JP2011110547A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent one heat transfer medium from being discharged from a discharge pipe for discharging the other heat transfer medium, in a heat exchanger 10 using a plurality of heat transfer media different in temperature. <P>SOLUTION: The heat exchanger 10 includes a jacket 12 which performs heat exchange between it and a reaction tank 11, and two kinds of heat transfer media which are exchangeably supplied to the jacket 12 and different in temperature from each other. The heat exchanger 10 includes discharge lines 27, 28 which each discharge the heat transfer media from the jacket 12, a temperature sensor 31 which detects the temperature of the heat transfer medium flowing through the discharge line 27 for discharging one heat transfer media, an opening/closing valve 32 which opens/closes the discharge line 27, and a control portion 40 which controls the action of the opening/closing valve 32 so as to open the opening/closing valve 32 when the temperature detected by the temperature sensor 31 is within a range containing the temperature of the one heat transfer medium and not containing the temperature of the other heat transfer medium and to close the opening/closing valve 32 when the temperature detected by the temperature sensor 31 is out of the range. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchange device used for adjusting the temperature of a reaction kettle or the like used in a chemical plant or the like.

  Some reaction kettles used for producing various chemicals and gases in a chemical plant are provided with a heat exchange device for temperature adjustment. This heat exchange device is configured to provide a heat exchange jacket in the reaction kettle and to exchange heat with the reaction kettle by flowing a heat medium through the jacket. There is also a heat exchange device that is used while exchanging different types of heat medium in order to adjust the reaction kettle to a plurality of set temperatures (see, for example, Patent Document 1).

FIG. 3 is a schematic diagram illustrating an example of a conventional heat exchange device. This heat exchange device reacts two kinds of heat media having different heat exchange temperatures, for example, a heat medium containing an organic solvent such as ethylene glycol water (hereinafter also referred to as “organic heat medium”) with water. It is configured so that it can be supplied to a jacket 112 provided on the outer periphery of the shuttle 110.
The heat exchange device includes a first storage tank 113 that stores water and a second storage tank 114 that stores an organic heat medium, and the first and second storage tanks are respectively connected to the jacket 112. The supply side circulation paths 115 and 117 and the discharge side circulation paths 116 and 118 are connected. Each circulation path is provided with on-off valves 120A, 120B, 123A, 123B that are manually opened and closed by an operator's operation. The heat medium is circulated in

JP 2002-226427 A (FIG. 2)

  When two types of heat medium are used as described above, in order to prevent one heat medium from mixing with the other heat medium, the heat medium is completely removed from the jacket 112 after the use of one heat medium. It is necessary to supply the other heat medium after discharging. Therefore, drain pipes 127 and 128 for discharging the heat medium remaining in the jacket 112 are connected to the jacket 112 shown in FIG.

  If the remaining heat medium is water, it can be discarded by flowing it into public water areas such as sewers. However, in the case of a heat medium containing an organic solvent such as ethylene glycol water, If it flows, it causes water pollution, so it is necessary to return to the second storage tank 114 or perform a separate process. Therefore, the drain pipe is divided into a water pipe 127 and an organic heat medium pipe 128. The former drain pipe 127 is connected to a drain groove 129 connected to the sewer, etc., and the latter drain pipe 128 is the first drain pipe 128. Two storage tanks 114 are connected. The drain pipes 127 and 128 are provided with on-off valves 132 and 130 that are manually opened and closed by an operator's operation.

However, in the apparatus shown in FIG. 3, if the on-off valve 132 provided in the water drain pipe 127 is erroneously operated, the organic heat medium flows into the drain pipe 127 and is discharged into the drain groove 129, and the water quality in the public water area Could make it worse.
For example, after cooling the reaction kettle 110 with water, the on-off valve 132 is opened to discharge water remaining in the jacket 112 from the drain pipe 127 to the drain groove 129, and the on-off valve 132 is forgotten to be closed. If the system heat medium is supplied to the jacket 112, the organic heat medium is discharged from the drain pipe 127 to the drain groove 129.

  The present invention has been made in view of such circumstances, and in a heat exchange device that uses a plurality of types of heat media having different temperatures, another heat medium from a discharge line for discharging one heat medium. The purpose is to prevent discharge.

