WO2017013753A1 - 配管の補強装置、配管の補強方法 - Google Patents
配管の補強装置、配管の補強方法 Download PDFInfo
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- WO2017013753A1 WO2017013753A1 PCT/JP2015/070759 JP2015070759W WO2017013753A1 WO 2017013753 A1 WO2017013753 A1 WO 2017013753A1 JP 2015070759 W JP2015070759 W JP 2015070759W WO 2017013753 A1 WO2017013753 A1 WO 2017013753A1
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- Prior art keywords
- pipe
- reinforcing member
- reinforcing
- direction along
- longitudinal direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
- F16L55/172—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut
- F16L55/1725—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut in which the threaded pin is rigid with the hose encircling member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
- F22B37/108—Protection of water tube walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
- F16L55/172—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
Definitions
- the present invention relates to a pipe reinforcement device and a pipe reinforcement method.
- a boiler for power generation provided to rotate a turbine in a thermal power plant further comprises a economizer that preheats boiler feed water, a water cooling wall that forms a boiler housing and makes boiler feed water saturated steam, and further heats saturated steam.
- a reheater that reheats the steam from the turbine and supplies it again to the turbine.
- said superheater and reheater are comprised with the boiler pipe
- thermal stress is generated in the boiler tube as the power generating boiler is started and stopped. If the boiler for power generation continues to be used for a long period of time, creep fatigue damage will occur in the boiler tube according to thermal stress, and the outer peripheral surface of the boiler tube will bulge or the wall thickness of the boiler tube will decrease. There is a risk of deformation. Therefore, in order to prevent an accident caused by the deterioration of the boiler pipe, the deterioration state of the boiler pipe is periodically inspected, and trend management such as bulging and thinning is performed (for example, Patent Document 1). ).
- an object of the present invention is to provide a pipe reinforcing device and a pipe reinforcing method capable of extending the life of the pipe accompanying the creep fatigue damage.
- the main present invention for solving the above-mentioned problems is a pipe reinforcement device for extending the creep fatigue life of a cylindrical pipe through which steam obtained by heating water using the combustion heat of a boiler passes,
- a first reinforcing member that has a shape in surface contact with the outer peripheral surface of one half circumference of the pipe and that becomes thinner toward both ends in the direction along the longitudinal direction of the pipe, and the other half circumference of the pipe
- a second reinforcing member having a shape in surface contact with the outer peripheral surface of the pipe and having a thickness that decreases toward both ends in a direction along the longitudinal direction of the pipe, and the first reinforcing member and the first 2 a coupling member that couples the reinforcing members.
- FIG. 1 is a diagram illustrating an overall configuration of a thermal power plant in which a pipe reinforcement device according to the present embodiment is used.
- the overall configuration of the thermal power plant shown in FIG. 1 is an example for easily understanding the description of the piping reinforcing device according to the present embodiment. It is also possible to reinforce a boiler pipe in a thermal power plant having a configuration different from that of the thermal power plant of FIG. 1 using the piping reinforcing device according to the present embodiment.
- the piping reinforcement device according to the present embodiment needs to be designed in advance according to the outer diameter of the boiler pipe installed in each thermal power plant.
- the thermal power plant 1 includes a boiler 2, a steam generator 3, a water cooling wall 4, a steam valve 5, a high pressure turbine 6, a medium pressure turbine 7, a low pressure turbine 8, a reheater 9, a condenser 10, a feed water pump 11, and a power generation
- the machine 12 is configured.
- the boiler 2 mixes fuel supplied from outside (for example, coal in the form of pulverized coal) and air to generate combustion gas, and uses heat of the combustion gas (combustion heat) to change water to steam. It is.
- the boiler 2 contains a steam generator 3, a water cooling wall 4, and a reheater 9.
- the steam generator 3 includes a economizer (not shown) that preheats water supplied from the condenser 10, and a superheater (not shown) that further heats the saturated steam supplied from the water cooling wall 4 to superheated steam. ) And.
- the water cooling wall 4 forms the housing of the boiler 2 and supplies the preheated water as saturated steam to the superheater.
- the steam valve 5 is a regulating valve that controls the flow rate of superheated steam generated by the steam generator 4.
