Flange cone of exhaust casing of flue gas turbine

Abstract

The invention discloses a flange cone of a flue gas turbine exhaust shell. The flange cone comprises a connecting ring, a cone sleeve, a support lug and a guide key, wherein the small end of the cone sleeve is fixedly mounted on one side of the connecting ring; the guide key is fixedly installed on the outer circle of the connecting ring, and the axis of the guide key is parallel to the axis of the connecting ring. The two supporting lugs are symmetrically arranged on the two sides of the connecting ring. The large end face of the conical sleeve is an inclined face. The method has the beneficial effects that the flange cone is reasonably decomposed, blanks of all parts are prepared through the forging technology, the machining and manufacturing period is shortened, and the quality of the blanks is guaranteed; machining is facilitated, the machining precision is guaranteed, and the machining efficiency of all parts is improved; the flange cone is assembled through the welding process, the product percent of pass is increased, and the manufacturing cost is effectively reduced; the flange cone strength is improved, the normal running period of the flue gas turbine is prolonged, and the running reliability of the flue gas turbine is improved.

Description

Technical Field

[0001] The invention relates to a flue gas turbine exhaust casing, in particular to a flange cone of a flue gas turbine exhaust casing, belonging to the technical field of petrochemical equipment. Background Art

[0002] The YL flue gas turbine is a key equipment of the main air unit of the catalytic cracking unit of the refinery. It is used to recover the energy in the high-temperature flue gas generated by the regenerator. The length of its operation cycle and the stability of its operation are not only related to the energy consumption of the catalytic cracking unit, but also affect whether the catalytic unit of the refinery can produce normally. The main function of the exhaust casing of the YL series flue gas turbine is to guide the flue gas after the work is done by the moving blades into the exhaust duct of the device, and play the role of connecting the flue gas turbine and the exhaust duct. The flange cone in the exhaust casing of the flue gas turbine (such as Figure 1 The flange cone (as shown in the figure) is a special-shaped part with a complex structure. Currently, the blank is prepared by casting technology. Before casting, a wooden model needs to be made first, and then the workpiece blank is cast. There are the following problems in processing the blank into the flange cone finished product: the flange cone has an asymmetric structure and a long model production cycle; due to the large difference in wall thickness of the flange cone, defects are easily generated at high temperatures, the blank quality is unstable, and the scrap rate is high; the casting processing allowance is large, the processing difficulty is increased, and the production cycle is long, resulting in increased manufacturing costs. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the existing method of producing flange cones by using a casting process to prepare blanks, the present invention provides a flange cone for an exhaust casing of a flue gas turbine.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a flange cone of a flue gas turbine exhaust casing, including a flange cone, wherein the flange cone includes a connecting ring, a cone sleeve, a support ear, and a guide key, wherein the small end of the cone sleeve is fixedly installed on one side of the connecting ring; the guide key is fixedly installed on the outer circle of the connecting ring, and the axis of the guide key is parallel to the axis of the connecting ring; and two support ears are symmetrically arranged on both sides of the connecting ring.

[0005] The large end surface of the tapered sleeve is an inclined surface.

[0006] The extended line of the long side of the tapered sleeve and the guide key are respectively located at the upper and lower ends of the outer circumference of the connecting ring at an interval of 180 degrees.

[0007] The ears on both sides of the connecting ring are arranged horizontally, and the lower planes of the ears coincide with the horizontal symmetry axis of the connecting ring.

[0008] A positioning groove I of a guide key is arranged on the other side of the connecting ring corresponding to the long side of the tapered sleeve, and a positioning boss of the guide key is installed in the positioning groove I.

[0009] The outer circumference of the connecting ring is provided with a positioning groove II for the support ear, and the positioning boss at the end of the support ear is located in the positioning groove II.

[0010] Support ribs are installed on both sides of the support ears, and the support ribs are fixedly connected to the support ears and the connecting rings.

[0011] The convex stopper at the small end of the tapered sleeve is arranged in the concave stopper at one end of the connecting ring, and the tapered sleeve and the connecting ring are fixedly connected by a welding process.

[0012] The blanks of the connecting ring, the lug, the guide key and the supporting rib are processed by forging technology; the cone sleeve is processed by riveting and welding technology using steel plates.

[0013] After the flange cone is assembled, the large end inclined surface of the cone sleeve is processed.

