A furnace outer tube hanging structure of a high-temperature heat surface of a gas turbine waste heat boiler

Abstract

This utility model discloses an external pipe suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler, including multiple top suspension beams fixed above the boiler body. Each of the top suspension beams is connected to a base plate via fasteners. Corresponding sleeve connection holes are provided on the base plates for connecting pre-embedded sleeves. Main connecting plates for the suspension device are fixedly installed on the base plates between the sleeves and the top suspension beams on both sides. This utility model adopts a freely sliding external suspension structure, resulting in a lower external temperature. The suspension device can be made of lower-specification materials and thinner steel plates. It completely avoids the risk of flue gas leakage caused by the suspension device passing through insulation. The oval hole structure on the bottom plate of the suspension plate solves the problem of excessive thermal stress caused by the expansion of the header along its length. This structure simplifies manufacturing and maintenance. The frame structure of the suspension beams enhances the stability of the suspension system and reduces the impact of various operating conditions of the peak-shaving unit on the hot surface.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine waste heat boiler technology, and in particular to an external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler. Background Technology

[0002] Waste heat boilers from gas turbines are core equipment in combined cycle gas turbine-steam power plants. The highest-level waste heat boilers from gas turbines need to recover waste heat from flue gas and generate electricity efficiently under high temperature and high pressure conditions (steam pressure > 17 MPa and flue gas temperature > 690℃). With the frequent start-ups and shutdowns and wide-load operation of peak-shaving units, their final high-temperature hot surfaces (such as high-pressure superheaters and reheaters) need to withstand severe thermal stress shocks, which places stringent requirements on the safety and reliability of the heating surface suspension structure.

[0003] Under high-temperature and high-pressure operating conditions, traditional suspension structures with rods / plates exhibit significant drawbacks: the allowable stress attenuation of materials in high-temperature areas is substantial, leading to difficulties in material selection and excessively large structural dimensions; rods / plates penetrating the insulation layer easily cause flue gas leakage; ordinary alloy materials are prone to high-temperature creep after long-term operation, resulting in tube screen misalignment; rigid supports are difficult to absorb thermal displacement caused by high temperatures, exacerbating stress concentration and the risk of tube rupture; and maintenance of the suspended structure requires disassembly and reassembly of the insulation layer, resulting in difficult construction, high costs, and significant hidden dangers. The current trend of high parameters in gas turbine waste heat boilers (such as steam temperatures exceeding 600℃) and peak-shaving operation further exposes the shortcomings of traditional structures in terms of material temperature resistance, thermal expansion compensation, and dynamic stability. There is an urgent need to innovate the suspension design of the heating surface in high-temperature areas to adapt to peak-shaving demands and ensure the long-term safe and reliable operation of the high-temperature heating surface. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs an external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler, which optimizes and solves the problems of difficult material selection, large structural size, easy leakage of flue gas at the insulation area, and difficult maintenance of traditional internal furnace suspension rods / plates in high-temperature areas.

[0005] The present invention adopts the following technical solution:

[0006] An external pipe suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler includes multiple top suspension beams fixed to the upper part of the boiler body. Each of the top suspension beams is connected to a base plate via fasteners. Corresponding sleeve connection holes are provided on the base plates for connecting pre-embedded sleeves. Main connecting plates for the suspension device are fixedly installed on the base plates between the sleeves and the top suspension beams on both sides. The main connecting plates of the suspension device are made of steel plates capable of absorbing horizontal expansion, ensuring uniform stress and free expansion for each pipe joint. Furthermore, all construction of the suspension structure is carried out outside the boiler, facilitating manufacturing, flaw detection, and subsequent maintenance.

[0007] Preferably, the main connecting plates of the hanging device are in two sets, which are symmetrically distributed on the left and right sides of the sleeve.

[0008] Preferably, a top plate is fixedly connected between the two sets of main connecting plates.

[0009] Preferably, auxiliary beams for hanging devices are fixedly installed between the multiple top hanging beams on both sides of the base plate.

[0010] Preferably, the base plate is provided with an oblong hole for installing fasteners.

[0011] Preferably, the fastener consists of a bolt, a nut, and a washer.

[0012] Preferably, the sleeve is connected to the base plate and the main connecting plate of the hanging device by bevel welding.

[0013] Preferably, the main connecting plate of the hanging device and the top plate are connected by bevel welding.

[0014] Preferably, the base plate and the main connecting plate of the hanging device are connected by bevel welding.

