CN116247827B - Industrial park comprehensive energy system and operation method thereof - Google Patents
Industrial park comprehensive energy system and operation method thereof Download PDFInfo
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- CN116247827B CN116247827B CN202310519304.8A CN202310519304A CN116247827B CN 116247827 B CN116247827 B CN 116247827B CN 202310519304 A CN202310519304 A CN 202310519304A CN 116247827 B CN116247827 B CN 116247827B
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Abstract
The invention provides an industrial park comprehensive energy system and an operation method thereof, and relates to the technical field of comprehensive energy. The industrial park comprehensive energy system comprises a main circulation pipeline, a first heat exchange pipeline and a second heat exchange pipeline; the first heat exchange pipeline is connected with the main circulation pipeline in a heat exchange way, and the second heat exchange pipeline is connected with the main circulation pipeline in a heat exchange way; the main circulation pipeline comprises a carbon dioxide charging circulation pipeline and a carbon dioxide power generation circulation pipeline, and the carbon dioxide charging circulation pipeline and the carbon dioxide power generation circulation pipeline are controllably connected through a reversing device. The invention can solve the problems of low heat energy utilization rate and energy waste of the energy storage system, has the effects of high heat energy utilization rate, reduced energy waste, effectively improved working temperature difference and power generation efficiency by utilizing waste heat and residual cold, and carbon neutralization by utilizing carbon dioxide emissions as working media, thereby realizing the recycling utilization of carbon dioxide.
Description
Technical Field
The invention relates to the technical field of comprehensive energy, in particular to an industrial park comprehensive energy system and an operation method thereof.
Background
At present, the industry is striving to realize the double reduction of carbon emission and energy consumption and realize the integral clean transformation of the energy structure. Renewable Energy (Renewable Energy) refers to non-fossil Energy such as wind Energy, solar Energy, water Energy, biomass Energy, geothermal Energy and the like, and is clean Energy. Therefore, the use of renewable energy sources becomes an effective means of assisting the achievement of the above-described objective.
However, the randomness and volatility associated with the addition of large amounts of renewable energy source is contrary to the continuity and order of industrial production, so that additional energy storage systems are required. While the current mainstream energy storage systems (including pumped storage, compressed air storage, flywheel storage, electrochemical storage, etc.) play a significant role in electrical energy storage, there is a significant amount of wasted thermal energy (including residual heat and waste heat), resulting in wasted energy, and it is difficult for existing energy storage systems to perform the function of energy hubs in parks containing multiple industrial forms.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of low heat energy utilization rate and energy waste of an energy storage system in the prior art, thereby providing an industrial park comprehensive energy system and an operation method thereof.
In order to solve the problems, the invention provides an industrial park comprehensive energy system, which comprises a main circulation pipeline, a first heat exchange pipeline and a second heat exchange pipeline; the main circulation pipeline is provided with a first heat exchange device and a second heat exchange device, the first heat exchange pipeline is connected with the main circulation pipeline in a heat exchange way through the first heat exchange device, and the second heat exchange pipeline is connected with the main circulation pipeline in a heat exchange way through the second heat exchange device; the main circulation pipeline is provided with a first circulation direction and a second circulation direction which are opposite to each other, the main circulation pipeline comprises a carbon dioxide charging circulation pipeline running along the first circulation direction and a carbon dioxide power generation circulation pipeline running along the second circulation direction, and the carbon dioxide charging circulation pipeline and the carbon dioxide power generation circulation pipeline are controllably connected through a reversing device.
Optionally, the carbon dioxide charging circulation pipeline is provided with a compression device and a throttling device, and the compression device, the first heat exchange device, the throttling device and the second heat exchange device are sequentially arranged along the first circulation direction.
Optionally, the carbon dioxide power generation circulation pipeline is provided with an expansion device and a first fluid conveying device, and the first heat exchange device, the expansion device, the second heat exchange device and the first fluid conveying device are sequentially arranged along the second circulation direction.
Optionally, the reversing device comprises a first reversing valve, a second reversing valve, a third reversing valve and a fourth reversing valve, and the output end of the compression device and the input end of the expansion device are alternatively communicated with the first heat exchange device through the first reversing valve; the input end of the compression device and the output end of the expansion device are alternatively communicated with the second heat exchange device through a second reversing valve; the input end of the throttling device and the output end of the first fluid conveying device are alternatively communicated with the first heat exchange device through a third reversing valve, and the output end of the throttling device and the input end of the first fluid conveying device are alternatively communicated with the second heat exchange device through a fourth reversing valve.
