Ultra-supercritical W-type flame boiler furnace rigid beam system

Abstract

The present invention discloses a rigid beam system for the furnace of an ultra-supercritical W-shaped flame boiler, comprising four first rigid beams arranged around the outer periphery of the octagonal furnace and four oblique beams arranged at the oblique corners of the octagonal furnace. Each oblique beam comprises a trapezoidal member and two rectangular members arranged at either end of the trapezoidal member, the long sides of the two rectangular members coinciding with the waist sides of the trapezoidal member. Each rectangular member of each oblique beam is connected to two adjacent first rigid beams via a first connecting plate and a second connecting plate, respectively. The first and second connecting plates are arranged in parallel and extend in directions away from each other. The rigid beam system of the present invention can provide sufficient rigidity for the furnace and ensure the free expansion of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler combustion, and more particularly to a furnace rigid beam system of an ultra-supercritical W-shaped flame boiler. Background Art

[0002] The boiler buckstay is an essential component of the boiler. Its function is to withstand the boiler furnace pressure and provide effective lateral support for the tubes, thereby ensuring that the tubes have sufficient strength; keep the tubes within the allowable range and prevent excessive displacement of the tube walls; prevent tube wall vibration; together with the anti-sway device, determine the expansion center of the boiler; withstand earthquakes, wind loads, and unbalanced forces, and transmit the earthquake and wind loads of the boiler and the unbalanced forces of the tail flue to the boiler supporting steel structure through the anti-sway device.

[0003] In general, subcritical, supercritical, and ultra-supercritical boilers, the furnace and enclosure walls are all quadrilateral structures, and the layout of the rigid beams is relatively regular. However, for ultra-supercritical "W" flame boilers, due to the performance requirements of the boiler, part of the tube group below the furnace shoulder is an octagonal structure. In order to adapt to the layout of the boiler tube group, it is urgent to design a special rigid system to transmit the internal pressure of the furnace and provide sufficient rigidity for the furnace tube group. Summary of the Invention

[0004] An object of the present invention is to provide a supercritical W-type flame boiler furnace rigid beam system, which is provided with a special corner structure at the octagonal furnace angle and a bottom rigid beam and other structures arranged under the furnace cold ash hopper to provide sufficient rigidity for the supercritical "W" flame boiler furnace.

[0005] In order to achieve these purposes and other advantages according to the present invention, according to one aspect of the present invention, the present invention provides a ultra-supercritical W-type flame boiler furnace rigid beam system, the lower part of the furnace is an octagonal furnace with an octagonal structure, a cold ash hopper is provided at the bottom of the furnace, and the outer periphery of the furnace is evenly distributed with tube groups, which include four first rigid beams arranged around the outer periphery of the octagonal furnace and four inclined beams arranged at the oblique corners of the octagonal furnace, each inclined beam includes a trapezoidal member and two rectangular members arranged at both ends of the trapezoidal member, the long sides of the two rectangular members coincide with the waist sides of the trapezoidal member, and any rectangular member of each inclined beam is connected to two adjacent first rigid beams through a first connecting plate and a second connecting plate, respectively, and the first connecting plate and the second connecting plate are arranged in parallel and extend in directions away from each other.

[0006] Preferably, the tube group is perpendicular to the oblique beam, a flange is provided on the edge of each oblique beam, each oblique beam is connected to the tube group through a plurality of lugs, each lug is fixedly connected to the tube group and movably overlapped on the flange of the oblique beam through a hook.

[0007] Preferably, an inner flange is provided on the inner edge of each first rigid beam, and a plurality of vertical plates are provided between the parallel adjacent first connecting plates and the first rigid beam, one end of the plurality of vertical plates is vertically fixedly connected to the first connecting plate, and the other end is movably overlapped on the inner flange of the first rigid beam through a bent hook.

[0008] Preferably, a third connecting plate is connected in parallel to the outer side of each first connecting plate, and the third connecting plate is vertically connected to the tube group.

