JP3659714B2 - High temperature gas pipe inner liner mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a liner for protecting a heat insulating material stretched inside a high-temperature gas pipe, such as supplying a high-temperature gas from a boiler to a gas turbine in a combined power plant including a pressurized fluidized bed boiler and a gas turbine. The present invention relates to a high-temperature gas pipe inner liner mounting device for mounting.
[0002]
[Prior art]
In recent thermal power plants, various types of combined power generation facilities have been constructed in order to increase the efficiency of the plant, and in particular, the aim was to diversify the types of coal-fired boilers and increase the efficiency. Many combined power plants with pressurized fluidized bed boilers and gas turbines driven by the exhaust gas have been built in recent years.
[0003]
In such a combined power plant, piping for supplying high-temperature gas from a pressurized fluidized bed boiler to a gas turbine is, for example, compared to high-temperature gas piping used in various industrial plans such as steelworks and chemical plants, It is necessary to use a pressure tube that is used under a considerably high pressure condition, and since it is used under a high temperature condition (800 to 900 ° C.), the pressure tube is configured only with a metal material. In such a case, it is necessary to manufacture a thick pressure-resistant pipe made of such an expensive heat-resistant alloy that can withstand high temperatures and high pressures, which is expensive and increases plant construction costs.
[0004]
Therefore, by designing the heat-insulating material on the inner surface of the pressure tube, the temperature rise of the pressure tube is suppressed and the strength of the pressure tube is ensured under low temperature conditions (~ 400 ° C). Means have been adopted in which the material is made of an inexpensive material such as carbon steel or low alloy steel that is usually used to reduce plant construction costs.
[0005]
However, in high-temperature gas pipes with insulation material applied to the inner surface of pressure tubes made of such inexpensive materials, the insulation material applied to the inner surface may be scattered or dropped if exposed to high-temperature, high-speed gas flow. In the unlikely event that the insulation material scatters or drops off and the pressure tube is directly exposed to high-temperature gas, the pressure tube components are not normally usable under high temperature conditions. Therefore, there is a risk that the gas is damaged in a short period of time and the hot gas is ejected to the periphery thereof.
[0006]
In order to prevent such a worst case from occurring, a liner is provided on the gas contact surface of the heat insulating material which is constructed on the inner surface of the pressure tube and prevents the pressure tube from being directly exposed to the high temperature gas. Thus, the gas contact surface of the heat insulating material is protected from the high-temperature gas flow, and the heat insulating material is prevented from scattering and dropping off.
9 to 11 are used in a pipe for supplying a high-temperature gas from a conventional pressurized fluidized bed boiler to a gas turbine, and the liner 1 is attached to the inner surface of the heat insulating material 7 so as to prevent the heat insulating material from scattering and dropping off. It is a figure which shows the high temperature gas pipe internal liner attachment apparatus for this.
[0007]
As shown in the figure, the gas contact surface 8 on the inner peripheral side of the heat insulating material 7 which is constructed on the inner surface of the pressure tube 3 and suppresses the temperature rise of the pressure tube 3 is covered with the liner 1.
The liner 1 is made of a cylindrical body that is divided in the axial direction into a length shorter than the outer diameter D (see FIG. 14) of the pressure-resistant tube 3, and both end portions thereof are fitted on the inner peripheral surface of the heat insulating material 7. 1 is inserted into the inner peripheral surface of the strip-shaped split ring 2 disposed on the inner surface of the heat insulating material 7 at a pitch of a length capable of absorbing the thermal expansion in the axial direction of the liner 1 caused by the high-temperature gas flowing inside the Only one end of the portion is fixed to the inner peripheral surface of the split ring 2 by fillet welding 9.
[0008]
As a result, even if an axial thermal expansion difference δ _x occurs between the liner 1 and the pressure tube 3 due to the high-temperature gas flowing inside the liner 1, both ends are inserted into the inner peripheral surface of the split ring 2. , the liner 1 is disposed on the inner peripheral surface of the heat insulating material 7, one end of which is not welded it is by sliding inside the split ring 2, so as to absorb the thermal expansion difference [delta] _x .
