JP2003262492A - Sample fluid cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sample fluid cooling device retaining favorable cooling efficiency by preventing scale from sticking to a heat exchange tube. <P>SOLUTION: This sample fluid cooling device 1 roughly comprises a casing 2 having a hollow cylindrical shape and allowing cooling fluid to pass through an inside space, the heat exchange tube 3 provided in the inside space of the casing 2, and a hammering device 4 applying vibration to the heat exchange tube 3. The hammering device 4 comprises a knocker 21 and an impulsive force transmission part 22 transmitting an impulsive force from the knocker 21 to the heat exchange tube 3 in the casing 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample fluid cooling device for cooling a high temperature sample fluid collected from a circulation system of boiler water.

[0002]

2. Description of the Related Art In power generation facilities such as thermal power plants and nuclear power plants, the water quality of boiler water is analyzed to control the water quality of the boiler.
A sample fluid is taken from the circulation system of boiler water and introduced into a water quality analyzer (sample fluid analyzer). At that time, the sample fluid is cooled by the sample fluid cooling device to a temperature at which the sample fluid analyzer can analyze.

A conventional sample fluid cooling device generally supplies cooling water as a cooling fluid to the inner space of a hollow casing to immerse a heat exchange tube and pass a high temperature sample fluid through the heat exchange tube. The sample fluid is cooled by exchanging heat between the sample fluid and the cooling water via the heat exchange tube.

[0004]

By the way, the cooling water of the above-described sample fluid cooling device contains a rust preventive agent and the like,
It suppresses deterioration of pipes and devices in the cooling water circulation system due to corrosion and the like. The rust preventive agent and the like are composed of substances such as calcium, magnesium, iron and silica. Then, when the sample fluid is cooled by the sample cooling device, the sample fluid is cooled by heat exchange and the cooling water around the heat exchange tube is heated to a high temperature, and the above substances are precipitated from the cooling water to perform heat exchange as scale. It adheres to the surface of the tube. The precipitate as the scale reduces the heat exchange rate of the heat exchange tube, and if the scale is left as it is, it becomes difficult to cool the sample fluid. Therefore, in order to efficiently perform the cooling operation of the sample fluid by the sample fluid cooling device, it was necessary to remove this scale from the heat exchange tube. Also, this scale was removed when the sample fluid cooling device was disassembled and the periodic inspection was performed, but it is so hard that it cannot be removed without hitting it with a tool such as a scraper or hammer, so the removal work is extremely troublesome. Was there. Further, the heat exchange tube may be damaged by the tool during the scale removing work, which may rather shorten the life of the sample fluid cooling device.

The present invention has been proposed in view of the above circumstances, and an object thereof is to prevent a scale from adhering to a heat exchange tube and maintain a cooling efficiency, that is, a heat exchange efficiency in a good state. An object is to provide a fluid cooling device.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and the object of claim 1 is to provide a hollow casing through which a cooling fluid is passed in an internal space,
A sample fluid cooling device, comprising: a heat exchange tube provided in an inner space of the casing; the sample fluid being passed through the heat exchange tube to be cooled by a cooling fluid, wherein the heat exchange tube in the casing is vibrated. A sample fluid cooling device having a vibration mechanism.

According to a second aspect of the present invention, there is provided the sample fluid cooling device according to the first aspect, wherein the vibration mechanism is provided near the sample fluid upstream side of the heat exchange tube in the casing. .

According to a third aspect of the present invention, the vibrating mechanism includes an impact generating source for generating an impact, and an impact transmitting section for transmitting the impact generated from the impact generating source to the heat exchange tube. 2. The heat exchange tube is vibrated by the hammering force transmitted from the hammering force transmitting section.
Alternatively, the sample fluid cooling device according to claim 2.

According to a fourth aspect of the present invention, the hammering force transmitting section moves in the shaft sealing section provided in an opening formed in the casing and the shaft sealing section with its tip facing the outer peripheral surface of the heat exchange tube. The sample fluid cooling device according to claim 3, wherein the sample fluid cooling device comprises a movable rod, and the tip of the rod is brought into contact with the outer peripheral surface of the heat exchange tube to transmit the impact force.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a sample fluid cooling device 1 according to an embodiment of the present invention, and FIG. 2 is a plan sectional view of the sample fluid cooling device 1.

The sample fluid cooling device 1 is a casing 2 having a hollow cylindrical shape, a heat exchange tube 3 provided in the internal space of the casing 2, a kind of vibration mechanism in the present invention, and a heat exchange tube. 3 and a hammering device 4 for applying vibration to the vibration generator 3.

