JP3992547B2 - Temperature reduction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temperature reducing device that is installed in a boiler device such as a business boiler or an industrial boiler and injects a low-temperature fluid into a high-temperature fluid for steam temperature control, and in particular sprays the low-temperature fluid into the high-temperature fluid. The present invention relates to a support structure for a spray nozzle or a protective cylinder that protects the spray nozzle.
[0002]
[Prior art]
FIG. 22 shows a schematic system of a boiler adopting the exhaust gas recirculation combustion method. In the figure, 51 is a boiler furnace, 52 is a water cooling wall surrounding the boiler furnace 51, 53 is a burner, 54 is a convection heat transfer section of the boiler, and 55 and 56 are superheaters and reheaters disposed in the convection heat transfer section 54. , 57 is the boiler flue, 58 is the economizer, 59 is the exhaust gas recirculation fan, 60 is the exhaust gas recirculation system for recirculating the exhaust gas from the flue 7 at the boiler outlet to the furnace bottom 61 of the boiler furnace 51, 62 A damper for controlling the amount of exhaust gas in the exhaust gas recirculation system 60, 63 is a temperature reducing device provided at the inlet of the superheater 55, 64 is a temperature reducing device water injection adjusting valve, 65 is a cooling water piping, and 66 is a steam piping.
[0003]
In such a configuration, a section is formed by the water cooling wall 52 and fuel and air are injected into the burner 53 of the boiler furnace 51 from a fuel system and a combustion air system (not shown) and burned, and radiant heat from the formed high-temperature flame is used. The working medium (water) flowing in the water cooling wall 52 is heated and evaporated, and this working medium is further guided to the superheater 55 and the reheater 56 of the convection heat transfer section 54, and predetermined by the high-temperature combustion gas from the boiler furnace 51. It is heated so that it may become the steam conditions.
[0004]
In this type of power generation boiler, it is necessary to keep the outlet steam temperature of the superheater 55 and the reheater 56 constant over the widest possible range of the load in order to maintain power plant efficiency.
[0005]
As a feature of recent power demand, thermal power generation has shifted from base load to load adjustment, and is forced to start and stop frequently and load changes. As the load changes, the amount of fuel input is changed by adjusting the steam flow rate, and the steam temperature fluctuates. Therefore, spray water is injected by the temperature reducing device to keep the steam temperature constant.
[0006]
With the increase in the number of spray water injections, the spray nozzle has a double pipe structure to reduce the thermal stress in the spray nozzle, and the spray nozzle has been endured and reliable. The spray water in the reheater system employs an intermittent control system that is introduced when the load changes in order to increase boiler efficiency.
FIG. 23 is a diagram illustrating an example of a reheater system. The steam discharged from the high-pressure turbine is sent to the primary reheater 72 through the primary reheat steam pipe 71, where it is superheated and sent to the secondary reheater 73. When steam is sent from the primary reheater 72 to the secondary reheater 73, low-temperature spray water is injected from the spray nozzle in the temperature reducing device 74 in order to keep the steam temperature constant. In the figure, 75 is a primary reheater lower header, 76 is a primary reheater upper header, 77 is a secondary reheater lower header, and 78 is a secondary reheater upper header.
[0007]
Since reheat steam is a high-temperature fluid and spray water is a low-temperature fluid, a thermal stress is repeatedly generated due to a large temperature difference in the spray nozzle and the like, resulting in a decrease in life and damage.
[0008]
In order to prevent this, the conventional temperature reducing apparatus has a structure as shown in FIG. In the figure, 81 is spray water, 82 is reheater inlet steam, 83 is spray nozzle cooling steam, 84 is an inlet nozzle, 85 is a spray nozzle, 86 is a protective cylinder, 87 is a spray water spray window (spray nozzle opening), 88 Is a spray nozzle cooling steam pipe, 89 is a temperature reducing device mother pipe, 90 is a protective cylinder, 91 is a diaphragm, 92 is a spray nozzle body, 93 is a cylinder, 94 is an end plate, 95 and 96 are nozzle insertion holes, and 97 is a nozzle , 98 is a protrusion, and 99 is a tip.