The heat exchange device of the present invention includes a heat exchange unit that exchanges heat with a heat exchange object, a plurality of types of heat media that are exchangeably supplied to the heat exchange unit and that have different temperatures from each other, A heat exchange device comprising:
A discharge line provided corresponding to each heat medium, for discharging each heat medium from the heat exchange unit;
A temperature sensor that is provided in at least one discharge line and detects the temperature of the heat medium flowing through the discharge line;
An on-off valve for opening and closing the discharge line;
When the detection value of the temperature sensor is within a predetermined temperature range including the temperature of the heat medium corresponding to the discharge line and not including the temperature of the other heat medium, the open / close valve is opened, and the detection value of the temperature sensor And a controller that controls the operation of the on-off valve so as to close the on-off valve when the temperature is outside the temperature range.

  According to this configuration, when the temperature of the heat medium flowing through the discharge line is detected by the temperature sensor and the detected value is within a predetermined temperature range including the temperature of the heat medium corresponding to the discharge line, The heat medium is allowed to be discharged by opening the on-off valve by the control unit. On the other hand, if the detected value of the temperature sensor is outside the predetermined temperature range, the heat medium should not be discharged from the discharge line, and therefore the control unit closes the on-off valve to discharge the heat medium. Is blocked. Therefore, only the heat medium corresponding to this can be discharged | emitted from the said drainage line.

The heat medium includes a first heat medium that satisfies a predetermined drainage standard and a second heat medium that does not meet the drainage standard, and the temperature sensor and the on-off valve are disposed in a discharge line of the first heat medium. Is preferably provided.
For example, when water is used as the first heat medium, an organic heat medium is used as the second heat medium, and a temperature sensor and an open / close valve are provided in the water discharge line, The heat medium is not accidentally discharged, and the water quality of public water areas such as sewers is not deteriorated.

The temperature sensor is provided on the upstream side of the discharge line with respect to the open / close valve, and the temperature sensor and the open / close valve have heat flowing until a detection result of the temperature sensor is reflected on the open / close valve. It is recommended that it be installed more than the moving distance of the medium.
Thus, the opening / closing valve can be reliably opened / closed after the temperature sensor detects the temperature of the heat medium flowing through the discharge line until the heat medium reaches the opening / closing valve.

Moreover, it is preferable that the said drainage line is refracted between the said temperature sensor and the said on-off valve, or contains the part arrange | positioned horizontally between the said temperature sensor and the said on-off valve.
When the drainage line is refracted, the length of the discharge line between the temperature sensor and the on-off valve can be made longer than the linear distance between the temperature sensor and the on-off valve. It is possible to secure a sufficient distance.
When the drainage line includes a horizontal part, acceleration due to gravity is not applied to the heat medium flowing through the horizontal part, so that the flow rate of the heat medium can be reduced by that amount, and thereby the distance between the temperature sensor and the on-off valve. Can be shortened.

  According to the present invention, in a heat exchange device that uses a plurality of types of heat media having different temperatures, it is possible to prevent another heat medium from being discharged from a discharge line for discharging one heat medium.

1 is a schematic configuration diagram of a heat exchange system according to an embodiment of the present invention. It is the schematic which shows other embodiment of a drainage line. It is a schematic block diagram of the heat exchange system which concerns on a prior art.

FIG. 1 is a schematic configuration diagram of a heat exchange device 10 according to an embodiment of the present invention.
This heat exchange device 10 is for adjusting the temperature of a reaction kettle (heat exchange object) 11 used for producing chemical substances such as various chemicals and gases, and surrounds the outer periphery of the reaction kettle 11. The first supply-side circulation that connects the jacket 12 and the first storage tank 13, the first storage tank 13 and the second storage tank 14 that store the heat medium, and the jacket (heat exchange unit) 12 that is provided to do so. A path 15 and a first discharge side circulation path 16, and a second supply side circulation path 17 and a second discharge side circulation path 18 that connect the jacket 12 and the second storage tank 14 are provided.

  In this embodiment, water is used as the first heat medium, and an organic heat medium such as ethylene glycol water is used as the second heat medium. Water is stored in the first storage tank 13, and the organic heat medium is stored in the second storage tank 14. In this case, the first storage tank 13 may be a pool or a reservoir for storing water. The second storage tank 14 may be a tank that stores an organic heat medium. Examples of organic heat media include liquids that have high COD (Chemical Oxygen Demand) and exceed the standards of waste water stipulated in the Water Pollution Control Law and the standards of facilities that use heat exchange equipment. Can be used that are restricted from being discharged into public water areas. On the other hand, water meets the drainage standard and is allowed to be discharged into public water bodies.

