JP2005042960A - Waste heat recovery boiler and its installation method - Google Patents

Abstract

To provide a waste heat recovery boiler that can be blocked within a range that can be transported by land, can be completed at the factory, improve workability at the installation site, and can shorten the installation time, and an installation method thereof.
In an exhaust heat recovery boiler in which a large number of heat transfer tubes are arranged in a duct having a rectangular cross section, a plurality of heat transfer tubes are coupled to a plate body 22 constituting a part of the ceiling plate of the duct. The heat tube panel block 24 was formed, the heat transfer tube panel block 24 was inserted and disposed in the duct 26, and the plate 22 was a part of the ceiling plate.
[Selection] Figure 2

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust heat recovery boiler and a method for installing a heat transfer tube panel in a duct in the exhaust heat recovery boiler.
[0002]
[Prior art]
In recent years, from the viewpoint of energy saving, combined cycle power plants tend to be employed to improve power generation efficiency. In the combined cycle power plant, in addition to the power generation by the gas turbine, the heat of the exhaust gas from the gas turbine is recovered by the exhaust heat recovery boiler to generate steam, and the steam is used to generate power by the steam.
[0003]
FIG. 11 is a diagram showing an example of the structure of a general exhaust heat recovery boiler, and the entire boiler is formed with a duct 1 so as to allow exhaust gas to pass through, and its height and width are 10 to 20 m in size. have. In the duct, high-pressure superheater 2, high-pressure evaporator 3, low-pressure superheater 4, high-pressure economizer 5, low-pressure evaporator 6, low-pressure economizer 7 are arranged in order from the exhaust gas flow direction. . A high-pressure drum 8 and a low-pressure drum 9 are disposed in the upper part of the duct. Each heat exchanger is composed of one or a plurality of heat transfer tube panels in which a large number of heat transfer tubes are arranged, and they may be supported at the lower part of the duct or suspended from the upper part of the duct. On the other hand, since the duct needs to support internal and external devices, a steel material 10 extending in the circumferential direction is provided outside the duct, and the load of the heat transfer tube panel is supported by the steel material 10.
[0004]
Conventionally, waste heat recovery boilers for domestic power plants have been generally assembled at the factory and shipped as large modules including ducts, heat transfer tube panels, and equipment around the ducts (for example, Patent Document 1 to Patent Document 3).
[0005]
However, recently, the demand for inland power plants and cogeneration plants has increased, and it is difficult to transport large cargo, so small parts are brought into the installation site and most of the assembly work is performed at the installation site. There is a tendency to increase. In this case, the installation at the installation site will take more time and money than when shipping in the form of a large module at the factory, but in particular, the installation of the heat transfer tube panel in the duct will be performed at the installation site. When performing, since there are many heat transfer tube panels, it takes time, As a result, installation requires much time and there exists a bad effect, such as an increase in construction cost.
[0006]
[Patent Document 1]
JP 2003-210903 A [Patent Document 2]
JP-A-11-241804 (2nd page, 2nd column, FIG. 8)
[Patent Document 3]
Japanese Patent Laid-Open No. 10-205705 (page 6, column 10, FIGS. 16 to 17)
[0007]
[Problems to be solved by the invention]
In view of these points, the present invention is a waste heat recovery boiler that can be blocked within a range that can be transported by land, increases the degree of completion in the factory, improves the workability at the installation site, and shortens the installation time. It aims to provide a method.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a waste heat recovery boiler in which a large number of heat transfer tubes are arranged in a duct having a rectangular cross section, and the top wall of the plate body that constitutes a part of the ceiling plate of the duct. The heat transfer tube panel block is formed by being coupled to, and the block is inserted and disposed in the duct.
[0009]
The invention according to claim 2 is the invention according to claim 1, wherein the beam member for suspending the heat transfer tube is provided on the plate body to which the plurality of heat transfer tubes are coupled, and the beam member for suspending the heat transfer tube is disposed on the outer periphery of the duct. The reinforcing beam member is disposed between the upper and lower reinforcing beam members orthogonal to the duct axis, and the end of the heat transfer tube hanging beam member is connected to the upper reinforcing beam member. And
[0010]
The invention according to claim 3 is the invention according to claim 1, wherein the heat transfer tube suspension beam material is provided on the plate body to which the plurality of heat transfer tubes are coupled, and the end portion of the heat transfer tube suspension beam material is provided. The reinforcing beam members arranged on the outer periphery of the duct are engaged with the upper and lower upper reinforcing beam members perpendicular to the axis of the duct, and the ends of the heat transfer tube hanging beam members are connected to the upper reinforcing beam members. It is characterized by that.
