JP4870733B2 - Heat dissipation system using direct contact heat storage device and operation method thereof - Google Patents

Description

  The present invention relates to a heat dissipation system using a direct contact heat storage device capable of temporarily storing heat and an operation method thereof.

  Heat generated in factories and treatment plants such as steelworks and waste incineration facilities is used in various facilities near the factories and treatment plants. Further, by temporarily storing heat generated in a factory or processing plant in a heat storage device and transporting the heat storage device, it is possible to use heat even in a place away from the factory or processing plant. As a technique regarding this heat storage device, for example, there is one described in Patent Document 1 below.

  Conventionally, a technique relating to a heat storage method for storing heat from steam generated in a waste heat boiler of a waste incineration facility in a heat storage device has been proposed (see, for example, Patent Document 1). The heat storage method for this heat storage device is the heat generated from the waste heat recovery from the waste combustion exhaust gas in the waste heat boiler of the waste incineration facility and the heat from the storage container that stores the heat storage material (heat storage body). In this heat storage method, heat is supplied to the heat exchange medium by exchanging heat with the exchange medium, and heat is stored in the heat storage material by directly contacting the heat exchange medium and the heat storage material in the storage container.

  Then, the stored heat storage device is transported to a heat utilization facility such as a hospital, a school, or a hot water pool located away from the waste incineration facility, and heat is supplied to the heat utilization facility via a heat exchanger. Do it. On the heat utilization equipment side as well, heat exchange is performed by direct contact between the heat exchange medium and the heat storage material in the storage container. When the heat supply operation (heat radiation operation) on the heat utilization facility side is completed, the heat storage device is transported to a waste incineration facility that is a heat source facility, and heat is stored in the heat storage device again.

JP 2007-40695 A

  Here, in the heat storage device described in Patent Document 1, heat exchange is performed by direct contact between the heat storage material and the heat exchange medium in the storage container, so that the heat storage material flows out of the storage container together with the heat exchange medium. There are things to do. The outflow of the heat storage material becomes a problem during the heat supply operation (heat radiation operation) on the heat utilization facility side. When the heat dissipation operation ends, the temperature of the heat exchanger decreases. When the temperature of the heat exchanger decreases, the heat storage material present in the heat exchanger flowing out of the storage container is solidified. The solidified heat storage material narrows the flow path of the heat exchange medium in the heat exchanger, and as a result, it becomes difficult to flow the heat exchange medium at a constant flow rate. And the power for flowing the heat exchange medium at a constant flow rate increases.

  Therefore, at the start of the heat radiation operation, the flushing operation is performed every time in order to remove obstructions such as the heat storage material in the heat exchanger. The flushing operation is an operation in which a high-temperature heat exchange medium is allowed to flow through the heat exchanger to remove the blockage in the heat exchanger. Here, immediately after the flushing operation, the inside of the heat exchanger becomes a high temperature, and it has not been possible to immediately shift to the heat supply operation in which the fluid to be heated is supplied to the heat exchanger and heated. For example, since water boils in a high-temperature heat exchanger immediately after the flushing operation, it is necessary to cool the heat exchanger to some extent. That is, it took time to start supplying heat to the heat utilization facility. Moreover, the delay in the transition to the heat supply operation leads to a heat dissipation loss and the heat supply efficiency is deteriorated.

  The present invention has been made in view of the above circumstances, and its purpose is to allow a smooth transition from a flushing operation to a heat supply operation, and to sufficiently dissipate blockage in the heat exchanger. It is to provide a system and its operating method.

Means and effects for solving the problems

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have installed two heat exchangers for indirectly heating the fluid to be heated in parallel, for heat supply operation / flushing operation and for the two heat exchange operations. The present inventors have found that the above-mentioned problems can be solved by switching the devices to each other, and the present invention has been completed based on this finding.

  That is, in order to solve the above problems, the present invention provides a direct contact heat storage device that houses a heat storage material used for latent heat storage and a heat exchange medium that performs heat exchange by directly contacting the heat storage material, A heat medium circulation path that is connected to a direct contact heat storage device and in which the heat exchange medium circulates, and a first heat exchanger and a second heat that are provided in parallel in the heat medium circulation path and indirectly heat the fluid to be heated. An exchanger, and a heat medium circulation pump that is provided in the heat medium circulation path and circulates the heat exchange medium, and the first heat exchanger and the second heat exchanger are indirectly connected to the fluid to be heated. Provided is a heat dissipation system for heating operation for heating, for flashing operation for melting the heat storage material solidified in a heat exchanger and returning it to the direct contact type heat storage device, and for switching operation. .

