Boiler apparatus and method for supporting penthouse of boiler apparatus

Abstract

To provide a boiler device capable of reducing the total number of a handing rod disposed between a steel frame and a penthouse.SOLUTION: A boiler device 1 is equipped with a furnace 2 that burns fuel, heat exchangers 7, 8, and 9 disposed in a combustion gas passage 3 in which combustion gas generated in the furnace 2 flows, and a penthouse 4 provided in the furnace 2 and the ceiling portion 3a of the combustion gas passage 3. Each heat exchanger 7, 8, 9 is hung from the steel frame 5 through a hanging rod 13 penetrating the penthouse 4. A sleeve 14 is welded on an outer peripheral surface of the handing rod 13 hanging the heat exchangers 7, 8, and 9. By welding a supporting member 15 on the outer peripheral surface of the sleeve 14 at the side, a ceiling frame 16 and a ceiling casing 18 composing a ceiling wall 12 of the penthouse 4 are supported by a supporting member 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a boiler apparatus in which a penthouse is provided in the ceiling of a furnace and a combustion gas passage, and to a penthouse supporting method for such a boiler apparatus. [Background technology]

[0002] In a boiler system, a furnace that burns fuel is installed vertically, and a flue is connected above the furnace. The flue has a combustion gas passage inside, and a heat exchanger consisting of a superheater, a coal economizer, etc. is disposed in the combustion gas passage. Then, the combustion gas generated in the furnace flows through the combustion gas passage, heating the boiler feed water flowing through the heat exchanger to generate steam.

[0003] In this type of boiler system, a ceiling chamber called a penthouse is provided in the ceiling of the furnace and the combustion gas passage, and the ceiling wall of the penthouse is supported by being suspended from a steel frame by a plurality of suspension rods. A suspended heat exchanger is disposed in the combustion gas passage, and the upper part of the heat transfer tube constituting the heat exchanger is disposed in the penthouse, penetrating the ceiling of the combustion gas passage. A plurality of headers connected to the upper ends of the heat transfer tubes, a manifold to which a plurality of headers are connected, and the heat exchanger including these headers and manifolds is suspended from the steel frame via a plurality of suspension rods penetrating the ceiling wall of the penthouse (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-223303 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional boiler equipment, there are multiple penthouse suspension rods between the steel frame and the penthouse to support the penthouse, and multiple heat exchanger suspension rods to suspend the headers and manifolds, which means that the total number of suspension rods required is very large, which leads to increased costs. In addition, there is also the issue of reduced maintainability, as the passage and work space above the penthouse is narrowed by the large number of suspension rods.

[0006] The present invention has been made in light of the current state of the prior art, and its object is to provide a boiler apparatus that can reduce the total number of suspension rods placed between the steel frame and the penthouse. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a representative embodiment of the present invention is a boiler apparatus comprising a furnace that burns fuel, a heat exchanger arranged in a combustion gas passage through which combustion gas generated in the furnace flows, and a penthouse provided in the ceiling of the furnace and the combustion gas passage, in which the heat exchanger is suspended from a steel frame via a suspension rod that penetrates the penthouse, characterized in that the boiler apparatus comprises a sleeve that is inserted into the suspension rod and welded to the outer peripheral surface of the suspension rod, and a support member that is welded to the outer peripheral surface of the sleeve and extends in a direction perpendicular to the axial direction of the suspension rod, and the penthouse is supported by the support member. Effect of the Invention

[0008] According to the boiler apparatus of the present invention, the total number of suspension rods arranged between the steel frame and the penthouse can be reduced. Note that the problems, configurations and effects other than those described above will become clear from the following description of the embodiments. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall configuration diagram of a boiler apparatus according to an embodiment; [Diagram 2]FIG. 2 is a cross-sectional view of a penthouse support structure provided in the boiler apparatus of FIG. 1. [Diagram 3] FIG. 2 is a plan view of the penthouse support structure. [Figure 4] FIG. 2 is a perspective view of the penthouse support structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0011] Fig. 1 is an overall configuration diagram of a boiler apparatus according to an embodiment. As shown in Fig. 1, the boiler apparatus 1 according to this embodiment includes a furnace 2 that burns fuel, a combustion gas passage 3 that is a passage for combustion gas generated in the furnace 2, and a penthouse 4 provided on a ceiling portion 3a of the furnace 2 and the combustion gas passage 3. The furnace 2 and the combustion gas passage 3 are suspended from a beam portion 5a of a steel frame 5 by a suspension rod and a suspension beam (not shown).

