JP2001304786A - Multiple heat exchanger and method of assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple heat exchanger and a method of assembling the same, of which the assembly in a field is easy and the assembling processes are simplified. SOLUTION: A shop-fabricated tube bank block W is constructed such that a plurality of cooling pipes 6 which are built between tube plates 8 are inserted into and supported by a plurality of pipe support plates 3 which are disposed in the longitudinal direction of the pipes with a given interval therebetween, that a plurality of reinforcing pipes 7 which are disposed at the outer periphery of the plates 3 are inserted into and supported by the plates, and that a plurality of H-shaped steel parts 2 which are located below the plates 3 and extended in the longitudinal direction of the pipes are detachably fixed to a lower portion of the plates 3 in the direction that crosses at right angle to the longitudinal direction of the pipes. The block W is transferred and conveyed into the body of a heat exchanger which has been set up in the field in advance, and assembled after the steel parts 2 are detached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube heat exchanger such as a condenser used in a steam turbine device and a method for assembling the same.

[0002]

2. Description of the Related Art If a turbine exhaust is guided to a closed condenser and cooled by cooling water, steam condenses and its volume is significantly reduced, so that a high vacuum can be obtained. That is, the thermal efficiency is increased by expanding the steam to a low pressure, the amount of heat retained in the low-pressure portion of the steam can be converted to mechanical energy quite effectively, and the thermal efficiency of the steam turbine can be improved.

As this type of condenser, a closed condenser provided with a large number of cooling pipes, an exhaust gas is guided to the condenser, and the surface condenser is cooled and condensed with cooling water passing through the cooling pipe to generate a vacuum, which is often used as a condenser. Are known.

[0004]

However, in recent years, conventional aluminum brass pipes and the like as cooling pipes have difficulty in corrosion resistance, so they are excellent in corrosion resistance, are maintenance-free, can be made thinner, and have good heat conductivity. There is a trend to move to higher titanium pipes, and even existing condensers are being replaced with titanium pipes.

However, when replacing a condenser such as an aluminum brass pipe with a titanium pipe condenser, it is necessary to increase the number of pipe support plates in terms of vibration strength, and it is necessary to exchange one cooling pipe. From, on-site (power plant, etc.)
However, there is a problem that the assembling work becomes large-scale and the process becomes long.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and has as its object to provide a multi-tubular heat exchanger and a method for assembling the same, which facilitates on-site assembly work and can reduce the number of steps. Aim.

[0007]

In order to achieve the above object, a multi-tube heat exchanger according to the present invention comprises a plurality of cooling pipes provided between tube plates, which are separated by a predetermined distance in the longitudinal direction of the tubes. A plurality of pipe supporting plates disposed at the periphery of the pipe supporting plate, and a plurality of reinforcing pipes penetrated and supported between the pipe supporting plates at an outer peripheral portion of the pipe supporting plate; A factory-built pipe group block in which a plurality of steel support members extending below the pipe support plate and extending in the pipe longitudinal direction, which are located below the pipe support plate, are detachably attached in a direction perpendicular to the pipe longitudinal direction, and are previously installed on site. After being transported and carried into the heat exchanger body, the supporting steel material is removed and assembled.

[0008] Further, in the transportation and carrying in, the tube sheet and the tube support plate adjacent to the tube sheet are connected by a plurality of bolts.

[0009] Further, at the time of the transportation and carrying in, a reinforcing plate is temporarily attached between the tube support plates to cover and hide the cooling pipe and the reinforcing pipe.

Further, the cooling pipe and a portion of the tube sheet which is in contact with the refrigerant are manufactured by using titanium.

In the method for assembling a multi-tube heat exchanger according to the present invention, a tube group block having sufficient strength to withstand transportation is manufactured at a factory, and the manufactured tube group block is previously installed on site. Characterized in that it is transported and carried into the heat exchanger body and assembled.

