JP4175449B2 - Multi-tube heat exchanger and its assembly method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-tube heat exchanger such as a condenser used in a steam turbine apparatus and an assembling method thereof.
[0002]
[Prior art]
If the turbine exhaust is led to a sealed condenser and cooled with cooling water, the 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, and the amount of heat retained in the low pressure portion of the steam can be converted to mechanical energy quite effectively, so that the thermal efficiency of the steam turbine can be improved.
[0003]
As this kind of condenser, there is a well-known surface condenser which is a hermetically sealed container having a large number of cooling pipes, which leads to exhaust and cools and condenses it with cooling water passing through the cooling pipes to generate a vacuum. Yes.
[0004]
[Problems to be solved by the invention]
By the way, as a conventional cooling pipe, the conventional aluminum brass pipe has a difficulty in corrosion resistance, so it has become a trend to shift to a titanium pipe that is excellent in corrosion resistance and maintenance-free, and is thinned and has high heat conductivity. Even in existing condensers, titanium pipes are being replaced.
[0005]
However, when replacing a condenser such as an aluminum brass pipe with a titanium pipe condenser, it is necessary to increase the pipe support plate in terms of vibration strength, and it is necessary to replace the cooling pipe. There has been a problem that assembly work at a power plant or the like becomes large-scale and the process becomes long.
[0006]
The present invention has been made in view of the above-described prior art, and an object of the present invention is to provide a multi-tubular heat exchanger that can be easily assembled on site and can be shortened, and an assembling method thereof. .
[0007]
[Means for Solving the Problems]
In order to achieve such an object, a multi-tube heat exchanger according to the present invention includes a plurality of tubes arranged with a plurality of cooling tubes installed between tube plates spaced apart from each other by a predetermined distance in the tube longitudinal direction. Pipe support that allows the support plate to pass through and support, and allows a plurality of reinforcing pipes to pass between and support the pipe support plates at the outer periphery of the tube support plate, and excludes those adjacent to the tube plate A factory-manufactured tube group block with a plurality of support steel members extending under the pipe support plate and extending in the pipe longitudinal direction in a direction perpendicular to the pipe longitudinal direction is removably attached to the lower part of the plate. After transporting and carrying in the heat exchanger cylinder, the support steel material is removed and assembled, and at the time of transporting and carrying in, a tube plate and a tube support plate adjacent to the tube plate have a plurality of bolts. It is characterized by being combined with.
[0009]
In addition, a reinforcing plate is temporarily attached between the tube support plates at the time of transporting / carrying in, and the cooling tube and the reinforcing tube are covered and hidden.
[0010]
In addition, the cooling pipe and the portion of the tube plate in contact with the refrigerant are manufactured using titanium.
[0011]
The method of assembling a multi-tube heat exchanger according to the present invention is to manufacture a tube group block having a strength sufficient to withstand transportation at the factory when the multi-tube heat exchanger described above is assembled. It is characterized in that the tube group block is transported and carried into a heat exchanger cylinder installed in the field in advance.
[0012]
The tube group block is replaced with an old tube group in an existing heat exchanger cylinder.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the multi-tube heat exchanger and its assembling method according to the present invention will be described in detail with reference to the accompanying drawings.
[0014]
[Example]
1 is a side view of a condenser tube group block showing an embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. FIG. 5 is a detailed view of part B of FIG. 1, FIG. 6 is also an explanatory view at the time of assembly, and FIG. 7 is an enlarged explanatory view of the main part at the same time of assembly.
[0015]
As shown in FIG. 1 to FIG. 3, on a rollable base (such as a chill tank) 1 arranged in a plurality of sets (four sets in the figure) at a predetermined interval in the front-rear direction on the factory floor. A pair of left and right H-sections (as support steel members) 2 extending in the front-rear direction are fixed.
[0016]
On the H-shaped steel 2, a plurality of tube support plates 3 are arranged at a predetermined interval in the front-rear direction, and other tube support plates 3 except for the foremost and last tube support plates 3 of them are arranged. As shown in FIG. 4, the lower part is connected to an L-shaped bracket 4 attached on the H-section steel 2 with bolts 5.
[0017]
The tube support plate 3 is made of a carbon steel perforated plate and has a substantially trapezoidal outer shape. Between the tube support plates 3, a large number of cooling tubes 6 are pierced and supported so as to be slidable in the front-rear direction over substantially the entire surface of the tube support plate 3 (see the cooling tube group 6A in FIG. 3). Reinforcing pipes (dummy rods) 7 having a diameter larger than that of the cooling pipe 6 are penetrated through a total of six places, the four corners of the outer periphery of the pipe support plate 3 and the middle part in the height direction of both the left and right parts. It is welded to the support plate 3.
[0018]
The cooling pipe 6 is made of a titanium thin pipe, 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).
[0019]
The front and rear ends of each cooling pipe 6 are respectively penetrated through a tube plate 8 disposed in front of the frontmost tube support plate 3 and a tube plate 8 disposed behind the last tube support plate 3. It is welded to the tube sheet 8.
