CN112696242B - A reposition of redundant personnel regulation and control system for supercritical carbon dioxide recompression circulation - Google Patents
A reposition of redundant personnel regulation and control system for supercritical carbon dioxide recompression circulation Download PDFInfo
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- CN112696242B CN112696242B CN202011375486.9A CN202011375486A CN112696242B CN 112696242 B CN112696242 B CN 112696242B CN 202011375486 A CN202011375486 A CN 202011375486A CN 112696242 B CN112696242 B CN 112696242B
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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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Abstract
The invention discloses a shunting regulation and control system for supercritical carbon dioxide recompression circulation, which comprises a carbon dioxide storage subsystem, a carbon dioxide circulating subsystem and a carbon dioxide control subsystem, wherein the carbon dioxide storage subsystem is used for storing carbon dioxide and providing a carbon dioxide source for the recompression circulating subsystem; the recompression circulation subsystem receives the filling of carbon dioxide from the carbon dioxide storage subsystem, and controls the air supplement of the carbon dioxide storage subsystem, the air discharge of the air discharge subsystem and the flow dividing coefficient in the recompression circulation subsystem through the automatic control subsystem so as to realize the stable and continuous circulation operation of the recompression circulation subsystem; the gas discharge subsystem is connected with the recompression circulation subsystem and is used for vacuumizing the recompression circulation subsystem when the recompression circulation subsystem is filled with carbon dioxide; and the automatic control subsystem automatically realizes the filling or air supplement of carbon dioxide, the vacuumizing and air release of the air release subsystem, and the regulation and control of the flow dividing coefficient in the recompression circulation subsystem so as to ensure the stable operation of the system.
Description
Technical Field
The invention relates to the technical field of energy power generation, in particular to a flow-dividing regulation and control system for supercritical carbon dioxide recompression circulation.
Background
The supercritical carbon dioxide Brayton cycle power generation technology is a leading-edge technology for improving the energy utilization rate and is an important way for realizing the green development of energy. Compared with the applied steam Rankine cycle and helium Brayton cycle, the supercritical carbon dioxide recompression Brayton cycle has higher thermal efficiency under the same condition, reduces the sizes of components such as a compressor, a heat exchanger, a turbine and the like, and enables the system to be more easily compact and modularized to construct. During the debugging process of the supercritical carbon dioxide recompression circulation system, the adjustment of the flow dividing coefficient is an important factor influencing the efficiency of the circulation system. Because the property of the supercritical carbon dioxide is suddenly changed near a critical point, when the pressure is close to the critical pressure, the specific heat capacity near the critical temperature is suddenly increased and then reduced; thus, regenerators in supercritical recompression Brayton cycle are prone to pinch problems, resulting in reduced regenerator heat exchanger efficiency. There is a direct correlation between the location of the pinch point and the shunt coefficient. In order to avoid the heat transfer deterioration of the high-temperature and low-temperature heat regenerator of the supercritical carbon dioxide recompression Brayton cycle, the adjustment of the shunting coefficient has important significance on the optimization of the cycle performance.
Due to the particularity of the properties of the supercritical carbon dioxide, the existing other gas diversion systems are not suitable for the supercritical carbon dioxide recompression Brayton cycle system and do not have strong reference value. In the published patent, no flow splitting regulation and control system for the supercritical carbon dioxide recompression brayton cycle exists at present, and a regulation and control method for optimizing the flow splitting ratio of the recompression cycle system needs to be considered in consideration of the influence of the flow splitting coefficient on the position of a heat regenerator pinch point and the cycle performance in the debugging process.
Disclosure of Invention
To avoid and overcome the technical problems in the prior art, the invention provides a flow splitting regulation system for a supercritical carbon dioxide recompression cycle. The invention realizes the adjustment of the shunt coefficient in the system by the assistance and the cooperation of each subsystem, and the problem of difficult pinch point of the circulating system is solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a split-flow conditioning system for use in a supercritical carbon dioxide recompression cycle, the system comprising:
the carbon dioxide storage subsystem is used for storing carbon dioxide, providing a carbon dioxide source for the recompression circulation subsystem and preheating and pressurizing the carbon dioxide during filling or air supplement;
the recompression circulation subsystem is respectively connected with the carbon dioxide storage subsystem and the deflation subsystem, receives the filling of the carbon dioxide from the carbon dioxide storage subsystem, controls the air supplement of the carbon dioxide storage subsystem, controls the deflation of the deflation subsystem and regulates and controls the flow dividing coefficient in the recompression circulation subsystem through the automatic control subsystem so as to realize the stable and continuous circulation operation of the recompression circulation subsystem;
the air bleeding subsystem is connected with the recompression circulation subsystem and is used for vacuumizing the recompression circulation subsystem when the recompression circulation subsystem is filled with carbon dioxide or discharging more carbon dioxide in the recompression circulation subsystem when the recompression circulation subsystem is in regulating operation;
and the automatic control subsystem is used for automatically controlling the carbon dioxide storage subsystem, the recompression circulation subsystem and the deflation subsystem, automatically realizing the filling or air supplement of the carbon dioxide, the vacuumizing and deflation of the deflation subsystem, and regulating and controlling the flow dividing coefficient in the recompression circulation subsystem to enable the carbon dioxide to stably run.
As a further scheme of the invention: the carbon dioxide storage subsystem comprises a low-temperature storage tank, a low-temperature reciprocating pump and a preheater which are sequentially connected in series along the liquid flow direction; the outlet of a gas phase pipeline of the low-temperature storage tank is connected with a gas phase inlet of a filling buffer tank in the recompression circulation subsystem, and the outlet of a liquid phase pipeline of the low-temperature storage tank is connected with a liquid phase inlet of the filling buffer tank in the recompression circulation subsystem through a low-temperature reciprocating pump and a preheater in sequence; the gas phase pipeline is provided with a first shut-off valve, the liquid phase pipeline is provided with a second shut-off valve, the second shut-off valve is arranged to be close to a liquid phase inlet of the filling buffer tank, and an outlet pipeline between the preheater and the second shut-off valve is further provided with a flowmeter.
