WO2016052726A1

WO2016052726A1 - Drain recovery device

Info

Publication number: WO2016052726A1
Application number: PCT/JP2015/078049
Authority: WO
Inventors: 湯本秀昭
Original assignee: 株式会社テイエルブイ
Priority date: 2014-10-02
Filing date: 2015-10-02
Publication date: 2016-04-07
Also published as: JPWO2016052726A1; JP6554107B2

Abstract

A drain recovery system (10) (drain recovery device) which comprises: a drain flow down pipe (11) which is connected to a steam-using apparatus (4) connected to a supply pipe (3) for steam and down which drain generated by condensation of steam by the steam-using apparatus (4) naturally flows; a drain tank (12) which is connected to the drain flow down pipe (11) and into which the drain flows; a pressure-equalising pipe (13), one end of which communicates with a gas layer of the drain tank (12), and the other end of which is connected to the supply pipe (3); and a check valve (14) which is provided to the pressure-equalising pipe (13) and only allows the steam to flow from the drain tank (12) towards the supply pipe (3).

Description

Drain collection device

The technology disclosed herein relates to a drain recovery device that recovers a natural drain of drain generated by gas condensation in a heat exchanger.

For example, as disclosed in Patent Document 1, a drain recovery device (drain treatment device) is known in which a drain (condensed water) generated by condensation of gas in a heat exchanger is allowed to flow down and recovered. The drain recovery device includes a drain tank connected to the heat exchanger via a drain downflow pipe, and a pressure equalizing pipe (balance pipe) connected to the drain tank and the drain downflow pipe. In this drain recovery device, the drain generated in the heat exchanger flows down to the drain tank through the drain flow pipe and is recovered. At that time, since the pressure in the drain tank and the pressure in the heat exchanger are equalized (balanced) by the pressure equalizing pipe, the drain can flow smoothly from the heat exchanger to the drain tank.

JP 2010-203654 A

By the way, in the drain recovery apparatus of Patent Document 1 described above, one end side of the pressure equalizing pipe (balance pipe) is inserted into the drain flow down pipe and connected so as to open into the heat exchanger. For this reason, the connection configuration of the pressure equalizing pipe is complicated, and there is a possibility that a reverse flow phenomenon occurs in which the drain of the heat exchanger flows down to the drain tank through the pressure equalizing pipe.

The technology disclosed herein has been made in view of such circumstances, and its purpose is to equalize the heat exchanger and the drain tank with a simple configuration and to prevent backflow between the two. It is providing the drain collection | recovery apparatus provided with.

The drain recovery device disclosed herein includes a drain down pipe, a drain tank, a pressure equalizing pipe, and a check valve. The drain flow down pipe is connected to a heat exchanger to which a gas supply rod is connected, and the drain generated by the condensation of the gas in the heat exchanger naturally flows down. The drain tank is connected to the drain downflow pipe, and the drain flows into the drain tank. The pressure equalizing pipe has one end communicating with the gas layer of the drain tank and the other end connected to the supply tank. The check valve is provided in the pressure equalizing pipe and allows only a flow from the drain tank to the supply tank.

According to the drain recovery device disclosed herein, the pressure equalizing pipe is connected to the drain tank (drain tank gas layer) and the heat exchanger supply tank, so the inlet pressure of the heat exchanger and the pressure of the drain tank Can be equalized (balanced). Further, according to the drain recovery device, the pressure equalizing pipe is provided with the check valve that allows only the flow from the drain tank to the supply tank of the heat exchanger. Therefore, it is possible to prevent the gas from flowing backward from the supply tank of the heat exchanger to the drain tank. As described above, according to the drain recovery device disclosed herein, the drain having the pressure equalizing pipe capable of equalizing the heat exchanger and the drain tank with a simple configuration and preventing the backflow from the heat exchanger to the drain tank. A recovery device can be provided. Thereby, the drain can be reliably and smoothly allowed to flow from the heat exchanger to the drain tank via the drain flow pipe.

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

Hereinafter, embodiments will be described with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

This embodiment is a steam system 1 that uses steam as a gas (gas). As shown in FIG. 1, the steam system 1 includes a steam use system 2 and a drain recovery system 10. The drain collection system 10 constitutes a drain collection device.

