CN114215720A - Method for adjusting starting and running of supercritical carbon dioxide circulating compressor - Google Patents
Method for adjusting starting and running of supercritical carbon dioxide circulating compressor Download PDFInfo
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- CN114215720A CN114215720A CN202111420408.0A CN202111420408A CN114215720A CN 114215720 A CN114215720 A CN 114215720A CN 202111420408 A CN202111420408 A CN 202111420408A CN 114215720 A CN114215720 A CN 114215720A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 371
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 185
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 185
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000872 buffer Substances 0.000 claims abstract description 110
- 239000012464 large buffer Substances 0.000 claims abstract description 75
- 230000001502 supplementing effect Effects 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 25
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a method for adjusting the starting and running of a supercritical carbon dioxide circulating compressor, which comprises the steps of before the compressor is started, closing valves between a large buffer tank and a small buffer tank and between the compressor and a heat regenerator, opening a valve between an air supply unit and the large buffer tank and between the air supply unit and the small buffer tank, filling the large buffer tank and the small buffer tank to starting pressure, then closing the valve in front of the small buffer tank, and filling the large buffer tank to normal working pressure; and then closing a valve in front of the large buffer tank, opening valves in front of and behind the small buffer tank and valves between the small buffer tank and the heat regenerator, starting the compressor and accelerating to a starting rotating speed, inflating the small buffer tank to a starting pressure by the air inflation unit, then opening a communication valve between the large buffer tank and the small buffer tank, continuously increasing the rotating speed of the compressor to a working rotating speed, then opening the valves between the large buffer tank and the heat regenerator, and closing the valves in front of and behind the small buffer tank and the valves between the small buffer tank and the heat regenerator.
Description
Technical Field
The invention belongs to the technical field of compressors, and particularly provides a method for adjusting the starting and the operation of a supercritical carbon dioxide circulating compressor, which is suitable for adjusting the starting and the operation of the supercritical carbon dioxide closed circulating compressor.
Background
Along with the development of social economy, higher and higher requirements are provided for the volume and the efficiency of equipment, various power equipment develops towards the directions of high temperature, high pressure and high rotating speed, a supercritical carbon dioxide power generation system belongs to one of power systems, carbon dioxide in a supercritical state is used as a working medium, the heat of a heat source is converted into mechanical energy, and the heat source can be from a nuclear reactor, solar energy, geothermal energy, industrial waste heat, chemical fuel combustion and the like. The excellent characteristics of the supercritical carbon dioxide working medium enable the system to have good application prospect and research value. In the supercritical carbon dioxide closed cycle, as a key component, the designed inlet pressure of the supercritical carbon dioxide compressor is large, and for a single-end cantilever type compressor, if the compressor is started under the designed pressure, the axial force during starting is large, the design requirement on a bearing is high, and the compressor is difficult to start. In addition, in the closed cycle operation, how to adjust the operation condition of the compressor and realize different compressor loads also can obviously influence the system performance. Therefore, there is a need to develop a convenient and feasible method for adjusting the start-up and operation of the supercritical carbon dioxide recycle compressor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for adjusting the starting and the operation of a supercritical carbon dioxide circulating compressor, which is simple, feasible, safe and reliable.
