WO2024066423A1

WO2024066423A1 - 15 mw transcritical carbon dioxide centrifugal compressor

Info

Publication number: WO2024066423A1
Application number: PCT/CN2023/096971
Authority: WO
Inventors: 徐殿吉; 徐鹏; 祝海义; 郭庆丰; 刘阳; 杨一鸣; 吕天昊; 翟彦恺; 张健; 李佳鹏; 景禹淇
Original assignee: 哈电发电设备国家工程研究中心有限公司; 哈尔滨汽轮机厂有限责任公司
Priority date: 2022-09-28
Filing date: 2023-05-30
Publication date: 2024-04-04
Also published as: CN115523163A

Abstract

A 15 MW transcritical CO₂ centrifugal compressor, comprising a gear box (1), a first-stage compressor (2), and a second-stage compressor (3). The output ends of both sides of the gear box (1) are respectively connected to the first-stage compressor (2) and the second-stage compressor (3), and a first-stage exhaust port (2-1) of the first-stage compressor (2) is connected to a second-stage air inlet (3-1) of the second-stage compressor (3) by means of an interstage pipe (4); the gear box (1) comprises a gear box housing (11), a compressor driving main shaft (12), and a driving motor shaft (13); the compressor driving main shaft (12) and the driving motor shaft (13) are rotatably mounted in the gear box housing (11), the compressor driving main shaft (12) is transmittingly connected to the driving motor shaft (13) by means of a transmission gear set (15), and the driving motor shaft (13) is connected to a driving motor.

Description

A 15MW transcritical carbon dioxide centrifugal compressor

Technical Field

The invention relates to a 15MW transcritical _CO2 centrifugal compressor, belonging to the technical field of mechanical manufacturing.

Background technique

Compressed CO2 energy storage is a new type of energy storage technology. The transcritical CO2 energy storage system has the advantages of high energy storage density, green and high efficiency, and is not restricted by geographical conditions, and has a good application prospect. At present, there is a blank in the field of energy storage for 15MW transcritical CO2 working fluid compressor products.

In other application fields, Chinese patent CN106151063A "A CO2 circulating gas compressor" is a CO2 circulating gas centrifugal compressor, which mainly includes: a main shaft, an impeller, a spacer, a thrust plate, a balancing plate, a diaphragm coupling, a diffuser, a returner, a bend, an inlet and outlet volute, a seal, a bearing assembly, and a housing, characterized in that: (1) four impellers are connected in series on the same main shaft, and the impellers are in a back-to-back form. The diameters of the outlets of the front impeller and the rear impeller are the same. Between two adjacent impellers, the blades of the rear impeller are set to be deflected at a certain angle relative to the blades of the front impeller; (2) the diffuser adopts a combination of a bladeless diffuser and a blade diffuser, with the bladeless diffuser in front and the blade diffuser in the back; (3) the partition of the compressor adopts an inlaid structure, and the rear partition is installed on the front partition on both sides of the balancing plate to form a combined partition; (4) the inlet and outlet volutes with reinforcing ribs on both sides of the partition are adopted; (5) the air intake method adopts a double-sided air intake and middle air outlet structure.

The working fluid of the centrifugal compressor of the above invention is toxic gas CO. The design has its own particularity and is not very universal. Different working fluids have different requirements for the internal structure of the compressor. In addition, the internal structure of the above invention is complex and the size is too large, which is not convenient for transportation, installation and maintenance. At the same time, the 4-stage compressor adopts a coaxial design, and the single-stage efficiency cannot be designed according to the optimal design, which affects the efficiency of the whole machine. A newly developed centrifugal compressor with transcritical _CO2 as the working fluid and transcritical _CO2 circulation technology can meet the application requirements of the _CO2 energy storage system, help fill the gap in transcritical _CO2 centrifugal compressor products, and improve the overall efficiency of the energy storage system.

Therefore, it is urgent to propose a new type of centrifugal compressor to solve the above technical problems.

technical problem

The purpose of the research and development of the present invention is to respond to market demand, fill the gap in 15MW-class _CO2 energy storage system compressor products, and solve the problems of existing multi-stage centrifugal compressors, complex internal structures, low efficiency, and inconvenient transportation, installation, and maintenance. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

Technical Solutions

The technical solution of the present invention:

A 15MW transcritical _CO2 centrifugal compressor, comprising a gearbox, a primary compressor and a secondary compressor, wherein the output ends of the gearbox are connected to the primary compressor and the secondary compressor respectively, and the primary exhaust port of the primary compressor is connected to the secondary air inlet of the secondary compressor through an interstage pipeline;

The gearbox includes a gearbox housing, a compressor drive main shaft and a drive motor shaft. The compressor drive main shaft and the drive motor shaft are rotatably installed in the gearbox housing. The compressor drive main shaft and the drive motor shaft establish a transmission connection relationship through a transmission gear set, and the drive motor shaft establishes a connection with the drive motor.

Preferably, the first-stage compressor and the second-stage compressor have the same structure.