[0009]
As shown in the figure, a double tube structure is provided in which a protective cylinder 86 is provided so as to surround the spray nozzle 85 so that the reheater inlet steam 82 does not directly touch the spray nozzle 85. A spray nozzle cooling steam 83 having an intermediate temperature between the reheater steam temperature and the spray water temperature is caused to flow between the spray nozzle 85 and the protective cylinder 86 to reduce thermal stress due to intermittent injection of spray water. .
[0010]
Further, when the diameter of the temperature reducing device mother pipe 89 is increased, spray water ejected from the spray nozzle 85 is injected into the central portion of the temperature reducing device mother pipe 89 as much as possible. The rigidity of the spray nozzle 85 placed in the temperature device mother pipe 89 is lowered. The influence of Karman vortices generated on the downstream side in the steam flow direction of the spray nozzle 85 is increased by the steam flowing in the temperature reducing device main pipe 89 as the rigidity decreases.
[0011]
As a result, the gap between the outer diameter at the tip 99 of the protective cylinder 86 and the inner diameter of the cylinder 93 needs to be as narrow as possible. Therefore, it is difficult to insert and support the protective cylinder tip 99, and the protective cylinder tip 99 is prone to excessive thermal damage because it is close to the cylinder 93, and inspection and repair of the part are frequently performed. is necessary.
[0012]
Further, in the temperature reducing device described in Japanese Patent Laid-Open No. 8-28809, the length of the protective cylinder and the cylindrical body is set to 1/3 or more of the inner diameter of the temperature reducing apparatus mother pipe. Since there is a limit on the gap between the cylinder and the inner diameter of the cylinder, the frictional force is large and the protective cylinder cannot be removed easily, and the protective cylinder cannot be easily installed on the cylinder at the site. It must be structured. Therefore, it takes a considerable number of days to repair the temperature reducing device.
[0013]
In addition, the thermal expansion difference in the axial direction of the protective cylinder generated by the temperature difference between the protective cylinder and the cylindrical body that occurs during the start / stop process of the boiler device must be absorbed by the sliding structure of the protective cylinder tip. In the temperature reducing device described in Japanese Patent No. -28809, the lengths of the protective cylinder and the cylinder are set to 1/3 or more of the inner diameter of the temperature reducing apparatus main tube, so that the contact length is increased and the frictional resistance is increased. The difference in thermal expansion in the axial direction of the protective cylinder cannot be absorbed smoothly.
[0014]
[Problems to be solved by the invention]
In recent years, the demand for electric power has changed to frequent load change operation, and as a result, the main steam temperature has to be changed, so in order to keep the main steam temperature constant, The frequency of injecting or not injecting is increasing. Along with this, the heating from the steam and the cooling with the low temperature spray water flowing inside the nozzle are repeated each time the spray water is injected, and the thermal stress is generated and damaged each time, and the thermal fatigue gradually increases. There is a problem that the spray nozzle itself is cracked due to accumulation.
[0015]
Recently, as commercial boilers are becoming larger and larger, plant shutdowns other than periodic inspections do not lead to a stable supply of power, so they must be set up rapidly. Therefore, in order to easily carry out the maintenance and management of the temperature reducing device, it is urgently required to have a structure that can be easily repaired locally.
[0016]
In the conventional temperature reducing apparatus shown in FIG. 24, the inlet nozzle 84 and the protective cylinder 86 welded at the factory, for example, at the position (1) of the broken line portion, are connected to the temperature reducing apparatus main pipe 89 from the nozzle insertion holes 95 and 96 on site. After inserting and setting, the assembly was performed by welding with the nozzle 97 at the position (2) of the broken line. The welding at the positions (1) and (2) is butt welding performed in the circumferential direction.
[0017]
The cylinder 93 and the end plate 94 constitute both a sealing structure and a nozzle tip support structure. Although the cylindrical body 93 and the end plate 94 are not shown in the drawing, they also have a structure for accumulating drains generated by cooling of a minute leak of steam from the gap between the nozzle tip and the nozzle insertion hole 96. The cylinder 93 or the end plate 94 is provided with a drain (not shown).
