JPH08136167A - Heat exchanger - Google Patents

Abstract

PURPOSE: To obtain a heat exchanger in which the installing area can be reduced by providing a plenum forming drum extended in the vertical direction along the outer periphery of a body drum, and so forming as to recover primary fluid from the upper part of the forming drum. CONSTITUTION: A plenum forming drum 25 is provided on the outer periphery of the intermediate site of a body drum 24, a primary fluid recovery channel 27 is formed between the drums 24 and 25, and a primary fluid outlet nozzle 8 is provided at the upper end of the channel 27. The primary fluid (a) supplied to the nozzle 8 flows from the upper side toward the lower side in a heat exchange chamber 14, and secondary fluid (b) supplied to a secondary fluid inlet nozzle 18 flows to a heat transfer tube 13 via a secondary fluid inlet chamber 17, and flows from the lower side toward the upper side in the tube 13. In this case, the fluid (a) is heat exchanged with the fluid (b) via the tube 13. The fluid (a) lowered at its temperature rises from the chamber 14 in the channel 27, and flows out via a primary fluid outlet nozzle 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space-saving heat exchanger.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional straight tube heat exchanger.

Reference numeral 1 denotes a cylindrical main body cylinder extending substantially vertically, and a bellows-like thermal expansion absorbing structure portion 2 which is vertically expandable and contractible is formed at a lower end portion of the main body cylinder 1.

Further, the main body 1 is supported by a fixed structure 4 such as a frame via a skirt 3 provided in the longitudinally intermediate portion of the outer peripheral surface thereof.

A cylindrical upper flow path forming member 5 is provided at the upper end of the main body cylinder 1 and extends in the up-down direction in succession to the main body cylinder 1. Also, at the lower end of the main body cylinder 1, the main body cylinder 1 is provided. A cylindrical lower flow path forming member 6 is provided so as to extend continuously downward.

Reference numeral 7 denotes a tubular upper plenum forming member,
The upper plenum forming member 7 is fixed to the upper end portion of the main body 1 at a predetermined distance from the outer peripheral surface of the upper flow passage forming member 5 and so as to surround the upper flow passage forming member 5 in the circumferential direction. Has been done.

The upper plenum forming member 7 is provided with a primary fluid inlet nozzle 8 so as to face the upper flow passage forming member 5.

Reference numeral 9 denotes a tubular lower plenum forming member,
The lower plenum forming member 9 is fixed to the lower end portion of the main body 1 so as to surround the lower flow passage forming member 6 in the circumferential direction at a predetermined distance from the outer peripheral surface of the lower flow passage forming member 6. Has been done.

The lower plenum forming member 9 is provided with a primary fluid outlet nozzle 10 so as to face the lower flow passage forming member 6.

11 is an upper tube sheet, 12 is a lower tube sheet,
The upper tube sheet 11 is fixed so as to be inscribed in the upper end portion of the upper plenum forming member 7, and the lower tube sheet 12 is fixed so as to be inscribed in the lower end portion of the lower plenum forming member 9.

Reference numeral 13 denotes a plurality of heat transfer tubes extending substantially vertically. The heat transfer tube 13 has an intermediate portion at the inner peripheral surfaces of the body barrel 1, the upper plenum forming member 7, and the lower plenum forming member 9, respectively. It is arranged inside a heat exchange chamber 14 formed by the lower surface of the upper tube sheet 11 and the upper surface of the lower tube sheet 12, the upper end portion of which penetrates the upper tube sheet 11, and the lower end portion of the lower tube sheet 12. Penetrates.

An intermediate portion of the heat transfer tube 13 is supported on the inner peripheral surface of the main body 1 by a baffle plate 15.

A lower mirror 16 is fixed to the lower end of the lower plenum forming member 9 so as to cover the lower tube sheet 12 from the lower side.

The lower mirror 16 has a secondary fluid inlet nozzle 18 for communicating the secondary fluid inlet chamber 17 formed by the inner surface of the lower mirror 16 and the lower surface of the lower tube sheet 12 with the outside of the lower mirror 16. Is provided.

Reference numeral 19 is an upper mirror, and the upper mirror 19 is fixed to the upper end portion of the upper plenum forming member 7 so as to cover the upper tube sheet 11 from above.

