CN115596684A - Compressor, supercritical carbon dioxide circulation system and compressor pressure control method - Google Patents
Compressor, supercritical carbon dioxide circulation system and compressor pressure control method Download PDFInfo
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- CN115596684A CN115596684A CN202211526024.1A CN202211526024A CN115596684A CN 115596684 A CN115596684 A CN 115596684A CN 202211526024 A CN202211526024 A CN 202211526024A CN 115596684 A CN115596684 A CN 115596684A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 18
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 46
- 230000001105 regulatory effect Effects 0.000 claims abstract description 29
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 abstract description 28
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 101000874364 Homo sapiens Protein SCO2 homolog, mitochondrial Proteins 0.000 description 1
- 102100035546 Protein SCO2 homolog, mitochondrial Human genes 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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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
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/662—Balancing of rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0668—Sliding valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application provides a compressor, a supercritical carbon dioxide circulation system and a compressor pressure control method. The compressor includes: the impeller comprises a casing, a rotating shaft, an impeller, a first sealing element and a fluid regulating device. The shell is provided with a containing chamber and a balance chamber, the containing chamber is provided with an air inlet and an air outlet, and the balance chamber is arranged on one side of the air outlet far away from the air inlet and provided with an opening communicated with the outside; the rotating shaft is arranged on the shell, an airflow channel is formed between the rotating shaft and the shell, and the airflow channel is communicated with the accommodating cavity and the balance cavity; the impeller is sleeved on the air compression rotating shaft and arranged in the accommodating cavity; the first sealing element is arranged in the airflow channel; the fluid adjusting device is arranged at the opening and movably connected with the machine shell so as to adjust the size of the opening. The gas compressor provided by the application can adjust the flow of gas entering the balance cavity through the fluid adjusting device, change the pressure of the balance cavity and further adjust the pressure of the back of the impeller of the gas compressor.
Description
Technical Field
The application relates to the technical field of power equipment, in particular to a compressor, a supercritical carbon dioxide circulation system and a compressor pressure control method.
Background
Supercritical carbon dioxide (SCO 2 supercritical carbon dioxide) Brayton cycle is used as a revolutionary energy power technology, and the supercritical carbon dioxide is used as a working medium of a power cycle system, so that the advantages of high efficiency, low cost, high cleanliness, compact structure and the like are increasingly paid attention and accepted by domestic and foreign research institutions. Especially, carbon dioxide has the advantages of moderate critical pressure, good stability and nuclear physical property, no toxicity, abundant reserves and the like, and SCO2 circulation is considered as one of power cycles with the most application prospect of nuclear reactors (fourth generation nuclear power) and has potential application in novel combustion engines, thermal power plants and solar generating sets.
Because the density of the supercritical carbon dioxide working medium is close to that of liquid, the pressure difference between the front and the back of the impeller is large, the axial thrust has obvious influence on the reliable operation of the gas compressor, and the pressure at the back of the impeller has important influence on the control of the axial thrust of the gas compressor. In addition, part of gas is extracted from the outlet of the gas compressor to be used as sealing gas for shaft end dry gas sealing and used as lubricating working medium between a dry gas sealing movable ring and a static ring, if the pressure at the back of the impeller is too high, the pressure difference between the outlet of the gas compressor and the back of the impeller is too small, and the problem that enough sealing gas is difficult to provide to effectively lubricate the dry gas sealing is directly influenced, so that the reliability of the dry gas sealing is directly influenced, the reliability of the gas compressor is further influenced, and even the safety of the whole circulating system is influenced, and the problem is particularly prominent particularly when the gas compressor is started, stopped and runs at low speed.
In order to improve the running safety performance of the compressor, the application provides the compressor, a supercritical carbon dioxide circulating system and a compressor pressure control method.
Disclosure of Invention
The embodiment of the application provides a gas compressor, a supercritical carbon dioxide circulation system and a gas compressor pressure control method.
An embodiment of a first aspect of the present application provides a compressor, including: the impeller comprises a casing, a rotating shaft, an impeller, a first sealing element and a fluid regulating device.
