JPH0518634Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention <Industrial application field> This invention is aimed at reducing the amount of solid matter such as dust or scale contained in the fluid flowing through the small-diameter tube side of a multi-tubular heat exchanger. A scale trap (SCALE) captures and crushes the
Regarding CATCHER).

<Conventional technology> Conventionally, a heat exchanger has not been equipped with a filter, so solid matter such as dirt and scale contained in the fluid on the tube side can clog the tube opening on the fixed tube plate surface or the inner wall of the tube, preventing heat exchange. This caused an increase in pressure in the equipment and a decrease in efficiency, which in turn caused energy loss in pumps and other equipment. To remove those solids, chemical cleaning is applied to the heat exchanger,
Not only is maintenance and management costly, such as mechanical cleaning of the inner surface of the tube or cleaning with high-pressure water jets, but the entire fluid treatment process, including the heat exchanger, must be stopped during cleaning operations. Therefore, there is an inconvenience that it may affect the production plan.

<Problems to be solved by the invention> In view of the problems inherent in the conventional type of heat exchanger as described above, the present invention installs an overheater in the partition chamber on the fluid inflow side of the heat exchanger. By cutting out a part of the upper surface of the heat exchanger and forming a bypass flow path, it is possible to prevent and suppress blockage of the fixed tube plate surface and tubes of the heat exchanger or increase in flow resistance.
The purpose of this is to extend the period of non-release operation of the heat exchanger.

B. Structure of the invention <Means for solving the problems> In order to achieve the above-mentioned object, the present invention comprises the constituent elements as described below.

(1) A filter made of a filter material capable of capturing solid matter mixed in the fluid is installed in the fluid inflow side partition of the multi-tube heat exchanger, and a fluid guide is provided to guide the fluid into the filter. At the same time, a part of the overfill material is cut out to open a bypass flow path,
A heat exchanger characterized in that when the upper surface is blocked, the inflowing fluid is bypassed through the opening.

(2) The heat exchanger according to item (1) above, wherein a solid backflow prevention weir is formed above the fluid guide.

<Operation> A shell-and-tube heat exchanger houses a tube bundle made up of many tubes in an outer cylinder called a shell, and between the fluid flowing inside the outer cylinder and the fluid flowing inside the tubes,
Heat exchange is performed through the tube wall. Functionally, the tube is classified into heaters, coolers, condensers, evaporators, reboilers, etc. In any case, the fluid flowing inside the tube first flows into the inlet compartment of the heat exchanger through the inlet. After that, it flows into the tube, then enters the outlet side partition, and is discharged from the outlet to the outside of the heat exchanger. In the heat exchanger of the present invention, a squirrel cage equipped with a bypass flow path is installed in the above-mentioned partition chamber in the heat exchanger, and the fluid flowing into the heat exchanger is first guided into the squirrel cage, The same material captures solid matter such as scale and dirt mixed in the fluid entering the heat exchanger, and prevents solid matter such as scale from adhering to the fixed tube sheets and tubes inside the heat exchanger. It also slows down the adhesion rate and extends the period of continuous operation of the heat exchanger without opening.

<Example> Hereinafter, specific examples of the present invention will be explained with reference to drawings, but the present invention is not limited to the illustrated type, and can be applied to a shell-and-tube heat exchanger to achieve the above purpose. It should be understood that all devices that meet the constituent requirements fall within the technical scope of the present invention, even if there are slight differences in specific structure.

(Part 1) Figs. 1 to 4 show an embodiment in which a cage-shaped filter is applied to a U-tube type multi-tube heat exchanger. In FIG. 1, 1 is an outer cylinder, 2 is a large number of U-shaped tubes attached to a fixed tube plate 3, and a partition chamber 4 is divided into an upper partition chamber 6 and a lower partition chamber 7 by a partition plate 5. 8
and 9 are an inlet and an outlet for the fluid flowing inside the U-shaped tube 2, respectively, which communicate with the upper partition chamber 6 and the lower partition chamber 7, and 10 and 11 are inlets for the fluid flowing inside the outer cylinder 1, respectively. and the outlet.
The squirrel cage 12 according to the present invention is installed in the partition chamber 6 on the inlet side of the fluid flowing in the U-shaped pipe 2,
As shown in FIGS. 2 to 4, the passer is assembled by covering a frame 13 made of, for example, angle material with a wire mesh or punched metal mesh 14, and a fluid inlet of the heat exchanger. A part or entire surface of the side far from the fixed tube plate 3 (see Figures 1 and 2) is provided with a fluid guide 15 that guides fluid into the filter vessel 12 from the side 8.
4 is removed and this part is used as a fluid bypass flow path 16.
It consists of the following structure. The entire filter unit 12 is constructed by connecting the lug plate 17 to the partition plate 5 with bolts and nuts 18.
The partition plate is screwed onto the partition plate and is detachably attached to the partition plate. The mesh size of the mesh 14 is changed depending on the size of the solids mixed in the fluid, and for example, one with a mesh opening of about 2 to 10 mm is appropriately selected and used.