Optionally, the first heat exchange pipeline is connected with a first heat storage tank, a second heat storage tank and a second fluid conveying device.
Optionally, the second heat exchange pipeline is connected with a first cold storage tank, a second cold storage tank and a third fluid conveying device.
Optionally, the heat-supplementing device further comprises a heat-supplementing pipeline, wherein the heat-supplementing pipeline is connected with the first heat exchange pipeline, and a heat source is connected to the heat-supplementing pipeline.
Optionally, the device further comprises a carbon trapping device and a carbon dioxide storage device, the heat source is provided with a carbon dioxide discharge port, the carbon trapping device is used for trapping carbon dioxide discharged by the heat source and conveying and storing the carbon dioxide in the carbon dioxide storage device through a pipeline, and the carbon dioxide storage device is connected with the main circulation pipeline through a carbon dioxide supply pipeline.
Optionally, the device further comprises a residual cold recovery pipeline, wherein the residual cold recovery pipeline is connected with the second heat exchange pipeline, and a cold source is connected to the residual cold recovery pipeline.
Optionally, a renewable energy power station is further included, and the renewable energy power station is electrically connected to the compression device.
In another aspect, the invention provides a method for operating an industrial park integrated energy system, which uses any one of the above technical schemes to implement the industrial park integrated energy system, and includes the following steps: charging, namely circularly running the carbon dioxide working medium along a first circulation direction, replacing heat in a carbon dioxide charging circulation pipeline to the first heat exchange pipeline for storage during the process of passing through a first heat exchange device, and performing heat exchange between the second heat exchange pipeline and the carbon dioxide charging circulation pipeline to preheat the carbon dioxide working medium in the carbon dioxide charging circulation pipeline during the process of passing through a second heat exchange device; the power generation and the reversing device are controlled to reverse, the carbon dioxide working medium runs along the second circulating direction, heat in the first heat exchange pipeline is replaced into the carbon dioxide power generation circulating pipeline during the process of passing through the first heat exchange device, and the second heat exchange pipeline and the carbon dioxide power generation circulating pipeline exchange heat during the process of passing through the second heat exchange device, so that the carbon dioxide working medium in the carbon dioxide power generation circulating pipeline is cooled.
The invention has the following advantages:
1. according to the technical scheme, the main circulation pipeline is utilized to realize carbon dioxide charging energy storage and power generation, in the charging circulation, a carbon dioxide working medium circularly operates along a first circulation direction, during the process, when the carbon dioxide passes through the first heat exchange device, heat in the carbon dioxide charging circulation pipeline is replaced into the first heat exchange pipeline to be stored, and when the carbon dioxide passes through the second heat exchange device, the second heat exchange pipeline and the carbon dioxide charging circulation pipeline perform heat exchange, so that the carbon dioxide working medium in the carbon dioxide charging circulation pipeline is preheated; in the power generation cycle, the reversing device is controlled to reverse, the carbon dioxide working medium runs along the second cycle direction, during the process of passing through the first heat exchange device, heat in the first heat exchange pipeline is replaced into the carbon dioxide power generation cycle pipeline, and during the process of passing through the second heat exchange device, the second heat exchange pipeline and the carbon dioxide power generation cycle pipeline exchange heat, so that the carbon dioxide working medium in the carbon dioxide power generation cycle pipeline is cooled, and therefore heat and cold energy are collected and utilized in the carbon dioxide charging and power generation cycle, the waste of energy sources is reduced, and the heat energy utilization rate of the energy storage system is improved.
The industrial park comprehensive energy system provided by the invention takes the Carnot battery as a core, and an energy hub capable of realizing the energy consumption of renewable energy and the utilization of waste heat and residual cold is constructed. Through the reversing device, the switching between the carbon dioxide charging cycle and the carbon dioxide power generation cycle can be realized. Through the utilization of waste heat and residual cold, in the carbon dioxide power generation cycle process, the first heat exchange pipeline is utilized to heat the carbon dioxide working medium, and the second heat exchange pipeline is utilized to cool the carbon dioxide working medium after expansion and working, so that the working temperature difference is effectively improved, and the power generation efficiency is improved. The energy circulation working medium adopts carbon dioxide emissions as working medium to perform carbon neutralization, realizes the recycling of carbon dioxide, ensures that the system has the characteristic of environmental friendliness, and provides a new scene for the absorption of carbon dioxide in the energy storage system.
