JP7125885B2 - Drain recovery system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drain recovery system for recovering drain generated by using latent heat of steam generated in a steam supply source to heat an object to be heated.

A steam source, such as a boiler, heats water supplied from a feed water tank to produce steam. The steam produced by the steam supply is supplied to steam consuming equipment such as heat exchangers. In the steam consuming equipment, the latent heat of steam is used to heat the object to be heated, resulting in drainage. Drainage is collected in the water supply tank.

JP-A-61-1902

The drain is fed to a relatively vertically upper position in the water supply tank whose internal pressure has been brought to atmospheric pressure. On the other hand, the water stored in the water supply tank is delivered to the steam supply source from a position relatively vertically below the side surface of the water supply tank, for example. For this reason, in this configuration, when water is stored in the water supply tank, the heat of the high-temperature drain is difficult to transfer to the water supplied to the steam supply source, and the temperature of the water supplied to the steam supply source increases. remained low.

Here, as in Patent Document 1, drain is separated into a gas component and a liquid component by a pressurized steam-water separator, and after the liquid component is cooled by a subcooler, the cooled liquid component is delivered to the steam supply source. A technique for doing so is disclosed. However, even in such technology, the temperature of the water supplied to the steam supply source is low.

SUMMARY OF THE INVENTION In view of such problems, an object of the present invention is to provide a drain recovery system capable of increasing the temperature of water supplied to a steam supply source.

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid distribution part whose end communicates with the water supply pipe and guides the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, and a shower pipe that communicates with the gas distribution part and guides water to the gas distribution part. a spout that is provided at the tip of the shower pipe and opens into the gas circulation portion; a level meter that detects the water level in the water supply tank; a control valve that opens and closes the flow path in the shower pipe; and a control unit that controls the degree of opening of the control valve based on the result .

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid distribution part whose end communicates with the water supply pipe and guides the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, and a shower pipe that communicates with the gas distribution part and guides water to the gas distribution part. , a spout that is provided at the tip of the shower pipe and opens into the gas circulation part, a heat recovery temperature sensor that detects the temperature in the liquid circulation part , a control valve that opens and closes the flow path in the shower pipe, and a heat recovery temperature a control unit that controls the opening of the control valve based on the detection result of the sensor.

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid distribution part whose end communicates with the water supply pipe and guides the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, and a shower pipe that communicates with the gas distribution part and guides water to the gas distribution part. , a spout provided at the tip of the shower pipe that opens into the gas circulation part, a drain temperature sensor that detects the temperature in the drain pipe that supplies drain to the separator, and a shut valve that opens and closes the flow path in the shower pipe. and a controller that controls the opening of the shut valve based on the detection result of the drain temperature sensor.

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid distribution part whose end communicates with the water supply pipe and guides the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, and a shower pipe that communicates with the gas distribution part and guides water to the gas distribution part. , a spout that is provided at the tip of the shower pipe and opens into the gas circulation part, a drain temperature sensor that detects the temperature in the drain pipe that supplies drain to the separator, and a level gauge that detects the water level in the water supply tank. , a shut valve for opening and closing the flow path in the shower pipe, and a control unit for controlling the degree of opening of the shut valve based on the detection result of the drain temperature sensor and the detection result of the level meter.

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid distribution part whose end communicates with the water supply pipe and leads the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, a position where the liquid distribution part communicates in the water supply pipe, and the water supply tank. A check valve is provided between the water supply tank and prevents a flow in the direction toward the water supply tank, and a communication pipe is provided to communicate the liquid circulation part and the water supply tank.

Also, the pressure loss caused by the communication pipe may be greater than the pressure loss caused by the liquid flow portion.

In addition, the end of the communication pipe on the side of the liquid circulation portion may be positioned vertically above the end on the side of the water supply tank.

In order to solve the above problems, the drain recovery system of the present invention includes: a water supply tank; A separator that separates the drain generated by the heat exchange of the above into a liquid component and a gas component at atmospheric pressure, a gas distribution part that guides the gas component separated by the separator to the water supply tank, one end to the separator, the other A liquid circulation part whose end communicates with the water supply pipe and leads the liquid component separated by the separator to the water supply pipe without passing through the water supply tank, an overflow pipe communicating with the liquid circulation part, and a flow path in the overflow pipe. An overflow valve that opens and closes, a drain temperature sensor that detects the temperature in the drain pipe that supplies drain to the separator, and a controller that controls the opening of the overflow valve based on the detection result of the drain temperature sensor. be .

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to raise the temperature of the water supplied to a steam supply source.

1 is a schematic diagram showing the configuration of a steam heat exchange unit to which the drain recovery system according to the first embodiment is applied; FIG. FIG. 4 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a second embodiment is applied; FIG. 4 is a partially enlarged view of the connecting portion between the shower pipe and the gas flow pipe; It is an explanatory view explaining a drain collection system of a 2nd embodiment. FIG. 11 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a third embodiment is applied; FIG. 11 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a fourth embodiment is applied; FIG. 11 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a fifth embodiment is applied; FIG. 11 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a sixth embodiment is applied; FIG. 11 is a schematic diagram showing the configuration of a steam heat exchange unit to which a drain recovery system according to a seventh embodiment is applied;

Aspects of embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

(First embodiment)
FIG. 1 is a schematic diagram showing the configuration of a steam heat exchange unit 1 to which a drain recovery system 10 according to the first embodiment is applied. In FIG. 1, the direction of water, steam and condensate flow is indicated by solid arrows, and the direction of signal flow is indicated by dashed arrows.

The steam heat exchange unit 1 includes a drain recovery system 10 , a steam supply source 12 , a water supply pump 14 and steam consuming equipment 16 . The drain recovery system 10 includes a water supply tank 20, a make-up water pipe 22, a water supply pipe 24, a drain pipe 26, a separator 28, a gas flow pipe 30, a liquid flow pipe 32, a vent pipe 34, a level gauge 36, a make-up water valve 38, and a control. A unit 40 is included.

The water supply tank 20 is, for example, a cylindrical container. A supply water pipe 22 extending from a water softener (not shown) is connected to the water supply tank 20 . The water supply tank 20 stores water supplied through the supply water pipe 22 . In addition, in FIG. 1, the water in the water supply tank 20 is indicated by hatching.

