JP2017032110A - Steam system - Google Patents

Abstract

[Problem] To provide a steam system capable of continuously sending condensate to a downstream system even while a steam trap in which an abnormality has occurred is being inspected and repaired. [Solution] A steam system 1 includes a heat exchanger 21, a parallel connection section 22, and two three-way valves 23, 26. In the heat exchanger 21, steam dissipates heat to an object and condenses. The parallel connection section 22 is provided downstream of the heat exchanger 21, and two steam traps 24, 25 that discharge only condensate are connected in parallel to each other. The two three-way valves 23, 26 are provided on the inlet and outlet sides of the parallel connection section 22, and switch the flow path of the condensate generated by the condensation of steam in the heat exchanger 21 between a state in which it flows through one of the two steam traps 24, 25 and a state in which it flows through the other. [Selected Figure] Figure 1

Description

  The present application relates to a steam system having a steam trap.

  For example, as disclosed in Patent Document 1, a steam system (steam heating device) that heats an object with steam is known. This steam system includes a heat exchanger for exchanging heat between the steam and an object, and a steam trap provided downstream of the heat exchanger. In this steam system, steam flowing in the heat exchanger dissipates heat to the object and condenses to become drain (condensate). Thereby, a target object is heated (latent heat heating). And the drain which generate | occur | produced with the heat exchanger is discharged | emitted automatically downstream via a steam trap. The discharged drain is sent to a system at the use destination, for example.

JP 2013-169477 A

  By the way, in the steam system as described above, when an abnormality such as inability to drain drain occurs due to steam leakage or clogging in the steam trap, the operation of the downstream system (drain usage destination) may have to be temporarily stopped. . That is, when an abnormality occurs in the steam trap, the drain cannot be sent to the downstream system while the steam trap is inspected and repaired, and thus the operation of the system may not be continued.

  The technology disclosed in the present application has been made in view of such circumstances, and its purpose is to continuously send the drain to the downstream system even during inspection and repair of the steam trap in which an abnormality has occurred. It is to provide a possible steam system.

  In order to achieve the above object, the technology disclosed in the present application is configured so that two steam traps are connected in parallel to each other, and drain generated in the steam use section can be selected and flowed to either of the two steam traps. The flow path was switched.

  Specifically, the steam system of the present application includes a steam using part, a parallel connection part, and two three-way valves. The steam use part is a part where the steam dissipates heat to the object and condenses. The parallel connection part is provided downstream of the steam use part, and two steam traps that discharge only the drain are connected in parallel to each other. The two three-way valves are provided on the inlet side and the outlet side of the parallel connection part, and the drain generated by the condensation of the steam in the steam use part flows through one of the two steam traps and the other. The flow path is switched to the state to be performed.

  As described above, according to the steam system of the present application, the two steam traps are connected in parallel to each other, and the state where the drain from the steam use part circulates one steam trap and the other steam trap circulates. Two three-way valves for switching the flow path were provided. Therefore, for example, when an abnormality occurs in the steam trap in which drain is circulating, the drain from the steam using part is allowed to flow to the other (no abnormality) steam trap by switching the flow path using two three-way valves. Can do. Accordingly, even while the steam trap in which an abnormality has occurred is being inspected and repaired, the drain generated in the steam use section can be continuously sent to the downstream system. As a result, the downstream system can be continuously operated without being temporarily stopped.

FIG. 1 is a circuit diagram illustrating a schematic configuration of a steam system according to an 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.

  The steam system 1 of the present embodiment heats an object (for example, a reaction kettle) with steam (saturated steam). As shown in FIG. 1, the steam system 1 includes a steam circuit 10 through which steam flows. The steam circuit 10 includes a heat exchanger 21, a parallel connection portion 22, and two three-way valves 23 and 26 (also referred to as three-way switching valves).

  The heat exchanger 21 has a supply rod 11 connected to the inlet side and an outflow pipe 12 connected to the outlet side. The supply tank 11 is connected to a steam generation unit (not shown) that generates water (saturated steam) by heating water.

