Large-sized high-temperature flue gas reversing valve

Abstract

The application provides a high-temperature flue gas large-scale reversing valve, and a heat insulation valve plate comprises a framework, heat insulation structures are connected to both sides of the framework, a center long circular hole located at a center position is formed on four side edges of the heat insulation structure, and elastic long circular holes are arranged on both sides of the center long circular hole, the length direction of the elastic long circular hole is consistent with the length direction of the side edge, the length direction of the center long circular hole is perpendicular to the length direction of the elastic long circular hole, and the heat insulation structure is connected with the framework through a bolt pair. The heat insulation valve plate of the high-temperature flue gas large-scale reversing valve adopts a "sandwich" structure, heat insulation structures are arranged on both sides of the framework, a center long circular hole located at a center position is formed on four side edges of the heat insulation structure, and elastic long circular holes are arranged on both sides of the center long circular hole, so that the heat insulation structure is relatively fixed, the deformation caused by thermal expansion and cold contraction is eliminated, the deformation probability of the heat insulation valve plate is reduced, the sealing effect is improved, the maintenance frequency is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This invention belongs to the technical fields of reversing valves, high-temperature flue gas waste heat utilization, gas-fired power generation and energy storage technologies, and specifically relates to a large high-temperature flue gas reversing valve. Background Technology

[0002] Guided by energy conservation and emission reduction policies, gas turbines have been widely applied and developed in the petroleum and chemical industries, leading to a surge in high-temperature flue gas waste heat recovery and utilization technologies and projects. In these projects, a device is typically selected to switch between single-cycle power generation and combined cycle utilization (waste heat power generation and energy storage). This device can even be used to allocate gas turbine exhaust volume to regulate the load on waste heat equipment or energy storage devices, making it a crucial component for waste heat utilization in gas-fired power generation. This device is the high-temperature flue gas large-scale reversing valve.

[0003] High-temperature flue gas reversing valves are generally three-way structures. One port connects to the gas turbine, and the other two ports connect to a bypass chimney and waste heat recovery equipment (waste heat boiler or energy storage equipment), respectively. A valve plate is installed between the remaining two ports. Switching the valve plate allows for the reversal of flue gas flow direction. When the valve plate is closed to the bypass chimney side, the high-temperature flue gas generated by the gas turbine is discharged into the waste heat recovery equipment (waste heat boiler or energy storage equipment) for combined recycling. When the valve plate is closed to the waste heat recovery equipment side, the high-temperature flue gas generated by the gas turbine is discharged into the bypass chimney, and the gas turbine operates in a single-cycle mode. Due to the harsh operating environment, the valve plate of the reversing valve is prone to deformation due to thermal expansion and contraction during high-temperature operation and cooling, resulting in substandard sealing performance, high maintenance frequency, and a short effective service life. Summary of the Invention

[0004] Based on the above requirements, the present invention provides a large-scale reversing valve for high-temperature flue gas.

[0005] The technical solution for this large high-temperature flue gas reversing valve is implemented as follows:

[0006] A large high-temperature flue gas reversing valve includes a valve body with a flue gas inlet, a chimney outlet, and a waste heat utilization outlet. The chimney outlet and the waste heat utilization outlet are vertically arranged, and a heat insulation valve plate is rotatably connected at their inner corners. The heat insulation valve plate includes a frame, and heat insulation structures are connected to both sides of the frame. Each of the four sides of the heat insulation structure has a central elongated oval hole and telescopic elongated oval holes on both sides of the central elongated oval hole. The length direction of the telescopic elongated oval holes is consistent with the length direction of the side they are located on, and the length direction of the central elongated oval hole is perpendicular to the length direction of the telescopic elongated oval holes. The heat insulation structures are connected to the frame by bolts.

[0007] Preferably, the telescopic elongated holes on both sides of the central elongated hole are symmetrically arranged with the central elongated hole as the center, and the central elongated holes and telescopic elongated holes on the two parallel sides of the four sides of the heat insulation structure correspond one-to-one and are matched.

[0008] Preferably, the heat insulation valve plate is surrounded by sealing sheets.