In order to realize the purpose, the invention adopts the following technical scheme:
a start and operation adjusting system of a supercritical carbon dioxide circulating compressor comprises a supercritical carbon dioxide gas supplementing unit, a large buffer tank, a small buffer tank, a carbon dioxide compressor, a heat regenerator, an electric heater, a turbine and the like,
the gas exhaust pipeline of the supercritical carbon dioxide gas supplementing unit is communicated with the inlet of the large buffer tank through a first connecting pipeline and is communicated with the inlet of the small buffer tank through a second connecting pipeline, and control valves are arranged on the gas exhaust pipeline of the supercritical carbon dioxide gas supplementing unit, the first connecting pipeline and the second connecting pipeline;
an air inlet of the carbon dioxide compressor is communicated with an outlet of the large buffer tank through a third connecting pipeline and is communicated with an outlet of the small buffer tank through a fourth connecting pipeline respectively, and control valves are arranged on the third connecting pipeline and the fourth connecting pipeline;
the exhaust port of the carbon dioxide compressor is communicated with the inlet of the heat regenerator through a main flow pipeline and is also communicated with the return port of the small buffer tank through a return pipeline;
the outlet of the heat regenerator is respectively communicated with the backflow port of the large buffer tank through a fifth connecting pipeline and the backflow port of the small buffer tank through a sixth connecting pipeline, and control valves are arranged on the fifth connecting pipeline and the sixth connecting pipeline;
before the carbon dioxide compressor is started, the control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline are closed, the control valves on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide gas supplementing unit are opened, the large buffer tank and the small buffer tank are pressurized to the starting pressure of the carbon dioxide compressor, then the valve on the second connecting pipeline in front of the small buffer tank is closed, the large buffer tank is pressurized to the normal working pressure of the carbon dioxide compressor, and the normal working pressure of the carbon dioxide compressor is greater than the starting pressure of the carbon dioxide compressor;
then, closing a valve of a first connecting pipeline in front of the large buffer tank, opening valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve on a sixth connecting pipeline between the heat regenerator and the small buffer tank, starting the carbon dioxide compressor and accelerating to the starting rotating speed of the carbon dioxide compressor, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air replenishing unit; then opening control valves on the first connecting pipeline and the second connecting pipeline to enable the large buffer tank and the small buffer tank to be communicated, and continuously increasing the rotating speed of the carbon dioxide compressor to the working rotating speed; and then opening a control valve on a fifth connecting pipeline between the large buffer tank and the heat regenerator, closing control valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, and closing a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator.
The invention relates to a supercritical carbon dioxide circulating system, which consists of a supercritical carbon dioxide gas supplementing unit, a large buffer tank, a small buffer tank, a carbon dioxide compressor, a valve, a heat regenerator, an electric heater, a turbine and the like. Before the carbon dioxide compressor is started, valves between a large buffer tank and a small buffer tank and between the carbon dioxide compressor and a heat regenerator are closed, valves between a supercritical carbon dioxide gas supplementing unit and between the large buffer tank and the small buffer tank are opened, the large buffer tank and the small buffer tank are charged to starting pressure, then the valve in front of the small buffer tank is closed, and the large buffer tank is charged to normal working pressure; and then closing a valve in front of the large buffer tank, opening valves in front of and behind the small buffer tank and a valve between the small buffer tank and the heat regenerator, starting the carbon dioxide compressor and accelerating to a starting rotating speed, inflating the small buffer tank to the inlet pressure of the carbon dioxide compressor during normal operation by the supercritical carbon dioxide gas supplementing unit, then opening a communication valve between the large buffer tank and the small buffer tank, continuously increasing the rotating speed of the carbon dioxide compressor to a working rotating speed, then opening the valve between the large buffer tank and the heat regenerator, and closing the valves in front of and behind the small buffer tank and the valve between the small buffer tank and the heat regenerator. Through above-mentioned technical scheme, the axial force when can reduce the carbon dioxide compressor and start makes the carbon dioxide compressor reach normal operating condition sooner, saves the start-up time.
In a preferred embodiment of the present invention, during the operation of the circulation system, when the flow rate of the carbon dioxide compressor is greater than the flow rate required by the circulation system, the control valve on the return line is opened, a part of carbon dioxide in the circulation loop of the carbon dioxide compressor enters the small buffer tank, the amount of carbon dioxide in the circulation loop is reduced, the inlet pressure of the carbon dioxide compressor is reduced, so as to reduce the flow rate of the carbon dioxide compressor, and when the flow rate of the carbon dioxide compressor reaches a desired value, the control valve on the return line is closed. Through above-mentioned technical scheme, can retrieve excessive carbon dioxide in will circulating through little buffer tank, reduce the waste of carbon dioxide air supply, avoid directly discharging the dry ice that the atmosphere probably caused with high-pressure carbon dioxide and block up the risk simultaneously.
In a preferred embodiment of the present invention, in the operation process of the circulation system, when the flow rate of the carbon dioxide compressor is smaller than the flow rate required by the circulation system, the control valves on the first connection pipeline and the second connection pipeline are opened, so that the carbon dioxide in the small buffer tank enters the large buffer tank, the inlet pressure of the carbon dioxide compressor is increased, thereby increasing the flow rate of the carbon dioxide compressor, and when the flow rate of the carbon dioxide compressor reaches a desired value, the control valves on the first connection pipeline and the second connection pipeline are closed. Through the technical scheme, the recovered carbon dioxide can be used as the supply of the carbon dioxide of the system, so that the carbon dioxide can be recycled, and the rapid adjustment of the circulation of the supercritical carbon dioxide is realized.