  The first supply side circulation path 15 and the first discharge side circulation path 16 are provided with on-off valves 20A and 20B that are manually opened and closed by an operator's operation (including remote operation, the same applies hereinafter). The first supply side circulation path 15 is provided with a pump 21. Then, by operating the pump 21 with the on-off valves 20A and 20B opened, water is supplied from the first storage tank 13 through the first supply side circulation path 15 into the jacket 12, and passes through the jacket 12. The water after the heat exchange is returned to the first storage tank 13 via the first discharge side circulation path 16. Thereby, water circulates between the first storage tank 13 and the jacket 12.

The second supply side circulation path 17 and the second discharge side circulation path 18 are provided with on-off valves 23A and 23B that are manually opened and closed by an operator's operation. The second supply side circulation path 17 is provided with a pump 24 and a cooling unit 25. Then, by operating the pump 24 with the on-off valves 23A and 23B being opened, the organic heat medium is supplied from the second storage tank 14 to the cooling unit 25 via the second supply side circulation path 17, and this cooling is performed. The organic heat medium cooled by passing through the unit 25 is supplied into the jacket 12, and the organic heat medium after heat exchange that has passed through the jacket 12 is stored in the second storage via the second discharge side circulation path 18. Returned to tank 14. As a result, the organic heat medium circulates between the second storage tank 14 and the jacket 12.
In the present embodiment, the first supply-side circulation path 15 and the second supply-side circulation path 17 merge with each other at the connecting portion with respect to the jacket 12, and the first discharge-side circulation path 16 and the second discharge-side circulation path 18 Are joined together at the connection to the jacket 12.

  The heat exchange device 10 of the present embodiment can adjust the temperature of the reaction kettle 11 by supplying water to the jacket 12 while exchanging water and the organic heat medium according to the reaction process in the reaction kettle 11. It has become. In this embodiment, the temperature of water is about 20 degrees, and the temperature of the organic heat medium is about -10 degrees. Therefore, there is a temperature difference of about 30 degrees between water and the organic heat medium.

  Moreover, since the heat exchange apparatus 10 of this embodiment uses two types of heat media, water and an organic heat medium, one heat medium is used so that these two types of heat media are not mixed. After using, when switching to the other heat medium, all the heat medium remaining in the jacket 12 is discharged (drained). Therefore, first and second drain pipes 27 and 28 (discharge lines of the present invention) for discharging the heat medium remaining in the jacket 12 are connected to the lower portion of the jacket 12.

  The downstream end of the first drain pipe 27 is connected to a drainage groove 29, and the water remaining in the jacket 12 is discharged to a public water area such as a sewer. In addition, as described above, the organic heat medium deteriorates the water quality when it is passed directly to the public water area. Therefore, the downstream end of the second drain pipe 28 is connected to the second storage tank 14 and remains in the jacket 12. The heat medium is returned to the second storage tank 14. The first drain pipe 27 and the second drain pipe 28 merge with each other in the vicinity of the connection portion with the jacket 12.

  The second drain pipe 28 is provided with a second drain on-off valve 30 that is manually opened and closed by an operator's operation. The jacket 12 is connected to a gas supply device 33 for supplying a pressurized gas such as nitrogen gas. When the heat medium to be used is switched from an organic heat medium to water, the organic heat medium remaining in the jacket 12 is pumped by opening the second drain on-off valve 30 and operating the gas supply device 33. And return to the second storage tank 14.

On the other hand, the first drain pipe 27 is provided with a temperature sensor 31 and a first drain open / close valve 32. Further, the heat exchange device 10 includes a control unit (control circuit) 40 that controls the operation of the first drain on-off valve 32 in accordance with the detection value of the temperature sensor 31.
The temperature sensor 31 measures the temperature of the heat medium flowing through the first drain pipe 27. For example, a thermocouple or a thermistor is used. The detection value of the temperature sensor 31 is input to the control unit 40.

