WO2018047242A1

WO2018047242A1 - Steam-circulating-system pipeline drying device and pipeline drying method in steam-circulating system

Info

Publication number: WO2018047242A1
Application number: PCT/JP2016/076211
Authority: WO
Inventors: 弘昭平田
Original assignee: 株式会社ビクター特販
Priority date: 2016-09-06
Filing date: 2016-09-06
Publication date: 2018-03-15
Also published as: JP6312187B1; JPWO2018047242A1

Abstract

Provided are a steam-circulating-system pipeline drying device and a pipeline drying method in a steam-supplying system with which it is possible to substantially completely exhaust, to outside the system, drainage that remains in a line, which extends from a steam supplying source to a water supply tank via a steam-utilizing device, after operation of the steam-circulating system is halted, and with which it is possible to dry the inside of the line. A steam-circulating-system drying device comprises: a storage tank 11 that stores normal-temperature water; a circulation pump 12 that causes water inside the storage tank 11 to circulate through circulation piping 13; an ejector 14 that uses water supplied under pressure by the circulation pump 12 as driving water; and a drainage suction pipe 16 that is provided with a switching valve 15, and that connects a drainage suction port 14b of the ejector 14 and a steam drainage pipeline 6 to each other. The steam-circulating-system drying device is connected to a steam-circulating system, and steam and drainage that remain in a pipeline inside the system are sucked by the ejector in order to dry the pipeline.

Description

Pipe drying apparatus for steam circulation system and pipe drying method in steam circulation system

The present invention relates to a pipeline drying apparatus for a steam circulation system and a pipeline drying method in the steam circulation system. In the present invention, “steam” means water vapor.

Since steam is a heat source that can transmit heat uniformly and quickly, it is widely used industrially, and most of it is used for indirect heating that transfers heat to an object to be heated through a heat exchanger. Yes. In indirect heating, the steam that has finished its role only becomes condensed drain and does not affect the object to be heated and the surroundings, so it is widely used in processes such as boiling, drying, and melting. For example, in a linen factory, steam is used as a heat source for equipment for warming washing water and dryers. In addition, it is used as a heat source for beverage container sterilization equipment and waste oil separation and purification equipment, and as a heat source for melting synthetic resin materials and heating molding machines.

As a system using steam, a steam supply source such as a boiler that converts water into steam is connected to the steam supply source via a steam supply pipe, and steam using steam supplied from the steam supply source is used. Equipment, a water supply tank for supplying water to the steam supply source, a water supply pump for supplying water from the water supply tank to the steam supply source, and surplus steam and drain discharged from the steam using equipment are returned to the water supply tank. A steam circulation system including a steam drain line is generally used.

By the way, many of the above steam circulation systems are repeatedly operated and stopped almost every day. Moreover, even if it is continuously operated for many days over many days, it is stopped, for example, at the time of periodic inspection or long-term operation suspension. The steam supplied from the steam supply source to the steam-using equipment before this stoppage is not all returned to the water supply tank when it stops, and many of them are on the route from the steam supply source to the water supply tank via the steam-using equipment. Remains as drain.

¡Drains continue to remain in the pipelines and steam-use equipment while the steam-use equipment is stopped. While this is repeated over a long period of time, corrosion will eventually occur in the pipeline and in the equipment. When corrosion occurs, rust spreads throughout the entire steam circulation system, resulting in complicated maintenance and failure of the system.

Also, since it is inevitable that drain remains in the system after the operation is stopped, the next operation start is performed in that state. Then, the remaining drain is rapidly moved in the system system by the pressure of the steam sent from the steam supply source and is also evaporated rapidly by the heat of the steam. Pipe line shakes greatly. If the pipe shakes repeatedly, the pipe may be cracked or the fitting of the joint portion may be loosened, leading to an accident in the worst case.

Therefore, in order to eliminate the above inconveniences, it is preferable to discharge all the steam outside the system after the operation so that the drain does not remain in the steam circulation system and further dry the system. In this regard, for example, Patent Document 1 discloses a means for drying the inside of a pipe in a steam circulation system.

