CN115492658A - Supercritical carbon dioxide power generation method, device, storage medium and system - Google Patents
Supercritical carbon dioxide power generation method, device, storage medium and system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention discloses a supercritical carbon dioxide power generation method, a supercritical carbon dioxide power generation device, a supercritical carbon dioxide storage medium and a supercritical carbon dioxide power generation system, wherein the actual conditions such as a power generation working mode, a power generation scene change condition and the like are determined through an operation parameter group of a power generation and energy storage integrated system, so that power generation is carried out in a corresponding mode according to the power generation working mode and the power generation scene change condition in an adaptive manner; furthermore, the supercritical carbon dioxide power generation method, the supercritical carbon dioxide power generation device, the supercritical carbon dioxide power generation storage medium and the supercritical carbon dioxide power generation system further improve the economy and the utilization efficiency of stored energy by storing pressure energy of high-pressure supercritical carbon dioxide and storing the excess heat energy of the system in a classified manner.
Description
Technical Field
The invention relates to the technical field of supercritical carbon dioxide power generation, in particular to a supercritical carbon dioxide power generation method, a supercritical carbon dioxide power generation device, a computer readable storage medium and a supercritical carbon dioxide power generation system.
Background
A supercritical carbon dioxide power generation system is a Brayton power generation circulation system taking supercritical carbon dioxide as a heat energy circulation working medium, has the remarkable advantages of high thermoelectric conversion efficiency, small volume of power equipment and the system, simple and compact structure, good flexibility and the like, only the temperature of 500-800 ℃ needs to be provided from the outside, the power generation efficiency of the supercritical carbon dioxide Brayton circulation power generation system under the same temperature level is higher than that of a traditional steam Rankine cycle power generation system by more than 5 percent, and as a leading-edge power generation technology, the supercritical carbon dioxide power generation system has wide engineering application prospect in the field of traditional thermal power generation, nuclear power generation, solar photo-thermal power, dry-hot rock and other thermal energy power generation.
However, the prior art still has the following defects: when the device is used in the field of various heat energy power generation, redundant heat energy of a system cannot be efficiently and economically stored, the coupling degree of power generation and energy storage is not high, and when the load or heat of a heat source changes, the flow of a working medium entering a power generation system cannot be flexibly adjusted, the flexible adjustment of external power output cannot be realized, the actual power generation requirement cannot be matched, and the problem of low power generation flexibility exists.
Accordingly, there is a need for a supercritical carbon dioxide power generation method, apparatus, computer readable storage medium, and system that overcomes the above-mentioned deficiencies in the prior art.
Disclosure of Invention
The embodiment of the invention provides a supercritical carbon dioxide power generation method, a supercritical carbon dioxide power generation device, a computer readable storage medium and a supercritical carbon dioxide power generation system, so that the flexible adaptability of power storage and power generation and actual requirements is improved.
An embodiment of the present invention provides a supercritical carbon dioxide power generation method, including: acquiring a running parameter group of the power generation and energy storage integrated system, and determining a power generation working mode and a power generation scene change condition according to the running parameter group; the power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions are load reduction and load increase; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module; when the power generation working mode is an energy storage power generation mode, the energy storage module drives the main power generation module to generate power; when the power generation working mode is a working medium power generation mode and the power generation scene change condition is that the load is reduced, reducing the flow of a first working medium flowing into the main power generation module according to a preset first working medium flow regulation method, and performing working medium power generation and energy storage through supercritical carbon dioxide according to the flow of the first working medium; when the power generation working mode is a working medium power generation mode and the power generation scene change condition is load increase, the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module are adjusted according to a preset second working medium flow adjusting method, and working medium power generation and energy storage are carried out through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
As an improvement of the above aspect, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change situation is peak power utilization, the main power generation module is operated in a full load mode to generate power, the fourth working medium flow flowing into the auxiliary power generation module is increased, and working medium power generation is carried out through supercritical carbon dioxide according to the fourth working medium flow.
As an improvement of the above aspect, the power generation method further includes: and when the power generation working mode is a working medium power generation mode and the power generation scene change condition is excessive heat supply, increasing the flow of a fifth working medium flowing into the energy storage module to store energy.
As an improvement of the above aspect, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is insufficient heat supply, the supercritical carbon dioxide is subjected to supplementary heating through the high-temperature heat storage device in the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
As an improvement of the above, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is a heat supply fault, the energy is released through the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
As an improvement of the above solution, the energy storage module is used for storing thermal energy and pressure energy separately.
As an improvement of the above scheme, the energy storage module is further configured to store the thermal energy in a classified manner according to the temperature of the thermal energy.
The invention correspondingly provides a supercritical carbon dioxide power generation device, which comprises a mode determining unit, an energy storage power generation unit and a working medium power generation unit, wherein the mode determining unit is used for acquiring a running parameter group of a power generation and energy storage integrated system and determining a power generation working mode and a power generation scene change condition according to the running parameter group; the power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions are load reduction and load increase; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module; the energy storage power generation unit is used for driving the main power generation module to generate power through the energy storage module when the power generation working mode is an energy storage power generation mode; the working medium power generation unit is used for reducing the first working medium flow flowing into the main power generation module according to a preset first working medium flow regulation method when the power generation working mode is a working medium power generation mode and the power generation scene change condition is that the load is reduced, and carrying out working medium power generation and energy storage through supercritical carbon dioxide according to the first working medium flow; when the power generation working mode is a working medium power generation mode and the power generation scene change condition is load increase, the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module are adjusted according to a preset second working medium flow adjusting method, and working medium power generation and energy storage are carried out through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
As an improvement of the above scheme, the working medium power generation unit is further used for: when the power generation working mode is a working medium power generation mode and the power generation scene change situation is peak power utilization, the main power generation module is operated in a full load mode to generate power, the fourth working medium flow flowing into the auxiliary power generation module is increased, and working medium power generation is performed through supercritical carbon dioxide according to the fourth working medium flow.
As an improvement of the above scheme, the working medium power generation unit is further configured to: and when the power generation working mode is a working medium power generation mode and the power generation scene change condition is excessive heat supply, increasing the flow of a fifth working medium flowing into the energy storage module to store energy.
As an improvement of the above scheme, the working medium power generation unit is further configured to: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is insufficient heat supply, the supercritical carbon dioxide is subjected to supplementary heating through the high-temperature heat storage device in the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
As an improvement of the above scheme, the working medium power generation unit is further used for: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is a heat supply fault, the energy is released through the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
Another embodiment of the present invention provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program runs, a device on which the computer-readable storage medium is located is controlled to execute the supercritical carbon dioxide power generation method as described above.
