JP3659715B2 - Internal liner for T-type or L-type hot gas piping - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal liner for piping through which hot gas flows, and more particularly to an internal liner for T-shaped tubes or L-shaped tubes in high-temperature gas piping.
[0002]
[Prior art]
In recent years, various types of combined power generation facilities have been constructed in order to achieve high efficiency in thermal power plants. Among them, pressurized fluidized bed boilers aiming at diversification and high efficiency of coal-fired boilers and their Many combined power generation facilities with gas turbines driven by exhaust gas have been built in recent years.
[0003]
Pipes that supply high-temperature gas from a pressurized fluidized bed boiler to a gas turbine are used under considerably high pressure conditions compared to high-temperature gas pipes that constitute various conventional industrial plants (such as steelworks and chemical plants). In addition, because it is used under high temperature conditions (800 to 900 ° C.), if the pressure tube is made of only a metal material, it is necessary to manufacture a thick pressure tube with an expensive heat-resistant alloy. Therefore, the plant construction cost will be increased.
[0004]
Therefore, the pressure tube is usually designed by suppressing the temperature rise of the pressure tube by constructing a heat insulating material on the inner surface of the pressure tube and ensuring the strength of the pressure tube under low temperature conditions (~ 400 ° C). Means of manufacturing with inexpensive materials such as commonly used carbon steel and low alloy steel are employed.
[0005]
Here, in high-temperature gas pipes where insulation is applied to the inner surface of the pressure tube, there is a risk of scattering if the heat-insulation material is exposed to the gas flow. If the heat-insulation material falls off, the pressure tube is directly exposed to the high-temperature gas. In such a case, since the pressure tube construction material is placed under a high temperature condition that cannot normally be used, it is damaged within a short period of time, and there is a risk that the high temperature gas is ejected to the periphery. On the other hand, a liner is provided to protect the gas contact surface of the heat insulating material from the gas flow.
[0006]
The present inventors have proposed a liner as shown in FIGS. 5 and 6 in order to protect the gas contact surface of the heat insulating material applied to the inner surface of such a pressure tube from the gas flow. 5 and 6, reference numeral 3 denotes a pressure-resistant pipe, and a heat insulating material 7 is applied to the inner surface thereof, and a liner 1 that protects the gas contact surface of the heat insulating material 7 from a gas flow is lined.
[0007]
The liner 1 is divided in the axial direction, and both end portions thereof are inserted into the inner diameter of the strip-shaped mounting bracket 2 and one end portion is fillet welded. As a result, the difference in axial thermal expansion δ _X between the liner 1 and the pressure tube 3 can be absorbed by sliding on the mounting bracket 2 part.
[0008]
The divided liners 1 are a plurality of (six in the figure) leaf spring supports 4 extending radially from the respective mounting brackets 2 toward the inner surface of the pressure-resistant tube 3 so as not to vibrate due to the gas flow. The leaf spring support 4 is fixed by butt welding to the end of the belt-like mounting bracket 2.
[0009]
On the other hand, a mounting seat 5 is fillet welded to the inner surface of the pressure-resistant tube 3, and the fillet welding support is mounted after the leaf spring support 4 is fixed along the seating surface of the mounting seat 5 with the bolt 6. As a result, the radial thermal expansion difference between the liner 1 and the pressure tube 3 can be absorbed by the deflection of the leaf spring support 4.
[0010]
[Problems to be solved by the invention]
The liner shown in FIG. 5 described above is excellent as an internal liner for a straight straight high-temperature gas pipe, and the thermal expansion difference δ ′ _X between the leaf spring support 4 and the pressure tube 3 and the thermal expansion between the liner 1 and the pressure tube 3. Even if there is a difference δ _X , the liner 1 moves in the axial direction over the entire length.
[0011]
On the other hand, in a T-shaped tube for branching and joining or an L-shaped tube for bending, it is necessary to allow the nozzle to slide smoothly in the axial direction of the branch pipe without moving in the axial direction of the main pipe. Yes, the straight liner internal liner structure cannot be applied as it is.
[0012]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liner for a high-temperature gas pipe that does not cause problems associated with thermal expansion due to a high-temperature gas flow in a T-shaped tube or an L-shaped tube provided with a heat insulating material and a liner on the inside.
[0013]
[Means for Solving the Problems]
The present invention relates to a liner for protecting a gas contact surface of a heat insulating material installed on the inner surface of a pressure tube from a gas flow, a leaf spring support for holding the liner on an outer pressure tube, and the leaf spring. An internal liner having the following structure is provided in order to solve the above-described problems with respect to an internal liner for a T-shaped tube or an L-shaped tube in a high-temperature gas pipe having a belt-like mounting bracket for mounting the liner on a support.
[0014]
That is, in the inner liner for the T-shaped tube or the L-shaped tube according to the present invention, the belt-like mounting bracket is attached to the liner around the mother tube axis at the intersection of the branch tube shaft and the mother tube shaft of the T-shaped tube or L-shaped tube. mounting Rutotomoni, attach the mounting seat to the pressure-resistant inner surface at a position about the substrate tube axis at the intersection of said branch pipe shaft and mother tube axis, withstand the mounting brackets attached to the mounting seat by pantograph Katachiban spring support A structure that is held in a tube is adopted.