- the rotary shafts 13 of the high-pressure turbine 6, the intermediate-pressure turbine 7, and the low-pressure turbine 8 are the same and are coupled to the rotary shaft 14 of the generator 12.
- Superheated steam (first steam) generated by the steam generator 3 is supplied to the high-pressure turbine 6 via the steam valve 5.
- the high-pressure turbine 6 expands the first steam and supplies the expanded steam (second steam) to the reheater 9 in the boiler 2.
- the reheater 9 reheats the second steam and supplies it to the intermediate pressure turbine 7 as reheated steam (third steam).
- the intermediate pressure turbine 7 expands the third steam and supplies the expanded steam (fourth steam) to the low pressure turbine 8.
- the low pressure turbine 8 expands the fourth steam.
- the condenser 10 condenses the exhaust gas after the low-pressure turbine 8 expands the fourth steam and converts it into condensate.
- the feed water pump 11 boosts the condensate generated by the condenser 10 and returns it to the steam generator 3 in the boiler 2 as feed water.
- the generator 12 is driven by the power generated when the fourth steam expands so that electric power is generated.
- the steam generator 3 and the reheater 9 include a boiler pipe (pipe) for circulating steam.
- the piping reinforcement device according to the present embodiment is attached to the boiler pipe as described above. Details thereof will be described later.
- FIG. 3 is a reinforcing device according to the first embodiment, and is a perspective view showing a state after being attached to a straight pipe portion of a boiler pipe.
- FIG. 4 is a reinforcement device according to the first embodiment, and is a plan view showing a state before being attached to the straight pipe portion of the boiler pipe.
- FIG. 5 is a plan view showing a state after the reinforcing device according to the first embodiment is mounted on the straight pipe portion of the boiler pipe.
- FIG. 6 is a reinforcing device according to the first embodiment, and is another plan view showing a state after being attached to the straight pipe portion of the boiler pipe.
- the X axis is an axis along the longitudinal direction of the boiler tube, and the YZ plane formed by the Y axis and the Z axis is a plane parallel to the cross section of the boiler tube.
- the reinforcing device 100 is a device that reinforces the straight pipe portion 101 of the boiler pipe included in the steam generator 3 and the reheater 9 shown in FIG.
- the boiler pipe is formed of heat-resistant steel (for example, low alloy steel, high alloy steel, carbon steel, stainless steel), and the straight pipe portion 101 has, for example, a cylindrical shape. Further, it is assumed that the portion of the boiler pipe to which the reinforcing device 100 is attached includes a straight pipe portion 101 and a welded portion 102 that is produced as a result of welding the cross-sectional openings of adjacent boiler pipes.
- the reinforcing device 100 includes a first reinforcing member 100A and a second reinforcing member 100B that are mounted so as to be in close contact with the outer peripheral surface 103 of the straight pipe portion 101.
- the first reinforcing member 100A is made of heat-resistant steel (for example, stainless steel SUS316, SUS304).
- the first reinforcing member 100A is provided on the upper side of the straight pipe portion 101 when the straight pipe portion 101 is cut so that the XY plane formed by the X axis and the Y axis passes through the central axis of the straight pipe portion 101 ( It has a semi-cylindrical shape so as to come into surface contact with the outer circumferential surface 103 for a half circumference on the + Z side).
- the length of the first reinforcing member 100A in the direction along the X axis is, for example, such that the straight pipe portion 101 is less likely to cause creep fatigue damage or stress corrosion cracking SCC (StressrosCorrosion Cracking) according to thermal stress.
- the length is set to three times or more the diameter of the straight pipe portion 101.
- the thickness of the first reinforcing member 100A becomes thinner from the center of the first reinforcing member 100A toward both ends in the direction along the X axis so that thermal stress does not concentrate on both ends in the direction along the X axis. .
- the thickness of the first reinforcing member 100A is constant in the vicinity of the center of the first reinforcing member 100A in the direction along the X axis, but from the position away from the center of the first reinforcing member 100A toward both ends, It gradually becomes thinner at a constant rate like the outer peripheral surface of the cone.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to the length of 100 mm in the direction along the X axis.
- the thickness of both ends of the first reinforcing member 100A is set to about 5 mm.
