JPS5984080A - Helical coil type heat exchanger - Google Patents

Abstract

PURPOSE:To reduce thermal stress and improve the reliability thereof by a method wherein a high-temperature part helical coil heat transfer tube and low and middle-temperature part helical coil heat transfer tube are separated by an intermediate connection tube while the former is supported and suspended by a high- temperature part support beam and the latter is suspended and supported by the low and middle-temperature part support beam. CONSTITUTION:The helical coil heat transfer tube 8 is divided into the upper helical coil heat transfer tube 8a part and the lower helical coil heat transfer tube 8b part and both of them are connected by the intermediate connection tube 10 while the upper helical heat transfer tube 8a is suspended and supported by the upper support beam 15 and the lower helical coil heat transfer tube 8b is suspended and supported by the lower support beam 18. Accordingly, the thermal expansion of the upper helical heat transfer tube 8a is absorbed by the intermediate connection tube 10 so as not to affect to the lower helical coil heat transfer tube 8b or a lower connection tube 13 while the lower connection tube 13 is enough to absorb only the thermal expansion of the lower helical coil heat transfer tube 8b, therefore, the thermal stress may be reduced remarkably.

Description

[Detailed Description of the Invention] This invention relates to QJ, -\ Recalcoil type thermophilic exchange 2:9! li & L Commercial Temperature Department/Recalcoil Heat Transfer--and Low/Medium Temperature Suru 1 Hanchu Prefecture 4J Yorayo 6-E Mukaisei? -1
The field 1 helical coil heat transfer% is divided by the intermediate connecting pipe, and the temperature is 1'? (The helical coil heat transfer tube is connected to the high temperature section with a support beam, and the low and medium temperature section of the helical coil heat transfer chamber is connected to the low and medium temperature sections.
By configuring them to be suspended and supported by medium-temperature section support beams, mutual interference due to thermal expansion between the high-temperature section heat exchanger tubes and the low/medium-temperature section heat exchanger tubes can be avoided during the entire period of 11 hours, and the high-temperature section heat exchanger tubes can be suspended even after 3 hours of heat transfer. This invention relates to a helical coil heat exchanger that can significantly reduce the stress generated in heat exchanger tubes and improve the durability and reliability of heat exchanger tubes.

Recently, the heat generated in a nuclear reactor is extracted at high temperature using a primary heat medium such as helium gas, and this heat is exchanged with a primary heat medium such as helium gas at an intermediate heat source. So Shiroden's 11 is iron making and chemical reactions.

A multi-purpose high-temperature gas reactor is being researched and developed to be used for multiple purposes such as pond water desalination and district heating and cooling.

By the way, the heat exchanger "f11" in the above is about ] (100
Around C 1 (Since heated gas is frequently supplied and discharged, absorption of thermal expansion of heat exchanger tubes, etc. is an important issue in terms of 1+'1.1-14 more.

Next, a conventional heat exchanger of this type will be explained based on FIG.

In the figure, the secondary helical coil is shown as 1ALT helical coil heat transfer%, and the helical coil heat transfer tube a is installed by winding it in a spiral around the main pipe as a collecting pipe.
'+ has been added. Secondary helium &2 is introduced into the helical coil heat transfer tube a from the upper connecting pipe C and descends inside the helical coil heat transfer '^a, -force is about 95 () ~ 1 (100
The high-temperature primary helium of C is pulled from below in a main pipe in a container (not shown) of a heat exchanger, and is subjected to indirect heat shrinkage of primary helium and secondary helium.

