JPS62245085A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide always a heat exchanging function to get an effective utilization of energy and at the same time to improve a rate of operation and reliability of an entire system by a method wherein three U-shaped tubes are arranged as a set of tube unit and a three-phase AC current is supplied to a central part of a U-shaped bent part of each of the tubes through a cable. CONSTITUTION:Cables 23u, 23v and 23w are connected so as to energize each of central portions 18u, 18v, 18w of a substantial U-shaped bent portion of each of tubes from each of the terminals of a terminal block 21. Each of the units of tube 18 becomes a three-phase AC star connection with the tube 18 being applied as a resistor. Each of the tubes 18 is insulated by a packing 7 and an insulation bushing 19 and an energizing position is located at a central part of a substantial U-shaped bent portion, so that each of the units shows a neutral point having a zero potential at a partition plate 4 and even if a plurality of units of tubes 18 are applied, the partition plate 4 shows a zero potential. Since a barrel 2 of a heat exchanger 1 shows a zero potential even in case of energizing the tube 18, there is no possibility of accident of an electric shock.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a heat exchanger, and in particular, it is capable of exchanging heat between fluids, and can also heat and cover a fluid to be heated with electricity. Regarding possible heat exchangers.

(Prior Art) Generally, when heating a certain fluid, a duplex type heat exchanger is often used.

In this tube type heat exchanger, for example, a fluid to be heated is circulated through a plurality of tubes, and a heat source side fluid having a temperature B higher than that of the fluid to be heated is placed on the body side in which the tubes are built. The heat exchanger is formed so that heat exchange is performed by causing the heat source side fluid to flow and preventing the thermal energy held by the heat source side fluid from being transferred to the heated fluid.

Many of these heat exchangers are used as one component in a complex system such as a nuclear power plant system.

(Problems to be Solved by the Invention) In the tube-type heat exchanger described above, in order to raise the temperature of the fluid to be heated, it is necessary to constantly feed the fluid on the heat source side into the body. be.

However, the fluid on the heat source side may leak, or the system for supplying the fluid on the heat source side cannot be operated.
When the heat source side fluid is fed to +S (4), the heat exchanger loses its heat exchange function. The system as a whole may become unable to operate, and there is a risk that a large number of losses will occur.

The present invention has been made in consideration of these points, and it is possible to constantly demonstrate heat exchange performance, and to aim for effective use of energy, and the entire system in which this heat exchanger is incorporated. The objective is to provide a heat exchanger that can improve the availability and reliability of the heat exchanger.

(Structure of the Invention) (Means for Solving the Problems) The present invention provides mutual heat exchange between a fluid flowing in a shell and a fluid flowing in a tube provided in the shell. The tubes are arranged as a duplex consisting of a set of three tubes formed in a substantially U-shape, and a cable is connected to the center of the U-shaped vent part of each tube. It is characterized by being supplied with three-phase alternating current through the

(Function) The heat exchanger of the present invention can perform two types of heat exchange. In other words, on the one hand, heat exchange can be performed between the fluid flowing inside the Ill and the fluid flowing inside the tube in the same manner as in a tube-type heat exchanger, and on the other hand, when the tube is energized, This allows the duplex to generate Joule heat to heat the fluid in the tube, which is the same heat exchange as in a so-called electric water heater.

Therefore, in the present invention, when the fluid is normally fed into the tube, the fluid in the tube can be heated or cooled as a normal L-tube heat exchanger, and some If for some reason it becomes impossible to feed the fluid into the tube, the fluid in the tube can be heated by Joule heat by energizing the tube.

Furthermore, in the heat exchanger of the present invention, since three-phase alternating current is supplied to the center of the U-shaped vent portion of each tube, the potential of the body of the heat exchanger becomes zero, so there is no risk of electric shock.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 to 3 show the configuration of the heat exchanger N1 of this embodiment, and FIG. 4 is a system diagram of a nuclear power plant system incorporating the heat exchanger 1 of this embodiment.