The casing 2 is constructed by closing the tip (upper end in FIG. 1) and the base end (lower end in FIG. 1) of a thin cylindrical body 6 with thick lids 7 and 8. , Has a hollow internal space. In this internal space, a first partition pipe 9 having a diameter smaller than that of the body portion 6 and a second partition pipe 10 having a diameter smaller than that of the first partition pipe 9 are arranged concentrically with the body portion 6.
These partition tubes 9 and 10 are provided so as to divide the internal space into a cylindrical shape and to form a triple cylindrical space inside the casing 2.

Further, one end of the first partition pipe 9 is connected to the distal end side lid 7 and the other end is separated from the base end side lid 8 so that the body portion 6 and the first partition pipe 9 are separated from each other. A first communication port 12 that communicates the space with the inside of the first partition pipe 9 is formed. Further, the second partition pipe 10 has one end connected to the base end side lid 8 and the other end separated from the tip end side lid 7 to form the first partition pipe 9
A second communication port 13 that communicates the space between the second partition tube 10 and the inside of the second partition tube 10 is formed. By arranging the partition tubes 9 and 10 in this manner, the casing 2
Is configured such that the triple cylindrical space communicates in a zigzag manner in the radial direction.

The casing 2 has a base end side lid 8
A cooling fluid outlet 14 is provided in the second partition pipe 10 so as to communicate with the inside of the second partition pipe 10, and a cooling fluid outlet 15 is provided in the tip side lid 7.
Are opened so as to communicate with the gap between the body portion 6 and the first partition pipe 9. Further, these cooling fluid inlets 14
A cooling fluid circulation system (not shown) is connected to the cooling fluid outlet 15. Therefore, when a cooling fluid such as cooling water or a refrigerant liquid flows into the casing 2 from the cooling fluid inlet 14, the cooling fluid flows in the second partition pipe 10,
A three-fold cylindrical space in the order of the gap between the outer peripheral surface of the second partition tube 10 and the inner peripheral surface of the first partition tube 9, and the gap between the outer peripheral surface of the first partition tube 9 and the inner peripheral surface of the body portion 6. Through the cooling fluid outlet 15.

In the inner space of the casing 2, a heat exchange tube 3 for passing a sample fluid having a temperature higher than that of the cooling fluid.
Are provided while forming two spiral shapes. Specifically, this heat exchange tube 3 penetrates the tip side lid 7 with one end serving as the sample fluid inlet 17, and in the gap between the body portion 6 and the first partition tube 9 in the internal space, the first partition tube The first partition pipe 9 and the second partition pipe 9 pass through the inner space in the longitudinal direction while forming the outer spiral portion 3a so as to surround 9 and reduce the radius of curvature of the spiral in the vicinity of the first communication port 12. In the gap between the first partition tube 9 and the outer wall of the first partition tube 9, an inner spiral section 3b is formed in a direction opposite to the outer spiral section 3a so as to surround the first partition tube 9. A sample fluid outlet 18 is formed through the tip side lid 7. It is to be noted that the heat exchange tube 3 is preferably one having a high thermal conductivity, and for example, a copper tube is preferably used as a material, but a material in consideration of rust prevention with respect to the sample fluid and the cooling fluid, For example, stainless steel piping may be used if the main component of each fluid is water.

Next, the hammering device 4, which is a kind of the vibration mechanism of the present invention, will be described. Hammering device 4
Is a device for vibrating the heat exchange tube 3 by indirectly striking the heat exchange tube 3 to transmit a striking force. The hammering device 4 is provided on the outer peripheral surface of the casing 2 near the front end of the casing 2, more specifically, at a position of about 1/3 of the entire length from the front end of the casing 2. Of the heat exchange tubes 3 in the casing 2 near the sample fluid inlet 17;
That is, the knocker 21 is provided in the vicinity of the upstream side of the sample fluid, and is composed of a knocker 21 as a hammer force generation source and a hammer force transmission section 22 for transmitting the hammering force from the knocker 21 to the heat exchange tube 3 in the casing 2. To be done.