Preferably: the first-stage compressor includes an impeller, a volute, an air seal body, a transition section and an inlet flange, the volute is fixedly mounted on one side of the gear box, the impeller is arranged inside the volute, the impeller is connected to the end of the compressor drive shaft, one side of the air seal body is fixedly connected to the volute through the inlet flange, the other side of the air seal body is fitted with the outer wall of the impeller, the middle through hole of the air seal body is connected to the middle air inlet of the inlet flange through the transition section, and together constitute the first-stage air inlet of the first-stage compressor.

Preferably, a dry gas sealing assembly is provided between the outer side wall of the end portion of the compressor driving main shaft and the inner side wall of the volute.

Preferably, the impeller is spline-connected to the end of the compressor driving main shaft and then fastened by tie rod bolts.

Preferably, the compressor driving main shaft is rotatably mounted in the gear box via a thrust support bearing.

Preferably: the secondary compressor is provided with a secondary exhaust port, and transcritical _CO2 is used as the working fluid. The working fluid enters the primary compressor through the primary air inlet, and then enters the secondary air inlet of the secondary compressor from the primary exhaust port through the interstage pipeline. The working fluid entering the secondary compressor is compressed and discharged into the molten salt heat exchanger through the secondary exhaust port.

Preferably, the gear box housing is fixedly connected to the base frame to be installed by anchor bolts.

Beneficial Effects

The technical solution of the present invention:

Preferably, the impeller is connected to the end of the compressor driving main shaft by a spline and then fastened by a tie rod bolt.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a 15MW transcritical CO ₂ centrifugal compressor;

FIG2 is a top view of a 15 MW transcritical CO ₂ centrifugal compressor;

FIG3 is a left side view of a 15 MW transcritical CO ₂ centrifugal compressor;

FIG4 is a right side view of a 15 MW transcritical CO ₂ centrifugal compressor;

FIG5 is a schematic diagram of the structure of a 15MW transcritical CO ₂ centrifugal compressor;

FIG6 is a schematic diagram of the structure of a gearbox of a 15MW transcritical _CO2 centrifugal compressor;

In the figure, 1-gearbox, 2-first-stage compressor, 3-second-stage compressor, 4-interstage pipeline, 2-1-first-stage exhaust port, 2-2-first-stage air inlet, 3-1-second-stage air inlet, 3-2-second-stage exhaust port, 11-gearbox housing, 12-compressor drive main shaft, 13-drive motor shaft, 14-thrust support bearing, 15-transmission gear set, 21-impeller, 22-volute, 23-gas seal body, 24-transition section, 25-inlet flange, 26-dry gas seal assembly, 27-pull rod bolt, 31-second-stage impeller, 32-second-stage volute, 33-second-stage gas seal body, 34-second-stage transition section, 35-second-stage inlet flange, 36-second-stage dry gas seal assembly, 37-second-stage pull rod bolt.

Embodiments of the present invention

In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: a fixed connection is a welding connection, and a detachable connection is a hinge connection.

Specific implementation method 1: This implementation method is described in conjunction with Figures 1 to 6. A 15MW transcritical _CO2 centrifugal compressor in this implementation method includes a gearbox 1, a primary compressor 2 and a secondary compressor 3. The output ends on both sides of the gearbox 1 are connected to the primary compressor 2 and the secondary compressor 3 respectively. The primary exhaust port 2-1 of the primary compressor 2 is connected to the secondary air inlet 3-1 of the secondary compressor 3 through an interstage pipeline 4.

The gearbox 1 includes a gearbox housing 11, a compressor drive main shaft 12 and a drive motor shaft 13. The compressor drive main shaft 12 is rotatably mounted in the gearbox 1 through a thrust support bearing 14, and the drive motor shaft 13 is rotatably mounted in the gearbox housing 11. The compressor drive main shaft 12 and the drive motor shaft 13 establish a transmission connection relationship through a transmission gear set 15. The transmission gear set 15 includes two meshing transmission gears, and the two meshing transmission gears are respectively mounted on the compressor drive main shaft 12 and the drive motor shaft 13. The drive motor shaft 13 is connected to the drive motor through a diaphragm coupling. The gearbox housing 11 is fixedly connected to the base frame to be installed through anchor bolts, and the drive motor provides power for the compression operation of the primary compressor 2 and the secondary compressor 3;

The primary compressor 2 and the secondary compressor 3 have the same structure.

The first-stage compressor 2 includes an impeller 21, a volute 22, a gas seal body 23, a transition section 24, an inlet flange 25, a dry gas seal assembly 26 and a tie rod bolt 27;

The two-stage compressor 3 includes a two-stage impeller 31, a two-stage volute 32, a two-stage gas seal body 33, a two-stage transition section 34, a two-stage inlet flange 35, a two-stage dry gas seal assembly 36 and a two-stage tie rod bolt 37;

The volute 22 and the secondary volute 32 are fixedly mounted on the left and right sides of the gearbox housing 11, respectively. The impeller 21 is arranged inside the volute 22, and the secondary impeller 31 is arranged inside the secondary volute 32. The impeller 21 is splined to one end of the compressor drive main shaft 12, and the torque is transmitted through the spline, and then fastened by the tie rod bolt 27. The secondary impeller 31 is splined to the other end of the compressor drive main shaft 12, and the torque is transmitted through the spline, and then fastened by the secondary tie rod bolt 37.