  In the heat exchanger 21, the steam supplied from the steam generator via the supply rod 11 dissipates heat to the object and condenses, and the object is heated. The steam becomes drain (condensate) by condensing. In other words, the heat exchanger 21 is a latent heat exchanger that heats an object by latent heat of condensation of the steam (latent heat heating), and constitutes a steam using unit according to the claims of the present application.

  The parallel connection part 22 is provided downstream of the heat exchanger 21, and two steam traps 24 and 25 (a first steam trap 24 and a second steam trap 25) are connected in parallel to each other. Specifically, the parallel connection portion 22 includes a first system in which the inflow pipe 13, the first steam trap 24, and the outflow pipe 15 are connected in order, and the inflow pipe 14, the second steam trap 25, and the outflow pipe 16 are connected in order. And a second system. The first system and the second system are connected in parallel. The steam traps 24 and 25 are configured to receive drain (condensate) or steam-mixed drain (condensate) generated by condensation of steam in the heat exchanger 21 and automatically discharge only the drain to the downstream side. .

  Three-way valves 23 and 26 (an inlet-side three-way valve 23 and an outlet side) are respectively provided on the inlet side (that is, one end of the inflow pipes 13 and 14) and the outlet side (that is, one end of the outflow pipes 15 and 16) of the parallel connection portion 22. A three-way valve 26) is provided. In other words, the parallel connection portion 22 has an inlet side connected to the outflow pipe 12 via the inlet side three-way valve 23 and an outlet side connected to the recovery pipe 17 via the outlet side three-way valve 26. In the recovery pipe 17, the drain that has circulated through the parallel connection portion 22 is sent to the drain recovery system.

  The inlet-side three-way valve 23 and the outlet-side three-way valve 26 are electrically operated to switch the flow path between a state where the drain generated in the heat exchanger 21 flows through one of the two steam traps 24 and 25 and a state where the other flows through the other. This is a flow path switching valve. Specifically, in the inlet side three-way valve 23, the first port P1 is connected to the outflow pipe 12, the second port P2 is connected to the inflow pipe 13 on the first steam trap 24 side, and the third port P3 is connected to the second steam. It is connected to the inflow pipe 14 on the trap 25 side. The inlet-side three-way valve 23 has a first state in which the first port P1 and the second port P2 communicate with each other (a state indicated by a solid line in FIG. 1), and a second state in which the first port P1 and the third port P3 communicate with each other. It is configured to switch to (a state indicated by a broken line in FIG. 1). In the outlet side three-way valve 26, the first port P1 is connected to the recovery pipe 17, the second port P2 is connected to the outflow pipe 15 on the first steam trap 24 side, and the third port P3 is connected to the second steam trap 25 side. An outflow pipe 16 is connected. The outlet-side three-way valve 26 has a first state in which the first port P1 and the second port P2 communicate with each other (a state indicated by a solid line in FIG. 1), and a second state in which the first port P1 and the third port P3 communicate with each other. It is configured to switch to (a state indicated by a broken line in FIG. 1).

  In the parallel connection part 22, the inlet-side three-way valve 23 and the outlet-side three-way valve 26 are both switched to the first state, so that the drain generated in the heat exchanger 21 flows through the first steam trap 24. Further, in the parallel connection part 22, the inlet side three-way valve 23 and the outlet side three-way valve 26 are both switched to the second state, so that the drain generated in the heat exchanger 21 flows through the second steam trap 25. . As described above, in the steam system 1, the drain generated in the heat exchanger 21 can be selected and flowed to one of the two steam traps 24 and 25.

  Furthermore, the steam system 1 of the present embodiment includes a control unit 30 and two sensors 31 and 32. The two sensors 31 and 32 are provided in the two steam traps 24 and 25, respectively, and detect an abnormality in the steam traps 24 and 25. Here, the abnormalities of the steam traps 24 and 25 are, for example, a state of steam leakage in which steam is discharged downstream, or a state in which drain cannot be discharged due to clogging of the discharge port (not shown) with foreign matter or the like. It is. When the sensors 31 and 32 detect an abnormality in the steam traps 24 and 25 in which the drain generated in the heat exchanger 21 is circulated, the control unit 30 detects that the drain generated in the heat exchanger 21 is the other (no abnormality). The inlet side three-way valve 23 and the outlet side three-way valve 26 are driven so as to flow through the steam traps 24, 25, and the flow path is switched.