The heated secondary helium is collected at the lower end of the main pipe through the lower connecting skin d connected to the helical coil heat exchanger tube aT, and then the main pipe is placed in the upper row and taken out of the outer vessel. 3. The helical coil heat exchanger tube a is supported by a perforated plate (or ladder) suspended from the double boat beam e extending from section 11b to the lower connecting tube C section. Since it is a suspension support method from one point on the Zapoto beam e, the difference in thermal expansion between the amount of thermal expansion of the beam and the amount of thermal expansion of the helical coil heat exchanger tube a and the perforated plate (approximately 7 m in length) is concentrated. This acts on the lower connecting pipe d.For this reason, a large stress is generated in the lower connecting pipe d, reducing the durability of the lower connecting pipe d, which is at the highest temperature and is under severe thermal conditions. (During rated operation) A heat insulating layer is applied to the inner circumferential surface of the main part, and its layer thickness is adjusted to balance the thermal expansion of the soil layer and the helical coil transmission. H9 old -1- is used so that the amount of thermal expansion of heat tube a is the same, but during thermal transients such as starting and stopping, the temperature change of the secondary helium and the main pipe... Reno norcoil heat exchanger tube a Fuj: Tonori 1〉It does not match the change in the thickness of the thigh, and the main thing is b and he'J Nofuru coil heat exchanger tube a
A difference in thermal expansion occurs between the two, and stress concentration in the lower part is unavoidable. VC1 Upper connecting tube C and helical coil heat transfer Wa upper low and medium range tube group section and helical coil heat transfer %Ii' a lower part and 0 and lower connecting tube d high temperature area (M!
jr part υ′ (, not due to the difference in thermal expansion in the vertical direction,
Thermal expansion in the coil radial direction of helical coil heat transfer tube a 7GE
There is a problem in that even if the two elements are different, they will interact with each other and generate stress.

The present invention has been devised to effectively solve the above-mentioned conventional problems, and the present invention has been devised to effectively solve the problems of the prior art. A helical coil type heat exchanger that can greatly reduce the stress that occurs during heat transfer in high-temperature parts during thermal transients, and improve the durability and reliability of heat transfer tubes. Our goal is to provide the following.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.In Figure 2, 2 is a cup-shaped container of the heat exchanger 1; In the part, a primary helium introduction D3 is formed to introduce a wide primary helium serving as a heating medium. ♀In the container 2, this − next heliuno introduction U, +
The primary Heliuno introduced from 3. Odo unit 21111
There are four internal ducts guiding the upper case in the direction Kifl. The internal duct 4 is provided with a joint shape of /1゛, Answer 2: Amount 2 is suitable for the inner wall, FL' PjlIIH, i'I-1, valley 2, iL, i-i,
-c has a double-pipe structure with an inner duct 4 and a container 2 as an outer pipe. A path 5 is formed in the internal duct 4 for the heating medium to rise at tLI, and the primary helium discharged from the upper end of the internal duct 4 after heat exchange is transferred to the primary helium at the lower end of the container 2. A cylindrical heating medium 41F 7 is provided in the ItJK formation between the container 2 and the duct 4 to be guided downward to the discharge port 6.

In addition, a helical coil heat transfer layer 8 for transferring secondary helium and a main pipe 9 for collecting and discharging secondary helium with a helium coil heat transfer rate of 1°8 are installed in the internal helium 4. has been done. The main pipe 9 is inserted into the center of the same group duct 4 by passing through the container 2, and the helical coil heat transfer 8 is wound spirally in multiple layers around the royal stomach 9. (see Figure 3), the helical coil heat exchanger tube 8 is heated with secondary helium (as a heating medium of low/medium rfrA which has become relatively low temperature), and is located at yXB above the path 5 area. Upper vertical coil heat transfer tube 8a as medium temperature helical coil heat transfer layer) 1: The helical coil heat transfer layer is formed separately from the helical coil heat transfer layer and the 8b section.Then, these curved intermediate portions are connected through the connecting pipe 1ov.In addition, secondary helium is added to the upper helical coil heat transfer layer 8a. In order to introduce
The upper connection is 512pcJ, and the nJ is connected during the riff. Further VC-1/base 11 Helical coil heat transfer%
The space 1c between the lower end of 813 and the lower end of main pipe 9 is the lower connecting layer.
13, the secondary helium that has reached the sieve temperature from the lower helical coil heat transfer theory 8b gathers at the lower end of the main pipe 9, and a part of the secondary helium 1 flows through the main pipe 9. The IIM is designed to come out of the container 2 from 14.