[0015]
In the inner liner configured as described above, even if there is a radial thermal expansion difference between the mother tube side liner and the pressure tube in the T-shaped tube or L-shaped tube, the inner liner is arranged around the intersection of the mother tubes. The pantograph shaped leaf spring support is deformed into a pantograph shape to absorb the thermal expansion difference.
[0016]
Also, a pantograph-shaped leaf spring support is disposed around the mother tube axis at the intersection of the branch tube shaft and the mother tube shaft, and the pantograph-shaped leaf spring support has a belt-like mounting bracket at a position around the mother tube axis at the intersection. The mounting position of the pantograph type leaf spring support to the mother pipe side liner and the mounting position of the pantograph type leaf spring support to the pressure pipe are the same in the axial direction of the mother pipe because it is attached to the mounting seat and held by the pressure pipe. Thus, the difference in thermal expansion between the pantograph shaped plate spring support and the pressure tube becomes zero, and the mother tube side liner and the nozzle do not move in the axial direction of the mother tube. As a result, the nozzle can be smoothly displaced in the axial direction of the branch pipe.
[0017]
Thus, according to the inner liner of the present invention, an inner liner of a high-temperature gas pipe that can cope with thermal expansion in a T-shaped tube or an L-shaped tube provided with a heat insulating material and a liner inside is provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the internal liner of the high-temperature gas pipe according to the present invention will be specifically described based on the embodiment shown in FIGS.
In the following embodiments, the same reference numerals are given to the same components as those shown in FIGS. 5 and 6 for the sake of simplicity.
[0019]
(First embodiment)
First, the internal liner according to the first embodiment shown in FIGS. 1 to 3 will be described.
In the first embodiment, the heat insulating material 7 is applied to the inner surface of the pressure-resistant tube 3, and the mother pipe side liner 10 and the branch pipe side liner 12 are provided on the gas contact surface of the heat insulating material 7. The present invention is applied to a T-shaped pipe in a high-temperature gas pipe provided with a leaf spring support 4 for holding 12 in a pressure-resistant pipe 3.
[0020]
As shown in FIGS. 1 to 3, a nozzle base 11 is connected to a mother pipe side liner 10 of a T-shaped pipe, and a mounting bracket 13 is provided around an axis intersection O of the mother pipe side liner 10. A pantograph-shaped leaf spring support 14 is attached thereto.
[0021]
The mother pipe side liner 10 is cut out at a portion overlapping with the mounting bracket 13 and is welded to the mounting bracket 13 by fillet welding. The attachment range and the number of the pantograph-shaped leaf spring supports 14 are determined according to the size of the nozzle 11, and when the mother pipe and the branch pipe have the same diameter, as shown in FIG. Five pantograph-shaped leaf spring supports 14 can be provided in the lower half.
[0022]
In addition, a pantograph-shaped leaf spring support 14 is attached to the pressure-resistant tube 3 by a mounting seat 15 at a position that coincides with the axis intersection point O in the axial direction of the mother pipe.
Thus, the pantograph-shaped leaf spring support 14 attached to the mother pipe side liner 10 and the pressure tube 3 absorbs the radial thermal expansion difference between the mother pipe side liner 10 and the pressure tube 3 by being deformed like a pantograph. To do.
[0023]
As described above, the attachment position of the pantograph-type leaf spring support 14 to the mother pipe side liner 10 and the attachment position of the pantograph-type leaf spring support 14 to the pressure resistant pipe 3 are the same in the axial direction of the mother pipe. As a result, the thermal expansion difference δ ′ _X between the pantograph-shaped plate spring support 14 and the pressure tube 3 becomes zero, and the mother pipe side liner 10 and the nozzle 11 do not move in the axial direction of the mother pipe. 11 can slide smoothly in the axial direction of the branch pipe.
[0024]
A pantograph-shaped plate spring support 14 is butt welded to both ends of the mounting bracket 13, and a mounting seat 15 is fillet welded to the inner surface of the pressure-resistant tube 3, and a plate is attached to the seating surface of the mounting seat 15. After the spring support 14 is fixed along the bolt 6, the fillet is welded.
[0025]
In this way, the mother pipe side liner 10 and the nozzle base 11 thermally expand in the respective axial directions starting from the axis intersection point O.
In FIG. 1, the inner liner of the straight tube connected to the T tube has the same configuration as that shown in FIG.
[0026]
(Second embodiment)
Next, an internal liner according to the second embodiment shown in FIG. 4 will be described. The internal liner shown in FIG. 4 has a heat insulating material 7 applied to the inner surface of the pressure-resistant tube 3, and a mother pipe side liner 10 and a branch pipe side liner 12 are provided on the gas contact surface of the heat insulating material 7. , 12 is applied to the L-shaped pipe in the high-temperature gas pipe provided with the leaf spring support 4 for holding the pressure-resistant pipe 3.
[0027]
The cross-sectional view taken along the line AA in FIG. 4 and the enlarged view of the portion B are the same as those in FIGS.