As a still further scheme of the invention: the automatic control subsystem regulates the operation of the low-temperature reciprocating pump and the preheater through the measurement values of a pressure sensor, a temperature sensor and a flowmeter in the carbon dioxide storage subsystem, and controls the carbon dioxide output pressure and temperature of the carbon dioxide storage subsystem.
As a still further scheme of the invention: the recompression circulation subsystem comprises a filling buffer tank, an outlet end and an inlet end of the filling buffer tank are connected through a circulation pipeline, the circulation pipeline is divided and converged, a precooler, a main compressor and a low-temperature heat regenerator are sequentially arranged on one section of the divided pipeline along the gas flow direction, and a recompressor is arranged on the other section of the divided pipeline; a high-temperature heat regenerator, a heater and a turbine are sequentially arranged on the converged circulating pipeline along the gas flow direction; after passing through a turbine, the gas in the circulating pipeline passes through a high-temperature heat regenerator and a low-temperature heat regenerator in sequence and finally enters a temperature regulator; the circulating pipeline is provided with at least one second flow regulating valve and a flow meter in one section of the branch line, and the circulating pipeline is provided with at least one first flow regulating valve and a flow meter in the confluence section of the branch line;
at least one shut-off valve is arranged in the recompression circulation subsystem; a pressure sensor and a temperature sensor are arranged in the circulating pipeline; the automatic control subsystem adjusts the working condition of the recompression circulation subsystem through the measurement values of the pressure sensor, the temperature sensor and the flowmeter; the circulating pipeline is connected with the air bleeding subsystem through an exhaust pipeline, and a shut-off valve is arranged in the exhaust pipeline and/or the air bleeding subsystem.
As a still further scheme of the invention: a fifth shut-off valve and a sixth shut-off valve are arranged in the bypass pipeline, and a third shut-off valve and a fourth shut-off valve are respectively arranged at the inlet and the outlet of the thermostat; inlets of the fourth shutoff valve and the sixth shutoff valve are connected with a low-pressure side outlet of the low-temperature regenerator, an outlet of the fourth shutoff valve is connected with an inlet of a thermostat, an outlet of the sixth shutoff valve is connected with an inlet of a fifth shutoff valve, an inlet of the third shutoff valve is connected with an outlet of the thermostat, and outlets of the third shutoff valve and the fifth shutoff valve are connected to an inlet of a circulating end of a charging buffer tank;
the inlet side of the precooler, the inlet side of the main compressor, the inlet side of the recompressor, the inlet and outlet sides of the circulating end of the charging buffer tank, the inlet and outlet sides of the low-temperature heat regenerator, the inlet and outlet sides of the high-temperature heat regenerator, the inlet and outlet sides of the heater and the inlet and outlet side of the turbine are all provided with a pressure sensor and a temperature sensor; a pressure control valve is arranged at the outlet of the turbine; the first flow regulating valve is positioned at the inlet of the circulation end of the filling buffer tank, and the second flow regulating valve is positioned at the inlet of the precooler.
As a still further scheme of the invention: the automatic control subsystem adjusts the precooler, the main compressor, the recompressor, the heater and the temperature regulator according to the measured values of the pressure sensor, the temperature sensor and the flow meter which are arranged on the circulating pipeline, so that the operation condition of the recompression circulating subsystem reaches a relatively stable state, and then the recompression circulating subsystem is subjected to micro-adjustment through the pressure control valve, the first flow regulating valve, the second flow regulating valve, the carbon dioxide storage subsystem and the air bleeding subsystem, so that the optimization of the flow dividing coefficient is realized.
As a still further scheme of the invention: the system comprises a gas discharge subsystem and a control subsystem, wherein the gas discharge subsystem comprises a preheating transition tank, an inlet of the preheating transition tank is connected with a gas discharge side of a gas discharge pipeline, the preheating transition tank is provided with two gas discharge pipelines, namely a vacuum pumping pipeline and a gas discharge pipeline, the gas discharge pipeline is communicated with the atmosphere through a ninth shut-off valve, the vacuum pumping pipeline is sequentially provided with a vacuum pump and a chromatograph for measuring the purity of carbon dioxide in the recompression circulation subsystem, an eighth shut-off valve is arranged on the vacuum pumping pipeline between the preheating transition tank and the vacuum pump, and the vacuum pumping pipeline between the vacuum pump and the chromatograph is communicated with the atmosphere through a seventh shut-off valve; and the gas outlet sides of the ninth shut-off valve and the seventh shut-off valve are directly communicated to the atmosphere through flow meters.
As a still further scheme of the invention: the automatic control subsystem comprises an industrial personal computer, a sensor, a flow regulating valve, a pressure control valve and a valve controller of a shutoff valve in the whole system; the industrial personal computer is respectively connected to the low-temperature reciprocating pump, the preheater, the precooler, the main compressor, the recompressor, the heater, the turbine, the temperature regulator, the vacuum pump, each valve and the sensor through signal wires; the industrial personal computer controls the opening and closing of a shutoff valve, the adjustment of a pressure control valve and a flow regulating valve, the input power of a preheater and a heater, the heat exchange power of a precooler, a low-temperature reciprocating pump, a main compressor, a secondary compressor and a vacuum pump in the whole flow dividing regulation and control system through feedback signals of a flow meter, a temperature sensor and a pressure sensor in the whole circulating system;
the sensors comprise flow meters, temperature sensors and pressure sensors which are arranged in the carbon dioxide storage subsystem, the recompression circulation subsystem and the air bleeding subsystem;
the shutoff valve comprises a shutoff valve in the carbon dioxide storage subsystem, a shutoff valve in the recompression circulation subsystem and a shutoff valve in the air bleeding subsystem;
the flow regulating valve comprises a first flow regulating valve and a second flow regulating valve which are arranged in the recompression circulation subsystem.
