JP6292395B2 - Waste heat recovery boiler and method for assembling the same - Google Patents

Description

  The present invention relates to a heat recovery steam generator (HRSG) that recovers heat of exhaust gas discharged from a gas turbine to generate steam and an assembly method thereof.

An example of the exhaust heat recovery boiler as described above is described in Patent Document 1.
This exhaust heat recovery boiler includes a casing that allows exhaust gas to flow in the horizontal direction, and a heat transfer tube panel block in which a plurality of heat transfer tube panels including a plurality of heat transfer tubes and upper and lower headers of these heat transfer tubes are stacked. .

  This heat transfer tube panel block is connected and fixed to a ceiling constituent block fitted and fixed to a ceiling opening formed in the ceiling wall of the casing via a suspension fitting, and a floor constituent block formed on the floor wall of the casing It is connected and fixed to it via a seismic support.

  When assembling this waste heat recovery boiler, first assemble the casing on the foundation at the boiler installation site, manufacture the heat transfer tube panel block at the factory, and connect the ceiling component block and the floor component block to this heat transfer tube panel block, respectively Fix it. At this time, the connection between the upper connecting pipe fixed in the penetrating state to the ceiling constituent block and the upper header of the heat transfer tube panel, and the lower connecting pipe fixed in the penetrating state to the floor constituent block and the lower pipe of the heat transfer tube panel Connect to the group at the same time.

  Next, the heat transfer tube panel block to which the ceiling building block and the floor building block are connected is transported to the boiler installation location, and is inserted from the ceiling opening of the ceiling wall of the casing in a vertically suspended state, and the ceiling building block is fitted into the ceiling opening. At the same time, the floor building block was fitted and fixed to the floor opening of the floor wall of the casing.

WO2005-012791 Publication

  In the above-described exhaust heat recovery boiler, in addition to the operation of connecting and fixing the ceiling component block and the floor component block to the heat transfer tube panel block, the upper connection tube for the upper and lower headers of the heat transfer tube panel, which is a complicated operation, and Since the connection work of the lower connecting pipe is performed in the factory, the workability is improved and the installation work time of the heat transfer tube panel block is shortened as much as the work performed inside the casing at the boiler installation site is reduced. Figured.

  However, in the above exhaust heat recovery boiler, because the floor constituent block is connected and fixed to the heat transfer tube panel block, high positioning accuracy is required between the floor constituent block and the heat transfer tube panel block. As a result, there is a problem that a lot of time must be spent from the connection of the floor component block to the heat transfer tube panel block to the installation of the heat transfer tube panel block on the casing, and this problem can be solved. It has been a conventional problem.

  The present invention has been made by paying attention to the above-described conventional problems, and can reduce troublesome work performed inside the casing at the boiler installation site, and is formed by stacking a plurality of heat transfer tube panels. An object of the present invention is to provide an exhaust heat recovery boiler that can reduce the installation work time when assembling a boiler of a heat transfer tube panel block, and an assembly method thereof.

  A first aspect of the exhaust heat recovery boiler according to the present invention includes a casing that forms a box shape that allows exhaust gas to flow in a horizontal direction, a large number of heat transfer tubes that are arranged in the vertical direction, and upper and lower headers of these heat transfer tubes. The heat transfer tube panel block formed by stacking a plurality of heat transfer tube panels arranged in the direction crossing the flow of the exhaust gas in the casing, and the ceiling opening formed in the ceiling wall of the casing are fitted and fixed to the ceiling. A ceiling constituting block that constitutes a part of the ceiling wall, and a floor constituting block that is fitted and fixed to a floor opening formed in the floor wall of the casing to constitute a part of the floor wall, the ceiling constituting block, The heat transfer tube panel block is connected and fixed to each other, and the floor constituting block and the heat transfer tube panel block are connected to each other through a position adjusting means so that the distance between them can be changed. An upper connecting pipe connected to the header is fixed to the ceiling constituent block in a penetrating state, and a lower connecting pipe connected to the lower header of the heat transfer tube panel is slidably supported by the floor constituent block in a penetrating state. The configuration is as follows.