The shell is provided with a containing chamber and a balance chamber, the containing chamber is provided with an air inlet and an air outlet, the balance chamber is arranged on one side of the air outlet far away from the air inlet, and the balance chamber is provided with an opening communicated with the outside;
the rotating shaft is arranged on the shell, an airflow channel is formed between the rotating shaft and the shell, and the airflow channel is communicated with the accommodating cavity and the balance cavity;
the impeller is sleeved on the rotating shaft and arranged in the accommodating cavity;
the first sealing element is arranged in the airflow channel;
the fluid adjusting device is arranged at the opening and is movably connected with the machine shell so as to adjust the size of the opening.
According to any one of the embodiments of the first aspect of the present application, the housing includes a first side wall and a second side wall that are opposite to each other along an axial direction of the rotation shaft, the accommodating chamber and the balancing chamber are disposed on opposite sides of the first side wall, the balancing chamber is formed between the first side wall and the second side wall, and an airflow channel is formed between the first side wall and the rotation shaft.
In accordance with any of the preceding embodiments of the first aspect of the present application, the enclosure further comprises an air guide channel disposed in the first sidewall, the air guide channel communicating the air outlet and the first sealing member.
According to any one of the embodiments of the first aspect of the present application, a gap is formed between the second side wall and the rotating shaft, the gap is communicated with the balance chamber, and the compressor further comprises a second sealing element, and the second sealing element is arranged in the gap to seal the balance chamber.
According to any one of the preceding embodiments of the first aspect of the present application, the fluid regulating device comprises an elastic member, two magnetic members and a piston, wherein the two magnetic members are axially connected with two ends of the elastic member, and the piston is axially connected with one magnetic member.
According to any one of the preceding embodiments of the first aspect of the present application, the balancing chamber comprises an air duct, and both ends of the air duct are respectively connected to the opening and the air outlet.
According to any of the preceding embodiments of the first aspect of the present application, the compressor further comprises a pressure acquisition device.
In a second aspect of the present application, a supercritical carbon dioxide circulation system is further provided, where the system includes the compressor provided in the first aspect of the present application.
According to any of the preceding embodiments of the second aspect of the application, the system further comprises: the compressor, the high-speed starting motor and the driving turbine are connected through the same rotating shaft.
An embodiment of the third aspect of the present application further provides a method for controlling pressure of a compressor, which is applied to the compressor provided in the embodiment of the first aspect of the present application, and the method includes: acquiring a pressure value of the back of the impeller;
comparing the pressure value of the back of the impeller with a preset parameter range value, wherein the preset parameter range value comprises a first threshold value and a second threshold value, and the first threshold value is smaller than the second threshold value;
under the condition that the pressure value of the back of the impeller is smaller than a first threshold value, controlling the fluid regulating device to move relative to the opening so as to increase the size of the opening;
and controlling the fluid regulating device to move relative to the opening to reduce the size of the opening under the condition that the pressure value of the back of the impeller is larger than a second threshold value.
According to any one of the previous embodiments of the third aspect of the present application, the preset parameter range value includes a first threshold value and a second threshold value, and the first threshold value is smaller than the second threshold value; under the condition that the pressure value of the back of the impeller is smaller than a first threshold value, controlling the fluid regulating device to move relative to the opening so as to reduce the size of the opening; and controlling the fluid regulating device to move relative to the opening to increase the size of the opening under the condition that the pressure value of the back of the impeller is larger than a second threshold value.
Compared with the prior art, the compressor comprises: the impeller comprises a casing, a rotating shaft, an impeller, a first sealing element and a fluid regulating device. The shell is provided with a containing chamber and a balance chamber, the containing chamber is provided with an air inlet and an air outlet, and the balance chamber is arranged on one side of the air outlet far away from the air inlet and provided with an opening communicated with the outside; the rotating shaft is arranged on the shell, an airflow channel is formed between the rotating shaft and the shell, and the airflow channel is communicated with the accommodating chamber and the balance chamber; the impeller is sleeved on the air compression rotating shaft and arranged in the accommodating cavity; the first sealing element is arranged in the airflow channel; the fluid adjusting device is arranged at the opening and movably connected with the machine shell so as to adjust the size of the opening. The air compressor provided by the application can adjust the flow of the gas entering the balance cavity through the fluid adjusting device, and change the pressure of the balance cavity, so as to adjust the pressure on the back of the impeller of the air compressor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a compressor provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a fluid regulating device according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a compressor pressure control method according to an embodiment of the present disclosure.