As a still further scheme of the invention: the operation flow of the system is as follows:
s1, gas replacement Process
Opening a shut-off valve in the recompression circulation subsystem, opening a shut-off valve on a vacuumizing pipeline of an air bleeding subsystem, keeping the shut-off valve in the carbon dioxide storage subsystem and the shut-off valve on an air bleeding pipeline of the air bleeding subsystem in a closed state, and vacuumizing the recompression circulation subsystem through a vacuum pump; when the set vacuum degree in the recompression circulation subsystem is reached, closing a shut-off valve and a vacuum pump on a vacuum pumping pipeline of a gas discharge subsystem, opening a second shut-off valve on a gas phase pipeline of a carbon dioxide storage subsystem, and starting to charge carbon dioxide into the recompression circulation subsystem; when the gauge pressure in the recompression circulation subsystem reaches a first pressure value, closing a second shutoff valve of the carbon dioxide storage subsystem, and stopping filling carbon dioxide; then opening a ninth shut-off valve on an air discharge line of the air discharge subsystem for air discharge, and closing the ninth shut-off valve and opening the vacuum pump again for vacuum pumping when the pressure of the recompression circulation subsystem is reduced to the atmospheric pressure;
repeating the air pumping and inflating processes until the carbon dioxide concentration reaches the requirement, keeping the pressure in the recompression circulation subsystem at a second pressure value after the carbon dioxide concentration reaches the requirement, wherein the second pressure value is greater than the first pressure value, closing a vacuum pump and a shutoff valve in the air bleeding subsystem, and stopping the replacement process;
s2, filling process
Opening a first shut-off valve on a liquid phase pipeline in the carbon dioxide storage subsystem, keeping a second shut-off valve in the carbon dioxide storage subsystem in a closed state, outputting liquid phase carbon dioxide from a liquid phase outlet of the low-temperature storage tank, starting a low-temperature reciprocating pump and a preheater to pressurize and heat the output liquid phase carbon dioxide to reach a set pressure value and a set temperature value, and entering a recompression circulation subsystem through a filling buffer tank;
and after the flow meter on the liquid phase pipeline of the carbon dioxide storage subsystem determines that the whole system reaches the required carbon dioxide filling amount, closing the first shut-off valve and stopping injecting the carbon dioxide into the filling buffer tank.
As a still further scheme of the invention: the shunting regulation and control process of the system is as follows:
starting a precooler, a main compressor, a recompressor, a heater, a turbine and a temperature regulator, and operating the whole system according to a set circulation working condition; adjusting the working condition of the whole recompression circulation subsystem according to the measured values of a flowmeter, a pressure sensor and a temperature sensor in a circulation pipeline, and adjusting the pressure, the flow and the flow dividing coefficient through a pressure control valve and a flow control valve to enable the recompression circulation subsystem to tend to be in a stable state;
when the operation condition of the recompression circulation subsystem is close to the expected condition, the industrial personal computer judges whether the air supplement or the air release is needed to be carried out on the circulation system according to the measurement parameters of the whole circulation system; when gas is required to be supplemented, supplementing gas to the recompression circulation subsystem through the carbon dioxide storage subsystem according to the set gas supplementing pressure and temperature; when the air needs to be discharged, the air is discharged through the air discharging subsystem according to the required air discharging amount; and continuously adjusting the operating condition parameters of the recompression circulation subsystem through the automatic control subsystem to finally reach the set circulation condition.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the carbon dioxide is provided for the recompression circulation subsystem through the carbon dioxide storage subsystem, the carbon dioxide in the recompression circulation subsystem is vacuumized or discharged through the gas discharge subsystem, when the automatic control subsystem automatically realizes the charging or gas supplementing of the carbon dioxide and the vacuumizing or gas discharge of the gas discharge subsystem, the working condition of the recompression circulation subsystem is pre-adjusted according to the measurement values of the flow meter, the pressure sensor and the temperature sensor, and the pressure flow and the flow dividing coefficient are adjusted through adjusting the pressure control valve and the flow control valve, so that the whole system is in a stable state, and the problem of pinch points is prevented.
2. The filling buffer tank is arranged, so that the carbon dioxide filling buffer tank plays a role in buffering during carbon dioxide filling; the carbon dioxide storage subsystem pre-pressurizes the circulating system through the gas-phase pipeline and pre-heats and pressurizes carbon dioxide in the liquid-phase pipeline through the low-temperature reciprocating pump and the pre-heater respectively so as to avoid dry ice blockage of the circulating subsystem.
3. The flow regulating valve and the flow meter are arranged on the confluence section pipeline and one section of the shunt pipeline, so that the flow condition in the whole system can be dynamically observed and regulated in real time; the inlet and the outlet of the temperature regulator are connected with the bypass pipeline in parallel, and after the temperature is stable, the shut-off valve at the inlet and the outlet of the temperature regulator is opened, so that gas passes through the bypass pipeline, and the flow resistance is reduced.
4. The automatic control subsystem sequentially realizes the gas replacement, gas filling and flow distribution regulation and control processes, so that the whole system reaches the set circulation condition; before the circulation pipeline is shunted, the pressure and the temperature are controlled, and simultaneously, the carbon dioxide storage subsystem and the air bleeding subsystem are combined to adjust the shunting coefficient so that the circulation system can stably run; after the recompression circulation subsystem is filled with carbon dioxide, the operation condition of the recompression circulation subsystem is pre-adjusted through a precooler, a main compressor, a recompressor, a heater and a temperature regulator; and after the stable working condition is reached, performing micro-adjustment on the recompression circulation subsystem by using a pressure control valve, a flow regulating valve, a carbon dioxide storage subsystem and a gas discharge subsystem, and finally realizing the optimization of the flow dividing coefficient and the stable operation working condition.
