A kind of H-grade combined cycle waste heat boiler superheater and reheat device hanging pipe structure
By adopting a suspended tube structure and a separate support beam design in the H-class combined cycle waste heat boiler, the problem of overheating of traditional suspension rod structures is solved, achieving safe cooling and reliable support of the suspended metal and avoiding the adverse effects of contact with high-temperature flue gas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI HUAGUANG BOILER
- Filing Date
- 2025-08-12
- Publication Date
- 2026-08-04
AI Technical Summary
The traditional boom structure of the H-class combined cycle waste heat boiler is prone to overheating in high-temperature flue gas environments, and the contact between the boom and the flue gas causes adverse effects. The existing design cannot meet the upper limit of the allowable temperature of the materials.
The system adopts a hanging pipe structure, in which the hanging pipe support beam is separated from the boiler top protective plate. The steam medium inside the hanging pipe is used for cooling and is supported on the boiler's large plate beam by the hanging pipe support, which avoids overheating and reduces the contact of flue gas.
Ensure that the suspended metal does not exceed the allowable temperature of the material to avoid overheating, improve safety and reliability, and reduce the risk of contact between the suspension beam and high-temperature flue gas.
Smart Images
Figure CN224593264U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of waste heat boiler technology, specifically to a superheater and reheater hanging tube structure for an H-class combined cycle waste heat boiler. Background Technology
[0002] Combined cycle (CCC) power generation is a mainstream power generation technology in developed countries worldwide, boasting advantages such as high overall efficiency and low pollution emissions. The waste heat boiler absorbs the exhaust heat from the gas turbine to produce steam, which then enters the steam turbine; it is a crucial piece of equipment in a CCC power plant. The flue gas side of the waste heat boiler receives the gas turbine exhaust. With the development of gas turbines, the exhaust temperature of H-class gas turbines has exceeded 650℃, with some exceeding 700℃. In horizontal waste heat boilers, both the upper and lower headers are located inside the furnace. The gas turbine exhaust of H-class CCCs exceeds the maximum allowable temperature of the Gr91 and Gr92 header lifting lug steel plates. Therefore, only a suspended pipe structure can be used for the superheater and reheater supports. Traditionally, a rod structure is used, but this may still exceed the material's allowable temperature limit, and the contact between the lifting beams and the high-temperature flue gas still poses an adverse overheating risk. Summary of the Invention
[0003] To solve the above-mentioned technical problems, this utility model provides a hanging pipe structure for the superheater and reheater of an H-class combined cycle waste heat boiler. The hanging pipe structure will not exceed the upper limit of the allowable temperature of the material, and the hanging pipe support beam is completely separated from the top protective plate of the waste heat boiler to avoid the adverse effects of overheating.
[0004] The technical solution is as follows: A hanging pipe structure for the superheater and reheater of an H-class combined cycle waste heat boiler includes a boiler top cover plate, a superheater and reheater tube panel, and a boiler top large plate beam. The structure is characterized by a hanging pipe support beam positioned above the boiler top cover plate, with both ends connected to the boiler top large plate beam and the lower end not contacting the boiler top cover plate. Hanging pipes connected to the top header are installed on the superheater and reheater tube panel. The hanging pipes penetrate the boiler top cover plate and are equipped with through-wall metal expansion joints. The hanging pipes are connected to hanging pipe supports, which are supported on the hanging pipe support beam.
[0005] A further feature is that the hanging pipe support includes an upper annular plate, a middle cylinder, and a lower annular plate. The outer wall of the middle cylinder is welded with stiffening plates. Support plates are connected to both sides of the lower annular plate. Reinforcing plates are provided on the support plates, and the support plates are supported on the hanging pipe support beam. A baffle is welded to the outer wall of the hanging pipe. The hanging pipe passes through the middle cylinder of the hanging pipe support and the baffle is supported on the upper annular plate of the hanging pipe support. A limit mechanism is provided on the hanging pipe support beam.