[0009] Preferably, a first sealing plate and a second sealing plate are sequentially arranged from the inside to the outside at the chimney outlet. The distance between the edge of the first sealing plate and the axis of the chimney outlet is greater than the distance between the edge of the second sealing plate and the axis of the chimney outlet. On the heat insulation structure used to seal the chimney outlet, a first elastic metal sealing sheet and a second elastic metal sealing sheet are also sequentially arranged from the frame towards the heat insulation structure. The distance between the edge of the first elastic metal sealing sheet and the axis of the heat insulation valve plate is greater than the distance between the edge of the second elastic metal sealing sheet and the axis of the heat insulation valve plate.

[0010] The waste heat utilization outlet is also provided with a first sealing plate and a second sealing plate in sequence from the inside to the outside. The distance between the edge of the first sealing plate and the axis of the waste heat utilization outlet is greater than the distance between the edge of the second sealing plate and the axis of the waste heat utilization outlet. On the heat insulation structure used to seal the waste heat utilization outlet, a first elastic metal sealing sheet and a second elastic metal sealing sheet are also provided in sequence from the frame to the direction of the heat insulation structure. The distance between the edge of the first elastic metal sealing sheet and the axis of the heat insulation valve plate is greater than the distance between the edge of the second elastic metal sealing sheet and the axis of the heat insulation valve plate.

[0011] Preferably, both the chimney outlet and the waste heat utilization outlet are provided with compressed air inlets, which are located between the corresponding first and second sealing plates. A check valve is installed on the compressed air inlet, and the flow direction of the check valve is from the outside to the inside.

[0012] Preferably, the valve body is provided with a power unit, the output shaft of the power unit is shaft-connected to a main shaft, a crank connecting rod is fixedly connected to the main shaft, and the end of the crank connecting rod is rotatably connected to the heat insulation valve plate.

[0013] To overcome the defect of existing directional valve plates that are prone to deformation due to thermal expansion and contraction during high-temperature operation and cooling, this high-temperature flue gas large-scale reversing valve features a novel heat-insulating valve plate. It employs a "sandwich" structure, with heat-insulating structures on both sides of the frame. One side seals the chimney outlet, while the other seals the waste heat recovery outlet. Each of the four sides of the heat-insulating structure has a central elongated hole and expansion elongated holes on either side of the central hole. The heat-insulating structure is connected to the frame using bolts, which do not form a tight fit but rather allow for some movement. Based on the principle of material deformation, the overall deformation trend of the heat-insulating structure along its length is influenced by the bolts. To allow its overall length to be stretched or shortened, the deformation trend in its width direction is to stretch or shorten its overall width. The thermal insulation structure is relatively fixed to the frame through the central elongated holes located at the center of its four sides. The expansion and contraction elongated holes on the two parallel sides that are aligned with the length direction of the thermal insulation structure provide expansion and contraction space for deformation in the length direction. The expansion and contraction elongated holes on the two parallel sides that are aligned with the width direction of the thermal insulation structure provide expansion and contraction space for deformation in the width direction. This ensures that the thermal insulation structure is relatively fixed and eliminates deformation caused by thermal expansion and contraction, thereby reducing the probability of deformation of the thermal insulation valve plate, improving the sealing effect, reducing maintenance frequency, and extending service life. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0015] Figure 1 This is a side view schematic diagram of the structure of a large high-temperature flue gas reversing valve;

[0016] Figure 2 This is a top view schematic diagram of the structure of a large high-temperature flue gas reversing valve;

[0017] Figure 3 This is a schematic diagram of the main structure of a large high-temperature flue gas reversing valve;

[0018] Figure 4 This is a schematic diagram of the thermal insulation structure of the large high-temperature flue gas reversing valve.

[0019] Figure 5 This is a schematic diagram of the sealing state of a large high-temperature flue gas reversing valve;

[0020] Figure 6 This is a schematic diagram of the operation of a large high-temperature flue gas reversing valve sealing the chimney outlet.

[0021] Figure 7 This is a schematic diagram of the working process of the sealing waste heat utilization outlet of the large high-temperature flue gas reversing valve.

