CN115324911A - Supercritical carbon dioxide compressor and coaxial power generation system - Google Patents
Supercritical carbon dioxide compressor and coaxial power generation system Download PDFInfo
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- CN115324911A CN115324911A CN202211244904.XA CN202211244904A CN115324911A CN 115324911 A CN115324911 A CN 115324911A CN 202211244904 A CN202211244904 A CN 202211244904A CN 115324911 A CN115324911 A CN 115324911A
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- dioxide compressor
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 64
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 64
- 238000010248 power generation Methods 0.000 title claims abstract description 22
- 230000000903 blocking effect Effects 0.000 claims abstract description 178
- 230000004888 barrier function Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 239000011295 pitch Substances 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/051—Axial thrust balancing
- F04D29/0513—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application relates to a supercritical carbon dioxide compressor and a coaxial power generation system, wherein the supercritical carbon dioxide compressor comprises a rotating shaft, a stator, a rotating wheel and a blocking assembly, the stator is arranged around the rotating shaft, and the stator and the rotating shaft are enclosed to form an accommodating cavity; the rotating wheel is arranged in the accommodating cavity and connected with the rotating shaft, and the accommodating cavity is divided into a first flow channel and a second flow channel by the rotating wheel in the axial direction of the rotating shaft; the blocking assembly is arranged in the second flow channel and comprises a first blocking piece and a second blocking piece, the first blocking piece is connected with the rotating wheel, the second blocking piece is connected with the stator, and the airflow in the second flow channel flows out after passing through the first blocking piece and the second blocking piece so that the pressures in the first flow channel and the second flow channel are balanced. According to the embodiment of the application, the pressure of the air flow in the second flow channel can be reduced, so that the pressure of the air flow in the second flow channel is balanced with the pressure of the air flow in the first flow channel, and the stability of the air compressor is maintained.
Description
Technical Field
The application relates to the technical field of impeller machinery, in particular to a supercritical carbon dioxide compressor and a coaxial power generation system.
Background
In recent years, a supercritical carbon dioxide power generation system has attracted much attention because of its compact structure, simple cycle system, high power generation efficiency, and the like.
The inlet pressure of the supercritical carbon dioxide compressor is close to the critical point (7.38 MPa, 31.1 ℃), and the outlet pressure is usually 14-20MPa according to the design, so that the axial thrust of a rotor acting on a rotating wheel of the compressor is too large due to the large pressure difference and the high pressure difference between the inlet and the outlet of the compressor, the development of a supercritical carbon dioxide power generation system is restricted, and the supercritical carbon dioxide compressor is one of the important characteristics of the supercritical carbon dioxide compressor different from the traditional gas compressor.
Usually, a balance piston sealing structure is adopted to generate reverse thrust to balance the thrust generated by the impeller, however, the introduction of the balance piston sealing structure can obviously increase the length of a rotor shaft system, so that the size and the weight of equipment such as a gas compressor and the like are greatly increased, and meanwhile, the overlong shaft system arrangement can greatly reduce the critical rotating speed of the rotor, so that the risk of critical instability exists.
Disclosure of Invention
The embodiment of the application provides a supercritical carbon dioxide compressor and a coaxial power generation system, and the pressure of air flow in a flow channel of the supercritical carbon dioxide compressor is reduced, so that the pressure difference between the front and the back of a runner is reduced, and the axial thrust of a rotor can be efficiently and compactly reduced, so that the rotor is kept balanced.
On one hand, the supercritical carbon dioxide compressor comprises a rotating shaft, a stator, a rotating wheel and a blocking assembly, wherein the stator is arranged around the rotating shaft, and the stator and the rotating shaft enclose to form an accommodating cavity; the rotating wheel is arranged in the accommodating cavity and connected with the rotating shaft, and the accommodating cavity is divided into a first flow channel and a second flow channel by the rotating wheel in the axial direction of the rotating shaft; the blocking assembly is arranged in the second flow channel and comprises a first blocking piece and a second blocking piece, the first blocking piece is connected with the rotating wheel, the second blocking piece is connected with the stator, and the airflow in the second flow channel flows out after passing through the first blocking piece and the second blocking piece so that the pressures in the first flow channel and the second flow channel are balanced.
According to an aspect of an embodiment of the present application, a first gap is formed between the first blocking member and the stator, and a second gap is formed between the second blocking member and the rotor in the axial direction.