- the first flange 104 is provided in the direction along the X axis on both sides ( ⁇ Y side) in the direction along the Y axis of the first reinforcing member 100A.
- the first flange 104 is made of heat-resistant steel (for example, stainless steel SUS316, SUS304), and has a long flat plate shape, for example.
- the first flange 104 is formed with a plurality of first holes 105 at substantially equal intervals in the direction along the X axis. Further, the first flange 104 is integrally provided by welding for the first reinforcing member 100A.
- the second reinforcing member 100B is made of heat resistant steel (for example, stainless steel SUS316, SUS304).
- the second reinforcing member 100B is provided on the lower side of the straight pipe portion 101 when the straight pipe portion 101 is cut so that the XY plane formed by the X axis and the Y axis passes through the central axis of the straight pipe portion 101. It has a semi-cylindrical shape so as to come into surface contact with the outer circumferential surface 103 corresponding to the half circumference ( ⁇ Z side).
- the length of the second reinforcing member 100B in the direction along the X-axis is, for example, the diameter of the straight pipe portion 101 so that the straight pipe portion 101 is less likely to cause creep fatigue damage or stress corrosion cracking according to thermal stress. Is set to a length three times longer than Further, the thickness of the second reinforcing member 100B becomes thinner from the center of the second reinforcing member 100B in the direction along the X axis toward both ends so that thermal stress does not concentrate at both ends in the direction along the X axis. .
- the thickness of the second reinforcing member 100B is constant in the vicinity of the center of the second reinforcing member 100B in the direction along the X-axis, but the cone increases toward the both ends from a position away from the center of the second reinforcing member 100B. It gradually becomes thinner at a constant rate like the outer peripheral surface of.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to the length of 100 mm in the direction along the X axis.
- the thickness of both ends of the second reinforcing member 100B is set to about 5 mm.
- the second flange 106 is provided in the direction along the X axis on both sides ( ⁇ Y side) in the direction along the Y axis of the second reinforcing member 100B.
- the second flange 106 is made of heat-resistant steel (for example, stainless steel SUS316, SUS304) and has a long flat plate shape.
- the second flange 106 has a plurality of second holes 107 formed at substantially equal intervals in the direction along the X axis.
- the 2nd flange 106 is integrally provided with the 2nd reinforcement member 100B by welding.
- the first reinforcing member 100A and the second reinforcing member 100B have a symmetrical shape when arranged so as to sandwich the straight pipe portion 101 between the both members 100A and 100B. . Accordingly, when the first flange 104 and the second flange 106 are overlapped in a state where the first reinforcing member 100A and the second reinforcing member 100B are arranged symmetrically with respect to the straight pipe portion 101, the first reinforcing member The inner peripheral surfaces (surfaces on the recessed side) of 100A and the second reinforcing member 100B are in surface contact with the outer peripheral surface 103 of the straight pipe portion 101, and the plurality of first holes 105 and the plurality of second holes 107 are in contact with each other.
- the reinforcing device 100 can be easily attached to the straight pipe portion 101.
- the tightening strength of the bolt 108 and the nut 109 according to the type (material) of the boiler tube and the usage environment, it is possible to appropriately suppress the occurrence of creep fatigue damage and stress corrosion cracking on the straight pipe portion 101. The remaining life of the boiler tube can be reliably extended.
- first flange 104, the second flange 106, the bolt 108, and the nut 109 are provided as means for attaching the first reinforcing member 100A and the second reinforcing member 100B to the straight pipe portion 101
- the present invention is not limited to this. is not.
- a copper belt rod (not shown) is prepared as a means to replace the first flange 104, the second flange 106, the bolt 108, and the nut 109, and covers the entire periphery of the first reinforcing member 100A and the second reinforcing member 100B. It is also possible to attach the first reinforcing member 100A and the second reinforcing member 100B to the straight pipe portion 101 by winding the band rod.
- FIG. 7 is an exploded perspective view showing the reinforcing device according to the second embodiment and showing a state before being attached to the elbow portion of the boiler pipe.
- FIG. 8 is a reinforcement device according to the second embodiment, and is a perspective view showing a state after being mounted on an elbow portion of a boiler pipe.
- FIG. 9 is a reinforcement device according to the second embodiment, and is a plan view showing a state before being attached to the elbow portion of the boiler pipe.