2. The heat supplementing pipeline is connected with the heat source and can supplement heat for the first heat exchange pipeline, so that heat required in the carbon dioxide charging cycle process is provided. When the heat source utilizes facilities capable of discharging waste heat such as a steel mill, the economy of the facilities such as the steel mill can be improved.
3. Through setting up carbon entrapment device and carbon dioxide storage device, can catch the carbon dioxide of heat source emission to with the carbon dioxide that catches in carbon dioxide storage device, on the one hand can make full use of heat source emission waste gas's energy, on the other hand can supply carbon dioxide for main circulation pipeline, realize the reuse of carbon entrapment product, further promote industrial park comprehensive energy system's efficiency.
4. Through setting up surplus cold recovery pipeline, surplus cold recovery pipeline connection cold source can retrieve the surplus cold of cold source, cools down the heat transfer working medium in the second heat transfer pipeline to can cool down the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline. When the cold source adopts facilities such as a liquefied natural gas station for discharging residual cold, the economy of the facilities such as the liquefied natural gas station can be improved, and the cold source contributes to clean fuel substitution.
5. The compression device is connected with the renewable energy power station, can assist in the digestion of renewable energy, and improves the non-carbon energy duty ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of an industrial park comprehensive energy system according to an embodiment of the present invention.
Reference numerals illustrate:
100. a main circulation line; 1001. a carbon dioxide charge cycle line; 1002. a carbon dioxide power generation circulation pipeline; 200. a first heat exchange line; 300. a second heat exchange line; 400. a heat supplementing pipeline; 500. a residual cold recovery pipeline; 600. a carbon dioxide supply line; 1. a first heat exchange device; 2. a second heat exchange device; 3. a compression device; 4. a throttle device; 5. an expansion device; 6. a first fluid delivery device; 7. a reversing device; 71. a first reversing valve; 72. a second reversing valve; 73. a third reversing valve; 74. a fourth reversing valve; 8. a first heat storage tank; 9. a second heat storage tank; 10. a second fluid delivery device; 20. a first cold storage tank; 30. a second cold storage tank; 40. a third fluid delivery device; 50. a heat source; 60. a carbon capture device; 70. a carbon dioxide storage device; 80. a cold source; 90. renewable energy power stations.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
For the purpose of illustrating the concepts of the invention, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
Example 1
The embodiment provides an industrial park comprehensive energy system, which is realized based on a carbon dioxide Carnot battery (Carnot battery), and the Carnot battery refers to a large-scale electric power energy storage system based on heat storage. Referring to fig. 1, the heat exchanger includes a main circulation line 100, a first heat exchange line 200, and a second heat exchange line 300; the main circulation pipeline 100 is provided with a first heat exchange device 1 and a second heat exchange device 2, the first heat exchange pipeline 200 is connected with the main circulation pipeline 100 in a heat exchange way through the first heat exchange device 1, and the second heat exchange pipeline 300 is connected with the main circulation pipeline 100 in a heat exchange way through the second heat exchange device 2; the main circulation line 100 has a first circulation direction and a second circulation direction which are opposite to each other, and the main circulation line 100 includes a carbon dioxide charging circulation line 1001 running in the first circulation direction and a carbon dioxide power generation circulation line 1002 running in the second circulation direction, and the carbon dioxide charging circulation line 1001 and the carbon dioxide power generation circulation line 1002 are controllably connected by a reversing device 7.
By utilizing the technical scheme of the invention, when the carbon dioxide working medium in the main circulation pipeline 100 runs along the first circulation direction, electric energy is converted into heat energy for storage, so that carbon dioxide charging is realized; when the carbon dioxide working medium in the main circulation pipeline 100 runs along the second circulation direction, the heat energy is converted into electric energy to be reused, and carbon dioxide power generation is realized.
Specifically, in the charging cycle, the carbon dioxide working medium circulates along the first circulation direction, and during the process of passing through the first heat exchange device 1, heat in the carbon dioxide charging cycle pipeline 1001 is replaced to the first heat exchange pipeline 200 for storage; when passing through the second heat exchange device 2, the second heat exchange pipeline 300 and the carbon dioxide charging circulation pipeline 1001 exchange heat, so that the carbon dioxide working medium in the carbon dioxide charging circulation pipeline 1001 is preheated; in the power generation cycle, the reversing device 7 is controlled to reverse, the carbon dioxide working medium runs along the second cycle direction, during the process of passing through the first heat exchange device 1, heat in the first heat exchange pipeline 200 is replaced into the carbon dioxide power generation cycle pipeline 1002, and during the process of passing through the second heat exchange device 2, the second heat exchange pipeline 300 and the carbon dioxide power generation cycle pipeline 1002 exchange heat, so that the carbon dioxide working medium in the carbon dioxide power generation cycle pipeline 1002 is cooled, thereby realizing heat and cold collection and utilization in the carbon dioxide charging and power generation cycle, reducing energy waste and improving the heat energy utilization rate of the energy storage system.