In Patent Document 1, a water supply tank, a boiler connected to the water supply tank via a pump to generate water vapor, a pressure reducing valve connected to the boiler via a primary side piping system including a main steam on-off valve, A heat exchanger connected to the pressure reducing valve via the secondary piping system, a steam trap that condenses the water vapor that has been heat-exchanged in the heat exchanger, and a return path that returns the condensed water generated in the steam trap to the water supply tank A circulating steam boiler apparatus including a piping system is disclosed. In this apparatus, a branch pipe including the first on-off valve from the primary side pipe system to the return pipe system is connected between the main steam on-off valve and the pressure reducing valve of the primary side pipe system. A second on-off valve is provided downstream of the first on-off valve, and a third on-off valve for selectively opening the branch pipe to the atmosphere is provided between the first on-off valve and the second on-off valve. Is disclosed.

According to this, the second on-off valve is provided on the downstream side of the first on-off valve of the branch pipe, and the branch pipe is selectively opened to the atmosphere between the first on-off valve and the second on-off valve. Since the on-off valve is provided, after the boiler is stopped, the first on-off valve is opened while the third on-off valve is closed, thereby returning the water vapor in the primary side piping system It can be returned to the water supply tank via the piping system, and after the pressure in the primary side piping system has dropped to a predetermined value (preferably 0 Mpa), only the second on-off valve of the first and second on-off valves By closing and opening the third on-off valve, the inside of the primary side piping system is opened to the atmosphere via the branch pipe, so that the inside of the pipe can also be dried.

JP 2008-32350 A

However, the conventional means described above has the disadvantages that it is necessary to provide a large number of on-off valves and pipes, which complicates the apparatus and makes the operation of the valves cumbersome. In addition, since the drying in the piping is performed only by opening the primary side piping system to the atmosphere via the branch piping, the drain remains in the other piping systems and steam using devices. Moreover, the effect cannot be expected as the pipeline becomes longer. Therefore, this means does not fundamentally eliminate the above-mentioned disadvantages.

The present invention has been made to remedy such a problem. After the operation of the steam circulation system is stopped, the drain remaining in the path from the steam supply source to the water supply tank through the steam using equipment is almost completely discharged to the outside of the system. In addition, the present invention provides a pipe drying device for a steam circulation system and a pipe drying method in a steam supply system that can dry the inside of the path.

Therefore, the present invention pays attention to the function of an ejector that has been conventionally used for sucking and recovering drain and surplus steam in a steam circulation system, and not only recovering drain and the like during operation of this ejector, It was found that it can be used for drying in the steam circulation system after operation, and has been completed.

That is, in order to achieve the above object, a steam circulation system pipe drying device according to the present invention is connected to a steam supply source such as a boiler that converts water into steam, and the steam supply source is connected to the steam supply line. A steam using device that uses steam supplied from the steam supply source, a water supply tank that supplies water to the steam supply source, a water supply pump that supplies water from the water supply tank to the steam supply source, and the steam use In a steam circulation system including surplus steam discharged from equipment and a steam drain line for returning drain to the feed water tank, surplus remaining in a path from the steam supply source to the feed water tank through the steam using equipment And a storage tank for storing normal temperature water, and a storage tank for discharging the steam and drain from the system and drying the inside of the passage, and the storage tank A circulation pump that circulates the water through a circulation pipe, an ejector that is interposed in the circulation pipe and that uses water pumped by the circulation pump as drive water, a drain suction port of the ejector, and the steam drain line And a drain suction pipe for connecting the two.

According to this, it is possible to dry all of the inside of the steam drain line of the steam circulation system, the inside of the steam using equipment and the inside of the steam supply pipe.

That is, after stopping the steam supply source of the steam circulation system, the switching valve of the drain suction pipe of this apparatus is switched to connect the drain suction port of the ejector and the steam drain pipe line, while the steam supply source and the steam supply pipe After that, the circulation pump of this equipment is driven and the drive water is pumped to the ejector, so that it remains in the steam supply line and the steam drain line of the steam circulation system and in the steam-using equipment. All the steam and drain that is flowing is sucked by the ejector. Subsequently, the ejector is continuously driven to bring the inside of the steam drain line, the inside of the steam using equipment, and the inside of the steam supply pipe close to the vacuum state in this order, and accordingly, the remaining drain is evaporated. Eventually, everything in the steam drain line, in the steam using equipment, and in the steam supply line will be dried.