According to an aspect of an embodiment of the present application, a value of the first gap ranges from 0.3 mm to 2mm; and/or the value range of the second gap is 0.3-2mm.
According to an aspect of an embodiment of the present application, the second flow passage includes an inner flow passage and an outer flow passage arranged one after another in a radial direction of the rotor, a dimension of the inner flow passage in the axial direction is larger than a dimension of the outer flow passage in the axial direction, and the blocking member is arranged in the inner flow passage.
According to one aspect of the embodiment of the application, the number of the first blocking parts and the second blocking parts is more than two, and the first blocking parts and the second blocking parts are alternately distributed at intervals along the radial direction of the rotating wheel.
According to one aspect of the embodiment of the application, the first blocking element and the second blocking element are both annular bodies and are arranged around the rotating shaft, one end of the first blocking element in the axial direction is connected with the rotating wheel, and one end of the second blocking element in the axial direction is connected with the stator.
According to an aspect of the embodiments of the present application, each of the first blocking member and the second blocking member is a tapered ring, and an opening of each of the first blocking member and the second blocking member toward one another end is smaller than an opening of each of the first blocking member and the second blocking member away from one another end in the axial direction.
According to an aspect of the embodiment of the present application, an angle between the first blocking member and the rotor is smaller than 90 degrees, and an angle between the second blocking member and the stator is smaller than 90 degrees.
According to an aspect of an embodiment of the present application, the first blocking member and the second blocking member are spaced apart by 5mm in a radial direction of the rotor.
In another aspect, a coaxial power generation system is provided according to an embodiment of the present application, including a generator, a turbine, and a supercritical carbon dioxide compressor as described above.
The supercritical carbon dioxide compressor and the coaxial power generation system provided by the embodiment of the application comprise a rotating shaft, a stator, a rotating wheel and a blocking component. The blocking assembly is arranged in the second flow passage between the rotating wheel and the stator, so that airflow in the second flow passage flows out after being throttled layer by layer through the blocking assembly, the airflow pressure in the second flow passage is reduced, the airflow pressures in the first flow passage and the second flow passage are balanced, axial force cannot be generated due to the fact that air pressure difference exists in the axial direction, the stability of the rotor in operation is improved, and safe and stable operation of the supercritical carbon dioxide compressor is facilitated.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic partial structure diagram of a supercritical carbon dioxide compressor according to an embodiment of the present application;
FIG. 2 is a schematic view of a partial structure of another supercritical carbon dioxide compressor according to an embodiment of the present application;
FIG. 3 is an enlarged partial schematic view at A in FIG. 2;
FIG. 4 is a schematic view of a partial structure of another supercritical carbon dioxide compressor according to an embodiment of the present application;
FIG. 5 is a schematic view of a partial structure of another supercritical carbon dioxide compressor according to an embodiment of the present application;
FIG. 6 is a schematic view of a partial structure of another supercritical carbon dioxide compressor according to an embodiment of the present application;
fig. 7 is a partial schematic view of another supercritical carbon dioxide compressor according to an embodiment of the present application;
FIG. 8 is an enlarged partial schematic view at B of FIG. 6;
fig. 9 is a partial schematic view of another supercritical carbon dioxide compressor including a regulating device according to an embodiment of the present application.
Reference numerals are as follows:
100-supercritical carbon dioxide compressor; x-axial direction; y-radial; q-included angle;
1-a rotating shaft; 2-a stator; 3-rotating wheel; 4-a first flow channel; 5-a second flow channel; 51-an internal flow passage; 52-outer flow passage;
6-a barrier component; 6 a-first barrier; 6 b-a second barrier; 61-a first gap; 62-a second gap;
200-a regulating device; 7-a movable ring; 8-a stationary ring; 9-spring.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following description is given with the directional terms as they are shown in the drawings and is not intended to limit the specific structure of the supercritical carbon dioxide compressor and the coaxial power generation system of the present application. In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.
For a better understanding of the present application, the supercritical carbon dioxide compressor and the coaxial power generation system of the embodiments of the present application are described in detail below with reference to fig. 1 to 9.
In recent years, a supercritical carbon dioxide power generation system is widely concerned due to the advantages of compact structure, simple circulation system, high power generation efficiency and the like, however, the excessive rotor axial thrust generated by the pressure difference between the front side and the rear side of a compressor impeller hub in the supercritical carbon dioxide power generation system is an important problem restricting the development of the power generation system.