Description of reference numerals:
100. a gas compressor;
1. a housing; 11. a housing chamber; 111. an air inlet; 112. an air outlet; 12. a balancing chamber; 121. an opening; 122. an air duct; 13. a first side wall; 14. a second side wall;
2. a rotating shaft; 3. an impeller; 4. a first seal member;
5. a fluid regulating device; 51. an elastic member; 52. a magnetic member; 53. a piston;
6. a second seal member;
7. a pressure acquisition device; x, axial direction.
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 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.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in this application can be understood as appropriate by one of ordinary skill in the art.
For a better understanding of the present invention, embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Because the density of the supercritical carbon dioxide working medium is close to that of liquid, the front-back pressure difference of an impeller of the gas compressor is large, so that an axial acting force is generated, the rotating shaft 2 generates axial movement, and a static impeller and a movable impeller of the gas compressor 100 are rubbed with each other, so that a fault is caused, and the axial thrust is one of key factors influencing the safe and reliable operation of the supercritical carbon dioxide gas compressor.
Therefore, referring to fig. 1, in a first aspect of the present application, a compressor 100 is provided to improve the safety performance of the compressor 100. The compressor 100 includes: the device comprises a shell 1, a rotating shaft 2, an impeller 3, a first sealing element 4 and a fluid adjusting device 5. The cabinet 1 has a housing chamber 11 and a balance chamber 12, the housing chamber 11 has an air inlet 111 and an air outlet 112, the balance chamber 12 is disposed on one side of the air outlet 112 far away from the air inlet 111, the balance chamber 12 has an opening 121 communicated with the outside; the rotating shaft 2 is arranged on the machine shell 1, an airflow channel is formed between the rotating shaft 2 and the machine shell 1, and the airflow channel is communicated with the accommodating chamber 11 and the balancing chamber 12; the impeller 3 is sleeved on the rotating shaft 2 and is arranged in the accommodating chamber 11; the first sealing element 4 is arranged in the airflow channel; the fluid regulating device 5 is disposed at the opening 121, and the fluid regulating device 5 is movably connected with the casing 1 to regulate the size of the opening 121.
The compressor 100 provided by the application can adjust the flow rate of the gas entering the balance chamber 12 through the fluid adjusting device 5, and change the pressure of the balance chamber 12, so as to adjust the pressure of the compressor impeller 3. Because the balance chamber 12 is disposed on the side of the air outlet 112 away from the air inlet 111, the balance chamber 12 has an opening 121 communicating with the outside, and the fluid adjusting device 5 is used to adjust the size of the opening 121, the fluid adjusting device 5 is close to the leeward side of the impeller 3, and the fluid adjusting device 5 can be used to adjust the back pressure of the impeller 3, thereby achieving the effect of adjusting the axial force of the compressor 100. The compressor 100 provided by the application improves the convenience of pressure adjustment and prolongs the service life of the compressor 100.
It will be appreciated that the equalizing chamber 12 is not completely sealed and that the equalizing chamber 12 includes an outlet that is open to the outside atmosphere, so there will be some venting within a tolerable amount.
Optionally, the compressor 100 further comprises a dry gas seal, which is disposed on a side of the fluid regulating device 5 away from the gas outlet 112. The dry gas seal is a novel non-contact type gas film seal based on the modern fluid dynamic pressure lubrication theory. The sealing device has the characteristics of less leakage, small abrasion, long service life, low energy consumption, no oil pollution of sealed fluid and the like. The dry gas seal comprises a dynamic ring, a static ring and a connecting component, wherein a micron-sized flow groove is usually formed on the end face of the dynamic ring or the static ring. Alternatively, the flow channel may be a "U" shaped channel, a "V" shaped channel, or other shaped channel. The dry gas sealing element relies on the fluid dynamic pressure effect generated by the relative operation of the movable ring, and a layer of gas film is formed between the two end faces of the movable ring and the static ring to balance the closing force, so that the non-contact operation of the sealing end face is realized. The fluid regulating device 5 can be used for adaptively regulating the pressure between the back of the impeller 3 and the dry gas seal.