[0018]
The problem here is that the protective cylinder is relatively thin and long. For example, since the outer diameter of the temperature reducing device mother pipe 89 is 800 to 1600 mm in diameter, the length of the protective cylinder 86 is longer than that. The outer diameter of the protective cylinder 86 is 100 to 1200 mm in diameter, and the outer diameter of the tip of the protective cylinder is only about 60 to 80 mm in diameter. Thus, since the protection cylinder 86 is thin and long, it is deformed by a high-temperature steam flow of several hundred degrees Celsius. For this reason, the nozzle insertion hole 96 has such a hole diameter that a sufficient gap is formed in order to prevent the tip end portion of the nozzle from galling.
[0019]
However, it is indispensable to support the tip 99 of the protective cylinder 86 by the cylinder 93. If the tip 99 of the protective cylinder 86 is not supported, both the spray nozzle 85 and the protective cylinder 86 repeat vibration and are damaged by fatigue. Therefore, as shown in FIG. 24, a projection 98 is provided on the inner peripheral wall of the cylindrical body 93 to form a minute gap with an outer diameter tolerance of 0.1 mm or less, and is supported at the initial stage of deformation.
[0020]
By the way, since the temperature reducing device mother pipe 89 and the cylinder 93 are welded at the factory and subjected to stress relief processing, a method of welding the end plate 94 to the cylinder 93 is adopted at the site. Due to the thermal deformation of the cylindrical body 93 due to the above, the above-mentioned minute gap between the protective cylinder 86 and the projection 98 disappears or conversely increases.
[0021]
In the case of inspecting the nozzle during the periodic inspection, after stopping the boiler, the nozzle was cut out by cutting at the portions indicated by the broken lines (1) and (2) in FIG. If there is no minute gap between the projection 98 and the projection 98, the nozzle is difficult to be removed, and it is difficult to insert the nozzle when it is inserted again after the inspection.
[0022]
Further, when the gap between the protective cylinder 86 and the protrusion 98 becomes large, both the spray nozzle 85 and the protective cylinder 86 repeatedly vibrate and have problems such as damage due to fatigue.
[0023]
The object of the present invention is to eliminate the drawbacks of the prior art as described above, to easily insert and pull out the spray nozzle and the protective cylinder, and to be excellent in reliability and durability that can prevent a damage accident caused by vibration of the spray nozzle and the protective cylinder. It is to provide a temperature reducing device.
[0024]
[Means for Solving the Problems]
In order to achieve the above object, the first means of the present invention is to form a pair of nozzle insertion holes facing the peripheral wall of the temperature reducing device main pipe through which high-temperature steam flows, and from one of the nozzle insertion holes, a spray nozzle or a spray nozzle And a protective cylinder provided so as to surround the spray nozzle, the tip of the spray nozzle or the tip of the protective cylinder passes through the other nozzle insertion hole and protrudes outward from the temperature reducing device main pipe, and the protrusion In a temperature reducing device having a distal end surrounded by a cylindrical body attached to the peripheral wall of the temperature reducing device mother pipe and an end plate that closes the opening of the cylindrical body, the inner side of the cylindrical body is separated from the cylindrical body and the end plate. A tip end supporting means connected to the peripheral wall of the temperature reducing device mother pipe is provided at the above position.
[0025]
According to a second means of the present invention, in the first means, the tip portion supporting means has a bolt, and the tip portion supporting means with respect to the tip portion protruding from the temperature reducing device mother pipe by tightening of the bolt. The dimensional tolerance is configured to be adjustable.
[0026]
According to a third means of the present invention, in the first means, the tip end supporting means is a mother pipe fixing inclined ring fixed to a peripheral wall of the temperature reducing device mother pipe, the mother pipe fixing inclined ring, and the tip. It comprises a slide ring interposed between the parts, a pressing metal that presses the sliding ring, and a bolt that is screwed into the mother pipe fixing inclined ring via the pressing metal. .