In a preferred embodiment of the present invention, the volume of the large buffer tank is n times that of the small buffer tank, where n is 1, 2, 3, 4, … … 1000. Through the technical scheme, the rapid start of the supercritical carbon dioxide circulation can be realized by using the small buffer tank, and the stability of the system working condition in the normal operation of the supercritical carbon dioxide circulation can be ensured by using the large buffer tank.
In a preferred embodiment of the present invention, the start-up pressure of the supercritical carbon dioxide compressor is lower than the normal operating pressure. Through above-mentioned technical scheme, can realize the low pressure and start, reduce the starting pressure of carbon dioxide compressor, ensure the safe start-up of compressor.
Another object of the present invention is to provide a method for adjusting the start-up and operation of a supercritical carbon dioxide recycle compressor based on the above system, which is characterized in that,
before the carbon dioxide compressor is started, the control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline are closed, the control valves on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide gas supplementing unit are opened, the large buffer tank and the small buffer tank are pressurized to the starting pressure of the carbon dioxide compressor, then the valve on the second connecting pipeline in front of the small buffer tank is closed, the large buffer tank is pressurized to the normal working pressure of the carbon dioxide compressor, and the normal working pressure of the carbon dioxide compressor is greater than the starting pressure of the carbon dioxide compressor;
then, closing a valve of a first connecting pipeline in front of the large buffer tank, opening valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve on a sixth connecting pipeline between the heat regenerator and the small buffer tank, starting the carbon dioxide compressor and accelerating to the starting rotating speed of the carbon dioxide compressor, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air replenishing unit; then opening control valves on the first connecting pipeline and the second connecting pipeline to enable the large buffer tank and the small buffer tank to be communicated, and continuously increasing the rotating speed of the carbon dioxide compressor to the working rotating speed; and then opening a control valve on a fifth connecting pipeline between the large buffer tank and the heat regenerator, closing control valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, and closing a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the axial force of the carbon dioxide compressor during starting can be reduced, so that the carbon dioxide compressor can quickly reach a normal working state, and the starting time is saved.
2. The low-pressure starting can be realized, the starting pressure of the carbon dioxide compressor is reduced, and the safe starting of the carbon dioxide compressor is guaranteed.
3. When the carbon dioxide storage amount in the closed circulation needs to be reduced, the excessive carbon dioxide can be recovered through the small buffer tank, and the waste of a carbon dioxide gas source is reduced.
4. When the carbon dioxide storage in the closed circulation needs to be increased, the recovered carbon dioxide can be used as the supply of the carbon dioxide of the system, so that the carbon dioxide can be recycled, and the rapid adjustment of the supercritical carbon dioxide circulation is realized.
5. The small buffer tank can be used for realizing the quick start of the supercritical carbon dioxide circulation, and the large buffer tank can be used for ensuring the stability of the system working condition when the supercritical carbon dioxide circulation normally operates.
Drawings
FIG. 1 is a schematic view of a system for regulating the start-up and operation of a supercritical carbon dioxide recycle compressor according to the present invention, wherein 1, a supercritical carbon dioxide gas supplementing unit; 2. a large buffer tank; 3. a small buffer tank; 4. a carbon dioxide compressor; 5. equipment such as a heat regenerator, an electric heater, a turbine and the like; 6-13 and a control valve.