When the pressure value of the back of the impeller 3 is small, the fluid regulating device 5 moves relative to the casing 1 to increase the opening 121, so as to increase the pressure of the balance chamber 12 and the back of the impeller 3, high-pressure gas is flushed into the balance chamber 12, the high-pressure gas is discharged through an outlet in the balance chamber 12, but the discharge amount is far smaller than the air intake amount, so that the pressure received by the balance chamber 12 is increased, and further, the axial force received by the rotating shaft 2 is increased. Similarly, when the pressure value at the back of the impeller 3 is larger, the fluid regulating device 5 moves relative to the casing 1 to reduce the opening 121, so as to reduce the pressure at the back of the balance chamber 12 and the impeller 3, and further reduce the axial force applied to the rotating shaft 2. In an embodiment, the first sealing member 4 includes any one of a comb-tooth structure, a honeycomb structure, a brush structure, and a graphite structure, or other structures, which are not limited in this application.
In one embodiment, the compressor 100 further includes a thrust bearing (not shown) that balances and cancels a portion of the axial force applied to the shaft 2.
In an embodiment, the compressor 100 further includes a detection device and a control device (not shown), and the detection device can detect whether the axial force of the rotating shaft 2 is balanced in real time. When the balance is not balanced, the control device can timely control the movement of the fluid adjusting device 5, so as to adjust the pressure in the balance chamber 12, and the axial stress of the rotating shaft 2 is kept in dynamic balance.
Optionally, the detection device may be a bidirectional force transducer, the bidirectional force transducer may measure the axial force applied to the compressor 100 during the working condition change in real time, and feed the pressure value back to the control device in time, and the control device adjusts the pressure in the balance chamber 12 to balance the axial force.
Optionally, the control device may be a computer, a single chip microcomputer, a Field Programmable Gate Array (FPGA Field Programmable Gate Array), or the like.
In some alternative embodiments, the casing 1 includes a first side wall 13 and a second side wall 14 oppositely disposed along the axial direction X of the rotating shaft 2, the accommodating chamber 11 and the balancing chamber 12 are disposed on two opposite sides of the first side wall 13, the balancing chamber 12 is formed between the first side wall 13 and the second side wall 14, and an airflow passage is formed between the first side wall 13 and the rotating shaft 2.
In these alternative embodiments, the first side wall 13 may separate the accommodating chamber 11 and the equilibrium chamber 12, and the housing 1, the rotating shaft 2, the first side wall 13 and the second side wall 14 may enclose the equilibrium chamber 12.
In some alternative embodiments, the cabinet 1 further includes an air guide passage (not shown) provided in the first sidewall 13, the air guide passage communicating the air outlet 112 and the first sealing member 4.
In some alternative embodiments, the second sidewall 14 and the rotating shaft 2 have a gap therebetween communicating with the balance chamber 12, and the compressor 100 further includes a second seal 6, the second seal 6 being disposed in the gap to seal the balance chamber 12.
In these alternative embodiments, the second seal 6 is provided in the gap between the second side wall 14 and the shaft 2, and the second seal 6 may improve the sealing effect of the balance chamber 12.
In an embodiment, the second sealing member 6 includes any one of a comb-tooth structure, a honeycomb structure, a brush structure, and a graphite structure, or other structures, which are not limited in this application.
Referring to fig. 2, in some alternative embodiments, the fluid adjusting device 5 includes an elastic member 51, two magnetic members 52 and a piston 53, the two magnetic members 52 are connected to two ends of the elastic member 51 along the axial direction X, and the piston 53 is connected to one magnetic member 52 along the axial direction X.
In these alternative embodiments, the fluid regulating device 5 may include a piston 53, a magnetic member 52, an elastic member 51 and a magnetic member 52 sequentially connected in the axial direction X.
