CN114215720B - Starting and running adjusting method of supercritical carbon dioxide circulating compressor - Google Patents
Starting and running adjusting method of supercritical carbon dioxide circulating compressor Download PDFInfo
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- CN114215720B CN114215720B CN202111420408.0A CN202111420408A CN114215720B CN 114215720 B CN114215720 B CN 114215720B CN 202111420408 A CN202111420408 A CN 202111420408A CN 114215720 B CN114215720 B CN 114215720B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 365
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 182
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000872 buffer Substances 0.000 claims abstract description 111
- 239000012464 large buffer Substances 0.000 claims abstract description 76
- 230000001502 supplementing effect Effects 0.000 claims abstract description 31
- 238000010992 reflux Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 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
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram 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
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Carbon And Carbon Compounds (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a method for starting and running regulation of a supercritical carbon dioxide circulating compressor, which comprises the steps of closing valves between a large buffer tank and a small buffer tank, a compressor and a heat regenerator before the compressor is started, opening valves between an air supplementing unit and the large buffer tank and the small buffer tank, filling the large buffer tank and the small buffer tank to a starting pressure, closing the valve in front of the small buffer tank, and filling the large buffer tank to a normal working pressure; and then closing a valve in front of the large buffer tank, opening the valve in front of and behind the small buffer tank, the valve between the small buffer tank and the heat regenerator, starting the compressor, increasing the speed to the starting rotating speed, inflating the small buffer tank to the starting pressure by the air supplementing 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 the working rotating speed, then opening the valve between the large buffer tank and the heat regenerator, and closing the valve in front of and behind the small buffer tank and the valve 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 starting and running regulation of a supercritical carbon dioxide circulating compressor, which is suitable for starting and running regulation of the compressor in the supercritical carbon dioxide closed circulation.
Background
Along with the development of social economy, the volume and the efficiency of equipment are required to be higher and higher, various power equipment are developed towards the directions of high temperature, high pressure and high rotating speed, and a supercritical carbon dioxide power generation system belongs to one of power systems, and takes supercritical carbon dioxide as a working medium to convert heat of a heat source into mechanical energy, wherein 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 lead the system to have good application prospect and research value. In the supercritical carbon dioxide closed cycle, as a key component, the design inlet pressure of the supercritical carbon dioxide compressor is large, and for a single-end cantilever compressor, if the compressor is started under the design pressure, the axial force is large during starting, the design requirement on the bearing is high, and the compressor is difficult to start. In addition, in closed cycle operation, how to adjust the operation condition of the compressor, different compressor loads are realized, and the system performance is also obviously affected. Therefore, there is a need to study a convenient and feasible method for starting and operating a supercritical carbon dioxide recycle compressor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a starting and running adjusting method of a supercritical carbon dioxide circulating compressor, which is simple, feasible, safe and reliable.
In order to achieve the purpose, the invention adopts the following technical scheme:
a start and operation regulating system of a supercritical carbon dioxide circulating compressor comprises a supercritical carbon dioxide air supplementing unit, a large buffer tank, a small buffer tank, a carbon dioxide compressor, a heat regenerator, an electric heater, a turbine and other devices, and is characterized in that,
the exhaust pipeline of the supercritical carbon dioxide air supplementing unit is communicated with the inlet of the large buffer tank through a first connecting pipeline and the inlet of the small buffer tank through a second connecting pipeline, and control valves are arranged on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit;
the air inlet of the carbon dioxide compressor is respectively communicated with the outlet of the large buffer tank through a third connecting pipeline and the outlet of the small buffer tank through a fourth connecting pipeline, 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 reflux port of the small buffer tank through a reflux pipeline;
the outlet of the heat regenerator is respectively communicated with the reflux port of the large buffer tank through a fifth connecting pipeline and the reflux 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, closing control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline, opening control valves on an exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit, pressurizing the large buffer tank and the small buffer tank to the starting pressure of the carbon dioxide compressor, closing a valve on the second connecting pipeline before the small buffer tank, pressurizing the large buffer tank to the normal working pressure of the carbon dioxide compressor, and enabling the normal working pressure of the carbon dioxide compressor to be larger 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 a valve of a second connecting pipeline and a valve of a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve of 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, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air supplementing unit; then, control valves on the first connecting pipeline and the second connecting pipeline are opened, so that the large buffer tank and the small buffer tank are communicated, and the rotating speed of the carbon dioxide compressor is continuously increased 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, and closing a control valve on a second connecting pipeline, a fourth connecting pipeline and a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator before and after the small buffer tank.