Usually, a balance piston sealing structure is adopted to generate reverse thrust to balance the thrust generated by the impeller, however, the introduction of the balance piston sealing structure can obviously increase the length of a rotor shaft system, so that the size and the weight of equipment such as a gas compressor and the like are greatly increased, the balance piston sealing structure is not in accordance with the concept of supercritical carbon dioxide compact power generation equipment, and meanwhile, the overlong shaft system arrangement can greatly reduce the critical rotating speed of the rotor, so that the critical instability risk exists, and the common balance piston sealing structure is not beneficial to the research and development of the supercritical carbon dioxide power generation technology.
Based on the defects, the embodiment of the application provides the supercritical carbon dioxide compressor which can balance the axial pressure on the basis of not prolonging the length of a rotor shaft system.
Referring to fig. 1, an embodiment of the present application provides a supercritical carbon dioxide compressor 100, including a rotating shaft 1, a stator 2, a rotating wheel 3, and a blocking assembly 6, where the stator 2 is disposed around the rotating shaft 1, and the stator 2 and the rotating shaft 1 enclose to form an accommodating cavity; the rotating wheel 3 is arranged in the accommodating cavity and connected to the rotating shaft 1, and the accommodating cavity is divided into a first flow passage 4 and a second flow passage 5 by the rotating wheel 3 in the axial direction X of the rotating shaft 1; the blocking assembly 6 is disposed in the second flow channel 5, the blocking assembly 6 includes a first blocking member 6a and a second blocking member 6b, the first blocking member 6a is connected to the rotor 3, the second blocking member 6b is connected to the stator 2, and the airflow in the second flow channel 5 flows out after passing through the first blocking member 6a and the second blocking member 6b, so that the pressures in the first flow channel 4 and the second flow channel 5 are balanced.
In this embodiment, the supercritical carbon dioxide compressor 100 may be a compressor in a supercritical carbon dioxide power generation system, wherein a runner 3 is disposed on a rotating shaft 1 and forms a first flow passage 4 and a second flow passage 5 opposite to each other in an axial direction X with respect to a stator 2, when a carbon dioxide gas flow flows through the first flow passage 4, the carbon dioxide gas flow is compressed and pressurized by the runner 3 and then flows out from an outlet, at this time, a part of the gas flow flows downward in a radial direction Y and enters the second flow passage 5, and the gas flow in the second flow passage 5 is a pressurized gas flow, and the pressure of the gas flow is greater than the pressure of the gas flow in the first flow passage 4, so that an axial X force is formed by a pressure difference in the axial direction X, and the runner 3 is easily unstable in the axial direction X.
Based on the above problem, a blocking assembly 6 is disposed in the second flow channel 5, the blocking assembly 6 includes a first blocking member 6a and a second blocking member 6b, and optionally, the first blocking member 6a is disposed on an end surface of the rotor 3, and the second blocking member 6b is disposed on an inner wall surface of the stator 2 opposite to the end surface, with the second flow channel 5 therebetween.
When the airflow flows in the second flow passage 5, the airflow pressure is weakened layer by layer after passing through the arranged blocking assembly 6, and finally the purpose of pressure reduction is achieved and the airflow pressure in the first flow passage 4 is balanced.
Alternatively, the first stoppers 6a may be provided on the entire end surface of the rotor 3 or a partial end surface, and similarly, the second stoppers 6b may be provided on the entire inner wall surface of the stator 2 or a partial inner wall surface.
The specific structure of the blocking assembly 6 is not particularly limited in the present application, and the blocking assembly can be disposed in the second flow channel 5 to form a certain blocking effect on the air flow and reduce the pressure of the air flow.
Since the first blocking member 6a is disposed on the rotor 3 and rotates with the rotor 3, and the second blocking member 6b is disposed on the stator 2 and remains stationary with the stator 2, the first blocking member 6a may alternatively have a rotating tooth structure, and the second blocking member 6b may alternatively have a stationary tooth structure.
Alternatively, the number of the first blocking members 6a and the second blocking members 6b may be determined according to the magnitude of the pressure of the air flow in the second flow passage 5 and the required air pressure, the more the number is, the stronger the pressure reduction capability of the air flow is, and the weaker the pressure reduction capability is, and generally, the number of the first blocking members 6a and the number of the second blocking members 6b are respectively 3 to 10.