Since this apparatus has a simple configuration as described above, it can be provided in a small space and at a low cost. Moreover, since it is only necessary to connect the drain suction pipe to the steam circulation system via a switching valve provided therein, the steam circulation system can be easily connected to the existing steam circulation system. In addition, during use, the switching valve of the drain suction pipe of this device is switched to connect the drain suction port of the ejector and the steam drain line, while between the steam supply source and the steam supply line of the steam circulation system. The facility for simply shutting off and driving the circulation pump of this apparatus is sufficient, and the operation for drying the pipeline does not become a burden for facilities that stop the operation of the steam circulation system every day.

Further, as a method for drying a pipeline in a steam circulation system according to the present invention, when the above-described pipeline drying device for a steam circulation system is used (the invention according to claim 2), and a water supply function to a steam supply source In some cases, a steam circulation system including a heat recovery device including a heat recovery device and an ejector also uses the heat recovery device as a steam circulation system pipe drying device (the invention according to claim 3).

First, a pipe line drying method in a steam circulation system according to a second aspect of the present invention is connected to a steam supply source such as a boiler that converts water into steam, and the steam supply source is connected to the steam supply line through the steam supply line. A steam using device that uses steam supplied from a steam supply source, a water supply tank that supplies water to the steam supply source, a water feed pump that supplies water from the water supply tank to the steam supply source, and an exhaust from the steam using device In the steam circulation system including the steam drain pipe for returning the excess steam and drain to the water supply tank, the steam circulation system drying device is connected to the steam drain pipe of the steam circulation system via the drain suction pipe. After the steam supply source of the steam circulation system is stopped in the state of being connected to the passage, the switching valve of the drain suction pipe of the drying device for the steam circulation system is switched to The steam inlet and the steam drain line are connected, while the steam supply source and the steam supply line are shut off, and then the circulation pump of the drying device for the steam circulation system is driven to drive water to the ejector. The ejector is continued to function by pumping, so that all the steam supply pipes, steam using equipment and steam drain pipes of the steam circulation system are dried.

According to a third aspect of the present invention, there is provided a method of drying a pipe line in a steam circulation system, wherein a steam supply source is connected to the steam supply source via a steam supply pipe and the steam supplied from the steam supply source is supplied. A steam-using device that uses water, and supplies water to the steam supply source, while being connected to the steam-using device via a steam drain line, and is used by the steam that has become surplus in the steam-using device and the steam-using device. Recovering the heat contained in the drain condensed water, and a tank, a circulation pump for circulating the water stored in the tank through a circulation pipe, and the circulation pipe, Steam including a heat recovery device and a steam drying system pipe drying device provided with an ejector that sucks the steam and drain and mixes with the circulating water to recover the steam and drain. In a ring system, after the steam supply source is stopped, the circulation pump of the heat recovery device / pipe drying device for the steam circulation system is driven even after the steam supply source and the steam using device are shut off. The ejector continues to function by circulating the water in the tank through the circulation pipe, so that all the pipes of the steam supply pipe, the steam using equipment and the steam drain pipe of the steam circulation system The inside is dried.

In the invention according to claim 3, since the ejector of the heat recovery device is used for drying the pipeline as the ejector of the pipeline drying device for the steam circulation system, the existing steam circulation system is not modified. Drying in the system pipeline can be performed.

In any of the above methods, if there is a possibility that the temperature of the water in the tank rises due to the recovery of the drain, and the suction capacity of the ejector is thereby lowered, the temperature lowering operation may be performed on the water in the tank. This prevents a decrease in the suction performance of the ejector.

As described above, according to the present invention, after the operation of the steam circulation system is stopped, the drain remaining in the path from the steam supply source to the water supply tank through the steam using device is almost completely discharged to the outside of the system. It is possible to provide a pipe drying device for a steam circulation system capable of drying the inside of the path and a pipe drying method in the steam supply system.

FIG. 1 is a schematic front view showing a steam circulation system drying apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view illustrating a state in which the steam drying system pipe drying device shown in FIG. 1 is attached to an existing steam circulation system, and shows a normal operation state of the steam circulation system. FIG. 3 is a schematic view illustrating a drying method in the steam circulation system shown in FIG. FIG. 4 is a schematic view showing another embodiment of a method for drying a pipe line in a steam circulation system. FIG. 5 is a schematic diagram for explaining a drying method in the steam circulation system shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view showing an embodiment of a pipeline drying apparatus for a steam circulation system according to the present invention. FIG. 2 is a schematic view illustrating a state in which the steam drying system pipe drying device shown in FIG. 1 is attached to an existing steam circulation system, and shows a normal operation state of the steam circulation system. FIG. 3 is a schematic view illustrating a drying method in the steam circulation system shown in FIG.