Another embodiment of the present invention provides a supercritical carbon dioxide power generation system, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor, when executing the computer program, implements the supercritical carbon dioxide power generation method as described above.
Compared with the prior art, the technical scheme has the following beneficial effects:
the invention provides a supercritical carbon dioxide power generation method, a supercritical carbon dioxide power generation device, a supercritical carbon dioxide readable storage medium and a supercritical carbon dioxide power generation system.
Furthermore, the supercritical carbon dioxide power generation method, the supercritical carbon dioxide power generation device, the computer readable storage medium and the supercritical carbon dioxide power generation system further improve the economy and the utilization efficiency of stored energy by storing pressure energy of high-pressure supercritical carbon dioxide and storing the multi-waste heat energy of the system in a classified manner.
Drawings
FIG. 1 is a schematic flow diagram of a supercritical carbon dioxide power generation process according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a supercritical carbon dioxide power generation device according to an embodiment of the present invention;
fig. 3 is a diagram illustrating an exemplary structure of a supercritical carbon dioxide power generation system according to an embodiment of 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.
Detailed description of the preferred embodiment
The embodiment of the invention firstly describes a supercritical carbon dioxide power generation method. Fig. 1 is a schematic flow chart of a supercritical carbon dioxide power generation method according to an embodiment of the present invention.
As shown in fig. 1, the supercritical carbon dioxide power generation method includes:
s1, acquiring a running parameter group of the power generation and energy storage integrated system, and determining a power generation working mode and a power generation scene change condition according to the running parameter group.
In order to adapt to switching of power generation requirements which may change in real time and achieve flexible power generation, in an embodiment of the present invention, first, operation parameters of a power generation and energy storage integrated system need to be obtained to determine a current power generation operation mode (described as "power generation operation mode" herein) and a changed power generation requirement (described as "power generation scene change condition" herein).
The power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions comprise load reduction, load increase, peak power utilization, excessive heat supply, insufficient heat supply and heat supply faults; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module. The energy storage module comprises but is not limited to a high-temperature heat storage device, a low-temperature heat storage device, a pressure storage device and a gas storage device; the main power generation module comprises but is not limited to a main path turbine and a main path generator; the heat supply module includes, but is not limited to, a compressor and a heat source unit.
And S21, when the power generation working mode is an energy storage power generation mode, driving the main power generation module to generate power through the energy storage module.
S22, when the power generation working mode is a working medium power generation mode and the power generation scene change condition is that the load is reduced, reducing the flow of a first working medium flowing into the main power generation module according to a preset first working medium flow adjusting method, and performing working medium power generation and energy storage through supercritical carbon dioxide according to the flow of the first working medium.
When the load needs to be reduced, under the condition that the flow of the working medium passing through the compressor and the heat source unit is kept unchanged, the output of the main path turbine is reduced to reduce the load, and meanwhile, redundant heat and redundant electric energy are effectively stored.
And S32, when the power generation working mode is a working medium power generation mode and the power generation scene change condition is the increased load, adjusting the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module according to a preset second working medium flow adjusting method, and performing working medium power generation and energy storage through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
When the load needs to be increased, the flow of the working medium flowing into the energy storage subsystem is reduced under the condition that the flow of the working medium passing through the compressor and the heat source unit is kept unchanged, the flow of the working medium flowing into the main path turbine is increased, and then the expansion work of the main path turbine is increased to increase the load.
When the power consumption peak is reached, the working medium flow in the power generation cycle of the main loop keeps full load operation, the working medium flow flowing into the auxiliary path turbine is gradually increased, and then the generated energy of the auxiliary path generator is increased to meet the power consumption demand during the power consumption peak. That is, in one embodiment, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change situation is peak power utilization, operating the main power generation module in a full load mode to generate power, and increasing a fourth working medium flow flowing into the auxiliary power generation module to perform working medium power generation through supercritical carbon dioxide according to the fourth working medium flow; therefore, the auxiliary turbine set is used for applying work during the peak power consumption, the single installed capacity of the main turbine can be reduced, and the investment is reduced.
When the heat of the heat source unit is sufficient and excessive, the normal power generation circulation of the main loop is kept, the flow of the working medium flowing into the energy storage subsystem is gradually increased, and the excessive heat is stored in the energy storage subsystem in the form of heat energy and pressure energy. That is, in one embodiment, the power generation method further includes: and when the power generation working mode is a working medium power generation mode and the power generation scene change condition is excessive heat supply, increasing the flow of a fifth working medium flowing into the energy storage module to store energy.
When the heat supply of the heat source unit is insufficient, supplementary heating is carried out through the high-temperature heat storage device, so that the power generation system can work normally. That is, in one embodiment, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is insufficient heat supply, the supercritical carbon dioxide is subjected to supplementary heating through the high-temperature heat storage device in the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide. When the supplementary heating is carried out, the main power generation module is driven to carry out working medium power generation through the supercritical carbon dioxide, and when the main power generation module is insufficient in power generation, the auxiliary power generation module is started.
When the heat source unit is supplied without heat or the compressor fails, the energy storage subsystem releases energy to drive the main turbine or the auxiliary turbine to expand and do work, so that the power generation system works normally. That is, in one embodiment, the power generation method further includes: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is a heat supply fault, energy is released through the energy storage module so as to perform working medium power generation through supercritical carbon dioxide.
In order to improve the economy and the tolerability of the storage technology, in one embodiment the energy storage module is used for storing thermal energy and pressure energy separately, in particular, high pressure supercritical carbon dioxide is generated by compressing gaseous carbon dioxide, pressure is stored by means of a pressure storage device, and part of the excess thermal energy in the system is stored in the form of pressure energy. By the mode, not only heat energy is stored, but also the pressure energy of the compressed carbon dioxide is stored, when the electricity consumption peak is high or the heat source unit does not have heat and needs to release energy, the pressure storage device sequentially exchanges heat with the low-temperature heat storage device and the high-temperature heat storage device through pressure release, the high-pressure supercritical carbon dioxide working medium extracts the low-temperature heat energy and the high-temperature heat energy stored in the energy storage system, fuel is not required to be additionally consumed, and the turbine can be driven to do work without power consumption in the energy release stage.