According to the supercritical carbon dioxide compressor 100 provided by the embodiment of the application, the blocking component 6 is arranged in the second flow passage 5 between the runner 3 and the stator 2, so that airflow in the second flow passage 5 flows out after throttling layer by layer through the blocking component 6, the airflow pressure in the second flow passage 5 is reduced, the airflow pressures in the first flow passage 4 and the second flow passage 5 are balanced, the generation of axial X force caused by the existence of air pressure difference in the axial X direction is avoided, the stability of the runner 3 during operation is improved, and the safe and stable operation of the supercritical carbon dioxide compressor 100 is facilitated. In addition, the axial X span of the blocking assembly 6 arranged in the second flow passage 5 is short, and the defect that the axial X span of a traditional balance piston sealing structure is large is overcome, so that the arrangement length of the whole shafting is reduced, the problem that the resonance instability of the rotating shaft 1 is caused by the first-order critical rotating speed of the rotating shaft 1 is solved, the axial X thrust of the impeller can be reduced efficiently and compactly, the design and the subsequent long-term safe and stable operation of the supercritical carbon dioxide compressor 100 can be effectively guaranteed, and the design and the subsequent long-term safe and stable operation of the supercritical carbon dioxide compressor are very important in engineering significance.
As an alternative embodiment, referring to fig. 2 and fig. 3, in the axial direction X, a first gap 61 is formed between the first blocking member 6a and the stator 2, and a second gap 62 is formed between the second blocking member 6b and the rotor 3.
In this embodiment, it is considered that the first blocking member 6a is driven to rotate when the rotor 3 rotates, so that a certain distance is kept between the first blocking member 6a and the stator 2 to form the first gap 61, and a certain distance is kept between the second blocking member 6b and the rotor 3 to form the second gap 62, thereby avoiding mutual contact.
As an alternative embodiment, the value of the first gap 61 is usually in the range of 0.3-2mm; and/or the second gap 62 has a value ranging from 0.3 mm to 2mm.
Alternatively, the first gap 61 and the second gap 62 may have the same pitch or different pitches, and as shown in fig. 4, the first gap 61 and the second gap 62 may have different pitches on the premise that the safety distance is satisfied.
The larger the distance between the first gap 61 and the second gap 62 is, the smaller the extension length of the corresponding first blocking member 6a and the second blocking member 6b in the axial direction X is, the weaker the blocking capability of the air flow is, and thus the weaker the overall pressure reduction capability is, and vice versa, the stronger the pressure reduction capability and the safety distance are selected in consideration of the need.
According to the supercritical carbon dioxide compressor 100 provided by the embodiment of the application, the extension lengths of the first blocking piece 6a and the second blocking piece 6b in the axial direction X are balanced, the sizes of the intervals corresponding to the first gap 61 and the second gap 62 are adjusted, on the basis of meeting the pressure reduction capacity, the blocking component 6 is prevented from contacting with respective opposite surfaces, the safety performance in operation is improved, the risk of contact damage is reduced, meanwhile, the pressure reduction capacity of the supercritical carbon dioxide compressor 100 on airflow can be adjusted according to the sizes of the intervals of the first gap 61 and the second gap 62, and the adaptability of the device is improved.
As an alternative embodiment, referring to fig. 5, in the radial direction Y of the runner 3, the second flow passage 5 includes an inner flow passage 51 and an outer flow passage 52 which are arranged in succession, the size of the inner flow passage 51 in the axial direction X is larger than that of the outer flow passage 52 in the axial direction X, and the blocking assembly 6 is arranged in the inner flow passage 51.
In the present embodiment, the second flow passage 5 is divided into an inner flow passage 51 and an outer flow passage 52 which are arranged in succession, wherein the inner flow passage 51 is located closer to the middle rotating shaft 1 and the outer flow passage 52 is located closer to the inlet of the outer portion.
Optionally, the size of the inner flow passage 51 in the axial direction X is greater than the size of the outer flow passage 52 in the axial direction X, and it can be understood that, equivalently, a groove is formed in the inner wall of the stator 2, so that the width of the inner flow passage 51 in the axial direction X is widened, and the outer flow passage 52 has a higher accommodation capacity, and is not processed, and is narrower than the inner flow passage 51.
Alternatively, a plurality of grooves may be formed at the inner wall of the stator 2, and as shown in fig. 6, the plurality of grooves may have different receiving capacities, and the height of each groove in the radial direction Y is not particularly limited in the present application.