[0022] Explanation of reference numerals in the attached figures:

[0023] In the diagram: 1. Flue gas inlet, 2. Chimney outlet, 3. Waste heat recovery outlet, 4. Valve body, 5. Insulation valve plate, 6. Main shaft, 7. Crank connecting rod, 8. Power unit, 41. Compressed gas inlet, 42. Check valve, 43. First sealing plate, 44. Second sealing plate, 51. Frame, 52. Insulation structure, 53. First elastic metal sealing sheet, 54. Second elastic metal sealing sheet, 55. Central elongated hole, 56. Telescopic elongated hole, 57. Fastening pair. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] A large high-temperature flue gas reversing valve, such as Figures 1 to 7 As shown, the device includes a valve body 4, which has a flue gas inlet 1, a chimney outlet 2, and a waste heat utilization outlet 3. The chimney outlet 2 and the waste heat utilization outlet 3 are vertically arranged, and a heat insulation valve plate 5 is rotatably connected at their inner corner. Under the action of an external driving force, the heat insulation valve plate 5 can alternately seal either the chimney outlet 2 or the waste heat utilization outlet 3 to switch the flow direction of the high-temperature flue gas. When the heat insulation valve plate 5 seals the chimney outlet 2, the waste heat utilization outlet 3 is in a connected state, and the high-temperature flue gas enters from the flue gas inlet 1 and exits from the waste heat utilization outlet 3. When the heat insulation valve plate 5 seals the waste heat utilization outlet 3, the chimney outlet 2 is open. In the connected state, high-temperature flue gas enters from the flue gas inlet 1 and exits from the chimney outlet 2. The heat insulation valve plate 5 includes a frame 51, and heat insulation structures 52 are connected to both sides of the frame 51. Each of the four sides of the heat insulation structure 52 has a central elongated hole 55 located at the center and telescopic elongated holes 56 arranged on both sides of the central elongated hole 55. The length direction of the telescopic elongated holes 56 is consistent with the length direction of the side on which they are located. The length direction of the central elongated hole 55 is perpendicular to the length direction of the telescopic elongated holes 56, that is, the length direction of the central elongated hole 55 is perpendicular to the length direction of the side on which it is located. The heat insulation structure 52 is connected to the frame 51 by bolts 57.

[0027] To overcome the defect of existing directional valve plates that are prone to deformation due to thermal expansion and contraction during high-temperature operation and cooling, this high-temperature flue gas large-scale reversing valve features a novel heat-insulating valve plate 5. It employs a "sandwich" structure, with heat-insulating structures 52 on both sides of the frame 51. One side of the heat-insulating structure 52 seals the chimney outlet 2, while the other side seals the waste heat recovery outlet 3. Each of the four sides of the heat-insulating structure 52 has a central elongated hole 55 and telescopic elongated holes 56 on either side of the central elongated hole 55. The heat-insulating structure 52 is connected to the frame 51 via bolt pairs 57. The bolt pairs 57 are not in a tight contact with the heat-insulating structure 52 and the frame 51, but rather have a certain clearance. Based on the principle of material deformation, the heat-insulating structure 52, as a whole, extends along its length... The deformation trend in the upper direction is to stretch or shorten its overall length, and the deformation trend in its width direction is to stretch or shorten its overall width. The thermal insulation structure 52 is relatively fixed to the frame 51 through the central elongated holes 55 located at the center of its four sides. The expansion and contraction elongated holes 56 on the two parallel sides that are consistent with the length direction of the thermal insulation structure 52 provide expansion and contraction space for the deformation in the length direction of the thermal insulation structure 52. The expansion and contraction elongated holes 56 on the two parallel sides that are consistent with the width direction of the thermal insulation structure 52 provide expansion and contraction space for the deformation in the width direction of the thermal insulation structure 52. In this way, the thermal insulation structure 52 is relatively fixed, and deformation caused by thermal expansion and contraction is eliminated. This achieves the purpose of reducing the probability of deformation of the thermal insulation valve plate 5, improving the sealing effect, reducing the maintenance frequency, and extending the service life.

[0028] In this large high-temperature flue gas reversing valve, the telescopic elongated holes 56 on both sides of the central elongated hole 55 are symmetrically arranged with the central elongated hole 55 as the center. The central elongated holes 55 and telescopic elongated holes 56 on the two parallel sides of the four sides of the heat insulation structure 52 correspond to each other and are matched.

