A heat-insulated flow guide device

Abstract

This invention discloses a heat-insulated flow guide tube device, comprising an outer cylinder and four lugs. The outer cylinder contains an inner shell, an outer shell, two tube bundle support plates, two tube bundle side sealing plates, a connected upper water supply manifold, a heat exchange tube bundle, and a lower water supply manifold. An air inlet pipe seat is fixedly connected to the upper end of the outer cylinder. An expansion section is provided in the lower part of the inner hole of the air inlet pipe seat, and an inner liner pipe is fixedly connected within the expansion section. Steel beams are fixedly connected to the two lugs in the same group, and the two steel beams are fixedly connected by two connecting beams. Both the inner and outer shells are fixedly connected to the steel beams below through their angle steel columns, and the upright plates of the inner and outer shells contact the steel beams. Inspection holes are provided on the upright plates of both the inner and outer shells on the same side. This invention is not only easy to manufacture and has good heat insulation, but also has low temperature difference stress and thermal stress, which can prevent deformation and cracking of the flow guide tube and prevent the cooled air from being reheated in reverse, ensuring the efficiency of the cooler, while also increasing the maintenance space.

Description

Technical Field

[0001] This invention relates to a heat-insulated flow guide device, particularly a heat-insulated flow guide device for TCA coolers. Background Technology

[0002] The TCA (Turbine Cooling Air) cooler is an essential auxiliary device for gas turbines. Its function is to use low-temperature, high-pressure feedwater to cool a portion of the high-temperature, high-pressure air drawn from the gas turbine compressor chamber. This cooled and filtered high-pressure air then cools the turbine rotor and blades. The TCA cooler is a vertical unit. High-temperature compressed air (approximately 470°C) enters the unit through the air inlet pipe of the upper head. All air flows from top to bottom through the guide tube and transfers heat with the heat exchange tube bundle. The cooled air (approximately 230°C) is then circulated through the tube bundle casing and flows back to the upper part of the unit, exiting through the air outlet on the outer cylinder. At the upper part of the unit, the high-temperature air and the cooled air are separated by the guide tube. The tube bundle of the TCA cooler is suspended and fixed inside the cylinder by the upper header and support beams. The guide tube is fixed between the air inlet pipe and the support beams, with sufficient maintenance space provided. During operation, the temperature of the guide tube changes with the commissioning, decommissioning, and load variations of the equipment, thus bearing the cyclical temperature load. To address the expansion issue during operation of the guide tube, an expansion joint is typically installed at the air inlet pipe seat, and the guide tube itself employs a double-layer structure with inner and outer shells. However, this structure has the following drawbacks:

[0003] 1. The selection of expansion joints is difficult, requiring separate ordering, which increases manufacturing costs and time.

[0004] 2. The expansion joint has a large outer diameter and a large gap between the inner and outer shells, resulting in poor heat insulation.

[0005] 3. The expansion joint is long, which reduces the internal maintenance space of the guide tube;

[0006] 3. In some areas, the double-shell structure was not formed, and the temperature in some areas of the guide tube was high, forming new heat dissipation points. This caused the cooled air to be heated in reverse, reducing the efficiency of the TCA cooler.

[0007] 4. Continuous thermal cycling causes plastic fatigue or progressive plastic deformation failure in the guide tube;

[0008] 5. Due to the large temperature difference between the air inside and outside the guide tube, the radial temperature gradient of the guide tube is large and the stress is high, which makes it prone to deformation and cracking. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned shortcomings of the prior art by providing a heat-insulated flow guide device. This device is not only easy to manufacture and has good heat insulation, but also has low temperature difference stress and thermal stress, which can prevent the flow guide from deforming and cracking, and prevent the cooled air from being heated in reverse, thus ensuring the efficiency of the cooler and increasing the maintenance space.