The supercritical carbon dioxide circulating system consists of a supercritical carbon dioxide air 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 other devices. Before the carbon dioxide compressor is started, valves between the large buffer tank and the small buffer tank, the carbon dioxide compressor and the heat regenerator are closed, valves between the supercritical carbon dioxide air supplementing unit and the large buffer tank and between the supercritical carbon dioxide air supplementing unit and the small buffer tank are opened, the large buffer tank and the small buffer tank are filled to the starting pressure, then the valves in front of the small buffer tank are closed, and the large buffer tank is filled to the normal working pressure; and then closing a valve in front of the large buffer tank, opening the valve in front of and behind the small buffer tank, the valve between the small buffer tank and the heat regenerator, starting the carbon dioxide compressor, accelerating to a starting rotating speed, inflating the supercritical carbon dioxide air supplementing unit to the small buffer tank to the inlet pressure of the carbon dioxide compressor when the carbon dioxide compressor works normally, 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 the working rotating speed, then opening the valve between the large buffer tank and the heat regenerator, and closing the valve in front of and behind the small buffer tank and the valve between the small buffer tank and the heat regenerator. Through the technical scheme, the axial force of the carbon dioxide compressor during starting can be reduced, so that the carbon dioxide compressor can reach a normal working state relatively quickly, and the starting time is saved.
In a preferred embodiment of the invention, when the flow rate of the carbon dioxide compressor is greater than the flow rate required by the circulation system in the operation process of the circulation system, a control valve on the return pipeline is opened, part of carbon dioxide in the circulation loop of the carbon dioxide compressor enters the small buffer tank, the carbon dioxide amount in the circulation 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 an expected value, the control valve on the return pipeline is closed. Through the technical scheme, excessive carbon dioxide in circulation can be recovered through the small buffer tank, waste of a carbon dioxide gas source is reduced, and meanwhile, the risk of dry ice blockage possibly caused by directly discharging high-pressure carbon dioxide to the atmosphere is avoided.
In a preferred embodiment of the present invention, when the flow rate of the carbon dioxide compressor is smaller than the flow rate required by the circulation system in the operation process of 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, the flow rate of the carbon dioxide compressor is increased, and when the flow rate of the carbon dioxide compressor reaches the expected 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 system carbon dioxide, so that the carbon dioxide can be reused, and meanwhile, the rapid regulation of supercritical carbon dioxide circulation is realized.
In a preferred embodiment of the present invention, the large buffer tank has a volume n times that of the small buffer tank, where n=1, 2,3,4, … … 1000. Through the technical scheme, the small buffer tank can be utilized to realize the rapid starting of the supercritical carbon dioxide circulation, and the large buffer tank can be utilized to ensure the stability of the system working condition when the supercritical carbon dioxide circulation normally runs.
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 the technical scheme, low-pressure starting can be realized, the starting pressure of the carbon dioxide compressor is reduced, and the safe starting of the compressor is ensured.
Another object of the present invention is to provide a method for starting and operating a supercritical carbon dioxide recycle compressor based on the above system, characterized in that,
before the carbon dioxide compressor is started, closing control valves on the third connecting pipeline, the fourth connecting pipeline, the fifth connecting pipeline, the sixth connecting pipeline and the return pipeline, opening control valves on an exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit, pressurizing the large buffer tank and the small buffer tank to the starting pressure of the carbon dioxide compressor, closing a valve on the second connecting pipeline before the small buffer tank, pressurizing the large buffer tank to the normal working pressure of the carbon dioxide compressor, and enabling the normal working pressure of the carbon dioxide compressor to be larger 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 a valve of a second connecting pipeline and a valve of a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a valve of 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, and inflating the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air supplementing unit; then, control valves on the first connecting pipeline and the second connecting pipeline are opened, so that the large buffer tank and the small buffer tank are communicated, and the rotating speed of the carbon dioxide compressor is continuously increased 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, and closing a control valve on a second connecting pipeline, a fourth connecting pipeline and a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator before and after the small buffer tank.
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 reach a normal working state faster, and the starting time is saved.
2. The low-pressure start can be realized, the start pressure of the carbon dioxide compressor is reduced, and the safe start of the carbon dioxide compressor is ensured.
3. When the carbon dioxide stock in the closed cycle needs to be reduced, the excessive carbon dioxide can be recovered through the small buffer tank, so that 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 system carbon dioxide, so that the carbon dioxide can be recycled, and meanwhile, the rapid regulation of the supercritical carbon dioxide circulation is realized.
5. The small buffer tank can be utilized to realize the quick start of supercritical carbon dioxide circulation, and the large buffer tank can be utilized to ensure the stability of the system working condition when the supercritical carbon dioxide circulation normally runs.