[0012] The tube group block may be replaced with an old tube group in an existing heat exchanger body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multitubular heat exchanger and an assembling method thereof according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a side view of a condenser tube bank block showing an embodiment of the present invention, FIG.
3 is a sectional view taken along the line III-III of FIG. 1, FIG. 4 is a detailed view of a portion A of FIG. 1, FIG. 5 is a detailed view of a portion B of FIG. 1, FIG. FIG. 3 is an enlarged explanatory view of a main part at the time of assembly.

As shown in FIG. 1 to FIG. 3, a plurality of sets (four sets in the figure) of rollable mounts (such as chill tanks) are arranged on the floor of a factory as a pair of left and right sides at predetermined intervals in the front-rear direction.
A pair of left and right H-section steels (as supporting steel materials) 2 extending in the front-rear direction are fixed on 1.

A plurality of pipe support plates 3 are arranged on the H-section steel 2 at predetermined intervals in the front-rear direction, and other pipe support plates except for the front and last pipe support plates 3 among them are provided. As shown in FIG. 4, the lower part of the plate 3 is connected to the L-shaped bracket 4 mounted on the H-section steel 2 by bolts 5.

The tube support plate 3 is made of a perforated plate made of carbon steel and has a substantially trapezoidal outer shape. A large number of cooling tubes 6 are penetrated and supported slidably in the front-rear direction over substantially the entire surface of the tube supporting plate 3 (see cooling tube group 6A in FIG. 3). Reinforcing pipes (dummy rods) 7 larger in diameter than the cooling pipes 6 penetrate through the pipe support plate 3 at four corners on the outer periphery and at the middle part in the height direction of both the left and right parts, so that each pipe is penetrated. It is welded to the support plate 3.

The cooling pipe 6 is made of a thin tube made of titanium, and the reinforcing pipe 7 is made of carbon steel. The diameter and number of the reinforcing pipes 7 are set so as not to obstruct the flow of steam (turbine exhaust).

Both front and rear ends of the cooling pipes 6 are penetrated by a tube sheet 8 disposed in front of the front tube support plate 3 and a tube sheet 8 disposed behind the last tube support plate 3, respectively. To be welded to each tube sheet 8.

The tube sheet 8 is formed of a clad plate of carbon steel and titanium, and the surface in contact with cooling water (sea water) is formed of titanium. The tube sheet 8 and the tube support plate 3 adjacent thereto
Are connected by a number of bolts 9 (see FIG. 4).

Each of the tube support plates 3 except for the foremost and rearmost portions is provided.
As shown also in FIG. 5, a reinforcing plate 10 is temporarily attached between the cooling pipes 6 and covers the cooling pipes 6 and the reinforcing pipes 7 to shield them from the outside.

An appropriate number of air tubes (bleeding tubes), not shown, are penetrated and supported in the tube sheet 8 and the tube support plate 3 in the front-rear direction as before, and fixed to each tube support plate 3 by welding or the like. You.

In this way, the tube bank block W is manufactured at the factory, then transported by sea, etc., and as shown in FIG. 6, the body of the existing condenser 20 installed at the site (power generation plant or the like) is installed. (Shell) Replaced with an old tube group having an aluminum brass tube cooling tube in 21.

Therefore, in the present embodiment, the work on site is the work of removing the old tube bank and the loading / unloading of the tube tube block W manufactured at the factory.
Since only assembly work is required and no special skill is required for these works, on-site assembly work is extremely easy and the process can be greatly shortened.

In this embodiment, a pair of left and right H-shaped steel members 2 attached to the lower part of each tube support plate 3 with bolts 5 via L-shaped brackets 4 when transporting and carrying in the tube group block W. , Temporary shell (shell) 21 in condenser 20
Therefore, it exerts a sufficient reinforcing effect on the deformation and bending (force) at the time of transportation and carry-in.