One side of the gas seal body 23 is fixedly connected to the volute 22 through the inlet flange 25, and the other side of the gas seal body 23 is in contact with the outer wall of the impeller 21. The middle through hole of the gas seal body 23 is connected to the middle air inlet of the inlet flange 25 through the transition section 24, together forming the first-stage air inlet 2-2 of the first-stage compressor 2. One side of the second-stage gas seal body 33 is fixedly connected to the second-stage volute 32 through the second-stage inlet flange 35, and the other side of the second-stage gas seal body 33 is in contact with the outer wall of the second-stage impeller 31. The middle through hole of the second-stage gas seal body 33 is connected to the middle air inlet of the second-stage inlet flange 35 through the second-stage transition section 34, together forming the second-stage air inlet 3-1 of the second-stage compressor 3.

A pneumatic regulating valve is provided on the first-stage air inlet 2-2 of the first-stage compressor 2 to meet the working condition adjustment requirements. A dry gas sealing assembly 26 is provided between the end outer wall of the compressor drive main shaft 12 and the inner wall of the volute 22, and the backs of the impeller 21 and the second-stage impeller 31 are both designed with back blades.

In this embodiment, all bearings including the thrust support bearing 14 are thrust support bearings, which can absorb the axial force of their respective shafts.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and/or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and/or combinations thereof.

Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

A 15MW transcritical carbon dioxide centrifugal compressor, characterized in that it comprises a gearbox (1), a first-stage compressor (2) and a second-stage compressor (3), wherein the output ends on both sides of the gearbox (1) are connected to the first-stage compressor (2) and the second-stage compressor (3) respectively, and the first-stage exhaust port (2-1) of the first-stage compressor (2) is connected to the second-stage air inlet (3-1) of the second-stage compressor (3) via an interstage pipeline (4);

The gearbox (1) comprises a gearbox housing (11), a compressor drive main shaft (12) and a drive motor shaft (13); the compressor drive main shaft (12) and the drive motor shaft (13) are rotatably mounted in the gearbox housing (11); the compressor drive main shaft (12) and the drive motor shaft (13) establish a transmission connection relationship via a transmission gear set (15); and the drive motor shaft (13) establishes a connection with the drive motor.
The 15 MW transcritical carbon dioxide centrifugal compressor according to claim 1, characterized in that the first-stage compressor (2) and the second-stage compressor (3) have the same structure.
A 15MW transcritical carbon dioxide centrifugal compressor according to claim 2, characterized in that: the first-stage compressor (2) comprises an impeller (21), a volute (22), a gas seal (23), a transition section (24) and an inlet flange (25), the volute (22) is fixedly mounted on one side of the gearbox (1), the impeller (21) is arranged inside the volute (22), the impeller (21) is connected to the end of the compressor drive main shaft (12), one side of the gas seal (23) is fixedly connected to the volute (22) through the inlet flange (25), the other side of the gas seal (23) is in contact with the outer wall of the impeller (21), the middle through hole of the gas seal (23) is connected to the middle air inlet of the inlet flange (25) through the transition section (24), and together constitute the first-stage air inlet (2-2) of the first-stage compressor (2).
A 15 MW transcritical carbon dioxide centrifugal compressor according to claim 3, characterized in that a dry gas sealing assembly (26) is provided between the outer side wall of the end of the compressor drive main shaft (12) and the inner side wall of the volute (22).
A 15 MW transcritical carbon dioxide centrifugal compressor according to claim 4, characterized in that the impeller (21) is spline-connected to the end of the compressor drive main shaft (12), and then fastened by a tie rod bolt (27).
A 15 MW transcritical carbon dioxide centrifugal compressor according to claim 1, characterized in that the compressor drive main shaft (12) is rotatably mounted in the gear box (1) through a thrust support bearing (14).
According to claim 1, a 15MW transcritical carbon dioxide centrifugal compressor is characterized in that: the secondary compressor (3) is provided with a secondary exhaust port (3-2), and transcritical CO2 is used as the working fluid. The working fluid enters the primary compressor (2) through the primary air inlet (2-2), and then enters the secondary air inlet (3-1) of the secondary compressor (3) from the primary exhaust port (2-1) through the interstage pipeline (4). The working fluid entering the secondary compressor (3) is compressed and then discharged into the molten salt heat exchanger through the secondary exhaust port (3-2).
The 15MW transcritical carbon dioxide centrifugal compressor according to claim 1 is characterized in that the gearbox housing (11) is fixedly connected to the base frame to be installed by anchor bolts.
The 15 MW transcritical carbon dioxide centrifugal compressor according to claim 7, characterized in that a pneumatic regulating valve is provided on the first-stage air inlet (2-2) of the first-stage compressor (2).