Assembled centripetal expansion machine

Abstract

The embodiment of the utility model discloses an assembly type centripetal expansion machine which is characterized in that the assembly type centripetal expansion machine comprises a main gear supporting bearing set, a large gear box, a first-stage turbine assembly and a second-stage turbine assembly, the main gear supporting bearing set comprises a gear end and a connecting end, the gear end is connected with the large gear box, and the large gear box is connected with the first-stage turbine assembly and the second-stage turbine assembly. The assembled centripetal expansion machine is connected to an external assembly through the connecting end, and the gear end extends into a large gear box. In the using process, tail gas preferentially enters the first-stage turbine assembly, the enthalpy value of the tail gas in the first-stage turbine assembly is reduced, the tail gas is converted into mechanical energy, then the tail gas enters the second-stage turbine assembly, the enthalpy value of the tail gas in the second-stage turbine assembly is further reduced, the tail gas is converted into mechanical energy, and then the tail gas is discharged from the second-stage turbine assembly. According to the technical scheme, by means of the turbine assemblies arranged in a grading mode, tail gas with the high enthalpy value can be treated, the enthalpy value in the tail gas is fully utilized, and the energy utilization rate is increased.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of expanders, and in particular, to an assembled centripetal expander. Background Art

[0002] The assembled centripetal expander is an energy recovery centripetal turbine, mainly used in the tail gas recovery turbines of medium and small PTA plants. However, with the gradual increase in the scale of single-line PTA plants, the scale of existing assembled centripetal turbines can no longer meet the market development needs, and it is urgent to develop a large-scale energy recovery turbine to replace medium and small centripetal turbines. Summary of the Utility Model

[0003] The present utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, the present utility model provides an assembled centripetal expander, including:

[0005] A main gear support bearing group, the main gear support bearing group having a connection end and a gear end, wherein the connection end is connected to an external component;

[0006] A large gearbox, the gear end of the main gear support bearing group being disposed inside the large gearbox;

[0007] A first-stage turbine assembly, the first-stage turbine assembly being connected to the large gearbox;

[0008] A second-stage turbine assembly, the second-stage turbine assembly being connected to the large gearbox, the second-stage turbine assembly being communicated with the first-stage turbine assembly;

[0009] Wherein, during the tail gas treatment process, the tail gas first enters the first-stage turbine assembly, and after passing through the first-stage turbine assembly, the tail gas then enters the second-stage turbine assembly.

[0010] In a feasible embodiment, the first-stage turbine assembly includes a first impeller;

[0011] The second-stage turbine assembly includes a second impeller;

[0012] Wherein, the first impeller and the second impeller are semi-open three-dimensional impellers.

[0013] In a feasible embodiment, the large gearbox includes:

[0014] An installation box, the gear end of the main gear support bearing group being disposed inside the installation box;

[0015] A first gear bearing group, the first gear bearing group being connected to the first-stage turbine assembly;

[0016] The second gear bearing set, which is connected to the secondary turbine assembly.

[0017] In a feasible implementation, the gear end of the main gear support bearing set meshes with the first gear bearing set and the second gear bearing set;

[0018] The first gear bearing set and the second gear bearing set are adjusted to the same output power through the main gear support bearing set.

[0019] In a feasible implementation, the primary turbine assembly includes:

[0020] A first end flange, through which the primary turbine assembly is connected to the large gearbox;

[0021] A first volute, which is connected to the first end flange;

[0022] A first ring, which is connected to the first volute;

[0023] A first rotor, which is arranged inside the first ring, and the first impeller is connected to the first rotor;

[0024] A first outlet reducer pipe, which is connected to the first volute through the first ring, and the first rotor is arranged inside the first outlet reducer pipe.

[0025] In a feasible implementation, the primary turbine assembly further includes:

[0026] A first shaft end abradable seal, which is arranged between the first end flange and the large gearbox.