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments, which are part of the present invention, are not all embodiments, and are intended to be illustrative of the present invention and should not be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the start and operation regulation system of the supercritical carbon dioxide recycle compressor of the present invention comprises a supercritical carbon dioxide gas supplementing unit 1, a large buffer tank 2, a small buffer tank 3, a carbon dioxide compressor 4, a heat regenerator, an electric heater, a turbine and other devices 5, wherein a gas exhaust line of the supercritical carbon dioxide gas supplementing unit 1 is communicated with an inlet of the large buffer tank 2 through a first connecting pipeline and is communicated with an inlet of the small buffer tank 3 through a second connecting pipeline, and control valves 6, 7 and 8 are respectively arranged on the gas exhaust line, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide gas supplementing unit 1; an air inlet of the carbon dioxide compressor 4 is respectively communicated with an outlet of the large buffer tank 2 through a third connecting pipeline and is communicated with an outlet of the small buffer tank 3 through a fourth connecting pipeline, and control valves 9 and 10 are respectively arranged on the third connecting pipeline and the fourth connecting pipeline; an exhaust port of the carbon dioxide compressor 4 is communicated with an inlet of the heat regenerator 5 through a main flow pipeline and is also communicated with a return port of the small buffer tank 3 through a return pipeline; an outlet of the heat regenerator 5 is respectively communicated with a return port of the large buffer tank 2 through a fifth connecting pipeline and is communicated with a return port of the small buffer tank 3 through a sixth connecting pipeline, and control valves 11 and 12 are respectively arranged on the fifth connecting pipeline and the sixth connecting pipeline; before the carbon dioxide compressor is started, the control valves 9-13 on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline are closed, the exhaust pipeline of the supercritical carbon dioxide gas supplementing unit 1, the control valves 6-8 on the first connecting pipeline and the second connecting pipeline are opened, the large buffer tank and the small buffer tank are pressurized to the starting pressure of the carbon dioxide compressor, then the valve 8 on the second connecting pipeline in front of the small buffer tank 3 is closed, the large buffer tank 2 is pressurized to the normal working pressure of the carbon dioxide compressor, and the normal working pressure of the carbon dioxide compressor is greater than the starting pressure of the carbon dioxide compressor; next, closing a valve 7 of a first connecting pipeline in front of the large buffer tank 8, opening valves 8 and 10 on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank 3, simultaneously opening a valve 12 on a sixth connecting pipeline between the heat regenerator 5 and the small buffer tank 3, starting the carbon dioxide compressor 4 and accelerating to the starting rotating speed of the carbon dioxide compressor, and inflating the small buffer tank 3 to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air replenishing unit 1; then opening control valves 7 and 8 on the first connecting pipeline and the second connecting pipeline to communicate the large buffer tank 2 with the small buffer tank 3, and continuously increasing the rotating speed of the carbon dioxide compressor 4 to the working rotating speed; and then opening a control valve 11 on a fifth connecting pipeline between the large buffer tank 2 and the heat regenerator 5, closing control valves 8 and 10 on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank 3 and a control valve 12 on a sixth connecting pipeline between the small buffer tank 3 and the heat regenerator 5.
More specifically, as shown in fig. 1, the start and operation regulation system of the supercritical carbon dioxide recycle compressor of the present invention is composed of a supercritical carbon dioxide gas supply unit 1, a large buffer tank 2, a small buffer tank 3, a carbon dioxide compressor 4, valves 6 to 13, and a heat regenerator, an electric heater, a turbine, and other devices 5. The back of the supercritical carbon dioxide gas supplementing unit 1 is connected with a large buffer tank 2 and a small buffer tank 3, and the volume of the large buffer tank 2 is 15m3The volume of the small buffer tank 3 is 3m3The supercritical carbon dioxide gas supplementing unit 1, the large buffer tank 2 and the small buffer tank 3 are provided with valves 6-8, the large buffer tank 2 and the small buffer tank 3 are connected with a carbon dioxide compressor 4, valves 9 and 10 are respectively arranged between the large buffer tank 2, the small buffer tank 3 and the carbon dioxide compressor 4, the carbon dioxide compressor 4 is connected with a heat regenerator, an electric heater, a turbine and other equipment 5, a valve 13 is arranged between the outlet of the carbon dioxide compressor 4 and the small buffer tank 3, carbon dioxide flows through the heat regenerator, the electric heater, the turbine and other equipment 5 and then returns to the large buffer tank 2 and the small buffer tank 3, and valves 11 and 12 are respectively arranged between the large buffer tank 2, the small buffer tank 3 and the heat regenerator 5.