In this case, the rigidity of the tube bank block W is as follows.
It is held by a reinforcing pipe 7 together with an air pipe (not shown), so that stable and smooth transportation and carry-in are performed. Further, the reinforcing plate 10 prevents interference between the cooling pipe 6 and the reinforcing pipe 7 at the time of the transportation and carry-in, and prevents the cooling pipe 6 and the reinforcing pipe 7 from being damaged. Further, since the tube sheet 8 is temporarily connected to the tube support plate 3 with a large number of bolts 9, the tube sheet 8 and the cooling pipe 6 do not move relative to the tube support plate 3 and the like during the transportation and carry-in. Stable transportation and import are performed.

Further, the H-shaped steel 2 can be rolled through the gantry 1 at the time of the transportation and loading, and can also be used as a lower suspension beam, so that there is a high degree of freedom in transporting and loading.

Further, an H-shaped steel 2 as the reinforcing material
Since the reinforcing pipe 7 is a wire and the reinforcing plate 10 is a thin plate, it can be reinforced compactly and can reduce interference with other objects during transportation and carry-in.

In carrying out the work at the site, first, an old pipe group (not shown) having an aluminum brass pipe cooling pipe is introduced from the body 21 of the existing condenser 20 in the steam turbine facility shown in FIG. It is removed together with the chamber 22 and the outlet water chamber 23.

At this time, the pitch of the tube support plate 3 is different between the aluminum brass tube cooling tube and the titanium tube cooling tube 6 (the pitch of the tube support plate 3 is lower because the titanium tube cooling tube 6 has lower strength). Therefore, the reinforcing beam (not shown) for fixing and holding the tube support plate 3 is replaced.

From the above state, the tube block W conveyed to the front of the building is rolled through the gantry 1 under the H-section steel 2, passed through the backwash valve pit 24, and carried into the building, and It is put on the elevating table 25 in 21.

Thereafter, the jack 26 is contracted and the lift 25
Is lowered, and the lower part of each tube support plate 3 is fixed and held on the reinforcing beam, so that the tube group block W is set at a predetermined position in the trunk 21.

Thereafter, the H-shaped steel 2 and the reinforcing plate 10 are detached and carried out of the building, and the bolts 9 are removed so that the tube sheet 8 and the cooling pipe 6 can be allowed to thermally expand and contract. Incidentally, the reinforcing plate 10 may be removed before being carried into the building.

After that, if the removed inlet side water chamber 22 and outlet side water chamber 23 are attached to the body 21 again, the pipe group is made of titanium pipes, has high heat conductivity, and is corroded by cooling water (seawater). Assembly of the low maintenance free condenser 20 is completed.

The present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention.
For example, the present invention may be applied to a newly installed condenser in place of the existing condenser, or the present invention may be applied to a multi-tube heat exchanger other than the condenser.

[0036]

As described above in detail with reference to the embodiments, the multi-tube heat exchanger according to the first aspect of the present invention comprises a plurality of cooling pipes extending between pipe plates, In the direction, a plurality of pipe supporting plates disposed at predetermined intervals are penetrated and supported, and a plurality of reinforcing pipes are located between the pipe supporting plates at the outer peripheral portion of the pipe supporting plate. A factory-manufactured tube group block having a plurality of support steel members which are supported and extend below the tube support plate and extend in the longitudinal direction of the tube below the tube support plate in a direction perpendicular to the longitudinal direction of the tube. To
It is characterized by removing and assembling the supporting steel material after transporting and transporting it into the heat exchanger body installed in advance on the site, so the on-site work is only for loading and assembling the factory-manufactured tube bank block Since no special skills are required for these operations, on-site assembly work is extremely easy and the process can be greatly shortened. In addition, at the time of the transportation and carry-in, the reinforcing pipe and the supporting steel material exhibit a sufficient reinforcing action against deformation and bending (force), and a compact reinforcing structure is achieved.

In the multi-tube heat exchanger according to a second aspect of the present invention, at the time of the transportation and carrying-in, the tube plate and the tube support plate adjacent to the tube plate are connected by a plurality of bolts. Since the tube plate and the cooling pipe do not move relative to the tube support plate or the like at the time of the transportation / loading, stable transportation / loading is performed. After carrying in, by removing the bolts, the thermal expansion and contraction of the tube sheet and the cooling pipe can be allowed.