The industrial park comprehensive energy system provided by the invention takes the Carnot battery as a core, an energy hub capable of realizing the consumption of renewable energy and the utilization of waste heat and residual cold is constructed, and the energy hub can be used for storing energy of a power grid, storing redundant power from variable renewable energy and generating power when needed. The energy circulation working medium adopts carbon dioxide emissions as working medium to perform carbon neutralization, realizes the recycling of carbon dioxide, ensures that the system has the characteristic of environmental friendliness, and provides a new scene for the absorption of carbon dioxide in the energy storage system. By providing the reversing device 7, switching between the carbon dioxide charging cycle and the carbon dioxide power generation cycle can be achieved. Meanwhile, by utilizing the waste heat and the residual cold, in the carbon dioxide power generation cycle process, the first heat exchange pipeline 200 is utilized to heat the carbon dioxide working medium, and the second heat exchange pipeline 300 is utilized to cool the carbon dioxide working medium after expansion and working, so that the working temperature difference is effectively improved, and the power generation efficiency is improved.
The first heat exchange device 1 and the second heat exchange device 2 comprise a first channel for circulating a heat exchange working medium and a second channel for circulating a carbon dioxide working medium, and the first channel of the first heat exchange device 1 is connected with a first heat exchange pipeline 200; the first channel of the second heat exchange device 2 is connected to the second heat exchange pipeline 300, and the second channel of the first heat exchange device 1 and the second channel of the second heat exchange device 2 are connected to the main circulation pipeline 100. That is, the carbon dioxide working medium flows through the main circulation line 100, and the heat exchange working medium flows through the first heat exchange line 200 and the second heat exchange line 300. Optionally, the heat exchange medium comprises steam or a mixture of ammonia and water.
Optionally, referring to fig. 1, a compression device 3 and a throttling device 4 are disposed on the carbon dioxide charging circulation line 1001, and the compression device 3, the first heat exchange device 1, the throttling device 4 and the second heat exchange device 2 are sequentially disposed along the first circulation direction. Specifically, in this embodiment, the compression device 3 includes a compressor, and of course, other devices that can implement a gas compression function may also be used. The restriction device 4 comprises a throttle valve capable of performing a restriction expansion of the fluid. By using the compression device 3, the carbon dioxide working medium can be compressed into high-temperature high-pressure gas, when passing through the first heat exchange device 1, heat is replaced into the first heat exchange pipeline 200 for storage, then the heat is throttled and expanded by the throttling device 4 to become low-temperature low-pressure liquid, when passing through the second heat exchange device 2, the second heat exchange pipeline 300 and the carbon dioxide power generation circulation pipeline 1002 perform heat exchange, and the carbon dioxide working medium is preheated and finally returns to the compression device 3 to complete one carbon dioxide charging cycle.
Alternatively, referring to fig. 1, the carbon dioxide power generation cycle 1002 is provided with an expansion device 5 and a first fluid delivery device 6, and the first heat exchange device 1, the expansion device 5, the second heat exchange device 2, and the first fluid delivery device 6 are disposed in this order along the second cycle direction. In particular, in this embodiment, the expansion device 5 includes an expander, and may be any other device capable of implementing a gas expansion function. The first fluid delivery device 6 comprises a delivery pump, and in this embodiment, since the carbon dioxide working fluid is cooled after passing through the second heat exchange device 2, a cryopump is selected for the first fluid delivery device 6. The heat in the first heat exchange pipeline 200 is replaced into the carbon dioxide power generation circulation pipeline 1002 by the first heat exchange device 1, the carbon dioxide working medium is heated, then enters the expansion device 5, the carbon dioxide working medium is expanded by the expansion device 5 to do work and generate power, then passes through the second heat exchange device 2, the second heat exchange pipeline 300 and the carbon dioxide power generation circulation pipeline 1002 perform heat exchange, the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline 1002 is cooled, is conveyed by the first fluid conveying device 6, and passes through the first heat exchange device 1 again, so that one carbon dioxide power generation cycle is completed.