The water supply pipe 24 is connected near the bottom surface of the side surface of the water supply tank 20 and communicates with the inside of the water supply tank 20 . The water supply pipe 24 communicates with the steam supply source 12 via the water supply pump 14 . The water supply pump 14 sends the water in the water supply tank 20 to the steam supply source 12 through the water supply pipe 24 . That is, the water supply pipe 24 guides the water in the water supply tank 20 to the steam supply source 12 .

The steam supply source 12 is, for example, a boiler, and heats water (feed water) supplied through the water supply pipe 24 to generate steam. Steam produced by steam source 12 is channeled to steam consuming equipment 16 . Steam consuming equipment 16 is, for example, a heat exchanger. In the steam consuming device 16, heat is exchanged between steam and an object to be heated (for example, air or water), and the latent heat of the steam heats the object to be heated. When the latent heat of the steam is used to heat the object to be heated (when the latent heat of the steam moves to the object to be heated), the temperature of the steam drops, the steam condenses, and drainage occurs.

A drain pipe 26 communicates between the steam consuming device 16 and a separator 28 . Drain generated in the steam consuming equipment 16 is sent to the separator 28 through the drain pipe 26 . That is, the drain pipe 26 guides the drain to the separator 28 .

The separator 28 is composed of, for example, a pipe having a larger cross-sectional area than the cross-sectional area of the drain pipe 26 . The inside of the separator 28 is set to atmospheric pressure. The gas flow pipe 30 communicates with the vertical upper portion of the separator 28 . The gas distribution pipe 30 is inserted into the water supply tank 20 from vertically above the water supply tank 20 . The tip of the gas distribution pipe 30 inserted into the water supply tank 20 is positioned above the water surface in the water supply tank 20 .

One end of the liquid flow pipe 32 communicates with the vertical lower portion (bottom) of the separator 28 , and the other end communicates with the water supply pipe 24 . The end of the liquid flow pipe 32 on the water supply pipe 24 side is located between the water supply tank 20 and the water supply pump 14 in the water supply pipe 24 .

The separator 28 separates the drain supplied through the drain pipe 26 into a liquid component and a gaseous component at atmospheric pressure. Specifically, the drain supplied through the drain pipe 26 is in a gas-liquid mixed state in which a gas component (steam) and a liquid component (water) are mixed. When this drain enters the separator 28 , the liquid component of the drain moves vertically downward under its own weight and enters the liquid flow pipe 32 . On the other hand, since the gas component of the drain is relatively lighter than the liquid component, it mainly diffuses vertically upward and enters the gas flow pipe 30 .

Also, the drain generated in the steam consuming equipment 16 is at a pressure higher than the atmospheric pressure and at a temperature of 100° C. or higher. When this drain enters the separator 28 through the drain pipe 26, the liquid component of the drain becomes 100° C. at atmospheric pressure because the pressure inside the separator 28 is atmospheric. Then, the liquid component of the drain uses the latent heat of the pressure difference generated by the pressure drop to change part of the liquid component into steam (flash steam). The vapor (flash vapor) generated in this way is also included in the gaseous component of the drain that enters the gas flow pipe 30 .

The gas components (including flash steam) separated by the separator 28 are sent to the water supply tank 20 through the gas flow pipe 30 . In other words, the gas distribution pipe 30 functions as a gas distribution section that guides the separated gas component to the water supply tank 20 .

A vent pipe 34 that communicates the inside and outside of the water supply tank 20 is provided on the top of the water supply tank 20 . A part of the steam sent to the water supply tank 20 is released outside the water supply tank 20 through the vent pipe 34 .

The liquid component separated by the separator 28 is sent to the water supply pipe 24 through the liquid distribution pipe 32 . That is, the liquid distribution pipe 32 functions as a liquid distribution section that guides the separated liquid component to the water supply pipe 24 without passing through the water supply tank 20 .

The temperature of the water sent from the water supply tank 20 to the water supply pipe 24 is, for example, approximately 20°C. On the other hand, the temperature of the liquid component sent to the water supply pipe 24 through the liquid flow pipe 32 is about 100°C. Therefore, in the water supply pipe 24, the high-temperature liquid component sent through the liquid circulation pipe 32 and the low-temperature water sent from the water supply tank 20 are mixed. The temperature of this mixed water is, for example, within the range of about 80°C to about 90°C as the upper limit and about 60°C as the lower limit. Water (mixed water) having such a temperature is supplied to the water supply pump 14 and the steam supply source 12 .

A level gauge 36 for detecting the water level in the water supply tank 20 is provided inside the water supply tank 20 . The makeup water pipe 22 is provided with a makeup water valve 38 that opens and closes (turns on or off) the flow path in the makeup water pipe 22 . The control unit 40 is composed of a semiconductor integrated circuit including a central processing unit (CPU), nonvolatile memory, volatile memory, and the like. The control unit 40 controls the opening degree (100% or 0%) of the makeup water valve 38 based on the detection result of the level meter 36 . The control unit 40, for example, opens and closes the make-up water valve 38 so that the water level in the water supply tank 20 is within a predetermined range (for example, between the dashed-dotted line H1 and the dashed-dotted line H2 in FIG. 1).

It should be noted that the opening and closing of the make-up water valve 38 is not limited to the mode in which the control unit 40 controls based on the detection result of the level meter 36 . For example, the make-up water valve 38 may be opened and closed by a ball tap or the like that physically opens and closes the make-up water valve 38 according to the displacement of the water surface. In this case, the controller 40 may not be provided.

An overflow pipe 42 is connected to the side surface of the water supply tank 20 . The overflow pipe 42 communicates with the water tank 20 at a position vertically above the upper limit water level (chain line H2) in the control range of the water level in the water tank 20 . For example, when an abnormality occurs in the opening/closing control of the make-up water valve 38 and excessive water is accumulated in the water supply tank 20 exceeding the upper limit water level, the water in the water supply tank 20 is supplied through the overflow pipe 42. It is discharged outside the tank 20 .

As described above, in the drain recovery system 10 of the first embodiment, the liquid component of the drain having a temperature of about 100° C. is sent directly to the water supply pipe 24 without passing through the water supply tank 20 .