[0010] To achieve the above objectives, the present invention provides a heat-insulating guide tube device, comprising an outer cylinder, which includes a connected cylindrical body and an upper end cap, four lugs fixedly connected to the cylindrical body, and an inner cover, an outer cover, two tube bundle support plates, two tube bundle side sealing plates, a connected upper water supply manifold, a heat exchange tube bundle, and a lower water supply manifold; an air inlet pipe seat is fixedly connected to the upper end cap; the device is characterized in that: the lower section of the inner hole of the air inlet pipe seat is provided with an enlarged diameter section, and an inner liner pipe is fixedly connected within the enlarged diameter section; steel beams are fixedly connected to the two lugs in the same group, and the two steel beams are connected by two connecting... The upper water supply header is fixedly connected to a connecting beam at one end, and its other end passes through another connecting beam and the cylinder and is fixedly connected to the cylinder. The two tube bundle support plates are fixedly connected to the lower ends of the two steel beams, and the two tube bundle side sealing plates are fixedly connected to the lower ends of the two connecting beams. The heat exchange tube bundle is placed between the two tube bundle support plates and the two tube bundle side sealing plates. The outer casing includes an outer casing vertical plate and an outer casing conical plate located on four sides and fixedly connected. The outer casing conical plates are all fixedly connected to the outer casing top plate. A sealing ring is fixedly connected in the central hole of the outer casing top plate. The lower end of the air inlet pipe seat is embedded with a sealing ring. The inner casing includes four outer casing uprights and four outer casing angle steel columns located at the four corners, which are connected by several bolts. The outer casing angle steel columns are all fixed to the steel beams below, and the outer casing uprights are in contact with the steel beams. The inner casing includes four inner casing uprights on the four sides and vertical pads fixed to the inner upper part of each inner casing upright. The four inner casing uprights and the inner casing angle steel columns located at the four corners are all fixed by bolts passing through an elongated hole in one of the uprights and a round hole in another. All are fixedly connected to the steel beam below, and the inner cover plate is in contact with the steel beam; the four inclined pads are fixedly connected to the upper ends of the inner cover angle steel column and the vertical pad on the same side, and each inclined pad is fixedly connected to its respective inner cover cone plate by bolts passing through the elongated hole of one and the round hole of the other. Each inner cover cone plate is fixedly connected to the inner cover top plate, and a sealing ring is fixedly connected in the center hole of the inner cover top plate. The inner wall of the sealing ring is provided with several annular grooves, and the lower end of the inner liner is embedded in the sealing ring; the inner cover plate and the outer cover plate on the same side are provided with inspection holes.

[0011] In operation, the lower feedwater header is connected to an inlet pipe, and the upper feedwater header is connected to an outlet pipe. High-pressure feedwater flows sequentially through the lower feedwater header, the heat exchange tube bundle, and the upper feedwater header, exchanging heat with the high-temperature compressed air introduced through the air inlet pipe seat. The cooled air bypasses the tube bundle support plate and the tube bundle side sealing plate, flips upward, and flows out through the air outlet on the outer cylinder. The structure of this device is relatively simple and easy to manufacture. Both the inner and outer shells are mounted on steel beams via their respective angle steel columns, and their upper ends can expand freely. The sealing ring can slide freely along the axial direction of the inner liner tube with temperature changes, and the sealing ring can slide freely along the axial direction of the air inlet pipe seat, reducing thermal stress. When the high-temperature compressed air enters the inner shell, it expands in volume, and the sealing ring... Several annular grooves in the wall allow for gradual gas expansion and depressurization, preventing the expansion of high-temperature air into the outer space of the inner casing top plate and avoiding the diffusion of high-temperature air into the area between the inner and outer casings, thus reducing leakage and achieving a seal at the connection. The inner casing is a high-temperature zone and is prone to deformation. Due to temperature changes, the inner casing uprights can slide along the surface of the inner casing angle steel columns, and the inner casing cone plates can slide on the surface of the inclined pads, reducing thermal stress and preventing deformation and cracking of the inner casing. The inner and outer casings form a double-layer structure throughout, reducing high-temperature heat dissipation points on the outer casing and preventing reverse heating of the cooled air, thus ensuring the efficiency of the cooler. There are no other components between the inner and outer casings, and the gap between them ensures air insulation.

[0012] As a further improvement of the present invention, the inner and outer surfaces of the inner shell cone plate are provided with several expansion grooves; this can reduce the thermal stress during temperature changes and avoid warping deformation due to temperature changes.