Before the carbon dioxide compressor 4 is started, firstly closing valves 9-13 between the large buffer tank 2 and the small buffer tank 3 and between the carbon dioxide compressor 4 and the heat regenerator 5, opening valves 6-8 between the supercritical carbon dioxide gas supplementing unit 1 and the large buffer tank 2 and the small buffer tank 3, filling the large buffer tank 2 and the small buffer tank 3 to a starting pressure of 2MPa, then closing the valve 8 in front of the small buffer tank 3, and filling the large buffer tank 2 to a normal working pressure of 8 MPa; then, a valve 7 in front of the large buffer tank 8 is closed, valves 8 and 10 in front of and behind the small buffer tank 3 and a valve 12 between the small buffer tank 3 and equipment 5 such as a heat regenerator, an electric heater, a turbine and the like are opened, a carbon dioxide compressor 4 is started and is accelerated to a starting speed of 4000rpm-5000rpm, the supercritical carbon dioxide gas supplementing unit 1 charges gas into the small buffer tank 3 to a starting pressure of 8MPa, then a communication valve 7-9 between the large buffer tank 2 and the small buffer tank 3 is opened, the rotating speed of the carbon dioxide compressor 4 is continuously accelerated to a working rotating speed, then a valve 11 between the large buffer tank 2 and the heat regenerator 5 is opened, and the valves 8 and 10 in front of and behind the small buffer tank 3 and the valve 12 between the small buffer tank 3 and the heat regenerator 5 are closed. By adopting the starting method, the axial force of the carbon dioxide compressor 4 during starting can be reduced, so that the carbon dioxide compressor 4 can reach a normal working state quickly, and the starting time is saved.
When the flow of the carbon dioxide compressor 4 is larger than the flow required by the circulating system, the valve 13 between the small buffer tank 3 and the outlet of the compressor 4 is opened, and the excessive carbon dioxide is recovered to the small buffer tank 3, so that the waste of a carbon dioxide gas source and the carbon dioxide compression energy is reduced.
When the flow of the carbon dioxide compressor 4 is less than the flow required by the circulating system, the valves 7 and 8 between the small buffer tank 3 and the large buffer tank 2 are opened. The carbon dioxide in the small buffer tank 3 is supplied to the circulating system, so that the carbon dioxide is recycled, and the rapid regulation of the circulating flow of the supercritical carbon dioxide is realized.
The object of the present invention is fully effectively achieved by the above embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, what is described in the accompanying drawings and the foregoing detailed description. While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications within the spirit and scope of the appended claims.
Claims (6)
1. A start and operation adjusting system of a supercritical carbon dioxide circulating compressor comprises a supercritical carbon dioxide gas supplementing unit, a large buffer tank, a small buffer tank, a carbon dioxide compressor, a heat regenerator, an electric heater, a turbine and the like,
the gas exhaust pipeline of the supercritical carbon dioxide gas supplementing unit is communicated with the inlet of the large buffer tank through a first connecting pipeline and is communicated with the inlet of the small buffer tank through a second connecting pipeline, and control valves are arranged on the gas exhaust pipeline of the supercritical carbon dioxide gas supplementing unit, the first connecting pipeline and the second connecting pipeline;
an air inlet of the carbon dioxide compressor is communicated with an outlet of the large buffer tank through a third connecting pipeline and is communicated with an outlet of the small buffer tank through a fourth connecting pipeline respectively, and control valves are arranged on the third connecting pipeline and the fourth connecting pipeline;
the exhaust port of the carbon dioxide compressor is communicated with the inlet of the heat regenerator through a main flow pipeline and is also communicated with the return port of the small buffer tank through a return pipeline;
the outlet of the heat regenerator is respectively communicated with the backflow port of the large buffer tank through a fifth connecting pipeline and the backflow port of the small buffer tank through a sixth connecting pipeline, and control valves are arranged on the fifth connecting pipeline and the sixth connecting pipeline;
before the carbon dioxide compressor is started, the control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline are closed, the control valves on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide gas supplementing unit are opened, the large buffer tank and the small buffer tank are pressurized to the starting pressure of the carbon dioxide compressor, then the valve on the second connecting pipeline in front of the small buffer tank is closed, the large buffer tank is pressurized to the normal working pressure of the carbon dioxide compressor, and the normal working pressure of the carbon dioxide compressor is greater than the starting pressure of the carbon dioxide compressor;
then, closing a valve of a first connecting pipeline in front of the large buffer tank, opening valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve on a sixth connecting pipeline between the heat regenerator and the small buffer tank, starting the carbon dioxide compressor and accelerating to the starting rotating speed of the carbon dioxide compressor, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air replenishing unit; then opening control valves on the first connecting pipeline and the second connecting pipeline to enable the large buffer tank and the small buffer tank to be communicated, and continuously increasing the rotating speed of the carbon dioxide compressor to the working rotating speed; and then opening a control valve on a fifth connecting pipeline between the large buffer tank and the heat regenerator, closing control valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, and closing a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator.