Prior to the description of the steam circulation system pipe drying apparatus according to the present invention, a steam circulation system to which the present apparatus is applied will be described with reference to FIG.

FIG. 2 exemplifies a system adopted in a general linen factory as an example of a steam circulation system. This steam circulation system is connected to a steam supply source 1 such as a boiler that converts water into steam, and this steam supply source 1 is connected to the steam supply line 2 to use steam supplied from the steam supply source 1.

Used equipment

3a, 3b, a water supply tank 4 for supplying water to the steam supply source 1, a water supply pump 5 for supplying water from the water supply tank 4 to the steam supply source 1, surplus steam discharged from the steam using equipment 3b and And a steam drain line 6 for returning the drain to the water supply tank 4.

Here, as the

steam using devices

3a and 3b, a plurality of washing machines 3a using hot water having a predetermined temperature by heat of steam, and hot air generated by heat obtained from steam through a heat exchanger And a plurality of dryers 3b for drying the laundry.

Numeral 7 in the figure indicates a strainer, and this strainer 7 is provided in front of the water supply pump 5 and removes foreign matters contained in water supplied from the water supply tank 4 to the water supply pump 5.

Numeral 4a in the figure indicates a ball tap, and this ball tap 4a detects the water level of the water supply tank 4. When the water level in the water supply tank 4 falls below the specified value, for example, tap water is injected into the water supply tank 4 via the water injection port 4b.

The reference numeral 4c in the figure indicates an exhaust pipe, and this exhaust pipe 4c exhausts the steam rising from the water in the water supply tank 4 heated by the steam drain circulating in the water supply tank 4 into the atmosphere.

Reference numeral 8 in the figure indicates an on-off valve. The on-off valve 8 opens and closes between the steam supply source 1 and the steam supply pipe 2 to supply and stop steam to the steam supply pipe 2. It is.

<Pipe dryer for steam circulation system>
Next, an embodiment of a steam circulation system pipe drying device (hereinafter also simply referred to as a drying device) will be described with reference to FIG.

This drying apparatus 10 is connected to the steam circulation system described above, and surplus steam and drain remaining in the path from the steam supply source 1 to the water supply tank 4 through the

steam using devices

3a and 3b, that is, the steam supply line 2 The excess steam remaining in the steam using equipment 3a and the surplus steam and drain remaining from the steam using equipment 3b to the steam drain line 6 are discharged out of the system and the inside of the path is dried.

Specifically, a storage tank 11 that stores water at room temperature, a circulation pump 12 that circulates the water in the storage tank 11 through a circulation pipe 13, and a circulation pump 12 that is pumped by the circulation pump 12. The ejector 14 uses the generated water as drive water, and the drain suction pipe 16 that includes the switching valve 15 and connects the drain suction port 14 b of the ejector 14 and the steam drain pipe 6.

The storage tank 11 is, for example, a square columnar tank having a water volume of about 250 liters. A ball tap 11a for supplying and stopping tap water according to the elevation of the water level is disposed on the upper portion of the storage tank 11, and the water level in the storage tank 11 is controlled by the ball tap 11a. In addition, the code | symbol 11b in a figure shows the water inlet of the said tap water. Further, a water receiving panel 11c is provided above the ball tap 11a, and an iron removing magnet 11d for adsorbing iron contained in the steam drain is installed on the water receiving panel 11c. On the other hand, a thermometer 11e is provided on the outer surface below the storage tank, and the water temperature in the storage tank 11 measured by the thermometer 11e is displayed on the outside. A thermistor 11f that measures the water temperature in the storage tank 11 is provided at the same level as the thermometer 11e. Information on the water temperature measured by the thermistor 11f is sent to the control unit 17 installed on the storage tank 11 through the wiring 11g. Based on the information on the water temperature sent from the thermistor 11f, the control unit 17 drains from the drain outlet not shown and tap water is supplied from the water inlet 11b when the water temperature exceeds the upper limit value. Control the drain outlet and tap water on-off valve. The control unit 17 also controls the start and stop of the circulation pump 12. The circulation pump 12 may be started and stopped manually by a switch provided in the control unit 17 or by a timer provided in the control unit 17. In addition, the code | symbol 11h in a figure shows the support stand of the storage tank 11. FIG.