[0013] As a further improvement of the present invention, the inspection hole of the outer shell upright plate includes a door hole provided at the lower part of the outer shell upright plate, two vertical door plates and a horizontal door plate fixedly connected to the outer shell upright plate along the edge of the door hole, and an outer cover plate connected to the two vertical door plates and the horizontal door plate by several bolts.

[0014] As a further improvement of the present invention, the inspection hole of the inner cover plate includes a door hole located at the lower part of the inner cover plate, two vertical frame plates and a horizontal frame plate fixedly connected to the inner cover plate along the edge of the door hole, a pad plate fixedly connected to the inner side of the two vertical frame plates and the horizontal frame plate, and an inner cover plate connected to the three pad plates by several bolts; the inspection holes of the inner and outer cover plates are not only easy to set, but also increase the maintenance space.

[0015] As a further improvement of the present invention, the outer shell angle steel column is provided with several round holes, and the outer shell upright plate is provided with several oblong holes. The four outer shell upright plates are connected to the outer shell angle steel columns located at the four corners by bolts passing through the corresponding oblong holes and round holes. The outer shell upright plates can also slide relative to the outer shell angle steel columns due to temperature changes, thereby reducing thermal stress.

[0016] As a further improvement of the present invention, both steel beams are H-shaped steel beams, and heat insulation plates are fixedly connected to the inner or outer side of the web of the H-shaped steel beams; this can reduce the temperature on the outer side of the H-shaped steel beams and avoid reheating the cooled air.

[0017] As a further improvement of the present invention, both connecting beams are I-beams, and a heat insulation plate is fixedly connected to the inner or outer side of the web of the I-beam; this can reduce the temperature on the outer side of the I-beam and avoid reheating the cooled air.

[0018] As a further improvement of the present invention, the inner cover plate is a double-layer plate structure with a heat insulation layer between the two layers; this avoids convective heat transfer between the inner and outer shells and heat conduction between the frame plates, thus eliminating heat dissipation at this point.

[0019] In summary, this invention is not only easy to manufacture and has good heat insulation effect, but also has low temperature difference stress and thermal stress, which can avoid deformation and cracking of the guide tube, prevent the cooled air from being heated in reverse, ensure the efficiency of the cooler, and increase the maintenance space. Attached Figure Description

[0020] Figure 1 This is a front view of an embodiment of the present invention.

[0021] Figure 2 for Figure 1 The right view.

[0022] Figure 3 for Figure 2 AA sectional view.

[0023] Figure 4 for Figure 1 BB cross-sectional view.

[0024] Figure 5 for Figure 3 Enlarged view of the inspection holes on the inner and outer shell uprights.

[0025] Figure 6 This is a magnified view of a portion of the sealing ring.

[0026] Figure 7 This is a magnified view of a portion of the inner casing cone plate. Detailed Implementation

[0027] The invention will be further described below with reference to the accompanying drawings.

