JP6086807B2 - Cooling equipment - Google Patents

Description

  The present invention relates to a cooling facility that cools a heat source using cooling water, and more particularly to a cooling facility that cools a molten metal heating coil of a casting facility.

  The production process of industrial products such as automobiles includes a mold casting process in which molten metal (molten metal) is poured into a mold for casting. In the mold casting process, the steel sheet is cast using the casting equipment. It is supposed to be used and cooled.

  The cooling equipment of such casting equipment has been devised to reliably cool the heat source even in an emergency for safety management, and in Patent Document 1, the supply of cooling water from the water source was stopped by an emergency situation. Even so, there is disclosed a cooling water supply system capable of continuing the supply of cooling water for a certain period of time.

JP-A-8-338648

  By the way, the cooling of the casting equipment requires the cooling water to be pumped and supplied with a pump or the like, and there is room for further improvement. That is, in the cooling water supply system of Patent Document 1, the cooling water stored in the cooling water source is directly supplied to the heat exchange unit, and there is a problem that a large pump is required depending on the nature of the heat source. Moreover, in the cooling water supply system of patent document 1, it was set as the structure which provides a cooling tower (cooling tower) in a cooling water source, and there existed a problem that the electric power for driving | operating a cooling tower was needed.

This point will be specifically described with reference to FIG. FIG. 7 is a diagram showing a configuration of a conventional cooling facility 1A. The cooling facility 1 </ b> A is a cooling facility that cools the heat source 50 using the cooling water stored in the cooling water tank 2.
The cooling water tank 2 is supplied with cooling water as needed from the cooling water generating facility 100 while returning the cooling water heat-exchanged by the heat source 50. In addition, the cooling water production | generation equipment 100 is equipment which produces | generates the cooling water (for example, cooling water for air conditioning of a building, etc.) used for the whole plant. The cooling water tank 2 is provided with pumps 4, 5 and 6, and the cooling water whose pressure has been increased by the pumps 4, 5 and 6 is supplied to the heat source 50. When the heat source 50 is a casting facility, the cooling water is pressurized to 0.5 MPa by the pumps 4, 5 and 6.
The cooling water tank 2 is provided with a cooling tower 3 so that the cooling water heat-exchanged by the heat source 50 is cooled again.

  In such a conventional cooling facility 1A, the cooling water is directly supplied from the cooling water tank 2 to the heat source 50, and the pumps 4, 5, and 6 tend to be large. In addition, despite the supply of cooling water from the cooling water generation facility 100, a cooling tower unique to the cooling facility 1A is provided, which may lead to unnecessary power consumption.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a cooling facility capable of supplying cooling water to a heat source with power saving while enabling supply of cooling water in an emergency. And

(1) Cooling water pumped at a first pressure (for example, 0.2 MPa, which will be described later) from a cooling water generation facility (for example, a cooling water generating facility 100, which will be described later) to a heat source (for example, a heat source 50 which will be described later). A cooling facility that circulates and cools (for example, a cooling facility 1 described later), and branches from a main cooling water circulation channel (for example, a main cooling water circulation channel 106 described later) that circulates cooling water from the cooling water generation facility. A branch water channel (for example, a branch water channel 11 described later) for circulating cooling water to a heat source, and the cooling water at the first pressure is increased to a second pressure (for example, 0.5 MPa described later). A first pump (for example, a quadruple pump 12 described later) for supplying cooling water to the heat source, and a first return water channel (for example, described later) for returning the cooling water after heat exchange with the heat source to the main cooling water circulation channel. No. 1 return channel 4), an emergency tank (for example, an emergency tank 15 described later) that is disposed in the first return water channel and temporarily stores the cooling water after the heat exchange, and the cooling in the emergency tank. A second pump (for example, a return pump 16 described later) for returning water to the main cooling water circulation channel, and a first bypass channel (for example, bypassing the first pump during pre-cooling of the heat source and supplying cooling water to the heat source (for example, A first bypass water channel 21), which will be described later, and one end side are connected to the first return water channel and the other end side are connected to the cooling water generating facility, and when the heat source is precooled, the emergency tank is bypassed and heat is exchanged with the heat source. The second bypass water channel (for example, the second bypass water channel 22 described later) for returning the cooled water after the operation to the main cooling water circulation water channel, and the cooling water in the emergency tank to the first pressure at the time of abnormal stop. Rises and emergency pump is supplied to the heat source (e.g., emergency pump 32 which will be described later) and, in the normal cooling of the heat source is operating to the heat source, it is during the operation stop of the heat source when pre-cooling time and abnormal stop A cooling facility comprising a switching valve (for example, a switching valve 41, 42, 43, 44 described later) for switching each water channel.