[0027]
According to a fourth means of the present invention, in the first means, the tip end supporting means includes a mother pipe fixing ring fixed to a peripheral wall of the temperature reducing device mother pipe, and an inner surface from the outer peripheral surface of the mother pipe fixing ring. It comprises a plurality of bolts screwed to the peripheral surface and a ring pressed to the tip end side by the bolts.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a temperature reducing device for a reheater according to the first embodiment.
[0029]
In the figure, 1 is spray water (cold fluid), 2 is reheater inlet steam (hot fluid), 3 is spray nozzle cooling steam, 4 is an inlet nozzle, 5 is spray nozzle, 6 is a protective cylinder, and 7 is for spraying spray water. Window (spray nozzle opening), 8 is a spray nozzle cooling steam pipe, 9 is a temperature reducing device mother pipe, 10 is a protective cylinder, 11 is a diaphragm, 12 is a spray nozzle body, 13 is a spray nozzle spray hole, 14 and 15 are nozzle insertion holes, Reference numeral 19 denotes a slide ring, 20 denotes a mother tube fixing inclined ring, 21 denotes a press fitting, 22 denotes a bolt, 25 denotes a cylinder, 26 denotes an end plate, 27 denotes a protective cylinder tip, and 28 denotes a drain plug.
[0030]
As shown in FIG. 1, the supporting structure of the protection tube tip 27 includes a mother tube fixing inclined ring 20 welded and fixed to the peripheral wall of the temperature reducing device mother tube 9, and a mother tube fixing inclined ring 20 and a protection tube tip 27. It comprises a slide ring 19 interposed therebetween, a holding metal 21 for holding the slide ring 19, and a bolt 22 screwed into the mother pipe fixing inclined ring 20 via the holding metal 21.
[0031]
As shown in the figure, the surface of the mother tube fixed inclined ring 20 that faces the slide ring 19 is an inclined surface. Further, the surface of the slide ring 19 that faces the mother tube fixing inclined ring 20 is an inclined surface, and the surface that faces the protective tube tip 27 is a surface parallel to the axial direction.
[0032]
Of the pair of nozzle insertion holes 14, 15 provided so as to face the peripheral wall of the temperature reducing device mother pipe 9, the nozzle insertion hole 14 is sized so that the protective cylinder 6 can be freely inserted, and the nozzle insertion hole 15 is Since each of the tip portions 27 of the protective cylinder 6 is designed to be freely inserted, the spray nozzle 5 and the protective cylinder 6 are smoothly inserted into the temperature reducing device mother pipe 9.
[0033]
After the spray nozzle 5 and the protective cylinder 6 are mounted, the slide ring 19, the pressing metal 21 and the bolt 22 are set, and the bolt 22 is tightened to move the slide ring 19 upward via the pressing metal 21. Is disposed opposite the protective cylinder tip 27 with an appropriate dimensional tolerance (for example, within 0.1 mm). After the tolerance is set on site in this manner, the end plate 26 is welded to the cylindrical body 25 to complete the assembly. By providing an appropriate dimensional tolerance as described above, the protective cylinder 6 can be expanded and contracted in the axial direction as indicated by an arrow X.
[0034]
In the periodic inspection, the end plate 26 is removed and the bolt 22 is loosened, so that the slide ring 19 is sufficiently separated from the protective cylinder tip 27, and the spray nozzle 5 and the protective cylinder 6 can be easily removed.
[0035]
In the above-described method, the slide ring 19, the presser fitting 21, and the bolt 22 are set and the bolt 22 is tightened after the spray nozzle 5 and the protective cylinder 6 are mounted. 21, the bolt 22 may be set in advance, the spray nozzle 5 and the protective cylinder 6 may be attached in this state, and then the bolt 22 may be tightened.
[0036]
FIG. 2 is an enlarged plan view of the presser fitting 21. As shown in FIG. 2, the presser fixture 21 has a ring shape, and an insertion hole 30 is formed through which the bolt 22 is inserted at a predetermined interval in the circumferential direction. Has been. The inner diameter of the presser fitting 21 is designed to be sufficiently larger than the outer diameter of the protective cylinder tip 27.
