JP2004019971A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger which can prevent the generation of unevenness of temperature by preventing stagnation of the cooling fluid inside of a supply pipe. <P>SOLUTION: A heating fluid supply pipe 10 and a cooling fluid supply pipe 11 are connected to a jacket part 2. A valve 13, a ring pipe 14 and filling nozzles 15 and 16 are fitted to the cooling fluid supply pipe 11 in this order. A suction piping 22 is fitted to the cooling fluid supply pipe 11, and connected to an ejector 5. When switching a reaction furnace 1 from cooling to heating, the cooling fluid stagnating in the ring pipe 14 is sucked for discharge from the suction piping 22 to prevent the generation of unevenness of temperature. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for directly or indirectly exchanging heat in a heat exchange chamber in a heat exchange chamber. In particular, when switching from cooling to heating or when once cooling is completed and then cooled again, temperature unevenness occurs. To a heat exchanger without the need.
[0002]
[Prior art]
As a conventional heat exchange device, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 7-208845. This is one in which an injection nozzle is attached to a jacket provided on the outer periphery of a reaction vessel, a cooling water supply pipe is connected to the injection nozzle, and a valve device is arranged in the cooling water supply pipe.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional apparatus, when switching from cooling to heating, or when cooling is performed once and then cooled again, temperature unevenness occurs, and the heat exchange target is thermally damaged, or the apparatus is There was a problem that productivity could not be improved sufficiently.
[0004]
This is because when the supply of cooling water is stopped and the valve device is closed to complete the cooling, the cooling water stays between the outlet side of the valve device and the injection nozzle, and the accumulated cooling water is heated. When the cooling water flows into the heat exchange chamber, which is originally filled with the heating steam, the cooling water flows down, causing temperature unevenness. Usually, since the hole diameter of the injection nozzle is relatively small, the cooling water in the cooling water supply pipe cannot be quickly replaced, and the cooling water stays in the supply pipe on the outlet side of the valve device.
[0005]
Therefore, an object of the present invention is to obtain a heat exchange device that does not cause temperature unevenness by preventing the cooling fluid from remaining in a supply pipe.
[0006]
[Means for Solving the Problems]
Means for solving the above-mentioned problems include connecting a heating fluid supply pipe or a cooling fluid supply pipe to the heat exchange chamber to exchange heat with the heat exchange target, and connecting the heat exchange chamber to the suction means. A suction line connecting a suction means to a cooling fluid supply pipe on the heat exchange chamber side of the valve, wherein a valve for switching between supply and stop of the cooling fluid to the heat exchange chamber is attached to the cooling fluid supply pipe. Is attached.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
By attaching the suction pipe line connected to the suction means to the cooling fluid supply pipe on the heat exchange chamber side of the valve, the cooling fluid retained in the cooling fluid supply pipe on the heat exchange chamber side by closing the valve is By being removed by suction from the suction pipe line to the suction means, it does not flow down into the heat exchange chamber, and therefore, there is no temperature unevenness in the heat exchange chamber.
[0008]
【Example】
In the present embodiment, an example is shown in which a reactor 1 for performing heat exchange is used. The object to be heat-exchanged (not shown) placed in the reactor 1 is subjected to heat exchange with steam as a heating fluid supplied to the jacket portion 2 and cooling water as a cooling fluid.
[0009]
A jacket portion 2 is formed over substantially the entire circumference of the reaction vessel 1, and a heating fluid supply pipe 10 and a cooling fluid supply pipe 11 are connected. An automatic control valve 12 for adjusting the amount of steam to be supplied is attached to the steam supply pipe 10 for heating. A valve 13 for switching between supply and stop of the cooling water is attached to the cooling water supply pipe 11, and a ring-shaped ring pipe 14 surrounding the outer periphery of the jacket 2 is attached. Cooling water injection nozzles 15 and 16 are provided upward from the ring pipe 14 and connected to the jacket 2.