This upper mirror 19 has a secondary fluid outlet chamber 21 formed by the inner surface of the upper mirror 19 and the upper surface of the upper tube sheet 11 and a secondary fluid outlet nozzle 21 for communicating the outside of the upper mirror 19. Is provided.

Reference numeral 22 denotes a primary fluid recovery conduit (see FIG. 3 which will be described later).
Secondary sodium recovery pipeline), and the primary fluid recovery pipeline 22 is connected to the primary fluid outlet nozzle 10.

When heat is exchanged between the primary fluid a and the secondary fluid b by the straight pipe heat exchanger having the above-mentioned structure, the high temperature primary fluid a is supplied to the primary fluid inlet nozzle 8. At the same time, the low temperature secondary fluid b is supplied to the secondary fluid inlet nozzle 18.

The primary fluid a supplied to the primary fluid inlet nozzle 8 circulates in the heat exchange chamber 14 from the upper side to the lower side, and the secondary fluid b supplied to the secondary fluid inlet nozzle 18. Flows into the heat transfer tube 13 through the secondary fluid inlet chamber 17 and flows through the inside of the heat transfer tube 13 from the lower side to the upper side.

At this time, heat exchange is performed between the primary fluid a and the secondary fluid b via the heat transfer tube 13, so that the temperature of the secondary fluid b rises and the temperature of the primary fluid a falls.

Further, the secondary fluid b whose temperature has risen flows out from the secondary fluid outlet chamber 20 through the secondary fluid outlet nozzle 21 to the outside, and the primary fluid a whose temperature has dropped is the heat exchange chamber 1
4 to the outside through the primary fluid outlet nozzle 10.

When such heat exchange is performed, the main body cylinder 1 in which the high temperature primary fluid a flows, the low temperature secondary fluid b in the inside, and the outside contact the high temperature primary fluid a. An expansion difference occurs due to thermal expansion with the heat transfer tube 13, and this expansion difference is absorbed by the thermal expansion absorption structure portion 2 of the main body cylinder 1.

FIG. 3 shows an example of a fast breeder reactor using the straight tube heat exchanger shown in FIG. 2 as the steam generator 23.

Reference numeral 30 denotes a reactor main body (fast breeder reactor main body), and inside the reactor main body 30, there is a core 3 which is a heat source.
No. 1 is filled with sodium (Na) (primary) as a coolant.

Reference numeral 32 denotes an intermediate heat exchanger body, and the inside of the intermediate heat exchanger body 32 is filled with sodium (primary), and a heat transfer device 33 is provided. The inside of this heat transfer device is filled with sodium (secondary).

Reference numeral 34 is a primary sodium supply line, and the primary sodium supply line 34 is the reactor main body 30.
Is configured to transfer sodium (primary) from the inside to the inside of the intermediate heat exchanger body 32.

Reference numeral 35 is a primary sodium recovery pipeline, and the primary sodium recovery pipeline 35 is configured to transfer sodium (primary) from the inside of the intermediate heat exchanger body 32 to the inside of the reactor body 30. ing.

Reference numeral 36 denotes a secondary sodium supply pipe line. The secondary sodium supply pipe line 36 is a fluid outlet of the heat transfer device 33 and a primary fluid inlet of the steam generator 23 (a straight pipe type shown in FIG. 2). It is configured to be connected to the primary fluid inlet nozzle 8) of the heat exchanger and to supply sodium (secondary) from the inside of the heat transfer device 33 to the steam generator 23 as the primary fluid a shown in FIG. There is.

Further, at the fluid inlet of the heat transfer device 33, secondary sodium recovery communicating with the primary fluid outlet of the steam generator 23 (the primary fluid outlet nozzle 10 of the straight pipe type heat exchanger shown in FIG. 2) is recovered. Pipe line (primary fluid recovery pipe line shown in FIG. 2) 2
2 is connected.

When steam is generated by using the fast breeder reactor having the above-mentioned structure as a heat source, the core 3 of the reactor body 30 is used.
The sodium (primary) in the reactor body 30 that has become hot after cooling 1 is transferred to the intermediate heat exchanger body 32 via the primary sodium supply pipe 34.

The sodium (primary) transferred to the intermediate heat exchanger body 32 flows down along the outer periphery of the heat transfer device 33 provided inside the intermediate heat exchanger body 32, and the sodium (primary) flows through the heat transfer device 33. The heat is exchanged with sodium (secondary) filled in the heat transfer device 33 via the heat transfer device 33.