As shown in FIG. 1, the heat exchanger 1 of this embodiment is provided with a cylindrical body 2 in the center, and one end of the body 2 (
A tube-side housing 3 is fixed to the other end of the first body 2 (left end in the figure) with a partition plate 4 in between, and a terminal housing 5 is fixed to the other end (left end in the figure). There is. A movable partition plate 6 is provided at the end of the body 2 on the side of the terminal housing 5 so as to be movable in the longitudinal direction via a para-ring 7 that provides insulation. And this IN2
The fluid on the body side is prevented from flowing in the space surrounded by the partition plate 4 and the movable partition plate 6 at both ends thereof. The fluid is supplied from a shell-side inlet nozzle 8 provided at the upper end of the shell 2, and is discharged from a shell-side outlet nozzle 9. A plurality of baffle plates 10, 10, . . . are provided between the body-side inlet nozzle 8 and the body-side outlet nozzle 9, respectively. Further, a drain pipe 11 having a drain valve 12 is connected to the lower end of @2 to drain the internal fluid.

Moreover, the space formed by the partition plate 4 and the duplex side housing 3 is formed by a partition plate 1 provided horizontally at the center in the height direction.
3, the tube side inlet chamber 14 and the tube side outlet chamber 1
It is divided into upper and lower halves. One tube-side inlet chamber 14 is connected to a tube-side inlet nozzle 16 through which fluid to be distributed to the tube is fed, and the other tube-side outlet chamber 15 is connected to a tube-side outlet nozzle that prevents fluid from flowing out. 17 are connected. A plurality of horizontal substantially U-shaped tubes 18, 18... have their inlet ends opened into the tube-side inlet chamber 14, and a plurality of baffle plates 10, 10... and movable partition plates are inserted in the middle. 6 so that the first protruding end opens into the tube side outlet chamber 15. Each tube 18 has an inlet end and an outlet end fixed to the partition plate 4, and the other end to the movable partition plate 6.
It is fixed and supported. Deformation due to thermal expansion and contraction of each tube 18 is caused by moving the movable partition plate 6 through the backing 7.
112 so as to be movably attached thereto.

Each tube 18 is insulated through an insulating pusher 119 at the penetrating portion of each baffle plate 10 and is supported so as to be relatively movable.

In the terminal chamber 20 formed by the terminal housing 5 and the movable partition plate 6 in which the substantially U-shaped vent portion of each tube 18 exists, a terminal is provided as a power supply mechanism for supplying power to each tube 18. A stand 21 is provided and no fluid is supplied. In this embodiment, three-phase alternating current is applied to the tube 18, and as shown in FIG.
A plurality of sets are provided as units 1-. Terminal block 21
Cables 22u and 22v supply three-phase alternating current from power supply equipment (not shown) such as a transformer.

22w is connected, and from each terminal of the terminal block 21, a medium heat section 18u of the approximately U-shaped vent part of each duplex 18,
Cable 23 to supply power to 18v and 18w respectively
u, 23V, and 23w are connected respectively. As a result, each unit of the tube 18 has a three-phase AC current using the tube 18 as a resistor, as shown in FIG. It will be considered as a form connection. Each tube 18 is insulated along its length by the backing 7 and the insulating bushing 19, and the positions where electricity is applied are the central portions 18u, 18v, and 18w of the approximately U-shaped vent portion, so that the tube Each of the 18 units becomes a neutral point of zero potential at the partition plate 4 portion. Therefore, even if there are a plurality of tube units 18, the potential of the partition plate 4 will eventually become zero. Also,
As a result, the potential of the shell 2 of the heat exchange window 1 is zero even while the tube 18 is energized, so there is no fear of electric shock and the operation can be carried out extremely safely.

Next, the operation of this embodiment will be explained.