  According to this configuration, since two heat exchangers for indirectly heating the fluid to be heated are provided in parallel in the heat medium circulation path, for example, at the start of the heat radiation operation, one of the first heat exchangers (or the second heat exchanger) is provided. After the flushing operation is completed, the fluid to be heated can be indirectly heated with the other second heat exchanger (or the first heat exchanger) to perform a heat supply operation. Therefore, when shifting from the flushing operation to the heat supply operation, it is possible to shift to the heat supply operation without using a heat exchanger that has become a high temperature immediately after the flushing operation. That is, it is possible to smoothly shift from the flushing operation to the heat supply operation. In addition, by operating two heat exchangers provided in parallel with each other for heat supply operation and flushing operation, blockage in the heat exchanger can be sufficiently suppressed.

  In the present invention, the heat medium circulation path on the upstream side of the first heat exchanger and the second heat exchanger, and the heat medium circulation path on the downstream side of the first heat exchanger and the second heat exchanger, And a bypass valve that is provided in the bypass path and switches the flow of the heat exchange medium from the direct contact heat storage device to the heat exchanger side or the bypass path side. It is preferable.

  According to this configuration, when shifting from the flushing operation to the heat supply operation (when changing the heat exchanger that flows the heat exchange medium), the heat medium circulation pump is temporarily turned on by flowing the heat exchange medium to the bypass path. No need to stop. That is, when shifting from the flushing operation to the heat supply operation, the heat medium circulation pump can be continuously operated without stopping and starting, and the flushing operation can be more smoothly shifted to the heat supply operation. .

  Moreover, according to the 2nd aspect, this invention provides the heat transport system provided with the thermal radiation system of this invention. According to this heat transport system, the heat supply to the heat utilization facility can be smoothly performed, and the blockage in the heat exchanger on the heat utilization facility side can be sufficiently suppressed.

  Furthermore, according to the third aspect of the present invention, a direct contact heat storage device that houses a heat storage material used for latent heat storage and a heat exchange medium that performs heat exchange by directly contacting the heat storage material, A heat medium circulation path that is connected to the direct contact heat storage device and through which the heat exchange medium circulates, and a first heat exchanger and a second heat exchanger that are provided in parallel in the heat medium circulation path and indirectly heat the fluid to be heated. An operation method of a heat dissipation system comprising a heat exchanger and a heat medium circulation pump provided in the heat medium circulation path and circulating the heat exchange medium, wherein the first heat exchanger and the second heat exchange The heat exchange medium is circulated between one of the heat exchangers and the direct contact heat storage device, and the heat storage material solidified in the heat exchanger is dissolved, and the direct contact type A flushing step for returning to the heat storage device; After the sing process, the heat exchange medium is circulated between the other heat exchanger of the first heat exchanger and the second heat exchanger and the direct contact heat storage device, and the heat exchanger A heat supply process for indirectly heating the fluid to be heated flowing therein, wherein the flushing process and the heat supply process are switched between the first heat exchanger and the second heat exchanger. Provide driving methods.

  According to this configuration, for example, one first heat exchanger (or second heat exchanger) is flushed, and after the flushing process is finished, the other second heat exchanger (or first heat exchanger) is heated. The fluid is indirectly heated to perform heat supply operation. Therefore, when shifting from the flushing process to the heat supply process, it is possible to shift to the heat supply process without using a heat exchanger that has become a high temperature immediately after the flushing process. That is, it is possible to smoothly shift from the flushing operation to the heat supply operation. Moreover, the blockage in the heat exchanger can be sufficiently suppressed by switching the flushing process and the heat supply process to two heat exchangers provided in parallel.

  Moreover, in this invention, it is preferable to provide the to-be-heated fluid discharge | emission process which extracts the to-be-heated fluid in the heat exchanger of flushing object before the said flushing process.

  According to this configuration, heat of the heat exchange medium is not taken by the heated fluid in the flushing process. That is, it is possible to prevent heat loss to the heated fluid. Moreover, since the temperature fall of the high temperature heat exchange medium which is a flushing medium can be prevented, more reliable flushing (clogging removal) can be performed.