  According to the cooling facility of (1), for supplying the cooling water to the heat source, it is necessary to pump the cooling water at the second pressure, but the cooling water pumped at the first pressure from the cooling water generating facility 100 is used. Since the pressure is further increased by the first pump, the first pump can be reduced in size. Moreover, since it is set as the structure which circulates the cooling water produced | generated with the cooling water production | generation equipment and cools a heat source, it is not necessary to provide a cooling tower in cooling equipment itself, and can suppress power consumption. On the other hand, at the time of an abnormal stop such as when there is an abnormality in the cooling water generation facility, the cooling water stored in the emergency tank is supplied to the heat source using the emergency pump, so it can be operated safely even in an emergency. . Therefore, according to the cooling facility of (1), it is possible to supply the cooling water to the heat source with power saving while enabling the supply of the cooling water in an emergency.

  (2) The cooling facility according to (1), wherein the heat source is a molten metal heating coil of a melting furnace.

  According to the cooling equipment of (2), the molten metal heating coil of the melting furnace can be appropriately cooled.

  According to the present invention, it is possible to supply cooling water to a heat source with power saving while enabling supply of cooling water in an emergency.

It is a figure which shows the structure of the cooling water production | generation equipment which supplies cooling water to the cooling equipment of this invention. It is a figure which shows the structure of the cooling equipment of this invention. It is a figure which shows the operation | movement at the time of normal driving | operation of the cooling equipment of this invention. It is a figure which shows the operation | movement at the time of the pre-cooling driving | operation of the cooling facility of this invention. It is a figure which shows the operation | movement at the time of the abnormal operation of the cooling facility of this invention. It is a figure which shows the comparison of the power consumption of the cooling equipment of this invention, and the conventional cooling equipment. It is a figure which shows the structure of the conventional cooling equipment.

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

[Configuration of Cooling Water Generation Facility 100]
FIG. 1 is a diagram showing a configuration of a cooling water generation facility 100 that supplies cooling water to the cooling facility 1 of the present invention. The cooling water generating facility 100 is a cooling water used in the entire plant, that is, a cooling water used for air conditioning in the supply facilities 111, 112, and a cooling water used for cooling a heat source (a cooling water supplied to the cooling facility 1). Generate.
The cooling water generation facility 100 includes a main tank 101, a pump 102, a first header 103, a cooling tower (cooling tower) 104, and a second header 105.

  The main tank 101 is a large (1270 t) tank for storing cooling water, and the cooling water used in the supply facilities 111 and 112 and the cooling facility 1 is returned and stored. The pump 102 is a pump that increases the pressure of the cooling water stored in the main tank 101 and pumps it. The pump 102 increases the pressure of the cooling water stored in the main tank 101 to about 0.2 MPa (first pressure), and supplies equipment 111 and 112. Or pumped toward the cooling facility 1. More specifically, the cooling water increased in pressure by the pump 102 is supplied to the cooling tower 104 via the first header 103 and cooled. The cooling water cooled by the cooling tower 104 is supplied to the supply facilities 111 and 112 and the cooling facility 1 via the second header 105.

The water channel connecting the second header 105 and the supply facilities 111 and 112 is called a main cooling water circulation channel 106, and the water channel connecting the second header 105 and the cooling facility 1 is called a branch water channel 11. In this way, the pump 102 pumps the cooling water stored in the main tank 101 to the supply facilities 111 and 112 and the cooling facility 1 (the main cooling water circulation water channel 106 and the branch water channel 11) at 0.2 MPa.
The supply facilities 111 and 112 are, for example, buildings in the plant, and the cooling water supplied from the cooling water generation facility 100 is used for facility air conditioning in the building.

[Configuration of cooling facility 1]
Then, with reference to FIG. 2, the structure of the cooling equipment 1 of this invention is demonstrated. The cooling facility 1 cools the heat source 50 using the cooling water supplied from the cooling water generation facility 100. Here, the heat source 50 is, for example, a molten metal heating coil of a melting furnace or a mold of a casting machine in a casting facility.