The circulation pump 12 is, for example, a stainless steel spiral pump such as SUS304, and circulates water in the storage tank 11 via a circulation pipe 13.

The upstream end of the circulation pipe 13 is connected to the lower side surface of the storage tank 11, and the circulation pump 12 is disposed in the vicinity of the upstream end. The downstream side of the circulation pipe 13 is branched into two paths, one path being connected to the drive water port 14a of the ejector 14, and the other path being connected to any hot water utilization equipment or facility via the on-off valve 18. Yes.

In the ejector 14, the driving water pumped from the circulation pump 12 through the circulation pipe 13 is ejected at a high speed from the driving water port 14 a toward the diffuser 14 c, thereby passing through the drain suction pipe 16 connected to the drain suction port 14 b. Thus, the steam and drain in the pipeline of the steam circulation system are sucked and discharged together with the drive water from the diffuser 14c into the storage tank 11 through the downstream end of the circulation pipe 13. Since the structure, principle, and operation of the ejector 14 are conventionally known, detailed description thereof is omitted here.

The drain suction pipe 16 is connected to the drain suction port 14b of the ejector 14 and is provided with a switching valve 15 at the tip thereof. The drain suction pipe 16 is connected to the steam drain pipe line 6 of the steam circulation system via the switching valve 15. At the time of this connection, an appropriate place of the steam drain pipe line 6 of the steam circulation system is cut and separated, and a switching valve 15 is interposed at the cut and separated place. Further, the drain suction pipe 16 is provided with a side glass 19 so that the state in the pipe, that is, the suction state of the vapor and drain by the ejector 14 can be visually confirmed from the outside. Note that the switching valve 15 is not necessarily provided, and the drain suction pipe 16 may be connected to the steam drain pipe line 6 via, for example, a cheese joint. However, in that case, a check valve may be provided in the pipeline so that water in the pipeline from the connecting portion to the water supply tank 4 does not flow to the ejector 14 during the operation of the drying apparatus 10. At the same time, whether the drain suction pipe 16 is provided with two valves, a reverse valve and an open / close valve, so that excess steam and drain from the steam using device 3b do not flow to the ejector 14 during operation of the steam circulation system. Or it is good to provide only an on-off valve.

<Drying method of steam circulation system>
Next, a method of drying the steam circulation system having the above-described configuration using the steam circulation system pipeline drying apparatus 10 will be described with reference to FIGS.

As shown in FIG. 2, when the steam circulation system is normally operated, the on-off valve 8 between the steam supply source 1 and the steam supply pipe 2 is opened, and the switching valve 15 of the drying device 10 is turned on. The drain pipe 6 and the water supply tank 4 are switched so as to be connected.

Water is supplied from the water supply tank 4 to the steam supply source 1 by the water supply pump 5, and foreign substances in the water are filtered by the strainer 7 in the middle of the supply. In the steam supply source 1, water from the water supply tank 4 becomes steam and is sent to the steam supply pipe 2 through the on-off valve 8.

A part of the steam is supplied from the steam supply pipe 2 to the steam-using device (washing machine in this example) 3a via a plurality of branch pipes 2a connected to the upstream side of the steam supply pipe 2, where hot water is heated by the heat of the steam. Is produced and used for washing.

The remaining steam that has not been supplied to the steam-using device (washing machine) 3a is further sent to the downstream side of the steam supply pipe 2, and the second steam-using device (here, the dryer) is passed through the plurality of branch pipes 2b. The heat exchanger) 3b. At that time, the steam is transmitted to the surrounding air by the steam using device (heat exchanger) 3b to generate hot air and used for drying the laundry.

Most of the steam that has passed through the second steam-using device 3b becomes drain, and is recirculated to the water supply tank 4 through the switching valve 15 as steam drain. In the water supply tank 4, since the recirculated steam drain is at a high temperature, the upper water temperature rises and steam rises from the water surface. This steam is discharged to the atmosphere through the exhaust cylinder 4c. When a drop in the water level in the water supply tank 4 is detected by the ball tap 4a, tap water is injected through the water inlet 4b.