[0027] In a feasible implementation, the secondary turbine assembly further includes:

[0028] A second end flange, through which the secondary turbine assembly is connected to the large gearbox;

[0029] A second volute, which is connected to the second end flange;

[0030] A second ring, which is arranged on the second volute;

[0031] A second rotor, which is arranged inside the second ring, and the second impeller is connected to the second rotor;

[0032] A second outlet reducer pipe, which is connected to the second volute through the second ring, and the second rotor is arranged inside the second outlet reducer pipe.

[0033] In a feasible embodiment, the secondary turbine assembly further includes:

[0034] A second shaft end abradable seal, which is arranged between the large gearbox and the second end flange.

[0035] In a feasible embodiment, the primary turbine assembly further includes:

[0036] A first nozzle regulating structure, which is arranged at the air outlet end of the first volute.

[0037] In a feasible embodiment, the first nozzle regulating structure adopts a back-type regulating structure.

[0038] Compared with the prior art, the present utility model has at least the following beneficial effects: The assembled centripetal expander provided in the embodiments of the present application is characterized in that the assembled centripetal expander includes a main gear support bearing group, a large gearbox, a primary turbine assembly and a secondary turbine assembly. Among them, the main gear support bearing group includes a gear end and a connection end. The assembled centripetal expander of the present application is connected to an external component through the connection end, and the gear end extends into the large gearbox. Among them, the primary turbine assembly is connected to the large gearbox, the secondary turbine assembly is connected to the large gearbox, and the primary turbine assembly and the secondary turbine assembly drive the main gear support bearing group through the large gearbox. During use, the tail gas first enters the primary turbine assembly, and the enthalpy value of the tail gas decreases and is converted into mechanical energy in the primary turbine assembly. Subsequently, the tail gas enters the secondary turbine assembly, and the enthalpy value of the tail gas further decreases and is converted into mechanical energy inside the secondary turbine assembly. Subsequently, the tail gas is discharged from the secondary turbine assembly. Through the turbine assemblies arranged in stages, the technical solution of the present application can process tail gas with a high enthalpy value, make full use of the enthalpy value in the tail gas, improve the energy utilization rate, and reduce the consumption of production resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0040] Figure 1 It is a top view sectional structure block diagram of an assembled centripetal expander according to an embodiment provided by the present application;

[0041] Figure 2 It is a front view structure block diagram of an assembled centripetal expander according to an embodiment provided by the present application;

[0042] Figure 3Side view structural block diagram of an assembled centripetal expander provided by this application.

[0043] Among them, Figures 1-3 The corresponding relationship between the reference numerals and the component names in the figure is as follows:

[0044] 100, main gear support bearing group; 200, large gearbox; 300, first-stage turbine assembly; 400, second-stage turbine assembly;

[0045] 210, mounting box; 220, first gear bearing group; 230, second gear bearing group;

[0046] 310, first end flange; 320, first volute; 330, first ring; 340, first rotor; 350, first outlet reducer; 360, first shaft end wearable seal; 370, first nozzle adjustment structure;

[0047] 410, second end flange; 420, second volute; 430, second ring; 440, second rotor; 450, second outlet reducer; 460, second shaft end wearable seal. Detailed implementation mode

[0048] In order to better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of this application and the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. Without conflict, the technical features in the embodiments of this application and the embodiments can be combined with each other.

[0049] As Figures 1-3 shown, an assembled centripetal expander is proposed according to an embodiment of this application, including: a main gear support bearing group 100, the main gear support bearing group 100 having a connection end and a gear end, wherein the connection end is connected to an external component; a large gearbox 200, the gear end of the main gear support bearing group 100 being disposed inside the large gearbox 200; a first-stage turbine assembly 300, the first-stage turbine assembly 300 being connected to the large gearbox 200; a second-stage turbine assembly 400, the second-stage turbine assembly 400 being connected to the large gearbox 200, the second-stage turbine assembly 400 being communicated with the first-stage turbine assembly 300; wherein, during the tail gas treatment process, the tail gas first enters the first-stage turbine assembly 300, and after passing through the first-stage turbine assembly 300, the tail gas then enters the second-stage turbine assembly 400.