Optionally, referring to fig. 1, the reversing device 7 includes a first reversing valve 71, a second reversing valve 72, a third reversing valve 73 and a fourth reversing valve 74, and the output end of the compression device 3 and the input end of the expansion device 5 are alternatively communicated with the first interface of the first heat exchange device 1 through the first reversing valve 71; the input end of the compression device 3 and the output end of the expansion device 5 are alternatively communicated with the first interface of the second heat exchange device 2 through a second reversing valve 72; the input of the throttle device 4 and the output of the first fluid transfer device 6 are connected alternatively to the second connection of the first heat exchange device 1 via a third reversing valve 73, and the output of the throttle device 4 and the input of the first fluid transfer device 6 are connected alternatively to the second connection of the second heat exchange device 2 via a fourth reversing valve 74.
Specifically, when the first reversing valve 71 communicates the output end of the compression device 3 with the first heat exchange device 1, the third reversing valve 73 communicates the first heat exchange device 1 with the input end of the throttling device 4, the fourth reversing valve 74 communicates the output end of the throttling device 4 with the second heat exchange device 2, and the second reversing valve 72 communicates the output end of the second heat exchange device 2 with the input end of the compression device 3, the carbon dioxide charging circulation line 1001 is in communication. The carbon dioxide working medium can be charged by circulating in the first circulation direction, i.e. clockwise in fig. 1.
When the first reversing valve 71 communicates the first heat exchange device 1 with the input end of the expansion device 5, the second reversing valve 72 communicates the output end of the expansion device 5 with the second heat exchange device 2, the fourth reversing valve 74 communicates the second heat exchange device 2 with the input end of the first fluid transport device 6, and the third reversing valve 73 communicates the output end of the first fluid transport device 6 with the first heat exchange device 1, the carbon dioxide generation circulation line 1002 is then communicated. The cyclic operation in the second cycle direction, i.e., counterclockwise in fig. 1, enables the generation of electricity of carbon dioxide. Specifically, in the present embodiment, the first reversing valve 71, the second reversing valve 72, the third reversing valve 73, and the fourth reversing valve 74 are three-way valves.
Specifically, the above-mentioned "in communication with the first heat exchange device 1" means in communication with the second passage of the first heat exchange device 1, and similarly, the above-mentioned "in communication with the second heat exchange device 2" means in communication with the second passage of the second heat exchange device 2.
Optionally, the first heat exchange pipeline 200 is connected with a first heat storage tank 8, a second heat storage tank 9 and a second fluid conveying device 10. Specifically, the first heat storage tank 8 is a high temperature tank, and the second heat storage tank 9 is a low temperature tank, that is, the temperature of the first heat storage tank 8 is greater than the temperature of the second heat storage tank 9. In the carbon dioxide charging cycle, heat is stored in the second heat storage tank 9 and then transferred to the first heat storage tank 8. In the carbon dioxide power generation cycle, the heat exchange working medium flows into the first heat exchange device 1 from the first heat storage tank 8, performs heat exchange with the carbon dioxide working medium, and after heat exchange, the temperature of the heat exchange working medium is reduced and flows into the second heat storage tank 9. In the first heat exchange line 200, the flow of the heat exchange medium is powered by the second fluid transfer device 10.
Optionally, the second heat exchange pipeline 300 is connected with the first cold storage tank 20, the second cold storage tank 30 and the third fluid conveying device 40. Specifically, the first cold storage tank 20 is a low temperature tank, and the second cold storage tank 30 is a high temperature tank, i.e., the temperature of the first cold storage tank 20 is less than the temperature of the second cold storage tank 30. In the carbon dioxide charging cycle, the cold energy is stored in the second cold storage tank 30 and then transferred to the first cold storage tank 20. In the carbon dioxide power generation cycle, the heat exchange working medium flows from the first cold storage tank 20 to the second heat exchange device 2, and after heat exchange with the carbon dioxide working medium, the temperature of the heat exchange working medium rises and flows into the second cold storage tank 30. In the second heat exchange line 300, the third fluid transfer device 40 provides motive force for the flow of the heat exchange medium.
Alternatively, the cycle of the residual heat and the residual heat may take the form of a rankine cycle, a Kalina cycle, or a delta flash cycle.