Therefore, according to the drain recovery system 10 of the first embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12 . As a result, in the drain recovery system 10 of the first embodiment, it is possible to reduce the energy required to heat the supplied water in the steam supply source 12 .

Further, in the drain recovery system 10 of the first embodiment, the gas component of the drain is sent to the water supply tank 20 through the gas flow pipe 30 . Thereby, the gaseous component of the drain is not sent to the water supply pump 14 through the water supply pipe 24 . Therefore, in the drain recovery system 10 of the first embodiment, it is possible to prevent cavitation from occurring in the water supply pump 14 .

(Second embodiment)
FIG. 2 is a schematic diagram showing the configuration of a steam heat exchange unit 101 to which a drain recovery system 110 according to the second embodiment is applied. The drain recovery system 110 of the second embodiment differs from the drain recovery system 10 of the first embodiment in that it further has a shower pipe 50, a spout 52, and a control valve 54. FIG. Therefore, the water supply tank 20, the water supply pipe 22, the water supply pipe 24, the drain pipe 26, the separator 28, the gas flow pipe 30, the liquid flow pipe 32, the vent pipe 34, the level gauge 36, and the water supply are equivalent to those of the first embodiment. A detailed description of the valve 38 and the control unit 40 will be omitted, and the shower pipe 50, the jet port 52, and the control valve 54, which have different functions, will be described in detail.

The shower pipe 50 communicates with the make-up water pipe 22 at a position closer to the water softener than the make-up water valve 38 . Also, the shower pipe 50 communicates with the gas flow pipe 30 at a position vertically above the separator 28 . A part of the make-up water is sent to the gas flow pipe 30 through the shower pipe 50 . That is, the shower pipe guides the make-up water to the gas flow pipe 30 .

FIG. 3 is a partially enlarged view of the connecting portion between the shower pipe 50 and the gas flow pipe 30. As shown in FIG. The tip of the shower pipe 50 is provided with an ejection port 52 that opens into the gas circulation pipe 30 . The ejection port 52 opens vertically downward (in the direction of the separator 28). The spout 52 is formed, for example, in the shape of a watering can. Note that the shape of the ejection port 52 is not limited to the shape of a watering can. For example, the ejection port 52 may be provided with a small hole for forming water droplets.

The water (supplementary water) sent through the shower pipe 50 is discharged from the jet port 52 in the form of a shower. In other words, the drain recovery system 110 is configured to pour shower water (shower water) onto the gas component of the drain separated by the separator 28 .

Returning to FIG. 2 , the shower pipe 50 is provided with a control valve 54 that opens and closes the flow path in the shower pipe 50 . The control unit 40 linearly controls the opening (closing) of the control valve 54 based on the detection result of the level meter 36 .

For example, as the water level detected by the level meter 36 decreases, the control unit 40 gradually increases the degree of opening of the control valve 54 to increase the amount of shower discharged into the gas flow pipe 30 . On the other hand, the controller 40 gradually decreases the degree of opening of the control valve 54 as the water level detected by the level gauge 36 increases, thereby reducing the amount of shower discharged into the gas flow pipe 30 .

In addition, the control unit 40 controls the opening of the control valve 54 at the lower limit water level (chain line H1) in the control range of the water level in the water supply tank 20, that is, the water level at which the make-up water valve 38 is changed from the closed state to the open state. to control.

When shower water is applied to the gaseous component of the drain, heat is exchanged between the gaseous component of the drain and the shower water, and the latent heat of the gaseous component of the drain raises the temperature of the shower water. The shower water whose temperature has risen falls vertically downward under its own weight and enters the liquid flow pipe 32 via the separator 28 . Then, the shower water whose temperature has risen is sent to the water supply pipe 24 through the liquid circulation pipe 32 together with the liquid component of the drain. Hereinafter, the liquid component of the drain sent to the liquid flow pipe 32 and the shower water whose temperature has risen may be collectively referred to as heat recovery liquid.

In the water supply pipe 24 , not only the liquid component of the drain but also the shower water whose temperature has risen is mixed with the water delivered from the water supply tank 20 . Therefore, in the drain recovery system 110 of the second embodiment, the temperature of the water supplied to the steam supply source 12 is higher than in the first embodiment.

As described above, in the drain recovery system 110 of the second embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 110 of the second embodiment, it is possible to increase the temperature of the water supplied to the steam supply source 12, as in the first embodiment.

Furthermore, in the drain recovery system 110 of the second embodiment, the temperature of the water supplied to the steam supply source 12 is raised by using not only the heat of the liquid component of the drain but also the heat of the gaseous component of the drain. Therefore, in the drain recovery system 110 of the second embodiment, the temperature of the water supplied to the steam supply source 12 can be efficiently increased.

Also, in the drain recovery system 110 of the second embodiment, the amount of shower increases when the water level in the water supply tank 20 is low. When the amount of shower increases, the amount of heat recovery liquid flowing through the liquid distribution pipe 32 increases, and the amount of water sent from the water supply tank 20 to the water supply pipe 24 relatively decreases. Therefore, in the drain recovery system 110 of the second embodiment, when the water level in the water tank 20 is low, the speed at which the water level in the water tank 20 decreases can be moderated.

In addition, in the drain recovery system 110 of the second embodiment, the amount of shower is reduced when the water level in the water supply tank 20 is high. When the amount of shower decreases, the amount of heat recovery liquid flowing through the liquid distribution pipe 32 decreases, and the amount of water sent from the water supply tank 20 to the water supply pipe 24 relatively increases. Therefore, in the drain recovery system 110 of the second embodiment, when the water level in the water tank 20 is high, the speed at which the water level in the water tank 20 rises can be moderated.

In addition, in the drain recovery system 110 of the second embodiment, the opening of the control valve 54 is controlled above the lower limit water level (chain line H1). , the shower water is fed into the gas flow pipe 30 . Therefore, in the drain recovery system 110 of the second embodiment, the heat recovery liquid can be efficiently generated, and the temperature of the water supplied to the steam supply source 12 can be efficiently increased.