[0050] The assembled centripetal expander provided by the embodiment of the present application is characterized in that the assembled centripetal expander includes a main gear support bearing group 100, a large gearbox 200, a first-stage turbine assembly 300 and a second-stage turbine assembly 400. Among them, the main gear support bearing group 100 includes a gear end and a connection end. The assembled centripetal expander is connected to an external component through the connection end, and the gear end extends into the large gearbox 200.

[0051] Among them, the first-stage turbine assembly 300 is connected to the large gearbox 200, the second-stage turbine assembly 400 is connected to the large gearbox 200, and the first-stage turbine assembly 300 and the second-stage turbine assembly 400 drive the main gear support bearing group 100 in the large gearbox 200.

[0052] During use, the tail gas first enters the first-stage turbine assembly 300. The enthalpy value of the tail gas decreases in the first-stage turbine assembly 300 and is converted into mechanical energy. Subsequently, the tail gas enters the second-stage turbine assembly 400. The enthalpy value of the tail gas further decreases inside the second-stage turbine assembly 400 and is converted into mechanical energy. Subsequently, the tail gas is discharged from the second-stage turbine assembly 400. The first-stage turbine assembly 300 and the second-stage turbine assembly 400 drive the gear end of the main gear support bearing group 100 to rotate. The connection end of the main gear support bearing group 100 is connected to an external generator, and the gear end of the main gear support bearing group 100 drives the external generator to generate electricity.

[0053] Through the turbine assemblies arranged in stages in this technical solution, tail gas with a high enthalpy value can be processed, and the enthalpy value in the tail gas can be fully utilized, improving the energy utilization rate and reducing the consumption of production resources.

[0054] As Figures 1-3 shown, the first-stage turbine assembly 300 includes a first impeller; the second-stage turbine assembly 400 includes a second impeller; among them, the first impeller and the second impeller are semi-open three-dimensional impellers.

[0055] In this technical solution, the first-stage turbine assembly 300 includes a first impeller, and the tail gas enters the first-stage turbine assembly 300 to do work on the first impeller. The second-stage turbine assembly 400 includes a second impeller, and the tail gas enters the second-stage turbine assembly 400 to do work on the second impeller.

[0056] Among them, the first impeller and the second impeller adopt semi-open three-dimensional impellers. These impellers have a large flow coefficient, a wide Mach number range, and a high power generation efficiency, further effectively improving the efficiency of the unit.

[0057] As Figures 1-3As shown in the figure, the large gearbox 200 includes: an installation box 210, and the gear end of the main gear support bearing group 100 is arranged inside the installation box 210; a first gear bearing group 220, and the first gear bearing group 220 is connected to the first-stage turbine assembly 300; a second gear bearing group 230, and the second gear bearing group 230 is connected to the second-stage turbine assembly 400.

[0058] As Figures 1-3 shown in the figure, the gear end of the main gear support bearing group 100 meshes with the first gear bearing group 220 and the second gear bearing group 230; the first gear bearing group 220 and the second gear bearing group 230 are adjusted to the same output power through the main gear support bearing group 100.

[0059] In this technical solution, the first gear bearing group 220 and the second gear bearing group 230 are arranged inside the installation box 210. The first gear bearing group 220 is connected to the first-stage turbine assembly 300, and the second gear bearing group 230 is connected to the second-stage turbine assembly 400.

[0060] During actual use, the first gear bearing group 220 is linked with the first impeller, and the second gear bearing group 230 is linked with the second impeller. The first impeller and the second impeller are driven by the exhaust gas to rotate. The first gear bearing group 220 and the second gear bearing group 230 are driven by the first impeller and the second impeller to rotate. The first gear bearing group 220 and the second gear bearing group 230 drive the gear end of the main gear support bearing group 100, and the gear end drives the connection end connected to the external generator, and the connection end drives the external generator to generate electricity, thereby realizing the conversion of the enthalpy value in the exhaust gas into mechanical energy and realizing energy recovery.