The main pipe 9 at the upper part of the internal duct 4 has one end welded to the main pipe 9 and a groove extending radially outward, as shown in enlarged view in FIGS. 3-4. An upper Leebor beam 15 with a retaining position is provided. -j2hB-li, I''-1
- The beam 15 suspends and supports the upper helical coil heat exchanger tube 8a.
They are provided radially from the main pipe 9 (eight pipes in the illustrated example), and the upper connecting pipe 12 is piped at the - side, avoiding the support beam 15. Each” Nito the, I?
As shown in FIG. Yes, perforated plate 17
A large number of insertion holes for inserting and supporting the helical coil heat exchanger tubes 8 are provided at predetermined intervals along the longitudinal direction in accordance with the pitch in the vertical direction of the layers of the helical coil heat exchanger tubes 8. Furthermore, the middle 1uJ part connecting tube 10 +? ISO
In order to suspend and support the lower helical coil heat exchanger tube 8b, the main pipe 9 is provided with a lower helical coil heat exchanger tube 8b cantilevered in a radial IJI shape like the upper Zaport beam 15. - A beam 18 is provided, and a perforated plate supporting the pipe 8b is suspended from the beam 18 of the bottom section through a hanging rod (not shown). A heat insulating layer 19 of an appropriate thickness is attached to the inner circumferential surface of the main pipe 9 to cover it.

Next, the operation of this embodiment will be described.

- The next helium is the primary helium introduction 113 at the bottom of the container 2.
The secondary helium is introduced into the internal tank 1-4 and rises through the medium flow 1-4, while the secondary helium is heated through the secondary helium introduction L111 in the upper part of the container 2 through the -1 partial communication pipe 12. 10. The upper part of the medium flow path 5) 916 is introduced into the calcoil heat transfer chamber 8a, flows down the pipe, and is connected to the middle part before contacting the middle part. Lower helical coil heat transfer ti8b r -F? τ1; Contact-1
3 and is collected in the main layer 9-F. During this time, there is no heat exchange between primary helium and secondary helium t+-,
The heated secondary helium reaches a high temperature in the main pipe 9 and is discharged from the secondary helium discharge section 14, and its thermal energy is used for power generation, steel manufacturing, etc. VC supply facilities 1. Ru. On the other hand, the primary helium that has heated up the secondary helium and has warmed down descends through the heating medium discharge passage 7, is used from the primary helium \lium '4 1 inner port 6, and is returned to the reactor as core material. . -Next helium Q"1, -Next helium introduction 1"3 about 1.00
IL1 introduced at 0C is about 4 (at 10C - 4171 from the next Heliud publication D6). Also, the secondary helium is introduced at about 3'50C from the secondary helium introduction [2111, Discharge II 14 at approximately 950C.

In this way, very high temperature helium is being supplied and discharged in the container 2, so the thermal expansion of the main pipe 9 and the thermal expansion of the recal coil heat transfer tube 8, etc. (a difference occurs, and the helical Stress is likely to be generated in the coiled heat exchanger tube 8, etc. Therefore, conventionally, a VC insulation ring 19 is provided inside the main tube 9 to prevent thermal expansion between the main tube 9 and the helical coil heat exchanger tube 8, etc. However, this difference in thermal expansion occurs not only during thermal transients such as starting and stopping, but also during normal operation due to the temperature difference between the upper and lower parts. The helical coil heat exchanger tube 8, etc. 1c in the l-crystalline region is subject to high stress, which inevitably shortens its lifespan.

However, in this embodiment, the IJ nonorcoil heat transfer type 8 is divided into the upper helical coil heat transfer type 8a part, the -F part, and the recal coil heat transfer tube 8b part, and the middle part is connected between them. At the same time, the upper helical coil heat exchanger tube 8a is suspended by the lower support beam 15, and the lower helical coil heat transfer tube 8b is supported by the lower support beam 18. There is.

Therefore, upper helical coil heat transfer? The thermal expansion phase of J 8a is absorbed by the intermediate connection W10, and the lower helical coil heat transfer tube 8b and lower communication tube 13 are absorbed by the lower helical coil heat transfer tube 8b and the lower communication tube 13. It is good to absorb only the thermal expansion of b. This/, :me, like the previous V-ko,
It is unlikely that the total thermal expansion difference between the main pipe 9 and the helical coil heat transfer pipe 8 will be concentrated in the lower connecting pipe 13, and only the thermal expansion of the lower helical coil heat transfer pipe 8b needs to be absorbed. The stress generated in the lower connecting pipe 13 due to the difference can be significantly reduced, and the life of the lower connecting pipe 13 under high temperature can be significantly shortened.