[0028] like Figures 1 to 7As shown, this embodiment of a heat-insulated flow guide tube device includes an outer cylinder, which includes a welded cylindrical body 1, an upper end cap 2, and a lower end cap (not shown). The cylindrical body 1 has an air outlet (not shown), and four lugs 3 are welded and fixed to the cylindrical body 1. An air inlet pipe seat 11 is welded and fixed to the upper end cap 2. The lower section of the inner hole of the air inlet pipe seat 11 has an enlarged diameter section, and an inner liner pipe 12 is welded and fixed to the enlarged diameter section. The outer cylinder contains an inner cover 4, an outer cover 5, two tube bundle support plates 6, two tube bundle side sealing plates 7, an upper water supply manifold 8, a heat exchange tube bundle 9, and a lower water supply manifold (not shown) connected in sequence. Both lugs 3 in the same group are connected by a connecting... The connecting bolts are fixed to both ends of the H-beam 13. A heat insulation plate 14 is welded and fixed to the inner side of the web of the H-beam 13. The two H-beams 13 are welded and fixed to each other via two I-beams 15 on either side. A heat insulation plate 16 is fixed to the inner side of the web of the I-beams 15. One end of the upper water supply manifold 8 passes through a round hole in an I-beam 15 and is connected to it. The other end passes through another I-beam 15 and the cylinder 1 and is welded and fixed to the cylinder 1. The two tube bundle support plates 6 are welded and fixed to the lower ends of the two H-beams 13. The two tube bundle side sealing plates 7 are welded and fixed to the lower ends of the two I-beams 15. The heat exchange tube bundle 9 is placed between the two tube bundle support plates 6 and the two tube bundle side sealing plates 7. Between the sealing plates 7; the inner shell 4 includes inner shell upright plates 41 located on the four sides, and vertical pads 42 fixed to the inner upper end of each inner shell upright plate 41 by bolts. The four inner shell upright plates 41 and the inner shell angle steel columns 43 located at the four corners are all fixed by bolts passing through the elongated holes of the inner shell upright plates 41 and the round holes (the elongated holes can also be set in the inner shell angle steel columns 43) of the inner shell upright plates 41. The ends of the bolts are all provided with nuts. The inner shell angle steel columns 43 are all welded (or fixed by bolts) to the H-shaped steel beams 13 below. The lower end of the inner shell upright plates 41 contacts the H-shaped steel beams 13; four inclined The pad 44 is welded and fixed to the upper end of the inner cover angle steel column 43 and the vertical pad 42 on the same side. Each inclined pad 44 is fixed to its respective inner cover cone plate 45 by bolts passing through the elongated hole 46 of the inclined pad 44 and the round hole of the inner cover cone plate 45. The end of each bolt is provided with a nut. The inner and outer surfaces of the inner cover cone plate 45 are provided with several elongated groove-type expansion grooves 47. Each inner cover cone plate 45 is welded and fixed to the inner cover top plate 48. A sealing ring 49 is welded and fixed in the center hole of the inner cover top plate 48. The inner wall of the sealing ring 49 is provided with several annular grooves 40. The lower end of the inner liner tube 12 is embedded in the sealing ring 49.

[0029] The outer casing 5 includes four outer casing upright plates 51 and outer casing conical plates 52 that are welded and fixed to each other. The outer casing conical plates 52 are all welded and fixed to the outer casing top plate 53. A sealing ring 54 is fixedly connected to the central hole of the outer casing top plate 53. The lower end of the air inlet pipe seat 11 is embedded in the sealing ring 54 and contacts the inner wall of the sealing ring. The four outer casing upright plates 51 are connected to the outer casing angle steel columns 55 located at the four corners by several bolts. Specifically, the outer casing angle... The steel column 55 has several round holes, and the outer shell plate 51 has several oblong holes (same as oblong holes 46). The four outer shell plates 51 are connected to the outer shell angle steel columns 55 located at the four corners by several bolts passing through the corresponding oblong holes and round holes. The outer shell angle steel columns 55 are all welded (or bolted) to the H-beam 13 below, and the lower end of the outer shell plate 51 contacts the H-beam 13. The inner shell plate 4 on the same side... Both the outer casing upright plate 51 and the inner casing upright plate 41 are provided with inspection holes; the inspection holes of the outer casing upright plate include a door hole located at the lower part of the outer casing upright plate 51, two vertical door panels 56 and a horizontal door panel 57 fixedly connected to the outer casing upright plate 51 along the edge of the door hole, and an outer cover plate 58 connected to the two vertical door panels 56 and the horizontal door panel 57 by several bolts; the inspection holes of the inner casing upright plate 41 include a door hole located at the lower part of the inner casing upright plate 41, and a door hole fixedly welded to the inner casing upright plate 41 along the edge of the door hole. Two vertical frame plates 39 and one horizontal frame plate 38, a pad plate 37 welded and fixed to the inner side of the two vertical frame plates 39 and the horizontal frame plate 38, and an inner cover plate 36 connected to the pad plate 37 by several bolts. The inner cover plate 36 has a double-layer plate structure with a heat insulation layer 35 between the double-layer plates. Both the outer cover plate 58 and the inner cover plate 36 are connected to handles. The bottom of the door holes at the bottom of the outer cover plate 51 and the inner cover plate 41 are flush with the upper end face of the I-beam 15 below.