[0020]
The tube plate 8 is formed of a clad plate of carbon steel and titanium, and the surface in contact with the cooling water (seawater) is formed of titanium. The tube plate 8 and the adjacent tube support plate 3 are coupled by a large number of bolts 9 (see FIG. 4).
[0021]
Further, as shown in FIG. 5, a reinforcing plate 10 is temporarily attached between the tube support plates 3 except the frontmost portion and the rearmost portion, covering the cooling tubes 6 and the reinforcing tubes 7 to shield them from the outside. is doing.
[0022]
An appropriate number of air tubes (bleeding tubes) (not shown) are penetrated and supported in the longitudinal direction in the tube plate 8 and the tube support plate 3 as before, and are fixed to the tube support plates 3 by welding or the like.
[0023]
In this way, the tube group block W is manufactured at the factory, and then transported by sea, and as shown in FIG. 6, the shell (shell) in the existing condenser 20 installed at the site (power plant, etc.). The old pipe group having the aluminum brass pipe cooling pipe in 21 is replaced.
[0024]
Therefore, in this embodiment, the work at the site is only the removal work of the old pipe group and the loading / assembly work of the pipe group block W manufactured by the factory, and these work does not require special skills. Assembling work is easy and drastically shortens the process.
[0025]
In this embodiment, when the tube group block W is transported or carried in, a pair of left and right H-sections 2 attached to the lower portion of each tube support plate 3 with bolts 5 via L-shaped brackets 4 are condensed water. In order to serve as a temporary body (shell) 21 in the container 20, it exerts a sufficient reinforcing action against deformation and bending (force) at the time of transportation and carry-in.
[0026]
Further, the rigidity of the tube group block W at this time is maintained by the reinforcing tube 7 together with an air tube (not shown), so that stable and smooth transportation and carry-in are performed. Further, the reinforcing plate 10 prevents interference with the cooling pipe 6 and the reinforcing pipe 7 at the time of transportation and carry-in, so that the cooling pipe 6 and the reinforcing pipe 7 can be prevented from being damaged. In addition, since the tube plate 8 is temporarily coupled to the tube support plate 3 with a large number of bolts 9, the tube plate 8 and the cooling pipe 6 do not move relative to the tube support plate 3 and the like during the transportation and loading. Stable transportation and carry-in are performed.
[0027]
Further, the H-shaped steel 2 can be rolled via the gantry 1 during the transportation and loading, and can also be used as a hanging beam at the bottom, so that there is a degree of freedom in transportation and loading work.
[0028]
Furthermore, since the H-shaped steel 2 and the reinforcing tube 7 as the reinforcing material are wires, and the reinforcing plate 10 is a thin plate, it can be reinforced compactly and reduce interference with other objects during transportation and carry-in. be able to.
[0029]
In carrying-in work at the site, first, an old pipe group (not shown) having an aluminum brass cooling pipe from the trunk 21 of the existing condenser 20 in the steam turbine facility shown in FIG. It is removed together with the outlet side water chamber 23.
[0030]
At this time, the pitch of the tube support plate 3 is different between the aluminum tube cooling tube and the titanium tube cooling tube 6 (the strength of the titanium tube cooling tube 6 is lower, so the pitch of the tube support plate 3 is narrow and the number of the tube support plates 3 is smaller. Therefore, the reinforcement beam (not shown) for fixing and holding the tube support plate 3 is replaced.
[0031]
From the above state, the tube group block W transported in front of the building is rolled through the gantry 1 under the H-section steel 2, passes through the backwash valve pit 24, is carried into the building, and is further moved into the body 21. Put it on the lift 25.
[0032]
Thereafter, the jack 26 is shrunk to lower the lifting platform 25 and the lower portion of each tube support plate 3 is fixed and held to the reinforcing beam, whereby the tube group block W is set at a predetermined position in the trunk 21.
[0033]
Thereafter, the H-section steel 2 and the reinforcing plate 10 are removed and carried out of the building, and the bolts 9 are removed so that thermal expansion and contraction of the tube plate 8 and the cooling tube 6 can be allowed. In addition, you may remove the reinforcement board 10 before carrying in in a building.
[0034]
After that, if the removed inlet-side water chamber 22 or outlet-side water chamber 23 is reattached to the barrel 21, it has a tube group made of titanium pipes, has high heat conductivity, and has little corrosion caused by cooling water (seawater). Assembling of the condenser 20 is completed.
[0035]
In addition, this invention is not limited to the said Example, A various change is possible in the range which does not deviate from the summary of this invention. For example, the present invention may be applied to a newly installed condenser instead of an existing condenser, or to a multi-tube heat exchanger other than the condenser.