- FIG. 10 is a plan view showing a state after the reinforcing device according to the second embodiment is attached to the elbow portion of the boiler pipe.
- FIG. 11 is a reinforcement apparatus which concerns on 2nd Embodiment, Comprising: It is another top view which shows the state after mounting
- FIG. 12 is a reinforcing device according to the second embodiment, and is another plan view showing a state after being mounted on the elbow portion of the boiler pipe.
- the X axis is an axis along the longitudinal direction of one straight pipe portion that is joined to the elbow part by welding
- the Z axis is along the longitudinal direction of the other straight pipe part that is joined to the elbow part by welding.
- the Y axis is an axis orthogonal to the XZ plane formed by the X axis and the Z axis.
- the reinforcing device 200 is a device that mainly reinforces the elbow portion 201 of the boiler pipe included in the steam generator 3 and the reheater 9 shown in FIG.
- the boiler tube is made of heat-resistant steel (for example, low alloy steel, high alloy steel, carbon steel, stainless steel), and the elbow part 201 has a shape in which, for example, a cylinder is bent into an L shape.
- an elbow part 201, a part of the straight pipe part 202 near the elbow part 201, and a part of the straight pipe part 203 near the elbow part 201 are used as a part of the boiler pipe to which the reinforcing device 200 is attached.
- the elbow part 201 When the elbow part 201 is cut so that the XZ plane formed by the X axis and the Z axis passes through the central axis of the elbow part 201, one half piece ( ⁇ Y side) and the other half piece (+ Y side) Welded parts 204 and 205 resulting from the welding process, welded part 206 resulting from welding the cross-sectional openings of the elbow part 201 and the straight pipe part 202, and cross-sectional openings of the elbow part 201 and the straight pipe part 203 are welded. The resulting welded portion 207 is included.
- the reinforcement apparatus 200 is comprised including the 1st reinforcement member 200A and the 2nd reinforcement member 200B with which it mounts
- the first reinforcing member 200A is made of heat-resistant steel (for example, stainless steel SUS316, SUS304). Further, the first reinforcing member 200A has an L-shaped half cylinder so that the first reinforcing member 200A comes into surface contact with the outer circumferential surface 208 of the half circumference of one of the elbow part 201 and the straight pipe parts 202 and 203 (+ X side to + Z side). It has a bent shape. Further, the length L1 in the direction along the X axis of the first reinforcing member 200A that is in surface contact with the straight pipe portion 202 is such that the straight pipe portion 202 continuous to the elbow portion 201 is subjected to creep fatigue according to bending stress or thermal stress.
- the length is set to be twice or more the diameter of the straight pipe portion 202 so that damage and stress corrosion cracking are less likely to occur.
- the length L2 in the direction along the Z-axis of the first reinforcing member 200A that is in surface contact with the straight pipe portion 203 is such that the straight pipe portion 203 continuous with the elbow portion 201 is subjected to creep according to bending stress or thermal stress.
- the length is set to be twice or more the diameter of the straight pipe portion 203 so that fatigue damage and stress corrosion cracking are less likely to occur.
- the thickness of the first reinforcing member 200A that is in surface contact with the straight pipe portion 202 becomes thinner as it moves away from the elbow portion 201 so that thermal stress does not concentrate on the end in the direction along the X axis ( ⁇ X side). It has become.
- the thickness of the first reinforcing member 200A that is in surface contact with the straight pipe portion 202 is gradually reduced at a constant rate as the outer peripheral surface of the cone is away from the elbow portion 201 in the direction along the X axis.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to the length of 100 mm in the direction along the X axis.
- the thickness of the first reinforcing member 200A that is in surface contact with the straight pipe portion 203 increases as it moves away from the elbow portion 201 so that thermal stress is not concentrated on the end ( ⁇ Z side) in the direction along the Z axis. It is getting thinner.
- the thickness of the first reinforcing member 200A that is in surface contact with the straight pipe portion 203 is gradually reduced at a constant rate as the outer peripheral surface of the cone is away from the elbow portion 201 in the direction along the Z axis. Yes.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to a length of 100 mm in the direction along the Z-axis.
- the thickness of both ends of the first reinforcing member 200A is set to about 5 mm.