In one embodiment, the energy storage module is further configured to store the thermal energy in a classified manner according to the temperature of the thermal energy; specifically, the high-temperature heat storage device is arranged for storing high-temperature heat energy, and the low-temperature heat storage device is arranged for storing low-temperature heat energy, so that the pressure storage working medium in the supercritical carbon dioxide storage tank in the pressure storage device can be stored at a lower temperature, and the system safety is improved; meanwhile, in the energy release process, the carbon dioxide working medium is preheated by using low-temperature heat energy, so that the utilization rate of the waste heat of the system is improved.
The embodiment of the invention describes a supercritical carbon dioxide power generation method, which determines actual conditions such as a power generation working mode, a power generation scene change condition and the like through an operation parameter group of a power generation and energy storage integrated system, so that power generation is carried out in a corresponding mode according to the power generation working mode and the power generation scene change condition in an adaptive manner; furthermore, the supercritical carbon dioxide power generation method described in the embodiment of the invention further improves the economy and utilization efficiency of stored energy by storing the pressure energy of the high-pressure supercritical carbon dioxide and storing the system excess heat energy in a classified manner.
Detailed description of the invention
Besides the method, the embodiment of the invention also discloses a supercritical carbon dioxide power generation device. Fig. 2 is a schematic structural diagram of a supercritical carbon dioxide power generation device according to an embodiment of the present invention.
As shown in fig. 2, the power generation device includes a mode determination unit 101, an energy storage power generation unit 102, and a working medium power generation unit 103.
The mode determining unit 101 is configured to obtain a set of operation parameters of the power generation and energy storage integrated system, and determine a power generation operating mode and a power generation scene change condition according to the set of operation parameters. The power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions are load reduction and load increase; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module.
The energy storage and power generation unit 102 is configured to drive the main power generation module to generate power through the energy storage module when the power generation operating mode is an energy storage and power generation mode.
The working medium power generation unit 103 is used for reducing the flow of a first working medium flowing into the main power generation module according to a preset first working medium flow regulation method when the power generation working mode is a working medium power generation mode and the power generation scene change condition is load reduction, and performing working medium power generation and energy storage through supercritical carbon dioxide according to the flow of the first working medium; when the power generation working mode is a working medium power generation mode and the power generation scene change condition is load increase, the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module are adjusted according to a preset second working medium flow adjusting method, and working medium power generation and energy storage are carried out through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
In one embodiment, the working matter power generation unit 103 is further configured to: when the power generation working mode is a working medium power generation mode and the power generation scene change situation is peak power utilization, the main power generation module is operated in a full load mode to generate power, the fourth working medium flow flowing into the auxiliary power generation module is increased, and working medium power generation is performed through supercritical carbon dioxide according to the fourth working medium flow.
In one embodiment, the working matter power generation unit 103 is further configured to: and when the power generation working mode is a working medium power generation mode and the power generation scene change condition is excess heat supply, increasing the flow of a fifth working medium flowing into the energy storage module to store energy.
In one embodiment, the working matter power generation unit 103 is further configured to: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is insufficient heat supply, the supercritical carbon dioxide is subjected to supplementary heating through the high-temperature heat storage device in the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
In one embodiment, the working matter power generation unit 103 is further configured to: when the power generation working mode is a working medium power generation mode and the power generation scene change condition is a heat supply fault, energy is released through the energy storage module so as to perform working medium power generation through supercritical carbon dioxide.
Wherein, the integrated unit of the supercritical carbon dioxide power generation device can be stored in a computer readable storage medium if the integrated unit is realized in the form of a software functional unit and is sold or used as an independent product. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-described embodiments of the method may be implemented. That is, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the supercritical carbon dioxide power generation method as described above.
Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relationship between the units indicates that the units have communication connection therebetween, and the connection relationship can be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement without inventive effort.
The embodiment of the invention describes a supercritical carbon dioxide power generation device and a computer readable storage medium, which determine actual conditions such as a power generation working mode, a power generation scene change condition and the like through a running parameter group of a power generation and energy storage integrated system, so that power generation is carried out in a corresponding mode according to the power generation working mode and the power generation scene change condition in an adaptive manner; furthermore, the supercritical carbon dioxide power generation device and the computer readable storage medium described in the embodiments of the present invention further improve the economy and utilization efficiency of energy storage by storing pressure energy of high-pressure supercritical carbon dioxide and storing the system excess heat energy in a classified manner.
Detailed description of the invention
In addition to the above method and apparatus, embodiments of the present invention also describe a supercritical carbon dioxide power generation system.
The power generation system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor controlling the various functional components comprised by the power generation system when executing the computer program to implement the supercritical carbon dioxide power generation method as described above.
To further illustrate the present invention, reference is made to FIG. 3, which illustrates an exemplary, but not limiting, embodiment of the present invention as embodied in a power generation system. In FIG. 3, 1-compressor; 2-a heat source unit; 3-main path turbine; 4-a cooler; 5-a side road turbine; 6-an electric motor; 7-main path generator; 8-a side generator; 9-main path turbine regulating valve; 10-auxiliary turbine regulating valve; 11-a primary loop valve; 12-energy storage shunt regulating valve; 13-a high temperature heat storage device; 14-a cryogenic heat exchanger; 15-a low temperature heater; 16-low temperature hot pot; 17-a low temperature hot tank outlet valve; 18-low temperature heat tank medium pump; 19-a low-temperature cooling tank; 20-a cryogenic cold tank outlet valve; 21-cryogenic cold tank medium pump; 22-a pressure storage inlet valve; 23-a supercritical carbon dioxide storage tank; 24-a pressure storage outlet valve; 25-gas storage reservoir inlet valve; 26-gas storage cooler; 27-a gas storage; 28-outlet valve of gas storage; 29-a heat-supplementing circulation bypass; 30-a supplemental heat bypass valve; 31-buffer tank.
The normal temperature and pressure flexible gas storage is an oversized flexible gas storage, the storage capacity is oversized, and the capacity of a single gas storage is generally 10 ten thousand meters 3 Grade sum 100 km 3 The maximum volume of the single body can reach 1000 ten thousand m 3 Above, the normal atmospheric state storage volume of improvement pressure storage working medium that can be very big to provide more powerful carbon dioxide long term pressure storage system, can be for the supporting super powerful long term energy storage system of constructing of super high power station more than GW level, consequently can construct more large-scale electricity generation energy storage couplingThe system has higher comprehensive utilization value, is suitable for large-scale heat energy development, and is particularly suitable for large-scale photo-thermal resource and dry-hot rock geothermal energy development.