[0014] The beneficial effects of the present invention are as follows: by rationally decomposing the flange cone, the forging process is adopted to prepare the blanks of each component, thereby shortening the processing and manufacturing cycle and ensuring the quality of the blank; facilitating mechanical processing, ensuring processing accuracy and improving the processing efficiency of each component; adopting the welding process to assemble the flange cone, improving the product qualification rate and effectively reducing the manufacturing cost; improving the strength of the flange cone, extending the normal operation cycle of the flue gas turbine and improving the operating reliability of the flue gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a flange cone integrally cast in the prior art.

[0016] Figure 2 It is a schematic diagram of the flange cone structure of the exhaust casing of the flue gas turbine of the present invention.

[0017] Figure 3 yes Figure 2 Left view of .

[0018] In the figure: 1. connecting ring, 2. tapered sleeve, 3. support ear, 4. guide key, 5. supporting rib plate, 6. inclined surface, 7. long side, 8. positioning groove I, 9. positioning groove II, 10. flange cone, 11. short side. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and all embodiments should be included in the protection scope of the present invention as long as they conform to the spirit of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing or simplifying the description of the present invention, rather than indicating or implying 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 a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See attached Figure 2 , 3 The present invention discloses a flange cone of an exhaust casing of a flue gas turbine. The flange cone 10 comprises a connecting ring 1, a cone sleeve 2, a support ear 3, a guide key 4, and a supporting rib 5. The small end of the cone sleeve 2 is fixedly mounted on one side of the connecting ring 1; the guide key 4 is fixedly mounted on the outer circle of the connecting ring 1, and the axis of the guide key 4 is parallel to the axis of the connecting ring 1; and two support ears 3 are symmetrically arranged on both sides of the connecting ring 1. The connecting ring 1, cone sleeve 2, support ear 3, and guide key 4 are connected and assembled to form the flange cone 10 after being processed separately.

[0023] The large end surface of the tapered sleeve 2 is a slope 6 .

[0024] The extended line of the long side 7 of the tapered sleeve 2 and the guide key 4 are respectively located at the upper and lower ends of the outer circumference of the connecting ring 1 at an interval of 180°. Preferably, the guide key 4 is located on the extended line of the short side 11 of the tapered sleeve 2.

[0025] The ears 3 on both sides of the connecting ring 1 are arranged horizontally, and the lower plane of the ears 3 coincides with the horizontal symmetry axis (horizontal diameter line) of the connecting ring 1 .

[0026] The axis of the connecting ring 1 is arranged horizontally, the long side 7 of the tapered sleeve 2 is located at the upper end of the connecting ring 1, the guide key 4 is located at the lower end of the connecting ring 1, and the two ears 3 are located on both sides of the connecting ring 1 (such as Figure 3 shown).

[0027] A positioning groove Ⅰ8 of the guide key 4 is arranged on the other side of the connecting ring 1 corresponding to the long side 7 of the tapered sleeve 2 , and a positioning boss is arranged at the bottom of the guide key 4 , and the positioning boss of the guide key 4 is installed in the positioning groove Ⅰ8 .

[0028] The outer circumference of the connecting ring 1 is provided with a positioning groove II9 for the support ear 3, and the positioning boss at the end of the support ear 3 is located in the positioning groove II9. Preferably, the positioning groove I8 and the positioning groove II9 have the same size for easy processing.

[0029] Support ribs 5 are installed on both sides of the support ear 3 , and the support ribs 5 are fixedly connected to the support ear 3 and the connecting ring 1 .

[0030] The small end of the cone sleeve 2 is provided with a convex stop, and one end of the connecting ring 1 is provided with a concave stop. The convex stop of the cone sleeve 2 is arranged in the concave stop of the connecting ring 1, and the cone sleeve 2 and the connecting ring 1 are fixedly connected by welding technology.

[0031] The blank of the cone sleeve 2 is made of steel plate by riveting and welding, and then the convex stop at the small end is processed and then welded to the connecting ring 1.

[0032] The blanks of the connecting ring 1, the supporting lug 3, the guide key 4 and the supporting rib 5 are all made by forging technology and then machined to ensure the matching dimensions between the components.

[0033] Furthermore, the support ear 3, the guide key 4, the support rib plate 5 and the connecting ring 1 are fixedly connected by welding technology.

