a part of the low temperature fluid collides with the partition wall member 66 and is prevented from going straight to the outlet 56 and stays in the vicinity of the downstream side mixing portion 62, the low temperature fluid and the upstream side mixed fluid are mixed. It becomes easy.

  As described above, the silencer 18, 19, or 61 of the above embodiment mixes the low-temperature fluid and the upstream mixed fluid and flows the downstream mixed fluid out, and the high-temperature fluid. Outflow from the downstream mixing unit 21, 51, or 62, and the upstream mixing unit 22, 52, or 63 that mixes the downstream mixed fluid and flows the downstream mixed fluid out toward the downstream mixing unit 21, 51, or 62. And a return flow path section 23 or 64 for allowing the downstream mixed fluid to flow into the upstream mixing section 22 or 52 or 63. The downstream mixing section 21 or 51 or 62 sends a part of the downstream mixed fluid to the outside. Spill.

  According to the above configuration, the high-temperature fluid is mixed with the downstream mixed fluid prior to the low-temperature fluid in the upstream mixing unit 22, 52, or 63 and condensed, and then becomes the upstream mixed fluid. In the mixing unit 21, 51, or 62, the upstream mixed fluid is mixed with the low temperature fluid. In this case, since the temperature difference between the high temperature fluid and the downstream mixed fluid is small, the impact and sound when the high temperature fluid condenses can be reduced. Further, since the temperature difference between the upstream mixed fluid and the low temperature fluid is small, it is possible to reduce the impact and sound when the re-evaporated vapor of the upstream mixed fluid is condensed. That is, the high temperature fluid is first mixed with the downstream mixed fluid, and then becomes the upstream mixed fluid and mixed with the low temperature fluid. Thus, the generation of water hammer can be suppressed by mixing fluids with reduced temperature differences step by step.

  Further, in the silencer 18, 19, or 61 of the above embodiment, the high-temperature fluid is drain or drain re-vaporized steam.

  Hot fluids tend to condense rapidly when mixed directly with cold fluids. According to said structure, a high temperature fluid mixes with a low temperature fluid as an upstream mixed fluid, after mixing with a downstream mixed fluid. Thus, it is particularly effective to mix the high temperature fluid with the low temperature fluid stepwise.

  In the silencer 18, 19, or 61 of the above embodiment, the upstream side mixing unit 22, 52, or 63 includes the ejector 25, and the ejector 25 is driven by a high-temperature fluid and sucks the downstream side mixed fluid. .

  According to the above configuration, since the ejector 25 sucks the downstream mixed fluid using the jet pump effect of the high temperature fluid, the high temperature fluid and the downstream mixed fluid are easily mixed. As a result, the condensing action of the high-temperature fluid can be promoted.

  In the silencer 18, 19, or 61 of the above embodiment, the lower end of the inflow port 34, 59, or 72 into which the downstream mixed fluid flows is located above the extension line of the lower end of the discharge port 372 of the ejector 25. It is.

  According to the above configuration, since the distance between the inlet 34 or 59 or 72 and the suction port 371 is reduced, the downstream-side mixed fluid that has flowed through the return flow path 23 or 64 flows into the inlet 34 or 59 or 72. It becomes easy to be sucked into the suction port 371. Further, since the distance between the inflow port 34 or 59 or 72 and the discharge port 372 is increased, the upstream mixed fluid discharged from the discharge port 372 flows into the return flow path section 23 or 64 from the inflow port 34 or 59 or 72. It becomes difficult to do.

  Further, in the silencer 18, 19, or 61 of the above embodiment, the upper end of the outlet 30, 56, or 69 from which the downstream mixed fluid flows out to the return flow path 23 or 64 is the inlet 27 or 54 into which the low-temperature fluid flows. Or it is located below the extended line at the upper end of 67.

  According to the above configuration, a part of the cryogenic fluid collides with the inner wall of the supply flow path section 31 or 53 or the partition wall member 66 and is prevented from going straight to the outlet 30, 56 or 69, so that the downstream mixing section Since it stays in the vicinity of 21, 51, or 62, it becomes easy to mix the low temperature fluid and the upstream mixed fluid.

(Other embodiments)
The technology disclosed in the present application may be configured as follows in the above embodiment. For example, in the first embodiment, the supply flow path unit 31 is formed integrally with the downstream mixing unit 21 and connected to the upstream mixing unit 22, or formed integrally with the upstream mixing unit 22 to form the downstream mixing unit. 21 may be connected.

  The technique disclosed in this application is useful for a silencer that brings a hot fluid into contact with a cold fluid.

18, 19, 61 Silencer 21, 51, 62 Downstream mixing unit 22, 52, 63 Upstream mixing unit 23, 64 Return flow path unit 25 Ejectors 27, 54, 67 Inlet ports 30, 56, 69 into which a low-temperature fluid flows Outflow ports 34, 59, 72 through which the downstream mixed fluid flows out to the return flow path section Inlet 371 through which the downstream mixed fluid flows in Ejector suction port 372 Ejector discharge port

Claims (5)

A downstream mixing unit that mixes the low-temperature fluid and the upstream mixed fluid and causes the downstream mixed fluid to flow out; and
An upstream mixing section that mixes a high-temperature fluid and the downstream mixed fluid, and causes the upstream mixed fluid to flow toward the downstream mixing section;
A return flow path section for allowing the downstream mixed fluid flowing out from the downstream mixing section to flow into the upstream mixing section,
The silencer according to claim 1, wherein the downstream mixing unit causes part of the downstream mixed fluid to flow out. The silencer according to claim 1, wherein
The silencer, wherein the high-temperature fluid is drain or re-evaporated vapor of the drain. The silencer according to claim 1 or 2,
The upstream mixing unit includes an ejector,
The silencer is driven by the high-temperature fluid and sucks the downstream mixed fluid. The silencer according to claim 3, wherein
The silencer according to claim 1, wherein a lower end of an inflow port into which the downstream mixed fluid flows is located above an extension line of a lower end surface of the discharge port of the ejector. The silencer according to claims 1 to 4,
The silencer, wherein an upper end of an outlet from which the downstream mixed fluid flows out to the return flow path portion is located below an extension line of an upper end of the inlet into which the low-temperature fluid flows.

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