In addition, in the drain recovery system 110 of the second embodiment, the opening/closing control of the control valve 54 and the opening/closing control of the supplementary water valve 38 are performed by the common control unit 40 . However, the opening/closing control of the control valve 54 and the opening/closing control of the supplementary water valve 38 may be performed by separate control units 40 . Further, when the opening/closing control of the supplementary water valve 38 is performed by a physical mechanism such as a ball tap, the control unit 40 may not be involved in the opening/closing control of the supplementary water valve 38, and may perform only the opening/closing control of the control valve 54. .

(Third embodiment)
FIG. 4 is an explanatory diagram illustrating the drain recovery system 110 of the second embodiment. Here, the water supply pump 14 normally starts operating when the water level in the steam supply source 12 (boiler) becomes equal to or lower than a predetermined lower threshold value (when the water level becomes low), and supplies water to the steam supply source 12 through the water supply pipe 24. supply. On the other hand, the water supply pump 14 stops operating when the water level in the steam supply source 12 (boiler) reaches or exceeds a predetermined upper threshold value (when the water level increases), and the water is supplied through the water supply pipe 24 to the steam supply source 12. interrupt the supply. FIG. 4 shows a state in which the water supply pump 14 has stopped operating.

On the other hand, the steam supply source 12 generates a predetermined amount of steam and continuously supplies the generated steam to the steam consuming device 16 regardless of whether or not water is supplied by the water supply pump 14 . That is, in the steam consuming device 16, drain occurs regardless of whether water is supplied to the steam supply source 12 or not. Therefore, in the drain recovery system 110, a situation may occur in which the water supply pump 14 is stopped and water is not supplied to the steam supply source 12, but the heat recovery liquid is sent to the water supply pipe 24 through the liquid flow pipe 32. .

In such a situation, as shown in FIG. 4, the heat recovery fluid sent to the water supply pipe 24 through the liquid circulation pipe 32 does not flow to the water supply pump 14 (steam supply source 12) side, but to the water supply tank 20. will be sent. Note that the crossed arrow in FIG. 4 indicates that the heat recovery fluid does not flow in the direction of the arrow. The heat recovery liquid sent to the water supply tank 20 stays near the water supply pipe 24 in the water supply tank 20 . As a result, the temperature of the water near the water supply pipe 24 in the water supply tank 20 rises to nearly 100.degree.

Thereafter, when the water supply pump 14 starts operating, the water in the vicinity of the water supply pipe 24 whose temperature has risen to nearly 100° C. is sent to the water supply pipe 24 . As a result, water at a temperature close to 100° C., which is a mixture of the water near the water supply pipe 24 at a temperature close to 100° C. and the heat recovery liquid through the liquid circulation pipe 32 , is supplied to the water supply pump 14 .

When water having a temperature of about 100° C. is supplied to the water supply pump 14, depending on the relationship between the water pressure in the water supply tank 20 and the required head pressure of the water supply pump 14, air bubbles are likely to occur, and cavitation may occur. Therefore, in view of such circumstances, the third embodiment is configured as follows.

FIG. 5 is a schematic diagram showing the configuration of a steam heat exchange unit 201 to which a drain recovery system 210 according to the third embodiment is applied. FIG. 5(a) shows a case where the water supply pump 14 is stopped. FIG. 5(b) shows the case where the water supply pump 14 is operating.

The drain recovery system 210 of the third embodiment differs from the drain recovery system 110 of the second embodiment in that it further has a check valve 60 and a communication pipe 62 . Therefore, the water supply tank 20, the make-up water pipe 22, the water supply pipe 24, the drain pipe 26, the separator 28, the gas distribution pipe 30, the liquid distribution pipe 32, the vent pipe 34, and the level A detailed description of the total 36, the make-up water valve 38, the control unit 40, the shower pipe 50, the spout 52, and the control valve 54 will be omitted, and the check valve 60 and the communication pipe 62, which have different functions, will be described in detail.

The check valve 60 is provided between the water supply pipe 24 and the water supply tank 20 at a position where the liquid flow pipe 32 communicates with the water supply pipe 24 . The check valve 60 permits flow from the water supply tank 20 toward the steam supply 12 and blocks flow from the steam supply 12 and the liquid flow line 32 toward the water supply tank 20 .

The communication pipe 62 communicates between the liquid distribution pipe 32 and the water supply tank 20 . The end portion of the communication pipe 62 on the side of the liquid distribution pipe 32 and the end portion on the side of the water supply tank 20 are located at approximately the same height. The communication pipe 62 is provided vertically above the water supply pipe 24 and below the water surface of the water supply tank 20 . Specifically, the communication pipe 62 is provided at a position close to the lower limit water level (one-dot chain line H1) or lower in the control range of the water level in the water supply tank 20 by the control unit 40 . In addition, the end portion of the communication pipe 62 on the side of the water supply tank 20 is vertically separated from the position where the water supply pipe 24 of the water supply tank 20 communicates.

The communication pipe 62 is configured such that the pressure loss caused by the communication pipe 62 is greater than the pressure loss caused by the liquid circulation pipe 32 . Specifically, the inner diameter and inner cross-sectional area of the communicating tube 62 are smaller than the inner diameter and inner cross-sectional area of the liquid flow tube 32 . For example, when the inner diameter of the liquid flow tube 32 is about 53 mm, the inner diameter of the communicating tube 62 is about 9 mm. In other words, the internal cross-sectional area of the communication pipe 62 is approximately 1/33 of the internal cross-sectional area of the liquid flow pipe 32 . Note that the specific numerical values of the inner diameter and internal cross-sectional area of the communicating pipe 62 are not limited to this example.

As shown in FIG. 5( a ), when the water supply pump 14 stops, the heat recovery liquid continues to be sent to the liquid flow pipe 32 . However, since the water supply pipe 24 is provided with the check valve 60 , the heat recovery liquid does not flow to the water supply tank 20 via the water supply pipe 24 .

On the other hand, since the liquid circulation pipe 32 is provided with the communication pipe 62 , the heat recovery liquid overflows from the liquid circulation pipe 32 through the communication pipe 62 into the water supply tank 20 . As a result, the heat-recovery liquid stays in the vicinity of the communication pipe 62 in the water supply tank 20 which is relatively far from the water supply pipe 24 .