[0009]
In addition, one end of the liner 1 is fixed to the inner peripheral surface so that the liner 1 that is divided in the axial direction and covers the exhaust gas surface 8 of the heat insulating material 7 is not vibrated by a high-temperature, high-speed gas flow. Each of the split rings 2 with the other end inserted is fixed to the outer peripheral surface by fillet welding, and the other end faces the inner surface of the pressure-resistant tube 3, and the tube shaft is radiated from the outer peripheral surface of the split ring 2. It is fixed to the pressure-resistant tube 3 by a plurality of (six in the figure) leaf spring supports 4 that are similarly inclined and extended to the inner peripheral surface of the pressure-resistant tube 3 by the fillet welding.
[0010]
Thus, as described above, the radial thermal expansion difference δ generated between the pressure ring 3 and the split ring 2 and the liner 1 that absorb the axial thermal expansion of the liner 1 by the sliding of the liner 1 on the inner peripheral surface. _R can be absorbed by the radial deflection of the leaf spring support 4 as shown in FIG.
[0011]
Further, as an assembly procedure for attaching the liner 1 to the inside of the pressure resistant tube 3 in the above-described prior art high-temperature gas pipe inner liner attaching device, first, as shown in FIG. the parts, keep attached by weld 12 corners on the outer peripheral surface of the split ring 2.
Next, as shown in FIG. 14, the assembly of the leaf spring support 4 and the split ring 2 is inserted and arranged at a predetermined position inside the pressure resistant tube 3 so that the split ring 2 and the pressure resistant tube 3 are on the same axis. After attaching the outer peripheral end of the leaf spring support 4 to the inner peripheral surface of the pressure tube 3 by fillet welding 12 , the heat insulating material 7 is placed between the inner surface of the pressure tube 3 and the outer surface of the split ring 3. Tension and construction.
[0012]
Next, as shown in FIG. 15, both end portions of the liner 1 are inserted into the inner peripheral surface of the adjacent split ring 2, and only one end portion of the liner 1 is fillet welded on the inner peripheral surface of the split ring 2. And install.
In this way, the liner 1 divided in the axial direction is sequentially inserted and attached in this procedure, and finally, the exhaust gas surface of the heat insulating material 7 inside the high-temperature gas pipe shown in FIG. The high-temperature gas pipe 10 in which the heat insulating material 7 is prevented from scattering and dropping off is completed . The liner 1 is attached to the inside of the pressure-resistant pipe 3 of the high-temperature gas pipe 10 according to the above-described conventional technique. The device has the following problems.
[0013]
First, the radial thermal expansion difference δ _R between the liner 1 (and the split ring 2) and the pressure tube 3 can be absorbed by the deflection of the leaf spring support 4 as shown in FIG. At this time, stress due to the bending moment M is generated at the fillet welds to the outer peripheral surface of the split ring 2 at both ends of the leaf spring support 4 and the inner peripheral surface of the pressure-resistant tube 3.
[0014]
Among these, regarding the bending moment M generated in the fillet welded portion to the inner peripheral surface of the relatively low temperature pressure-resistant tube 3, even if a slightly higher stress is generated by this moment M, there is a particular problem in terms of material strength. However, the stress generated by the bending moment M of the fillet weld on the outer peripheral surface of the high-temperature split ring 2 is high even if it is a low stress value. Since the material strength (creep and fatigue strength) of the part can hardly be expected, it may cause damage.
[0015]
That is, the split ring 2 cannot be fixed at a predetermined position of the pressure-resistant tube 3, the liner 1 moves in the axial direction, and there is a possibility that the gas contact surface of the heat insulating material 7 is scattered and dropped off. Will start to vibrate.
The plate bahoe support 4 is attached to the outer peripheral surface of the high-temperature split ring 2 by fillet welding. Since the stress concentration is high, the structure is more susceptible to fatigue damage.
[0016]
The split ring 2 is positioned in the axial direction so that a gap (> δ _x ) for the axial slide that expands and contracts by the high-temperature gas is secured between the adjacent liners 1, and is arranged on the inner surface of the pressure tube 3. For this purpose, an assembly with the outer diameter L of the leaf spring support 4 and the split ring 2 shown in FIG. 13 is inserted into the pressure tube 3 with the inner diameter D as shown in FIG. In this case, the assembled product cannot be inserted into the pressure tube 3 unless the dimension L between the outer diameter ends of the opposed leaf spring supports 4 is made smaller than the inner diameter D of the pressure tube 3. Is self-explanatory.