- the first flange 209 is provided along the bent shape of the first reinforcing member 200A on both sides ( ⁇ Y side) in the direction along the Y axis of the first reinforcing member 200A.
- the first flange 209 is made of heat-resistant steel (for example, stainless steel SUS316, SUS304), and has a shape in which a long flat plate is bent in an L shape so as to follow the bent shape of the first reinforcing member 200A, for example. Presents.
- a plurality of first holes 210 are formed in the first flange 209 at substantially equal intervals along the longitudinal direction. Further, the first flange 209 is integrally provided with the first reinforcing member 200A by welding.
- the second reinforcing member 200B is made of heat resistant steel (for example, stainless steel SUS316, SUS304). Further, the second reinforcing member 200B has a semi-cylindrical L so that the elbow part 201 and the straight pipe parts 202 and 203 are in surface contact with the outer peripheral surface 208 of the other half (-X side to -Z side). It has a bent shape. Further, the length L1 ′ in the direction along the X axis of the second reinforcing member 200B that is in surface contact with the straight pipe portion 202 is such that the straight pipe portion 202 continuous to the elbow portion 201 is subjected to creep according to bending stress or thermal stress.
- the length L2 ′ in the direction along the Z-axis of the second reinforcing member 200B that is in surface contact with the straight pipe portion 203 is such that the straight pipe portion 203 that is continuous with the elbow portion 201 responds to bending stress or thermal stress.
- the thickness of the second reinforcing member 200B that is in surface contact with the straight pipe portion 202 becomes thinner as it moves away from the elbow portion 201 so that thermal stress is not concentrated on the end in the direction along the X axis ( ⁇ X side). It has become.
- the thickness of the second reinforcing member 200B that is in surface contact with the straight pipe portion 202 is gradually reduced at a constant rate as the outer peripheral surface of the cone is away from the elbow portion 201 in the direction along the X axis.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to the length of 100 mm in the direction along the X axis.
- the thickness of the second reinforcing member 200B that is in surface contact with the straight pipe portion 203 increases with increasing distance from the elbow portion 201 so that thermal stress is not concentrated on the end in the direction along the Z axis ( ⁇ Z side). It is getting thinner.
- the thickness of the second reinforcing member 200B that is in surface contact with the straight pipe portion 203 gradually decreases at a constant rate as the outer peripheral surface of the cone increases away from the elbow portion 201 in the direction along the Z axis.
- the fixed ratio is set to a ratio that the thickness is reduced by 5 mm with respect to a length of 100 mm in the direction along the Z-axis.
- the thickness of both ends of the second reinforcing member 200B is set to about 5 mm.
- the second flange 211 is provided along the bent shape of the second reinforcing member 200B on both sides ( ⁇ Y side) in the direction along the Y axis of the second reinforcing member 200B.
- the second flange 211 is made of heat-resistant steel (for example, stainless steel SUS316, SUS304), and has a shape in which a long flat plate is bent into an L shape so as to follow the bent shape of the second reinforcing member 200B.
- the second flange 211 has a plurality of second holes 212 formed at substantially equal intervals along the longitudinal direction.
- the 2nd flange 211 is integrally provided with respect to the 2nd reinforcement member 200B by welding.
- the first reinforcing member 200A and the second reinforcing member 200B are arranged with respect to the outer peripheral surface 208 of the elbow part 201 when the first flange 209 and the second flange 211 are overlapped via the elbow part 201. It will exhibit a shape that is attached closely. That is, when the first reinforcing member 200A and the second reinforcing member 200B are arranged so as to sandwich the elbow portion 201, the first reinforcing member 200A and the second reinforcing member are overlapped when the first flange 209 and the second flange 211 are overlapped.
- the reinforcing device 200 By adopting the reinforcing device 200 according to the second embodiment, it is possible to suppress the occurrence of creep fatigue damage and stress corrosion cracking with respect to the elbow part 201 and the straight pipe parts 202 and 203 that are continuous to the elbow part 201. It is possible to extend the remaining life of the.
- the elbow part 201 has four welded parts (welded parts 204 to 207) that are likely to cause creep fatigue damage and stress corrosion cracking. is there. Further, since the first reinforcing member 200A and the second reinforcing member 200B are attached to the elbow portion 201 using the bolt 213 and the nut 214, the reinforcing device 200 can be easily attached to the elbow portion 201.