After that, as shown in FIG. 5B, when the water supply pump 14 starts operating, low-temperature water near the water supply pipe 24 in the water supply tank 20 is sent to the water supply pump 14 side through the check valve 60 . The water supply pump 14 is supplied with mixed water in which the water that has flowed through the check valve 60 and the heat recovery liquid in the liquid flow pipe 32 are mixed. The temperature of this mixed water is, for example, within the range of about 80°C to about 90°C as the upper limit and about 60°C as the lower limit.

Further, as described above, the pressure loss due to the communication pipe 62 is greater than the pressure loss due to the liquid distribution pipe 32 . Therefore, when the water supply pump 14 is operating, the heat recovery liquid in the liquid circulation pipe 32 hardly flows through the communication pipe 62 and is sent to the water supply pipe 24 through the liquid circulation pipe 32 . The crossed-out arrow in parenthesis in FIG. 5B indicates that the heat recovery fluid hardly flows from the liquid flow pipe 32 to the water supply tank 20 through the communication pipe 62 .

The pressure loss due to the communication pipe 62 may be greater than the pressure loss due to the water supply pipe 24 . In this case, when the water supply pump 14 is operating, the water in the water supply tank 20 is sent to the water supply pipe 24 rather than flowing through the communication pipe 62 .

As described above, in the drain recovery system 210 of the third embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 210 of the third embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12, as in the first and second embodiments.

Furthermore, in the drain recovery system 210 of the third embodiment, even if the water supply pump 14 stops, the high-temperature heat recovery liquid does not stay near the water supply pipe 24 of the water supply tank 20 . Therefore, in the drain recovery system 210 of the third embodiment, when the water supply pump 14 starts operating, it is possible to avoid sending water of around 100° C. to the water supply pump 14 . Therefore, in the drain recovery system 210 of the third embodiment, variations in the upper limit temperature of mixed water due to repeated operation and stop of the water supply pump 14 can be suppressed, and cavitation can be prevented.

(Fourth embodiment)
FIG. 6 is a schematic diagram showing the configuration of a steam heat exchange unit 301 to which a drain recovery system 310 according to the fourth embodiment is applied. FIG. 6(a) shows a case where the water supply pump 14 is stopped. FIG. 6(b) shows the case where the water supply pump 14 is operating.

A drain recovery system 310 of the fourth embodiment differs from the drain recovery system 210 of the third embodiment in that it has a communication pipe 72 instead of the communication pipe 62 . Therefore, the water supply tank 20, the make-up water pipe 22, the water supply pipe 24, the drain pipe 26, the separator 28, the gas circulation pipe 30, the liquid circulation pipe 32, the ventilation pipe 34, and the level A detailed description of the total 36, the make-up water valve 38, the control unit 40, the shower pipe 50, the spout 52, the control valve 54, and the check valve 60 will be omitted, and the communication pipe 72 having different functions will be described in detail.

The communication pipe 72 communicates between the liquid distribution pipe 32 and the water supply tank 20 . The communicating pipe 72 is provided at an angle with respect to the horizontal plane. An end portion 76 of the communication pipe 72 on the side of the liquid flow pipe 32 is positioned vertically above an end portion 74 on the side of the water supply tank 20 .

Specifically, the end portion 74 of the communication pipe 72 on the side of the water tank 20 is below the lower limit water level (chain line H1) in the control range of the water level in the water tank 20 by the control unit 40, and is positioned near the lower limit water level. do. An end portion 74 of the communication pipe 72 on the water tank 20 side is separated vertically upward from a position where the water supply pipe 24 in the water tank 20 communicates. On the other hand, the end portion 76 of the communication pipe 72 on the side of the liquid distribution pipe 32 is positioned above the upper limit water level (chain line H2) in the control range of the water level in the water supply tank 20 by the controller 40 . An end portion 76 of the communication pipe 72 on the side of the liquid distribution pipe 32 is positioned vertically below the position where the overflow pipe 42 communicates with the water supply tank 20 .

As shown in FIG. 6A, when the water supply pump 14 stops, the heat recovery liquid continues to be sent to the liquid circulation pipe 32, but the water in the water supply pipe 24 stops flowing. Therefore, the heat recovery liquid accumulates in the liquid circulation pipe 32 and the water level in the liquid circulation pipe 32 becomes higher than the water level in the water supply tank 20 .

When the water level in the liquid flow pipe 32 exceeds the height of the end 76 on the side of the liquid flow pipe 32 , the heat recovery liquid in the liquid flow pipe 32 overflows and enters the communication pipe 72 . As a result, the heat recovery liquid overflows into the water supply tank 20 through the communication pipe 72 and stays in the vicinity of the communication pipe 72 in the water supply tank 20 at a position relatively far from the water supply pipe 24 .

After that, as shown in FIG. 6B, when the water supply pump 14 starts operating, low-temperature water near the water supply pipe 24 in the water supply tank 20 is delivered to the water supply pump 14 side through the check valve 60 . Therefore, in the drain recovery system 310 , it is possible to avoid sending water around 100° C. to the water supply pump 14 .

Also, when the water supply pump 14 is operating, the water level in the liquid circulation pipe 32 is substantially the same as the water level in the water supply tank 20 , so the heat recovery liquid does not enter the communication pipe 72 . Therefore, in the drain recovery system 310, the heat recovery liquid can be efficiently delivered to the water supply pipe 24 when the water supply pump 14 is in operation.

The inner diameter and internal cross-sectional area of the communication pipe 72 do not have to be smaller than the inner diameter and internal cross-sectional area of the liquid flow pipe 32 .

As described above, in the drain recovery system 310 of the fourth embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 310 of the fourth embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12, as in the first to third embodiments.

Further, in the drain recovery system 310 of the fourth embodiment, similarly to the third embodiment, variation in the upper limit temperature of the mixed water due to repeated operation and stop of the water supply pump 14 can be suppressed, and cavitation can be prevented.

Note that the communication pipe 72 of the drain recovery system 310 of the fourth embodiment is inclined with respect to the horizontal plane. However, the communication pipe 72 need only have an end portion 76 on the side of the liquid distribution pipe 32 located vertically above an end portion 74 on the side of the water supply tank 20, and does not have to be inclined. For example, the communicating pipe 72 may be bent stepwise.