[0006] By adopting this utility model, the original hanging rod structure is adjusted to a hanging pipe structure. The pipes connecting the superheater and reheater tube panels and the top header are directly used as hanging pipes. The steam medium in the hanging pipes can be used for cooling, ensuring that the hanging metal in the high-temperature flue gas zone does not exceed the upper limit of the material's allowable temperature. Moreover, the hanging pipe support beam is completely separated from the boiler top liner and does not come into contact with it. Therefore, the hanging pipe support beam will not come into contact with the high-temperature flue gas inside the liner, avoiding the adverse effects of overheating. Attached Figure Description
[0007] Figure 1 This is a front view of the structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 for Figure 2 Schematic diagram of the central hanging pipe support; Figure 4 This is a three-dimensional view of the hanging pipe support of this utility model supported by the hanging pipe support beam (excluding the limiting mechanism). Detailed Implementation
[0008] See Figure 1 , Figure 2 , Figure 3 As shown, an H-class combined cycle waste heat boiler superheater and reheater hanging pipe structure includes a boiler top cover plate 1, a superheater and reheater tube panel 6, and a boiler top large plate beam 3. A hanging pipe support beam 2 is provided above the boiler top cover plate 1. The two ends of the hanging pipe support beam 2 are connected to the boiler top large plate beam 3, and the bottom does not contact the boiler top cover plate 1, that is, they are detached from each other, which effectively prevents the flue gas inside the boiler top cover plate 1 from contacting the hanging pipe support beam 2 through the boiler top cover plate 1, and prevents the metal of the hanging pipe support beam 2 from overheating. A hanging pipe 7 connected to the top header is provided on the superheater and reheater tube panel 6. The hanging pipe 7 penetrates the boiler top cover plate 1 and is provided with a wall-penetrating metal expansion joint 4. The wall-penetrating metal expansion joint 4 is used to absorb the expansion and at the same time prevent flue gas leakage at the wall penetration. The hanging pipe 7 is connected to the hanging pipe support 5, and the hanging pipe support 5 is supported on the hanging pipe support beam 2.
[0009] The hanging pipe support 5 includes an upper annular plate 5-1, a middle cylinder 5-2, and a lower annular plate. The outer wall of the middle cylinder 5-2 is welded with stiffening plates 5-3. Support plates 5-4 are connected to both sides of the lower annular plate. Reinforcing plates 5-5 are installed on the support plates 5-4, which are supported by the hanging pipe support beam 2. A baffle 7-1 is welded to the outer wall of the hanging pipe 7. The hanging pipe 7 passes through the middle cylinder 5-2 of the hanging pipe support 5, and the baffle 7-1 is supported by the upper annular plate 5-1 of the hanging pipe support 5. The hanging pipe 7 is not welded; it is directly supported by the baffle 7-1. To prevent forward, backward, left, and right movement, a limiting mechanism 8 is provided on the hanging pipe support beam 2. The limiting mechanism 8 consists of three baffles.
[0010] Stainless steel plates can also be pre-embedded on the hanging pipe support beam 2 to reduce the coefficient of friction.
[0011] This application adjusts the superheater and reheater (i.e., the entire first-stage heating surface module) to a suspended tube structure. At the same time, it adopts a more reliable suspended tube support with a higher safety margin to support the suspended tubes on the module suspension beams between the boiler's large plate beams. The original suspension rod structure has been completely changed to a suspended tube structure. With the cooling of the steam medium inside the suspended tubes, it can be ensured that in the high-temperature flue gas zone (≥650℃), the suspended metal does not exceed the upper limit of the material's allowable temperature.
Claims
1. A H-class combined cycle waste heat boiler superheater and reheater hanger tube structure comprising a boiler roof deck, superheater and reheater tube panels, and a boiler roof girder, characterized by, A hanging pipe support beam is provided above the top protective plate of the boiler. The two ends of the hanging pipe support beam are connected to the top large plate beam of the boiler, and the bottom does not contact the top protective plate of the boiler. Hanging pipes connected to the top header are provided on the tube panels of the superheater and reheater. The hanging pipes penetrate the top protective plate of the boiler and are provided with through-wall metal expansion joints. The hanging pipes are connected to hanging pipe supports, and the hanging pipe supports are supported on the hanging pipe support beam.
2. A H-class combined cycle waste heat boiler superheater and reheater hanger tube structure according to claim 1, characterized in that, The hanging pipe support includes an upper annular plate, a middle cylinder, and a lower annular plate. The outer wall of the middle cylinder is welded with stiffening plates. Support plates are connected to both sides of the lower annular plate. Reinforcing plates are provided on the support plates, and the support plates are supported by the hanging pipe support beam.
3. A H-class combined cycle waste heat boiler superheater and reheater hanger tube structure according to claim 2, characterized in that, A baffle is welded to the outer wall of the hanging pipe. The hanging pipe passes through the middle cylinder of the hanging pipe support, and the baffle is supported on the upper annular plate of the hanging pipe support.
4. A H-class combined cycle waste heat boiler superheater and reheater hanger tube structure according to claim 1, characterized in that, A limit mechanism is provided on the hanging pipe support beam.