Considering that the rotor 3 is annular in cross section, the groove at the inner wall of the stator 2 corresponding thereto is also generally an annular groove, optionally the depth of each groove in the axial direction X may be determined according to the extension of the blocking assembly 6 to be accommodated, ensuring that the blocking assembly 6 can be accommodated in the groove.
When a groove is made in the inner wall of the stator 2 near the shaft 1, the height of the groove in the radial direction Y is optionally made larger than half the height of the rotor 3 in order to accommodate more blocking members 6.
The supercritical carbon dioxide compressor 100 provided by the embodiment of the application enables the size of the internal flow passage 51 on the axial X to be larger than that of the external flow passage 52 on the axial X by widening the internal flow passage 51, provides sufficient accommodation space for the arrangement of the blocking assembly 6, ensures that the blocking assembly 6 can extend for a certain length on the axial X, enables the whole to have a better effect of blocking airflow, and further is more beneficial to the pressure reduction of the airflow.
As an alternative embodiment, please continue to refer to fig. 6, the number of the first blocking elements 6a and the second blocking elements 6b is two or more, and the first blocking elements 6a and the second blocking elements 6b are alternately and alternately distributed along the radial direction Y of the rotating wheel 3.
In this embodiment, a plurality of first blocking members 6a and second blocking members 6b are disposed in the second flow channel 5, and are alternately distributed at intervals, and the specific number of the first blocking members 6a and the second blocking members 6b is not particularly limited in the present application, and the size and arrangement requirements can be satisfied.
As for the specific alternate form of the first blocking members 6a and the second blocking members 6b, alternatively, there may be a single first blocking member 6a corresponding to a single second blocking member 6b, there may also be a single first blocking member 6a corresponding to two second blocking members 6b, or there may be two first blocking members 6a corresponding to a single second blocking member 6b, etc., and the specific alternate form is not limited.
The first blocking member 6a and the second blocking member 6b are spaced in the radial direction Y to avoid contact with each other in the radial direction Y, and optionally, the specific spacing distance may be determined according to actual size and depressurization requirements, and the distance between the two is not limited.
Alternatively, the first blocking members 6a and the second blocking members 6b may have the same pitch in the radial direction Y, and may be arranged uniformly, or may be different from each other, and may be arranged irregularly and non-uniformly.
The supercritical carbon dioxide compressor 100 provided by the embodiment of the application, the number of the first blocking part 6a and the second blocking part 6b which are arranged is more than two, the blocking capability of the airflow in the second flow channel 5 is improved, and further, the pressure reduction capability of the airflow is improved, and meanwhile, the first blocking part 6a and the second blocking part 6b are alternately distributed at intervals, so that the airflow can be throttled layer by layer, the uniformity of pressure reduction is improved, the interval distribution also avoids the structural interference of the first blocking part 6a and the second blocking part 6b when the rotating wheel 3 rotates, the safety in operation is ensured, and on the basis of uniform throttling, the safety guarantee is provided.
As an alternative embodiment, the first blocking element 6a and the second blocking element 6b are both annular bodies and are arranged around the rotating shaft 1, one end of the first blocking element 6a in the axial direction X is connected with the rotating wheel 3, and one end of the second blocking element 6b in the axial direction X is connected with the stator 2.
Since the runner 3 is disposed around the rotating shaft 1, the back section of the runner 3 is a ring surface, the first blocking member 6a correspondingly disposed on the back section of the runner 3 is a ring-shaped member and disposed around the rotating shaft 1, and the second blocking member 6b is also a ring-shaped member and disposed around the rotating shaft 1.
Optionally, the annular bodies of the first blocking element 6a and the second blocking element 6b are cylindrical annular bodies, the annular bodies are arc-shaped plate structures, and the annular bodies are alternately arranged at intervals.
When the first blocking member 6a and the second blocking member 6b of the plurality of cylindrical ring bodies are provided, the plurality of ring bodies are all provided around the rotating shaft 1 to form concentric rings centering on the rotating shaft 1.
The supercritical carbon dioxide compressor 100 provided by the embodiment of the application is characterized in that the first blocking piece 6a and the second blocking piece 6b are arranged into an annular structure, so that the blocking assembly 6 is arranged in the second flow channel 5 around the rotating shaft 1 in a circle, the circumferential air flow of the rotating shaft 1 is comprehensively blocked by pressure reduction, the efficiency of reducing the air pressure is further improved, the pressure reduction effect is improved, and the pressure reduction treatment of the air flow is more sufficient.