At this time, the temperature of sodium (secondary) increases and the temperature of sodium (primary) decreases. Sodium (secondary) whose temperature has risen is the heat transfer device 33.
Of the sodium (primary fluid inlet nozzle 8 of the straight-tube heat exchanger shown in FIG. 2) transferred to the primary fluid inlet of the steam generator 23 from the fluid outlet of the secondary sodium supply pipe 36. ) Is from the inside of the intermediate heat exchanger body 32 via the primary sodium recovery pipe 35.
0 is transferred to the inside.

Further, sodium (secondary) transferred to the primary fluid inlet of the steam generator 23 flows through the inside of the heat exchange chamber 14 shown in FIG. 2 from the upper side to the lower side, and also shown in FIG. It is supplied to the secondary fluid inlet nozzle 18 and flows into the heat transfer tube 13 through the secondary fluid inlet chamber 17,
Secondary fluid b flowing from the lower side to the upper side in the inside of the
(For example, water supplied from a turbine condenser for driving a generator (not shown)) and heat exchange via the heat transfer tube 13,
While the temperature of the secondary fluid b is increased to generate steam, the temperature of the sodium (secondary) is decreased.

The secondary fluid b which has become the above-mentioned steam is shown in FIG.
From the secondary fluid outlet chamber 20 shown in FIG.
And is fed to an external device (for example, a generator driving turbine (not shown)).

The sodium (primary) transferred to the inside of the reactor body 30 acts to cool the core 31 again.

[0036]

However, in the above-described steam generator 23 (straight tube heat exchanger), when the secondary sodium recovery pipeline (primary fluid recovery pipeline shown in FIG. 2) 22 is damaged. In order to prevent the total amount of sodium (secondary) inside the intermediate heat exchanger body 32 from flowing out from the damaged portion, the secondary sodium recovery pipe line 22 is placed above the intermediate heat exchanger body 32. I am trying to install it.

Therefore, it is necessary to raise the secondary sodium recovery pipe line 22 in the vicinity of the steam generator 23 substantially vertically, and the installation area of the steam generator 23 tends to increase.

In view of the above situation, the present invention provides a plenum forming cylinder extending in the vertical direction along the outer periphery of the main body cylinder, and forms the primary fluid from the upper portion of the plenum forming cylinder so as to collect the primary fluid. The purpose is to provide a heat exchanger capable of reducing the installation area.

[0039]

To achieve the above object, in a heat exchanger according to the present invention, a cylindrical main body cylinder extending substantially vertically and a lower portion of the main body cylinder are provided near an upper end of the main body cylinder. A cylindrical plenum forming cylinder which is arranged so as to surround in the circumferential direction up to and has an upper end fixed to the outer peripheral surface of the main body cylinder, an upper plenum forming member fixed to the upper end of the main body cylinder, and the upper plenum. An upper tube plate fixedly inscribed to the upper end of the forming member, a lower tube plate fixedly inscribed to the lower end of the plenum forming cylinder, and an upper end portion penetrating the upper tube plate and a lower end. A substantially vertically extending heat transfer tube disposed inside the main body so that the portion penetrates the lower tube sheet;
A lower mirror fixed to the lower end of the plenum forming cylinder so as to cover the lower tube sheet from below, and an upper mirror fixed to the upper end of the upper plenum forming member so as to cover the upper tube sheet from above. A primary fluid inlet nozzle provided on the upper plenum forming member, a primary fluid outlet nozzle provided near the upper end of the plenum forming cylinder, and a secondary fluid inlet nozzle provided on the lower mirror. And a secondary fluid outlet nozzle provided on the upper mirror.

[0040]

In the heat exchanger of the present invention, when the high temperature primary fluid is supplied to the primary fluid inlet nozzle and the low temperature secondary fluid is supplied to the secondary fluid inlet nozzle, the primary fluid supplied to the primary fluid inlet nozzle Flows from the upper side to the lower side in the heat exchange chamber, and the secondary fluid supplied to the secondary fluid inlet nozzle flows into the heat transfer tube through the secondary fluid inlet chamber, It flows through the inside of the heat pipe from the lower side to the upper side, heat is exchanged between the primary fluid and the secondary fluid via the heat transfer tube, the temperature of the secondary fluid rises, and the temperature of the primary fluid rises. descend.