In the multi-tubular heat exchanger according to a third aspect of the present invention, a reinforcing plate is temporarily attached between the tube support plates during the transportation and carry-in so as to cover and cover the cooling pipe and the reinforcing pipe. Therefore, interference with the cooling pipe and the reinforcing pipe at the time of the transportation and carry-in is prevented, and the cooling pipe and the reinforcing pipe are prevented from being damaged.

The multi-tube heat exchanger according to a fourth aspect of the present invention is characterized in that the cooling pipe and the portion of the tube sheet in contact with the refrigerant are manufactured using titanium, so that the heat transfer property is improved. A maintenance-free heat exchanger that is high and less corroded by cooling water (seawater) is realized.

According to a fifth aspect of the present invention, in the method for assembling a multi-tube heat exchanger, a tube group block having a strength enough to withstand transportation is manufactured at a factory, and the manufactured tube group block is prepared in advance. It is characterized by being transported and carried into the heat exchanger body installed at the site and assembled, so the work on site is only the loading and assembling work of the factory-made pipe block, and special Since no skill is required, on-site assembly work is extremely easy and the process can be greatly shortened.

In the method for assembling a multi-tube heat exchanger according to claim 6 of the present invention, the tube group block is replaced with an old tube group in an existing heat exchanger body. In this case, the assembling work is very easy and the process can be greatly shortened.

[Brief description of the drawings]

FIG. 1 is a side view of a condenser tube bank block showing one embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a detailed view of a portion A in FIG. 1;

FIG. 5 is a detailed view of a portion B in FIG. 1;

FIG. 6 is an explanatory view at the time of assembly.

FIG. 7 is an enlarged explanatory view of a main part during assembly.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base 2 H-section steel 3 pipe support plate 4 L bracket 5 bolt 6 cooling pipe 6 A cooling pipe group 7 reinforcing pipe 8 pipe sheet 9 bolt 10 reinforcing plate 20 condenser 21 body 22 inlet side water chamber 23 outlet side water chamber 24 Backwash valve pit 25 Elevator 26 Jack W Tube block

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L065 AA17 AA27 3L103 AA02 AA12 BB05 CC02 CC03 CC30 DD08 DD44 DD63 DD82 DD98

Claims (6)

[Claims] 1. A plurality of cooling tubes installed between tube plates are penetrated and supported by a plurality of tube support plates arranged at predetermined intervals in a longitudinal direction of the tubes, and a plurality of cooling tubes are provided between the tube support plates. A plurality of reinforcing pipes are penetrated and supported at an outer peripheral portion of the pipe support plate, and a support steel material extending below the pipe support plate and extending in the longitudinal direction of the pipe is provided below the pipe support plate. After transporting and transporting a factory-manufactured tube bank block detachably mounted in a direction perpendicular to the hand direction into a heat exchanger barrel previously installed on site, the supporting steel material is removed and assembled. Characteristic multi-tube heat exchanger. 2. The multi-tube type as claimed in claim 1, wherein said tube plate and a tube support plate adjacent to said tube plate are connected by a plurality of bolts during said transportation and carry-in. Heat exchanger. 3. The multi-purpose device according to claim 1, wherein a reinforcing plate is temporarily attached between the tube supporting plates to cover and cover the cooling tube and the reinforcing tube during the transportation and loading. Tube heat exchanger. 4. The multi-tubular heat exchanger according to claim 1, wherein said cooling pipe and a portion of said tube sheet in contact with the refrigerant are made of titanium. 5. A tube bank block having sufficient strength to withstand transportation is manufactured at a factory, and the manufactured tube bank block is transported and carried into a heat exchanger body previously installed on site and assembled. A method for assembling a multitubular heat exchanger. 6. The method for assembling a multi-tube heat exchanger according to claim 5, wherein the tube group block is replaced with an old tube group in an existing heat exchanger body.