Cooling water is supplied to the cooling facility 1 from the cooling water generation facility 100 via the branch water channel 11. A four-pump 12 as a first pump is disposed in the branch water channel 11, and the cooling water supplied from the cooling water generating facility 100 is about 0.2 MPa to 0.5 MPa (second pressure) by the four-pump 12. The pressure is increased. The quadruple pump 12 is a parallel quadruple booster pump, and is controlled in parallel by a control device 60 described later based on the amount and pressure of cooling water supplied to the heat source 50. The cooling water increased in pressure by the quadruple pump 12 is supplied to the heat source 50 via the normal supply water passage 13.
The cooling water heat-exchanged by the heat source 50 is returned to the main cooling water circulation channel 106 via the first return channel 14. The first return water channel 14 is connected to the emergency tank 15, and the heat-exchanged cooling water is temporarily stored in the emergency tank 15. The emergency tank 15 is a small (12t) tank that does not have its own cooling tower, and is provided with a return pump 16 as a second pump. The cooling water stored in the emergency tank 15 is supplied to the first return water passage 14 by the return pump 16 and returned to the main cooling water circulation water passage 106.

Further, the cooling facility 1 is provided with a first bypass water channel 21 that bypasses the quadruple pump 12 and supplies cooling water to the heat source 50. The bypass of the quadruple pump 12 is performed by opening and closing the switching valves 41 and 42 provided in the branch water channel 11. That is, when the switching valve 41 is open and the switching valve 42 is closed, the cooling water in the branch water channel 11 is supplied to the quadruple pump 12, and when the switching valve 41 is closed and the switching valve 42 is open. The cooling water of the branch water channel 11 is supplied to the first bypass water channel 21.
Further, the cooling facility 1 is provided with a second bypass water channel 22 that bypasses the emergency tank 15 and returns the cooling water after heat exchange with the heat source 50 to the main cooling water circulation water channel 106. The bypass of the emergency tank 15 is performed by opening and closing the switching valves 43 and 44 provided in the first return water passage 14. That is, when the switching valve 43 is open and the switching valve 44 is closed, the cooling water in the first return water passage 14 is supplied to the emergency tank 15, and the switching valve 43 is closed and the switching valve 44 is open. The cooling water in the first return water passage 14 is supplied to the second bypass water passage 22 and returned to the main cooling water circulation water passage 106.

  In addition, the cooling facility 1 is provided with an emergency supply water channel 31 that supplies the cooling water in the emergency tank 15 to the heat source 50. The emergency supply water channel 31 is provided with an emergency pump 32 for increasing the pressure of the cooling water in the emergency tank 15 to about 0.2 MPa and pumping it to the heat source 50. The emergency pump 32 is provided with a generator, and can be uniquely driven when the cooling facility 1 or the cooling water generating facility 100 is stopped due to a power failure or the like.

  The cooling facility 1 is provided with a control device 60. The control device 60 is communicably connected to various pumps, switching valves, and the like, and controls the various pumps, switching valves, and the like. The control device 60 is an uninterruptible power supply device, and can control various pumps and switching valves in a certain time after a power failure.

  Then, operation | movement of the cooling equipment 1 of this invention is demonstrated.

[Normal operation during casting equipment operation]
FIG. 3 is a diagram illustrating a normal operation of the cooling facility 1 when the casting facility as the heat source 50 is in operation. In order to cool the casting equipment in operation, a lot of cooling water is required. In this embodiment, the cooling water is increased to 0.5 MPa and pumped.

  The cooling water generated by the cooling water generation facility 100 is supplied to the cooling facility 1 via the branch water channel 11. During the normal operation, the switching valves 41 and 42 provided in the branch water channel 11 are opened and the switching valve 42 is closed under the control of the control device 60. Therefore, the cooling water is supplied to the quadruple pump 12 through the branch water passage 11, is increased in pressure by the quadruple pump 12, and is supplied to the normal supply water passage 13. A flow rate sensor and a pressure sensor are arranged in the normal supply channel 13, and the control device 60 drives the four-pump 12 based on the monitoring results of these sensors (that is, the number of pumps to be driven and the number of pump rotations). ) Is controlled, the amount and pressure of the cooling water supplied to the heat source 50 are controlled. As a result, the cooling water supplied from the cooling water generation facility 100 is increased in pressure from 0.2 MPa to 0.5 MPa and supplied to the heat source 50.