In the case of this embodiment, a type in which the fluid flows into the heat exchanger partition from the upper side as shown by the arrow in the figure is explained.

(Part 2) Figures 5 to 8 show other embodiments in which a squirrel cage is installed in a floating head multi-tube heat exchanger, in which fluid flows in from the lower side of the heat exchanger partition 4. Indicates the type. In FIG. 5, 1 is an outer cylinder, 20 is a multi-tube, 3 is a fixed tube plate, 21 is a floating tube plate, 22 is a floating head lid, 4 is a partition chamber, 5 is a partition plate, 6 is an upper partition chamber, 7 23 and 24 are an inlet and an outlet for the fluid flowing in the pipe, respectively, and communicate with the lower partition 7 and the upper partition 6, respectively. 25 and 26 are an inlet and an outlet, respectively, for the fluid flowing inside the outer cylinder 1. 12 is a cage-shaped filter. The cage-shaped filter 12 is the sixth and seventh
As shown in the figure, a fluid guide 15 is provided at a position corresponding to the fluid inlet 23 to guide the fluid from the inlet 23 into the filter vessel 12 , and the upper end of the fluid guide 15 is located inside the filter vessel when the fluid flow stops. A dam or weir 27 is formed to prevent solid matter from falling into the inlet 23, such as scale, which has accumulated therein.
The squirrel cage 12 also lacks the mesh on the side opposite to the fixed tube sheet 3 (see Figures 5 and 6), and uses the same opening as the bypass passage 16, but the other side are all covered with a mesh 14.

The filter 12 is fixed by removably screwing the lug plate 17 onto the partition plate 5 with bolts and nuts 18.

Fluid and filter 12 in these embodiments
For an explanation of the operation, please refer to the previous <Operation> section. Then, using the heat exchanger of the above embodiment,
For example, by cooling the petroleum fraction by flowing high-temperature light petroleum fraction into the outer cylinder side and flowing seawater or industrial water into the multi-tube side, the continuous use period of this heat exchanger is shorter than that of conventional equipment. We were able to demonstrate that it is possible to extend the period by approximately 1.5 to 2.0 times.

C. Effect of the invention The heat exchanger according to the invention removes most of the solids such as scale mixed into the inflowing fluid by providing a squirrel cage in the inflow side partition of the fluid flowing on the tube side. It can be captured by its overwood. In addition, since the fluid is introduced into the squirrel cage through the fluid guide, solid matter such as scale in the fluid collides with the partition plate or the mesh and is pulverized into small particles. Even if it passes through the tube, it will not block the tube when flowing inside the tube.

In this way, according to the present invention, the substantial amount of solid matter such as scale adhering to the fixed tube sheets, floating tube sheets, and multi-tubes in the heat exchanger is greatly reduced, and the continuous use of the heat exchanger is The period can be dramatically extended, and the frequency of cleaning can be reduced.

Furthermore, since the squirrel cage sieve according to the present invention has a bypass flow path, even if the sieve material is completely clogged, the fluid will flow through the bypass flow path, and the pressure inside the heat exchanger will not increase. It is possible to prevent inconveniences such as applying a high load to the fluid pump.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the heat exchanger of the present invention. Figure 1 is a front longitudinal sectional view, and Figures 2 to 4 are cage-shaped cross-sectional views in Figure 1. They are an enlarged front longitudinal cross-sectional view, a side cross-sectional view, and a perspective view of the vessel portion. 5 to 8 show another embodiment, FIG. 5 is a front longitudinal sectional view thereof, and FIGS. 6 to 8 are enlarged front views of the squirrel cage portion in FIG. 5, respectively. They are a longitudinal cross-sectional view, a side cross-sectional view, and a perspective view. 1...Outer cylinder, 2...Multi-tube (tube), 4...
Partition, 5... Partition plate, 6... Upper partition, 7...
...Lower partition, 12 ...Cage type filter, 14...
15...Fluid guide, 16...Bypass channel.

Claims (1)

[Claims for Utility Model Registration] (1) Provided with a filter capable of capturing solid matter mixed into the fluid inflow side partition of a shell-and-tube heat exchanger, and equipped with a fluid guide for guiding fluid into the filter. In addition, a heat exchanger characterized in that a bypass passage is opened by cutting out a part of the overfill material, and when the overfill surface is blocked, the fluid is bypassed through the opening. (2) The heat exchanger according to claim (1) of the utility model registration, wherein a solid backflow prevention weir is formed on the upper part of the fluid guide.