  The first drain open / close valve 32 is disposed downstream of the temperature sensor 31 and uses an automatic open / close valve such as an electromagnetic valve or an electric valve that automatically opens and closes according to a control signal from the control unit 40. The first drain opening / closing valve 32 is controlled by the control unit 40 so that it opens when the detection value of the temperature sensor 31 falls within a predetermined temperature range and closes when the temperature is outside the temperature range.

The control unit 40 of this embodiment determines whether or not the detected value is included in a predetermined temperature range by comparing the detected value of the temperature sensor 31 with a predetermined threshold value. And this threshold value opens the first drain on-off valve 32 when the detected value is in the temperature range equal to or higher than the threshold value, allows the heat medium to be discharged from the first drain pipe 27, and falls within the temperature range below the threshold value. In such a case, the first drain opening / closing valve 32 is closed to prevent discharge of the heat medium.
In the present embodiment, the water as the first heat medium is about 20 degrees and the organic heat medium as the second heat medium is about -10 degrees, so the threshold value is a value between both temperatures, For example, it is set to 0 degrees.

  When switching to an organic heat medium after using water for heat exchange, the temperature sensor 31 detects the temperature of the water remaining in the jacket 12 and flowing into the first drain pipe 27. Since the water is in the temperature range of 0 ° C. or more which is a threshold value, the first drain opening / closing valve 32 is opened and the water is discharged to the drainage groove 29. Thereafter, when the organic heat medium is circulated, when the organic heat medium flows into the first drain pipe 27, the temperature is detected by the temperature sensor 31. Since the organic heat medium is in a temperature range of less than 0 degrees, the first drain on-off valve 32 is closed, and the discharge of the organic heat medium to the drain groove 29 is prevented. Therefore, the water quality of public water bodies is not deteriorated by the organic heat medium.

  The temperature sensor 31 and the first drain opening / closing valve 32 are arranged with a predetermined interval therebetween. This interval is set to be equal to or longer than the distance through which the heat medium flows from when the temperature sensor 31 detects the temperature of the heat medium until the detected value is reflected in the operation of the first drain on-off valve 32. . Thus, the first drain on / off valve 32 opens or closes between the time when the heat medium passes through the temperature sensor 31 and reaches the first drain on / off valve 32. The heat medium does not pass through the first drain opening / closing valve 32 and is discharged into the drainage groove 29.

FIG. 2 is a schematic view showing another embodiment of the first drain pipe 27. The first drain pipe 27 includes a first vertical pipe 34 that extends downward from the lower portion of the jacket 12, a horizontal pipe 35 that extends horizontally from the lower end of the first vertical pipe 34, and a downward direction from the end of the horizontal pipe 35. The second vertical pipe 36 extends, and the lower end of the second vertical pipe 36 is connected to the drainage groove 29. Therefore, the first drain pipe 27 of this embodiment has a refracted structure.
The temperature sensor 31 is provided in the first vertical pipe 34, and the first drain opening / closing valve 32 is provided in the second vertical pipe 36. Accordingly, a horizontal pipe 35 is disposed between the temperature sensor 31 and the first drain opening / closing valve 32.

  Here, if the temperature sensor 31 and the first drain opening / closing valve 32 are provided with respect to a straight vertical pipe 34A as shown by a two-dot chain line, for example, the heat medium is accelerated by gravity. As a result, the flow rate increases, and it flows between the temperature sensor 31 and the first drain opening / closing valve 32 in a short time. Therefore, it is necessary to increase the distance between the temperature sensor 31 and the first drain opening / closing valve 32, and the piping structure is enlarged.

  On the other hand, in the present embodiment, a horizontal pipe 35 is provided between the temperature sensor 31 and the first drain opening / closing valve 32, and acceleration due to gravity is not applied to the heat medium flowing through the horizontal pipe 35. The flow rate of the heat medium is reduced. Therefore, the time until the heat medium reaches the first drain opening / closing valve 32 from the temperature sensor 31 can be lengthened, and accordingly, the distance between the temperature sensor 31 and the first drain opening / closing valve 32 is shortened, The piping structure can be made compact.

  In the present embodiment, since the first drain pipe 27 has a refracted structure, the length of the first drain pipe 27 is set to be longer than the actual distance L between the temperature sensor 31 and the first drain on-off valve 32. The time from when the heat medium passes the temperature sensor 31 until it reaches the first drain opening / closing valve 32 can be increased. Therefore, the distance L between the temperature sensor 31 and the first drain opening / closing valve 32 can be shortened as much as possible, and the piping structure can be made compact.