  The cooling water heat-exchanged by the heat source 50 is returned to the cooling water generation facility 100 through the first return water channel 14. At this time, during normal operation, the heat exchanged cooling water is once returned to the emergency tank 15, so that the switching valves 43 and 44 provided in the first return water passage 14 are controlled by the control device 60. Is opened, and the switching valve 44 is closed. The amount of cooling water returned to the emergency tank 15 is monitored by the water level sensor and the control device 60, and when the amount of water in the tank exceeds a certain amount, the control device 60 drives the return pump 16 so that the inside of the tank The cooling water is returned to the cooling water generation facility 100. That is, during normal operation, a certain amount of cooling water is stored in the emergency tank 15.

[Pre-cooling operation when the casting equipment is stopped]
FIG. 4 is a diagram illustrating a pre-cooling operation of the cooling facility 1 when the casting facility serving as the heat source 50 is stopped. When the casting facility is stopped, the amount of cooling water to be supplied is smaller than that during operation. In the present embodiment, in the pre-cooling operation when the casting equipment is stopped, the cooling water is pumped to the heat source 50 at 0.2 MPa.

  The cooling water generated by the cooling water generation facility 100 is supplied to the cooling facility 1 via the branch water channel 11. During the pre-cooling operation, the switching valves 41 and 42 provided in the branch water channel 11 are closed by the control device 60 and the switching valve 42 is opened. Therefore, the cooling water supplied from the cooling water generating facility 100 flows through the first bypass water channel 21 and is supplied to the heat source 50 without passing through the four-pump 12. At this time, since the cooling water is pumped to the cooling facility 1 at 0.2 MPa from the cooling water generating facility 100, the heat source 50 can be appropriately cooled without going through the quadruple pump 12.

  During the pre-cooling operation, the cooling water exchanged by the heat source 50 is returned to the cooling water generation facility 100 without passing through the emergency tank 15. Therefore, during the pre-cooling operation, the switching valves 43 and 44 provided in the first return water passage 14 are closed by the control device 60, the switching valve 44 is opened, and the heat-exchanged cooling water Is circulated through the first return water channel 14 and the second bypass water channel 22 and returned to the cooling water generation facility 100.

[Abnormal operation at abnormal stop]
FIG. 5 is a diagram illustrating an abnormal operation of the cooling facility 1 when the pumping facility of the cooling water generation facility 100 is abnormally stopped due to a disaster such as an earthquake. When a disaster occurs, the casting equipment automatically stops, so the amount of cooling water supplied is less than when it is in operation. In this embodiment, at the time of abnormal operation, the cooling water is pumped to the heat source 50 at 0.2 MPa as in the precooling operation.

  At the time of abnormal operation, the cooling water is not supplied from the cooling water generation facility 100. Therefore, the heat source 50 is cooled using the cooling water stored in the emergency tank 15 during the normal operation. Therefore, when the control device 60 (uninterruptible power supply device) detects a power failure or a stop of the cooling water generating facility 100, the control device 60 (closed state) and the switching valve 43 are opened and the switching valve 43 is opened. In the cooling facility 1, a cooling water circulation circuit configured by the emergency tank 15 → the emergency supply water channel 31 → the heat source 50 → the first return water channel 14 → the emergency tank 15 is configured. And the control apparatus 60 (uninterruptible power supply apparatus) supplies a starting instruction | indication to the generator provided in the emergency pump 32. FIG. In response to the activation instruction, the generator is activated to activate the emergency pump 32, and the cooling water in the emergency tank 15 is increased to 0.2 MPa by the emergency pump 32 and supplied to the heat source 50.

  In addition, although the temperature of the cooling water in the emergency tank 15 rises by supply to the heat source 50, since the temperature of the heat source 50 (in the melting furnace) is as high as 1500 ° C., 100 ° C. cooling water (hot water) ), There is no problem in cooling, and the heat source 50 can be appropriately cooled during abnormal operation.

  Then, the effect of the cooling equipment 1 of this invention is demonstrated. FIG. 6 is a diagram showing a comparison of power consumption between the cooling facility 1 of the present invention and the conventional cooling facility 1A (see FIG. 7).

During normal operation (Monday, Tuesday, Thursday), it is necessary to increase the cooling water pressure to 0.5 MPa and pump it to cool the heat source 50. In this regard, in the conventional cooling facility 1A (see FIG. 7), the cooling water stored in the cooling water tank 2 is increased to 0.5 MPa by driving the large pumps 4, 5, 6. Approximately 35 kWh of power was consumed by driving the pumps 4, 5, and 6.
On the other hand, in the cooling facility 1 of the present invention, the cooling water pumped from the cooling water generating facility 100 at 0.2 MPa is increased by the four-pump 12 and supplied to the heat source 50. Electric power required for water supply can be reduced. In the cooling facility 1 of the present invention, the cooling water in the emergency tank 15 is returned to the main cooling water circulation channel 106 by the return pump 16, even if the driving of the quadruple pump 12 and the return pump 16 is combined. Approximately 25 kWh of power consumption is sufficient.