In practical implementation, the power generation system further comprises a power generation subsystem and an energy storage subsystem; the power generation subsystem comprises a compressor (1), a heat source unit (2), a turbine, a cooler (4) and a generator, wherein the compressor (1), the heat source unit (2), the turbine and the cooler (4) are sequentially communicated to form a circulation loop; the energy storage subsystem comprises a high-temperature heat storage device (13), a low-temperature heat storage device, a pressure storage device and a gas storage device, and not only is high-temperature heat energy and low-temperature heat energy stored, but also pressure energy of compressed carbon dioxide is stored, so that the energy storage subsystem can drive a turbine to do work without extra consumption of fuel, power and electricity during energy release, and the economy of the system is greatly improved.
Specifically, the outlet of the gas storage device is communicated with the inlet of the compressor (1), and is communicated with the inlet of the pressure storage device through the compressor (1), the heat source unit (2), the high-temperature heat storage device (13) and the low-temperature heat storage device which are sequentially communicated, so that when the heat of the heat source is sufficient or the load is reduced, redundant heat and electric energy can be stored through high-temperature heat storage, low-temperature heat storage and compressed gas pressure storage; the outlet of the pressure storage device is communicated with the inlet of the gas storage device through the low-temperature heat storage device, the high-temperature heat storage device (13), the turbine and the cooler (4) which are sequentially communicated, and when a heat source is free of heat or insufficient in heat, or in a power consumption peak, or in a compressor failure, the turbine can be driven to expand to do work and drag a generator to generate power through high-temperature heat release, low-temperature heat release and pressure release, so that the normal operation of the system is effectively ensured.
The system takes supercritical carbon dioxide as a power working medium, a heat transfer working medium and a pressure storage working medium, and is integrally provided with a power generation, heat storage and pressure storage coupling system, so that redundant heat and electric energy can be stored while power is generated, and when the heat of a heat source unit (2) is insufficient, or no heat is supplied, or a compressor (1) breaks down, the energy can be released by an energy storage subsystem to ensure that the power generation subsystem normally works, so that power generation and energy storage are organically combined, and the coupling degree of the power generation system and the energy storage system is high. The inlet of the energy storage subsystem is provided with an energy storage shunt regulating valve (12) which can regulate the flow of working media entering the energy storage subsystem, and further, the energy storage shunt regulating valve, the energy storage subsystem and the power generation subsystem are matched to realize power change by regulating the flow of the working media entering the main road turbine or the auxiliary road turbine, so that the operation control of the load change process under different working conditions is realized, stable power supply is realized by matching with the actual power generation requirement, the flexibility and the economical efficiency of the system are greatly improved, and the system has advantages in the aspects of power generation as required, power generation flexibility and the like.
The turbine comprises a main path turbine (3) and an auxiliary path turbine (5), a main path turbine regulating valve (9) is arranged at an inlet of the main path turbine (3) and used for regulating the flow of a working medium entering the main path turbine (3) so as to enable a main path turbine unit to adapt to load change, and the main path turbine (3) is connected with a main path generator (7) and further matches with actual power generation requirements, so that the flexibility of the system is further improved. The bypass is provided with an auxiliary turbine (5) and an auxiliary generator (8) between the inlet of the main turbine regulating valve (9) and the outlet of the main turbine (3), the auxiliary turbine (5) is connected with the auxiliary generator (8) and is suitable for performing expansion work to increase the generated energy of the system during the power utilization peak, and according to the description, the auxiliary turbine set is used for performing work during the power utilization peak, so that the single machine installed capacity of the main turbine can be reduced, the full-load working time of the main turbine is prolonged, the economical efficiency is good, and the system investment is reduced. The inlet of the auxiliary turbine (5) is provided with an auxiliary turbine regulating valve (10) for regulating the flow of the working medium entering the auxiliary turbine (5) so as to enable the auxiliary turbine set to adapt to the load change during the electricity peak, thereby matching the actual power generation requirement during the electricity peak and further improving the flexibility of the system. The main path turbine (3) and the auxiliary path turbine (5) are at least one group, so that the system can be suitable for different load requirements, each group of main path turbine (3) and each group of auxiliary path turbine (5) comprise single-stage or multi-stage turbine expansion machines, and the arrangement method of each group of main path turbine (3) and each group of auxiliary path turbine (5) is not limited to the arrangement part contained in the figure 3.
The heat storage form of the high-temperature heat storage device (13) is one or more of sensible heat, latent heat or chemical reaction heat, the heat exchange form is that a heat transfer working medium exchanges heat with a heat storage medium through a heat exchange surface or directly contacts a heat storage material, the adopted heat storage medium comprises, but is not limited to, molten salt and heat transfer oil, and the adopted heat storage material comprises, but is not limited to, metal and alloy thereof, rock or concrete. According to the above description, the high-temperature heat storage device is arranged to store the excess heat energy in the system, so that the heat source system can operate at full load, the daily output of the heat energy of the heat source unit can be directly increased, and the heat storage technology is more mature and cheaper than other large-scale energy storage technologies.
The low-temperature heat storage device comprises a low-temperature heat exchanger (14), a low-temperature heater (15), a low-temperature hot tank (16) and a low-temperature cold tank (19), and low-temperature heat storage media filled in the low-temperature hot tank (16) and the low-temperature cold tank (19) respectively comprise water; by arranging the low-temperature heat storage device, low-grade heat energy with low temperature after high-temperature heat exchange is recovered and stored in the low-temperature heat tank (16) in the energy storage process; in the energy releasing process, the low-grade heat energy stored in the low-temperature hot tank (16) preheats the carbon dioxide working medium through the low-temperature heater (15), so that the low-grade heat energy can be converted into high-grade electric energy, and the utilization rate of the waste heat of the system is improved.
A cold side outlet of the low-temperature heat exchanger (14) is communicated with an inlet of a low-temperature hot tank (16); a cold side inlet of the low-temperature heat exchanger (14) is communicated with an outlet of a low-temperature cold tank (19); and a low-temperature cold tank outlet valve (20) and a low-temperature cold tank medium pump (21) which are communicated along the fluid flowing direction are arranged on an outlet pipeline of the low-temperature cold tank (19).