As an alternative embodiment, please refer to fig. 7, the first blocking element 6a and the second blocking element 6b are both conical rings, and the opening of the first blocking element 6a and the second blocking element 6b towards each other end is smaller than the opening of the first blocking element and the second blocking element away from each other end in the axial direction X.
Alternatively, the first blocking member 6a and the second blocking member 6b may have different structures, for example, a tapered ring structure, and may also form a blocking member for the gas flow in the second flow passage 5 in the downward direction in the radial direction Y.
In the formed conical ring structure, the opening of each of the first blocking member 6a and the second blocking member 6b towards one end of each other is smaller than the opening at the end away from each other in the axial direction X, and alternatively, other forms of ring structures may be adopted.
The supercritical carbon dioxide compressor 100 provided by the embodiment of the application provides another practical specific structure of the first blocking piece 6a and the second blocking piece 6b, so that the diversity of the arrangement of the blocking assembly 6 is improved, and the requirement on the pressure reduction of the air flow can be met.
As an alternative embodiment, referring to fig. 6 in combination with fig. 8, an included angle Q between the first blocking member 6a and the rotor 3 is smaller than 90 degrees, and an included angle Q between the second blocking member 6b and the stator 2 is smaller than 90 degrees.
In this embodiment, the included angles Q between the respective connecting surfaces of the first blocking member 6a and the second blocking member 6b are smaller than 90 degrees, and specifically, the extending directions of the first blocking member 6a and the second blocking member 6b are defined.
Experiments show that the included angle Q between the blocking component 6 and the connecting surface is smaller than 90 degrees, namely, the acute angle is formed to form a better blocking effect on the air flow, and compared with a right angle or an obtuse angle, the formed acute angle can improve the pressure reduction effect to a certain extent.
Alternatively, when the blocking assembly 6 is a cylindrical annular body, in particular, the included angle Q between the arc-shaped surface and the connecting section is smaller than 90 degrees.
According to the supercritical carbon dioxide compressor 100 provided by the embodiment of the application, the included angle Q between the surfaces of the first blocking piece 6a and the second blocking piece 6b which are respectively connected with the first blocking piece and the second blocking piece is smaller than 90 degrees, a specific connecting structure is provided, the blocking of airflow in the second flow channel 5 is facilitated, the pressure reduction of the airflow is better achieved, and the pressure reduction efficiency is improved.
As an alternative embodiment, with continued reference to fig. 8, the first blocking element 6a and the second blocking element 6b are spaced apart by 5mm in the radial direction Y of the rotor 3.
Alternatively, when the first and second stoppers 6a and 6b are cylindrical ring bodies, the pitch in the radial direction Y between the ring bodies is 5mm.
According to the supercritical carbon dioxide compressor 100 provided by the embodiment of the application, the distance between the first blocking piece 6a and the second blocking piece 6b along the radial direction Y of the rotating wheel 3 is set to be 5mm, so that the safety distance between the first blocking piece and the second blocking piece is ensured on the basis of meeting the requirement of throttling airflow layer by layer, and a better pressure reduction effect is achieved under the comprehensive consideration.
As an alternative embodiment, please refer to fig. 9, the airflow is decompressed and flows out from the second flow channel 5, and an adjusting device 200 may be disposed in the flowing out channel, that is, a moving ring 7 is connected along the axial direction X of the rotating shaft 1, and the moving ring 7 is fixed on the rotating shaft 1 and rotates at the same speed as the rotating shaft 1; a groove is arranged at the stator 2, and the static ring 8 is arranged in the groove and is connected with the groove of the stator 2 through a spring 9.
When the rotating shaft 1 rotates at 0 rpm, the static ring 8 is tightly attached to the dynamic ring 7 through the pre-applied force of the spring 9. When the rotating shaft 1 starts to rotate, the pressure generated by the hydrodynamic effect between the moving ring 7 and the static ring 8 counteracts the prestress applied by the spring 9 so as to separate the moving ring 7 from the static ring 8. The adjusting device 200 adjusts the size of the leakage gap between the moving ring 7 and the stationary ring 8 through the hydrodynamic effect, so that the pressure drop at the outlet of the second flow passage 5 is controlled to be 30% -50% of the pressure drop of the second flow passage 5, and the unbalance of the compressor 100 caused by reverse thrust generated by too low pressure of the inner flow passage 51 and the outer flow passage 52 in the second flow passage 5 is avoided.
