JPS6034383A - Container support structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a container containing a high-temperature fluid and a support structure for equipment, and the target containers and equipment include heat exchangers, tanks, and piping support structures. etc.

[Background of the invention]

As an example of a conventional container support structure, a heat exchanger having a flange type support structure is shown in FIG.

The outer shell 1 has a primary type nozzle 2 and a primary outlet nozzle 6.

The secondary upper mirror plate 3 is connected to the outer shell l, and forms a secondary upper plenum 5 therein. Secondary side upper mirror plate 3
It has a secondary outlet nozzle 7 above it.

The heat transfer 'U' bundle 9 is connected at the upper end to the upper tube plate 4 and the lower end to the lower metal plate 8, and includes a heat shielding plate 11f near each 'U plate. is formed. Also, heat transfer official 9
There is an entrance window 12 at the upper part surrounding the window, and an exit window la at the lower part.
An external shroud 10 having two outer shrouds is installed.

Note that a bypass seal 16 is installed between the outer shell 1 and the outer shroud IO.

The secondary fire inlet pipe 15 passes through the secondary side upper end plate 3, the upper tube plate 4, and the subordinate plate 8, and has a lower end opening in the secondary side lower plenum 14.

The primary side high temperature fluid is introduced into the outer shell l through the primary nozzle 2, and is introduced into the outer shell l through the inlet window 1 provided in the outer shroud lO.
2, flows into the outer shroud lO, descends while exchanging heat with the secondary fluid rising in the heat transfer tube bundle 9, passes through the outlet window 13 provided at the lower part of the outer shroud lO, It flows out of the device from the next outlet nozzle 6.

On the other hand, the secondary side low temperature fluid flows into the equipment from the secondary fire inlet pipe 15, is reversed at the secondary side lower plenum 14, and is transferred to the lower tube plate 8.
It flows into the heat transfer bone connected to the primary side high temperature fluid, rises while exchanging heat with the primary side high temperature fluid, and is generated in the secondary side upper plenum 5.
It flows out of the equipment through the secondary outlet nozzle 7.

Such a heat exchanger is supported by a flange type support structure.

Figure 2 shows details of the flange part. In the flange support portion, an outer shell flange 17 connected to the outer shell 1 is fixed to a support flange 18 with bolts. This support flange 18 is connected to a support shell 19, and the entire heat exchanger is supported by a mounting flange 20. In such a heat exchanger, when starting or stopping the equipment, the outer shell
When the temperature of the primary fluid flowing inside the flange 17 changes, since the outer shell 1 is thin, it has a good ability to follow the temperature of the primary fluid, whereas the flange 17 has a large heat capacity. , temperature tracking for the primary fluid is delayed.

Figure 3 shows a temperature change diagram when the temperature of the primary fluid changes at startup and stop. There is a large temperature difference between the outer shell l and the outer shell flange 17, and the outer shell l and the outer shell flange 17
Large thermal stress occurs at the cutting area.

On the inward side of the joint between the outer shell l and the outer shell flange 17 where high stress occurs, the outer shell l
is still at a low temperature, while the outer shell flange 17 is left at a low temperature, resulting in compressive stress, and when the temperature of the primary fluid drops (when stopped), on the contrary, tensile stress occurs.

Therefore, the range of variation in the generated stress increases as a whole.

Although the flange type support structure has the advantage of having a relatively simple structure and being easy to assemble, the outer body flange 17 has poor temperature followability and generates large stress, so it is susceptible to temperature changes in the internal fluid. It can be considered to be applied to very slow moving devices or small devices, and it is difficult to apply it to large devices.

In order to improve the temperature followability of the outer shell flange 17, it is possible to reduce the heat capacity by thinning the plate thickness of the outer shell flange 17, but due to strength reasons, there is a limit to the thickness of the plate. Rather, the temperature change is due to a temperature delay in the radial direction, and it is necessary to shorten the distance in the radial direction, so it is unrelated to the thickness of the outer shell flange.

[Purpose of the invention]

An object of the present invention is to reduce the occurrence of thermal stress by improving the ability of the support structure to follow changes in the temperature of the fluid flowing inside the container in a cylinder heating container support structure. It is in.

[Summary of the invention]

The present invention provides a high-temperature container support structure in which the plate thickness from the outer surface of the protrusion for supporting the container to the fluid flowing inside the container is made almost uniform, and the temperature of the support structure in response to temperature changes of the fluid is improved. This improves followability. This makes it possible to reduce the occurrence of thermal stress.

[Embodiments of the invention]

An entire embodiment of the invention is shown in FIG.