When the pressure at the back of the impeller 3 needs to be reduced, the magnetic force between the two magnetic members 52 of the fluid regulating device 5 can be reduced, the elastic force of the elastic member 51 is unchanged, and therefore, the resultant force of the magnetic force and the elastic force is reduced, at this time, the pressure of the balance chamber 12 is greater than the resultant force of the magnetic force and the elastic force, the pressure of the balance chamber 12 pushes the piston 53 to move to increase the size of the opening 121, so as to increase the gas flow entering the balance chamber 12, and reduce the pressure of the balance chamber 12, and accordingly, the pressure at the back of the impeller 3 is also reduced.
When the back pressure of the impeller 3 needs to be increased, the magnetic force between the two magnetic members 52 of the fluid regulating device 5 can be increased, the elastic force of the elastic member 51 is unchanged, and therefore, the resultant force of the magnetic force and the elastic force is increased, at this time, the pressure of the balance chamber 12 is smaller than the resultant force of the magnetic force and the elastic force, and the pressure of the balance chamber 12 pushes the piston 53 to move so as to reduce the size of the opening 121, thereby reducing the gas flow entering the balance chamber 12, increasing the pressure of the balance chamber 12, and accordingly increasing the back pressure of the impeller 3.
It can be understood that, as the fluid regulating device 5 moves, the elastic force of the elastic member 51 increases, and at this time, the magnitude of the magnetic force of the two magnetic members 52 is controlled so that the resultant force of the magnetic force and the elastic force is equal to the pressure of the balance chamber 12, thereby balancing the pressure of the press 100.
It can be understood that the fluid regulating device 5 provided by the present application can control the pressure at the back of the impeller 3 only by adjusting the magnetic force of the two magnetic members 52, which is not only simple in structure, but also convenient to control.
In an embodiment, the fluid regulating device 5 may also be a valve.
In some alternative embodiments, the equalizing chamber 12 includes an air duct 122, and the air duct 122 is connected to the opening 121 and the air outlet 112 at two ends thereof.
In these alternative embodiments, the gas duct 122 communicates between the gas outlet 112 and the opening 121, and the balance chamber 12 can take gas from the gas outlet 112 of the compressor 100 and change the pressure of the balance chamber 12 by the flow of gas into the balance chamber 12.
In some optional embodiments, the compressor 100 further includes a pressure acquisition device 7, the pressure acquisition device 7 may acquire an axial thrust of the compressor 100 and a sealing signal of the first sealing element 4 and/or the second sealing element 6, and the pressure acquisition device 7 may transmit the signal to a signal processing device, and the signal processing device may adjust the pressure of the compressor 100 according to the signal.
In a second aspect, embodiments of the present application provide a supercritical carbon dioxide cycle system, which includes: the compressor provided by any embodiment of the first aspect of the application.
In some optional embodiments, the supercritical carbon dioxide recycle system further comprises a drive turbine and high speed start-up motor. The air compressor, the high-speed starting motor and the driving turbine are connected through the same rotating shaft and have the same rotating speed during operation. The compressor provides power to compress the working medium to a higher pressure when in operation, the drive turbine is used as a prime motor when the compressor operates under normal or partial load, and the high-speed starting motor is used as a prime motor at the starting stage of the compressor. The design of a coaxial integrated closed structure is adopted, and a gas injection system and a gas extraction system are designed, so that the volume of a gas compressor system can be reduced to the greatest extent, higher efficiency is achieved, and a feasible circulating system is provided for a supercritical carbon dioxide power generation technology.
The implementation of the second aspect of the present application has the beneficial effects of the embodiment of the first aspect of the present application, and details are not repeated here.
Referring to fig. 3, in a third aspect of the present application, a method for controlling a pressure of a compressor is provided, where the method is applied to the compressor provided in any one of the embodiments of the first aspect of the present application, and the method may include:
s100, obtaining a back pressure value of the impeller;
s200, comparing the back pressure value of the impeller with a preset parameter range value, wherein the preset parameter range value comprises a first threshold value and a second threshold value, and the first threshold value is smaller than the second threshold value;
s300, controlling the fluid adjusting device to move relative to the opening to increase the size of the opening under the condition that the pressure value of the back of the impeller is smaller than a first threshold value;
and S400, controlling the fluid adjusting device to move relative to the opening to reduce the size of the opening under the condition that the pressure value of the back of the impeller is larger than a second threshold value.