[0015] Preferably, the sleeve is made of seamless steel pipe. This reduces the amount of welding and flaw detection work, and also reduces maintenance problems caused by subsequent weld issues. The connection between the sleeve and the top hanging beam uses steel plates of different thicknesses according to the actual load, so as to flexibly select materials and process them into specific shapes.

[0016] The beneficial effects of this utility model are: (1) By setting up an external furnace hanging structure that can expand freely in the horizontal direction, the problem of flue gas leakage caused by the hanging rod and hanging plate penetrating the insulation is avoided, the material selection of the hanging device is optimized, the manufacturing and maintenance are simplified, thereby reducing the manufacturing and maintenance costs and the risk of long-term operation; (2) The installation, flaw detection and maintenance of this structure are all outside the furnace, which is convenient for manufacturing and maintenance; (3) This structure is located outside the furnace, and the material selection is not affected by the high flue gas temperature. Only the design temperature of the wall-penetrating pipe needs to be considered. The material selection level is low and the thickness is relatively low compared with the internal furnace structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 yes Figure 1 Top view;

[0019] Figure 3 yes Figure 1 Cross-sectional view along the AA direction;

[0020] Figure 4 This is a schematic diagram of the structure of the bottom plate in this utility model;

[0021] In the diagram: 1. Sleeve, 2. Base plate, 3. Main connecting plate of the hanging device, 4. Top plate, 5. Fastener, 6. Auxiliary beam of the hanging device, 7. Top hanging beam, 8. Oval hole, 9. Sleeve connection hole. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0023] Example: Figures 1-3 As shown, an external pipe suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler includes three top suspension beams 7 fixed above the boiler body. A base plate 2 is installed between the three top suspension beams via fasteners 5. Correspondingly, sleeve connection holes 9 are provided on the base plates for connecting pre-embedded sleeves 1. Main connecting plates for the suspension device are fixedly installed on the base plates between the sleeves and the top suspension beams. There are two sets of main connecting plates for the suspension device, symmetrically distributed on the left and right sides of the sleeves. A top mounting plate 4 is fixedly connected between the two sets of main connecting plates. Auxiliary beams 6 for the suspension device are fixedly installed between the three top suspension beams on both sides of the base plate. Oval holes 8 are correspondingly provided on the base plate for fastener installation. The fasteners 5 can expand freely within the oval holes on the base plate 2. The sleeves are connected to the base plate and the main connecting plates for the suspension device using bevel welding. The main connecting plates for the suspension device are also connected to the top mounting plate using bevel welding. The base plate and the main connecting plate of the suspension device are connected by bevel welding. The sleeve is made of seamless steel pipe.

[0024] The two parallel main connecting plates 3 of the suspension devices are connected at the top by a top plate 4 to increase structural stability. The auxiliary beam 6 of the transverse suspension device connects the three suspension beams into an integral frame to enhance the stability of the suspension structure during lifting and operation.

[0025] As can be seen from the above, because this utility model adopts a hanging structure that can slide freely outside the furnace, the temperature outside the furnace is relatively low, and the hanging device can be made of lower-specification materials and thinner steel plates; it completely avoids the hidden danger of flue gas leakage caused by the hanging device passing through the insulation; the oval hole structure on the bottom plate of the hanging plate solves the problem of excessive thermal stress caused by the expansion of the header in the length direction; this structure simplifies manufacturing and maintenance; the frame structure of the hanging beam enhances the stability of the hanging system and reduces the impact of various operating conditions of the peak-shaving unit on the hot surface.

[0026] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler, comprising multiple top suspension beams fixed above the boiler body, characterized in that, The multiple top hanging beams are respectively installed with base plates by fasteners. The base plates are respectively provided with sleeve connection holes for connecting pre-embedded sleeves. The main connecting plates of the hanging device are respectively fixedly installed on the base plates between the sleeves and the top hanging beams.

2. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The main connecting plates of the hanging device are in two sets, which are symmetrically distributed on the left and right sides of the sleeve.

3. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 2, characterized in that, A top plate is fixedly connected between the two sets of main connecting plates.

4. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, Auxiliary beams for hanging devices are fixedly installed between the multiple top hanging beams on both sides of the base plate.

5. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The base plate is provided with corresponding oval holes for the installation of fasteners.

6. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The fastener consists of bolts, nuts, and washers.

7. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The sleeve is connected to the base plate and the main connecting plate of the hanging device by bevel welding.

8. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The main connecting plate of the hanging device is connected to the top plate by bevel welding.

9. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The base plate and the main connecting plate of the hanging device are connected by bevel welding.

10. The external tube suspension structure for the high-temperature hot surface of a gas turbine waste heat boiler according to claim 1, characterized in that, The casing is made of seamless steel pipe.

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