  Furthermore, in the present invention, the heat dissipation system includes the heat medium circulation path upstream of the first heat exchanger and the second heat exchanger, and the downstream of the first heat exchanger and the second heat exchanger. A bypass path that communicates with the heat medium circulation path, and a bypass that is provided in the bypass path and switches the flow of the heat exchange medium from the direct contact heat storage device to the heat exchanger side or the bypass path side And a bypass valve switching step of temporarily switching the bypass valve to the bypass path side when shifting from the flushing step to the heat supply step.

  According to this configuration, when shifting from the flushing process to the heat supply process (when changing the heat exchanger that flows the heat exchange medium), the bypass valve is temporarily switched to the bypass path side to flow the heat exchange medium to the bypass path. Thus, it is not necessary to stop the heat medium circulation pump. That is, when shifting from the flushing operation to the heat supply operation, the heat medium circulation pump can be continuously operated without stopping and starting, and the flushing operation can be more smoothly shifted to the heat supply operation. .

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Here, first, a heat transport system using a direct contact heat storage device (hereinafter referred to as “heat storage device”) and a heat storage device will be described, and then a heat dissipation system using the heat storage device and an operation method thereof. explain.

(Heat transport system)
FIG. 1 is a schematic diagram for explaining a heat transport system. As shown in FIG. 1, this heat transport system uses, for example, exhaust heat generated in a heat source facility 100 such as a steel mill, a power plant, and a waste incineration facility, for example, a hospital, a school, a hot water pool, and a building heating facility. It is a system for transporting to the heat utilization equipment 200. First, the exhaust heat generated in the heat source facility 100 is stored in the heat storage device 1 mounted on the loading platform 3 of the transport vehicle 4 such as a truck, and the heat storage device 1 is transported to the heat utilization facility 200 (see FIG. 1A). Then, heat is supplied from the heat storage device 1 to the heat utilization facility 200, and after the heat supply is completed, the heat storage device 1 is transported to the heat source facility 100 (see FIG. 1B). As described above, the heat storage device 1 is repeatedly mounted between the heat source facility 100 and the heat utilization facility 200 as necessary while being mounted on the loading platform 3 of the transport vehicle 4. Note that, among the arrows in FIG. 1, a dotted arrow indicates the moving direction of the transport vehicle 4, and a solid arrow indicates the heat moving direction. This heat transport system includes a heat dissipation system 50 described later, and the heat dissipation system 50 is located on the heat utilization facility 200 side.

(Heat storage device)
Next, an outline of the heat storage device will be described. FIG. 2 is a schematic diagram showing the heat storage device 1. As shown in FIG. 2, the heat storage device 1 includes a heat storage material 12 used for latent heat storage, a storage container 11 that houses the heat storage material 12, and a heat exchange medium 13 that has a smaller specific gravity than the heat storage material 12. 11 is provided with a supply pipe 14 for supplying from the outside of the storage container 11 to the inside of the storage container 11 and a discharge pipe 15 for discharging the heat exchange medium 13 supplied to the inside of the storage container 11 to the outside of the storage container 11. Yes.

  As the heat storage material 12, it is preferable to employ a substance that has a large latent heat (heat of fusion) and becomes solid at room temperature, and examples of such a substance include erythritol. Erythritol is a substance having a freezing point: about 119 ° C. and a heat of fusion: about 340 kJ / kg, and is solid at room temperature. In the following description, it is assumed that erythritol is adopted as the heat storage material 12 unless otherwise specified. Moreover, it is preferable to employ | adopt the substance which can maintain the state isolate | separated completely from the thermal storage material 12 as the heat exchange medium 13, and mineral oil is mentioned as such a substance, for example. In the following description, mineral oil is used as the heat exchange medium 13 unless otherwise specified.

  The heat exchange medium 13 heated by exhaust heat from the heat source equipment 100 (or radiated to the heat utilization equipment 200) is supplied from the supply rod 14 shown in FIG. 2 into the heat storage material 12 accommodated in the storage container 11. The heat storage material 12 is supplied and brought into direct contact with the heat storage material 12 to rise (float) due to the difference in specific gravity between the heat storage material 12 and the heat exchange medium 13. The heat exchange medium 13 reaches the layer of the heat exchange medium 13 formed above the heat storage material 12. The heat exchange medium 13 that has reached the layer of the heat exchange medium 13 and radiated (received heat) is heated from the exhaust heat of the heat source equipment 100 (or radiated to the heat utilization equipment 200) from the discharge pipe 15. It is discharged outside.