Optionally, referring to fig. 1, the heat supplementing pipeline 400 is further included, the heat supplementing pipeline 400 is connected with the first heat exchange pipeline 200, and the heat source 50 is connected to the heat supplementing pipeline 400. Specifically, the heat compensation line 400 connects the heat source 50 and the first heat storage tank 8 to form a heat compensation circulation circuit. When the temperature in first heat storage tank 8 is lower than the required temperature, the heat in heat source 50 is supplied into first heat storage tank 8 by way of heat supply line 400. The heat of the heat source 50 is supplied to the first heat storage tank 8, also in the form of heat exchange. In this embodiment, the heat source 50 comprises a steel plant, although the steel plant may be replaced by a collection of one or more industrial facilities capable of providing waste heat, such as a chemical plant.
By providing the heat compensating pipe 400, the heat compensating pipe 400 is connected to the heat source 50, and can supplement heat to the first heat exchanging pipe 200, thereby providing heat required during the carbon dioxide charging cycle. When the heat source 50 uses facilities such as a steelworks that can discharge waste heat, the economy of the facilities such as steelworks can be improved.
Optionally, referring to fig. 1, further comprising a carbon capture device 60 and a carbon dioxide storage device 70, the heat source 50 has a carbon dioxide discharge port, the carbon capture device 60 is used for capturing carbon dioxide discharged from the heat source 50, and delivering and storing the carbon dioxide in the carbon dioxide storage device 70 through a pipeline, and the carbon dioxide storage device 70 is connected to the main circulation pipeline 100 through a carbon dioxide supply pipeline 600. In particular, the steel mill may also be replaced by a collection of one or more industrial facilities that provide both waste heat and carbon dioxide containing waste gas.
Through setting up carbon capture device 60 and carbon dioxide storage device 70, can catch the carbon dioxide of heat source 50 emission to with the carbon dioxide that catches in carbon dioxide storage device 70, on the one hand can make full use of the energy of heat source 50 emission waste gas, on the other hand can supply carbon dioxide working medium for main circulation pipeline 100, realize the reuse of carbon capture product, further promote the efficiency of industrial park comprehensive energy system.
Optionally, referring to fig. 1, the system further includes a residual cold recovery pipeline 500, the residual cold recovery pipeline 500 is connected to the second heat exchange pipeline 300, and the cold source 80 is connected to the residual cold recovery pipeline 500. Specifically, the residual heat recovery line 500 connects the heat sink 80 and the first heat storage tank 20 to form a supplementary cooling circulation loop. When the temperature in the first cold storage tank 20 is higher than the required temperature, the residual cold in the cold source 80 is recovered by the residual cold recovery line 500 and supplied into the first cold storage tank 20. The residual cold of the cold source 80 is fed to the first cold storage tank 20, also in the form of heat exchange. In this embodiment, cold source 80 comprises a lng plant, although the lng plant may be replaced by a facility capable of providing excess cooling, including an air separation plant.
Through setting up surplus cold recovery pipeline 500, surplus cold recovery pipeline 500 connects cold source 80, can retrieve the surplus cold of cold source 80, cools down the heat transfer working medium in the second heat transfer pipeline 300 to can cool down the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline. When the cold source 80 adopts facilities for discharging surplus cold, such as a lng plant, it is possible to enhance the economy of facilities such as a lng plant and to contribute to clean fuel substitution.
Optionally, a renewable energy power station 90 is further included, and the renewable energy power station 90 is electrically connected to the compression device 3. Renewable energy power station 90 includes, but is not limited to, photovoltaic, photo-thermal power generation, hydro-power generation, and wind power.
The compression device 3 is connected with the renewable energy power station 90, so that renewable energy can be consumed in an auxiliary mode, and the non-carbon energy duty ratio is improved.
Example 2
A method for operating an industrial park integrated energy system using the industrial park integrated energy system of embodiment 1, comprising the steps of: charging, namely circulating the carbon dioxide working medium along a first circulating direction, and replacing heat in a carbon dioxide charging circulating pipeline 1001 to a first heat exchange pipeline 200 for storage during the process of passing through a first heat exchange device 1, and performing heat exchange between a second heat exchange pipeline 300 and the carbon dioxide charging circulating pipeline 1001 to preheat the carbon dioxide working medium in the carbon dioxide charging circulating pipeline 1001 during the process of passing through a second heat exchange device 2; the reversing device 7 is controlled to reverse, the carbon dioxide working medium runs along the second circulation direction, heat in the first heat exchange pipeline 200 is replaced into the carbon dioxide power generation circulation pipeline 1002 during the process of passing through the first heat exchange device 1, and the second heat exchange pipeline 300 and the carbon dioxide power generation circulation pipeline 1002 exchange heat during the process of passing through the second heat exchange device 2, so that the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline 1002 is cooled.