In this way, while the operation in the steam circulation system is continued, the steam circulation system pipe drying device 10 is in a stopped state.

After that, for example, when the end of work, the steam circulation system is stopped. At that time, the following procedure is executed, and drying of the pipeline including the

steam using devices

3a and 3b of the steam circulation system is started. Hereinafter, a description will be given with reference to FIG.

First, after the steam supply source 1 is stopped, the switching valve 15 of the drain suction pipe 16 of the drying apparatus 10 is switched to connect the drain suction port 14b of the ejector 14 and the steam drain pipe line 6 while the steam supply source 1 And the steam supply line 2 are cut off.

Subsequently, the circulating pump 12 of the drying device 10 is driven to pump the drive water to the ejector 14. This state is maintained for a predetermined time, and the ejector 14 continues to function. As a result, all of the steam and drain remaining in the steam supply pipe 2 and the steam drain pipe 6 of the steam circulation system and in the

steam using devices

3 a and 3 b are sucked by the ejector 14. Then, by continuously driving the ejector 14, the inside of the steam drain line 6, the

steam using devices

3 a and 3 b, and the inside of the steam supply pipe 2 approach a vacuum state in this order, and accordingly remain in these. The drain that has been evaporated evaporates, and eventually all of the inside of the steam drain pipe 6, the

steam using devices

3 a and 3 b, and the steam supply pipe 2 are dried. Whether or not the drying is completed can be determined by observing the inside of the pipe from the side glass 19 provided in the drain suction pipe 16. That is, when the drying is not completed, it is possible to see a state where the drain bubbles through the side glass 19. And when this state is not seen and it passes for a while, it can be judged that drying is completed. Since the steam circulation systems are different in scale, record how long the drying apparatus 10 should be dried once, and then set the time in the timer of the control unit 17. Thus, drying can be semi-automated. In addition, although the side glass 19 is provided near the ejector 14 of the drain suction pipe 16, the position thereof is not limited to the illustrated example. Moreover, the installation location of the side glass 19 is not restricted to one location. Further, a side glass 19 may be provided on both the drain suction pipe 16 and the steam drain pipe 6.

<Other embodiments>
In the above embodiment, the drying device 10 is connected to the steam circulation system. However, in the steam circulation system including the heat recovery device provided with the ejector, the heat recovery device is connected to the pipe circulation drying device for the steam circulation system. Even if the ejector is used, the pipeline can be dried. Hereinafter, this embodiment will be described with reference to FIGS. Note that components having the same functions and configurations as those of the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.

The heat recovery device in this steam circulation system has the same configuration as the above-described steam drying system pipe drying device 10, and also functions as a drying device. Hereinafter, it is referred to as a heat recovery device / drying device 10. The difference from the above embodiment is that the water in the storage tank 11 is supplied to the water supply pump 5 through the strainer 7 through the water supply port 11k provided at the bottom of the storage tank 11, and the storage tank. 11 is used as water for steam in the steam circulation system. Here, the downstream side of the circulation pipe 13 is branched into two paths, one path is connected to the drive water port 14a of the ejector 14, and the other path is connected to any hot water using equipment or facility via the on-off valve 18. It is connected to the.

FIG. 4 shows a state in which the steam circulation system is in operation, and the water in the storage tank 11 is sent to the water supply pump 5 through the strainer 7 through the water supply port 11k provided at the bottom of the storage tank 11.

Next, in order to dry the pipe of the steam circulation system, the steam supply source 1 is stopped, and the on / off valve 8 between the steam supply source 1 and the steam supply pipe 2 is shut off. The ejector 14 continues to function by driving the circulation pump 12 of the recovery / drying device 10 to circulate the water in the storage tank 11 through the circulation pipe 13.

Thereby, as in the above-described embodiment, the insides of all of the steam supply pipe 2, the

steam using devices

3 a and 3 b and the steam drain pipe 6 of the steam circulation system are dried.