(Heat dissipation system)
Next, the heat dissipation system will be described. FIG. 3 is a block diagram showing a heat dissipation system 50 using the heat storage device 1. As described above, the exhaust heat generated in the heat source facility 100 is stored in the heat storage device 1 (heat storage device formed so as to be transportable), and the heat storage device 1 is transported to the heat utilization facility 200. Then, heat is supplied from the heat storage device 1 to the heat utilization facility 200 by the heat dissipation system 50. Thus, the heat dissipation system 50 shown in the present embodiment is one system in the heat transport system. The heat dissipation system of the present invention can also be used as a system for supplying heat to the heat utilization equipment 200 from a fixed contact (permanently installed) direct contact heat storage device.

  As shown in FIG. 3, the heat dissipation system 50 is provided in parallel in the heat storage device 1, the heat medium circulation path 6 that is connected to the heat storage apparatus 1 and in which the heat exchange medium 13 circulates, and the heat medium circulation path 6. The first heat exchanger 21 and the second heat exchanger 22, and the heat medium circulation pump 5 provided in the heat medium circulation path 6 to circulate the heat exchange medium 13 are provided.

(Heating medium circulation route)
The heat medium circulation path 6 is connected to the heat storage device 1 via the flexible hose 2. The flexible hose 2 is convenient for attaching to and detaching from the heat medium circulation path 6 in a state where the heat storage device 1 is mounted on the transport vehicle 4. The heat medium circulation path 6 includes the heat medium circulation path 6a on the upstream side of the first heat exchanger 21 and the second heat exchanger 22, and the heat on the downstream side of the first heat exchanger 21 and the second heat exchanger 22. It can be grasped separately from the medium circulation path 6b. The upstream heat medium circulation path 6 a and the downstream heat medium circulation path 6 b are connected by a bypass path 7.

  A bypass valve 23 for switching the flow of the heat exchange medium 13 from the heat storage device 1 to the heat exchangers 21 and 22 side or the bypass path 7 side is attached to the bypass path 7. The bypass valve 23 is attached to the intersection of the upstream heat medium circulation path 6 a and the bypass path 7. The bypass valve 23 is an electric three-way valve, and is a valve that can be arbitrarily adjusted in opening degree.

  Further, a switching valve that switches the flow of the heat exchange medium 13 from the heat storage device 1 to the first heat exchanger 21 side or the second heat exchanger 22 side in the heat medium circulation path 6a downstream of the bypass valve 23. 24 is attached. The heat medium circulation path 6a branches to the first heat exchanger 21 side and the second heat exchanger 22 side with the switching valve 24 as a branching portion. The switching valve 24 is an electric three-way valve and is a two-position control valve that is fully open and fully closed.

(First and second heat exchanger)
The first heat exchanger 21 and the second heat exchanger 22 are indirect heat exchangers that indirectly heat a fluid to be heated (for example, water). Examples of the indirect heat exchanger include a multi-tubular cylindrical heat exchanger, a double pipe heat exchanger, and a plate heat exchanger. The first heat exchanger 21 and the second heat exchanger 22 are connected to fluid circulation paths 8 through which the heated fluid circulates. Further, a valve 26 and a valve 28 are respectively attached to the fluid circulation paths 8 on the inlet side of the first heat exchanger 21 and the second heat exchanger 22, and the valves 25 and 28 are respectively connected to the fluid circulation path 8 on the outlet side. A valve 27 is attached. Although the valves 25 to 28 of the present embodiment are manual valves, they may be electric valves. A drain valve 29 is attached to the fluid circulation path 8 between the first heat exchanger 21 and the valve 26. Similarly, a drain valve 30 is also attached to the fluid circulation path 8 between the second heat exchanger 22 and the valve 28. The drain valves 29 and 30 of the present embodiment are manual valves, but may be electric valves.

(Heat medium circulation pump)
The heat medium circulation pump 5 is provided in the heat medium circulation path 6 between the heat storage device 1 and the bypass valve 23. This heat medium circulation pump 5 is a pump with a constant rotational speed that only performs start / stop control. It is not always necessary to use a pump with a constant rotational speed, and there is no problem even if it is a variable rotational speed pump.