5. According to the invention, through effective cooperation of the carbon dioxide storage subsystem, the recompression circulation subsystem, the air discharge subsystem and the automatic control subsystem, the influence of key parameters such as the inlet and outlet pressure of the main compressor, the flow distribution coefficient, the turbine inlet temperature and the like on the circulation efficiency is dynamically analyzed in the process of adjusting the operation condition of the circulation system, and the optimal coupling relation among the key parameters is obtained, so that the circulation efficiency of the system is the highest, and the improvement of the energy utilization rate and the energy conservation are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a low-temperature storage tank; 2. a cryogenic reciprocating pump; 3. a preheater; 4. filling a buffer tank; 5. a main compressor; 6. a precooler; 7. then compressing the mixture; 8. a turbine; 9. a heater; 10. a high temperature regenerator; 11. a low temperature regenerator; 12. a thermostat; 13. a chromatograph; 14. a vacuum pump; 15. preheating a transition tank; 16. an industrial personal computer;
XV1, first shut-off valve; XV2, second shut-off valve; XV3, third shut-off valve; XV4, fourth shutoff valve; XV5, fifth shutoff valve; XV6, sixth shut-off valve; XV7, seventh shut-off valve; XV8, eighth shut-off valve; XV9, ninth shut-off valve;
FV1, first flow rate regulating valve; FV2, second flow regulating valve; CV1, a pressure control valve; F. a flow meter; t, a temperature sensor; p, a pressure sensor.
Note: other ancillary valves and instrumentation are not embodied in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, in an embodiment of the present invention, a flow splitting regulation system for a supercritical carbon dioxide recompression cycle is composed of several subsystems, and each subsystem is described in detail below.
1. Carbon dioxide storage subsystem
The carbon dioxide storage subsystem is used for storing carbon dioxide and providing a carbon dioxide source for the recompression circulation subsystem, and preheating and pressurizing the carbon dioxide during charging or air supplement.
The carbon dioxide storage subsystem comprises a low-temperature storage tank 1 for storing carbon dioxide, a liquid phase outlet and a gas phase outlet of the low-temperature storage tank 1 are respectively connected with a liquid phase inlet and a gas phase inlet of a filling buffer tank 4 in the recompression circulation subsystem through a liquid phase pipeline and a gas phase pipeline, a low-temperature reciprocating pump 2 and a preheater 3 are sequentially arranged in the liquid phase pipeline along the flow direction of the carbon dioxide, and the low-temperature reciprocating pump 2 and the preheater 3 are used for preheating and pressurizing the carbon dioxide in the liquid phase pipeline so as to avoid the circulation subsystem from being blocked by dry ice; the liquid phase pipeline is provided with a first shut-off valve XV1, the gas phase pipeline is provided with a second shut-off valve XV2, the input selection of liquid phase and gas phase carbon dioxide can be realized by controlling the opening and closing of the two shut-off valves, the specific positions of the two shut-off valves are not limited, and the second shut-off valve XV2 is preferably arranged at the liquid phase inlet close to the filling buffer tank 4. A flowmeter F, a pressure sensor P and a temperature sensor T are additionally arranged in the system, the flowmeter is used for measuring the flow of carbon dioxide, the carbon dioxide filling amount required by the whole system can be conveniently determined subsequently, and the automatic control subsystem controls the carbon dioxide output pressure and temperature of the carbon dioxide storage subsystem through the low-temperature reciprocating pump 2, the preheater 3, the pressure sensor P and the temperature sensor T.
2. Recompression cycling subsystem
The recompression circulation subsystem is including filling buffer tank 4, and the filling buffer tank plays the transition effect in the filling process of carbon dioxide, has reduced the pressure fluctuation of recompression circulation subsystem, has guaranteed the steady of system, and instruments such as level gauge, manometer and temperature sensor are installed to its tank body. The circulating end outlet and the circulating end inlet of the charging buffer tank 4 are connected through a circulating pipeline, the circulating pipeline is divided into two pipelines firstly and then converged into one pipeline, a precooler 6 for reducing the temperature of carbon dioxide before entering a compressor to be close to the operating condition, a main compressor 5 for pressurizing the carbon dioxide and a low-temperature regenerator 11 for preheating and heating the carbon dioxide by using waste heat of exhaust gas after the work of a turbine are sequentially arranged on one section of pipeline after the division along the gas flow direction, a recompressor 7 for similarly pressurizing the carbon dioxide is arranged on the other section of pipeline after the division, and a high-temperature regenerator 10 for preheating and heating the carbon dioxide by using waste heat of the exhaust gas after the work of the turbine, a heater 9 for further increasing the temperature of the carbon dioxide and a turbine 8 for reducing the pressure and the temperature of the high-temperature high-pressure carbon dioxide and converting the energy into the mechanical work are arranged on the circulating pipeline after the convergence along the gas flow direction; after passing through the turbine 8, the gas in the circulating pipeline passes through the high-temperature heat regenerator 10 and the low-temperature heat regenerator 11 in sequence, finally enters the temperature regulator 12, and the carbon dioxide entering the temperature regulator 12 is introduced into the charging buffer tank 4 after the temperature is regulated, so that the whole cycle is completed.
The main compressor 5 and the recompressor 7 are coaxial with the turbine and are connected with an alternating-current generator; the turbine 8 converts thermal energy to mechanical energy during operation, and the turbine 8 is connected to an alternator to convert the mechanical energy back to electrical energy to power the main compressor 5 and the recompressor 7.
At least one second flow regulating valve FV2 and a flow meter F are required to be arranged at one section of the two sections of flow dividing pipelines, preferably between the precooler 6 and the flow dividing point, and a part of carbon dioxide after being divided is connected to the inlet of the recompressor through the flow meter, the flow regulating valve FV2 and the pressure and temperature sensors in sequence; the circulation line also requires at least one first flow-regulating valve FV1 and a flow meter in the collector line, preferably between the thermostat 12 and the filling buffer tank 4;
a high-pressure inlet and a low-pressure inlet are arranged on the low-temperature heat regenerator 11 and the high-temperature heat regenerator 10 respectively, an outlet of the main compressor 5 is connected with a high-pressure side inlet of the low-temperature heat regenerator 11, and a high-pressure side outlet of the low-temperature heat regenerator 11 is connected with a high-pressure side inlet of the high-temperature heat regenerator 10 after passing through a confluence point; the outlet of the recompressor 7 is connected with the high-pressure side inlet of the high-temperature heat regenerator 10, and the high-pressure side outlet of the high-temperature heat regenerator is connected with the inlet of the heater 9; the outlet of the turbine 8 is connected with the low-pressure side inlet of the high-temperature regenerator 10, the low-pressure side outlet of the high-temperature regenerator 10 is connected with the low-pressure side inlet of the low-temperature regenerator 11, and the low-pressure side outlet of the low-temperature regenerator 11 is connected with the inlet of the temperature regulator 12.