(Fifth embodiment)
FIG. 7 is a schematic diagram showing the configuration of a steam heat exchange unit 401 to which a drain recovery system 410 according to the fifth embodiment is applied. The drain recovery system 410 of the fifth embodiment has a liquid circulation pipe 80 instead of the liquid circulation pipe 32, and further has an overflow pipe 82, an overflow valve 84, and a drain temperature sensor 86, similar to the drain recovery of the third embodiment. Differs from system 210 . Therefore, a water supply tank 20, a makeup water pipe 22, a water supply pipe 24, a drain pipe 26, a separator 28, a gas flow pipe 30, a vent pipe 34, a level gauge 36, and a makeup water having the same functions as those of the first to third embodiments A detailed description of the valve 38, the control unit 40, the shower pipe 50, the ejection port 52, the control valve 54, the check valve 60, and the communication pipe 62 is omitted, and the liquid flow pipe 80, overflow pipe 82, and The overflow valve 84 and the drain temperature sensor 86 are detailed.

The liquid circulation pipe 80 is composed of a first vertical section 80a, a horizontal section 80b and a second vertical section 80c, and functions as a liquid circulation section. The first vertical portion 80 a communicates with the vertical lower portion (bottom portion) of the separator 28 and extends vertically downward from the separator 28 . The horizontal portion 80b communicates with the first vertical portion and extends horizontally from the first vertical portion 80a. The second vertical portion 80c communicates with the horizontal portion 80b and extends in the vertical direction. The second vertical portion 80 c communicates with the water supply pipe 24 between the water supply pump 14 and the check valve 60 in the water supply pipe 24 .

The horizontal portion 80 b is positioned vertically above the water surface in the water supply tank 20 . Specifically, the horizontal portion 80b is positioned above the upper limit water level (chain line H2) in the control range of the water level in the water supply tank 20 by the control section 40 .

The communication pipe 62 communicates the second vertical portion 80 c and the water supply tank 20 . The communication pipe 62 is provided horizontally below the lower limit water level (one-dot chain line H1) in the control range of the water level in the water supply tank 20 by the controller 40 . The communication pipe 62 is configured such that pressure loss due to the communication pipe 62 is greater than pressure loss due to the liquid flow pipe 80 .

The overflow pipe 82 communicates with the first vertical portion 80a and extends vertically downward from the connection position between the first vertical portion 80a and the horizontal portion 80b. The tip of the overflow pipe 82 is open. The overflow pipe 82 is provided with an overflow valve 84 that opens and closes (turns on or off) the flow path of the overflow pipe 82 .

The drain pipe 26 is provided with a drain temperature sensor 86 that detects the temperature inside the drain pipe 26 . The controller 40 controls the degree of opening (100% or 0%) of the overflow valve 84 based on the detection result of the drain temperature sensor 86 . Specifically, the control unit 40 opens the overflow valve 84 when the temperature detected by the drain temperature sensor 86 is below a predetermined temperature, and opens the overflow valve 84 when the temperature detected by the drain temperature sensor 86 is equal to or higher than the predetermined temperature. 84 is closed. The predetermined temperature is set to, for example, 60° C. between 20° C. and 100° C., for example.

For example, the steam heat exchange unit 401 is assumed to be on during the day and off at night. In the steam heat exchange unit 401, the drain generated in the steam consuming equipment 16 before the steam heat exchange unit 401 is stopped may remain in the drain pipe 26 after the steam heat exchange unit 401 is stopped. As time passes after the steam heat exchange unit 401 is stopped, the temperature inside the drain pipe 26 gradually decreases. Then, the gas component of the drain in the drain pipe 26 is condensed and changed into a liquid component, and the condensed liquid component stays in the drain pipe 26 .

Also, when the gaseous component of the drain is condensed, air enters the drain pipe 26 through the gas flow pipe 30 and the separator 28 . As described above, the liquid component of the drain stays in the drain pipe 26, and air is introduced into the drain pipe 26, so rust is likely to occur.

In the drain recovery system 410, the overflow valve 84 opens when the steam heat exchange unit 401 is stopped and the temperature inside the drain pipe 26 drops below a predetermined temperature. The overflow valve 84 is kept open until the steam heat exchange unit 401 is activated next time (for example, the next morning) and the temperature inside the drain pipe 26 reaches or exceeds a predetermined temperature.

Further, in the steam heat exchange unit 401, it takes time for the temperature inside the drain pipe 26 to reach a predetermined temperature or higher after starting. After the steam heat exchange unit 401 is activated, the liquid component containing rust remaining in the drain pipe 26 until the temperature in the drain pipe 26 reaches a predetermined temperature or higher is removed by the activation of the steam heat exchange unit 401. The newly generated drain moves to the separator 28 side. The liquid component containing the rust is discharged outside through the first vertical portion 80a and the overflow pipe 82. As shown in FIG.

Also, the temperature of the liquid component of the drain is not sufficiently high (cool) immediately after the steam heat exchange unit 401 is started. In the drain recovery system 410 , liquid components having a low temperature immediately after starting the steam heat exchange unit 401 can be discharged outside through the first vertical portion 80 a and the overflow pipe 82 .

As described above, in the drain recovery system 410 of the fifth embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 410 of the fifth embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12, as in the first to fourth embodiments.

Furthermore, in the drain recovery system 410 of the fifth embodiment, when the steam heat exchange unit 401 is activated, the liquid component containing rust and the liquid component with a low temperature can be efficiently discharged to the outside through the overflow pipe 82 . As a result, in the drain recovery system 410 of the fifth embodiment, water containing rust can be prevented from being supplied to the steam supply source 12 .

In addition, in the drain recovery system 410 of the fifth embodiment, not only rust but also dust can be discharged from the overflow pipe 82 .

Further, in the drain recovery system 410 of the fifth embodiment, when the steam heat exchange unit 401 is activated, liquid components including rust and the like may be discharged from the overflow pipe 82, and new water may be supplied through the make-up water pipe 22. . According to this aspect, the water in the steam supply 12 can be refreshed.