[0012] A primary superheater 6, a secondary superheater 7, a tertiary superheater 8, and a reheater 9 are installed in the combustion gas passage 3 connected to the upper part of the furnace 2 as heat exchangers for recovering heat from the combustion gas. The primary superheater 6 installed on the rear side of the combustion gas passage 3 is a horizontal-type heat exchanger with a horizontal heat transfer surface. On the other hand, the secondary superheater 7, the tertiary superheater 8, and the reheater 9 installed on the front side of the combustion gas passage 3 are suspended-type heat exchangers with vertical heat transfer surfaces.

[0013] In the boiler apparatus 1 configured as above, the furnace 2 and the ceiling portion 3a of the combustion gas passage 3 are manufactured by alternately connecting a plurality of heat transfer tubes. The upper portion of the heat transfer tube group constituting the superheaters 7, 8 and the reheater 9, which are suspended type heat exchangers, and the header 10 and the manifold 11 connected to these heat transfer tube groups are arranged in the penthouse 4 provided on the upper portion of the ceiling portion 3a. The suspended type heat exchangers (superheaters 7, 8, reheater 9) including the header 10 and the manifold 11 are suspended from the beam portion 5a of the steel frame 5 via a plurality of suspension rods 13 penetrating the ceiling wall 12 of the penthouse 4, and the penthouse 4 is supported by the steel frame 5 using these suspension rods 13 as described below.

[0014] FIG. 2 is a cross-sectional view of the penthouse support structure, FIG. 3 is a plan view of the penthouse support structure, and FIG. 4 is a perspective view of the penthouse support structure.

[0015] As shown in Figs. 2 to 4, a cylindrical sleeve 14 is inserted in the middle of the hanging rod 13 that hangs the heat exchanger, and this sleeve 14 is welded to the outer circumferential surface of the hanging rod 13. A pair of rectangular support members 15 are welded to the outer circumferential surface of the sleeve 14, and these support members 15 extend in a direction perpendicular to the axial direction of the hanging rod 13. A ceiling frame 16 made of a channel steel (C channel) is placed on each support member 15. The ceiling frame 16 extends in a direction intersecting the long axis of the support member 15, and a plurality of ceiling frames 16 are arranged at predetermined intervals in a direction perpendicular to the support member 15. A connecting member 17 made of a channel steel is welded to the lower surface of the ceiling frame 16. The connecting member 17 extends in the same direction as the support members 15, and the connecting member 17 prevents the distance between the facing ceiling frames 16 from changing. A plate-shaped ceiling casing 18 is placed on the ceiling frame 16, and the ceiling frame 16, the connecting members 17 and the ceiling casing 18 form the ceiling wall 12 of the penthouse 4 described above.

[0016] The upper end of the hanging rod 13 is connected to the beam portion 5a of the steel frame 5, and the hanging rod 13 penetrates the ceiling casing 18 of the ceiling wall 12 and reaches the inside of the penthouse 4. Although not shown in FIG. 4, a rainproof umbrella member 19 that closes the penetration part (gap) between the ceiling casing 18 and the hanging rod 13 is attached to the hanging rod 13 protruding above the ceiling casing 18. The umbrella member 19 is made of a steel material processed into a cap shape, and is welded to the outer circumferential surface of the sleeve 14 with its upper surface inserted into the hanging rod 13. As shown in FIG. 2, the steel frame 5 has a beam member 20 made of H-shaped steel below the beam portion 5a, and a heat-insulating material (not shown) is arranged between a holding plate 21 placed on the beam member 20 and the upper surface of the ceiling casing 18.

[0017] The hanging rod 13 is made of a spring bolt (Φ80-90) made of low alloy steel with high high-temperature strength, and the sleeve 14 welded to the hanging rod 13 is made of a carbon steel pipe material (outer diameter Φ90-110, length about 400 mm). The support member 15 welded to the sleeve 14 is made of a carbon steel plate material (height 100-150 mm, thickness about 12 mm). Here, the hanging rod 13 and the sleeve 14 are welded in advance in a factory and subjected to heat treatment (quenching and tempering), and then assembled to the boiler apparatus 1 on-site. That is, in the boiler apparatus 1 according to this embodiment, heat exchangers such as the superheaters 7, 8 and the reheater 9 are suspended from the beams 5a of the steel frame 5 by using the heat-treated hanging rod 13.

