JPS5993193A - High temperature heat exchanger - Google Patents

Abstract

PURPOSE:To avoid misalignment of a heat transfer pipe with a bush by a method wherein the bush is applied with a pre-load through a leaf spring so that the heat transfer pipe comes into contact with the entire support and contact surface of the bush under uniform pressure. CONSTITUTION:The bush 4 wound around the outer periphery of the heat transfer pipe 1 is provided with a single recess 4a and a corrugated heat resistant leaf spring 5 is wound around the bush 4. Further, a sleeve 6 is press-fitted into a support plate 3 and held stationary and the leaf spring 5 wound around the bush 4 so as to cover the latter is inserted into the sleeve 6 from the bell- mouthed side of the latter. Accordingly, the leaf spring 5 is sandwiched between the sleeve 6 and the bush 4 and the bush 4 comes into contact with the outer peripheral surface of the heat transfer pipe 1 under a predetermined contact surface pressure due to the shrinkage margin of the leaf spring 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high temperature heat exchanger, and more particularly to an improvement in a mechanism for supporting heat exchanger tubes.

The heat generated by nuclear fission in a nuclear reactor is absorbed by helium gas, this heated helium gas is guided to a steam generator to obtain steam, and the steam produced here is used for power generation.
Alternatively, it can be used as a raw R-furnace that produces high-temperature hydrogen through an intermediate heat exchanger and uses it for reduction iron making. IX;! Gas furnaces are known. Since the helium gas is radioactive, its thermal energy is transferred to a secondary medium via a high-temperature heat exchanger, and this secondary medium is used for power generation or the like. As this secondary medium, steam, hydrogen gas, helium gas, etc. are used depending on the purpose.

In order to increase the heat transfer efficiency from the primary medium to the secondary medium,
It is necessary to make the length of the heat exchanger tube of the heat exchanger sufficiently long. Therefore, in order to support the heat exchanger tube's own weight and suppress vibration, it is necessary to support the heat exchanger tube midway.

Figure 1 shows the support structure of heat exchanger tubes in a conventional heat exchanger, where (1) is a heat exchanger tube, (2) is a sleeve, and (3) is a heat exchanger tube.
) is the support plate. In this way, the heat exchanger tube (1) is loosely inserted into the cylindrical sleeve (2) with some allowance, and is held by fitting the sleeve (2) to the support plate (3). -1, although not shown, the heat exchanger tube flit
:1 Because it is necessary to arrange them closely, adjacent tubes are arranged close to each other so as to maintain a certain distance to the extent that they do not touch each other, and the support plate (3) also serves as a positioning member. ing.

In such a heat exchanger, heliuno gas, which is a primary medium heated to high fH, flows through the furnace through the outside of the heat exchanger tube (11), and the low-temperature secondary medium flows through the inside of the heat exchanger tube (11). As the medium flows, the heat of the primary medium is transferred to the secondary medium through the tube wall of the heat conductive material (1). Therefore, 2θ (if the medium is steam, this is different from superheated steam) It is sent to Scoom Turbi, where it is used to generate electricity and becomes Rukoyo.

1 for this heat transfer tube (1), and 1.0 tl during reactor operation.
Since the temperature is close to 10° C., slippage occurs in the supporting coil portion due to elongation due to thermal expansion. Due to the flow of gas, which is a primary medium flowing at high speed across the heat transfer tube (1), a PuJolzmann vortex is generated, which causes the heat transfer tube (1) to undergo fluid vibrations. of·
This will cause slippage and wobbling in the support portion.

In addition, the heat exchanger tube (1) is made of a Nj-based alloy or superalloy with high acid resistance and surface oxidation resistance so that it can be heated to a high temperature of 1,000°C. These metals) are likely to cause metal adhesion on the support unless an oxide film is formed on the surface of the metal in the -\Liu J, force. Therefore, this metal adhesion is avoided. In order to
It is coated with a ceramic spray coating.

By the way, the conventional heat exchanger tube support mechanism as described above has the following drawbacks.