A hot side outlet of the low-temperature heater (15) is communicated with an inlet of a low-temperature cooling tank (19); a hot side inlet of the low-temperature heater (15) is communicated with an outlet of the low-temperature hot tank (16); and a low-temperature hot tank outlet valve (17) and a low-temperature hot tank medium pump (18) which are communicated along the fluid flowing direction are arranged on an outlet pipeline of the low-temperature hot tank (16).
The pressure storage device comprises a pressure storage inlet valve (22), a supercritical carbon dioxide storage tank (23) and a pressure storage outlet valve (24) which are sequentially communicated, the pressure storage medium of the supercritical carbon dioxide storage tank (23) is supercritical carbon dioxide, and at least one supercritical carbon dioxide storage tank (23) is provided. According to the structure described above, high-pressure supercritical carbon dioxide is generated by compressing gaseous carbon dioxide, pressure is stored by using the pressure storage device, and part of excess heat energy in the system is stored in the form of pressure energy, so that the system is more economical and has a larger energy storage scale compared with other electric energy storage technologies.
The outlet of the heat source unit (2) is divided into two paths, wherein one path is communicated with the inlet of the main path turbine (3) and the inlet of the auxiliary path turbine (5); the other path is communicated with a hot side inlet of a high-temperature heat storage device (13) through the energy storage shunt regulating valve (12), a hot side outlet of the high-temperature heat storage device (13) is communicated with a hot side inlet of a low-temperature heat exchanger (14), a hot side outlet of the low-temperature heat exchanger (14) is communicated with an inlet of a supercritical carbon dioxide storage tank (23) through a pressure storage inlet valve (22), an outlet of the supercritical carbon dioxide storage tank (23) is communicated with a cold side inlet of a low-temperature heater (15) through a pressure storage outlet valve (24), a cold side outlet of the low-temperature heater (15) is communicated with a cold side inlet of the high-temperature heat storage device (13), and a cold side outlet of the high-temperature heat storage device (13) is communicated with an inlet of a main path turbine (3) and an inlet of an auxiliary path turbine (5). According to the structure and the connection, when energy is required to be stored, the energy storage subsystem stores high-temperature heat energy and low-temperature heat energy and also stores pressure energy of compressed carbon dioxide, and when energy is required to be released, the pressure storage device sequentially exchanges heat with the low-temperature heat storage device and the high-temperature heat storage device through pressure release of the high-pressure supercritical carbon dioxide working medium, so that the low-temperature heat energy and the high-temperature heat energy stored in the energy storage system are extracted, fuel is not required to be additionally consumed, and the turbine can be driven to do work without power consumption in the energy release stage.
The gas storage device comprises a gas storage inlet valve (25), a gas storage cooler (26), a gas storage (27) and a gas storage outlet valve (28) which are sequentially communicated along the flowing direction of the airflow, the gas storage (27) is used for storing gaseous carbon dioxide under normal pressure or pressure state, the gas storage (27) comprises but is not limited to one or more of a membrane type flexible gas storage, a steel structure flexible membrane composite gas holder and an underground gas storage, and the membrane type flexible gas storage, the steel structure flexible membrane composite gas holder and the underground gas storage are one or more of the above components, wherein the membrane type flexible gas storage, the air storage and the air storage are sequentially communicated along the flowing direction of the airflow,The steel structure flexible membrane composite gas holder has changeable gas storage volume and is used for storing gaseous carbon dioxide at normal temperature and normal pressure, the underground gas storage is used for storing gaseous carbon dioxide under a pressure state, and the number of the gas storage is at least one. The number and the structural form of the gas storage banks are determined by the gas storage amount, local geological conditions and environmental factors, the destructive power of a typhoon frequent area on the flexible gas storage banks is huge, the underground gas storage banks can avoid the damage caused by typhoons, and the underground gas storage banks are also suitable for storing gaseous carbon dioxide in a pressure state, so that the pressure energy of exhaust gas after work is done by a turbine is recovered, and the energy consumption of a downstream compressor is reduced. Wherein, the membrane type flexible gas storage is an oversized flexible gas storage, the storage capacity is oversized, and the capacity of the single gas storage is generally 10 ten thousand meters 3 Grade sum 100 km 3 The maximum volume of the single body can reach 1000 ten thousand meters 3 More than, the normal atmospheric state storage volume of improvement pressure storage working medium that can be very big to provide more powerful carbon dioxide long term pressure storage system, a plurality of monomer gas storages make up the use and can be the supporting super-powerful long term energy storage system of construction of super-power station more than GW level, consequently can build more large-scale electricity generation energy storage coupled system, and the value of comprehensive utilization is higher, is applicable to extensive heat energy development, especially is fit for large-scale light and heat resource and the development of hot dry rock geothermal energy.
The gas storage cooler (26) is used for cooling the carbon dioxide working medium entering the gas storage (27) again so that the pressure and the temperature of the gaseous carbon dioxide flowing into the gas storage meet the storage requirement of the gas storage (27); the hot side inlet of the gas storage cooler (26) is communicated with the hot side outlet of the cooler (4) through the gas storage inlet valve (25); the outlet of the gas storage (27) is communicated with the inlet of the compressor (1) through a gas storage outlet valve (28).
The heat source unit (2) is used for providing heat and exchanging heat with a circulating working medium of the power generation subsystem, and the heat exchange form is that the circulating working medium exchanges heat with the heat source through a heat exchange surface or directly contacts with heat-containing substances in the heat source, so that the heat source unit (2) can be coupled with heat sources of different types and grades for heat collection, and environment-friendly and renewable heat energy resources such as solar photo-heat, dry hot rocks and the like are fully utilized.
Set up between the export of heat source unit (2) and the cold side entry of high temperature heat-retaining device (13) and mend hot circulation bypass (29), be equipped with on the bypass of mend hot circulation (29) pipeline and mend hot bypass valve (30), be equipped with on the main loop pipeline between the export of heat source unit (2) and the cold side export of high temperature heat-retaining device (13) main loop valve (11), according to the structure of the aforesaid, mend hot circulation bypass (29) and can guarantee to carry out the supplemental heating when the heat source heat is not enough, reinforcing power generation system reliability, guarantee that the system is normally supplied power to the outside.
The power generation subsystem is a supercritical carbon dioxide Brayton (Brayton) cycle power generation system, the cycle working medium is carbon dioxide, and the supercritical carbon dioxide power cycle has the advantages of high energy density, compact system structure, high cycle efficiency and the like.