[0018] When the boiler unit 1 is newly installed on site, the heat exchanger is suspended from the beams 5a of the steel frame 5 by the suspension rod 13 to which the sleeve 14 is welded, and then the support member 15 is welded to the outer circumferential surface of the sleeve 14. Thereafter, the ceiling frame 16 is placed on the support member 15, and the connecting member 17 is welded to the underside of the ceiling frame 16, and the ceiling casing 18 is placed on the ceiling frame 16 to support the ceiling wall 12 of the penthouse 4. Thereafter, in order to close the penetration portion between the ceiling casing 18 and the suspension rod 13, an umbrella member 19 is welded to the outer circumferential surface of the sleeve 14 protruding above the ceiling frame 16.

[0019] Here, the suspension rod 13 and the sleeve 14 are heat-treated after welding at the factory, and since the support member 15 is welded to the outer circumferential surface of such sleeve 14 on-site, the thermal stress generated when welding the support member 15 is absorbed by the sleeve 14. Therefore, the material properties of the suspension rod 13 are not deteriorated by the heat generated when welding the support member 15, and the support member 15 can be easily welded to the sleeve 14. In addition, since the umbrella member 19 is also welded to the outer circumferential surface of the sleeve 14 on-site, the material properties of the suspension rod 13 are not deteriorated by the heat generated when welding the umbrella member 19, and the umbrella member 19 can be easily welded to the sleeve 14.

[0020] As described above, in the boiler device 1 according to this embodiment, the sleeve 14 is welded in advance to the outer peripheral surface of the suspension rod 13 that suspends the heat exchanger (superheater 7, 8 and reheater 9) from the beam portion 5a of the steel frame 5, and the support member 15 is welded to the outer peripheral surface of the sleeve 14 on-site, so that the ceiling frame 16 and the ceiling casing 18 that constitute the ceiling wall 12 of the penthouse 4 are supported by the support member 15. Therefore, the ceiling wall 12 of the penthouse 4 can be suspended from the beam portion 5a of the steel frame 5 using the suspension rod 13 for suspending the heat exchanger. As a result, the total number of suspension rods 13 arranged between the beam portion 5a of the steel frame 5 and the ceiling wall 12 of the penthouse 4 can be significantly reduced, and the cost can be reduced by reducing the number of parts. In addition, since the total number of suspension rods 13 arranged between the steel frame 5 and the ceiling wall 12 is reduced, the passage space required for workers above the penthouse 4 is widened, improving maintainability and facilitating regular inspection work.

[0021] In addition, in the boiler apparatus 1 according to this embodiment, the suspension rod 13 and the sleeve 14 are welded and heat treated in advance at a factory, and when the boiler apparatus 1 is newly constructed on site, the heat exchanger is suspended from the beam portion 5a of the steel frame 5 by the suspension rod 13 to which the sleeve 14 is welded, and then the support member 15 is welded to the outer circumferential surface of the sleeve 14, and the ceiling wall 12 of the penthouse 4 is placed on the support member 15, so that the thermal stress generated when the support member 15 is welded to the sleeve 14 does not directly act on the suspension rod 13. Therefore, the support member 15 can be easily welded to the sleeve 14 without worrying about deterioration of the characteristics of the suspension rod 13, and the construction period for the new construction of the boiler apparatus 1 can be shortened.

[0022] In addition, in the boiler apparatus 1 according to this embodiment, a rainproofing umbrella member 19 is attached to the hanging rod 13 protruding upward from the ceiling wall 12 of the penthouse 4, and the umbrella member 19 closes the penetration between the ceiling casing 18 and the hanging rod 13, thereby preventing rain from entering the penthouse 4. At this time, the umbrella member 19 is attached to the hanging rod 13 via the sleeve 14, and as described above, since the hanging rod 13 and the sleeve 14 have already been heat-treated in the factory, the umbrella member 19 can be easily welded to the sleeve 14 on-site. In other words, not only the support member 15, which is a supporting part of the penthouse 4, but also the umbrella member 19, which is a rainproofing part, is structured to be weldable, so that the construction period for the new construction of the boiler apparatus 1 can be shortened from this point of view.