(How to operate the heat dissipation system)
First, an outline of a mechanism for supplying heat from the heat storage device 1 to the heat utilization facility 200 will be described. The high-temperature heat exchange medium 13 of the heat storage device 1 is operated to the first heat exchanger 21 (or the second heat exchanger 22) via the heat medium circulation path 6a by operating the heat medium circulation pump 5. Reach. On the other hand, the low-temperature heated fluid from the heat utilization facility 200 reaches the first heat exchanger 21 (or the second heat exchanger 22) via the fluid circulation path 8. Then, heat is transferred from the high-temperature heat exchange medium 13 to the low-temperature heated fluid in the first heat exchanger 21 (or the second heat exchanger 22), and the heated heated fluid passes through the fluid circulation path 8. Return to the heat utilization facility 200 via. The heat exchange medium 13 that has dissipated heat returns to the heat storage device 1 via the heat medium circulation path 6b and receives heat from the heat storage material 12 by directly contacting the heat storage material 12 again.

  Here, due to the flow of the heat exchange medium 13 returning to the heat storage device 1 and rising in the heat storage material 12, the layer of the heat storage material 12 in the storage container 11 that has changed to a liquid is stirred, and its discharge pipe The heat storage material 12 may be mixed in the heat exchange medium 13 flowing through the inside 15 (the heat storage material 12 may flow out). The heat storage material 12 that has flowed out enters the first heat exchanger 21 (or the second heat exchanger 22) via the heat medium circulation path 6a. When the temperature in the first heat exchanger 21 (or the second heat exchanger 22) falls below the freezing point of the heat storage material 12, the heat storage in the first heat exchanger 21 (or the second heat exchanger 22). The material 12 solidifies. The solidified heat storage material 12 narrows the flow path of the heat exchange medium 13 in the first heat exchanger 21 (or the second heat exchanger 22), and as a result, it is difficult to flow the heat exchange medium 13 at a constant flow rate. It becomes. Then, the power of the heat medium circulation pump 5 increases in order to flow the heat exchange medium 13 at a constant flow rate. . Therefore, at the start of the heat radiation operation, the flushing operation is performed every time in order to remove obstructions such as the heat storage material 12 in the heat exchanger.

  Next, an operation method of the heat dissipation system 50 will be described. In the following description, first, the case where the inside of the second heat exchanger 22 is flushed will be described.

(First heat exchanger 21: heat supply operation, second heat exchanger 22: flushing operation)
In starting the operation of the heat dissipation system 50, first, the valves 27 and 28 provided in the fluid circulation path 8 before and after the second heat exchanger 22 are closed, and the drain valve 30 is opened, so that the inside of the second heat exchanger 22 The heated fluid is extracted (heated fluid discharge step). In addition, it is confirmed that the valves 25 and 26 before and after the first heat exchanger 21 are open. In the heated fluid discharge step, only the heated fluid between the valve 27 and the valve 28 is discharged. By extracting the heated fluid in the second heat exchanger 22, the heat of the heat exchange medium 13 is not taken by the heated fluid in the flushing process described later. That is, it is possible to prevent heat loss to the heated fluid. Moreover, since the temperature drop of the high-temperature heat exchange medium 13 that is a flushing medium can be prevented, more reliable flushing (clogging removal) can be performed.

  Next, after confirming that the bypass valve 23 is open on the bypass path 7 side, the heat medium circulation pump 5 is started. Thereby, the heat exchange medium 13 from the heat storage device 1 does not flow to the heat exchangers 21 and 22 side, flows through the bypass path 7 and returns to the heat storage device 1.

  Next, the switching valve 24 is switched to the second heat exchanger 22 side (confirms that the switching valve 24 is on the second heat exchanger 22 side: open). And the bypass valve 23 is switched to the heat exchangers 21 and 22 side. Thereby, the high-temperature heat exchange medium 13 (temperature is, for example, 140 ° C. to 160 ° C.) circulates between the second heat exchanger 22 and the heat storage device 1 and is solidified in the second heat exchanger 22. The heat storage material 12 is dissolved in the heat exchange medium 13 and returned into the heat storage device 1 (flushing step). The flushing of the second heat exchanger 22 is performed for about 1 to 5 minutes.