The knocker 21 is provided with a knocking portion 23 which is movable toward a hitting force transmitting portion 22 which will be described later.
3 has a structure in which a force is generated by moving 3 to the force transmission unit 22 and hitting the force transmission unit 22, and in this embodiment, an air cylinder is applied to the knocker 21. The air cylinder as this knocker 21
The tip of the knocker rod 25 (cylinder rod) is directed to the heat exchange tube 3 on the bracket 24 which is detachably provided on the outer peripheral surface of the body 6 of the casing 2, and the tip of the knocker rod 25 and the outside of the heat exchange tube 3 are arranged. Spiral part 3a
Mounted so as to vertically face the outer surface of the. Further, the knocker 21 has a columnar knock portion 23 at the tip of the knocker rod 25, and the knock portion 2
The tip end surface of 3 is opposed to the hammering force transmitting portion 22. Also,
The knocker 21 is connected to an air supply pipe 26 that supplies air for driving the knocker rod 25. A knocker operation panel 27 for controlling the air supply is provided in the middle of the air supply pipe 26, and the operating state of the knocker 21 of the hammering device 4, for example, the magnitude of the impact force, the frequency of the impact force generation, and the cycle. Is preset, and the knocker 21 can be operated by controlling the air supply by opening or blocking the air supply pipe 26 according to this setting.

The knocker 21 always urges the knocker rod 25 in the contracting direction (rightward in the figure) by an urging member (not shown) such as a spring to strike the knock portion 23 and the knocker rod 25. By retracting from the force transmission portion 22, the tip end surface of the knock portion 23 and the impact transmission portion 22 are separated from each other. When a knocking force is generated, the knocker operating panel 27 opens the air supply pipe 26 to supply air, so that the knocker rod 25 extends the knocker rod 25 against the urging force of the urging member. The knock portion 23 collides with the impact force transmission portion 22. Then, after the impact force is generated by this collision, the knocker operation panel 27 causes the air supply pipe 26 to
Is shut off, the air supply to the knocker 21 is stopped, the knocker rod 25 is contracted by the urging force of the urging member, and the knocker rod 25 is retracted again from the striking force transmission portion 22 to return to the initial position.

On the other hand, the impact transmission section 22 is the knock section 2 described above.
The hammering force generated by the forward movement of 3 is transmitted to the heat exchange tube 3 in the casing 2. Specifically, the impact transmission section 22 is provided on the outer peripheral surface of the casing 2, and the body section 6 of the casing 2 is provided.
The shaft sealing portion 31 has an insertion hole 31a in a state of being communicated with the opening 2a formed in the opening 2a, and a rod 32 movable in the insertion hole 31a of the shaft sealing portion 31.

The shaft sealing portion 31 is inserted through the insertion hole 31 with respect to the surface of the body portion 6 of the casing 2 and the surface of the heat exchange tube 3.
It is provided in a state of covering the opening 2a of the casing 2 so that the axis of a is vertical. A packing 31b such as a gland packing is provided between the inner peripheral surface of the casing 2 and the insertion hole 31a and the outer peripheral surface of the rod 32 while sealing the rod 32 in a movable state.
2 is guided so as to be movable in a direction perpendicular to the outer peripheral surface of the outer spiral portion 3a of the heat exchange tube 3.

The rod 32 has a tip portion projecting from the shaft sealing portion 31 inserted into the casing 2 through the opening 2a of the casing 2 so as to form the outer peripheral surface of the heat exchange tube 3, more specifically, the outer spiral portion 3a. The exchange tube 3 can be brought into contact with the outer surface of the exchange tube 3, and the rear end protruding from the opposite side of the shaft sealing portion 31 is opposed to the knock portion 23 of the knocker 21 so that the impact force from the knocker 21 can be received. .

With the above-described structure, the hammering device 4 has the cooling fluid in the casing 2 even when the cooling fluid is filled in the inner space of the casing 2 and flows around the heat exchange tube 3. Without leaking
A knocking force, which is a knocking force generating source, can be applied to the heat exchange tube 3 through the hitting force transmitting portion 22.

In the present embodiment, the air cylinder is applied to the knocker 21 which is the source of the force of attack and the air supply pipe 26 is connected. However, the force of force is generated by the hydraulic cylinder and the hydraulic oil supply line. You may comprise. Further, a plunger type electromagnetic solenoid is applied as the knocker 21, and a control panel capable of controlling the operation of the solenoid is provided to be electrically connected to the solenoid so that the plunger of the solenoid can be moved to generate a striking force. You may

Next, the operation of the sample fluid cooling device 1 having the above structure will be described. The knocker operation panel 27 opens and shuts off the air supply pipe 26 so that the knocker 21 periodically generates a hammering force enough to vibrate the heat exchange tube 3 (a hammer) after a desired time has elapsed. It is set in advance to a state in which it is turned on. For example, it is set to hit once after one minute.