The number of the compressors (1) is at least one, each group of compressors (1) comprises a single-stage compressor or a multi-stage compressor, interstage cooling is adopted in multi-stage compression, the pressure of a carbon dioxide circulating working medium can be improved through multi-stage compression, and the power consumption of the compressors is reduced; the upstream of compressor (1) is provided with buffer tank (31), can protect compressor unit not appear surging when opening and stop or emergency, in addition when gas storage device breaks down or overhauls, can be in the time of the energy storage for pressure storage device provides the pressure storage medium of low pressure, further guarantees reliability and security in this system use.
When the system is used, under normal conditions, the main loop valve (11) and the main loop turbine regulating valve (9) are opened, the auxiliary loop turbine regulating valve (10), the energy storage shunt regulating valve (12), the air storage inlet valve (25), the air storage outlet valve (28), the pressure storage inlet valve (22) and the pressure storage outlet valve (24) are closed, power generation circulation of the main loop is carried out, the energy storage subsystem is in a closed state, a carbon dioxide working medium in circulation flows into the compressor (1) to be compressed to preset pressure, and flows into the heat source unit (2) to be heated after being compressed, a high-temperature high-pressure supercritical carbon dioxide working medium is formed after heating, the high-temperature high-pressure supercritical carbon dioxide working medium flows into the main loop turbine (3) to be expanded to do work and drag the main loop generator (7) to rotate to generate power, after the carbon dioxide working medium completes the work, carbon dioxide exhaust gas flowing out of the main loop turbine (3) enters the cooler (4) to be cooled, flows into the compressor (1) through the buffer tank (31) after cooling, and power generation circulation of the main loop is carried out again.
When the load operation is reduced, the working medium flow and pressure of the compressor (1) and the heat source unit (2) are unchanged, the energy storage shunt regulating valve (12) and the pressure storage inlet valve (22) are opened, the energy storage shunt regulating valve (12) and the pressure storage inlet valve (22) are gradually opened, or the valve port of the main path turbine regulating valve (9) is gradually closed, so that the carbon dioxide working medium in the main loop of the main path turbine (3) is gradually reduced to run, and the redundant carbon dioxide working medium sequentially passes through the energy storage shunt regulating valve (12), the high-temperature heat storage device (13) and the low-temperature heat storage device and flows into the pressure storage device to be stored; when the flow of the carbon dioxide working medium passing through the main path turbine (3) is reduced to meet the load requirement, opening the outlet valve (28) of the gas storage bank, and continuing to gradually open the valve ports of the large energy storage flow dividing and adjusting valve (12), the outlet valve (28) of the gas storage bank and the pressure storage inlet valve (22), wherein the flow output of the gaseous carbon dioxide working medium stored in the gas storage bank (27) is gradually increased, so that the flow of the working medium passing through the compressor (1) and the heat source unit (2) is unchanged after the circulation working medium of the main loop is reduced in amount and runs; gaseous carbon dioxide working media flowing out of the gas storage (27) and carbon dioxide working media in a main loop power generation cycle are collected through a pipeline and a pipe and then flow into the compressor (1), the carbon dioxide working media are compressed to preset pressure through the compressor (1) and then flow into the heat source unit (2) for heating, the heated carbon dioxide working media are divided into two paths, one path of carbon dioxide working media is reduced in flow, then flows into the main path turbine (3) for expansion to do work and drag the main path generator (7) to generate power, so that the generated energy of the main path generator (7) is reduced to reduce load, and carbon dioxide exhaust gas after doing work enters the compressor (1) through the cooler (4) and the buffer tank (31) to perform the main loop cycle again; the other path of carbon dioxide working medium sequentially flows into the high-temperature heat storage device (13), the low-temperature heat storage device and the pressure storage device through the energy storage shunt regulating valve (12), redundant heat is sequentially stored into the high-temperature heat storage device (13) and the low-temperature heat storage device through heat exchange, and redundant electric energy is stored into the pressure storage device in a pressure energy mode.
The adjustment targets are: under the condition of keeping the flow of the working medium passing through the compressor (1) and the heat source unit (2) unchanged, the output of the main path turbine (3) is reduced to reduce the load, and meanwhile, redundant heat and redundant electric energy are effectively stored.
When the load is increased to operate, the working medium flow and pressure of the compressor (1) and the heat source unit (2) are kept unchanged, the valve ports of the energy storage shunt regulating valve (13) and the pressure storage inlet valve (22) are gradually closed, or the valve ports of the main path turbine regulating valve (9) are gradually opened simultaneously, and the flow of the carbon dioxide working medium flowing into the main path turbine (3) is gradually increased; when the flow of the carbon dioxide working medium flowing into the main path turbine (3) is increased to meet the load requirement, a valve port of an outlet valve (28) of the gas storage reservoir is closed, the flow of the carbon dioxide working medium flowing out of the gas storage reservoir (27) is reduced, and the working medium flow passing through the compressor (1) and the heat source unit (2) is unchanged after the increment operation of the main loop circulating working medium; the flow of the carbon dioxide working medium flowing into the main path turbine (3) is increased and then expansion work is increased, so that the generating capacity of the main path generator (7) is increased and the load is increased.
The adjustment targets are: under the condition of keeping the flow of the working medium passing through the compressor (1) and the heat source unit (2) unchanged, the flow of the working medium flowing into the energy storage subsystem is reduced, the flow of the working medium flowing into the main path turbine (3) is increased, and then the expansion work of the main path turbine (3) is increased to increase the load.
When the electricity consumption is high, the main loop power generation circulation is carried out at full load, the outlet valve (28) of the gas storage warehouse and the pressure storage inlet valve (22) are closed, the auxiliary path turbine regulating valve (10), the pressure storage outlet valve (24) and the gas storage warehouse inlet valve (25) are opened, the supercritical carbon dioxide working medium stored in the pressure storage device flows out of the supercritical carbon dioxide storage tank (23), sequentially flows into the low-temperature heat storage device and the high-temperature heat storage device (13) to absorb heat and raise temperature to generate high-temperature and high-pressure supercritical carbon dioxide, the raised high-temperature and high-pressure supercritical carbon dioxide working medium flows into the auxiliary path turbine (5) to expand and do work and drag the auxiliary path power generator (8) to generate power, the carbon dioxide exhaust gas output by the auxiliary path turbine (5) after releasing pressure and doing work is mixed with the carbon dioxide exhaust gas output by the main path turbine (3) and then enters the cooler (4) to be cooled, the cooled carbon dioxide exhaust gas is divided into two paths, one path of the carbon dioxide exhaust gas enters the compressor unit (1) to carry out the main loop power generation circulation again, the carbon dioxide exhaust gas flows into the gas storage warehouse (26) to be cooled again to be stored in the gas storage warehouse (27).