For this reason, if the dimension between the outer diameter ends of the leaf spring support 4 is made smaller than the inner diameter D of the pressure resistant tube 3 and the assembly is inserted into the pressure resistant tube 3 and attached, When fillet-welding the end of the radial side to the inner surface of the pressure-resistant tube 3, it is necessary to perform welding work with a gap between them, so that the split ring 2 and the pressure-resistant tube 3 are on the same axis. In spite of the necessity of accurate mounting, there is a problem that workability is deteriorated.
[0017]
[Problems to be solved by the invention]
The present invention eliminates the problems of the conventional high-temperature gas pipe inner liner mounting apparatus described above, and particularly the outer peripheral surface of the split ring 2 of the leaf spring support 4 for mounting the split ring 2 to the inner surface of the pressure-resistant pipe 3. The bending moment generated in the mounting portion is reduced, the concentrated stress generated in the mounting portion is reduced, the fatigue damage of this portion is eliminated, and the split ring 2 is attached to the inside of the pressure-resistant pipe 3 during the mounting. The workability of attaching the outer diameter end of the leaf spring support 4 to the inner surface of the pressure tube 3 is improved, and the split ring 2 and the pressure tube 3 can be mounted concentrically, accurately and easily. It is an object of the present invention to provide a gas pipe internal liner mounting device.
[0018]
[Means for Solving the Problems]
For this reason, the high-temperature gas pipe inner liner mounting device of the present invention is the following means.
[0019]
(1) A cylindrical liner that is installed in the gas contact surface of a heat insulating material that is divided in the axial direction and that is installed on the inner surface of the pressure-resistant pipe that transfers high-temperature gas, and is installed at both axial ends of the liner, A split ring for fixing one end of both ends of the inserted liner, and a leaf spring support that is disposed between the split ring and the inner surface of the pressure-resistant tube so as to be inclined and connected with each other. In the gas pipe inner liner mounting apparatus, a mounting seat that forms a seating surface parallel to the axial direction and is fixed to the inner surface of the pressure-resistant pipe, one end is butt welded and fixed to one end of the split ring, and the other end is A bolt mounting portion having a surface parallel to the seating surface is provided, and the leaf spring support for fixing the split ring to the inside of the pressure tube is provided, and one end is fixed to the split ring, Bolt removal when installing The gist is that the radius of the attaching portion is the leaf spring support shortened by substantially the difference in thermal expansion in the radial direction between the pressure-resistant tube and the split ring when the high-temperature gas passes .
[0020]
As described above, the high-temperature gas pipe inner liner mounting device according to the present invention has a mounting seat seat mounted on the inner surface of the pressure tube, with the inner end of the leaf spring support butted against the end of the strip-shaped split ring. Adjoining the outer peripheral edge of the leaf spring support to the surface, bolting, and then adhering the inner peripheral surface of the heat insulating material by adopting a structure in which the leaf spring support is mounted on the mounting seat by fillet welding The liner freely slides on the inner peripheral surface of the split ring, and the axial thermal expansion difference δ _x generated between the pressure resistant tube and the pressure resistant tube as in the conventional apparatus is absorbed, and the pressure resistance of the liner and the split ring is also absorbed. The radial thermal expansion difference δ _R generated between the pipe and the tube is absorbed by the radial deflection of the leaf spring support, and the high-temperature gas flow flowing therethrough does not cause vibration in the liner.
[0021]
Further, when the leaf spring support is bent, the bending moment generated in the split ring of the leaf spring support and the attachment portion to the pressure tube can be remarkably reduced.
Thereby, the fatigue damage which has generate | occur | produced especially in the attaching part to the split ring of a leaf | plate spring support can be eliminated.
Further, the concentric mounting of the split ring inside the pressure-resistant pipe is accurate and easy, and the mounting workability is improved .