Furthermore, the secondary fluid whose temperature has risen flows out from the secondary fluid outlet chamber to the outside through the secondary fluid outlet nozzle, and the primary fluid whose temperature has dropped from the heat exchange chamber to the primary fluid recovery passageway. Through the primary fluid outlet nozzle.

[0042]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view schematically showing an embodiment of the heat exchanger of the present invention. In the figure, the parts denoted by the same reference numerals as those in FIG. 2 represent the same things.

Reference numeral 24 denotes a cylindrical main body cylinder extending substantially vertically, 2
Reference numeral 5 denotes a cylindrical plenum forming cylinder extending substantially vertically, and a bellows-shaped thermal expansion absorbing structure portion 26 that is vertically expandable and contractible is formed at a lower end portion of the plenum forming cylinder 25.

The plenum forming cylinder 25 has a main body so that a primary fluid recovery flow passage 27 is formed between the inner peripheral surface of the plenum and the outer peripheral surface of a portion of the main body cylinder 24 below the vertically intermediate portion. The upper and lower ends of the body 24 are fixed to the outer circumferential surface of the main body 24 so as to surround the lower portion of the body 24 in the circumferential direction.

In the vicinity of the upper end of the plenum forming cylinder 25, a primary fluid outlet nozzle 28 is provided which connects the primary fluid recovery flow path 27 and the outside of the plenum forming cylinder 25.

Further, the plenum forming cylinder 25 is supported by a fixed structure 4 such as a frame via a skirt 3 provided in the longitudinally intermediate portion of the outer peripheral surface thereof.

Outer peripheral surface of main body cylinder 24 and plenum forming cylinder 25
An anti-sway member 29 is provided at an appropriate position between the inner peripheral surface of the main body cylinder 24 and the inner peripheral surface thereof so that relative displacement between the main body cylinder 24 and the plenum forming cylinder 25 is suppressed. Has become.

At the upper end of the body barrel 24, a cylindrical upper flow path forming member 5 is provided which is continuous with the body barrel 24 and extends vertically.

Reference numeral 7 is a cylindrical upper plenum forming member,
The upper plenum forming member 7 is fixed to the upper end portion of the body barrel 24 at a predetermined distance from the outer peripheral surface of the upper flow passage forming member 5 and so as to surround the upper flow passage forming member 5 in the circumferential direction. The primary fluid inlet nozzle 8 is provided so as to face the upper flow path forming member 5.

11 is an upper tube sheet, 12 is a lower tube sheet,
The upper tube sheet 11 is fixed to the upper end portion of the upper plenum forming member 7 so as to be inscribed, and the lower tube sheet 12 is attached to the plenum forming cylinder 2.
It is fixed so as to be inscribed on the lower end portion of 5.

Reference numeral 13 denotes a plurality of heat transfer tubes extending substantially vertically. The heat transfer tube 13 has an intermediate portion at an inner peripheral surface of each of the main body cylinder 24, the upper plenum forming member 7 and the plenum forming cylinder 25, and an upper portion. Disposed inside the heat exchange chamber 14 formed by the lower surface of the tube sheet 11 and the upper surface of the lower tube sheet 12,
The upper end portion penetrates the upper tube sheet 11, and the lower end portion penetrates the lower tube sheet 12.

The intermediate portion of the heat transfer tube 13 is supported by the baffle plate 15 on the inner peripheral surface of the body case 24.

Reference numeral 16 is a lower mirror, and the lower mirror 16 covers the lower tube sheet 12 from the lower side.
Is fixed to the lower end of the.

The upper mirror 19 is fixed to the upper end of the upper plenum forming member 7 so as to cover the upper tube sheet 11 from above.

When heat exchange is performed between the primary fluid a and the secondary fluid b by the straight tube heat exchanger having the above-mentioned configuration, the high temperature primary fluid a is supplied to the primary fluid inlet nozzle 8. At the same time, the low temperature secondary fluid b is supplied to the secondary fluid inlet nozzle 18.

The primary fluid a supplied to the primary fluid inlet nozzle 8 flows through the inside of the heat exchange chamber 14 from the upper side to the lower side, and also the secondary fluid b supplied to the secondary fluid inlet nozzle 18. Flows into the heat transfer tube 13 through the secondary fluid inlet chamber 17 and flows through the inside of the heat transfer tube 13 from the lower side to the upper side.