Optionally, the first threshold and the second threshold constitute a preset parameter range value, and the first threshold is smaller than the second threshold. When the impeller back pressure value is between the first threshold value and the second threshold value, the fluid regulating device does not move relative to the opening. When the pressure value of the back of the impeller is smaller than a first threshold value, the fluid regulating device moves relative to the opening to enlarge the opening, so that the pressure of the balance chamber and the back of the impeller is increased, and the axial force applied to the rotating shaft is further increased. When the pressure value of the back of the impeller is larger than a second threshold value, the fluid regulating device moves relative to the opening to reduce the opening, so that the pressure of the balance chamber and the back of the impeller is reduced, and the axial force applied to the rotating shaft is further reduced.
The pressure of the balance cavity can be changed, and then the pressure on the back of the impeller can be adaptively adjusted, so that the requirements of the compressor on the axial force and the sealing pressure in different running states can be met.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also be determined from a and/or other information.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A compressor, comprising:
the balance chamber is arranged on one side of the air outlet, which is far away from the air inlet, and is provided with an opening communicated with the outside;
the rotating shaft is arranged on the shell, an airflow channel is formed between the rotating shaft and the shell, and the airflow channel is communicated with the accommodating cavity and the balance cavity;
the impeller is sleeved on the air compressing rotating shaft and arranged in the accommodating cavity;
a first seal member disposed in the airflow passage;
the fluid adjusting device is arranged at the opening and is movably connected with the shell so as to adjust the size of the opening.
2. The compressor of claim 1, wherein the housing includes a first side wall and a second side wall opposite to each other in an axial direction of the rotating shaft, the receiving chamber and the balancing chamber are disposed on opposite sides of the first side wall, the balancing chamber is formed between the first side wall and the second side wall, and the airflow passage is formed between the first side wall and the rotating shaft.
3. The compressor of claim 2, wherein the housing further includes an air guide channel disposed in the first sidewall, the air guide channel communicating the air outlet and the first seal.
4. The compressor of claim 2, wherein a gap is defined between the second sidewall and the shaft in communication with the balancing chamber, the compressor further comprising a second seal disposed in the gap to seal the balancing chamber.
5. The compressor of claim 1, wherein the fluid regulating device comprises an elastic member, two magnetic members and a piston, the two magnetic members are connected with two ends of the elastic member along the axial direction of the rotating shaft, and the piston is connected with one magnetic member along the axial direction.
6. An air compressor according to any one of claims 1 to 5, wherein the balance chamber comprises an air duct, and both ends of the air duct are respectively connected with the opening and the air outlet.
7. The compressor of any one of claims 1 to 5, further comprising a pressure pick-up device.
8. A supercritical carbon dioxide recycle system, the system comprising: an air compressor as claimed in any one of claims 1 to 7.
9. The system of claim 8, further comprising: the high-speed starting motor is connected with the gas compressor, the high-speed starting motor and the driving turbine through the same rotating shaft.
10. A compressor pressure control method applied to the compressor according to any one of claims 1 to 7, characterized by comprising:
acquiring a pressure value of the back of the impeller;
comparing the pressure value of the back of the impeller with a preset parameter range value, wherein the preset parameter range value comprises a first threshold value and a second threshold value, and the first threshold value is smaller than the second threshold value;
controlling the fluid regulating device to move relative to the opening to increase the size of the opening under the condition that the pressure value of the back of the impeller is smaller than a first threshold value;
and controlling the fluid regulating device to move relative to the opening to reduce the size of the opening under the condition that the pressure value of the back of the impeller is larger than a second threshold value.
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| CN118504176A (en) * | 2024-07-22 | 2024-08-16 | 中国核动力研究设计院 | Supercritical carbon dioxide compressor design method |
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