[0030] In use, the lower water supply header is connected to an inlet pipe, and the upper water supply header 8 is connected to an outlet pipe. High-pressure water flows sequentially through the lower water supply header, the heat exchange tube bundle 9, and the upper water supply header 8, where it undergoes counter-current heat exchange with the high-temperature compressed air introduced through the air inlet pipe seat 11. The cooled air bypasses the tube bundle support plate 6 and the tube bundle side sealing plate 7, flips upward, and flows out through the air outlet on the outer cylinder. The temperature inside the outer casing is lower than that inside the inner casing. After the inner liner tube 12 expands due to heat, its lower end contacts the inner wall of the sealing ring 49, resulting in a good sealing effect. This device does not use an expansion joint, and its structure is relatively simple and easy to manufacture. The inner casing 4... Both the inner and outer casings 4 and the outer casing 5 are mounted on the H-beam 13 via their respective angle steel columns, and their upper ends can expand freely. The sealing ring 49 can slide freely along the axial direction of the inner liner tube 12 as the temperature changes, and the sealing ring 54 can slide freely along the axial direction of the air inlet pipe seat 11, both of which reduce thermal stress. When the high-temperature compressed air enters the inner casing 4, it expands in volume. The several annular grooves 40 on the inner wall of the sealing ring 49 can realize the gradual expansion and depressurization of the gas, blocking the expansion of the high-temperature air to the outer space of the top plate 46 of the inner casing, avoiding the diffusion of the high-temperature air to the area between the inner and outer casings, reducing leakage, and achieving a seal at the connection.

[0031] The inner casing 4 is a high-temperature zone and is prone to deformation. Through bolts passing through the elongated holes 46, the inner casing cone plate 45 can slide on the surface of the inclined pad 44 due to temperature changes. Similarly, because the bolts passing through the elongated holes and the round holes of both are connected, the inner casing upright plate 41 can slide along the surface of the inner casing angle steel column 43 due to temperature changes. In addition, the expansion grooves 47 can reduce the thermal stress during temperature changes, thus preventing the inner casing from deforming, warping, and cracking due to temperature changes. Similarly, the outer casing upright plate 51, which has a lower temperature, is connected to the outer casing angle steel column 55 through bolts passing through the corresponding elongated holes. The outer casing upright plate 51 can also slide relative to the outer casing angle steel column 55 due to temperature changes, reducing thermal stress and preventing deformation and warping due to temperature changes.

[0032] Since there are no other components between the inner and outer shells, their gap can be adjusted, ensuring no air convection between them, reducing heat conduction, and guaranteeing air insulation effect. The components of the inner and outer shells are connected to form a seal. The inspection holes of the inner and outer shell uprights are through their inner cover plate 36 or outer cover plate 58, realizing a double-layer structure throughout the entire process. This not only facilitates installation but also increases maintenance space. The thermal insulation layer between the double-layer plates avoids convective heat transfer between the inner and outer shells and heat conduction between the frame plates, eliminating heat dissipation at this point, reducing high-temperature heat dissipation points on the outer shell, and preventing reverse heating of the cooled air. In addition, the two heat insulation plates 14 and 16 form an air insulation layer inside the H-beam 13 and I-beam 15, preventing convective heat transfer and reducing the temperature on the outside of the H-beam 13 and I-beam 15, preventing reheating of the cooled air, and ensuring the efficiency of the cooler.

[0033] This device is not limited to the above embodiments. For example, the heat insulation plate 14 and the heat insulation plate 16 can also be welded and fixed to the outer side of the web of the H-beam 13 or the I-beam 15, and the same technical effect can be achieved. The above embodiments have been described, but it should be understood that the above embodiments are only for the purpose of illustration and explanation, and are not intended to limit the present invention to the scope of the described embodiments.