Specifically, in the carbon dioxide charging cycle, a carbon dioxide charging cycle pipeline 1001 is started, a carbon dioxide working medium sequentially passes through a compression device 3, a first heat exchange device 1, a throttling device 4 and a second heat exchange device 2 along a first cycle direction, and finally returns to the compression device 3, the carbon dioxide working medium is stored in the first heat exchange pipeline 200 by replacing heat by the first heat exchange device 1 when passing through the first heat exchange device 1, and the second heat exchange device 2 replaces heat in the second heat exchange pipeline 300 to the carbon dioxide power generation cycle pipeline 1002 to preheat the carbon dioxide working medium when the carbon dioxide working medium passes through the second heat exchange device 2;
in the carbon dioxide power generation cycle, the reversing device 7 is controlled to reverse, the carbon dioxide charging circulation pipeline 1001 is closed, the carbon dioxide power generation circulation pipeline 1002 is started, the carbon dioxide working medium sequentially passes through the second heat exchange device 2, the expansion device 5, the second heat exchange device 2 and the fluid conveying device along the second circulation direction, the heat in the first heat exchange pipeline 200 is replaced by the first heat exchange device 1 to heat the carbon dioxide working medium when the carbon dioxide working medium passes through the first heat exchange device 1, then the carbon dioxide working medium enters the expansion device 5 to expand and do work to generate power, the second heat exchange device 2 enables the second heat exchange pipeline 300 and the carbon dioxide power generation circulation pipeline 1002 to perform heat exchange when the carbon dioxide working medium passes through the second heat exchange device 2, the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline 1002 is cooled, and then the fluid conveying device is conveyed to the first heat exchange device 1 to complete one-time circulation.
The industrial park integrated energy system can be switched between two main modes of operation depending on the energy demand within the industrial park. Meanwhile, according to the running states of other facilities in the park, the two secondary running modes of waste heat recovery and waste cold recovery of the comprehensive energy system of the industrial park can be started and stopped respectively, and the limitation of switching of the main running modes is avoided.
According to the above description, the present patent application has the following advantages:
1. in the carbon dioxide charging cycle process, the first heat exchange pipeline 200 and the second heat exchange pipeline 300 can collect and utilize heat and cold in the carbon dioxide charging cycle, so that the waste of energy sources is reduced, and the heat energy utilization rate of the energy storage system is improved; the renewable energy source can be realized; in the carbon dioxide power generation cycle process, the first heat exchange pipeline 200 and the second heat exchange pipeline 300 effectively improve the acting temperature difference, and improve the power generation efficiency;
2. the first heat exchange line 200 can be supplemented with heat to provide the heat required during the carbon dioxide charging cycle; when the heat source 50 utilizes facilities capable of discharging waste heat such as a steelworks, the economy of the facilities such as steelworks can be improved;
3. carbon dioxide discharged by the heat source 50 can be captured, the captured carbon dioxide is stored in the carbon dioxide storage device 70, the energy of waste gas discharged by the heat source 50 can be fully utilized, and meanwhile, carbon dioxide working medium is supplied to the main circulation pipeline 100, so that the reutilization of carbon capture products is realized, and the efficiency of an industrial park comprehensive energy system is further improved;
4. the residual cold recovery pipeline 500 can recover the residual cold of the cold source 80 and cool the heat exchange working medium in the second heat exchange pipeline 300, so that the carbon dioxide working medium can be cooled in the carbon dioxide power generation cycle process; when the cold source 80 adopts facilities such as a liquefied natural gas station for discharging residual cold, the economy of the facilities such as the liquefied natural gas station can be improved, and the contribution is made to clean fuel substitution;
5. the compression device 3 is connected with the renewable energy power station 90, so that renewable energy can be consumed in an auxiliary mode, and the non-carbon energy duty ratio is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (6)
1. An industrial park comprehensive energy system is characterized by comprising a main circulation pipeline (100), a first heat exchange pipeline (200) and a second heat exchange pipeline (300);
the main circulation pipeline (100) is provided with a first heat exchange device (1) and a second heat exchange device (2), the first heat exchange pipeline (200) is connected with the main circulation pipeline (100) in a heat exchange way through the first heat exchange device (1), and the second heat exchange pipeline (300) is connected with the main circulation pipeline (100) in a heat exchange way through the second heat exchange device (2);