At this time, the primary fluid a is passed through the heat transfer tube 13.
Heat is exchanged between the secondary fluid b and the secondary fluid b, and the temperature of the secondary fluid b rises and the temperature of the primary fluid a falls.

Further, the secondary fluid b whose temperature has risen flows out from the secondary fluid outlet chamber 20 through the secondary fluid outlet nozzle 21 to the outside, and the primary fluid a whose temperature has dropped is the heat exchange chamber 1
4, the primary fluid recovery channel 27 formed between the main body cylinder 24 and the plenum forming cylinder 25 rises, and then flows out through the primary fluid outlet nozzle 28.

When such heat exchange is performed, the plenum forming cylinder 25 in which the relatively high temperature primary fluid a flows and the low temperature secondary fluid b in the inside and the outside temperature of the relatively high temperature. Due to thermal expansion, a relatively small difference in expansion occurs with the heat transfer tube 13 that comes into contact with the primary fluid a, and this expansion difference is absorbed by the thermal expansion absorption structure 26 of the plenum forming cylinder 25.

In this embodiment, a plenum forming cylinder 25 is provided on the outer periphery of the intermediate portion of the main body cylinder 24, and a primary fluid recovery passage 27 is formed between the main body cylinder 24 and the plenum forming cylinder 25. Since the primary fluid outlet nozzle 28 is provided at the upper end of the recovery channel 27, the primary fluid recovery conduit 22 shown in the conventional example of FIG. 2 is unnecessary, and the installation area of the heat exchanger can be reduced. Since the thermal expansion absorbing structure portion 26 can be downsized by lowering the temperature of 24 and the skirt 3 is provided on the plenum forming cylinder 25, the structural soundness can be improved by lowering the temperature of the joining portion of the skirt 3. it can.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0063]

According to the heat exchanger of the present invention, various excellent effects as described below can be obtained.

I) The rising pipe of the conventional primary fluid recovery pipe is not required, and the installation area of the heat exchanger can be reduced.

II) The temperature difference between the heat transfer tube and the plenum forming cylinder is relatively small, and the thermal expansion absorbing structure can be downsized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an embodiment of a heat exchanger of the present invention.

FIG. 2 is a cross-sectional view schematically showing an example of a conventional heat exchanger.

FIG. 3 is a schematic view of an example of a fast breeder reactor using the heat exchanger shown in FIG. 2 as a steam generator.

[Explanation of symbols]

 7 Upper Plenum Forming Member 8 Primary Fluid Inlet Nozzle 11 Upper Tube Plate 12 Lower Tube Sheet 13 Heat Transfer Tube 16 Lower Mirror 18 Secondary Fluid Inlet Nozzle 19 Upper Mirror 21 Secondary Fluid Outlet Nozzle 24 Main Body 25 Plenum Forming Body 28 Primary Fluid Outlet nozzle

Claims (1)

[Claims] 1. A cylindrical main body cylinder extending substantially vertically, and a lower part of the main body cylinder is disposed so as to circumferentially surround the upper end of the main body cylinder, and the upper end portion is fixed to an outer peripheral surface of the main body cylinder. A tubular plenum forming cylinder, an upper plenum forming member fixed to the upper end of the main body cylinder, an upper tube plate fixed to the upper end of the upper plenum forming member so as to be inscribed, A lower tube sheet fixed so as to be inscribed in the lower end of the plenum forming cylinder, and a generally arranged inside of the main body cylinder so that the upper end portion penetrates the upper tube sheet and the lower end portion penetrates the lower tube sheet. A vertically extending heat transfer tube, a lower mirror fixed to the lower end of the plenum forming cylinder so as to cover the lower tube sheet from below, and an upper end of the upper plenum forming member so as to cover the upper tube sheet from above. The upper mirror fixed to the upper part and the above-mentioned upper plenum forming member. A primary fluid inlet nozzle provided,
A primary fluid outlet nozzle provided in the vicinity of the upper end of the plenum forming cylinder, a secondary fluid inlet nozzle provided in the lower mirror, and a secondary fluid outlet nozzle provided in the upper mirror. A heat exchanger characterized by the following.