  For example, when both the inlet-side three-way valve 23 and the outlet-side three-way valve 26 are switched to the first state and drain generated in the heat exchanger 21 is flowing through the first steam trap 24, the first steam trap 24 When an abnormality occurs, the control unit 30 switches both the inlet side three-way valve 23 and the outlet side three-way valve 26 to the second state. Thereby, the drain generated in the heat exchanger 21 flows through the second steam trap 25 and is sent to the drain recovery system.

  As described above, according to the steam system 1 of the above embodiment, the two steam traps 24 and 25 are connected in parallel to each other, and the drain from the heat exchanger 21 flows through the one steam trap 24 and 25. Two three-way valves 23 and 26 for switching the flow path to a state in which the other steam traps 24 and 25 are circulated are provided. Therefore, for example, when an abnormality occurs in the steam traps 24 and 25 in which the drain is circulating, the flow from the heat exchanger 21 is switched to the other (the one with no abnormality) by switching the flow path by the two three-way valves 23 and 26. ) Steam traps 24 and 25. Therefore, even while the steam traps 24 and 25 in which an abnormality has occurred are being inspected and repaired, the drain generated in the heat exchanger 21 can be continuously sent to the drain recovery system on the downstream side. As a result, the downstream system can be continuously operated without being temporarily stopped.

  Moreover, in the steam system 1 of the said embodiment, when the abnormality of the steam traps 24 and 25 in which the drain generated in the heat exchanger 21 is circulating is detected, the drain generated in the heat exchanger 21 is the other (the abnormal The control unit 30 is provided to drive the two three-way valves 23 and 26 so as to flow through the steam traps 24 and 25 of the other side, and to switch the flow path. Therefore, the flow path in the parallel connection part 22 can be switched automatically.

  In the steam system 1 of the above embodiment, the two three-way valves 23 and 26 may be manually operated instead of electric. In that case, the control unit 30 is omitted.

  In the steam system 1 of the above embodiment, the sensors 31 and 32 are provided in the steam traps 24 and 25. However, the sensors 31 and 32 are provided in any place as long as the abnormality of the steam traps 24 and 25 can be detected. May be.

  Moreover, in the steam system 1 of the said embodiment, although the case where a vapor | steam using part was the heat exchanger 21 was demonstrated, the vapor | steam using part which concerns on the claim of this application is what heat | fever radiates and condenses to a target object. Anything can be used. For example, the steam use part may be one that heat-sterilizes an empty bottle or the like with steam, or one that wraps a steam pipe around the oil transport pipe and heats and keeps the oil heated with steam.

  The technique disclosed herein is useful for steam systems having a steam trap.

1 Steam System 21 Heat Exchanger (Steam Use Section)
22 Parallel connection 23 Inlet side three-way valve (three-way valve)
24 First Steam Trap (Steam Trap)
25 Second Steam Trap (Steam Trap)
26 Outlet side three-way valve (three-way valve)
30 Control unit 31 Sensor 32 Sensor

Claims (2)

A steam using section where steam dissipates heat to the object and condenses;
A parallel connection part provided downstream of the steam use part, in which two steam traps that discharge only drain are connected in parallel;
Provided on the inlet side and outlet side of the parallel connection part, the drain generated by the condensation of the steam in the steam use part passes through the flow path in a state where one of the two steam traps flows and a state where the other flows. A steam system comprising two three-way valves for switching. The steam system according to claim 1,
Two sensors for detecting abnormalities in the two steam traps,
When the sensor detects an abnormality of the steam trap in which the drain generated in the steam using part is circulating, the two three-way so that the drain generated in the steam using part flows in the other steam trap. A steam system comprising: a controller that drives a valve to switch a flow path.

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