- first flange 209, the second flange 211, the bolt 213, and the nut 214 are provided as means for attaching the first reinforcing member 200A and the second reinforcing member 200B to the elbow part 201
- the present invention is not limited to this.
- a copper strip (not shown) is prepared as a means to replace the first flange 209, the second flange 211, the bolt 213, and the nut 214, and extends over the entire periphery of the first reinforcing member 200A and the second reinforcing member 200B. It is also possible to attach the first reinforcing member 200A and the second reinforcing member 200B mainly to the elbow part 201 by winding the band rod.
- the reinforcing device (100, 200) is a cylindrical pipe (straight pipe in a boiler pipe) through which steam obtained by heating water using the combustion heat of the boiler 2 passes.
- Part 101, elbow part 201) is an apparatus for extending the creep fatigue life of the pipe (101, 201), and has a shape in surface contact with the outer peripheral surface of one half circumference of the pipe (101, 201).
- the first reinforcing member (100A, 200A) whose thickness decreases toward both ends in the direction along the longitudinal direction, and a shape in surface contact with the outer peripheral surface of the other half circumference of the pipe (101, 201),
- the second reinforcing member (100B, 200B) whose thickness decreases toward both ends in the direction along the longitudinal direction of the pipe (101, 201) and the pipe (101, 201) are sandwiched between A connecting member (first flange 104, 209, second flange 106, 211, bolt 108, 213, nut 109, 214) for connecting the first reinforcing member (100A, 200A) and the second reinforcing member (100B, 200B); It has.
- the thickness of each of the first reinforcing member (100A, 200A) and the second reinforcing member (100B, 200B) is the length of the pipe (101, 201). As it goes to both ends in the direction along the direction, it becomes thinner at a constant rate.
- the straight pipe portion 101 when the straight pipe portion 101 is reinforced by the first reinforcing member 100A and the second reinforcing member 100B, the straight pipe portion 101 of the first reinforcing member 100A and the second reinforcing member 100B Each length in the direction along the longitudinal direction is set to a length that is at least three times the diameter of the straight pipe portion 101.
- the longitudinal direction of the elbow part 201 in the first reinforcing member 200A and the second reinforcing member 200B is set to be longer than the length of the elbow portion 201.
- both ends of the elbow part 201 are coupled to the straight pipe parts 202 and 203, and the length in the direction along the longitudinal direction of the pipes in the first reinforcing member 200A and the second reinforcing member 200B.
- the lengths of the straight pipe portions 202 and 203 that are in contact with each other are set to be twice or more the diameter of the straight pipe portions 202 and 203.
- the thickness of each of the first reinforcing member 200A and the second reinforcing member 200B becomes thinner as the distance from the elbow part 201 increases.
- the coupling member is provided on both sides of the first reinforcing member (100A, 200A) along the longitudinal direction of the pipe (101, 201).
- the first flange (104, 209) having the first hole (105, 210) and the longitudinal direction of the pipe (101, 201) in the second reinforcing member (100B, 200B) are overlapped with each other, and the plurality of first holes (105, 211) are overlapped. 210) and a plurality of bolts (108, 213) inserted into the plurality of second holes (107, 212) and a plurality of nuts screwed into the plurality of bolts (108, 213).
- the coupling member is a part around the first reinforcing member (100A, 200A) and the second reinforcing member (100B, 200B) as a means to replace the coupling member. It is good also as being a band stick (not shown) wound around.
- the first reinforcing member (100A, 200A) and the second reinforcing member (100B, 200B) are formed of stainless steel such as SUS316 or SUS304.
- the thermal stress is not concentrated on the pipe (101, 201), thereby extending the life of the pipe (101, 201) due to creep fatigue damage. It becomes possible.