[0011]
According to a fourth aspect of the present invention, in the method for installing an exhaust heat recovery boiler in which a large number of heat transfer tubes are arranged in a duct having a rectangular cross section, a plurality of heat transfer tubes constitute a part of the ceiling plate of the duct. The heat transfer tube panel block is formed by being coupled to the plate body to be arranged, the block is arranged in the duct in the axial direction, and the plate body of the heat transfer tube panel block is connected to the duct.
[0012]
The invention according to claim 5 is the invention according to claim 4, wherein the heat transfer tube panel block is formed by connecting the plurality of heat transfer tubes to a plate constituting a part of the ceiling plate of the duct. Then, it is carried into the installation site, and is vertically placed at the installation site and inserted into the duct.
[0013]
The invention according to claim 6 is the invention according to claim 5, wherein the heat transfer tube panel block in which a plurality of heat transfer tubes are coupled to a plate constituting a part of the ceiling plate of the duct is placed horizontally and carried to the installation site. It is characterized in that it is lifted by using two cranes at the installation site, rotated 90 degrees in the air, and placed vertically in a duct.
[0014]
The invention according to claim 7 is the invention according to claim 5, wherein the heat transfer tube panel block in which a plurality of heat transfer tubes are coupled to a plate constituting a part of the ceiling plate of the duct is placed horizontally and carried to the installation site. , It is characterized in that it is rotated 90 degrees vertically using a raising tool and one crane at the installation site, and is inserted into a duct.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
FIG. 1 is a perspective view showing a schematic configuration of a heat transfer tube portion used in the exhaust heat recovery boiler of the present invention, in which a plurality of heat transfer tubes are arranged in a flat plate shape to form a heat transfer tube panel 21, and the heat transfer tube One or more panels 21 are bundled. The heat transfer tube panel 21 in which one or a plurality of sheets are bundled is connected to a plate body 22 constituting a part of a ceiling plate of a duct, which will be described later, by a support 23, and on the outer surface side of the plate body 22. Is mounted with a heat transfer tube hanging beam 24 extending in a direction perpendicular to the surface of the heat transfer tube panel 21, thereby forming a heat transfer tube panel block 25.
[0017]
On the other hand, as shown in FIG. 2, the duct 26 formed in a rectangular cross section through which the exhaust gas passes has only the side walls 27 and the bottom wall 28 installed in the middle of the installation work of the exhaust heat recovery boiler. Is not provided with a ceiling plate, and an opening 29 is formed there. A pair of left and right vertical reinforcing beam members 30a are mounted on the outer surfaces of the both side walls 27, and a pair of left and right horizontal reinforcing beam members 30b are mounted on the lower surface of the bottom wall 28. The top portions of the reinforcing beam members 30a are connected by an upper reinforcing beam member 30c orthogonal to the axis of the duct 26.
[0018]
In installing the exhaust heat recovery boiler, after installing the duct without the ceiling plate as described above, the heat transfer tube panel block 25 is lifted by a crane, and the heat transfer tube panel block 25 is removed from the opening 29. The heat transfer tube panel is suspended by hanging in the duct, sealing the opening 29 with the plate 22 of the heat transfer tube panel block 25, and fixing both ends of the heat transfer tube suspension beam member 24 to the upper reinforcing beam member 30c. Installation of block 25 can be performed. Therefore, a large number of heat transfer tubes can be installed at one time, and the working time can be shortened.
[0019]
FIG. 3 is a diagram showing a second embodiment of the present invention. In the middle stage of the installation work of the exhaust heat recovery boiler, the duct is provided with only one side wall 27 and the bottom wall 28, and the other side. The side walls and the ceiling plate are not installed, and only the reinforcing beam members 30a and 30b and the upper reinforcing beam member 30c are installed.
[0020]
In this case as well, as in the first embodiment, the heat transfer tube panel block 25 is inserted from the opening 29b on the side surface of the duct, so that a large number of heat transfer tubes are once formed in the same manner as in the first embodiment. Therefore, it is possible to reduce the working time and to reduce the size of the crane because it is not necessary to lift the heat transfer tube panel block 25 above the duct.