In order to reduce flow resistance in the circulation process, a bypass pipeline is connected in parallel at an inlet and an outlet of the temperature regulator 12, a fifth shut-off valve XV5 and a sixth shut-off valve XV6 are arranged in the bypass pipeline, and a third shut-off valve XV3 and a fourth shut-off valve XV4 are respectively arranged at the inlet and the outlet of the temperature regulator 12; inlets of a fourth shut-off valve XV4 and a sixth shut-off valve XV6 are connected with a low-pressure side outlet of the low-temperature regenerator 11, an outlet of the fourth shut-off valve XV4 is connected with an inlet of a thermostat 12, an outlet of the sixth shut-off valve XV6 is connected with an inlet of a fifth shut-off valve XV5, an inlet of a third shut-off valve XV3 is connected with an outlet of the thermostat 12, and outlets of the third shut-off valve XV3 and the fifth shut-off valve XV5 are connected to inlets of a circulating end of a charging buffer tank 4; after the temperature of the whole circulation system is stabilized by the thermostat 12, the third and fourth shut-off valves XV3 and XV4 are closed to allow the carbon dioxide to pass through the bypass pipeline, so as to reduce the flow resistance. The two shut-off valves of the fifth shut-off valve XV5 and the sixth shut-off valve XV6 are arranged in the bypass pipeline because the pipeline is too long, and only one shut-off valve is adopted under the condition that the pipeline is shortened.
The inlet side of the precooler 6, the inlet side of the main compressor 5, the inlet side of the recompressor 7, the inlet and outlet sides of the circulating end of the charging buffer tank 4, the inlet and outlet sides of the low-temperature heat regenerator 11, the inlet and outlet sides of the high-temperature heat regenerator 10, the inlet and outlet sides of the heater 9 and the inlet and outlet sides of the turbine 8 are all provided with pressure sensors and temperature sensors; a pressure control valve CV1 is arranged at the outlet of the turbine 8; the working condition of the recompression circulation subsystem is adjusted through the measurement values of the pressure sensor P, the temperature sensor T and the flow meter F so as to realize the relative stability of the recompression circulation subsystem, and then the recompression circulation subsystem is subjected to micro-adjustment through the pressure control valve CV1, the first flow regulating valve FV1, the second flow regulating valve FV2, the carbon dioxide storage subsystem and the air bleeding subsystem so as to realize the optimization of the shunt coefficient; the pressure sensor P, the temperature sensor T and the flow meter F are used here to measure pressure, temperature and flow parameters on the circulation loop line, and the flow regulating valve is used to make fine adjustments to the circulation flow.
The circulating pipeline is integrally divided into a low-pressure low-temperature section, a low-pressure high-temperature section, a high-pressure low-temperature section and a high-pressure high-temperature section; the low-pressure side outlet of the low-temperature heat regenerator 11 to the inlet of the main compressor 5 and the inlet of the recompressor 7 are low-pressure low-temperature sections; the outlet of the main compressor 5 to the inlet of the high-pressure side of the low-temperature heat regenerator 11, the outlet of the recompressor 7 to the inlet of the high-pressure side of the high-temperature heat regenerator 10 are high-pressure low-temperature sections; the high-pressure side outlet of the high-temperature heat regenerator 10 to the inlet of the turbine 8 is a high-pressure high-temperature section; the outlet of the turbine 8 and the inlet of the low-pressure side of the low-temperature regenerator 11 are low-pressure high-temperature sections.
And the low-pressure low-temperature section, the high-pressure high-temperature section and the low-pressure high-temperature section are all provided with exhaust pipelines connected with the air bleeding subsystem.
The operation condition of the low-temperature and low-pressure end is (7-8MPa, 30-200 ℃), the operation condition of the high-pressure and low-temperature section is (23-24MPa, 30-200 ℃), the operation condition of the high-pressure and high-temperature section is (23-24MPa, 400-600 ℃), and the operation condition of the low-pressure and high-temperature section is (7-8MPa, 300-400 ℃).
3. Air bleed subsystem
And the air bleeding subsystem is connected with the circulating subsystem and used for vacuumizing the circulating subsystem when the circulating subsystem is filled with carbon dioxide or discharging more carbon dioxide in the circulating subsystem when the circulating subsystem is regulated to run.
The air bleeding subsystem comprises a preheating transition tank 15, an inlet of the preheating transition tank 15 is connected with an air outlet side of an air exhaust pipeline, two air outlet pipelines, namely a vacuumizing pipeline and an air bleeding pipeline, are arranged on the preheating transition tank 15, the air bleeding pipeline is communicated with the atmosphere through a ninth shut-off valve VX9, a vacuum pump 14 and a chromatograph 13 used for measuring the purity of carbon dioxide in the recompression circulation subsystem are sequentially arranged on the vacuumizing pipeline, an eighth shut-off valve XV8 is arranged on the vacuumizing pipeline between the preheating transition tank 15 and the vacuum pump 14, and the vacuumizing pipeline between the vacuum pump 14 and the chromatograph 13 is communicated with the atmosphere through a seventh shut-off valve XV 7; the gas outlet sides of the ninth shut-off valve XV9 and the seventh shut-off valve XV7 are both directly open to the atmosphere via a flow meter F.
The preheating transition tank 15 is used for preheating carbon dioxide before the carbon dioxide is discharged into the atmosphere, the vacuum pump 11 is used for carrying out the vacuumizing process on the recompression circulation subsystem, and the chromatograph 12 is used for carrying out concentration measurement on the carbon dioxide in the recompression circulation subsystem.