[0010]
From the lower part of the jacket part 2, it is connected to an ejector type vacuum pump 4 as suction means by a conduit 3. The ejector-type vacuum pump 4 connects the ejector 5, the tank 6, and the circulating pump 7 with the circulating path 8, respectively. Thus, a vacuum suction force is generated.
[0011]
A steam trap 17 and a valve 18 are attached to the pipe 3 in parallel, and a cooling fluid replenishing pipe 19 and an overflow pipe 20 are connected to the upper part of the tank 6 respectively. Further, a part of the circulation path 8 is branched to connect the surplus fluid discharge pipe 21.
[0012]
The suction pipe 22 is attached to the ring pipe 14 on the jacket 2 side of the valve 13 attached to the cooling fluid supply pipe 11, and is connected to the ejector 5 of the ejector vacuum pump 4. A valve 23 is arranged in the suction line 22.
[0013]
When cooling the reactor 1, the valve 23 is closed and the valve 13 of the cooling fluid supply pipe 11 is opened, whereby cooling water is supplied from the injection nozzles 15 and 16 to the jacket portion 2, The heat exchange object in the reaction vessel 1 is cooled. In addition, by driving the ejector type vacuum pump 4 to make the inside of the jacket portion 2 a vacuum state below the atmospheric pressure, the reaction vessel 1 can be vaporized and cooled by the latent heat of evaporation of the cooling water. A part of the vaporized steam and cooling water generated by cooling is sucked into the ejector 5 through the valve 18.
[0014]
If the valve 13 is closed when the cooling is stopped and the heating is switched to heating, the cooling water stays in the ring pipe 14 between the outlet side of the valve 13 and the injection nozzles 15 and 16. By opening the valve 23 of 22, the staying cooling water is sucked out by the ejector 5 and does not flow down into the jacket portion 2.
[0015]
When heating the reactor 1, the heat exchange target in the reactor 1 is heated by supplying steam having a temperature suitable for heating from the steam supply pipe 10 to the jacket portion 2. A portion of the condensed steam condensed by heating and a portion of the steam not condensed are drawn into the ejector 5 from the pipe 3 through the steam trap 17 or the valve 18 and reach the tank 6.
[0016]
The heating temperature is adjusted by appropriately adjusting the pressure of the steam supplied to the jacket portion 2 by the automatic control valve 12 and adjusting the vacuum suction force of the ejector type vacuum pump 4 to the temperature of the fluid flowing down the ejector 5 as appropriate. For example, the temperature can be arbitrarily set from about 40 ° C. to a temperature exceeding 100 ° C.
[0017]
In the present embodiment, when switching from cooling to heating, the cooling water staying in the ring pipe 14 is removed by suction from the suction pipe line 22 and then the heating steam is supplied to the jacket portion 2. Thereby, the cooling water in the ring tube 14 does not flow down into the jacket portion 2, and the heating temperature unevenness of the reaction vessel 1 can be prevented.
[0018]
【The invention's effect】
By installing a suction pipe line connected to the suction means on the heat exchange chamber side of the valve attached to the cooling fluid supply pipe, the cooling fluid stays in the cooling fluid supply pipe when switching from cooling to heating. Therefore, it is possible to obtain a heat exchange device that does not cause temperature unevenness.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a heat exchange device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction pot 2 Jacket part 4 Ejector type vacuum pump 5 Ejector 10 Heating fluid supply pipe 11 Cooling fluid supply pipe 13 Valve 14 Ring pipe 15, 16 Injection nozzle 22 Suction pipe 23 Valve

Claims (1)

A heating fluid supply pipe or a cooling fluid supply pipe is connected to the heat exchange chamber to exchange heat with the heat exchanged object, and the heat exchange chamber is connected to the suction means to exchange heat with the cooling fluid supply pipe. A heat exchange device, comprising: a valve for switching supply and stop of a cooling fluid to the chamber; and a suction pipe for connecting a suction means to a cooling fluid supply pipe on the heat exchange chamber side of the valve. .

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