[0009] Preferably, it also includes: a cold ash hopper rigid beam assembly, which is arranged on the periphery of the cold ash hopper, and includes an upper rigid beam, an oblique truss, and a bottom rigid beam from top to bottom. Guard plates are installed on the outside of the oblique truss and the bottom rigid beam, and insulation material is provided on the inside of the guard plates. A lug plate is provided on the top of the guard plate, and the top of the lug plate is connected to the pipe group. The bottom rigid beam is vertically connected to the guard plate, including a front wall truss, a rear wall truss, and side wall rigid beams on both sides. Both ends of the two side wall rigid beams are connected to the front wall truss and the rear wall truss through side wall connecting plates.

[0010] Preferably, two pins are connected between the guard plate and the ear plate.

[0011] Preferably, each side wall rigid beam is connected to the side wall connecting plate through a connecting piece, and the connecting piece includes connecting plate one, connecting plate two, connecting plate three and connecting plate four connected in sequence, and a filling plate is arranged between adjacent pipes of the pipe group. The side wall connecting plate is located on the outside of the pipe group, one end of the connecting plate two passes through the side wall connecting plate and is connected to connecting plate one through the filling plate, and the other end is connected to connecting plate three, the connecting plate three and connecting plate four are hinged, and the end of the connecting plate four is hinged to the side wall rigid beam.

[0012] The present invention has at least the following beneficial effects:

[0013] First, the present invention designs a special corner structure for the ultra-supercritical octagonal furnace rigid beam, which can effectively transmit force while ensuring that the boiler body tube group can expand freely;

[0014] Second, the present invention combines the cold ash hopper insulation design and the suspension of the integral guard plate to design a cold ash hopper rigid beam assembly to meet the requirements of the cold ash hopper pressure transfer and the smooth transfer of the weight of the integral guard plate and insulation material, and to ensure the free expansion of components such as the pipe group and the rigid beam;

[0015] Third, the present invention designs a side wall connecting plate structure for the bottom rigid beam of the cold ash hopper rigid beam assembly to transmit the reaction force transmitted from the front and rear wall rigid beams. At the same time, it designs a connecting plate-filling plate structure to withstand the side wall furnace pressure load.

[0016] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A side view of the overall arrangement of the rigid beam system of the ultra-supercritical W-shaped flame boiler furnace of the present invention;

[0018] Figure 2 This is a front view of the overall arrangement of the ultra-supercritical W-shaped flame boiler furnace rigid beam system of the present invention;

[0019] Figure 3 This is a side view of the lower part of the furnace of the ultra-supercritical "W" flame boiler of the present invention;

[0020] Figure 4 This is a front view of the lower part of the furnace of the ultra-supercritical "W" flame boiler of the present invention;

[0021] Figure 5 It is a horizontal cross-sectional view of the rigid beam of the octagonal furnace of the present invention;

[0022] Figure 6 This is a schematic diagram of the rigid beam structure at the corner of the octagonal furnace in the present invention;

[0023] Figure 7 This is a schematic structural diagram of the rigid beam assembly of the cold ash hopper in the present invention;

[0024] Figure 8 The front and rear views of the cold ash hopper rigid beam assembly of the present invention;

[0025] Figure 9 This is a schematic diagram of the rigid beam structure at the corner of the octagonal furnace ash hopper in the present invention;

[0026] Figure 10 Schematic diagram of the structure of the third rigid beam assembly in the present invention;

[0027] Figure 11 Schematic diagram of the structure of the connecting piece in the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0029] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0030] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] In one of the technical solutions, Figures 1 to 11 As shown, the present invention provides a supercritical W-type flame boiler furnace rigid beam system, the lower part of the furnace is an octagonal furnace 100 with an octagonal structure, a cold ash hopper 200 is provided at the bottom of the furnace, and the outer periphery of the furnace is evenly distributed with a tube group 300, which includes four first rigid beams 101 arranged around the outer periphery of the octagonal furnace 100 and four inclined beams 102 arranged at the oblique corners of the octagonal furnace 100, each inclined beam 102 includes a trapezoidal member and two rectangular members arranged at both ends of the trapezoidal member, the long sides of the two rectangular members are connected to the waist sides of the trapezoidal member, and any rectangular member of each inclined beam 102 is connected to two adjacent first rigid beams 101 through a first connecting plate 103 and a second connecting plate 104, respectively, and the first connecting plate 103 and the second connecting plate 104 are arranged in parallel and extend in directions away from each other.