Drawings
FIG. 1 is a schematic diagram of a start-up and operation regulation system of a supercritical carbon dioxide recycle compressor according to the present invention, wherein 1, a supercritical carbon dioxide make-up unit; 2. a large buffer tank; 3. a small buffer tank; 4. a carbon dioxide compressor; 5. a regenerator, an electric heater, a turbine and other devices; 6-13, controlling the valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention become more apparent, 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 are intended to be illustrative of the invention and should not be construed as limiting the invention in any way. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the starting and running regulating system of the supercritical carbon dioxide circulating compressor comprises a supercritical carbon dioxide air supplementing unit 1, a large buffer tank 2, a small buffer tank 3, a carbon dioxide compressor 4, a regenerator, an electric heater, a turbine and other devices 5, wherein an exhaust pipeline of the supercritical carbon dioxide air 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 arranged on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit 1; the air inlet of the carbon dioxide compressor 4 is respectively communicated with the outlet of the large buffer tank 2 through a third connecting pipeline and the 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; the exhaust port of the carbon dioxide compressor 4 is communicated with the inlet of the heat regenerator 5 through a main flow pipeline and is also communicated with the reflux port of the small buffer tank 3 through a reflux pipeline; the outlet of the heat regenerator 5 is respectively communicated with the reflux inlet of the large buffer tank 2 through a fifth connecting pipeline and the reflux inlet of the small buffer tank 3 through a sixth connecting pipeline, and control valves 11 and 12 are 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 control valves 6-8 on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit 1 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 before 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 higher than the starting pressure of the carbon dioxide compressor; then, the valve 7 of the first connecting pipeline in front of the large buffer tank 8 is closed, the valves 8 and 10 of the second connecting pipeline and the fourth connecting pipeline in front and behind the small buffer tank 3 are opened, and simultaneously, the valve 12 of the sixth connecting pipeline between the heat regenerator 5 and the small buffer tank 3 is opened, the carbon dioxide compressor 4 is started and is accelerated to the starting rotating speed, and the supercritical carbon dioxide air supplementing unit 1 charges the small buffer tank 3 to the normal working pressure of the carbon dioxide compressor; then, control valves 7 and 8 on the first connecting pipeline and the second connecting pipeline are opened, so that the large buffer tank 2 and the small buffer tank 3 are communicated, and the rotating speed of the carbon dioxide compressor 4 is continuously increased to the working rotating speed; then, a control valve 11 on a fifth connecting pipeline between the large buffer tank 2 and the regenerator 5 is opened, a second connecting pipeline before and after the small buffer tank 3, control valves 8 and 10 on a fourth connecting pipeline and a control valve 12 on a sixth connecting pipeline between the small buffer tank 3 and the regenerator 5 are closed.
More specifically, as shown in fig. 1, the starting and running regulating system of the supercritical carbon dioxide circulating compressor of the invention consists of a supercritical carbon dioxide air supplementing unit 1, a large buffer tank 2, a small buffer tank 3, a carbon dioxide compressor 4, valves 6-13, a regenerator, an electric heater, a turbine and other equipment 5. The supercritical carbon dioxide air 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 15m 3 Small buffer tank3 volume of 3m 3 The supercritical carbon dioxide air 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 the carbon dioxide compressor 4, the large buffer tank 2, the small buffer tank 3 and the carbon dioxide compressor 4 are respectively provided with valves 9 and 10, the carbon dioxide compressor 4 is connected with a regenerator, an electric heater, a turbine and other devices 5, the valve 13 is arranged between an outlet of the carbon dioxide compressor 4 and the small buffer tank 3, and carbon dioxide flows through the regenerator, the electric heater, the turbine and other devices 5 and returns to the large buffer tank 2 and the small buffer tank 3, and the valves 11 and 12 are respectively arranged between the large buffer tank 2, the small buffer tank 3 and the regenerator 5.
Before the carbon dioxide compressor 4 is started, valves 9-13 between the large buffer tank 2 and the small buffer tank 3 and the carbon dioxide compressor 4 and between the supercritical carbon dioxide air supplementing unit 1 and the large buffer tank 2 and between the supercritical carbon dioxide air supplementing unit 3 and the small buffer tank 3 are closed, valves 6-8 between the large buffer tank 2 and the small buffer tank 3 are opened, the large buffer tank 2 and the small buffer tank 3 are filled to the starting pressure of 2MPa, then the valves 8 before the small buffer tank 3 are closed, and the large buffer tank 2 is filled to the normal working pressure of 8MPa; then, the valve 7 in front of the large buffer tank 8 is closed, 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, the electric heater, the turbine and other devices 5 are opened, the carbon dioxide compressor 4 is started and is accelerated to the starting rotation speed of 4000rpm-5000rpm, the supercritical carbon dioxide air supplementing unit 1 charges the small buffer tank 3 to the starting pressure of 8MPa, then the communication valve 7-9 between the large buffer tank 2 and the small buffer tank 3 is opened, the rotation speed of the carbon dioxide compressor 4 is continuously increased to the working rotation speed, then the 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 the normal working state faster, 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, a valve 13 between the small buffer tank 3 and the outlet of the compressor 4 is opened, and excessive carbon dioxide is recovered to the small buffer tank 3, so that the waste of a carbon dioxide gas source and carbon dioxide compression energy is reduced.