  In addition, the second aspect of the present invention is to assemble a box-shaped casing that allows exhaust gas to flow in the horizontal direction on the foundation at the installation site of the exhaust heat recovery boiler, A ceiling wall of the casing with respect to a heat transfer tube panel block comprising a plurality of heat transfer tube panels arranged in a direction crossing the flow of the exhaust gas in the casing and having upper and lower headers of these heat transfer tubes The ceiling structural block that is partly fitted and fixed to the ceiling opening formed to be connected and fixed, and is fitted and fixed to the floor opening formed on the floor wall of the casing. A floor constituent block constituting a part is connected via a position adjusting means, and the ceiling structural block and the heat transfer tube panel block to which the floor constituent block is connected are vertically suspended from the casing. After inserting the ceiling constituent block into the ceiling opening and fitting the floor constituent block into the floor opening of the floor wall of the casing, and then inserting the ceiling constituent block into the ceiling opening. The adjusting means slides the lower connecting pipe connected to the lower header of the heat transfer tube panel supported in a penetrating manner to the floor constituting block with respect to the floor constituting block, and The floor constituent block is fixed to the floor opening by adjusting the distance between the floor constituent block fitted to the floor opening and the heat transfer tube panel block.

  In the exhaust heat recovery boiler and its assembling method according to the present invention, a turnbuckle can be used as the position adjusting means for connecting the floor constituent block and the heat transfer tube panel block so that the distance between them can be changed. However, it is not limited to these.

  In the exhaust heat recovery boiler according to the present invention, in addition to the operation of connecting the ceiling component block and the floor component block to the heat transfer tube panel block, the upper connection tube for the upper and lower headers of the heat transfer tube panel, which is a complicated operation Since the work for connecting the lower connecting pipe and the lower connecting pipe is performed at the factory, the workability is improved and the installation time of the heat transfer tube panel block is shortened as much as the work to be performed inside the casing of the boiler is reduced. Is planned.

  In addition, in the above-described exhaust heat recovery boiler, the floor constituent block and the heat transfer tube panel block are connected to each other through the position adjusting means so that the distance between them can be changed, and is connected to the lower header of the heat transfer tube panel. Since the lower connecting pipe is slidably supported by the floor constituent block in a penetrating state, the position of the space between the floor constituent block and the heat transfer tube panel block is adjusted while sliding the lower connecting pipe relative to the floor constituent block. If it is adjusted by means, the alignment of both will be completed, that is, it will not take much time from the connection of the floor building block to the heat transfer tube panel block to the installation of the heat transfer tube panel block to the casing Therefore, the installation work time can be further shortened.

  In the exhaust heat recovery boiler according to the present invention, in addition to being able to reduce the troublesome work performed inside the casing at the boiler installation location, at the time of boiler assembly of the heat transfer tube panel block in which a plurality of heat transfer tube panels are stacked. A very good effect is obtained that the installation work time can be shortened.

It is a section explanatory view showing roughly the exhaust heat recovery boiler by one example of the present invention. It is an expanded sectional explanatory view based on the AA line position of FIG. FIG. 2 is an enlarged perspective explanatory view showing a procedure for installing a heat transfer tube panel block when the exhaust heat recovery boiler of FIG. 1 is assembled.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 show an exhaust heat recovery boiler according to an embodiment of the present invention.
As shown in FIG. 1, the exhaust heat recovery boiler 1 includes a box-shaped casing 2 that allows the exhaust gas discharged from the gas turbine to flow in a horizontal direction from the gas inlet port IN to the gas outlet port OUT. A plurality of heat transfer tube panel blocks 10 for recovering heat from the burner 3 and the exhaust gas are sequentially arranged on the downstream side of the gas introduction port IN inside.

  Since the casing 2 is a large structure, the casing 2 is surrounded by a ceiling wall reinforcing beam, a side wall reinforcing beam, and a floor wall reinforcing beam 6 (not shown) whose ends are connected to each other at an end to ensure strength. The side wall reinforcing beam is installed in a state where it is placed on the column 7 on the foundation E.

  In addition, the exhaust heat recovery boiler 1 improves the heat recovery efficiency inside the casing 2, and in order to reliably shield the heat from the outside, the ceiling wall 2 </ b> C, the floor wall 2 </ b> F, and the side wall 2 </ b> W of the casing 2 The heat insulating material 8 and the inner paste 9 are constructed. The ceiling wall 2C, the floor wall 2F, and the side wall 2W are made of, for example, a rolled steel plate SS400, while the inner paste 9 is made of, for example, a stainless steel plate.

  As shown in FIG. 2, the heat transfer tube panel block 10 includes a large number of heat transfer tubes 11 arranged in the vertical direction and upper and lower headers 12 and 13 of the heat transfer tubes 11 so as to cross the flow of the exhaust gas. A plurality of heat transfer tube panels 14 arranged in the direction are stacked.