[0032] In this technical solution, there are pressures in the furnace in both positive and negative directions perpendicular to the tubes in the tube group 300 at the oblique angle. These internal pressures require a rigid beam system to withstand. An oblique beam 102 is arranged along the tube group 300 at the oblique angle. The oblique beam 102 is a special-shaped I-beam with a uniform cross-section in the middle and a higher cross-section with only a web at both ends. The two ends of the oblique beam 102 are respectively welded to the two first connecting plates 103. When negative pressure is generated in the furnace, the negative pressure is transmitted to the ear plate 105 through the tube group 300, and then transmitted to the oblique beam 102 by the ear plate 105; when positive pressure is generated in the furnace, the tube group 300 directly applies pressure to the oblique beam 102. The component of the reaction force at the end of inclined beam 102 that is parallel to the first connecting plate 103 is directly transmitted to the first connecting plate 103. The component of the reaction force perpendicular to the first connecting plate 103 is transmitted through the vertical plate 106 to the first rigid beam 101, then to the second connecting plate 104, and finally to the first connecting plate 103 through the end of inclined beam 102. The positive and negative furnace pressure loads on the rest of the tube bank 300 follow the same design principles as conventional rigid beams: the force is transmitted to the rigid beam through the retaining ring and vertical plate. At the rigid beam end, it is transmitted through the second connecting plate 104 to the end of inclined beam 102, and then to the first connecting plate 103. There, the force is combined with the load transmitted from inclined beam 102 and transmitted to the third connecting plate 107. If the forces transmitted from both ends of the third connecting plate 107 are equal, they are fully borne by the third connecting plate 107. If the forces transmitted from both ends of the third connecting plate 107 are unequal, the difference is ultimately transmitted to the tube bank 300. The present invention designs a special corner structure for the ultra-supercritical octagonal furnace rigid beam, which can effectively transmit force while ensuring that the boiler body tube group can expand freely, and provides sufficient rigidity for the octagonal furnace 100.

[0033] In another technical solution, Figures 1 to 11 As shown, the tube assembly 300 is perpendicular to the inclined beam 102. Each inclined beam 102 is provided with a flange at its edge. Each inclined beam 102 is connected to the tube assembly 300 via multiple lugs 105. Each lug 105 is fixedly connected to the tube assembly 300 and flexibly overlaps the flange of the inclined beam 102 via a hook. In this technical solution, the inclined beam 102 is connected to the tube assembly 300 via the lugs 105. The lugs 105 are welded to the tubes and hooked onto the flange of the inclined beam 102 via a hook, but are not welded to the flange of the inclined beam 102. Due to different materials and temperatures, the inclined beam 102 and the tube assembly 300 expand at different speeds. The tube assembly 300 can slide along the inclined beam 102 to ensure free expansion of the tube assembly 300.

[0034] In another technical solution, Figures 1 to 11As shown, the inner edge of each first rigid beam 101 is provided with an inner flange, and a plurality of vertical plates 106 are provided between adjacent parallel first connecting plates 103 and the first rigid beams 101. One end of each vertical plate 106 is vertically fixedly connected to the first connecting plate 103, and the other end is movably overlapped on the inner flange of the first rigid beam 101 via a hook. In this technical solution, the vertical plates 106 are welded to the first connecting plates 103 and hung on the inner flange of the first rigid beam 101 via a hook. The first rigid beam 101 is in a cold state, and the first connecting plates 103 are in a hot state. The connection between the two can slide to ensure the free expansion of the relevant components.