When the flow rate of the carbon dioxide compressor 4 is smaller than the flow rate 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 meanwhile, the rapid adjustment of the supercritical carbon dioxide circulating flow is realized.
The object of the present invention is fully effectively achieved by the above-described embodiments. Those skilled in the art will appreciate that the present invention includes, but is not limited to, those illustrated in the drawings and described in 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 limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Claims (6)
1. A start and operation regulating system of a supercritical carbon dioxide circulating compressor comprises a supercritical carbon dioxide air supplementing unit, a large buffer tank, a small buffer tank, a carbon dioxide compressor, a heat regenerator, an electric heater and a turbine, and is characterized in that,
the exhaust pipeline of the supercritical carbon dioxide air supplementing unit is communicated with the inlet of the large buffer tank through a first connecting pipeline and the inlet of the small buffer tank through a second connecting pipeline, and control valves are arranged on the exhaust pipeline, the first connecting pipeline and the second connecting pipeline of the supercritical carbon dioxide air supplementing unit;
the air inlet of the carbon dioxide compressor is communicated with the outlet of the large buffer tank through a third connecting pipeline and the outlet of the small buffer tank through a fourth connecting pipeline, 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 reflux port of the small buffer tank through a reflux pipeline;
the outlet of the heat regenerator is communicated with the reflux port of the large buffer tank through a fifth connecting pipeline, and is communicated with the reflux 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 air 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 control valve on the second connecting pipeline before 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 larger than the starting pressure of the carbon dioxide compressor;
then closing a control valve of a first connecting pipeline in front of the large buffer tank, opening a control valve of a second connecting pipeline and a control valve of a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a control valve of 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, and charging the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air supplementing unit; then, control valves on the first connecting pipeline and the second connecting pipeline are opened, so that the large buffer tank and the small buffer tank are communicated, and the rotating speed of the carbon dioxide compressor is continuously increased 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, and closing a control valve on a second connecting pipeline, a fourth connecting pipeline and a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator before and after the small buffer tank.
2. The system according to claim 1, wherein the control valve on the return line is opened when the flow rate of the carbon dioxide compressor is greater than the flow rate required by the circulation system during the operation of the circulation system, 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, thereby reducing the flow rate of the carbon dioxide compressor, and the control valve on the return line is closed after the flow rate of the carbon dioxide compressor reaches the desired value.
3. The system according to claim 1, wherein in the operation 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 and second connection lines 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, the flow rate of the carbon dioxide compressor is increased, and when the flow rate of the carbon dioxide compressor reaches an expected value, the control valves on the first and second connection lines are closed.
4. The start-up and operation regulation system of a supercritical carbon dioxide cycle compressor of claim 1, wherein the large buffer tank has a volume n times that of the small buffer tank, wherein n = 1,2,3,4, … … 1000.
5. The start-up and operation regulation system of a supercritical carbon dioxide recycle compressor according to claim 1 wherein the start-up pressure of the carbon dioxide compressor is lower than the normal operating pressure.
6. A method for regulating the start-up and operation of a supercritical carbon dioxide recycle compressor, which is based on the start-up and operation regulating system of the supercritical carbon dioxide recycle compressor as set forth in any one 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 air 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 control valve on the second connecting pipeline before 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 larger than the starting pressure of the carbon dioxide compressor;
then closing a control valve of a first connecting pipeline in front of the large buffer tank, opening a control valve of a second connecting pipeline and a control valve of a fourth connecting pipeline in front of and behind the small buffer tank, simultaneously opening a control valve of 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, and charging the small buffer tank to the normal working pressure of the carbon dioxide compressor by the supercritical carbon dioxide air supplementing unit; then, control valves on the first connecting pipeline and the second connecting pipeline are opened, so that the large buffer tank and the small buffer tank are communicated, and the rotating speed of the carbon dioxide compressor is continuously increased 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, and closing a control valve on a second connecting pipeline, a fourth connecting pipeline and a control valve on a sixth connecting pipeline between the small buffer tank and the heat regenerator before and after the small buffer tank.
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| 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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| 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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