  Thereafter, the bypass valve 23 is switched to the bypass path 7 side (bypass valve switching step). In this way, when shifting from the flushing process to the heat supply process described later, the heat medium circulation pump 5 is stopped by switching the bypass valve 23 to the bypass path 7 side and flowing the heat exchange medium 13 to the bypass path 7. There is no need to let them. That is, when shifting from the flushing operation to the heat supply operation, the heat medium circulation pump 5 can be continuously operated at a constant rotation without stopping and starting, and the transition from the flushing operation to the heat supply operation can be performed more smoothly. it can.

  Next, the switching valve 24 is switched to the first heat exchanger 21 side. And the bypass valve 23 is switched to the heat exchangers 21 and 22 side. As a result, the heat exchange medium 13 circulates between the first heat exchanger 21 and the heat storage device 1, and the fluid to be heated that flows in the first heat exchanger 21 from the heat utilization facility 200 via the fluid circulation path 8. Is indirectly heated (heat supply step). For example, water to be heated is heated to, for example, 60 ° C. to 90 ° C.

  When the heat supply from the heat storage device 1 to the heat utilization facility 200 is completed, the bypass valve 23 is switched to the bypass path 7 side, and then the heat medium circulation pump 5 is stopped. Further, the valves 27 and 28 before and after the second heat exchanger 22 are opened to fill the second heat exchanger 22 with hot water. The drain valve 30 is closed.

  According to this operation method, the first heat exchanger 21 is flushed, and after the flushing is finished, the fluid to be heated is indirectly heated by the second heat exchanger 22, which is a heat exchanger different from the first heat exchanger 21. The heat supply operation will be performed. Therefore, when shifting from the flushing operation to the heat supply operation, it is possible to shift to the heat supply operation without using the first heat exchanger 21 that has become a high temperature immediately after the flushing operation. That is, it is possible to smoothly shift from the flushing operation to the heat supply operation without time loss.

(First heat exchanger 21: flushing operation, second heat exchanger 22: heat supply operation)
In the next heat supply from the heat storage device 1 to the heat utilization facility 200, the inside of the first heat exchanger 21 used for the heat supply to the previous heat utilization facility 200 is flushed, and the second heat exchanger that was flushed last time At 22, heat is supplied to the heat utilization equipment 200.

  First, the valves 25 and 26 provided in the fluid circulation path 8 before and after the first heat exchanger 21 are closed, and the drain valve 29 is opened to remove the heated fluid in the first heat exchanger 21 (heated). Fluid discharge process). It should be noted that the valves 27 and 28 before and after the second heat exchanger 22 are opened.

  Next, after confirming that the bypass valve 23 is open on the bypass path 7 side, the heat medium circulation pump 5 is started. Thereby, the heat exchange medium 13 from the heat storage device 1 does not flow to the heat exchangers 21 and 22 side, flows through the bypass path 7 and returns to the heat storage device 1.

  Next, it is confirmed that the switching valve 24 is on the first heat exchanger 21 side: open. And the bypass valve 23 is switched to the heat exchangers 21 and 22 side. Thereby, the high-temperature heat exchange medium 13 (temperature is, for example, 140 ° C. to 160 ° C.) circulates between the first heat exchanger 21 and the heat storage device 1 and is solidified in the first heat exchanger 21. The heat storage material 12 is dissolved in the heat exchange medium 13 and returned into the heat storage device 1 (flushing step). The flushing of the first heat exchanger 21 is performed for about 1 to 5 minutes in the same manner as the flushing of the second heat exchanger 22.

  Thereafter, the bypass valve 23 is switched to the bypass path 7 side (bypass valve switching step). Next, the switching valve 24 is switched to the second heat exchanger 22 side. And the bypass valve 23 is switched to the heat exchangers 21 and 22 side. Thereby, the heat exchange medium 13 circulates between the second heat exchanger 22 and the heat storage device 1, and the fluid to be heated that flows in the second heat exchanger 22 from the heat utilization facility 200 via the fluid circulation path 8. Is indirectly heated (heat supply step).

  When the heat supply from the heat storage device 1 to the heat utilization facility 200 is completed, the bypass valve 23 is switched to the bypass path 7 side, and then the heat medium circulation pump 5 is stopped. Further, the valves 25 and 26 before and after the first heat exchanger 21 are opened to fill the first heat exchanger 21 with hot water. The drain valve 29 is closed.