For example, when heating the fluid flowing in the tube 18, in the same manner as in a normal tube heat exchanger, first, the heat source side, which is higher temperature than the fluid to be heated, is heated in the tube 342. Fluid is supplied through the shell side inlet nozzle 8. In this case, the drain valve 12 of the drain pipe 11 connected to the bottom of the 1N2 is kept fully open, and the heat source side fluid that has flowed into the shell 2 from the shell side inlet nozzle 8 is channeled into the IIH2 by each baffle plate 10. It is made to flow in a zigzag pattern up and down, and is refluxed from the body side outlet nozzle 9 to the heat source side. In this state, the fluid to be heated is fed into the tube-side inlet chamber 14 through the tube-side inlet nozzle 16 . As a result, the fluid to be heated flows into each tube 18, is heated by the heat source fluid while moving leftward inside the shell 2 in FIG. As it travels to the right in the barrel 2, it is heated by the heat source fluid, heated to a predetermined temperature, flows into the tube side outlet chamber 15, and is sent to the system via the tube side outlet nozzle 17. .

In addition, if the heat source side fluid cannot be fed into the shell 2, for example, if an accident such as a leakage of the heat source side fluid occurs,
Each cable 22u, 22 from the power supply equipment (not shown)
The central portion 18LJ of the tube 18 is connected to the terminal block 21 in the terminal chamber 20 through the cables 23u, 23V, and 22w to form each unit of the three tubes 18, Electrify to 18V, 18W. As a result, Joule heat is generated in each tube 18, and the heated fluid flowing through the tube 18 is heated to a predetermined temperature. In this case, to adjust the humidity of the fluid to be heated, the power supplied to each tube via the power supply structure, for example, the current applied, is 1i11111
It is done by doing.

In this manner, the heat exchanger 1 of this embodiment can perform heat exchange as a normal tube-type heat exchanger, and can also perform heat exchange as an electric water heater in which the tubes 18 are energized. Therefore, the fluid to be heated can always be heated to a predetermined temperature.

4. In this embodiment, the heat medium supplied into the shell 2 is not only hot water, but also natural air.

In addition, the heat exchanger 1 of this embodiment supplies refrigerant into the shell 2 during normal operation, cools the fluid flowing inside each tube 18, and cools the fluid flowing through the tubes 18 as necessary. Ill?
It can also be used when heating the fluid flowing inside the tube 18 by 'J'.

Furthermore, the heat exchanger 1 of this embodiment is suitable for cases where the heat source side fluid is insufficient in 1. In addition to heat exchange with the fluid on the heat source side, electric power can be supplied to perform a heating effect using Joule heat.

FIG. 4 shows an example in which the heat exchanger 1 of the embodiment according to the present invention is applied to a nuclear power plant system, and the structure and operation thereof will be explained below.

In the tubes 18 of the heat exchanger 1, hot water, which is a fluid to be heated, flows. In other words, hot water is sent from the boob side outlet 1 chamber 15 through the piping system 24 to the heating air conditioning equipment 25 in the power plant. This hot water can be used for air conditioning! ! A-airflow is generated inside the +25 to heat various parts of the power plant. This air conditioning i[25
The hot water that exits is cooled and returns to the duplex side inlet chamber 1/I of the heat exchanger 1 via the pump 26.

On the other hand, a high-temperature heat source side fluid flows in the shell 2 of the heat exchanger 1. This heat source side fluid flows through the heat exchanger 1.
After being cooled by exchanging heat with the fluid flowing in the tube 18, it is sent to another heat exchanger 28 by a pump 27, where it is completely cooled to room temperature (approximately 10 degrees Celsius), and then reactor cooling. It is sent to the material purification system heat exchanger 29, where it cools a portion of the reactor cooling water, and returns to the heat exchanger 1 again (while being heated itself).