[0037]
3 to 5 are perspective views showing various forms of the slide ring 19. The slide ring 19 in FIG. 3 has no slit, the slide ring 19 in FIG. 4 has a slit, and the slide ring 19 in FIG. 5 is divided into a plurality.
[0038]
3 to 5, the type for setting the dimensional tolerance at the protective cylinder tip 27 is roughly divided into the following three types.
[0039]
(Type 1)
The type using the slide ring 19 having no slit shown in FIG. 3, the tolerance between the inner diameter and the outer diameter of the slide ring 19 and the protective cylinder tip 27 is predetermined, and the bolt 22 is tightened to have a predetermined dimensional tolerance. The slide ring 19 faces the protective cylinder tip 27. Accordingly, the presser fitting 21 and the bolt 22 are for fixing the slide ring 19.
[0040]
(Type 2)
This type uses a slide ring 19 having slits 30 shown in FIG. The outer diameter of the protective cylinder tip 27 is measured in advance, and the slit 30 is provided in the slide ring 19 having a slightly larger inner diameter.
[0041]
There are the following two types of tolerance setting methods.
The first setting method is a method of setting a tolerance according to the degree of tightening of the bolt 22 using the slide ring 19 in which only the slit 30 shown in FIG. 4A is formed. 6 is a cross-sectional view taken along line AA in FIG. 4A, and FIG. 7 is a plan view of the slide ring 19 shown in FIG. As shown in FIG. 1, the surfaces of the slide ring 19 and the mother pipe fixing inclined ring 20 that are in contact with each other are inclined, and the pitch of the bolts 22 is known in advance. Thus, the dimensional tolerance of the slide ring 19 with respect to the protective cylinder tip 27 can be set.
[0042]
As shown in FIGS. 4B, 8, and 9, the second setting method includes at least one slide ring 19 having a slit 30 and an inner diameter adjusting bolt 32 that adjusts the inner diameter of the slide ring 19. This method is used. 8 is a cross-sectional view taken along line BB in FIG. 4B, and FIG. 9 is a cross-sectional view taken along line CC in FIG. 4B. As shown in FIG. 9, the inner diameter of the slide ring 19 is adjusted with the bolt 32, and then tightened with the bolt 22 to set a dimensional tolerance.
[0043]
FIG. 10 is a cross-sectional view showing a modification of the second setting method. In this example, the inner diameter of the slide ring 19 is adjusted by inserting the gap adjusting plate 33 into the slit 30 and tightening the bolt 32.
[0044]
In the second setting method, the presser fitting 21 and the bolt 22 are for fixing the slide ring 19.
[0045]
(Type 3)
As shown in FIG. 5, this is a type using a slide ring 19 divided into a plurality of parts (in this example, two parts). 11 is a view taken along the line DD in FIG. 5, and FIG. 12 is a cross-sectional view taken along the line E-E in FIG. As shown in FIGS. 5 and 12, the two divided slide ring halves 19 a and 19 b are connected by a plurality of (in this example, four) inner diameter adjusting bolts 32 via a gap adjusting plate 33. One slide ring 19 is configured. The inner diameter of the slide ring 19 is adjusted by the tightening condition of the inner diameter adjusting bolt 32. In this example, the gap adjusting plate 33 is used. However, the inner diameter of the slide ring 19 can be adjusted only by tightening the inner diameter adjusting bolt 32 without using the gap adjusting plate 33.
[0046]
This type 3 has a feature that the allowable range of the inner diameter tolerance of the slide ring 19 is wider than that of the type 2.
[0047]
In any of the above types, a double nut is used or fixing is performed by a method such as temporary welding so that the bolt 22 does not loosen. Thereafter, an end plate 26 is welded to the cylinder 25 as shown in FIG. The end plate 26 is provided with a drain drain plug 28. When the drain is accumulated, the drain drain plug 28 is removed and the accumulated drain is discharged.
[0048]
Since the sealing structure by the cylinder 25 and the end plate 26 and the support structure by the slide ring 19, the mother pipe fixing inclined ring 20, the holding fitting 21 and the bolt 22 are separated and separated, the end plate 26 is attached to the cylinder 25. Even if the cylindrical body 25 is deformed by heat at the time of welding, it does not affect the support structure, so there is no concern that the protective cylinder 6 or the like cannot be removed as in the conventional case.