[0022]
In this way, the leaf spring support is manufactured with an outer diameter that is as short as the radial thermal expansion difference between the pressure tube and the liner (split ring). When the split ring is mounted inside the pressure tube, it is attached to the seating surface of the mounting seat. , By pulling the bolt mounting part of the leaf spring support by tightening the bolt, and making it fit, the split ring and the leaf spring support are assembled in advance, and when it is installed inside the pressure tube, it is inserted into the pressure tube In addition to the ease of tightening the bolts, the split ring can be accurately attached to the inside of the pressure tube with the pressure tube aligned with the shaft center, which facilitates the work.
[0023]
In addition, when high-temperature gas passes through the inside, the stress generated in the leaf spring support is combined with the mounting structure with the split ring at the inner diameter end of the leaf spring support and the mounting structure with the bolt mounting seat. As a result, it can be almost zero, eliminating the risk of damage from creep.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a high-temperature gas pipe inner liner mounting device of the present invention will be described with reference to the drawings.
1 is a longitudinal sectional view showing a first embodiment of an apparatus for attaching an inner liner of a high-temperature gas pipe according to the present invention, FIG. 2 is a sectional side view taken along the line AA shown in FIG. 1, and FIG. It is an enlarged view of the A section shown.
In the drawings showing the embodiment of the present invention, the same members as those of the conventional high-temperature gas pipe inner liner mounting apparatus shown in FIGS. .
[0025]
As shown in these drawings, a mounting seat 11 projects from the inner peripheral surface of the pressure-resistant tube 3.
A seat surface 12 that is parallel to the axial direction is provided on the inner surface of the mounting seat 11, and a bolt mounting portion 42 provided at an outer diameter end portion of the leaf spring support 4 described later is provided on the seat surface 12. It is made to adhere along with the bolt 13 along.
[0026]
A heat insulating material 7 is stretched on the inner surface of the pressure-resistant tube 3, and an axially divided liner 1 is stretched on the gas contact surface 8 on the inner peripheral surface of the heat insulating material 7.
Both ends of the dividing portion of the liner 1 are disposed in the axial direction at a pitch slightly longer than the length obtained by adding the axial thermal expansion difference δ _x between the pressure tube 3 and the liner 1 to the axial length of the liner 1. 3 is inserted into the inner peripheral surface of the belt-shaped split ring 2, and only one end is welded to the inner peripheral surface of the split ring 2 as shown in FIG. Has been.
Therefore, the other end portion not fixed to the inner peripheral surface of the split ring 2 can slide in the axial direction on the inner peripheral surface of the split ring 2, and can absorb the thermal elongation in the axial direction of the liner 1.
[0027]
Further, at one end of the split ring 2, an end face of the inner diameter end portion 41 of the leaf spring support 4 that is parallel to the axial direction is as shown in FIG. It is fixed by butt welding.
Similar to the inner diameter end portion 41, the outer diameter end portion of the leaf spring support 4 is provided with a bolt mounting portion 42 that is parallel to the axial direction, and the bolt mounting portion 42 is mounted as described above. After being fixed to the seat surface 12 of the seat 11 with the bolt 13, the end surface is welded and fixed to the seat surface 12 as shown in FIG.
[0028]
In this way, the inner diameter end portion 41 is fixed to one end of the split ring 2 by butt welding, and the bolt mounting portion 42 of the outer diameter end portion is fixed to the seat surface 12 and is expanded by being inclined from the axial direction. The split ring 2 is fixed to a predetermined position inside the pressure-resistant tube 3 by the leaf spring support 4 so that the liner 1 is stretched on the gas contact surface 8 of the heat insulating material 7.
[0029]
As a procedure for assembling the liner 1 into the pressure tube 3 by the high-temperature gas pipe inner liner mounting device of the present embodiment described above, first, as shown in FIG. Butt welding is attached to the end of the split ring 2.
Here, the leaf spring support 4 is manufactured by a short dimension h-[delta] _R radial thermal expansion difference [delta] _R of the pressure-resistant pipe 3 and the liner 1 relative to the mounting dimension h.