4. Automatic control subsystem
The automatic control subsystem comprises an industrial personal computer 16, a sensor, a flow regulating valve, a pressure control valve and a valve controller of a shutoff valve in the whole system; the industrial personal computer 16 is respectively connected to the low-temperature reciprocating pump 2, the preheater 3, the precooler 6, the main compressor 5, the recompressor 7, the heater 9, the turbine 8, the temperature regulator 12, the vacuum pump 14, various valves and sensors through signal lines; the industrial personal computer 16 controls the opening and closing of a shut-off valve, the adjustment of a pressure control valve and a flow regulating valve, the input power of the preheater 3 and the heater 9, the heat exchange power of the precooler 6, the operation of the low-temperature reciprocating pump 2, the main compressor 5, the recompressor 7 and the vacuum pump 14 in the whole flow dividing regulation and control system through feedback signals of a flow meter F, a temperature sensor T and a pressure sensor P in the whole circulating system;
the sensors comprise a flow meter F, a temperature sensor T and a pressure sensor P which are arranged in the carbon dioxide storage subsystem, the recompression circulation subsystem and the air bleeding subsystem;
the shutoff valve comprises a shutoff valve in the carbon dioxide storage subsystem, a shutoff valve in the recompression circulation subsystem and a shutoff valve in the air bleeding subsystem;
the flow regulating valve comprises a first flow regulating valve FV1 and a second flow regulating valve FV2 which are arranged in the recompression circulation subsystem.
The invention operates specifically as follows:
s1, gas replacement Process
Firstly, opening a third shut-off valve XV3, a fourth shut-off valve XV4, a fifth shut-off valve XV5, a sixth shut-off valve XV6, a seventh shut-off valve XV7 and an eighth shut-off valve XV8 in a recompression circulation subsystem, ensuring that other shut-off valves are in a closed state, and opening a vacuum pump 14 to vacuumize the recompression circulation subsystem; and when the recompression circulation subsystem reaches the set vacuum degree, closing a seventh shut-off valve XV7, an eighth shut-off valve XV8 and a vacuum pump in the air bleeding subsystem. Opening a second shut-off valve XV2 on a gas phase pipeline in the carbon dioxide storage subsystem, and starting to charge carbon dioxide into the recompression circulation subsystem; when the gauge pressure in the recompression circulation subsystem reaches a first pressure value (the pressure changes according to different set working conditions of the system, and the invention is preferably 0.2 Mpa), closing a second shut-off valve XV2 in the carbon dioxide storage subsystem, and stopping carbon dioxide charging; then opening a ninth shut-off valve XV9 on an air discharge line of the air discharge subsystem for air discharge, closing the ninth shut-off valve XV9 when the pressure in the recompression circulation subsystem is reduced to be the same as the atmospheric pressure, and opening a vacuum pump 14 for vacuum pumping;
repeating the air pumping and air charging processes for 2-5 times to meet the concentration requirement of the carbon dioxide, when the concentration of the carbon dioxide in the system meets the requirement, keeping the pressure in the recompression circulation subsystem at a second pressure value (the pressure is changed according to different set working conditions of the system, and the pressure is preferably 1 Mpa), and at the moment, closing the vacuum pump 14 and the shutoff valve in the air discharging subsystem to stop the replacement process of the carbon dioxide;
s2, filling process
Opening a first shut-off valve XV1 on a liquid phase pipeline in a carbon dioxide storage subsystem, keeping a second shut-off valve XV2 in a closed state, outputting liquid phase carbon dioxide from a liquid phase outlet of a low-temperature storage tank 1, starting a low-temperature reciprocating pump 2 and a preheater 3 to pressurize and heat the output liquid phase carbon dioxide when outputting the carbon dioxide to reach a set pressure value and temperature value, and enabling the carbon dioxide to enter a recompression circulation subsystem after passing through a filling buffer tank 4.
After the flow meter F on the liquid phase pipeline of the carbon dioxide storage subsystem determines that the whole system reaches the required carbon dioxide filling amount, the first shut-off valve XV1 is closed, and the carbon dioxide is stopped from being injected into the filling buffer tank 4.
S3, shunting regulation and control process
Starting a precooler 6, a main compressor 5, a recompressor 7, a heater 9, a turbine 8 and a temperature regulator 12, and operating the whole system according to a set cycle working condition; according to the measured values of a flow meter F, a pressure sensor P and a temperature sensor T in a circulation pipeline, the working condition of the whole recompression circulation subsystem is adjusted, and then the pressure, the flow and the shunt coefficient are adjusted through a pressure control valve CV1 and flow control valves (FV 1 and FV 2), so that the recompression circulation subsystem tends to be in a stable state;
when the operation condition of the recompression circulation subsystem is close to the expected condition, the industrial personal computer 16 judges whether the air supplement or the air release is needed to be carried out on the circulation system according to the measurement parameters of the whole circulation system; when gas is required to be supplemented, supplementing gas to the recompression circulation subsystem through the carbon dioxide storage subsystem according to the set gas supplementing pressure and temperature; when the air needs to be discharged, the air is discharged through the air discharging subsystem according to the required air discharging amount; and continuously adjusting the operating condition parameters of the recompression circulation subsystem through the automatic control subsystem to finally reach the set circulation condition.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. A split-flow regulation system for use in a supercritical carbon dioxide recompression cycle, the system comprising:
the carbon dioxide storage subsystem is used for storing carbon dioxide, providing a carbon dioxide source for the recompression circulation subsystem and preheating and pressurizing the carbon dioxide during filling or air supplement;
the recompression circulation subsystem is respectively connected with the carbon dioxide storage subsystem and the deflation subsystem, receives the filling of the carbon dioxide from the carbon dioxide storage subsystem, controls the air supplement of the carbon dioxide storage subsystem, controls the deflation of the deflation subsystem and regulates and controls the flow dividing coefficient in the recompression circulation subsystem through the automatic control subsystem so as to realize the stable and continuous circulation operation of the recompression circulation subsystem;