[0021]
FIG. 4 is a diagram showing a third embodiment of the present invention. In the middle stage of the installation work of the exhaust heat recovery boiler, the duct is composed of the bottom wall 28 and the reinforcing beam member 30a as in the first embodiment. 30b and the upper reinforcing beam member 30c are installed, and the side walls and the ceiling plate are not installed.
[0022]
Thus, by inserting the same heat transfer tube panel block 25 as in the first embodiment from the opening 29b on the side surface of the duct, in addition to the same effect as in the second embodiment, the heat transfer tube panel block 25 is changed. It becomes possible to insert from both sides of the duct, and in the exhaust heat recovery boiler in which a plurality of heat transfer tube panel blocks 25 are arranged in the lateral direction, the work space can be effectively used.
[0023]
FIG. 5 is a diagram showing a state when the heat transfer tube panel block 25 is carried in at the installation site. The heat transfer tube panel block 25 is horizontally placed in the transport reinforcement frame 31 and shipped and installed in a block state. Carry in.
[0024]
6 (a), 6 (b), and 6 (c), the heat transfer tube panel block 25 is lifted with a crane or the like from the state shown in FIG. Attach the jig 32 to the front and rear parts by two cranes and rotate them 90 degrees to stand the heat transfer tube panel block 25 vertically. Then, it is inserted and mounted in the duct as described above. Here, the raising jig 32 can also be used as the transportation reinforcing frame 31 of the heat transfer tube panel block of FIG.
[0025]
Therefore, according to the present embodiment, compared with the case where the heat transfer tube panels are transported and installed one by one, the number of transportation is reduced, so that there is an effect such as reduction in transportation cost and work on the installation site. .
[0026]
7 and 8 show a method of rotating 90 degrees from the state of FIG. 4 at the installation site and lifting it with a crane or the like from the state of FIG. 4, and the heat transfer tube panel block 25 is the same as that of the fourth embodiment. It is attached to the jig 32 for raising 90 degrees like the form. This jig has a hinge 33 or a rotatable surface 34 at the end, and lifts the opposite side of the hinge or rotatable surface with one crane and rotates it 90 degrees to make the heat transfer tube panel vertical. Stand up.
[0027]
Thus, according to the present embodiment, in addition to the effects of the fourth embodiment, there is an effect such as a reduction in work cost since only one crane is required, and an increase in safety because aerial work is reduced. is there.
[0028]
FIG. 9 shows a method of connecting the duct and the heat transfer tube panel block after the heat transfer tube panel block is inserted into the duct. The heat transfer tube panel block 25 inserts the heat transfer tube hanging beam 24 mounted on the plate 22 constituting the duct ceiling portion between the upper reinforcing beam members 30c, and both ends of the heat transfer tube hanging beam 24. Is fixed to the upper reinforcing beam member 30c through a connecting plate 35 by bolts or welding.
[0029]
FIG. 10 shows the connection method of the duct and the heat transfer tube panel block as in the seventh embodiment. The beam material 25 for suspending the heat transfer tube at the duct ceiling portion is the above-described upper reinforcing beam material 30c. It is connected by putting it on.
[0030]
Thus, in the sixth embodiment, when the heat transfer tube panel block 25 lifted by the crane is inserted into the duct, the connection between the heat transfer tube hanging beam member 24 and the upper reinforcing beam member 30c is completed. Although the crane cannot be separated, according to the present embodiment, the crane can be separated simply by placing the heat transfer tube hanging beam 24 on the upper reinforcing beam 30c. Can be greatly shortened.
[0031]
【The invention's effect】
Since the present invention is configured as described above, when assembling an exhaust heat recovery boiler in which a large number of heat transfer tube panels are arranged in the duct at the installation site, the work is performed in comparison with the case where the heat transfer tube panels are installed one by one. The number is reduced and the number of times of lifting the heat transfer tube panel by the crane is reduced. In addition, the construction period can be shortened and the installation cost can be reduced.
[0032]
Furthermore, since the installation of the heat transfer tube support device at the installation site is not required, the time for working at high places can be shortened, and the safety can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a heat transfer tube panel block according to the present invention.