the main circulation pipeline (100) has a first circulation direction and a second circulation direction which are opposite to each other, the main circulation pipeline (100) comprises a carbon dioxide charging circulation pipeline (1001) running along the first circulation direction and a carbon dioxide power generation circulation pipeline (1002) running along the second circulation direction, and the carbon dioxide charging circulation pipeline (1001) and the carbon dioxide power generation circulation pipeline (1002) are controllably connected through a reversing device (7);
the first heat exchange pipeline (200) is connected with a first heat storage tank (8), a second heat storage tank (9) and a second fluid conveying device (10); the second heat exchange pipeline (300) is connected with a first cold storage tank (20), a second cold storage tank (30) and a third fluid conveying device (40);
the heat exchange system further comprises a heat supplementing pipeline (400), wherein the heat supplementing pipeline (400) is connected with the first heat exchange pipeline (200), and a heat source (50) is connected to the heat supplementing pipeline (400);
the device also comprises a carbon capture device (60) and a carbon dioxide storage device (70), wherein the heat source (50) is provided with a carbon dioxide discharge port, the carbon capture device (60) is used for capturing carbon dioxide discharged by the heat source (50) and conveying and storing the carbon dioxide into the carbon dioxide storage device (70) through a pipeline, and the carbon dioxide storage device (70) is connected with the main circulation pipeline (100) through a carbon dioxide supply pipeline (600);
the cold recovery device further comprises a residual cold recovery pipeline (500), wherein the residual cold recovery pipeline (500) is connected with the second heat exchange pipeline (300), and a cold source (80) is connected to the residual cold recovery pipeline (500).
2. The industrial park comprehensive energy system according to claim 1, wherein the carbon dioxide charging circulation pipeline (1001) is provided with a compression device (3) and a throttling device (4), and the compression device (3), the first heat exchange device (1), the throttling device (4) and the second heat exchange device (2) are sequentially arranged along the first circulation direction.
3. The industrial park comprehensive energy system according to claim 2, wherein the carbon dioxide power generation circulation pipeline (1002) is provided with an expansion device (5) and a first fluid conveying device (6), and the first heat exchange device (1), the expansion device (5), the second heat exchange device (2) and the first fluid conveying device (6) are sequentially arranged along the second circulation direction.
4. An industrial park integrated energy system according to claim 3, wherein the reversing device (7) comprises a first reversing valve (71), a second reversing valve (72), a third reversing valve (73) and a fourth reversing valve (74), the output of the compression device (3) and the input of the expansion device (5) being in alternative communication with the first heat exchange device (1) via the first reversing valve (71); the input end of the compression device (3) and the output end of the expansion device (5) are alternatively communicated with the second heat exchange device (2) through the second reversing valve (72); the input end of the throttling device (4) and the output end of the first fluid conveying device (6) are alternatively communicated with the first heat exchange device (1) through the third reversing valve (73), and the output end of the throttling device (4) and the input end of the first fluid conveying device (6) are alternatively communicated with the second heat exchange device (2) through the fourth reversing valve (74).
5. The industrial park integrated energy system according to any of claims 2-4, further comprising a renewable energy power station (90), wherein the renewable energy power station (90) is electrically connected to the compression device (3).
6. A method of operating an industrial park integrated energy system, characterized by using the industrial park integrated energy system of any one of claims 1-5, comprising the steps of:
charging, namely circulating the carbon dioxide working medium along a first circulating direction, replacing heat in a carbon dioxide charging circulating pipeline (1001) to a first heat exchange pipeline (200) for storage during the process of passing through a first heat exchange device (1), and carrying out heat exchange between a second heat exchange pipeline (300) and the carbon dioxide charging circulating pipeline (1001) to preheat the carbon dioxide working medium in the carbon dioxide charging circulating pipeline (1001) during the process of passing through a second heat exchange device (2);
and when the carbon dioxide passes through the second heat exchange device (2), the second heat exchange pipeline (300) and the carbon dioxide power generation circulation pipeline (1002) exchange heat, and the carbon dioxide working medium in the carbon dioxide power generation circulation pipeline (1002) is cooled.
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| CN114033518A (en) * | 2021-10-27 | 2022-02-11 | 中国长江三峡集团有限公司 | Comprehensive energy system based on carbon dioxide Carnot battery and operation method |
| CN114109524A (en) * | 2021-10-27 | 2022-03-01 | 中国长江三峡集团有限公司 | Carbon dioxide Carnot battery-based cold-heat-electricity-water combined supply system and operation method |
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