Further, in the drain recovery system 410 of the fifth embodiment, the tip of the gas circulation pipe 30 is positioned vertically above the water surface in the water supply tank 20 . However, depending on the case, the tip of the gas flow pipe 30 may be configured to be positioned below the water surface in the water supply tank 20 . In this configuration, when the temperature in the drain pipe 26 drops and the drain condenses, water in the water supply tank 20 may be sucked up through the gas flow pipe 30 .

In contrast, in the drain recovery system 410 of the fifth embodiment, air is introduced into the drain pipe 26 through the overflow pipe 82 when the temperature inside the drain pipe 26 drops and the overflow valve 84 opens. Therefore, in the drain recovery system 410 of the fifth embodiment, water in the water supply tank 20 can be prevented from being sucked up through the gas circulation pipe 30 .

(Sixth embodiment)
FIG. 8 is a schematic diagram showing the configuration of a steam heat exchange unit 501 to which a drain recovery system 510 according to the sixth embodiment is applied. The drain recovery system 510 of the sixth embodiment differs from the drain recovery system 410 of the fifth embodiment in that it further has a shut valve 90 . Therefore, a water supply tank 20, a makeup water pipe 22, a water supply pipe 24, a drain pipe 26, a separator 28, a gas flow pipe 30, a vent pipe 34, a level gauge 36, and a makeup water which have the same functions as those of the first to fifth embodiments. Details of the valve 38, the control unit 40, the shower pipe 50, the spout 52, the control valve 54, the check valve 60, the communication pipe 62, the liquid flow pipe 80, the overflow pipe 82, the overflow valve 84, and the drain temperature sensor 86 are given below. A detailed description will be omitted, and the shut valve 90 having different functions will be described in detail.

A shut valve 90 is provided between the make-up water pipe 22 and the control valve 54 in the shower pipe 50 . The shut valve 90 opens and closes (turns on or off) the channel in the shower pipe 50 .

The control unit 40 controls the opening degree (100% or 0%) of the shut valve 90 based on the detection result of the drain temperature sensor 86 . Specifically, the control unit 40 closes the shut valve 90 when the temperature of the drain temperature sensor 86 is below a predetermined temperature, and opens the shut valve 90 when the temperature of the drain temperature sensor 86 is equal to or higher than the predetermined temperature. .

That is, in the drain recovery system 510 of the sixth embodiment, the supply of shower water through the shower pipe 50 is stopped when the steam heat exchange unit 501 stops and the temperature inside the drain pipe 26 falls below the predetermined temperature. In addition, in the drain recovery system 510 of the sixth embodiment, when the steam heat exchange unit 501 is activated and the temperature inside the drain pipe 26 reaches or exceeds a predetermined temperature, supply of shower water through the shower pipe 50 is started. Note that the amount of shower discharged into the gas flow pipe 30 is controlled by the opening of the control valve 54 .

As described above, in the drain recovery system 510 of the sixth embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 510 of the sixth embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12, as in the first to fifth embodiments.

Furthermore, in the drain recovery system 510 of the sixth embodiment, the shower water can be efficiently applied to the gaseous components of the drain.

(Seventh embodiment)
FIG. 9 is a schematic diagram showing the configuration of a steam heat exchange unit 601 to which a drain recovery system 610 according to the seventh embodiment is applied. The drain recovery system 610 of the seventh embodiment further has a heat recovery temperature sensor 92, and the specific control by the controller 40 differs from the drain recovery system 510 of the sixth embodiment. Therefore, a water supply tank 20, a makeup water pipe 22, a water supply pipe 24, a drain pipe 26, a separator 28, a gas flow pipe 30, a vent pipe 34, a level gauge 36, and a makeup water having the same functions as those of the first to sixth embodiments are provided. Valve 38, shower pipe 50, spout 52, control valve 54, check valve 60, communication pipe 62, liquid flow pipe 80, overflow pipe 82, overflow valve 84, drain temperature sensor 86, and shut valve 90 are detailed below. A detailed explanation will be omitted, and the control by the heat recovery temperature sensor 92 and the control unit 40, which have different functions, will be described in detail.

The heat recovery temperature sensor 92 is provided on the second vertical portion 80 c of the liquid flow pipe 80 . The heat recovery temperature sensor 92 detects the temperature inside the liquid flow pipe 80 (inside the second vertical portion 80c).

The controller 40 linearly controls the opening of the control valve 54 based on the detection result of the heat recovery temperature sensor 92 . Specifically, the control unit 40 controls the opening degree of the control valve 54 so that the detection result of the heat recovery temperature sensor 92 is maintained at a predetermined target temperature. The predetermined target temperature is, for example, 95°C.

The temperature of the shower water supplied to the gas flow pipe 30 rises due to the gas component of the drain, but the temperature of the shower water after the temperature rise is often relatively lower than the liquid component of the drain. Therefore, for example, if the current temperature detected by the heat recovery temperature sensor 92 exceeds the target temperature, the controller 40 increases the opening of the control valve 54 to increase the amount of shower. As a result, the temperature of the heat recovery liquid drops, and the temperature inside the liquid flow pipe 80 returns to the target temperature. Also, if the current temperature detected by the heat recovery temperature sensor 92 is lower than the target temperature, the controller 40 reduces the opening of the control valve 54 to reduce the amount of shower. As a result, the temperature of the heat recovery liquid rises, and the temperature inside the liquid circulation pipe 80 returns to the target temperature.

Also, the control unit 40 controls the opening degree (100% or 0%) of the shut valve 90 based on the detection result of the drain temperature sensor 86 and the detection result of the level meter 36 .

Specifically, when the temperature in the drain pipe 26 detected by the drain temperature sensor 86 is equal to or higher than a predetermined temperature, and the water level in the water supply tank 20 detected by the level gauge 36 is equal to or lower than a predetermined lower limit water level. , the opening degree of the shut valve 90 is set to 100% (the shut valve 90 is opened).

The predetermined temperature is set to, for example, 60° C. between 20° C. and 100° C., for example. The predetermined temperature here may be the same as or different from the predetermined temperature that is the criterion for determining the degree of opening of the overflow valve 84 in the fifth embodiment.