- the reinforcing device according to the present embodiment is adopted for a boiler pipe in a thermal power plant
- the same effect as that of the present embodiment can be obtained even if it is adopted for a boiler tube installed in a nuclear power plant or a chemical plant. It is possible to obtain
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Abstract
Description
===火力発電所の全体構成===
図1は、本実施形態に係る配管の補強装置が用いられる火力発電所の全体構成を示す図である。尚、図1に示す火力発電所の全体構成は、本実施形態に係る配管の補強装置の説明を容易に理解するための一例である。本実施形態に係る配管の補強装置を用いて、図1の火力発電所とは異なる構成の火力発電所内のボイラ管を補強することも可能である。但し、本実施形態に係る配管の補強装置は、各火力発電所内に設置されるボイラ管の外径に応じて予め設計されている必要がある。
===直管部用の補強装置===
図2は、第1実施形態に係る補強装置であって、ボイラ管の直管部に装着される前の状態を示す分解斜視図である。図3は、第1実施形態に係る補強装置であって、ボイラ管の直管部に装着された後の状態を示す斜視図である。図4は、第1実施形態に係る補強装置であって、ボイラ管の直管部に装着される前の状態を示す平面図である。図5は、第1実施形態に係る補強装置であって、ボイラ管の直管部に装着された後の状態を示す平面図である。図6は、第1実施形態に係る補強装置であって、ボイラ管の直管部に装着された後の状態を示す別の平面図である。尚、X軸はボイラ管の長手方向に沿う軸であり、Y軸及びZ軸で形成されるYZ平面はボイラ管の断面と並行な面である。
===エルボー部用の補強装置===
図7は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着される前の状態を示す分解斜視図である。図8は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着された後の状態を示す斜視図である。図9は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着される前の状態を示す平面図である。図10は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着された後の状態を示す平面図である。図11は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着された後の状態を示す別の平面図である。図12は、第2実施形態に係る補強装置であって、ボイラ管のエルボー部に装着された後の状態を示す更に別の平面図である。尚、X軸は溶接加工でエルボー部に結合される一方の直管部の長手方向に沿う軸であり、Z軸は溶接加工でエルボー部に結合される他方の直管部の長手方向に沿う軸であり、Y軸はX軸及びZ軸で形成されるXZ平面に直交する軸である。
2 ボイラ
3 蒸気発生器
9 再熱器
100,200 補強装置
100A,200A 第1補強部材
100B,200B 第2補強部材
101,202,203 直管部
102,204~207 溶接部
103,208 外周面
104,209 第1フランジ
105,210 第1孔
106,211 第2フランジ
107,212 第2孔
108,213 ボルト
109,214 ナット
201 エルボー部
Claims (10)
- ボイラの燃焼熱を用いて水を加熱することによって得られる蒸気が通過する円筒型の配管のクリープ疲労寿命を延伸させる配管の補強装置であって、
前記配管における一方の半周分の外周面に対して面接触する形状を呈し、前記配管の長手方向に沿う方向の両端に向かうにつれて肉厚が薄くなる第1補強部材と、
前記配管における他方の半周分の外周面に対して面接触する形状を呈し、前記配管の長手方向に沿う方向の両端に向かうにつれて肉厚が薄くなる第2補強部材と、
前記配管を挟んで前記第1補強部材及び前記第2補強部材を結合する結合部材と、
を備えたことを特徴とする配管の補強装置。 - 前記第1補強部材及び前記第2補強部材の夫々の肉厚は、前記配管の長手方向に沿う方向の両端に向かうにつれて一定割合で薄くなる
ことを特徴とする請求項1に記載の配管の補強装置。 - 前記第1補強部材及び前記第2補強部材で前記配管の直管部を補強する場合、前記第1補強部材及び前記第2補強部材における前記配管の長手方向に沿う方向の夫々の長さは、前記配管の直径の3倍以上の長さに設定される
ことを特徴とする請求項1又は請求項2に記載の配管の補強装置。 - 前記第1補強部材及び前記第2補強部材で前記配管のエルボー部を補強する場合、前記第1補強部材及び前記第2補強部材における前記配管の長手方向に沿う方向の夫々の長さは、前記エルボー部の長さよりも長く設定される
ことを特徴とする請求項1又は請求項2に記載の配管の補強装置。 - 前記エルボー部の両端は、前記配管の直管部と結合され、
前記第1補強部材及び前記第2補強部材における前記配管の長手方向に沿う方向の長さのうち、前記直管部と接触する夫々の長さは、前記配管の直径の3倍以上の長さに設定される