FIG. 2 is a view showing a duct installation method and a heat transfer tube panel block insertion method in the duct according to the present invention.
FIG. 3 is a diagram showing a duct installation method and a heat transfer tube panel block insertion method in the duct according to the second embodiment of the present invention.
FIG. 4 is a diagram showing a duct installation method and a heat transfer tube panel block insertion method in the duct according to the second embodiment of the present invention.
FIG. 5 is a view showing a state in which a heat transfer tube panel block according to the present invention is inserted into a transportation reinforcing frame.
FIGS. 6A, 6B, and 6C are views showing a heat transfer tube panel block raising method according to the present invention.
FIGS. 7A, 7B, and 7C are views showing a heat transfer tube panel block raising method according to the present invention.
8A, 8B, and 8C are views showing a heat transfer tube panel block raising method according to the present invention.
FIG. 9 is a view showing a heat transfer tube panel block and a duct connecting method according to the present invention.
FIG. 10 is a view showing a heat transfer tube panel block and a duct connecting method according to the present invention.
FIG. 11 is a schematic cross-sectional view of an exhaust heat recovery boiler.
[Explanation of symbols]
21 Heat Transfer Tube Panel 22 Plate 23 Support 24 Heat Transfer Tube Hanging Beam 25 Heat Transfer Tube Block 26 Duct 27 Side Wall 28 Bottom Wall 29 Opening 30a, 30b Reinforcement Beam 30c Upper Reinforcement Beam 31 Transport Reinforcement Frame 32 Raising jig 33 Hinge 34 Rotating surface

Claims (7)

In a waste heat recovery boiler with a large number of heat transfer tubes arranged in a duct having a rectangular cross section, a plurality of heat transfer tubes are joined to a plate that forms part of the ceiling plate of the duct to form a heat transfer tube panel block And an exhaust heat recovery boiler in which the heat transfer tube panel block is inserted and disposed in the duct. A heat transfer tube suspension beam is provided on a plate body in which a plurality of heat transfer tubes are coupled, and the heat transfer tube suspension beam is disposed before and after the axis of the duct in the reinforcing beam disposed on the outer periphery of the duct. 2. The exhaust heat recovery boiler according to claim 1, wherein the exhaust heat recovery boiler is disposed between the upper reinforcing beam members and an end portion of the heat transfer tube hanging beam member is connected to the upper reinforcing beam member. A beam member for suspending the heat transfer tube is provided on a plate body in which a plurality of heat transfer tubes are coupled, and the end of the beam member for suspending the heat transfer tube is connected to the axis of the duct in the reinforcing beam member disposed on the outer periphery of the duct The exhaust heat recovery boiler according to claim 1, wherein the exhaust heat recovery boiler is engaged on upper and lower upper reinforcing beam members orthogonal to each other, and an end of the heat transfer tube hanging beam member is connected to the upper reinforcing beam member. In a method for installing an exhaust heat recovery boiler in which a large number of heat transfer tubes are arranged in a duct having a rectangular cross section, a plurality of heat transfer tubes are coupled to a plate body that forms a part of the ceiling plate of the duct, and a heat transfer tube panel An exhaust heat recovery boiler installation method comprising: forming a block, arranging the block in an axial direction in a duct, and connecting a plate of a heat transfer tube panel block to the duct. A plurality of heat transfer tubes are joined to a plate that forms part of the ceiling plate of the duct to form a heat transfer tube panel block, and this block is placed horizontally and carried to the installation site. The exhaust heat recovery boiler installation method according to claim 4, wherein the exhaust heat recovery boiler is inserted into the exhaust heat recovery boiler. A heat transfer tube panel block in which a plurality of heat transfer tubes are joined to a plate constituting a part of the ceiling plate of the duct is placed horizontally and carried to the installation site, lifted by using two cranes at the installation site, and 90 in the air. The exhaust heat recovery boiler installation method according to claim 5, wherein the exhaust heat recovery boiler is inserted vertically into the duct. A heat transfer tube panel block, in which a plurality of heat transfer tubes are joined to a plate that forms part of the ceiling plate of the duct, is placed horizontally and carried to the installation site, and a standing jig and one crane are used at the installation site. The method for installing an exhaust heat recovery boiler according to claim 5, wherein the exhaust heat recovery boiler is rotated 90 degrees vertically and inserted into a duct.

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