the gas discharge subsystem is connected with the recompression circulation subsystem and is used for vacuumizing the recompression circulation subsystem when the recompression circulation subsystem is filled with carbon dioxide or discharging more carbon dioxide in the recompression circulation subsystem when the recompression circulation subsystem is adjusted to run;
the automatic control subsystem is used for automatically controlling the carbon dioxide storage subsystem, the recompression circulation subsystem and the deflation subsystem, automatically realizing the filling or air supplement of the carbon dioxide, the vacuumizing and deflation of the deflation subsystem, and regulating and controlling the flow dividing coefficient in the recompression circulation subsystem to enable the carbon dioxide to stably run;
the recompression circulation subsystem comprises a filling buffer tank (4), the outlet end and the inlet end of the filling buffer tank (4) are connected through a circulation pipeline, the circulation pipeline is divided and converged, a precooler (6), a main compressor (5) and a low-temperature heat regenerator (11) are sequentially arranged on one divided section of pipeline along the gas flow direction, and a recompressor (7) is arranged on the other divided section of pipeline; a high-temperature regenerator (10), a heater (9) and a turbine (8) are sequentially arranged on the converged circulating pipeline along the gas flow direction; after passing through a turbine (8), gas in the circulating pipeline passes through a high-temperature heat regenerator (10) and a low-temperature heat regenerator (11) in sequence, and finally enters a temperature regulator (12); the circulating pipeline is provided with at least one second flow regulating valve (FV 2) and a flow meter (F) in one section of the branch line, and the circulating pipeline is provided with at least one first flow regulating valve (FV 1) and a flow meter (F) in the confluence section of the branch line;
at least one shut-off valve is arranged in the recompression circulation subsystem; a pressure sensor (P) and a temperature sensor (T) are arranged in the circulating pipeline; the automatic control subsystem adjusts the working condition of the recompression circulation subsystem through the measurement values of the pressure sensor (P), the temperature sensor (T) and the flowmeter (F); the circulating pipeline is connected with the air bleeding subsystem through an exhaust pipeline, and a shut-off valve is arranged in the exhaust pipeline and/or the air bleeding subsystem.
2. The split flow conditioning system for a supercritical carbon dioxide recompression cycle as claimed in claim 1, wherein the carbon dioxide storage subsystem: the carbon dioxide storage subsystem comprises a low-temperature storage tank (1), a low-temperature reciprocating pump (2) and a preheater (3) which are sequentially connected in series along the liquid flow direction; a gas phase pipeline outlet of the low-temperature storage tank (1) is connected with a gas phase inlet of a filling buffer tank (4) in the recompression circulation subsystem, and a liquid phase pipeline outlet of the low-temperature storage tank (1) is connected with a liquid phase inlet of the filling buffer tank (4) in the recompression circulation subsystem through a low-temperature reciprocating pump (2) and a preheater (3) in sequence; the gas phase pipeline is provided with a first shut-off valve (XV 1), the liquid phase pipeline is provided with a second shut-off valve (XV 2), the second shut-off valve (XV 2) is arranged to be close to a liquid phase inlet of the filling buffer tank (4), and an outlet pipeline between the preheater (3) and the second shut-off valve (XV 2) is further provided with a flow meter (F).
3. The split-flow regulation system for supercritical carbon dioxide recompression cycle as claimed in claim 2, wherein the automatic control subsystem regulates the operation of the cryogenic reciprocating pump (2), the preheater (3) and controls the carbon dioxide output pressure and temperature of the carbon dioxide storage subsystem through the measurements of the pressure sensor (P), the temperature sensor (T) and the flow meter (F) in the carbon dioxide storage subsystem.
4. The flow dividing regulation and control system for the supercritical carbon dioxide recompression cycle as claimed in claim 1, wherein a bypass pipeline is connected in parallel at the inlet and outlet of the thermostat (12), a fifth shut-off valve (XV 5) and a sixth shut-off valve (XV 6) are arranged in the bypass pipeline, and a third shut-off valve (XV 3) and a fourth shut-off valve (XV 4) are respectively arranged at the inlet and outlet of the thermostat (12); inlets of a fourth shut-off valve (XV 4) and a sixth shut-off valve (XV 6) are connected with a low-pressure side outlet of the low-temperature regenerator (11), an outlet of the fourth shut-off valve (XV 4) is connected with an inlet of a thermostat (12), an outlet of the sixth shut-off valve (XV 6) is connected with an inlet of a fifth shut-off valve (XV 5), an inlet of the third shut-off valve (XV 3) is connected with an outlet of the thermostat (12), and outlets of the third shut-off valve (XV 3) and the fifth shut-off valve (XV 5) are connected with a circulating end inlet of the charging buffer tank (4);
the inlet side of the precooler (6), the inlet side of the main compressor (5), the inlet side of the recompressor (7), the inlet and outlet sides of the circulating end of the charging buffer tank (4), the inlet and outlet sides of the low-temperature heat regenerator (11), the inlet and outlet sides of the high-temperature heat regenerator (10), the inlet and outlet sides of the heater (9) and the inlet and outlet sides of the turbine (8) are respectively provided with a pressure sensor and a temperature sensor; a pressure control valve (CV 1) is arranged at the outlet of the turbine (8); the first flow regulating valve (FV 1) is located at the inlet of the circulation end of the filling buffer tank (4), and the second flow regulating valve (FV 2) is located at the inlet of the precooler (6).
5. The flow-splitting regulation and control system for the supercritical carbon dioxide recompression cycle as claimed in claim 4, wherein the automatic control subsystem regulates the precooler (6), the main compressor (5), the recompressor (7), the heater (9) and the temperature regulator (12) according to the measured values of the pressure sensor (P), the temperature sensor (T) and the flow meter (F) arranged on the circulation pipeline, so that the operation condition of the recompression cycle subsystem reaches a relatively stable state, and then the recompression cycle subsystem is finely regulated through the pressure control valve (CV 1), the first flow regulating valve (FV 1), the second flow regulating valve (FV 2), the carbon dioxide storage subsystem and the air bleeding subsystem, so as to optimize the flow-splitting coefficient.