ことを特徴とする請求項4に記載の配管の補強装置。 - 前記第1補強部材及び前記第2補強部材の夫々の肉厚は、前記エルボー部から遠ざかるにつれて薄くなる
ことを特徴とする請求項4又は請求項5に記載の配管の補強装置。 - 前記結合部材は、
前記第1補強部材における前記配管の長手方向に沿う方向の両側に設けられ、複数の第1孔を有する第1フランジと、
前記第2補強部材における前記配管の長手方向に沿う方向の両側に設けられ、複数の第2孔を有する第2フランジと、
前記第1フランジ及び前記第2フランジが重なり合った状態で前記複数の第1孔及び前記複数の第2孔に挿入される複数のボルトと、
前記複数のボルトに螺合される複数のナットと、
を含む
ことを特徴とする請求項1~請求項6の何れか一項に記載の配管の補強装置。 - 前記結合部材は、
前記第1補強部材及び前記第2補強部材の周囲に巻回される帯棒を含む
ことを特徴とする請求項1~請求項6の何れか一項に記載の配管の補強装置。 - 前記第1補強部材及び前記第2補強部材は、ステンレス鋼で形成される
ことを特徴とする請求項1~請求項8の何れか一項に記載の配管の補強装置。 - ボイラの燃焼熱を用いて水を加熱することによって得られる蒸気が通過する円筒型の配管のクリープ疲労寿命を延伸させる配管の補強方法であって、
前記配管における一方の半周分の外周面に対して面接触する形状を呈し、前記配管の長手方向に沿う方向の両端に向かうにつれて肉厚が薄くなる第1補強部材と、前記配管における他方の半周分の外周面に対して面接触する形状を呈し、前記配管の長手方向に沿う方向の両端に向かうにつれて肉厚が薄くなる第2補強部材と、を結合部材で結合する
ことを特徴とする配管の補強方法。
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CA2993291A CA2993291A1 (en) | 2015-07-22 | 2015-07-22 | Pipe reinforcement device and pipe reinforcement method |
PCT/JP2015/070759 WO2017013753A1 (ja) | 2015-07-22 | 2015-07-22 | 配管の補強装置、配管の補強方法 |
JP2016540056A JP6026711B1 (ja) | 2015-07-22 | 2015-07-22 | 配管の補強装置、配管の補強方法 |
US15/744,248 US20180209577A1 (en) | 2015-07-22 | 2015-07-22 | Pipe reinforcement device and pipe reinforcement method |
EP15898912.9A EP3327348A4 (en) | 2015-07-22 | 2015-07-22 | Pipe reinforcement device and pipe reinforcement method |
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JP2017156065A (ja) * | 2016-03-04 | 2017-09-07 | 中国電力株式会社 | ボイラ管の補強装置、ボイラ管の補強方法 |
WO2018142500A1 (ja) * | 2017-02-01 | 2018-08-09 | 中国電力株式会社 | 補強材の作製方法 |
KR20220001895A (ko) * | 2020-06-30 | 2022-01-06 | 비에이치아이 주식회사 | 순환유동층연소 보일러용 재열기의 설치 구조 및 방법 |
KR20220001894A (ko) * | 2020-06-30 | 2022-01-06 | 비에이치아이 주식회사 | 순환유동층연소 보일러용 재열기 |
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CN109635341A (zh) * | 2018-11-14 | 2019-04-16 | 东方电气集团东方锅炉股份有限公司 | 一种尾部三烟道二次再热锅炉的受压件寿命预测方法 |
DE102019005004A1 (de) * | 2019-07-17 | 2021-01-21 | Pharmatec GmbH | Vorrichtung und Verfahren zur Stabilisierung von elastomeren Kompensatoren während der Sterilisierungsphase |
US20230204132A1 (en) * | 2020-06-05 | 2023-06-29 | Amgen Inc. | Tubing support device and method of manufacture |
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US20180209577A1 (en) | 2018-07-26 |
EP3327348A1 (en) | 2018-05-30 |
JPWO2017013753A1 (ja) | 2017-07-27 |
EP3327348A4 (en) | 2018-08-01 |
JP6026711B1 (ja) | 2016-11-16 |
CA2993291A1 (en) | 2017-01-26 |
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