JPS636393A - Shell and tube type heat exchanger - Google Patents

Abstract

PURPOSE:To be able to cope with the change in load easily and safely by varying the flow passage of heating fluid by adjusting the location of a buffle plate in a barrel axis direction from the outside of the barrel. CONSTITUTION:The rotation of a threaded rod 19 with an operating handle 20 allows a movable buffle 25 to rise up. As a movable buffle 24 is connected to the buffle 25 with chains 26, the buffle 24 flows to rise up. In the condition that the buffles 24, 25 are kept pulled up heating fluid flowing in to an upper barrel 8 from an inlet 9 for the heating fluid flows through fixed buffles 21, 22, in a zig-zag way and then flows outside directly from an outlet 10 for the heating fluid. Therefore, as the speed of the heating fluid is reduced and contacting opportunity between the heating fluid and heat transfer tubes 7 where heated fluid flows is reduced by the change in contacting direction from crossing flow to parallel flow, etc. transmittance of heat transferred to the heated fluid is reduced and an exchanged heat amount is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shell-and-tube heat exchanger in which the amount of heat exchanged is variable.

[Conventional technology]

For example, in a high-temperature gas reactor, the temperature from the reactor to about 850°C is
Primary helium is flowed out, the thermal energy of the high-temperature secondary helium is recovered by a pressurized water cooler, and the helium at approximately 400°C is returned to the reactor for operation.

As shown in Fig. 3, a conventionally used pressurized water cooler has pressurized water heat transfer tubes housed in a closed shell a, and both ends of the pressurized water heat transfer tubes are connected to a pressurized water inlet C and a pressurized water outlet G provided at the bottom. and the primary helium flowing from the negative helium population d into the sealed same a. In the figure, f indicates the primary helium outlet, and Q indicates the pressurized water outlet.

[Problem that the invention seeks to solve]

However, the above-mentioned pressurized water cooler may be operated at a different load, for example at 50% load. In this case, it is necessary to keep the temperature at the entrance and exit of the high-temperature gas furnace the same at maximum load and at 50% load, but even if the flow rate of the heating fluid such as helium gas is set to 50%, the amount of heat transferred will not be 50%. If the flow rate of water is reduced to reduce the heat transfer amount to 50%, problems such as boiling of the pressurized water will occur.

In order to solve this problem, for example, a method of partially bypassing the heated fluid outside the sealed shell a can be considered, but in this case, the heated fluid with a lower temperature flowing out from the sealed shell a and the bypassed high temperature fluid This is not preferable because the temperature difference between the heating fluid and the mixing portion becomes large and thermal stress occurs.

It is also possible to install two pressurized water type coolers e in series or in parallel to bypass helium during low load, but in either case, the number of pressurized water type coolers e increases, resulting in high equipment costs.

[Purpose of the invention]

The present invention was devised in view of the problems associated with the conventional technology, and is a heated water type cooler that changes the flow path of the heated fluid to vary the heat transfer coefficient outside the tube of the heat exchanger. The purpose of the present invention is to provide a shell-and-tube heat exchanger that can be operated at low loads.

[Means for solving problems]

In order to achieve the above object, the shell-and-tube heat exchanger of the present invention accommodates a large number of heat transfer tubes in the body in the same direction as the body, so that the heated fluid flowing outside the tubes zigzags from the inlet side to the outlet side. In a shell-and-tube heat exchanger that is equipped with a plurality of baffle plates so that the fluid flows in a straight line, the flow path of the heated fluid can be varied by adjusting the position of one or more baffle plates from the outside of the body in the axial direction of the body. It is characterized by being

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

Fig. 1 shows an embodiment of the present invention, in which a pressurized water inlet 3 and a pressurized water outlet 4 are provided in the lower part of the body 2 of the body 1 which is divided into upper and lower halves, and a partition plate 5 is provided inside the lower part 2 to provide a pressurized water inlet and an outlet on the same side. A pressurized water heat transfer tube 7 arranged in a tube plate 6 and isolated from the side.
This allows communication between the pressurized water inlet side and the pressurized water outlet side.

A heated fluid inlet 9 is provided at the lower part of the upper body 8 that accommodates the pressurized water heat transfer tube 7, and a heated fluid outlet 10 is provided at the upper part,
Furthermore, within the upper body 8 are fixed baffle plates 21, 22. and movable baffle plates 24, 25 (two movable baffle plates in this embodiment) are respectively disposed so that the heated fluid flows in a zigzag pattern.

The movable baffle plates 24 and 25 are connected to each other by a chain 26, and a screw hole is provided in the center to be screwed into a threaded rod 19, which will be described later. The movable baffle 25 is a stopper 27
The lowest point is positioned by the movable baffle 24.
is supported by a baffle stopper 28 provided at the tip of the threaded rod 19, and a movable baffle 24.25
The spacing between is maintained.

The threaded rod 19 has a central portion 19a that is enlarged in diameter and has a male thread cut therein.

Both ends are threadless rods, the lower end has a stopper 28 for supporting the baffle plate, and the upper end has an operating handle 20.

A threaded rod 19 passes through the top of the upper body 8 and projects into the body.

Next, the effect will be explained. When the threaded rod 19 is rotated by the operating handle 20, the movable baffle 25 is raised.

The movable baffle 24 is connected to the movable baffle 25 by a chain 26, so that it is suspended and raised. It is preferable that there be at least three chains 26. When the movable baffle 25 rises roughly, the movable baffle 24 also screws into the threaded portion 19a of the threaded rod 19. Then, as shown in FIG. 2, when the movable baffle 25 rises and comes off the threaded portion of the rod 19, it stops there. The following movable baffle 24 rises and stops when it hits the stopper 28.

With the movable baffles 24.25 being pulled upward as described above, the high temperature heating fluid flowing into the upper shell 8 from the heating fluid port 9 flows through the fixed baffles 21.22 in a zigzag pattern, and then directly passes through the heating fluid outlet. Since it flows out from 10,
As the speed of the heating fluid decreases or the direction of contact with the heat exchanger tubes 7 changes from perpendicular to parallel, the chances of contact between the heating fluid and the heat exchanger tubes 7 in which the heated fluid flows decreases, causing the heated fluid to The heat transfer rate decreases, and the amount of heat exchanged decreases.

Note that the shell-and-tube heat exchanger of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes may be made without departing from the gist of the present invention.

〔Effect of the invention〕

As explained above, in the shell-and-tube heat exchanger of the present invention, the baffle plate housed in the body can be moved to change the flow path of the heating fluid, so it is easy and safe to respond to load fluctuations. Can correspond to

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the heat exchanger of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is an explanatory diagram showing an example of a conventional heat exchanger. 1...Body 2...Lower shell 6...Pipe Plate 7...Pressurized water heat transfer tube 8...Upper shell 9... ... Heating fluid inlet 10 ... Heating fluid outlet 19 ... Threaded iron 21.22 ... Fixed baffle plate 24.25 ...
...Movable baffle plate patent registration applicant Ishikawajima Harima Heavy Industries Co., Ltd. Representative Patent attorney Yoshiaki Shimamura Figure 1 Figure 2

Claims (1)

[Claims] A shell-and-tube heat exchanger in which a large number of heat transfer tubes are housed in the shell coaxially with the shell, and multiple baffle plates are provided so that the heated fluid flowing outside the tubes flows in a zigzag pattern from the inlet side to the outlet side. 1. A shell-and-tube heat exchanger, characterized in that the flow path of a heating fluid is made variable by adjusting the position of one or more baffle plates from the outside of the shell in the axial direction of the shell.