First, the cooling fluid is introduced from the cooling fluid inlet port 14 of the base end side lid 8, and the cooling fluid outlet port 15 of the distal end side lid 7 is introduced.
And the cooling fluid is passed around the heat exchange tube 3 in the casing 2. Next, a high-temperature sample fluid is introduced from the sample fluid inflow port 17 of the heat exchange tube 3, and the inside spiral portion 3 is fed from the inside of the outside spiral portion 3 a of the heat exchange tube 3.
It is made to flow out to the sample fluid outflow port 18 through b. Then, the sample fluid, while flowing in the heat exchange tube 3, gradually releases heat to the cooling fluid via the heat exchange tube 3 to perform heat exchange with the cooling fluid, thereby lowering the temperature.

With the above heat exchange, the cooling fluid is heated,
A constituent substance such as a rust preventive agent contained in this cooling fluid serves as a scale, and the outer surface of the heat exchange tube 3 has a large temperature difference between the sample fluid and the cooling fluid, and a portion where heat exchange is most likely to occur, specifically, In particular, it tends to be deposited on the outer surface of the outer spiral portion 3a of the heat exchange tube 3 which is located approximately 1/3 of the entire length from the tip of the casing 2.

However, when the time set in the knocker operation panel 27 has elapsed, air is supplied from the air supply pipe 26 to the knocker 21 via the knocker operation panel 27,
The knock portion 23 moves forward with the knocker rod 25 toward the rod 32 of the impact transmission portion 22. The knock portion 23 that has moved forward collides with the tip of the rod 32 and generates a striking force. This hammering force is transmitted to the heat exchange tube 3 whose periphery is covered with the cooling fluid while slightly moving the rod 32 to the heat exchange tube 3 side (left side in the figure). And
This heat exchange tube 3 has the sample fluid inlet 17 side and the sample fluid outlet 18 side, that is, the tip side lid 7 side of the casing 2 as fixed ends due to the impact force, and the moving direction of the rod 32, in other words, hammering. Bends in the direction opposite to the position of the device 4. The bent heat exchange tube 3 returns to its original position due to the restoring force, and this time it bends in the direction in which the hammering device 4 is located due to the inertial force, and again after being restored due to the restoring force, the direction opposite to the position of the hammering device 4 Bend to. By repeating these flexures alternately, the heat exchange tube 3 vibrates. Therefore, the scale that tends to deposit on the outer surface of the heat exchange tube 3 is less likely to deposit on the outer surface due to this vibration. Then, the scale flows out of the casing 2 together with the cooling fluid.

After that, the knocker operation panel 27 periodically operates the knocker 21, that is, the hammering device 4,
The heat exchange tube 3 is vibrated. Therefore, even if the sample fluid is subsequently cooled, the scale is unlikely to adhere to the heat exchange tube 3, and the sample fluid can be cooled while maintaining a good heat exchange state. Further, even if the scale adheres, the scale can be separated by the vibration generated in the heat exchange tube 3 and flow out to the outside of the casing 2 together with the cooling fluid, so that the heat conductivity of the heat exchange tube 3 is maintained. This facilitates the cooling operation of the sample fluid and makes it possible to efficiently perform the cooling operation.

Further, the rod 32 is the heat exchange tube 3
Since the tip end is brought into contact with the outer peripheral surface of the core substantially vertically and the hammering force generated by the knocker 21 is transmitted to the heat exchange tube 3, the hammering force can be transmitted without damaging the outer peripheral surface of the heat exchange tube 3.
Therefore, adhesion of scales can be prevented and the sample fluid can be efficiently cooled without shortening the life of the heat exchange tube 3 and further the life of the sample fluid cooling device 1 due to damage to the outer peripheral surface.

In the above embodiment, the knocker 21 is
The knocker rod 25 is always contracted to separate the tip end surface of the knock portion 23 from the impact force transmitting portion 22, and when the impact force is generated, the knocker rod 25 is extended to generate the impact force. Is not limited to this. For example, in the knocker 21, the knocker rod 25 is constantly extended so that the tip of the knock portion 23 abuts on the rod 32 of the impact force transmission portion 22,
When a force is generated, the knocker rod 25 is contracted and then expanded again to cause the knock portion 23 to collide with the rod 32,
You may make it generate a strike force. In this way, when the knocker 21 constantly urges the rod 32 of the hammering force transmitting portion 22, the rod 32 is not accidentally separated from the heat exchange tube 3 and the hammering force is transmitted. There is no risk of damaging the surface of the heat exchange tube 3. The rod 3
Alternatively, one end of an urging member such as a spring may be locked to the spring 2, and the tip of the rod 32 may be constantly urged to the surface of the heat exchange tube 3 by the urging force of the urging member.