The vertical direction of the lower helical coil heat exchanger tube 8b section is = J law phantom 1. In order to keep the stress of the tube body in the vortex section low, it is desirable to select a small size, and -1 part of the helical coil heat exchanger tube The dimensions of section 8a are thicker, and the middle connecting pipe 1
However, since the intermediate connecting pipe 10 is in the middle temperature range of the heating medium flow path 5, the metal of the '11n4J connecting pipe 10 has sufficient stress tolerance compared to the high temperature connecting pipe. It has enough capacity so it won't be a problem.

In addition, since the phase η effect due to thermal expansion between the upper helical coil heat exchanger tube 8a and the lower helical coil heat exchanger tube 8b is divided into two, there is no difference in thermal expansion in the downward direction as described above. Interaction due to the difference in thermal expansion in the coil radial direction of the helical coil heat exchanger tube 8 is also prevented.L1 This makes it possible to reduce the stress generated in the lower helical coil heat exchanger tube 8b + the lower connecting tube 13 or the upper helical coil heat exchanger tube 8a.

In addition, although the above embodiment shows an example in which the present invention is applied to an intermediate heat exchanger of a multipurpose high-temperature gas furnace, the present invention is not limited to this, and is applicable to particularly high-temperature (and low-temperature) heat exchangers. This is effective for large helical coil type 9 converters. In addition, in the above embodiment, when the heating medium is lowered, the heating medium is
A similar effect can be obtained in a heat exchanger whose construction has been changed so that the sister bodies are stopped and the flow flows counter to each other. .

In summary, the present invention provides the following excellent effects.

(1) High temperature section Helical coil heat exchanger tube
The helical coil heat transfer tubes in the low and medium temperature sections are suspended and supported by the support beams in the low and medium temperature sections, and the h of these heat transfer tubes is set to the medium f1. Since the iJ section is connected to the connecting pipe to absorb thermal expansion separately, thermal expansion can be absorbed both during thermal transients and during normal operation (when an unexpected difference in thermal expansion occurs according to Proposition 1). It can be absorbed easily and safely, greatly reducing the stress on the heat medium transfer rate of helical coil heat transfer tubes, etc., and improving its reliability.

(2) Therefore, it is possible to maintain the durability of the helical coil heat exchanger tube and various liaisons and extend their lifespan.

Therefore, although the structure is more complicated than before, it is economical in the long run because it can extend the replacement interval of heat exchangers or the repair interval of helical coil heat exchanger tubes, improve the operating rate, and so on.

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional view of a conventional heat exchanger, and Fig. 2 shows an embodiment of the heat exchanger according to the present invention.
The top view, Figure 3 is a partially enlarged 110 side view of the heat exchanger, Figure 1
FIG. 1 is a plan sectional view of FIG. 3. 1 Oka, 1 is a heat exchanger, 2 is a container, 5 is a heating medium flow path,
8 (c), - Recal coil heat exchanger tube, 8a Part helical coil heat exchanger tube (low/medium temperature part helical coil heat exchanger tube), 8
bli lower helical coil heat transfer tube (high temperature part helical coil heat transfer tube), 9 is the main pipe, 10 is the middle part connecting pipe, 15 is the upper support beam (low/medium temperature part support beam), 18 is the lower support beam (high temperature part support beam) ). Special W "Applicant: Ishikawajima Harima Heavy Industries Co., Ltd. Representative Patent Attorney Nobui Kinutani 1χ2 Figure 1 Figure 71" Figure 73

Claims (1)

[Claims] High-temperature part of the heating medium flow path area with cylinder temperature supplied to the heat exchanger - \Low/medium-temperature heating medium flow path area where the recal coil heat transfer tube and the heated medium are heated to a relatively low temperature 1141 with the intermediate temperature helical coil lying heating layer is connected by an intermediate communication pipe, and is extended from the main pipe to suspend and support the high temperature helical coil heat transfer 'tW and the low/medium temperature helical coil heat transfer tubes, respectively. High temperature part: +r゛-+・Beam and a(
・Medium temperature part'v71? - Features: 1.
-Helical coil heat exchanger.