[0049]
FIG. 13 is a longitudinal sectional view of a temperature reducing device according to the second embodiment of the present invention. In the case of this embodiment, the supporting structure of the protective cylinder tip 27 includes a mother tube fixing ring 24 fixed to the peripheral wall of the temperature reducing device mother tube 9 and a screw from the outer peripheral surface of the mother tube fixing ring 24 to the inner peripheral surface. It comprises a plurality of inserted tolerance setting bolts 22 and a tolerance setting ring 23 pressed by the tolerance setting bolts 22. By tightening the bolt 22, the protective cylinder tip 27 is supported by the ring 23 with a predetermined dimensional tolerance.
[0050]
FIG. 14 is an enlarged cross-sectional view showing an engagement relationship among a tolerance setting bolt, a tolerance setting ring, and a mother tube fixing ring in the temperature reducing device. As shown in the figure, a plurality of tolerance setting bolts 22 (four in this example) are screwed at substantially equal intervals along the circumferential direction of the mother pipe fixing ring 24, so that the tolerance setting ring 23 is moved in the circumferential direction. Are pressed almost evenly.
[0051]
In the second embodiment, the type for setting the dimensional tolerance at the protective cylinder tip 27 is roughly divided into the following three types.
[0052]
(Type 1)
The tolerance setting ring 23 having no slit shown in FIG. 15 is used, and the tolerance between the inner diameter and the outer diameter of the tolerance setting ring 23 and the protective cylinder tip 27 is predetermined. When the bolts 22 are tightened, the tolerance setting ring 23 faces the protective cylinder tip 27 with a predetermined dimensional tolerance. Therefore, the bolt 22 is for fixing the tolerance setting ring 23.
[0053]
(Type 2)
This type uses the tolerance setting ring 23 in which the slit 34 shown in FIG. The outer diameter of the protective cylinder tip 27 is measured in advance, and a slit 34 is provided in the tolerance setting ring 23 having an inner diameter slightly larger than this. The tolerance setting ring 23 is set to the tolerance of the tolerance setting ring 23 with respect to the protective cylinder tip 27 by the tightness of the tolerance setting bolt 22. Since the pitch of the bolts 22 is known in advance, the dimensional tolerance with respect to the protection tube tip 27 can be set by the tightening degree of the bolts 22, that is, the rotation angle of the bolts 22.
[0054]
(Type 3)
17A is a type that uses a tolerance setting ring 23 in which slits 34 shown in FIG. 17A are formed, and at least one inner diameter adjusting bolt 32 that adjusts the inner diameter of the tolerance setting ring 23. The inner diameter of the tolerance setting ring 23 is adjusted by the bolt 32 and then tightened by the bolt 22.
[0055]
FIG. 17B is a cross-sectional view showing a modification of type 3. In this example, the inner diameter of the tolerance setting ring 23 is adjusted by inserting the gap adjusting plate 33 into the slit 34 and tightening the bolt 32. In this type 3, the bolt 22 is for fixing the tolerance setting ring 23.
[0056]
In any of the above types, the double nut 35 is used as shown in FIG. 18 so that the bolt 22 does not loosen, or is fixed by a method such as temporary welding after setting the tolerance. Thereafter, in order to obtain a seal structure, an end plate 26 is welded to the cylinder 25 as shown in FIG.
[0057]
19 is a cross-sectional view of a temperature reducing device according to a third embodiment of the present invention, FIG. 20 is a vertical cross-sectional view of a slide ring used in the temperature reducing device, and FIG. 21 is a cross-sectional view taken along line 20F-F.
[0058]
This embodiment is a combination of the first embodiment and the second embodiment. As shown in FIG. 19, a mother pipe fixing inclined ring 20 welded to the outer peripheral wall of the mother pipe 9 and a mother pipe fixing inclined ring 20 are provided. And a slide ring 19 interposed between the front end 27 of the protective cylinder, a holding metal 21 for holding the slide ring 19, a bolt 22a screwed into the mother pipe fixing inclined ring 20 via the holding metal 21, and a mother pipe fixing The bolt 22 b is screwed from the outer peripheral wall of the inclined ring 20 toward the slide ring 19.