[0023] Furthermore, in the boiler apparatus 1 according to this embodiment, the sleeve 14 welded to the hanging rod 13 is exposed to high temperatures (e.g., 427°C) inside the penthouse 4, whereas the hanging rod 13 above the sleeve 14 is exposed to room temperature above the penthouse 4, resulting in a difference in the elongation rate between the hanging rod 13 and the sleeve 14. However, since only the upper end of the sleeve 14 is welded to the hanging rod 13 and the lower end of the sleeve 14 is not welded to the hanging rod 13, the difference in the elongation rate between the hanging rod 13 and the sleeve 14 can be absorbed.

[0024] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiment shows a preferred example, but a person skilled in the art can implement various alternatives, modifications, variations, or improvements based on the contents disclosed in this specification, and these are included in the technical scope described in the attached claims. [Explanation of symbols]

[0025] 1. Boiler equipment 2 Furnace 3 Combustion gas passage 3a Ceiling section 4. Penthouse 5. Steel Frame 5a Beam section 6 Primary superheater 7 Secondary superheater (heat exchanger) 8 Tertiary superheater (heat exchanger) 9 Reheater (heat exchanger) 10 Kanyose 11 Manifold 12 Ceiling Wall 13 Hanging rod 14 Sleeve 15 Support material 16 Ceiling Frame 17 Connecting members 18 Ceiling casing 19 Umbrella parts 20 Beam member 21 Holding plate

Claims

1. A boiler apparatus comprising: a furnace that burns fuel; a heat exchanger disposed in a combustion gas passage through which combustion gas generated in the furnace flows; and a penthouse provided on a ceiling of the furnace and the combustion gas passage, the heat exchanger being suspended from a steel frame via a suspension rod penetrating the penthouse, a sleeve inserted into the hanging rod and welded to an outer circumferential surface of the hanging rod; and a support member welded to the outer circumferential surface of the sleeve and extending in a direction perpendicular to an axial direction of the hanging rod, The penthouse is supported by the support member, A rainproofing member is provided on a ceiling wall of the penthouse, and the rainproofing member is welded to an outer peripheral surface of the sleeve protruding upward from the ceiling wall of the penthouse, a folded portion folded upward is formed on a periphery of the through hole in the ceiling wall through which the sleeve passes, the umbrella member is formed in a cap shape having a top surface through which the sleeve passes and a peripheral wall extending downward from a peripheral edge of the top surface, The upper end of the folded portion is located above the lower end of the peripheral wall. A boiler apparatus comprising:

2. In the boiler apparatus according to claim 1, A boiler apparatus characterized in that only an upper end portion of the sleeve is welded to the suspension rod.

3. The present invention is applied to a boiler apparatus including a furnace that burns fuel, a heat exchanger disposed in a combustion gas passage through which combustion gas generated in the furnace flows, and a penthouse provided on a ceiling of the furnace and the combustion gas passage, the heat exchanger being suspended from a steel frame via a suspension rod penetrating the penthouse, a step of inserting a sleeve into the hanging rod before the hanging rod is connected to the steel frame, welding the sleeve to the hanging rod, and then heat treating the hanging rod and the sleeve; a step of connecting the suspension rod after the heat treatment to the steel frame to suspend the heat exchanger; a step of welding a support member extending in a direction perpendicular to the axial direction of the suspension rod to an outer peripheral surface of the sleeve, and placing a ceiling wall of the penthouse on the support member; a step of welding an umbrella member to an outer peripheral surface of the sleeve protruding upward from the ceiling wall of the penthouse, thereby providing an umbrella member for rainproofing on the ceiling wall of the penthouse; Including, a folded portion folded upward is formed on a periphery of the through hole in the ceiling wall through which the sleeve passes, the umbrella member is formed in a cap shape having a top surface through which the sleeve passes and a peripheral wall extending downward from a peripheral edge of the top surface, In the step of disposing the umbrella member, the umbrella member is welded to the outer circumferential surface of the sleeve such that an upper end of the folded portion is positioned above a lower end of the peripheral wall. A method for supporting a penthouse in a boiler unit.

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