  The plurality of heat transfer tube panel blocks 10 are arranged side by side with each other, and all of them are fitted into a ceiling opening 2a formed in the ceiling wall 2C of the casing 2 and constitute a part of the ceiling wall 2C. It is fixed to 15 integrally through a hanging metal fitting 16. An upper connecting pipe 17 connected to the upper header 12 of the heat transfer tube panel 14 of the heat transfer tube panel block 10 is fixed to the ceiling constituting block 15 in a penetrating state.

  Further, the heat transfer tube panel block 10 is connected to a floor constituting block 18 which is fitted in a floor opening 2b formed in the floor wall 2F of the casing 2 and constitutes a part of the floor wall 2F via a connector 19. In addition, a lower connecting pipe 20 connected to the lower header 13 of the heat transfer tube panel 14 of the heat transfer tube panel block 10 is slidably supported on the floor constituting block 18 in a penetrating state.

  In this case, a turnbuckle 21 as a position adjusting means for changing the distance between the heat transfer tube panel block 10 and the floor constituting block 18 is disposed in the intermediate portion of the connector 19.

  As shown in FIG. 3, the heat transfer tube panel block 10 to which the ceiling building block 15 and the floor building block 18 are connected is vertically suspended from the ceiling opening 2a of the ceiling wall 2C as shown in FIG. The ceiling constituting block 15 is fitted and fixed to the ceiling opening 2a, and the floor constituting block 18 is fitted to the floor opening 2b of the floor wall 2F. The mutual alignment is performed by adjusting the distance between the floor constituent block 18 and the heat transfer tube panel block 10 while sliding the connecting pipe 20 with respect to the floor constituent block 18. In addition, the code | symbol 22 in FIG. 2 is a seal ring, and has prevented the waste gas leakage from between the floor component block 18 and the lower connection pipe 20. FIG.

  Next, a method for assembling the above-described exhaust heat recovery boiler 1 will be described. First, the casing 2 is assembled on the foundation E at the boiler installation location. On the other hand, in the factory, the ceiling constituent block 15 is connected and fixed to the heat transfer pipe panel block 10 formed by stacking a plurality of layers of the heat transfer pipe panels 14, and the floor constituent block 18 is connected via the turnbuckle 21.

  Next, the heat transfer tube panel block 10 to which the ceiling constituent block 15 and the floor constituent block 18 are connected is conveyed to the boiler installation location.

  At this time, since the heat transfer tube panel 14 is a structure that is easily deformed, it is necessary to fix the heat transfer tube panel block 10 in a state in which a plurality of layers of the heat transfer tube panel 14 are stacked to a rectangular tube-shaped transfer box at the time of transfer. . Usually, the heat transfer tube panel block 10 is fixed to the transport box through a steel frame (skid) framed to cover the heat transfer tube panel block 10, but in this embodiment, the ceiling component block 15 and the floor configuration connected to the heat transfer tube panel block 10 are used. The heat transfer tube panel block 10 in the transport box is fixed to the transport box by fitting the blocks 18 to both ends of the transport box.

  That is, simplification of the packing and unpacking work and reduction of the conveyance cost can be realized as much as the steel frame is not used. In addition, it is desirable to bolt with multiple positions of the heat exchanger tube panel block 10 accommodated in the transport box so that the position of the heat transfer tube panel block 10 can be adjusted.

  Next, in the boiler installation place, the heat transfer tube panel block 10 to which the ceiling building block 15 and the floor building block 18 are connected is vertically suspended, and is inserted from the ceiling opening 2a of the ceiling wall 2C of the casing 2 in this vertically suspended state. The ceiling constituting block 15 is fitted and fixed to the ceiling opening 2 a and the floor constituting block 18 is fitted to the floor opening 2 b of the floor wall 2 F of the casing 2.

  In this state, the turnbuckle 21 is operated to slide the lower connecting pipe 20 supported by the floor constituent block 18 in a penetrating manner with respect to the floor constituent block 18 while the floor constituent block 18 and the heat transfer tube panel are slid. After adjusting the spacing with the block 10, the floor component block 18 is fixed to the floor opening 2b, so that the installation of the ceiling component block 15 and the heat transfer tube panel block 10 to which the floor component block 18 is connected to the casing 2 is completed. .