However, since the hole diameter of the sleeve (2) is made somewhat larger than the outer diameter of the heat transfer tube (1), play will occur between the two. Due to this misalignment between the heat exchanger tube (1) and the sleeve (2), the end of the sleeve (2) has uneven contact, resulting in locally excessive blood pressure and abnormalities in some uneven contact areas. Causes wear. Further, due to the play between the heat transfer tube (1) and the sleeve (2), fatigue cracks occur in the coated portion of the ceramic sprayed material due to repeated twisting. All of these significantly reduce the reliability of the high-temperature heat exchanger and shorten its lifespan.

The present invention aims to eliminate the above-mentioned drawbacks.

The purpose is to improve the reliability of the high-temperature heat exchanger and to extend the life of the high-temperature heat exchanger. 491j
is explained in ii-'l'#IIl with reference to Igl mi.
'91 (-J- That is, heat transfer (shown by partially cutting out the support bar 1111 of HfH 7)) This is a view from f1, and in the figure (1
) is a heat transfer layer similar to the conventional one; As shown in the figure, it is shaped like a cylinder with one instep (4a) extending in the axial direction. In addition, this + JJ missing (4a)
is provided so that it can be changed according to the thermal expansion of the heat exchanger tube (1), and does not necessarily have to be in accordance with Nil Bu 51, for example, It may be 9 digits.

(5) is a heat-resistant plate O: 12 in the shape of a corrugated iron, and is provided in such a way that a band-shaped material can be wrapped around the top of (4) as shown in Figure 4. (6)
is a snob, and as shown in Figure 5, there is a boxwood (
6; 1) It has a cylindrical shape 7, and this boxwood (6a
) (The inner surface of III is formed into a bell mouth shape, and is provided with a light -1--pa that becomes smaller in diameter from the brim (6a) side to the other end. It's a sword (3
) is the same 1 child 6 support plate as the conventional one.

Now, the sleeve (6) is press-fitted (7) into the support plate (3). The outer circumferential surface of the heat exchanger tube (1) and the inner circumferential surface of the fuselage tube (4) are coated with ceramic in advance.
The heat exchanger tube (4) has a natural diameter that is slightly thicker than the diameter of the heat exchanger tube (1). θ (Ide, the plate i2 (51) wrapped around Buso/Ko (4)
Insert from the bell mouth side. Therefore, the leaf spring (5) is inserted between the sleeve (6) and the bushing (4), and the bushing (4) has a leaf i2 (51
The heat exchanger tube (11) is brought into contact with the outer peripheral surface of the heat exchanger tube (11) so as to apply a predetermined contact pressure to the outer peripheral surface of the heat exchanger tube (11).

In the present invention, as described in Section 2, 4 pieces of Kolge-1.
:Since it is made of +111 structure which gives Brillo 1・' to Buso/Yu (4) through Ne (5), the heat transfer tube (1) and Butu/Yu (4) are supported (concubine angle: the surface is the entire surface). The contact surface pressure of the fin/unit (4) is: Bush (4)
It is possible to achieve a predetermined strength by appropriately designing the plate thickness of ), the thickness of J2 (5), and the shrinkage margin.

When the transmission tube (1) is heated by high-temperature helium gas, the tube diameter force increases due to thermal expansion.
The leaf spring (5) absorbs the forces ζ and 11 that cause the center position of the tube to move, and the heat transfer tube (1) and the fin/coat are
(4) Since the l'Hi ratio is maintained to keep the contact surface pressure constant, the support JA1 is stable even when operating conditions change!
,! Nichiryoku'-4 concubines. -i, it can be escaped by sliding the inner surface of the bush (4) to the length of the heat exchanger tube (1) in the axial direction. +-'-i side has ceraminokko-
Since the tee is rated 7, there are no problems such as stiff M.

As described in detail below, the present invention provides the following effects.

(a) The support contact area V between the heat transfer tube (1) and the bushing (4).
L is avoided.