The adjustment targets are: the working medium flow in the power generation cycle of the main loop keeps full load operation, the working medium flow flowing into the auxiliary circuit turbine (5) is gradually increased, and then the generated energy of the auxiliary circuit generator (8) is increased to meet the power demand during the peak time of power utilization.
When the heat of the heat source unit (2) is sufficient and excessive, the main loop keeps normal operation in a circulating mode, the pressure storage outlet valve (24) and the gas storage inlet valve (25) are closed, valve ports of the energy storage shunt regulating valve (12), the gas storage outlet valve (28) and the pressure storage inlet valve (22) are opened and gradually enlarged, gaseous carbon dioxide flowing out of the gas storage (27) and carbon dioxide circulating working media of the main loop flow into the compressor (1) after being combined through a pipeline, and the rotating speed of a rotating part of the compressor (1) is increased so that the flow rate of the carbon dioxide working media in the compressor (1) is increased, and the carbon dioxide circulating flow of the main loop is guaranteed to be unchanged; the carbon dioxide working medium is compressed to a preset pressure by the compressor (1), flows into the heat source unit (2) for heating after being compressed, and is divided into two paths after being heated, wherein one path of the carbon dioxide working medium flows into the main path turbine (3) to expand and do work and drag the main path generator (7) to generate power, the carbon dioxide working medium flows into the cooler (4) for cooling after doing work, and the carbon dioxide working medium enters the compressor (1) after being cooled to perform the next main loop power generation cycle; the other path of carbon dioxide working medium sequentially flows into the high-temperature heat storage device (13), the low-temperature heat storage device and the pressure storage device through the energy storage shunt regulating valve (12), redundant heat is stored in the high-temperature heat storage device (13) and the low-temperature heat storage device respectively, and redundant electric energy is stored in the pressure storage device in a pressure energy mode.
The adjustment targets are: and maintaining a normal main loop power generation cycle, gradually increasing the flow of the working medium flowing into the energy storage subsystem, and storing the surplus heat in the energy storage subsystem in the form of heat energy and pressure energy.
When the heat supply of the heat source unit (2) is insufficient, the main loop valve (11), the gas storage inlet valve (25), the gas storage outlet valve (28), the pressure storage inlet valve (22) and the pressure storage outlet valve (24) are closed, the heat supplementing bypass valve (30) is opened, the carbon dioxide working medium in circulation is heated by the heat source unit (2), flows into the high-temperature heat storage device (13) through the heat supplementing circulation bypass (29) after being heated to further absorb heat, the temperature of the working medium is increased, then flows into the main path turbine (3) or the auxiliary path turbine (5) to expand and do work and respectively drag the main path generator (7) or the auxiliary path generator (8) to generate electricity, the carbon dioxide exhaust gas after doing work is cooled by the cooler (4) and then enters the compressor (1) to be compressed, the carbon dioxide working medium after being compressed enters the heat source unit (2) to be heated again, and the next circulation is carried out after heating.
The adjustment targets are: and supplementary heating is carried out through the high-temperature heat storage device (13) so as to ensure that the power generation system works normally.
When the heat source unit (2) is supplied without heat or the compressor (1) breaks down, the compressor (1) stops working, the main loop valve (11), the air storage outlet valve (28) and the pressure storage inlet valve (22) are closed, the pressure storage outlet valve (24) and the air storage inlet valve (25) are opened, high-pressure supercritical carbon dioxide working media stored in the supercritical carbon dioxide storage tank (23) sequentially flow into the low-temperature heat storage device and the high-temperature heat storage device (13) to absorb heat to generate high-temperature high-pressure supercritical carbon dioxide, the high-temperature high-pressure supercritical carbon dioxide working media after heat absorption flow into the main path turbine (3) or the auxiliary path turbine (5) to do work through expansion and respectively drag the main path generator (7) or the auxiliary path generator (8) to generate work, carbon dioxide exhaust gas flowing out of the main path turbine (3) or the auxiliary path turbine (5) flows into the cooler (4) to be cooled, the carbon dioxide exhaust gas after cooling flows into the air storage cooler (26) to be cooled again, and the carbon dioxide gas after cooling again flows into the air storage reservoir (27) to be stored.
The adjustment targets are: the energy storage subsystem releases energy to drive the main turbine (3) or the auxiliary turbine (5) to do work through expansion, so that the power generation system works normally.
In another use embodiment, during energy storage, gaseous carbon dioxide stored in a gas storage (27) flows into a compressor (1) through a gas storage outlet valve (28), the gaseous carbon dioxide is compressed to a preset pressure by the compressor (1) to generate high-pressure supercritical carbon dioxide, a compressed carbon dioxide working medium flows into a heat source unit (2) to be heated, the high-temperature high-pressure supercritical carbon dioxide is generated after heating and temperature rising, the high-temperature high-pressure supercritical carbon dioxide flows into the hot side of a high-temperature heat storage device (13) through an energy storage shunt regulating valve (12) to exchange heat, and part of heat carried by the high-temperature high-pressure supercritical carbon dioxide is transferred into the high-temperature heat storage device (13) to be stored, so that high-temperature heat storage is completed; the carbon dioxide working medium after completing high-temperature heat storage flows into the low-temperature heat storage device, exchanges heat with the low-temperature heat storage medium in the low-temperature heat exchanger (14), meanwhile, the low-temperature heat storage medium is pumped out of the low-temperature cold tank (19) through the low-temperature cold tank outlet valve (20) and the low-temperature cold tank medium pump (21), absorbs heat through the low-temperature heat exchanger (14), and flows into the low-temperature heat tank (16) to be stored after absorbing heat, so that waste heat carried by high-temperature and high-pressure supercritical carbon dioxide is transferred to the low-temperature heat storage device to be stored, and low-temperature heat storage is completed; after low-temperature heat storage is finished, the carbon dioxide working medium flows into a supercritical carbon dioxide storage tank (23) to be stored, and pressure storage is carried out.
