JPS5951378B2 - Bundle insertion method in heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inserting a tube bundle into a shell of a heat exchanger.

Conventional - The general method for inserting tube bundles into heat exchangers is to attach a tube plate to one end, keep the other end open and fix the tube bundle horizontally on the floor, and insert the tube bundle using a crane or a chain block. A horizontal insertion method was used for the retraction work.

However, this method is not only complicated and time consuming, but also has the problems that the inner surface of the body plate and the baffle plate are damaged, and that the tubes cannot be inserted into the tube plate at the same time. This is because the body plate and the tube bundle are in an insertion relationship, so they cannot be made to have the same size; the inner diameter of the body plate is greater than the outer diameter of the tube bundle, and the difference is several mm in the case of large ones. For this reason, a tube bundle inserted in a horizontal position contacts the bottom surface within the body plate, but leaves a gap on the top surface. Therefore, the cores of the tube holes for inserting the tube plate on the body plate side and the tubes of the tube bundle do not match, and it is impossible to insert the tubes simultaneously and integrally. The present invention uses an L-shaped undulating table that can be raised and lowered freely, so that a tube bundle that has been assembled in a horizontal position elsewhere is raised to the mold surface on this undulating table, and the tube bundle in the mold surface position is placed in the trunk from above. In addition to mounting the plate on top, the tubes are simultaneously inserted into the tube plate using long and short tube guides, which solves all the problems of the conventional method and makes it easier to assemble large heat exchangers. An extremely effective tube bundle insertion method was obtained. Examples of the present invention will be described below.

1-2 illustrate apparatus for carrying out the invention.

That is, 1 is a station for standing the tube bundle B upright, 2 is an L-shaped undulating table, and the L-shaped corner is rotatably supported 5 on the base of station 1. 3 is a tube holder. , prevents the tube from coming off.

Reference numeral 4 denotes a tube bundle receiving jig, which is fixed to the undulating table 2 with bolts 6 as shown in FIG. 2, and its position can be adjusted through elongated holes 4a.

Reference numeral 7 denotes a main winding rope hooking section 8, which is an auxiliary winding rope hooking section and is used when raising the tube bundle B.

Note that 13 is a full blade. Now, Figure 3 a-e
The method of inserting tube bundle B will be explained with reference to .

i) Setting the jig (Fig. 3a) The receiving jig and the tube holding plate 3 are set on the undulating table 2 of the station 1 shown in Fig. 1.

Ii) Lifting and setting of tube bundle (3rd
Figure b) The tube bundle B is suspended by a crane and placed on the bundle holder 4.

At this time, the bundle B being lifted is placed on the tube plate receiving ring 9.
(Fig. 4) and lower it onto the receiving jig 4. Next, remove the hanging tool of the tube bundle B and fix it at the position of the receiving jig 4. At this time, a tube guide 12 as shown in FIG. 5 is attached to the tip of the tube at the other end of the bundle. In this case, in order to ensure alignment with the hole in the tube sheet, a long tube guide 12' is attached at a predetermined location about 4 to 8 along the outermost circumference. Iiii) Raising the tube bundle (Fig. 3c) Raise the hoisting table 2 while balancing the main winding rope 7a and the auxiliary winding rope 8a.

Once it is vertical, make sure that it is in close contact with the base of station 1, and use station 1 to tighten and fix the bundle side base. Iv) On the other hand, the tube sheet 10 at one end
The body plate 11 with the parts ' fixed thereon is brought onto the upright tube bundle B, and while the verticality of the body plate 11 is adjusted, the body plate 11 is inserted from the top of the tube bundle B.

v) Loosen the bolts 6 of the tube bundle insertion bundle cradle 4 to widen the gap between the pedestals 4 (Fig. 6), shift and fix it until the body plate 11 is inserted, and then lower the body plate 11.

Next, the bundle holder 4 is shifted and fixed, and the body plate 11 is lowered to the bottom in the same order. Vi) Inserting the tube into the tube plate on the shell side When the tip of the tube bundle B comes just in front of the tube plate on the shell side tube plate 10', the lowering of the shell plate is temporarily stopped.

When viewed from the outside of the tube plate on the body plate side, as shown in FIG. 7, among the tube guides 12 attached to the tubes described above, long tube guides 12' at predetermined locations are inserted into predetermined tube holes in the tube plate 10'. After positioning the body plate 1
1 to the bottom. At this stage, the body plate 11 and the tube plate 10 on the tube bundle side (located on the lower side when oriented vertically)
Tack weld and fix. Vli) Torso board defeat (3rd
Figure e) After finishing the work with the stand, move the cradle 4 to the body plate 1.
1. Fix to the outer circumferential surface with bolts 6.

Remove all bolts at the joint between station 1 and bundle base. Then, fall down in the reverse order of standing up. Carrying out the main body of the main body. As described above, the insertion of the tube bundle B into the body plate 11 is completed, but according to the present invention, the working time for inserting the tube bundle can be significantly shortened compared to the conventional method. There is no damage to the body plate and the quality of the product can be improved.

Furthermore, when inserting the tube into the tube plate, positioning is performed using several long tube guides, and then short tube guides provided on each tube are used to position the tube.
They can be inserted simultaneously and in one piece, greatly shortening the insertion time.

It has the following advantages, and is particularly effective in assembling large heat exchangers.

[Brief explanation of the drawing]

Fig. 1 is a front view of the station for the bundle insertion device according to the present invention, Fig. 2 is an enlarged view of the tube bundle receiving fitting, Fig. 3 is an explanatory diagram of the tube bundle insertion method, and Fig. 4 is a tube plate receiving ring. 5 is a detailed view of the tube guide, and FIG. 6 shows a method for expanding the tube bundle receiver when the shell plate is lowered. FIG. 7 is a side sectional view just before inserting the tube into the tube plate on the body plate side. In the figure: -B... Tube bundle, 1... Station, 2...
・Luffing table, 3...Tube presser, 4...
... Tube bundle receiving jig, 4a ... Long hole, 5 ... Pivotal part, 6 ... Bolt, 7,
8... ・Hook part (of the hanging wire), 9...
...Tube plate receiving ring, 10...Tube guide, 10'...Tube plate (on the body plate side), 11.
...Body plate, 12... (short) tube guide, 12'... (long) tube guide.

Claims (1)

[Claims] 1. An L-shaped undulating platform is installed on the station base,
The tube bundle assembled in a horizontal position elsewhere is placed horizontally on the lifting table, then raised vertically, and a body plate is mounted from above on the tube bundle in the vertical position, and the long and short A bundle insertion method in a heat exchanger, characterized in that the tubes are integrally inserted into the tube plate using a tube guide.