Here, in this embodiment, since the high-temperature steam and drain are always circulated in the storage tank 11 during operation of the steam circulation system, the water temperature in the tank tends to be high (80 ° C. to 90 ° C.). . When the water temperature is high, the suction capacity of the ejector 14 tends to decrease. Therefore, when drying the pipeline, it is desirable to inject tap water into the storage tank 11 and lower the water temperature to 50 ° C. or lower prior to that. Thus, by lowering the water temperature in the storage tank 11, the suction ability of the ejector 14 is fully exhibited, and the pipe line of the steam circulation system is efficiently dried. Further, preferably, when the water temperature in the storage tank 11 is lowered to 20 ° C. to 30 ° C., the suction capability of the ejector 14 is enhanced and the drying can be completed in a shorter time.

In addition, you may perform the temperature fall operation of the water in such a storage tank 11 also in the said embodiment.

DESCRIPTION OF SYMBOLS 1 Steam supply source 2 Steam supply line 3a Steam use apparatus (washing machine)
3b Steam use equipment (dryer)
4 Water Supply Tank 5 Water Pump 6 Steam Drain Pipe Line 8 Open / Close Valve 10 Steam Circulation System Pipe Line Drying Device 11 Storage Tank 12 Circulation Pump 13 Circulation Pipe 14 Ejector 15 Switching Valve 16 Drain Suction Pipe

Claims

A steam supply source such as a boiler that converts water into steam, a steam using device that is connected to the steam supply source via a steam supply line and uses steam supplied from the steam supply source, and the steam supply source A water supply tank for supplying water, a water supply pump for supplying water from the water supply tank to the steam supply source, and a steam drain line for returning excess steam and drain discharged from the steam-using device to the water supply tank In the steam circulation system, a surplus steam and drain remaining in a path from the steam supply source through the steam using device to the water supply tank is discharged out of the system and dried in the path. And
A storage tank for storing room temperature water;
A circulation pump for circulating the water in the storage tank through a circulation pipe;
An ejector intervening in the circulation pipe and having water driven by the circulation pump as drive water;
A drying apparatus for a steam circulation system, comprising: a drain suction pipe connecting the drain suction port of the ejector and the steam drain pipe line.
A steam supply source such as a boiler that converts water into steam, a steam using device that is connected to the steam supply source via a steam supply line and uses steam supplied from the steam supply source, and the steam supply source A water supply tank for supplying water, a water supply pump for supplying water from the water supply tank to the steam supply source, and a steam drain line for returning excess steam and drain discharged from the steam-using device to the water supply tank In the steam circulation system,
The steam supply system of the steam circulation system is stopped while the steam circulation system drying apparatus according to claim 1 is connected to the steam drain pipe of the steam circulation system via the drain suction pipe, and then the steam While switching the drain suction pipe switching valve of the drying device for the circulation system to connect the drain suction port of the ejector and the steam drain pipe, the steam supply source and the steam supply pipe are shut off, and then the steam circulation is performed. The ejector continues to function by driving the circulation pump of the system drying device and pumping the drive water to the ejector, so that all of the steam supply line, the steam using equipment and the steam drain line of the steam circulation system A method for drying a pipe line in a steam circulation system, characterized in that the inside of the pipe line is dried.
A steam source;
A steam using device connected to the steam supply source via the steam supply pipe and using the steam supplied from the steam supply source;
While supplying water to the steam supply source, it is connected to the steam using equipment via a steam drain line, and is included in the drain condensed by the steam used by the steam using equipment and the steam used by the steam using equipment. The tank, a circulation pump that circulates the water stored in the tank through a circulation pipe, and the circulation pipe, and sucks the steam and drain, A heat recovery device and a drying device for a steam circulation system comprising an ejector that recovers the steam and drain by mixing with the water being circulated;
In the steam circulation system including
After shutting off the steam supply source and shutting off between the steam supply source and the steam using device, the circulation pump of the drying device for the heat recovery device / steam circulation system is driven to The ejector continues to function by circulating water through the circulation pipe, and thus the inside of all the steam supply pipes, steam-using equipment and steam drain pipes of the steam circulation system is dried. A method for drying a pipe line in a steam circulation system.
In the pipe line drying method in the steam circulation system according to claim 2,
A pipe line drying method in a steam circulation system, wherein when the inside of the pipe line is dried, a temperature lowering operation is performed on water in a water storage tank of the steam circulation system drying device.
In the pipe line drying method in the steam circulation system according to claim 3,
A pipe drying method in a steam circulation system, wherein when the inside of the pipe is dried, a temperature lowering operation is performed on water in a tank of the drying device for the heat recovery device and steam circulation system.