[0030]
Next, as shown in FIGS. 6 and 7, the mounting seat 11 is attached to a predetermined position on the inner surface of the pressure-resistant tube 3 by fillet welding, and the assembly of the leaf spring support 4 and the split ring 2 shown in FIG. The bolt mounting portion 42 of the leaf spring support 4 is pulled and fixed to the seat surface 12 of the mounting seat 11 by tightening the bolt 13.
And after attaching the attachment part 42 of the leaf | plate spring support 4 to the seat surface 12 of the attachment seat 11 with the attachment dimension h, the end surface of the attachment part 42 is fillet-welded to the seat surface 12, and it attaches after that, and a pressure-resistant pipe | tube A heat insulating material 7 is applied to the inner surface of 3.
[0031]
Next, as shown in FIG. 8, both end portions of the liner 1 are inserted into the inner peripheral surface of the split ring 2, and only one end portion of the liner 1 is fillet welded to the inner peripheral surface of the split ring 2. In this way, the liner 1 divided into a length shorter than the diameter of the pressure tube 3 in the axial direction is sequentially inserted and attached in this procedure, so that the internal liner structure of the hot gas pipe 10 shown in FIG. The pressure ring 3 is completed inside, but the split ring 2 is axially positioned and attached so that a gap (> δ _x ) for the axial slide is secured between the adjacent liners 1. It has been.
[0032]
By adopting the above-described high-temperature gas pipe inner liner mounting device according to the embodiment of the present invention, the axial thermal expansion difference δ _x between the liner 1 and the pressure-resistant pipe 3 is equal to the liner 1 as in the prior art. The radial thermal expansion difference δ _R between the liner 1 and the pressure tube 3 can be absorbed by the slide inside the divided ring 2 radially from the divided ring 2 toward the inner surface of the pressure tube 3. The vibration of the liner 1 caused by the passage of the high-temperature gas inside can be absorbed by the deflection of the plurality of leaf spring supports 4 extending obliquely with respect to the pressure tube 3 of the split ring 2 by the leaf spring support. Can be stopped by sticking.
[0033]
Furthermore, in the embodiment of the present invention, the leaf spring support 4 is manufactured with a dimension that is short by the radial thermal expansion difference between the pressure tube 3 and the liner 1, and the leaf spring support 4 is mounted on the seat surface 12 of the mounting seat 11 with the bolt 13. By attaching by tightening, the stress at high temperature approaches zero, and there is no risk of damage due to creep.
Further, the attachment of the leaf spring support 4 on the high-temperature split ring 2 side is by butt welding, and the stress concentration is reduced as compared with the case of the fillet welding of the prior art, and fatigue damage is less likely to occur.
[0034]
Furthermore, the assembly of the plate spring support 4 and the split ring 2, when inserted into the pressure-resistant tube 3, have made the total number of the plurality of leaf springs support 4 is in the fabrication dimension h-[delta] _R, relative at that time Since the dimension L ′ between the outer diameters of the leaf spring supports is smaller than the dimension D ′ between the seating surfaces 12 of the mounting seat 11 facing each other, the insertion becomes easy. Also, the total number of fabrication dimension h-[delta] _R of the leaf spring support 4, by previously uniformly fabricated, by performing tightening of bolts 13 evenly, automatically and split ring 2 and the breakdown voltage tube 3 are the same The workability for mounting on the inside of the pressure tube 3 with the split ring 2 being coaxial with the pressure tube 3 is improved.
[0035]
In short, the above-described embodiment has the following configurations (1) to (3).
(1) A mounting seat that is parallel to the axial direction of the pressure tube and has a seat surface to which the outer diameter end of the leaf spring support is mounted is fixed to the inner surface of the pressure tube. The number of leaf spring supports provided in the circumferential direction at the positions where the outer diameter end portions of the leaf spring supports that are expanded from the split ring while being inclined with respect to the shaft center are fixed to the inner surface of the pressure tube. I only provided it.
[0036]
(2) The inner diameter end, which is one end, is fixed coaxially to one end of the split ring so as to reduce the bending moment generated when the split ring (liner) is thermally expanded and contracted in the radial direction, and is inclined with respect to the axis. The outer diameter end of the other end that has been expanded is made into a bolt mounting portion that is parallel to the seating surface of the mounting seat, and the split ring is concentrically fixed and supported inside the pressure tube. A leaf spring support was provided.