[0061] As Figures 1-3 shown in the figure, the first-stage turbine assembly 300 includes: a first end flange 310, and the first-stage turbine assembly 300 is connected to the large gearbox 200 through the first end flange 310; a first volute 320, and the first volute 320 is connected to the first end flange 310; a first ring 330, and the first ring 330 is connected to the first volute 320; a first rotor 340, and the first rotor 340 is arranged inside the first ring 330, and the first impeller is connected to the first rotor 340; a first outlet reducer 350, and the first outlet reducer 350 is connected to the first volute 320 through the first ring 330, and the first rotor 340 is arranged inside the first outlet reducer 350.

[0062] In this technical solution, the first-stage turbine assembly 300 includes a first-end flange 310, a first volute 320, a first shroud 330, a first rotor 340, and a first outlet reducer 350. Among them, the first impeller is connected to the first rotor 340. It can be understood that the first rotor 340 is simultaneously connected to the first gear bearing set 220.

[0063] During operation, the exhaust gas enters from the inlet of the first volute 320, passes through the first shroud 330 and enters the first rotor 340, and does work on the first impeller, pushing the first rotor 340 to rotate. After the enthalpy value of the exhaust gas decreases, the gas is discharged through the first outlet reducer 350 and then enters the second-stage turbine assembly 400 to do work.

[0064] As Figures 1-3 shown, the first-stage turbine assembly 300 further includes: a first shaft end wearing seal 360, and the first shaft end wearing seal 360 is arranged between the first-end flange 310 and the large gearbox 200.

[0065] In this technical solution, the first-stage turbine assembly 300 further includes a first shaft end wearing seal 360, and the first shaft end wearing seal 360 is arranged between the first-end flange 310 and the large gearbox 200, which avoids wear of the first-stage turbine assembly 300 during operation and extends the service life of this expander.

[0066] As Figures 1-3 shown, the second-stage turbine assembly 400 further includes: a second-end flange 410, and the second turbine assembly is connected to the large gearbox 200 through the second-end flange 410; a second volute 420, and the second volute 420 is connected to the second-end flange 410; a second shroud 430, and the second shroud 430 is arranged in the second volute 420; a second rotor 440, and the second rotor 440 is arranged inside the second shroud 430, and the second impeller is connected to the second rotor 440; a second outlet reducer 450, and the second outlet reducer 450 is connected to the second volute 420 through the second shroud 430, and the second rotor 440 is arranged inside the second outlet reducer 450.

[0067] In this technical solution, the second-stage turbine assembly 400 includes a second-end flange 410, a second volute 420, a second shroud 430, a second rotor 440, and a second outlet reducer 450. Among them, the second rotor 440 is connected to the second impeller. It can be understood that the second impeller is simultaneously connected to the second gear bearing set 230. The exhaust gas enters from the input port of the second volute 420, passes through the second shroud 430 and enters the second rotor 440, and pushes the second rotor 440 to rotate and do work. Subsequently, the gas with a reduced enthalpy value is discharged from the second-stage turbine assembly through the second outlet reducer 450, and the energy recovery of the exhaust gas ends here.

[0068] As shown Figures 1-3 in FIG. 2, the secondary turbine assembly 400 further includes: a second shaft end abradable seal 460, which is disposed between the large gearbox 200 and the second end flange 410.

[0069] In this technical solution, the secondary turbine assembly 400 further includes a second shaft end abradable seal 460. The second abradable seal is disposed between the large gearbox 200 and the second end flange 410. When the secondary turbine assembly 400 wears, the service life of the secondary turbine assembly 400 is increased.

[0070] As shown Figures 1-3 in FIG. 3, the primary turbine assembly 300 further includes: a first nozzle adjustment structure 370, which is disposed at the gas outlet end of the first volute 320.