[0036]
【The invention's effect】
As described above in detail based on the embodiments, the multi-tube heat exchanger according to the present invention is provided with a large number of cooling pipes installed between the tube plates at a predetermined interval in the longitudinal direction of the pipe. Penetrated and supported by a plurality of pipe support plates, and a plurality of reinforcing pipes penetrated and supported between the tube support plates at the outer periphery of the tube support plates, and adjacent to the tube plates A tube group block manufactured at the factory, in which a plurality of supporting steel members, which are located below the pipe support plate and extend in the longitudinal direction of the pipe, are detachably attached in a direction perpendicular to the longitudinal direction of the pipe, below the pipe support plate. In addition, after transporting and carrying in a heat exchanger cylinder installed in advance, the support steel material is detached and assembled, and at the time of transporting and carrying in, a tube plate and a tube support plate adjacent to the tube plate since wherein the bets is coupled by a plurality of bolts, work at the site There need only loading and assembly of the tube bundle block of factory production, since it does not require also special skill in these tasks, thereby be significantly reduced assembly work is extremely easy process in the field. Further, at the time of transportation and carry-in, the reinforcing pipe and the supporting steel material exhibit a sufficient reinforcing action against deformation and bending (force), while a compact reinforcing structure is achieved. In addition, the tube plate and the cooling pipe do not move relative to the tube support plate or the like during the transportation / carrying-in, and stable transportation / carry-in is performed. After carrying in, the expansion and contraction of the tube plate and the cooling tube can be allowed by removing the bolt.
[0038]
In addition, a reinforcing plate is temporarily attached between the tube support plates at the time of transportation / carrying in, and the cooling pipe and the reinforcing pipe are covered, so that the cooling pipe at the time of transportation / carrying-in Interference with other objects of the reinforcing pipe is prevented, and damage to the cooling pipe and the reinforcing pipe is avoided in advance.
[0039]
In addition, since the cooling tube and the portion of the tube plate in contact with the refrigerant are made of titanium, a maintenance-free heat exchanger having high heat transfer and less corrosion due to cooling water (seawater) is provided. Realized.
[0040]
The method for assembling the multi-tube heat exchanger according to the present invention is to manufacture a tube group block having a strength sufficient to withstand transportation when assembling the above-described multi-tube heat exchanger at the factory. Since the tube group block is transported and carried in a heat exchanger cylinder installed in the field in advance, the work at the site is only the import and assembly work of the tube group block manufactured at the factory. Since no special skill is required for these operations, the assembly work on site is easy and the process can be greatly shortened.
[0041]
Further, since the tube group block is replaced with the old tube group in the existing heat exchanger cylinder, assembly work at the time of replacement is easy and the process can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a side view of a condenser tube group block showing an embodiment of the present invention.
FIG. 2 is a plan view of the same.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a detailed view of part A in FIG. 1; FIG.
FIG. 5 is a detailed view of part B of FIG.
FIG. 6 is an explanatory view during assembly.
FIG. 7 is an enlarged explanatory view of main parts during assembly.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 H-shaped steel 3 Tube support plate 4 L bracket 5 Bolt 6 Cooling tube 6A Cooling tube group 7 Reinforcement tube 8 Tube plate 9 Bolt 10 Reinforcement plate 20 Condenser 21 Body 22 Inlet side water chamber 23 Outlet side water chamber 24 Backwash valve pit 25 Lift platform 26 Jack W Tube group block

Claims (5)

A plurality of cooling pipes installed between the tube plates are penetrated and supported by a plurality of tube support plates arranged at a predetermined interval in the longitudinal direction of the tube, and the tube support plates are interposed between these tube support plates. A plurality of reinforcing pipes are penetrated and supported at the outer peripheral portion of the pipe, and are supported below the pipe support plate except for those adjacent to the pipe plate and extending in the longitudinal direction of the pipe. After transporting and carrying in a factory-produced tube group block in which a plurality of steel materials are removably attached in a direction perpendicular to the longitudinal direction of the tube, the support steel material is removed and assembled after being transported and carried into a heat exchanger cylinder installed in the field in advance. In addition, the multi-tube heat exchanger is characterized in that a tube plate and a tube support plate adjacent to the tube plate are coupled by a plurality of bolts at the time of transportation and carry-in .   The multi-tube heat exchanger according to claim 1, wherein a reinforcing plate is temporarily attached between the tube support plates during the transportation and carry-in to cover and hide the cooling tube and the reinforcing tube.   The multi-tube heat exchanger according to claim 1 or 2, wherein the cooling pipe and the portion of the tube plate in contact with the refrigerant are manufactured using titanium. When assembling the multi-tube heat exchanger according to any one of claims 1 to 3, a tube group block having a strength sufficient to withstand transportation is manufactured at a factory, and the manufactured tube group block is preliminarily installed in the field. A method of assembling a multi-tubular heat exchanger, which is assembled by transporting and carrying it in a heat exchanger cylinder installed in a pipe.   5. The assembly method for a multi-tube heat exchanger according to claim 4, wherein the tube group block is replaced with an old tube group in an existing heat exchanger cylinder.

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