To explain further, the reactor coolant purification system heat exchanger 29 is
During operation of the power plant, reactor water is fed from the reactor to the tube side (not shown) through the inlet pipe 29a through the cooling water pipe 30 to the cooling water fed to the 1 (1 side).
: It is cooled and transferred to the purification device through the outlet pipe 29b. The shell side fluid (cooling water) flowing out from the heat exchanger 29 to the cooling water pipe 31 has a considerably high temperature of 60 to 70°C.
). Therefore, in this embodiment, this shell-side fluid is guided into the shell 2 of the heat exchanger 1 as a heat source-side fluid through the cooling water pipe 31, and the thermal energy held by this shell-side fluid is used to air condition the air conditioner in the power plant. equipment 25 is in operation.

However, nuclear power plants are required by law to undergo annual inspection once a year, and during this period (2 to 3 months)
It is necessary to shut down the reactor. Therefore, the temperature of the heat source fluid flowing through the shell 2 side of the heat exchanger 1 is high (60 to 70 degrees Celsius) during operation of the power plant, but during the annual inspection it is always N
(10°C). On the other hand, y! ! Since it is necessary to operate the air conditioning unit 25 even during inspection of the power station (while the reactor is shut down), especially in the winter, a thermal energy supply source is provided in place of the heat source fluid on the IH2 side in the heat exchanger 1. It is necessary to secure it.

Therefore, in the heat exchanger 1 of this embodiment, the cable 2 is connected to the sea urchin tube 18 from the power supply equipment 32 as described above.
2u, 22V, 22W%Q slave stand 21 and cable 23
The duplex 18 is configured to allow current to flow through the duplexes 18, 23v, 23w, etc. to heat the fluid in the duplex 18 using Joule heat.

In actual operation, during power plant operation, the drain valve 12 of the heat exchanger 1 is closed, the inlet valve 33 and the outlet valve 34 are opened, and the power supply to the other tube 18 is stopped.
By flowing fluid to the 2 side and the tube 18 side, the heat exchanger 1 is used as a so-called tube-type heat exchanger. When the power plant stops, the drain valve 12
The inlet valve 33 and outlet valve 34 are opened, the inlet valve 33 and the outlet valve 34 are closed, the fluid in the shell 2 is discharged, and a current is passed from the power supply equipment 32 to the tube 18 via the power supply equipment. The fluid in the duplex 18 is heated while avoiding generation of Joule heat.

In this way, according to this embodiment, the conventional so-called tube-type heat exchanger can also be used as an electric water heater, so even if the thermal energy side, that is, the high-temperature heat source side fluid cannot be used, the electric water heater can be used. If used as a heat exchanger, thermal energy can always be transferred to the heated fluid. In addition, since a single heat exchanger can easily heat or cool a certain fluid, energy can be used effectively, and the overall system incorporating the exchanger can be operated more efficiently and reliably. You can improve your sexual performance.

〔Effect of the invention〕

As described above, according to the heat exchanger of the present invention, it is possible to always perform the heat exchange function, and also to make effective use of energy, which improves the operating rate of the entire system in which this heat exchanger is incorporated. Reliability can be improved.

[Brief explanation of drawings]

1 to 3 show an embodiment of the heat exchanger of the present invention, FIG. 1 is a longitudinal sectional side view thereof, and FIG.
A cross-sectional view along the line, Figure 3 is a circuit diagram for energizing three-phase AC to three wooden tubes, and Figure 4 is a nuclear power generation plan 1 incorporating the heat exchanger of the present invention as one component. ~It is a system diagram showing the system. 1... Heat exchanger, 2... Body, 4... Partition plate, 6...
...Movable partition plate, 10...Baffle plate, 18...Tube, 19...Insulation pusher 1.20...Terminal chamber, 21
...Terminal block, 22U, 22V, 22W, 23LJ, 2
3V, 23W...cable.

Claims (1)

[Claims] 1. In a heat exchanger that mutually exchanges heat between a fluid flowing in a body and a fluid flowing in a tube provided in the body, the tube is formed in a substantially U-shape.
A heat exchanger characterized in that the heat exchanger is arranged as a tube unit consisting of a set of tubes, and three-phase alternating current is supplied to the center of the U-shaped vent portion of each tube via a cable.