Further, during normal operation, in the conventional cooling facility 1A, the cooling water in the cooling water tank 2 must be cooled by the cooling tower 3, and the driving of the cooling tower 3 consumes about 20 kWh of electric power. The pumps 4, 5 and 6 were combined with the drive and consumed a maximum of about 55 kWh during normal operation.
On the other hand, in the cooling facility 1 of the present invention, since the heat source 50 is cooled using the cooling water generated by the cooling water generation facility 100, the cooling facility 1 itself does not need to have a cooling tower. No power is required to drive the unique cooling tower.

In addition, when the operation of the casting facility is stopped (water, gold), the heat source 50 is pre-cooled. In the conventional cooling facility 1A (see FIG. 7), the cooling water stored in the cooling water tank 2 is pumped. The large pumps 4, 5, 6 were driven and consumed about 35 kWh.
On the other hand, in the cooling facility 1 of the present invention, during the pre-cooling operation, the cooling water pumped from the cooling water generating facility 100 at 0.2 MPa is supplied to the heat source 50 as it is and returned to the main cooling water circulation channel 106. Therefore, in the cooling facility 1 of the present invention, it is only necessary to control the switching valves 41, 42, 43, and 44 for switching from the normal operation to the pre-cooling operation, and the substantial power consumption becomes 0 kWh during the pre-cooling operation.

  Thus, in the cooling facility 1 of the present invention, power consumption can be suppressed as compared with the conventional cooling facility 1A. Specifically, the power of about 7212 kWh per week (stopped on Saturdays and Sundays) can be suppressed, and the power of 334 MWh per year can be suppressed.

  In addition, since it is not necessary to drive the quadruple pump 12 or the return pump 16 even during abnormal operation, the cooling facility 1 only controls the switching valves 41, 42, 43, 44 and the start-up control of the emergency pump 32. Or, it can be adequately handled by using an existing uninterruptible power supply. Therefore, according to the cooling facility 1 of the present invention, power consumption can be suppressed in normal operation and precooling operation, and safe plant operation can be performed even when an abnormality occurs due to a disaster or the like.

  In the cooling facility 1 of the present invention, the emergency tank 15 is downsized because the cooling water stored in the emergency tank 15 is used only during abnormal operation without being used during normal operation and precooling operation. This can simplify maintenance and save space.

  The preferred embodiment of the cooling facility 1 of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be modified as appropriate.

DESCRIPTION OF SYMBOLS 1 Cooling equipment 11 Branch water channel 12 Quadruple pump 13 Normal supply water channel 14 First return water channel 15 Emergency tank 16 Return pump 21 First bypass water channel 22 Second bypass water channel 31 Abnormal supply water channel 32 Emergency pump 41 , 42, 43, 44 Switching valve 50 Heat source 60 Controller 100 Cooling water generating equipment

Claims (2)

A cooling facility that circulates and cools cooling water pumped at a first pressure from a cooling water generation facility to a heat source,
A branch water channel that branches from the main cooling water circulation channel that circulates the cooling water from the cooling water generation facility, and circulates the cooling water to a heat source;
A first pump disposed in the branch water channel and configured to raise the cooling water at the first pressure to a second pressure and supply the cooling water to the heat source;
A first return water channel for returning the cooling water after heat exchange with a heat source to the main cooling water circulation channel;
An emergency tank that is disposed in the first return water channel and temporarily stores the cooling water after the heat exchange;
A second pump for returning the cooling water in the emergency tank to the main cooling water circulation channel;
A first bypass water channel that bypasses the first pump at the time of heat source pre-cooling and supplies cooling water to the heat source;
One end side is connected to the first return water channel and the other end side is connected to the cooling water generating facility, and when the heat source is precooled, the emergency tank is bypassed and the cooling water after heat exchange with the heat source is circulated into the main cooling water circulation A second bypass channel returning to the channel,
An emergency pump that raises the cooling water in the emergency tank to the first pressure and supplies it to the heat source at the time of an abnormal stop;
A switching valve that switches each water channel during normal cooling during operation of the heat source, during pre-cooling during operation stop of the heat source and during abnormal stop,
A cooling facility comprising:   The cooling facility according to claim 1, wherein the heat source is a molten metal heating coil of a melting furnace.

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