  Moreover, in this embodiment, since the 1st drain on-off valve 32 which consists of an automatic on-off valve is used with respect to the 1st drain pipe 27 and a manual on-off valve is used for the other on-off valves, the heat exchange apparatus The overall configuration can be simple and inexpensive.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate.
For example, a temperature sensor is also provided for the second drain pipe 28 in the above embodiment, and an automatic opening / closing valve that automatically opens and closes according to the detected value of the temperature sensor can be used as the second drain opening / closing valve 30. . However, as in the present embodiment, when water and an organic heat medium are used as the heat medium and water is discharged to the public water area through the first drain pipe, at least the first drain pipe 27 On the other hand, if the temperature sensor 31 and the automatic opening / closing valve 32 are provided, it is sufficient in terms of preventing water pollution, and the cost increase due to the provision of these can be minimized.

  Moreover, the temperature range (threshold value) for opening and closing the first drain on-off valve 32 can be appropriately changed according to the type and temperature of the heat medium to be used. For example, when a heat medium having a temperature higher than water is used as the second heat medium, a temperature between water and the second heat medium is set as a threshold value, and a temperature detected by the temperature sensor 31 is lower than the threshold value. The automatic open / close valve 32 may be opened when the temperature is within the range, and the automatic open / close valve 32 may be closed when the temperature is within the threshold value.

  Moreover, in the said embodiment, although the 1st drain pipe 27 and the 2nd drain pipe 28 are made into the discharge line of this invention, the 1st discharge side circulation path 16 and the 2nd discharge side circulation path 18 are set as the discharge line of this invention. can do. In this case, by providing a temperature sensor for one or both of the discharge-side circulation paths 16 and 18 and an automatic opening / closing valve that opens and closes according to the detected value of the temperature sensor, It is possible to prevent the heat medium from flowing and prevent the two kinds of heat medium from mixing.

  Moreover, the heat exchange apparatus 10 of the present invention may use three or more types of heat medium, and a temperature sensor and an automatic opening / closing valve can be provided for any or all of the discharge lines. . Also, the type of heat medium to be used is not limited to water and organic heat medium. For example, instead of or in addition to organic heat medium, inorganic heat medium that is restricted from being discharged into public water bodies is used. A heat medium can also be used.

10: Heat exchange device 11: Reactor (heat exchange object)
12: Jacket (heat exchanger)
27: First drain pipe (discharge line)
28: Second drain pipe (discharge line)
31: Temperature sensor 32: First drain on-off valve 35: Horizontal pipe (horizontal part)
40: Control unit

Claims (5)

A heat exchange device comprising a heat exchange unit that exchanges heat with an object to be exchanged, and a plurality of types of heat media that are exchangeably supplied to the heat exchange unit and have different temperatures. There,
A discharge line provided corresponding to each heat medium, for discharging each heat medium from the heat exchange unit;
A temperature sensor that is provided in at least one discharge line and detects the temperature of the heat medium flowing through the discharge line;
An on-off valve for opening and closing the discharge line;
When the detection value of the temperature sensor is within a predetermined temperature range including the temperature of the heat medium corresponding to the discharge line and not including the temperature of the other heat medium, the open / close valve is opened, and the detection value of the temperature sensor And a controller that controls the operation of the on / off valve so that the on / off valve is closed when the temperature is outside the temperature range.   The heat medium includes a first heat medium that satisfies a predetermined drainage standard and a second heat medium that does not meet the drainage standard, and the temperature sensor and the on-off valve are disposed on a discharge line of the first heat medium. The heat exchange apparatus according to claim 1, wherein The temperature sensor is provided on the downstream side of the discharge line from the on-off valve;
The temperature sensor and the on-off valve are installed apart from the moving distance of the heat medium that flows until the detection result of the temperature sensor is reflected on the on-off valve. Heat exchange device.   The heat exchange device according to any one of claims 1 to 3, wherein the drainage line is refracted between the temperature sensor and the on-off valve.   The heat exchanging device according to any one of claims 1 to 4, wherein the drainage line includes a portion disposed horizontally between the temperature sensor and the on-off valve.

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