Further, the casing 2 in the above embodiment
The shape of the heat exchange tube 3 does not limit the sample fluid cooling device in the present invention. For example, it may be a sample fluid cooling device including a meandering heat exchange tube in a hollow casing.

Further, in the above embodiment, the hammering device 4 is applied to the vibrating mechanism to vibrate the heat exchange tube 3 by transmitting the impact force to the heat exchange tube 3, but the present invention is not limited to this. Absent. For example, a piezoelectric vibrator is used as a vibrating mechanism, the vibrating end of this piezoelectric vibrator is connected to a heat exchange tube, and an electric load is applied to the piezoelectric vibrator to generate vibration, thereby vibrating the heat exchange tube. May be.

[0033]

As described above, the present invention has the following effects. According to the invention of claim 1, since the vibrating mechanism for vibrating the heat exchange tube in the casing is provided, the scale adheres to the outer peripheral surface of the heat exchange tube during heat exchange between the sample fluid and the cooling fluid. Can be prevented, and the attached scale can be easily peeled off.

According to the invention of claim 2, since the vibration mechanism is provided near the sample fluid upstream side of the heat exchange tube in the casing, the vibration mechanism is the sample fluid of the heat exchange tube in the casing. The impact force can be applied to the upstream side, and the impact force can be applied to a portion where the temperature difference between the sample fluid and the cooling fluid is large and the scale easily adheres. Therefore, it is possible to more effectively prevent the scale on the outer peripheral surface of the heat exchange tube from attaching.

According to the third aspect of the present invention, the vibrating mechanism includes an impact source for generating an impact force, and an impact force transmission section for transmitting the impact force generated from the impact force source to the heat exchange tube. Since the heat exchange tube is vibrated by the impact force transmitted from the impact force transmission section, it is possible to prevent the scale from adhering to the heat exchange tube by using the vibration mechanism having a simple structure.

According to the invention of claim 4, the strike force transmitting section is
It consists of a shaft seal part provided in the opening formed in the casing and a rod that can move in the shaft seal part while facing the outer peripheral surface of the heat exchange tube with the tip facing the outer peripheral surface of the heat exchange tube. Since it abuts and transmits the striking force,
The impact force can be transmitted without damaging the outer peripheral surface of the heat exchange tube. Therefore, scale adhesion can be prevented without shortening the life of the sample fluid cooling device.

[Brief description of drawings]

FIG. 1 is a front sectional view of a sample fluid cooling device according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of a sample fluid cooling device according to an embodiment of the present invention.

[Explanation of symbols]

1 Sample fluid cooling device 2 casing 2a opening 3 heat exchange tubes 3a Outer spiral part 3b Inner spiral part 4 Hammering device (vibration mechanism) 6 torso 7 Tip side lid 8 Base side lid 9 First partition 10 Second partition pipe 12 First communication port 13 Second communication port 14 Cooling fluid inlet 15 Cooling fluid outlet 17 Sample fluid inlet 18 Sample fluid outlet 21 knocker (power source, air cylinder) 22 Power transmission unit 24 bracket 25 Knocker rod (cylinder rod) 26 Air supply piping 27 knocker operation panel 31 Shaft seal part 31a insertion hole 31b packing 32 rod

Claims (4)

[Claims] 1. A sample fluid comprising a hollow casing for passing a cooling fluid into an internal space and a heat exchange tube provided in the internal space of the casing, wherein the sample fluid is passed through the heat exchange tube and cooled by the cooling fluid. A sample fluid cooling device, wherein the cooling device is provided with a vibrating mechanism for vibrating the heat exchange tube in the casing. 2. The sample fluid cooling device according to claim 1, wherein the vibration mechanism is provided near the sample fluid upstream side of the heat exchange tube in the casing. 3. The vibrating mechanism includes a force generation source that generates a force and a force transmission unit that transmits the force generated from the force generation source to the heat exchange tube. 3. The heat exchange tube is vibrated by the hammering force transmitted from the transmission part.
The sample fluid cooling device according to item 1. 4. The striking force transmission section includes a shaft sealing section provided in an opening formed in the casing, and a rod movable in the shaft sealing section with its tip facing the outer peripheral surface of the heat exchange tube. The sample fluid cooling device according to claim 3, wherein the tip of the rod is brought into contact with the outer peripheral surface of the heat exchange tube to transmit the impact force.