[0035] In another technical solution, Figures 1 to 11 As shown, a third connecting plate 107 is also connected in parallel to the outer side of each first connecting plate 103. The third connecting plate 107 is perpendicularly connected to the tube group 300. In this technical solution, the first connecting plate 103 and the third connecting plate 107 are welded together to transmit force to the third connecting plate 107. For a symmetrical structure, the force transmitted from the third connecting plate 107 in both directions is equal. For an asymmetric structure, the forces in the two directions are unequal and need to be transmitted to the tube group 300 through the anchor point between the tube group 300 and the tube group 300. Ultimately, the difference in the force transmitted from the two directions is borne by the tube group 300.

[0036] In another technical solution, Figures 1 to 11As shown, it also includes: a cold ash hopper rigid beam assembly, which is arranged at the periphery of the cold ash hopper 200, and includes an upper rigid beam 201, an oblique truss 202, and a bottom rigid beam 203 from top to bottom. A guard plate 204 is installed on the outer side of the oblique truss 202 and the bottom rigid beam 203, and an insulation material is provided on the inner side of the guard plate 204. A lug plate 205 is provided on the top of the guard plate 204, and the top of the lug plate 205 is connected to the pipe group 300. The bottom rigid beam 203 is vertically connected to the guard plate 204, including a front wall truss 210, a rear wall truss 211, and side wall rigid beams 212 on both sides. Both ends of the two side wall rigid beams 212 are connected to the front wall truss 210 and the rear wall truss 211 through a side wall connecting plate 213. In this technical solution, at the cold ash hopper 200, the rigid beam system not only bears the positive and negative pressure loads transmitted from the pipe group 300, but also the weight of the front and rear wall pipe groups 300 and the weight of the ash residue in the cold ash hopper 200. The positive and negative pressure loads, the weight of the front and rear wall pipe groups 300, and the ash residue load are transmitted by the installation of multiple diagonal trusses 202. The end reaction forces of the diagonal trusses 202 are transmitted to the bottom rigid beam 203 and the upper rigid beam 201, and then borne by the bottom rigid beam 203 and the upper rigid beam 201. Because the bottom rigid beam 203 cannot be configured to expand with the pipe group 300, a protective plate 204 is arranged on the outside to enclose the diagonal trusses 202 and the bottom rigid beam 203 in an insulating range, allowing the diagonal truss 202 and bottom rigid beam 203 system to expand with the pipe group 300. The insulation material, protective panels 204, and bottom rigid beams 203, along with their own weight, are suspended from the pipe groups 300 on the front and rear walls via lugs 205. The reaction force from the diagonal trusses 202 acting directly on the bottom rigid beams 203 at the furnace cold ash hopper 200 is borne by the front and rear wall trusses, which then transmit the reaction force to the side wall connecting plates 213. This effectively transmits force while ensuring free expansion of the structure.

[0037] In another technical solution, Figures 1 to 11 As shown, two pins 206 are connected between the guard plate 204 and the lug plate 205. In this technical solution, since the expansion of the guard plate 204 and the tube group 300 may be inconsistent, two pins 206 are provided to connect the guard plate 204 and the lug plate 205 to ensure the free expansion of the structure.

[0038] In another technical solution, Figures 1 to 11As shown, each side wall rigid beam 212 is connected to the side wall connecting plate 213 through a connecting member, and the connecting member includes connecting plate one 214, connecting plate two 215, connecting plate three 216 and connecting plate four 217 connected in sequence. A filling plate 218 is set between adjacent tube groups of the tube group 300. The side wall connecting plate 213 is located on the outside of the tube group 300. One end of the connecting plate two 215 passes through the side wall connecting plate 213 and is connected to the connecting plate one 214 through the filling plate 218, and the other end is connected to the connecting plate three 216. The connecting plate three 216 and the connecting plate four 217 are hinged, and the end of the connecting plate four 217 is hinged to the side wall rigid beam 212. In this technical solution, the reaction force of the side wall rigid beam 212 needs to be transmitted through the connecting parts, that is, it is transmitted to the connecting plate three 216 through the connecting plate four 217, and then transmitted to the connecting plate two 215. A filling plate 218 is set on the pipe group 300. The force of the connecting plate two 215 is transmitted to the connecting plate one 214 through the filling plate 218. The connecting plate one 214 is welded to the pipe groups 300 of the front and rear walls. The side wall reaction force is finally transmitted to the pipe groups 300 of the front and rear walls, ensuring the effective force transmission of the structure.