(bl) Since the above-mentioned support contact portion always provides support without backlash regardless of the operating conditions, there will be no repeated bending (therefore, no cracks will occur in the ceramic coating portion).

(C1 Since the contact surface pressure of the above-mentioned support contact portion is uniform over the entire surface, serious accidents such as rupture of the heat exchanger tube +1 caused by cracks and their restraints) can be prevented.

(d) As a result of (a) or C) above, reliability as a high-temperature heat exchanger is improved and its life is extended.

tel Because it does not require a high level of silk sheathing or processing precision, it is possible to shorten the process and improve work efficiency.

It goes without saying that the present invention is not limited to the above-mentioned embodiment, but can be implemented with various modifications within the scope of the invention. For example, as shown in Fig. 6, several partial circular arc pads (7) may be used instead of the bushes (4) to form a discontinuous portion in the circumferential direction on the outer peripheral surface of the heat transfer tube (1). It may also be arranged in such a way that the Furthermore, this pad (7)
Needless to say, a ceramic coating is also applied to the inner surface of the (. Also, as shown in Figure 7, a partial arc);
When applying force, a corrugated leaf spring (5
) Instead, a leaf spring (8) with a cross section of Ω shape and having a Tl of 1 and L for each node (7) can be used.
stomach. Furthermore, as shown in Fig. 8, in place of the Ω-shaped leaf spring (8) in Fig. 7, a part of each 7% rad force 91 is replaced with a leaf spring (9) having a cross-sectional shape. (・You may also press it by pressing it.In addition, in FIG. 6(・・), in FIG. 8, td is the same as in FIG.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a support structure for heat transfer tubes in a conventional heat exchanger, and FIG. 2 is a high-l! FIG. 3 is a partially cutaway perspective view showing an embodiment of a support structure for heat transfer tubes in a 1"n heat exchanger; FIGS. The perspective view shown in n1 and Figures 6 to 8 are cross-sectional views showing other examples of the non-explosion January. +11... Heat exchanger tube, (3)... Support plate, (4) ...Futsuzoyu, (5)...Plate spring, (6)...Sleeve. 1st flash, 3rd figure, 5th flash procedural amendment (March 11, 1981, Commissioner of the Japan Patent Office, Kazuo Wakasugi, 1, fi1) Showing the patent application 1984 20104
No. 5, No. 2, Title of the invention High-temperature heat exchanger 3, Person making the amendment Relationship to the case Name of applicant
Mitsubishi Heavy Industries, Ltd. 4 Riyo Osamu 〒100 Ijrakucho, Chiyoda-ku, Tokyo] 'T 8-1-1
] Hiya-ichiri bilge/ri 5] 9'y (Tonta 2+3-06
86) (Tsukuda j) Ki Toshi Masami:'
, 1-5, Purpose of amendment order Showa year, month, day 6, 1tli positive object column of ``detailed explanation of the invention'' of the specification. 1) Drain/Page/3 Y-r [Reactor 1 is deleted. (2) On the third page, lines 4-7 "Skeme" total 1 steam" and 1τ11fE L, 1st portrait. [Takki]
1-taki'' and old market, 1g line 1-1Iiii:
qρl'4: Put J into Aj city as ``men/10) 11th grade''. (3) "Taki" the first picture of J'fr [Takki]
31 correct. (4) 61st 'kun/, 3-7'1 line 1-included' is [included 1 and N-cho IF and 7 dimensions. (5) G is the old 1st floor with 1-3 rows of 1-takki "Kin matataki".

Claims (1)

[Claims] Heat transfer t9ri2, unlucky U1 in the circumferential direction on the outer peripheral surface of this heat transfer tube
: A bushing provided so as to be in contact with each other, a cylindrical sleeve loosely inserted into the four sides of the bushing, and a heat-suppressing elastic part held between the sleeve and the bushing. A high-temperature heat exchanger characterized in that the heat exchanger tube is supported by fitting the sleeve to a support plate.