In the case of L-shaped pipe of the present embodiment, the the main pipe side liner 10 is connected to nozzle stub 11, pantograph type via a mounting bracket 13 about the axis intersection O of the main pipe side liner 10 A leaf spring support 14 is attached.
[0028]
The mother pipe side liner 10 is cut out at a portion overlapping with the mounting bracket 13 and is welded to the mounting bracket 13 by fillet welding. The mounting range and the number of the pantograph-shaped leaf spring supports 14 are determined according to the size of the nozzle 11, but when the main pipe and the branch pipe shown in FIG. As in the case of (5), five pantograph-shaped leaf spring supports 14 can be provided in the lower half of the mother pipe side liner 10.
[0029]
Further, a pantograph-shaped plate spring support 14 is attached to the pressure-resistant tube 3 by a mounting seat 15 at a position coinciding with the axis intersection point O in the axial direction of the mother pipe.
Thus, the pantograph-shaped leaf spring support 14 attached to the mother pipe side liner 10 and the pressure tube 3 absorbs the radial thermal expansion difference between the mother pipe side liner 10 and the pressure tube 3 by being deformed like a pantograph. To do.
[0030]
In the case of this embodiment, as described above, the mounting position of the pantograph plate spring support 14 to the mother pipe side liner 10 and the mounting position of the pantograph plate spring support 14 to the pressure tube 3 are the axis of the mother pipe. The direction is the same. As a result, the thermal expansion difference δ ′ _X between the pantograph-shaped plate spring support 14 and the pressure tube 3 becomes zero, and the mother pipe side liner 10 and the nozzle 11 do not move in the axial direction of the mother pipe. 11 can slide smoothly in the axial direction of the branch pipe.
[0031]
A pantograph-shaped plate spring support 14 is butt welded to both ends of the mounting bracket 13, and a mounting seat 15 is fillet welded to the inner surface of the pressure-resistant tube 3, and a plate is attached to the seating surface of the mounting seat 15. After the spring support 14 is fixed along the bolt 6, the fillet is welded.
Other configurations are substantially the same as those shown in FIGS. 1 to 3, and the mother pipe side liner 10 and the nozzle 11 can be thermally expanded in the respective axial directions starting from the axis intersection O.
[0032]
【The invention's effect】
As described above, in the internal liner for the T-shaped pipe or the L-shaped pipe in the high-temperature gas pipe according to the present invention, the belt-like mounting bracket is provided on the liner around the main pipe axis including the intersection of the branch pipe axis and the main pipe axis. mounting Rutotomoni, attach the mounting seat to the pressure-resistant inner surface at a position about the substrate tube axis at the intersection of said branch pipe shaft and mother tube axis, the said mounting brackets mounted on the mounting seat by pantograph Katachiban spring support breakdown voltage According to this, it is possible to provide a liner for a T-shaped tube or an L-shaped tube of a high-temperature gas pipe that does not cause a problem due to thermal expansion due to a high-temperature gas flow flowing inside.
[0033]
Therefore, by applying the internal liner of the hot gas pipe of the present invention, the hot gas is supplied to the gas turbine from the boiler in a combined power plant of a pressurized fluidized bed boiler and a gas turbine, etc. A suitable T-shaped tube used for branching and joining of pipes and an L-shaped tube for bending can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment when an internal liner of a high-temperature gas pipe of the present invention is applied to a T-shaped pipe.
2 is a cross-sectional view taken along the line AA in FIGS. 1 and 4. FIG.
3 is a partially enlarged cross-sectional view of a portion B in FIGS. 1 and 4. FIG.
FIG. 4 is a cross-sectional view shown in a second embodiment when the inner liner of the hot gas pipe of the present invention is applied to an L-shaped pipe.
FIG. 5 is a cross-sectional view showing the structure of an inner liner in a straight tubular high-temperature gas pipe.
6 is a cross-sectional view taken along line CC in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liner 2 Mounting bracket 3 Pressure-resistant pipe 4 Leaf spring support 5 Mounting seat 6 Bolt 7 Heat insulating material 10 Mother side pipe side liner 11 Base 12 Branch pipe side liner 13 Mounting bracket 14 Pantograph type leaf spring support 15 Mounting seat

Claims (1)

A liner for protecting the gas contact surface of the heat insulating material installed on the inner surface of the pressure tube from a gas flow, a leaf spring support for holding the liner on the pressure tube, and the liner on the leaf spring support An internal liner for a T-shaped tube or L-shaped tube in a high temperature gas pipe having a strip-shaped mounting bracket for mounting, and the strip-shaped mounting on the liner around the main tube axis at the intersection of the branch tube shaft and the main tube shaft Rutotomoni mounting the bracket, attaching the mounting seat to the pressure-resistant inner surface at a position about the substrate tube axis at the intersection of said branch pipe shaft and mother tube axis, said mounting brackets mounted on the mounting seat by pantograph Katachiban spring support T-shaped or L-shaped hot gas inside liner of the pipe, characterized by comprising holding the breakdown voltage tube.

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