[0039] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. Ultra-supercritical W-shaped flame boiler furnace rigid beam system, the lower part of the furnace is an octagonal furnace with an octagonal structure, the bottom of the furnace is provided with a cold ash hopper, the outer periphery of the furnace is uniformly distributed with tube groups, characterized in that: The invention comprises four first rigid beams arranged around the outer periphery of the octagonal furnace and four oblique beams arranged at the oblique corners of the octagonal furnace, each oblique beam comprising a trapezoidal member and two rectangular members arranged at both ends of the trapezoidal member, the long sides of the two rectangular members being connected to the waist sides of the trapezoidal member, and any rectangular member of each oblique beam being connected to two adjacent first rigid beams via a first connecting plate and a second connecting plate, respectively, the first connecting plate and the second connecting plate being arranged in parallel and extending in directions away from each other; It also includes: a cold ash hopper rigid beam assembly, which is arranged at the periphery of the cold ash hopper, and includes an upper rigid beam, an oblique truss, and a bottom rigid beam from top to bottom. Guard plates are installed on the outside of the oblique truss and the bottom rigid beam, and insulation material is provided on the inside of the guard plates. A lug plate is provided on the top of the guard plate, and the top of the lug plate is connected to the pipe group. The bottom rigid beam is vertically connected to the guard plate, including a front wall truss, a rear wall truss, and side wall rigid beams on both sides. Both ends of the two side wall rigid beams are connected to the front wall truss and the rear wall truss through side wall connecting plates.

2. The ultra-supercritical W-shaped flame boiler furnace rigid beam system according to claim 1, characterized in that: The tube group is perpendicular to the oblique beam, and a flange is provided on the edge of each oblique beam. Each oblique beam is connected to the tube group through a plurality of lugs. Each lug is fixedly connected to the tube group and movably overlapped on the flange of the oblique beam through a hook.

3. The ultra-supercritical W-shaped flame boiler furnace rigid beam system according to claim 2, characterized in that: An inner flange is provided on the inner edge of each first rigid beam, and multiple vertical plates are provided between the parallel adjacent first connecting plates and the first rigid beam. One end of the multiple vertical plates is vertically fixedly connected to the first connecting plate, and the other end is movably overlapped on the inner flange of the first rigid beam through a bent hook.

4. The ultra-supercritical W-shaped flame boiler furnace rigid beam system according to claim 3, characterized in that: A third connecting plate is connected in parallel to the outer side of each first connecting plate, and the third connecting plate is vertically connected to the tube group.

5. The ultra-supercritical W-shaped flame boiler furnace rigid beam system according to claim 1, characterized in that: Two pins are connected between the guard plate and the ear plate.

6. The ultra-supercritical W-shaped flame boiler furnace rigid beam system according to claim 1, characterized in that: Each side wall rigid beam is connected to the side wall connecting plate through a connecting piece, and the connecting piece includes connecting plate one, connecting plate two, connecting plate three and connecting plate four connected in sequence. Filling plates are arranged between adjacent pipes of the pipe group. The side wall connecting plate is located on the outside of the pipe group. One end of the connecting plate two passes through the side wall connecting plate and is connected to connecting plate one through the filling plate, and the other end is connected to connecting plate three. The connecting plate three and connecting plate four are hinged, and the end of the connecting plate four is hinged to the side wall rigid beam.

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