Also, the predetermined lower water level is set to a water level higher than the lower water level (one-dot chain line H1) at which the make-up water valve 38 is opened, for example. In FIG. 9, the lower limit water level for opening the shut valve 90 is indicated by a dashed line H3. The lower limit water level (chain line H3) for opening the shut-off valve 90 should be higher than the lower limit water level (chain line H1) for opening the make-up water valve 38, and the upper limit water level (chain line H2) for opening the make-up water valve 38 ) or higher than the upper limit water level (chain line H2) at which the make-up water valve 38 is opened.

That is, in the drain recovery system 610, when a sufficient amount of time has passed since the steam heat exchange unit 601 was activated, shower water is supplied with priority over replenishment of the water supply tank 20 with makeup water.

Further, when the water level in the water supply tank 20 indicated by the level gauge 36 exceeds a predetermined upper limit water level, the control unit 40 sets the degree of opening of the shut valve 90 to 0% (closes the shut valve 90). The control unit 40 closes the shut valve 90 without depending on the temperature inside the drain pipe 26 detected by the drain temperature sensor 86 .

The predetermined upper water level is, for example, higher than the lower water level (one-dot chain line H3) that opens the shut valve 90 and higher than the upper water level (one-dot chain line H2) that opens the make-up water valve 38. In FIG. 9, the upper limit water level at which the shut valve 90 is closed is indicated by a one-dot chain line H4. That is, in the drain recovery system 610, stopping the supply of makeup water to the water supply tank 20 is prioritized over stopping the supply of shower water.

As described above, in the drain recovery system 610 of the seventh embodiment, the heat recovery liquid is sent directly to the water supply pipe 24 without passing through the water supply tank 20 . Therefore, according to the drain recovery system 610 of the seventh embodiment, it is possible to raise the temperature of the water supplied to the steam supply source 12, as in the first to sixth embodiments.

Furthermore, in the drain recovery system 610 of the seventh embodiment, the opening of the control valve 54 is controlled so that the detection result of the heat recovery temperature sensor 92 is maintained at a predetermined target temperature. is maintained at the target temperature. Therefore, in the drain recovery system 610 of the seventh embodiment, variations in the temperature of the water supplied to the steam supply source 12 can be suppressed.

Also, in the drain recovery system 610 of the seventh embodiment, the shut valve 90 is opened and closed based on the detection result of the drain temperature sensor 86 and the detection result of the level meter 36 . Therefore, in the drain recovery system 610 of the seventh embodiment, the shower water can be efficiently applied to the gaseous components of the drain.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

For example, features of each embodiment may be combined.

INDUSTRIAL APPLICABILITY The present invention can be used in a drain recovery system that recovers drain generated by using latent heat of steam generated in a steam supply source to heat an object to be heated.

1, 101, 201, 301, 401, 501, 601 steam heat exchange unit 10, 110, 210, 310, 410, 510, 610 drain recovery system 12 steam supply source 20 feed water tank 24 feed water pipe 28 separator 30 gas flow pipe (Gas distribution part)
32, 80 liquid circulation pipe (liquid circulation part)
50 shower pipe 52 spout 54 control valve 60 check valves 62, 72 communication pipe 82 overflow pipe 84 overflow valve 86 drain temperature sensor 90 shut valve 92 heat recovery temperature sensor

Claims (8)

a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
a shower pipe that communicates with the gas circulation portion and guides water to the gas circulation portion;
a spout provided at the tip of the shower pipe and opening into the gas flow part;
a level meter for detecting the water level in the water supply tank;
a control valve for opening and closing a channel in the shower pipe;
a control unit that controls the opening of the control valve based on the detection result of the level meter;
a condensate recovery system. a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
a shower pipe that communicates with the gas circulation portion and guides water to the gas circulation portion;
a spout provided at the tip of the shower pipe and opening into the gas flow part;
a heat recovery temperature sensor that detects the temperature in the liquid flow part;
a control valve for opening and closing a channel in the shower pipe;
a control unit that controls the degree of opening of the control valve based on the detection result of the heat recovery temperature sensor;
a condensate recovery system. a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
a shower pipe that communicates with the gas circulation portion and guides water to the gas circulation portion;
a spout provided at the tip of the shower pipe and opening into the gas flow part;
a drain temperature sensor that detects the temperature in a drain pipe that supplies drain to the separator;
a shut valve for opening and closing a channel in the shower pipe;
a control unit that controls the degree of opening of the shut valve based on the detection result of the drain temperature sensor;
a condensate recovery system. a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
a shower pipe that communicates with the gas circulation portion and guides water to the gas circulation portion;
a spout provided at the tip of the shower pipe and opening into the gas flow part;
a drain temperature sensor that detects the temperature in a drain pipe that supplies drain to the separator;
a level meter for detecting the water level in the water supply tank;
a shut valve for opening and closing a channel in the shower pipe;
a control unit that controls the degree of opening of the shut valve based on the detection result of the drain temperature sensor and the detection result of the level meter;
a condensate recovery system. a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
a check valve provided between a position in the water supply pipe where the liquid circulation portion communicates and the water supply tank, the check valve blocking flow in a direction toward the water supply tank;
a communicating pipe that communicates the liquid circulation portion and the water supply tank;
a condensate recovery system. 6. The drain recovery system according to claim 5 , wherein the pressure loss caused by the communicating pipe is greater than the pressure loss caused by the liquid circulation portion. 6. The drain recovery system according to claim 5 , wherein the end of the communication pipe on the side of the liquid circulation portion is positioned vertically above the end on the side of the water supply tank. a water tank;
a water supply pipe that guides water in the water supply tank to a steam supply source;
a separator that separates drain generated by heat exchange between the steam supplied from the steam supply source and the object to be heated into a liquid component and a gaseous component at atmospheric pressure;
a gas flow section that guides the gas component separated by the separator to the water supply tank;
a liquid circulating unit having one end communicating with the separator and the other end communicating with the water supply pipe, and guiding the liquid component separated by the separator to the water supply pipe without passing through the water supply tank;
an overflow pipe communicating with the liquid flow part;
an overflow valve that opens and closes a flow path in the overflow pipe;
a drain temperature sensor that detects the temperature in a drain pipe that supplies drain to the separator;
a control unit that controls the degree of opening of the overflow valve based on the detection result of the drain temperature sensor;
a condensate recovery system.

Images