[0071] In this technical solution, the primary turbine assembly 300 further includes a first nozzle adjustment structure 370. The first nozzle adjustment structure 370 is disposed at the gas outlet end of the first volute 320 and is used to adjust the pressure, flow rate, etc. of the exhaust gas ejected from the first volute 320.

[0072] As shown Figures 1-3 in FIG. 4, the first nozzle adjustment structure 370 adopts a back-type adjustment structure.

[0073] In this technical solution, the back-type adjustment structure removes the nozzle housing structure, broadens the flow range of the unit, and at the same time reduces the structural size of the first volute 320, effectively reducing the cost and floor area of the unit.

[0074] In the present utility model, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", and "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0075] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation of the present utility model.

[0076] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0077] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An assembled centripetal expander, characterized in that, Comprising: A main gear support bearing group, the main gear support bearing group having a connection end and a gear end, wherein the connection end is connected to an external component; A large gearbox, the gear end of the main gear support bearing group being disposed inside the large gearbox; A first-stage turbine assembly, the first-stage turbine assembly being connected to the large gearbox; A second-stage turbine assembly, the second-stage turbine assembly being connected to the large gearbox, the second-stage turbine assembly being in communication with the first-stage turbine assembly; Wherein, during the tail gas treatment process, the tail gas first enters the first-stage turbine assembly, and after passing through the first-stage turbine assembly, the tail gas then enters the second-stage turbine assembly.

2. The assembled centripetal expander according to claim 1, wherein: The first-stage turbine assembly includes a first impeller; The second-stage turbine assembly includes a second impeller; Wherein, the first impeller and the second impeller are semi-open three-dimensional impellers.

3. The assembled centripetal expander according to claim 1, characterized in that, The large gearbox includes: An installation box, the gear end of the main gear support bearing group being disposed inside the installation box; A first gear bearing group, the first gear bearing group being connected to the first-stage turbine assembly; A second gear bearing group, the second gear bearing group being connected to the second-stage turbine assembly.

4. The assembled centripetal expander according to claim 3, wherein: The gear end of the main gear support bearing group meshes with the first gear bearing group and the second gear bearing group; The first gear bearing group and the second gear bearing group are adjusted to the same output power through the main gear support bearing group.

5. The assembled centripetal expander according to claim 2, characterized in that, The first-stage turbine assembly includes: A first end flange, the first-stage turbine assembly being connected to the large gearbox through the first end flange; A first volute, the first volute being connected to the first end flange; A first ring, the first ring being connected to the first volute; A first rotor, the first rotor being disposed inside the first ring, the first impeller being connected to the first rotor; A first outlet reducer pipe, the first outlet reducer pipe being connected to the first volute through the first ring, the first rotor being disposed inside the first outlet reducer pipe.

6. The assembled centripetal expander according to claim 5, wherein, The first-stage turbine assembly further includes: A first shaft end abradable seal, the first shaft end abradable seal being disposed between the first end flange and the large gearbox.

7. The assembled centripetal expander according to claim 2, wherein The second-stage turbine assembly further includes: A second end flange, the second-stage turbine assembly being connected to the large gearbox through the second end flange; A second volute, the second volute being connected to the second end flange; A second ring, the second ring being disposed in the second volute; A second rotor, the second rotor being disposed inside the second ring, the second impeller being connected to the second rotor; A second outlet reducer pipe, the second outlet reducer pipe being connected to the second volute through the second ring, the second rotor being disposed inside the second outlet reducer pipe.

8. The assembled centripetal expander according to claim 7, wherein, The second-stage turbine assembly further includes: A second shaft end abradable seal, the second shaft end abradable seal being disposed between the large gearbox and the second end flange.

9. The assembled centripetal expander according to claim 5, wherein, The first-stage turbine assembly further includes: A first nozzle adjustment structure, the first nozzle adjustment structure being disposed at the gas outlet end of the first volute.

10. The assembled centripetal expander according to claim 9, wherein: The first nozzle adjustment structure adopts a back-type adjustment structure.

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