When energy is released, the low-temperature heat storage medium is pumped out of the low-temperature hot tank (16) through the low-temperature hot tank outlet valve (17) and the low-temperature hot tank medium pump (18), is released by the low-temperature heater (15) to be cooled, and then flows into the low-temperature cold tank (19) to be stored; meanwhile, the high-pressure supercritical carbon dioxide stored in the supercritical carbon dioxide storage tank (23) absorbs heat carried by the low-temperature heat storage medium pumped out from the low-temperature hot tank (16) through heat exchange of the low-temperature heater (15), so that the heat stored in the low-temperature hot tank (16) is transferred to the supercritical carbon dioxide working medium again; the carbon dioxide working medium after heat exchange and temperature rise flows into the cold side of the high-temperature heat storage device (13) to continuously absorb heat, so that the heat stored in the high-temperature heat storage device (13) is transferred to the supercritical carbon dioxide working medium again; the carbon dioxide working medium further absorbs heat to generate high-temperature high-pressure supercritical carbon dioxide, the high-temperature high-pressure supercritical carbon dioxide working medium flows into the main path turbine (3) or the auxiliary path turbine (5) to do work through expansion, and respectively drags the main path generator (7) or the auxiliary path generator (8) to generate electricity; and after work is done, the carbon dioxide exhaust gas output by the main path turbine (3) or the auxiliary path turbine (5) flows into the cooler (4) to be cooled, the cooled carbon dioxide exhaust gas flows into the gas storage cooler (26) to be cooled again, and the gaseous carbon dioxide after being cooled again flows into the gas storage bank (27) to be stored.
The power generation system provided by the embodiment of the invention has strong multi-link coupling and expansibility, wherein the heat source unit can be coupled with heat sources of different grades to collect heat, the heat storage device can also be coupled with heat energy in different modes outside the system to store heat, and the pressure storage circulation can also be coupled with surplus electricity generated by any power generation technology outside the system to store electricity.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center for the device and that connects the various parts of the overall device using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the apparatus by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The embodiment of the invention describes a supercritical carbon dioxide power generation system, which determines actual conditions such as a power generation working mode, a power generation scene change condition and the like through an operation parameter group of a power generation and energy storage integrated system, so that power generation is carried out in a corresponding mode according to the power generation working mode and the power generation scene change condition in an adaptive manner; furthermore, the supercritical carbon dioxide power generation system described in the embodiment of the invention further improves the economy and utilization efficiency of stored energy by storing pressure energy of high-pressure supercritical carbon dioxide and storing the excess heat energy of the system in a classified manner.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A supercritical carbon dioxide power generation method, characterized in that the power generation method comprises:
acquiring a running parameter group of the power generation and energy storage integrated system, and determining a power generation working mode and a power generation scene change condition according to the running parameter group; the power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions are load reduction and load increase; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module;
when the power generation working mode is an energy storage power generation mode, the energy storage module drives the main power generation module to generate power;
when the power generation working mode is a working medium power generation mode and the power generation scene change condition is that the load is reduced, reducing the flow of a first working medium flowing into the main power generation module according to a preset first working medium flow regulation method, and performing working medium power generation and energy storage through supercritical carbon dioxide according to the flow of the first working medium;
when the power generation working mode is a working medium power generation mode and the power generation scene change condition is the increased load, the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module are adjusted according to a preset second working medium flow adjusting method, and working medium power generation and energy storage are carried out through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
2. The supercritical carbon dioxide power generation method of claim 1 further comprising:
when the power generation working mode is a working medium power generation mode and the power generation scene change situation is peak power utilization, the main power generation module is operated in a full load mode to generate power, the fourth working medium flow flowing into the auxiliary power generation module is increased, and working medium power generation is performed through supercritical carbon dioxide according to the fourth working medium flow.
3. The supercritical carbon dioxide power generation method of claim 1, further comprising:
and when the power generation working mode is a working medium power generation mode and the power generation scene change condition is excessive heat supply, increasing the flow of a fifth working medium flowing into the energy storage module to store energy.
4. The supercritical carbon dioxide power generation method of claim 1, further comprising:
when the power generation working mode is a working medium power generation mode and the power generation scene change condition is insufficient heat supply, the supercritical carbon dioxide is subjected to supplementary heating through the high-temperature heat storage device in the energy storage module so as to perform working medium power generation through the supercritical carbon dioxide.
5. The supercritical carbon dioxide power generation method of claim 1, further comprising:
when the power generation working mode is a working medium power generation mode and the power generation scene change condition is a heat supply fault, energy is released through the energy storage module so as to perform working medium power generation through supercritical carbon dioxide.
6. The supercritical carbon dioxide power generation method according to any one of claims 1 to 5 wherein the energy storage module is used to store thermal energy and pressure energy separately.
7. The supercritical carbon dioxide power generation method according to any one of claims 1 to 5 wherein the energy storage module is further configured to store the thermal energy in a classified manner according to the temperature of the thermal energy.
8. A supercritical carbon dioxide power generation device is characterized by comprising a mode determining unit, an energy storage power generation unit and a working medium power generation unit,
the mode determining unit is used for acquiring a running parameter group of the power generation and energy storage integrated system, and determining a power generation working mode and a power generation scene change condition according to the running parameter group; the power generation working mode comprises a working medium power generation mode and an energy storage power generation mode; the power generation scene change conditions are load reduction and load increase; the power generation and energy storage integrated system comprises an energy storage module, a main power generation module and a heat supply module;
the energy storage power generation unit is used for driving the main power generation module to generate power through the energy storage module when the power generation working mode is an energy storage power generation mode;
the working medium power generation unit is used for reducing the first working medium flow flowing into the main power generation module according to a preset first working medium flow regulation method when the power generation working mode is a working medium power generation mode and the power generation scene change condition is that the load is reduced, and carrying out working medium power generation and energy storage through supercritical carbon dioxide according to the first working medium flow; when the power generation working mode is a working medium power generation mode and the power generation scene change condition is load increase, the flow of a second working medium flowing into the energy storage module and the flow of a third working medium flowing into the heat supply module are adjusted according to a preset second working medium flow adjusting method, and working medium power generation and energy storage are carried out through supercritical carbon dioxide according to the flow of the second working medium and the flow of the third working medium.
9. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the supercritical carbon dioxide power generation method according to any one of claims 1 to 7.
10. A supercritical carbon dioxide power generation system, characterized in that the power generation system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the supercritical carbon dioxide power generation method according to any one of claims 1 to 7.
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