  Thus, the heat dissipation system 50 dissolves the heat storage material 12 solidified in the heat exchanger for the heat supply operation for indirectly heating the fluid to be heated, for the first heat exchanger 21 and the second heat exchanger 22. This is a system that is operated by switching between the flushing operation and returning to the heat storage device 1 alternately for each heat radiation operation. For the heat exchangers 21 and 22 provided with two flushing steps and two heat supply steps in parallel, the heat exchangers 21 and 22 are sufficiently suppressed from being blocked by switching alternately for each heat radiation operation. Can do. In addition, it is not always necessary to alternately perform the flushing step and the heat supply step for each heat radiation operation with respect to the heat exchangers 21 and 22, and after performing the flushing operation of one heat exchanger a predetermined number of times, the other heat exchanger The flushing operation may be performed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

  For example, three or more heat exchangers for indirectly heating the fluid to be heated may be provided in parallel, and the switching operation may be performed mutually.

  In the above-described embodiment, an example in which the bypass valve 23 and the switching valve 24 are three-way valves has been described. However, the bypass valve 23 (or the switching valve 24) may be configured using two normal two-way valves. Good.

It is a schematic diagram for demonstrating a heat transport system. It is a schematic diagram which shows a direct contact type heat storage apparatus. It is a block diagram showing a heat dissipation system using a direct contact heat storage device.

Explanation of symbols

1: Thermal storage device (direct contact thermal storage device)
5: Heat medium circulation pump 6: Heat medium circulation path 12: Heat storage material 13: Heat exchange medium 21: First heat exchanger 22: Second heat exchanger 50: Heat dissipation system

Claims (6)

A direct contact heat storage device that houses a heat storage material used for latent heat storage and a heat exchange medium that performs heat exchange by directly contacting the heat storage material;
A heat medium circulation path connected to the direct contact heat storage device and through which the heat exchange medium circulates;
A first heat exchanger and a second heat exchanger that are provided in parallel in the heat medium circulation path and indirectly heat the fluid to be heated;
A heat medium circulation pump provided in the heat medium circulation path for circulating the heat exchange medium,
The first heat exchanger and the second heat exchanger are for heat supply operation for indirectly heating the fluid to be heated, and the heat storage material solidified in the heat exchanger is dissolved in the direct contact heat storage device. A heat dissipation system that operates by switching between flushing operation and returning to the other. Communicating between the heat medium circulation path upstream of the first heat exchanger and the second heat exchanger and the heat medium circulation path downstream of the first heat exchanger and the second heat exchanger A bypass path,
A bypass valve provided in the bypass path, for switching the flow of the heat exchange medium from the direct contact heat storage device to a heat exchanger side or the bypass path side;
The heat dissipation system according to claim 1, comprising:   A heat transport system comprising the heat dissipation system according to claim 1. A direct contact heat storage device that houses a heat storage material used for latent heat storage and a heat exchange medium that performs heat exchange by directly contacting the heat storage material;
A heat medium circulation path connected to the direct contact heat storage device and through which the heat exchange medium circulates;
A first heat exchanger and a second heat exchanger that are provided in parallel in the heat medium circulation path and indirectly heat the fluid to be heated;
A heat medium circulation pump that is provided in the heat medium circulation path and circulates the heat exchange medium;
The heat exchange medium is circulated between one of the first heat exchanger and the second heat exchanger and the direct contact heat storage device, and solidified in the heat exchanger. A flushing step of melting the heat storage material and returning it into the direct contact heat storage device;
After the flushing step, the heat exchange medium is circulated between the other heat exchanger of the first heat exchanger and the second heat exchanger and the direct contact heat storage device, and the heat exchange is performed. A heat supply process for indirectly heating the fluid to be heated flowing in the vessel,
An operation method of a heat dissipation system, wherein the flushing step and the heat supply step are performed by switching between the first heat exchanger and the second heat exchanger.   The operating method of the heat radiating system according to claim 4, further comprising a heated fluid discharge step of extracting the heated fluid in the heat exchanger to be flushed before the flushing step. The heat dissipation system is
Communicating between the heat medium circulation path upstream of the first heat exchanger and the second heat exchanger and the heat medium circulation path downstream of the first heat exchanger and the second heat exchanger A bypass path,
A bypass valve that is provided in the bypass path and switches the flow of the heat exchange medium from the direct contact heat storage device to a heat exchanger side or the bypass path side;
The operating method of the heat radiating system according to claim 4 or 5, further comprising a bypass valve switching step of temporarily switching the bypass valve to the bypass path side when shifting from the flushing step to the heat supply step.

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