[0029] In this large high-temperature flue gas reversing valve, the heat insulation valve plate 5 is surrounded by sealing plates. The sealing plates are preferably made of a high-temperature resistant and elastic metal material, which can compensate for deformation caused by thermal expansion and contraction through elasticity, thereby further enhancing the sealing performance.

[0030] In this large high-temperature flue gas reversing valve, a first sealing plate 43 and a second sealing plate 44 are arranged sequentially from the inside to the outside at the chimney outlet 2. The distance between the edge of the first sealing plate 43 and the axis of the chimney outlet 2 is greater than the distance between the edge of the second sealing plate 44 and the axis of the chimney outlet 2. On the heat insulation structure 52 used to seal the chimney outlet 2, a first elastic metal sealing sheet 53 and a second elastic metal sealing sheet 54 are also arranged sequentially from the frame 51 in the direction of the heat insulation structure 52. The distance between the edge of the first elastic metal sealing sheet 53 and the axis of the heat insulation valve plate 5 is greater than the distance between the edge of the second elastic metal sealing sheet 54 and the axis of the heat insulation valve plate 5.

[0031] A first sealing plate 43 and a second sealing plate 44 are also arranged sequentially from the inside to the outside at the waste heat utilization outlet 3. The distance between the edge of the first sealing plate 43 and the axis of the waste heat utilization outlet 3 is greater than the distance between the edge of the second sealing plate 44 and the axis of the waste heat utilization outlet 3. A first elastic metal sealing sheet 53 and a second elastic metal sealing sheet 54 are also arranged sequentially from the frame 51 toward the direction of the heat insulation structure 52 used to seal the waste heat utilization outlet 3. The distance between the edge of the first elastic metal sealing sheet 53 and the axis of the heat insulation valve plate 5 is greater than the distance between the edge of the second elastic metal sealing sheet 54 and the axis of the heat insulation valve plate 5.

[0032] When the chimney outlet 2 is sealed, the heat insulation valve plate 5 turns to the side of the chimney outlet 2. The second elastic metal sealing strip 54 on the heat insulation structure 52 used to seal the chimney outlet 2 is fastened to the second sealing plate 44, and the first elastic metal sealing strip 53 is fastened to the first sealing plate 43. The first sealing plate 43, the second sealing plate 44, the first elastic metal sealing strip 53, the second elastic metal sealing strip 54, the valve body 4, and the heat insulation structure 52 used to seal the chimney outlet 2 together form a closed annular sealing channel, which can further enhance the sealing performance. When the waste heat utilization outlet 3 is sealed, the heat insulation valve plate 5 turns to the side of the waste heat utilization outlet 3. The second elastic metal sealing strip 54 on the heat insulation structure 52 used to seal the waste heat utilization outlet 3 is fastened to the second sealing plate 44, and the first elastic metal sealing strip 53 is fastened to the first sealing plate 43. The first sealing plate 43, the second sealing plate 44, the first elastic metal sealing strip 53, the second elastic metal sealing strip 54, the valve body 4, and the heat insulation structure 52 used to seal the waste heat utilization outlet 3 can also form a closed annular sealing channel, further enhancing the sealing performance.

[0033] In this large high-temperature flue gas reversing valve, compressed gas inlets 41 are provided at both the chimney outlet 2 and the waste heat utilization outlet 3. The compressed gas inlets 41 are located between the corresponding first sealing plate 43 and second sealing plate 44. A check valve 42 is installed on the compressed gas inlet 41, and the flow direction of the check valve 42 is from the outside to the inside.

[0034] The installation of the check valve 42 must ensure that external gas can enter while preventing the internal high-temperature flue gas from flowing back out. When sealing the chimney outlet 2 or waste heat recovery outlet 3 through the heat insulation valve plate 5, air can be injected through the corresponding compressed air inlet 41 by an external booster fan into the annular sealing channel formed by the first sealing plate 43, the second sealing plate 44, the first elastic metal sealing sheet 53, the second elastic metal sealing sheet 54, the valve body 4, and the corresponding heat insulation structure 52. This balances the pressure of the annular sealing channel with the high-temperature flue gas, reduces the pressure of the high-temperature flue gas on the heat insulation valve plate 5 and the sealing sheet, lowers the probability of deformation of the heat insulation valve plate 5 and the sealing sheet, and ensures good overall sealing. Two external booster fans can be installed, one for backup.