The steam use system 2 includes a steam use device 4. In the steam using device 4, the steam dissipates heat to the object (in this embodiment, water) and condenses, and the object is heated. Specifically, the steam using device 4 is a so-called shell-type heat exchanger, and an internal flow path 4b is formed in the internal space 4a. A steam supply basket 3, a water inflow pipe 5 and an outflow pipe 6 are connected to the steam using device 4. The supply rod 3 is connected to, for example, a boiler (not shown), and the steam generated by the boiler is supplied to the internal space 4 a of the steam using device 4. The supply rod 3 is provided with a supply valve 7 for adjusting the flow rate of the steam. The inflow pipe 5 and the outflow pipe 6 are connected to both ends of the internal flow path 4b of the heat exchanger 3, and water flows in the order of the inflow pipe 5, the internal flow path 4b, and the outflow pipe 6.

In the steam using device 4, water is heated by the steam flowing into the internal space 4 a from the supply basket 3 radiating heat to the water in the internal flow path 4 b. Steam condenses by releasing heat to water and becomes drain (condensed water). That is, in the steam using device 4, water is heated (latent heat heating) by the latent heat of condensation of the steam.

The drain recovery system 10 includes a drain flow down pipe 11, a drain tank 12, and a pressure equalizing pipe 13 (balance pipe), and flows down the drain (condensed water) generated by the condensation of the steam in the steam using device 4 (natural water). And then collected.

The drain flow down pipe 11 is connected to the steam using device 4 and the drain tank 12, and causes the drain generated in the steam using device 4 to flow down to the drain tank 12 (natural flow). Specifically, one end (inflow end) of the drain flow down pipe 11 is connected to the lower part of the steam using device 4 and communicates with the internal space 4a, and the other end (outflow end) is connected to the drain tank 12 to connect the gas layer ( Communicated with the air layer. The drain tank 12 is a hermetically sealed container, and the drain flows from the drain flow down pipe 11 and is stored. As a matter of course, the drain tank 12 is provided at a position below the steam using device 4.

The pressure equalizing pipe 13 is connected to the drain tank 12 and the supply tank 3 of the steam using device 4, and equalizes (balances) the pressure between the steam using device 4 and the drain tank 12. Specifically, one end (inflow end) of the pressure equalizing pipe 13 is connected to the drain tank 12 and communicates with the gas layer (gas layer), and the other end (outflow end) is on the downstream side of the supply valve 7 in the supply rod 3. It is connected.

Further, a discharge pipe 15 is connected to the lower part of the drain tank 12, and a pump 16 is provided in the discharge pipe 15. In the drain recovery system 10, when a predetermined amount of drain is accumulated in the drain tank 12, the drain is discharged from the drain tank 12 to the discharge pipe 15 by the pump 16. Although not shown, the drain discharged to the discharge pipe 15 is supplied to, for example, a boiler water supply tank.

Furthermore, the drain recovery system 10 of the present embodiment includes a check valve 14 in the pressure equalizing pipe 13. The check valve 14 is provided in the middle of the pressure equalizing pipe 13 and allows only a gas flow from the drain tank 12 toward the supply tank 3.

<Drain collection operation>
A drain collecting operation by the drain collecting system 10 will be described. In the steam using device 4, the steam supplied from the supply basket 3 dissipates heat (condenses) by radiating heat to the water in the internal flow path 4b. The drain of the steam using device 4 flows down the drain flow down pipe 11 and flows into the drain tank 12. On the other hand, the pressure in the drain tank 12 and the supply tank 3 of the steam using device 4 is equalized (balanced) by the pressure equalizing pipe 13, so that the vapor (gas) that is the gas phase of the drain tank 12 passes through the pressure equalizing pipe 13. It flows into the supply bowl 3. In other words, in the drain tank 12, gas-liquid replacement is performed in which the liquid phase drain flows in and the gas phase (vapor phase) vapor flows out. In this way, the draining of the drain from the steam using device 4 to the drain tank 12 is performed smoothly.