[0034] The conical sleeve 2 is in a right cone shape before the flange cone 10 is assembled, and the large and small end faces of the conical sleeve 2 are parallel. After the flange cone 10 is assembled, the large end bevel 6 of the conical sleeve 2 is processed. The processing of the bevel 6 ensures the position of the extension line of the long side 7 of the flange cone 10, the lug 3, the guide key 4, and the lug 3 along the circumference of the connecting ring 1.

[0035] The flange cone of the exhaust casing of the flue gas turbine of the present invention adopts a split design, which decomposes the original flange cone into five parts, and each part is processed separately, and the flange cone that meets the design requirements is assembled by welding; in order to ensure the overall performance index of the flange cone after welding and assembly, the weld is necessary to be tested to ensure the quality of the weld; considering the thermal deformation caused by welding, each part is processed according to the pre-designed size allowance during the rough processing process to ensure that the overall processing of the parts after combined welding removes the influence of welding deformation. The blanks of the parts abandon the traditional casting process and adopt forging and riveting welding processes to prepare the blanks, so that the mechanical properties of the parts at high temperatures are far better than those of the castings; each part is processed separately to reduce the difficulty of processing and ensure the processing quality.

[0036] Compared with the prior art, the split flange cone of the present invention has the following advantages:

[0037] 1. No need for casting, completely eliminating the defects of casting process;

[0038] 2. The blank is forged, and the mechanical properties of the flange cone at high temperature are much better than those of castings;

[0039] 3. Reduce the difficulty of mechanical processing, improve product quality, and shorten the production cycle.

[0040] 4. Extend the normal operation cycle of the flue gas turbine and improve the operating reliability of the flue gas turbine.

[0041] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A flange cone of a gas turbine exhaust housing, comprising a flange cone, Characterized in that: The flange cone includes a connecting ring, a tapered sleeve, lugs, and guide keys. The small end of the tapered sleeve is fixedly installed on one side of the connecting ring; the guide keys are fixedly installed on the outer circumference of the connecting ring, and the axis of the guide keys is parallel to the axis of the connecting ring; two lugs are symmetrically arranged on both sides of the connecting ring; the flange cone is assembled by the connecting ring, the tapered sleeve, the lugs, and the guide keys.

2. The flange cone of the gas turbine exhaust housing according to claim 1, Characterized in that: The large end face of the tapered sleeve is an inclined plane.

3. The flange cone of the gas turbine exhaust housing according to claim 2, Characterized in that: The extended lines of the long sides of the tapered sleeve and the guide keys are spaced 180° and are respectively located at the upper and lower ends of the outer circumference of the connecting ring.

4. The flange cone of the gas turbine exhaust housing according to claim 3, Characterized in that: The lugs on both sides of the connecting ring are horizontally arranged, and the lower plane of the lugs coincides with the horizontal symmetry axis of the connecting ring.

5. The flange cone of the gas turbine exhaust housing according to claim 4, Characterized in that: A positioning groove Ⅰ for the guide key is provided on the other side of the connecting ring corresponding to the long side of the tapered sleeve, and the positioning boss of the guide key is installed in the positioning groove Ⅰ.

6. The flange cone of the gas turbine exhaust housing according to claim 5, Characterized in that: A positioning groove Ⅱ for the lug is provided on the outer circumference of the connecting ring, and the positioning boss at the end of the lug is located in the positioning groove Ⅱ.

7. The flange cone of the gas turbine exhaust housing according to claim 6, Characterized in that: Support ribs are installed on both sides of the lug, and the support ribs are fixedly connected to the lug and the connecting ring.

8. The flange cone of the gas turbine exhaust housing according to any one of claims 1-7, Characterized in that: The convex stop of the small end of the tapered sleeve is arranged in the concave stop at one end of the connecting ring, and the tapered sleeve and the connecting ring are fixedly connected by a welding process.

9. The flange cone of the gas turbine exhaust housing according to claim 8, Characterized in that: The blanks of the connecting ring, the lugs, the guide keys, and the support ribs are processed by a forging process; the tapered sleeve is processed by a steel plate through a riveting and welding process.

10. The flange cone of the gas turbine exhaust housing according to claim 9, Characterized in that: The large end inclined plane of the tapered sleeve is processed after the flange cone is assembled.

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