The outer shell 1 is provided with an outer shell support part 22 made of approximately the same plate thickness as the outer shell l. The outer shell support portion 222 is in contact with the upper surface of the support flange 18 and is fixed by a presser fitting 23. Further, a key structure 24 is provided between the outer shell support part 22 and the support flange 18 to prevent rotational deformation between the outer shell support part 22 and the support flange 18. This support flange 18 is connected to the support cylinder 2.
The structure in which the entire AT device is supported by the installation 7/gear 21 is the same as that of the conventional example.

In the structure shown in Figure 4, the temperature change of the structure due to the temperature change of the internal fluid during normal startup and shutdown is shown below.
This is Figure 5.

As the temperature of the internal fluid increases, the temperature of the outer shell 1 almost follows, and the temperature of the outer shell supporting portion 22 also increases almost without delay. As a result, the temperature difference between the outer shell l and the outer shell support part 22 is greatly reduced compared to the case of the flange structure, and the connection between the outer shell l and the outer shell support part 22 is inward when the temperature rises. The generated tensile stress becomes very small.

Even when the temperature drops by 2, it follows the temperature drop of the outer shell 1 or the internal liquid by 11. On the other hand, the outer shell support portion 22 also follows the temperature with almost no delay.

As a result, the temperature difference between the outer shell 1 and the outer shell support portion 22 is greatly reduced. Therefore, the compressive thermal stress generated on the inner surface of the joint between the outer shell 1 and the outer shell support portion 22 is also greatly reduced.

The function required of this support structure is to hold the weight of the device itself. Furthermore, when an external force is applied to the equipment during an earthquake, etc., it is necessary to prevent the equipment from falling over. In this case, the support structure includes an outer shell support portion 2 in one direction of the circumference.
A gap is created between 2 and the support flange 18, and the outer shell support structure is lifted up. shows. The holding metal fitting 23 prevents this. The presser fittings 23 do not need to be continuous in the circumferential direction, and may be provided at several locations in the circumferential direction. Therefore, even if a temperature difference occurs between the outer shell support part 22 and the holding fitting 23, the difference in thermal expansion can be absorbed by the hole provided in the holding fitting 23 for the bolt 19. No circumferential stress is generated in the presser fitting 23. The purpose of the key structure 24 is to prevent the position of piping, etc. connected to the device from shifting due to rotation of the device body.

Is the target of the present invention not a heat exchanger but a similar support structure? Applicable to high temperature containers with

A modified version of the invention is shown in FIG. In FIG. 6, the outer shell l is provided with an outer shell support structure 22, which is installed on the upper surface of the support flange 18. The outer body support structure 22 is fixed using a holding fitting 23 to prevent the equipment from falling over.

This structure is similar to the conventional flange type structure. The basic difference consists in that the shell support structure 22 does not need to be provided with holes for bolts. It is possible to reduce the plate thickness in the radial direction of the tab and the protrusion from the outer shell, and the difference in plate thickness with the outer shell 1 can be reduced. Therefore, the fourth
Although the structure shown in the figure is basically the same, the temperature changes as shown in FIG. 5. Although the generated temperature difference is somewhat increased compared to the structure shown in FIG. 4, the effect is the same.

Moreover, since the structure is simpler than that shown in Figure 4, the number of processing steps t1 during production can be reduced.

The target device in this structure is not limited to heat exchangers, but can be used for high-temperature containers in general. Especially FBR
The effect is great because the equipment remains warm, and this structure can also be used for tanks, etc.

〔Effect of the invention〕

According to the present invention, effects below p can be obtained.

l) Significantly reduces the temperature difference between the outer shell and the supporting structure, which occurs even during temperature changes of 9% during normal startup and shutdown.

2) L) greatly reduces the thermal stress generated at the connection between the outer shell and the support structure, improving structural integrity.

3) The effects of l) and 2) are significant when the internal fluid is a fluid with a low heat transfer coefficient, such as liquid metal.

(9)

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional heat exchanger, Fig. 2 is a detailed view of a conventional support structure, Fig. 3 is an explanatory diagram of temperature changes in a conventional support structure, and Fig. 4 is a diagram of an uninvented embodiment. FIG. 5 is a detailed view of the support structure. FIG. 5 is also an explanatory view of temperature changes in the support structure. FIG. 6 is a detailed view of the support structure according to a modification of the present invention. l...outer shell, 2...1 firing nozzle, 3...secondary upper head plate, 4...upper tube plate, 5...secondary side upper plenum, 6...primary output Eye nozzle, 7...Secondary eye nozzle, 8...Bottom plate, 9...Heat transfer tube bundle, 2o...Support shell, 21...Installation flange, 22...Outer shell support Part, 23... Presser metal (10) Ho 1 Concave 15 Kaya 2 Figure 3 Eyes (b) Ha 0 Figure S (α) (b) 6th m 0 3 /9 -45120-

Claims (1)

[Claims] 1. In support structures for containers used at high temperatures, thin-walled structures that follow changes in the temperature of the fluid inside the container t%
Support structure of the container.