6. The flow dividing and regulating system for the recompression cycle of supercritical carbon dioxide as claimed in claim 1, wherein the air bleeding subsystem comprises a preheating transition tank (15), the inlet of the preheating transition tank (15) is connected to the air outlet side of the air exhaust line, the preheating transition tank (15) is provided with two air outlet lines, namely a vacuum pumping line and an air bleeding line, the air bleeding line is opened to the atmosphere through a ninth shut-off valve (XV 9), the vacuum pumping line is provided with a vacuum pump (14) and a chromatograph (13) for measuring the purity of carbon dioxide in the recompression cycle subsystem in sequence, the vacuum pumping line between the preheating transition tank (15) and the vacuum pump (14) is provided with an eighth shut-off valve (XV 8), and the vacuum pumping line between the vacuum pump (14) and the chromatograph (13) is opened to the atmosphere through a seventh shut-off valve (XV 7); the gas outlet sides of the ninth shut-off valve (XV 9) and the seventh shut-off valve (XV 7) are directly communicated to the atmosphere through a flow meter (F).
7. The split flow regulation system for supercritical carbon dioxide recompression cycle as claimed in claim 1, wherein the automatic control subsystem comprises an industrial control computer (16), sensors, flow regulating valves, pressure control valves and valve controllers of shut-off valves in the whole system; the industrial personal computer (16) is respectively connected to the low-temperature reciprocating pump (2), the preheater (3), the precooler (6), the main compressor (5), the recompressor (7), the heater (9), the turbine (8), the temperature regulator (12), the vacuum pump (14), various valves and sensors through signal lines; the industrial personal computer (16) controls the opening and closing of a shutoff valve, the regulation of a pressure control valve and a flow regulating valve, the input power of a preheater (3) and a heater (9), the heat exchange power of a precooler (6), the operation of a low-temperature reciprocating pump (2), a main compressor (5), a recompressor (7) and a vacuum pump (14) in the whole flow dividing regulation and control system through feedback signals of a flow meter (F), a temperature sensor (T) and a pressure sensor (P) in the whole circulating system;
the sensors comprise a flow meter (F), a temperature sensor (T) and a pressure sensor (P) which are arranged in the carbon dioxide storage subsystem, the recompression circulation subsystem and the air bleeding subsystem;
the shutoff valve comprises a shutoff valve in the carbon dioxide storage subsystem, a shutoff valve in the recompression circulation subsystem and a shutoff valve in the air bleeding subsystem;
the flow regulating valve comprises a first flow regulating valve (FV 1) and a second flow regulating valve (FV 2) which are arranged in the recompression circulation subsystem.
8. A split-flow regulation system for a supercritical carbon dioxide recompression cycle as claimed in claim 2 or 3 wherein the system is operated as follows:
s1, gas replacement Process
Opening a shut-off valve in the recompression circulation subsystem, opening a shut-off valve on a vacuumizing pipeline of an air bleeding subsystem, keeping the shut-off valve in the carbon dioxide storage subsystem and the shut-off valve on an air bleeding pipeline of the air bleeding subsystem in a closed state, and vacuumizing the recompression circulation subsystem through a vacuum pump (14); when the set vacuum degree in the recompression circulation subsystem is reached, closing a shut-off valve and a vacuum pump (14) on a vacuum pumping pipeline of the air bleeding subsystem, opening a second shut-off valve (XV 2) on a gas phase pipeline of the carbon dioxide storage subsystem, and beginning to charge carbon dioxide into the recompression circulation subsystem; when the gauge pressure in the recompression circulation subsystem reaches a first pressure value, closing a second shut-off valve (XV 2) of the carbon dioxide storage subsystem, and stopping filling carbon dioxide; then opening a ninth shut-off valve (XV 9) on an air discharge line of the air discharge subsystem for air discharge, closing the ninth shut-off valve (XV 9) and opening the vacuum pump (14) again for vacuum pumping when the pressure of the recompression circulation subsystem is reduced to the atmospheric pressure;
repeating the air pumping and inflating processes until the carbon dioxide concentration reaches the requirement, keeping the pressure in the recompression circulation subsystem at a second pressure value after the carbon dioxide concentration reaches the requirement, wherein the second pressure value is greater than the first pressure value, closing a vacuum pump (14) and a shut-off valve in the air bleeding subsystem, and stopping the replacement process;
s2, filling process
Opening a first shut-off valve (XV 1) on a liquid phase pipeline in the carbon dioxide storage subsystem, keeping a second shut-off valve (XV 2) in the carbon dioxide storage subsystem in a closed state, outputting liquid phase carbon dioxide from a liquid phase outlet of the low-temperature storage tank (1), starting a low-temperature reciprocating pump (2) and a preheater (3) to pressurize and heat the output liquid phase carbon dioxide to reach a set pressure value and temperature value, and entering a recompression circulation subsystem through a filling buffer tank (4);
after the flow meter (F) on the liquid phase pipeline of the carbon dioxide storage subsystem determines that the whole system reaches the required carbon dioxide filling amount, the first shut-off valve (XV 1) is closed, and the carbon dioxide is stopped from being injected into the filling buffer tank (4).
9. The system of claim 8, wherein the system is operated by the following process:
starting a precooler (6), a main compressor (5), a recompressor (7), a heater (9), a turbine (8) and a temperature regulator (12), and operating the whole system according to a set cycle working condition; the working condition of the whole recompression circulation subsystem is adjusted according to the measured values of a flow meter (F), a pressure sensor (P) and a temperature sensor (T) in a circulation pipeline, and the pressure, the flow and the shunt coefficient are adjusted through a pressure control valve (CV 1) and a flow control valve, so that the recompression circulation subsystem tends to be in a stable state;
when the operation condition of the recompression circulation subsystem is close to the expected condition, the industrial personal computer (16) judges whether the air supplement or the air release is needed to be carried out on the circulation system according to the measurement parameters of the whole circulation system; when gas is required to be supplemented, supplementing gas to the recompression circulation subsystem through the carbon dioxide storage subsystem according to the set gas supplementing pressure and temperature; when the air needs to be discharged, the air is discharged through the air discharging subsystem according to the required air discharging amount; and continuously adjusting the operating condition parameters of the recompression circulation subsystem through the automatic control subsystem to finally reach the set circulation condition.
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