[0037]
(3) When the split ring is fixed inside the pressure tube and one end of the supporting leaf spring support is fixed to one end of the split ring, it is provided at the other end of the flat spring support and is parallel to the axial direction. The outer diameter of the bolt mounting portion thus made is made shorter than the inner diameter of the pressure-resistant tube by substantially the difference in thermal expansion between the pressure-resistant tube and the split ring generated when the high-temperature gas passes.
[0038]
【The invention's effect】
According to the high-temperature gas pipe inner liner mounting device of the present invention, the structure shown in the claims can surely prevent the leaf spring support from being damaged and can improve the workability of assembly.
Thus, in combined cycle power generation plan bets with pressurized fluidized bed boiler and a gas turbine, the hot gas pipe for supplying hot gases from the boiler to the gas turbine, it is possible to contribute to improving reliability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a hot gas pipe inner liner mounting device according to the present invention,
FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.
FIG. 3 is an enlarged view of a portion A shown in FIG.
4 is a view showing details of the welded portion of FIG. 3, FIG. 4 (a) is a detailed view of B portion of FIG. 3, FIG. 4 (b) is a detailed view of C portion of FIG. 3, and FIG. Part D detail view of FIG.
FIG. 5 is a longitudinal sectional view of an assembly of a split ring and a leaf spring support;
6 is a longitudinal sectional view showing the split ring and leaf spring support assembly shown in FIG. 5 inserted into the pressure tube.
FIG. 7 is a detailed view of a portion E in FIG.
FIG. 8 is a longitudinal sectional view showing a liner stretched on the inner peripheral surface of the heat insulating material;
FIG. 9 is a longitudinal sectional view showing the internal structure of a conventional hot gas pipe;
10 is a cross-sectional view taken along the arrow BB shown in FIG.
11 is an enlarged view showing an F portion of FIG. 9, FIG. 11 (a) is an overall view of the F portion, FIG. 11 (b) is a detailed view of a G portion of FIG. 11 (a), and FIG. 11 (a) H section detail view,
FIG. 12 is a view showing the behavior of a leaf spring support when a difference in thermal expansion occurs between the pressure tube and the liner (split ring);
FIG. 13 is a longitudinal sectional view of an assembly of a conventional split ring and leaf spring support;
14 is a longitudinal sectional view showing when the assembly shown in FIG. 13 is inserted into the pressure tube.
FIG. 15 is a longitudinal sectional view showing a state where a liner is stretched on the inner peripheral surface of a conventional heat insulating material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liner 2 Split ring 3 Pressure-resistant pipe 4 Leaf spring support 41 Leaf spring support internal diameter end part 42 Leaf spring support bolt mounting part 7 Heat insulating material 8 Gas contact surface 9 Fillet weld part 10 Hot gas piping 11 Mounting seat 12 Seat surface 13 Bolt

Claims (1)

Cylindrical liners installed on the gas contact surface of the heat insulating material divided into the axial direction and applied to the inner surface of the pressure-resistant pipe that transfers high-temperature gas, installed at both axial ends of the liner, and inserted into the inner peripheral surface The inside of the high-temperature gas pipe which consists of the split ring which fixes one end part of the both ends of the said liner, and the leaf | plate spring support which is inclined and arrange | positioned and connected between the said split ring and the said pressure | voltage resistant inner surface. In the liner mounting device, a mounting seat that forms a seat surface parallel to the axial direction and is fixed to the inner surface of the pressure-resistant tube, one end portion is butt welded and fixed to one end of the split ring, and the other end portion is connected to the seat surface. is the bolt mounting portion having parallel faces, Rutotomoni provided with the leaf spring support for securing said split ring inside the pressure-resistant tube, secured at one end portion to the split ring, when mounted inside the pressure-resistant tube Of the bolt mounting part Diameter, high-temperature gas pipe inner liner attachment device, characterized in that the said leaf spring support which is substantially only the thermal expansion difference shorter in the radial direction of the high temperature gas the pressure-resistant tube at the time of passing between the split ring.

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