2. The system for regulating the start-up and operation of a supercritical carbon dioxide recycle compressor according to the above claim, wherein during the operation of the recycle system, when the flow rate of the carbon dioxide compressor is larger than the flow rate required by the recycle system, the control valve on the recycle line is opened, part of carbon dioxide in the recycle loop of the carbon dioxide compressor enters the small buffer tank, the amount of carbon dioxide in the recycle loop is reduced, the inlet pressure of the carbon dioxide compressor is reduced, thereby reducing the flow rate of the carbon dioxide compressor, and when the flow rate of the carbon dioxide compressor reaches the desired value, the control valve on the recycle line is closed.
3. The system for adjusting the start-up and operation of a supercritical carbon dioxide recycle compressor according to the above claim, wherein in the process of the operation of the recycle system, when the flow of the carbon dioxide compressor is smaller than the flow required by the recycle system, the control valves on the first and second connecting pipelines are opened, so that the carbon dioxide in the small buffer tank enters the large buffer tank, the inlet pressure of the carbon dioxide compressor is increased, thereby increasing the flow of the carbon dioxide compressor, and when the flow of the carbon dioxide compressor reaches the desired value, the control valves on the first and second connecting pipelines are closed.
4. The system for regulating the startup and operation of a supercritical carbon dioxide recycle compressor of the preceding claim wherein the large buffer tank has a volume n times that of the small buffer tank, where n is 1, 2, 3, 4, … … 1000.
5. The system for regulating startup and operation of a supercritical carbon dioxide recycle compressor of the preceding claim wherein the startup pressure of the supercritical carbon dioxide compressor is lower than normal operating pressure.
6. A method for adjusting the start-up and operation of a supercritical carbon dioxide recycle compressor, based on the system of claims 1 to 5,
before the carbon dioxide compressor is started, the control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline are closed, the control valves on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide gas supplementing unit are opened, the large buffer tank and the small buffer tank are pressurized to the starting pressure of the carbon dioxide compressor, then the valve on the second connecting pipeline in front of the small buffer tank is closed, the large buffer tank is pressurized to the normal working pressure of the carbon dioxide compressor, and the normal working pressure of the carbon dioxide compressor is greater than the starting pressure of the carbon dioxide compressor;
then, closing a valve of a first connecting pipeline in front of the large buffer tank, opening valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve on a sixth connecting pipeline between the heat regenerator and the small buffer tank, starting the carbon dioxide compressor and accelerating to the starting rotating speed of the carbon dioxide compressor, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air replenishing unit; then opening control valves on the first connecting pipeline and the second connecting pipeline to enable the large buffer tank and the small buffer tank to be communicated, and continuously increasing the rotating speed of the carbon dioxide compressor to the working rotating speed; and then opening a control valve on a fifth connecting pipeline between the large buffer tank and the heat regenerator, closing control valves on a second connecting pipeline and a fourth connecting pipeline in front of and behind the small buffer tank, and closing a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator.
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| US20170167769A1 (en) * | 2013-01-30 | 2017-06-15 | Trane International Inc. | Axial thrust control for rotary compressors |
| CN107131142A (en) * | 2017-07-07 | 2017-09-05 | 中国科学院工程热物理研究所 | The startup control device and method of centrifugal compressor |
| CN211950614U (en) * | 2020-03-18 | 2020-11-17 | 上海朝临动力科技有限公司 | SCO2Brayton cycle power generation device and power generation system |
| CN113187573A (en) * | 2021-05-17 | 2021-07-30 | 西安热工研究院有限公司 | Supercritical carbon dioxide power generation coaxial integrated equipment and displacement type energy storage method |
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|---|---|---|---|---|
| US20170167769A1 (en) * | 2013-01-30 | 2017-06-15 | Trane International Inc. | Axial thrust control for rotary compressors |
| CN107131142A (en) * | 2017-07-07 | 2017-09-05 | 中国科学院工程热物理研究所 | The startup control device and method of centrifugal compressor |
| CN211950614U (en) * | 2020-03-18 | 2020-11-17 | 上海朝临动力科技有限公司 | SCO2Brayton cycle power generation device and power generation system |
| CN113187573A (en) * | 2021-05-17 | 2021-07-30 | 西安热工研究院有限公司 | Supercritical carbon dioxide power generation coaxial integrated equipment and displacement type energy storage method |
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