[0059]
The bolt 22a is screwed in a direction parallel to the axial direction of the slide ring 19, and the bolt 22b is screwed in a direction orthogonal to the axial direction of the slide ring 19, that is, both the bolts 22a and 22b are screwed in directions orthogonal to each other.
[0060]
As shown in the figure, the surface of the mother tube fixed inclined ring 20 that faces the slide ring 19 is an inclined surface. In addition, the surface of the slide ring 19 that faces the mother tube fixing inclined ring 20 is an inclined surface, and the surface that faces the protective cylinder tip 27 is a surface parallel to the axial direction.
[0061]
Further, as shown in FIGS. 20 and 21, a recess 36 into which the tip of the bolt 22 b is inserted is formed on the outer periphery of the slide ring 19. The recess 36 has a long oval shape along the moving direction (vertical direction) of the slide ring 19 in order to allow movement of the slide ring 19 during tightening.
[0062]
As the slide ring 19, the type of any of the types described above with reference to FIGS. 3, 4 (a), (b) and FIG. 5 is used.
[0063]
In this support structure, by tightening the bolt 22a, the slide ring 19 moves upward via the presser fitting 21, and by further tightening the bolt 22b, the slide ring 19 has a predetermined dimension with respect to the protective cylinder tip portion 27. Confront with tolerance. After the tolerance is set on site in this manner, the end plate 26 is welded to the cylindrical body 25.
[0064]
In each of the embodiments described above, the case where the front end portion of the protective cylinder is supported has been described. However, the present invention is not limited to this, and the temperature reducing device directly supports the front end portion of the spray nozzle without using the protective cylinder. Applicable.
[0065]
【The invention's effect】
As described above, the first means according to claim 1 of the present invention is the tip support means connected to the peripheral wall of the temperature reducing device mother pipe at the position inside the cylinder and away from the cylinder and the end plate. Since the support means is not affected even if the cylinder is deformed by the heat generated when the end plate is welded to the cylinder, the protective cylinder, spray nozzle, etc. are removed. There is no worry about disappearance, and work at the time of inspection and repair is easy.
[0066]
In addition, since there is no thermal influence as described above, it is possible to prevent a damage accident caused by vibration of the spray nozzle and the protective cylinder, and it is possible to provide a temperature reducing device excellent in reliability and durability.
[0067]
The second means according to claim 2 of the present invention is that, as described above, the tip portion supporting means has a bolt, and the tip portion supporting means for the tip portion protruding from the temperature reducing device main tube due to the tightening of the bolt. Since the dimensional tolerance can be adjusted, it is convenient that the dimensional tolerance can be set appropriately and easily according to the outer diameter of the tip portion. Further, when inspecting or repairing the spray nozzle and the protective cylinder, the bolts are loosened to facilitate the insertion and extraction of the spray nozzle and the protective cylinder.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a temperature reducing device according to a first embodiment of the present invention.
FIG. 2 is an enlarged plan view of a press fitting used in the temperature reducing device.
FIG. 3 is a perspective view of a slide ring without slits used in the temperature reducing device.
4A and 4B are perspective views of a slide ring with a slit used in the temperature reducing device. FIG.
FIG. 5 is a perspective view of a split slide ring used in the temperature reducing device.
6A is a cross-sectional view taken along line AA in FIG.
7 is a plan view of the slide ring shown in FIG.
FIG. 8 is a cross-sectional view taken along line BB in FIG.
FIG. 9 is a sectional view taken along line CC in FIG.
FIG. 10 is a cross-sectional view showing a modified example of the slide ring.
FIG. 11 is an arrow view on the line D-D in FIG. 5.
12 is a cross-sectional view taken along the line E-E in FIG.
FIG. 13 is a longitudinal sectional view of a temperature reducing device according to a second embodiment of the present invention.