The pressure state when the above-described gas-liquid replacement is performed is as follows. Under normal conditions, the pressure in the drain tank 12 (hereinafter referred to as tank pressure P2) is lower than the pressure in the internal space 4a of the steam-using equipment 4 (hereinafter referred to as equipment pressure P1) due to pressure loss in the drain flow down pipe 11. Become. Further, the pressure of the supply rod 3 is equivalent to the equipment pressure P1. In this state, the drain of the steam using device 4 flows down the drain flow down pipe 11 and flows into the drain tank 12 due to the pressure gradient (pressure difference P1-P2) and the water head pressure. The water head pressure is the water head pressure from the drain water level in the internal space 4 a of the steam-using device 4 to the opening position of the drain flow down pipe 11 in the drain tank 12. At this time, since the check valve 14 is provided in the pressure equalizing pipe 13, it is possible to prevent the steam in the supply tank 3 from flowing into the drain tank 12 through the pressure equalizing pipe 13.

Here, depending on the load factor of the steam using device 4 (that is, the steam supply flow rate from the supply tank 3), the device pressure P1 may be lower than the tank pressure P2. That is, when the load of the steam using device 4 is reduced, the opening of the supply valve 7 is reduced, and the steam supply flow rate to the steam using device 4 is decreased. Normally, the equipment pressure P1 decreases due to the condensation of the steam, but recovers because the steam supply flow rate to the steam using equipment 4 is large (recovers to the original pressure). On the other hand, when the load of the steam using device 4 is reduced, the steam supply flow rate to the steam using device 4 is small, so that the device pressure P1 reduced by the condensation of the steam does not recover and falls below the tank pressure P2. In this case, the check valve 14 is opened, and the equipment pressure P1 and the tank pressure P2 are equalized (balanced) by the pressure equalizing pipe 13. Then, the drain of the steam using device 4 flows into the drain tank 12 through the drain downflow pipe 11 due to the water head pressure. In this way, even when the load of the steam using device 4 is reduced, the drain of the drain from the steam using device 4 to the drain tank 12 is smoothly performed.

As described above, according to the drain recovery system 10 of the above embodiment, since the pressure equalizing pipe 13 is connected to the drain tank 12 (the gas layer of the drain tank 12) and the supply rod 3 of the steam using device 4, the steam using device 4 The inlet pressure P1 and the tank pressure P3 can be equalized (balanced). Therefore, gas-liquid replacement can be performed smoothly in the drain tank 12. Therefore, the drainage of the drain from the steam using device 4 to the drain tank 12 can be performed smoothly.

Further, according to the drain recovery system 10 of the above embodiment, the check valve 14 that allows only the flow of steam (gas) from the drain tank 12 toward the supply rod 3 of the steam-using device 4 is provided in the pressure equalizing pipe 13. did. Thereby, it is possible to prevent the steam from flowing backward from the supply tank 3 to the drain tank 12. Therefore, it is possible to prevent the flow of the drain from the steam using device 4 to the drain tank 12 from being hindered by the reverse flow of the steam from the supply rod 3 to the drain tank 12.

As described above, according to the above embodiment, the steam using device 4 (supply rod 3) and the drain tank 12 are pressure-equalized with a simple configuration, and the steam from the steam using device 4 (supply rod 3) to the drain tank 12 is provided. Thus, the drain recovery system 10 including the pressure equalizing pipe 13 that can prevent the backflow is provided. Thereby, the drain can be reliably and smoothly allowed to flow from the steam using device 4 to the drain tank 12 through the drain flow pipe 11.

In addition, although the heat exchanger of the said embodiment demonstrated what condensed a vapor | steam, what kind of thing may be sufficient as a heat exchanger as long as gas (gas) condenses and a drain generate | occur | produces.

The technology disclosed herein is useful for a drain recovery device that recovers the natural drainage of the drain generated in the heat exchanger.

1 Steam system 3 Supply rod 4 Steam use equipment (heat exchanger)
10 Drain collection system (drain collection device)
11 Drain flow down pipe 12 Drain tank 13 Pressure equalizing pipe 14 Check valve

Claims

A drain flow pipe connected to a heat exchanger to which a gas supply tank is connected, in which the drain generated by the condensation of the gas in the heat exchanger naturally flows;
A drain tank connected to the drain downflow pipe and into which the drain flows;
A pressure equalizing pipe having one end communicating with the gas layer of the drain tank and the other end connected to the supply tank;
A drain recovery device comprising a check valve provided in the pressure equalizing pipe and allowing only a flow from the drain tank toward the supply tank.