[0035] In this large high-temperature flue gas reversing valve, a power unit 8 is installed on the valve body 4. The output shaft of the power unit 8 is shaft-connected to a main shaft 6, and a crank connecting rod 7 is fixedly connected to the main shaft 6. The end of the crank connecting rod 7 is rotatably connected to the heat insulation valve plate 5. The rotation of the power unit 8 drives the main shaft 6 to rotate, which in turn drives the heat insulation valve plate 5 to rotate through the crank connecting rod 7, thereby completing the sealing work of the chimney outlet 2 or the waste heat utilization outlet 3.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large high-temperature flue gas reversing valve, comprising a valve body (4), wherein the valve body (4) is provided with a flue gas inlet (1), a chimney outlet (2) and a waste heat utilization outlet (3), wherein the chimney outlet (2) and the waste heat utilization outlet (3) are vertically arranged, and a heat insulation valve plate (5) is rotatably connected at the inner corner of the two, characterized in that: The heat insulation valve plate (5) includes a frame (51), and heat insulation structures (52) are connected to both sides of the frame (51). Each of the four sides of the heat insulation structure (52) has a central elongated hole (55) located in the center and telescopic elongated holes (56) arranged on both sides of the central elongated hole (55). The length direction of the telescopic elongated holes (56) is consistent with the length direction of the side on which they are located. The length direction of the central elongated hole (55) is perpendicular to the length direction of the telescopic elongated holes (56). The heat insulation structure (52) and the frame (51) are connected by bolt pairs (57). Sealing plates are connected around the heat insulation valve plate (5). At the chimney outlet (2), a first sealing plate (43) and a second sealing plate (44) are arranged sequentially from the inside to the outside. The distance between the edge of the first sealing plate (43) and the axis of the chimney outlet (2) is greater than the distance between the edge of the second sealing plate (44) and the axis of the chimney outlet (2). On the heat insulation structure (52) used to seal the chimney outlet (2), a first elastic metal sealing sheet (53) and a second elastic metal sealing sheet (54) are also arranged sequentially from the frame (51) in the direction of the heat insulation structure (52). The distance between the edge of the first elastic metal sealing sheet (53) and the axis of the heat insulation valve plate (5) is greater than the distance between the edge of the second elastic metal sealing sheet (54) and the axis of the heat insulation valve plate (5). The waste heat A first sealing plate (43) and a second sealing plate (44) are also arranged sequentially from the inside to the outside at the outlet (3). The distance between the edge of the first sealing plate (43) and the axis of the waste heat utilization outlet (3) is greater than the distance between the edge of the second sealing plate (44) and the axis of the waste heat utilization outlet (3). On the heat insulation structure (52) used to seal the waste heat utilization outlet (3), a first elastic metal sealing sheet (53) and a second elastic metal sealing sheet (54) are also arranged sequentially from the skeleton (51) to the direction of the heat insulation structure (52). The distance between the edge of the first elastic metal sealing sheet (53) and the axis of the heat insulation valve plate (5) is greater than the distance between the edge of the second elastic metal sealing sheet (54) and the axis of the heat insulation valve plate (5). Compressed gas inlets (41) are provided at both the chimney outlet (2) and the waste heat utilization outlet (3). The compressed gas inlets (41) are located between the corresponding first sealing plate (43) and second sealing plate (44). A check valve (42) is installed on the compressed gas inlet (41), and the flow direction of the check valve (42) is from the outside to the inside.

2. The large high-temperature flue gas reversing valve according to claim 1, characterized in that: The telescopic elongated holes (56) on both sides of the central elongated hole (55) are symmetrically arranged with the central elongated hole (55) as the center. The central elongated holes (55) and telescopic elongated holes (56) on the two parallel sides of the four sides of the heat insulation structure (52) correspond to each other and are matched.

3. The large high-temperature flue gas reversing valve according to claim 1, characterized in that: The valve body (4) is provided with a power unit (8), the output shaft of the power unit (8) is connected to a main shaft (6), a crank connecting rod (7) is fixedly connected to the main shaft (6), and the end of the crank connecting rod (7) is rotatably connected to the heat insulation valve plate (5).

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