FIG. 14 is an enlarged cross-sectional view showing an engagement relationship among a tolerance setting bolt, a tolerance setting ring, and a mother tube fixing ring in the temperature reducing device.
FIG. 15 is a transverse cross-sectional view of a slitless tolerance setting ring used in the temperature reducing device.
FIG. 16 is a cross-sectional view of a tolerance setting ring with slits used in the temperature reducing device.
FIGS. 17A and 17B are cross-sectional views of a tolerance setting ring using an inner diameter adjusting bolt with a slit used in the temperature reducing device. FIGS.
FIG. 18 is a partially enlarged cross-sectional view showing a structure in which a tolerance setting bolt is fixed using a double nut in a temperature reducing device according to a second embodiment of the present invention.
FIG. 19 is a longitudinal sectional view of a temperature reducing device according to a third embodiment of the present invention.
FIG. 20 is an enlarged vertical sectional view of a slide ring used in the temperature reducing device.
FIG. 21 is a cross-sectional view taken along line 20F-F.
FIG. 22 is a schematic system diagram of a boiler adopting an exhaust gas recirculation combustion method.
FIG. 23 is a diagram showing an example of a reheater system.
FIG. 24 is a longitudinal sectional view of a conventional temperature reducing apparatus.
[Explanation of symbols]
1 Spray water (low temperature fluid)
2 Reheater inlet steam (high temperature fluid)
3 Spray nozzle cooling steam
4 Inlet nozzle
5 Spray nozzle
6 protection cylinder
7 Spray water spray window
8 Spray nozzle cooling steam pipe
9 Temperature reduction device
10 Protection cylinder
11 Diaphragm
12 Spray nozzle body
13 Spray nozzle spray hole
14,15 Nozzle insertion hole
19 Slide ring
20 Mother pipe fixed inclined ring
21 Presser bracket
22, 22a, 22b Tolerance setting bolt
23 Tolerance setting ring
24 Mother pipe fixing ring
25 cylinder
26 End plate
27 Tip of protective cylinder
28 Drain drain plug
30 insertion hole
31 slit
32 Bore for adjusting inner diameter
33 Clearance adjustment plate
34 Slit
35 Double nut
36 recess

Claims (4)

A pair of nozzle insertion holes facing the peripheral wall of the temperature reducing device mother pipe through which high-temperature steam flows are formed, and a spray nozzle or a spray nozzle and a protective cylinder provided so as to surround the spray nozzle are inserted from one nozzle insertion hole. The cylindrical body in which the tip of the spray nozzle or the tip of the protective cylinder is passed through the other nozzle insertion hole and protrudes outward from the temperature reducing device mother pipe, and the protruding tip is attached to the peripheral wall of the temperature reducing device mother pipe And a temperature reducing device surrounded by an end plate that closes the opening of the cylindrical body,
A temperature-reducing device characterized in that tip support means connected to the peripheral wall of the temperature-reducing device mother pipe is provided inside the cylinder and at a position away from the cylinder and the end plate. 2. The temperature reducing device according to claim 1, wherein the tip supporting means has a bolt, and the dimensional tolerance of the tip supporting means with respect to the tip protruding from the temperature reducing device main tube can be adjusted by tightening the bolt. It is comprised so that the temperature reduction apparatus characterized by the above-mentioned. 2. The temperature reducing device according to claim 1, wherein the tip supporting means is interposed between a mother tube fixing inclined ring fixed to a peripheral wall of the temperature reducing device mother pipe, and between the mother tube fixing inclined ring and the tip portion. A temperature reducing device comprising: a slide ring that is formed, a pressing metal that holds the slide ring, and a bolt that is screwed into the mother pipe fixing inclined ring via the pressing metal. 2. The temperature reducing apparatus according to claim 1, wherein the tip support means is a mother pipe fixing ring fixed to a peripheral wall of the temperature reducing apparatus mother pipe, and is screwed from the outer peripheral surface to the inner peripheral surface of the mother pipe fixing ring. A temperature reducing device comprising a plurality of bolts and a ring pressed against the tip by the bolts.

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