Claims

1. A heat-insulated flow guide device, comprising an outer cylinder, the outer cylinder including a connected cylinder body and an upper end cap, four lugs fixedly connected to the cylinder body, and an inner cover, an outer cover, two tube bundle support plates, two tube bundle side sealing plates, a connected upper water supply header, a heat exchange tube bundle, and a lower water supply header inside the outer cylinder; the upper end cap is fixedly connected to an air inlet pipe seat; characterized in that: The lower section of the inner hole of the air inlet pipe seat is provided with an enlarged section, and an inner liner pipe is fixedly connected inside the enlarged section; steel beams are fixedly connected to the two lugs in the same group, and the two steel beams are fixedly connected by two connecting beams; one end of the upper water supply header is connected to a connecting beam, and its other end passes through another connecting beam and the cylinder and is fixedly connected to the cylinder; the two tube bundle support plates are fixedly connected to the lower ends of the two steel beams, and the two tube bundle side sealing plates are fixedly connected to the lower ends of the two connecting beams; the heat exchange tube bundle is placed between the two tube bundle support plates and the two tube bundle side sealing plates; the outer shell includes outer shell vertical plates and outer shell conical plates located on the four sides and fixedly connected, and the outer shell conical plates are all fixedly connected to the outer shell top plate; a sealing ring is fixedly connected in the central hole of the outer shell top plate, and the lower end of the air inlet pipe seat is embedded in the sealing ring and in contact with the inner wall of the sealing ring; the four outer shell vertical plates are connected to the outer shell angle steel columns located at the four corners by several bolts, and the outer shell angle steel columns are all connected to the steel beams below. The outer shell is fixedly connected to the steel beam; the inner shell includes inner shell uprights on four sides, and vertical pads fixedly connected to the inner upper side of each inner shell upright. The four inner shell uprights and the inner shell angle steel columns at the four corners are fixedly connected by bolts passing through an elongated hole in one of the uprights and a round hole in the other. The inner shell angle steel columns are fixedly connected to the steel beam below, and the inner shell uprights are in contact with the steel beam; four inclined pads are fixedly connected to the upper ends of the inner shell angle steel columns and vertical pads on the same side. Each inclined pad and its respective inner shell cone plate are fixedly connected by bolts passing through an elongated hole in one of the uprights and a round hole in the other. Each inner shell cone plate is fixedly connected to the inner shell top plate. A sealing ring is fixedly connected in the central hole of the inner shell top plate. The inner wall of the sealing ring is provided with several annular grooves, and the lower end of the inner liner is embedded in the sealing ring; both the inner shell uprights and the outer shell uprights on the same side are provided with inspection holes.

2. The heat-insulating flow guide device as described in claim 1, characterized in that: The inner and outer surfaces of the inner casing cone plate are provided with several expansion grooves.

3. A heat-insulating flow guide device as described in claim 1 or 2, characterized in that: The inspection hole of the outer cover plate includes a door hole located at the bottom of the outer cover plate, two vertical door panels and a horizontal door panel fixedly connected to the outer cover plate along the edge of the door hole, and an outer cover plate connected to the two vertical door panels and the horizontal door panel by several bolts.

4. The heat-insulating flow guide device as described in claim 3, characterized in that: The inspection hole of the inner cover plate includes a door hole located at the bottom of the inner cover plate, two vertical frame plates and a horizontal frame plate fixedly connected to the inner cover plate along the edge of the door hole, a pad plate fixedly connected to the inner side of the two vertical frame plates and the horizontal frame plate, and an inner cover plate connected to the three pad plates by several bolts.

5. The heat-insulating flow guide device as described in claim 4, characterized in that: The outer casing angle steel column has several round holes, and the outer casing plate has several oblong holes. The four outer casing plates are connected to the outer casing angle steel columns located at the four corners by bolts passing through the corresponding oblong holes and round holes.

6. The heat-insulating flow guide device as described in claim 5, characterized in that: Both steel beams are H-shaped steel beams, and heat insulation plates are fixed to the inner or outer side of the web of the H-shaped steel beams.

7. The heat-insulating flow guide device as described in claim 6, characterized in that: Both connecting beams are I-beams, and heat insulation plates are fixed to the inner or outer sides of the web of the I-beams.

8. The heat-insulating flow guide device as described in claim 7, characterized in that: The inner cover plate has a double-layer structure with a heat insulation layer between the two layers.

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