On the other hand, according to the embodiment of the present application, a coaxial power generation system is provided, which includes a generator, a turbine, and the supercritical carbon dioxide compressor 100 as described above.
In summary, according to the supercritical carbon dioxide compressor 100 and the coaxial power generation system provided in the embodiment of the present application, the supercritical carbon dioxide compressor 100 includes a rotating shaft 1, a stator 2, a rotating wheel 3, and a blocking assembly 6. The blocking assembly 6 is arranged in the second flow passage 5 between the runner 3 and the stator 2, so that air flow in the second flow passage 5 flows out after being throttled layer by layer through the blocking assembly 6, the air flow pressure in the second flow passage 5 is reduced, the air flow pressures in the first flow passage 4 and the second flow passage 5 are balanced, axial X force cannot be generated due to air pressure difference in the axial X direction, the stability of the runner 3 during operation is improved, and the safe and stable operation of the supercritical carbon dioxide compressor 100 is facilitated. In addition, the axial X span of the blocking assembly 6 arranged in the second flow passage 5 is short, and the defect that the axial X span of a traditional balance piston sealing structure is large is overcome, so that the arrangement length of the whole shafting is reduced, the problem that the resonance instability of the rotating shaft 1 is caused by the first-order critical rotating speed of the rotating shaft 1 is solved, the axial X thrust of the impeller can be reduced efficiently and compactly, the design and the subsequent long-term safe and stable operation of the supercritical carbon dioxide compressor 100 can be effectively guaranteed, and the design and the subsequent long-term safe and stable operation of the supercritical carbon dioxide compressor are very important in engineering significance.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (10)
1. A supercritical carbon dioxide compressor, comprising:
a rotating shaft;
the stator is arranged around the rotating shaft, and the stator and the rotating shaft are enclosed to form an accommodating cavity;
the rotating wheel is arranged in the accommodating cavity and connected with the rotating shaft, and the rotating wheel divides the accommodating cavity into a first flow channel and a second flow channel in the axial direction of the rotating shaft;
the blocking assembly is arranged in the second flow channel and comprises a first blocking piece and a second blocking piece, the first blocking piece is connected with the rotating wheel, the second blocking piece is connected with the stator, and airflow in the second flow channel flows out after passing through the first blocking piece and the second blocking piece so that pressures in the first flow channel and the second flow channel are balanced.
2. The supercritical carbon dioxide compressor of claim 1 wherein a first gap is formed between the first barrier and the stator and a second gap is formed between the second barrier and the rotor in the axial direction.
3. The supercritical carbon dioxide compressor of claim 2 wherein the first clearance has a value in the range of 0.3-2mm;
and/or the value range of the second gap is 0.3-2mm.
4. The supercritical carbon dioxide compressor of claim 1 wherein the second flow passage comprises an inner flow passage and an outer flow passage arranged in succession in a radial direction of the runner, the inner flow passage having a dimension in the axial direction greater than a dimension in the axial direction of the outer flow passage, the blocking assembly being disposed in the inner flow passage.
5. The supercritical carbon dioxide compressor of claim 1 wherein the number of the first and second blocking elements is two or more, and the first and second blocking elements are alternately and alternately distributed along the radial direction of the runner.
6. The supercritical carbon dioxide compressor of claim 1 wherein the first barrier and the second barrier are each an annular body and are disposed around the rotating shaft, the first barrier is connected to the rotating wheel at one end in the axial direction, and the second barrier is connected to the stator at one end in the axial direction.
7. The supercritical carbon dioxide compressor of claim 6 wherein the first and second barriers are each conical rings, the first and second barriers each having a smaller opening in the axial direction toward one end of each than the opening at the end away from each other.
8. The supercritical carbon dioxide compressor as defined in claim 6 wherein the angle between the first blocking member and the rotor is less than 90 degrees and the angle between the second blocking member and the stator is less than 90 degrees.
9. The supercritical carbon dioxide compressor of claim 6, wherein the first and second barriers are spaced apart by 5mm in the radial direction of the runner.
10. An on-axis power generation system comprising a generator, a turbine and a supercritical carbon dioxide compressor as claimed in any one of claims 1 to 9.
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Cited By (1)
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|---|---|---|---|---|
| CN115450950A (en) * | 2022-11-08 | 2022-12-09 | 中国核动力研究设计院 | Gas compressor and supercritical carbon dioxide power generation system |
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