  In the exhaust heat recovery boiler 1 according to this embodiment, in addition to the operation of connecting the ceiling component block 15 and the floor component block 18 to the heat transfer tube panel block 10, the upper and lower tubes of the heat transfer tube panel 14, which are complicated operations, are performed. Since the connecting work of the upper connecting pipe 17 and the lower connecting pipe 20 to the gathers 12 and 13 is performed at the factory, the workability is improved and the work is reduced by the amount of work performed inside the casing 2 at the boiler installation site. This shortens the installation work time of the heat transfer tube panel block.

  In addition, in the exhaust heat recovery boiler 1 according to this embodiment, the floor constituting block 18 and the heat transfer tube panel block 10 are connected to each other via the turnbuckle 21 so that the interval between them can be changed, and the lower pipe of the heat transfer tube panel 14 is moved. Since the lower connecting pipe 20 connected to the floor 13 is supported by the floor constituting block 18 so as to be slidable, the turnbuckle 21 is operated to slide the lower connecting pipe 20 relative to the floor constituting block 18. However, if the space | interval of the floor structure block 18 and the heat exchanger tube panel block 10 is adjusted, both alignment will be completed.

  That is, it is not necessary to spend a lot of time from the connection of the floor component block 18 to the heat transfer tube panel block 10 to the installation of the heat transfer tube panel block 10 to the casing 2, and the installation work time can be further reduced by that much. Will be illustrated.

  The configurations of the exhaust heat recovery boiler and the assembly method thereof according to the present invention are not limited to the above-described embodiments.

DESCRIPTION OF SYMBOLS 1 Waste heat recovery boiler 2 Casing 2C Ceiling wall 2F Floor wall 2a Ceiling opening 2b Floor opening 10 Heat-transfer tube panel block 11 Heat-transfer tube 12 Upper header 13 Lower header 14 Heat-transfer tube panel 15 Ceiling component block 17 Upper connection tube 18 Floor configuration Block 20 Lower connecting pipe 21 Turn buckle (Position adjusting means)

Claims (2)

A box-shaped casing for flowing exhaust gas horizontally;
A plurality of heat transfer tubes arranged in the vertical direction and upper and lower headers of these heat transfer tubes, and a plurality of layers of heat transfer tube panels arranged in a direction crossing the flow of the exhaust gas in the casing. A panel block,
A ceiling constituting block which is fitted and fixed to a ceiling opening formed in the ceiling wall of the casing to constitute a part of the ceiling wall;
A floor constituting block that is fitted and fixed to a floor opening formed in the floor wall of the casing to constitute a part of the floor wall;
The ceiling component block and the heat transfer tube panel block are connected and fixed to each other.
The floor constituting block and the heat transfer tube panel block are connected to each other through a position adjusting means so as to be able to change a mutual interval,
An upper connecting pipe connected to the upper header of the heat transfer tube panel is fixed in a penetrating manner to the ceiling constituent block,
The lower connection pipe connected to the lower header of the heat transfer tube panel is an exhaust heat recovery boiler that is slidably supported by the floor constituent block in a penetrating state. While assembling a box-shaped casing that allows exhaust gas to flow in the horizontal direction on the foundation at the installation site of the exhaust heat recovery boiler, it has a large number of heat transfer tubes arranged in the vertical direction and upper and lower headers of these heat transfer tubes Then, a heat transfer tube panel block formed by stacking a plurality of heat transfer tube panels arranged in a direction crossing the flow of the exhaust gas in the casing is fitted and fixed to a ceiling opening formed in the ceiling wall of the casing. The ceiling constituent blocks constituting a part of the ceiling wall are connected and fixed, and the floor constituent blocks constituting the part of the floor wall are adjusted by being fitted and fixed to a floor opening formed in the floor wall of the casing. Connected through means,
The heat transfer tube panel block to which the ceiling constituent block and the floor constituent block are connected is inserted from the ceiling opening of the ceiling wall of the casing in a vertically suspended state, and the ceiling constituent block is fitted and fixed to the ceiling opening. And after fitting the floor building block to the floor opening of the floor wall of the casing,
The floor of the casing is slid while the lower connecting pipe connected to the lower header of the heat transfer tube panel supported by the floor constituent block in a penetrating state with respect to the floor constituent block is moved by the position adjusting means. A method for assembling an exhaust heat recovery boiler for adjusting a distance between the floor constituent block fitted to the floor opening of a wall and the heat transfer tube panel block and fixing the floor constituent block to the floor opening.

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