CN219081667U - Carnot battery energy storage and CO2 super-transcritical power cycle combined power generation system - Google Patents
Carnot battery energy storage and CO2 super-transcritical power cycle combined power generation system Download PDFInfo
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Abstract
The utility model provides a Carnot battery energy storage and CO 2 The ultra-transcritical power cycle combined power generation system comprises a canola battery heat storage system and supercritical CO 2 Power cycle system and transcritical CO 2 A power circulation system; the heat storage system of the Carnot battery comprises a heat exchanger I, a compressor I, a phase change material heat storage tank and an expansion valve; the supercriticalCO 2 The power circulation system comprises a high-temperature heater, a low-temperature heater, an expansion generator I, a heat regenerator I, an intermediate heat exchanger, a gas cooler and a compressor II; the trans-critical CO 2 The power circulation system comprises an expansion generator II, a condenser and a working medium pump. The technical scheme of the utility model can solve the problems of large-scale heat energy storage, waste heat recovery, comprehensive energy utilization, power generation and the like.
Description
Technical Field
The utility model relates to the technical field of engineering thermophysics, in particular to a Carnot battery energy storage and CO 2 A combined power generation system for ultra-transcritical power cycle.
Background
A canola cell is a currently very promising energy storage technology, in which electrical energy is stored in the form of thermal energy and then recovered during discharge. Charging may be accomplished by different heating techniques, while discharging may be accomplished by different thermal engine techniques. In a carnot cell, electrical energy (input) is used to establish a temperature difference between two environments, i.e., a low temperature thermal storage layer and a high temperature thermal storage layer. In this way the energy storage is charged and the electrical energy is stored as heat
When heat flows against the temperature gradient, the carnot battery is in a charged condition. During the discharge phase, heat->
The heat is transferred from the high-temperature heat storage layer to the low-temperature heat storage layer and discharged. The heat flow provides power for the heat engine, the latter converts the heat engine into work, waste heat is discharged into the low-temperature heat storage layer, and finally the work of the heat engine is utilized to regenerate electric energy. Depending on the different thermodynamic cycles employed during charge and discharge, such as rankine cycle, transcritical carbon dioxide cycle, brayton cycle, etc.
CO 2 Supercritical cycles were used at the beginning of the proposal to overcome the temperature limitations of steam rankine and joule-brayton cycles and are applied to nuclear reactors and solar-thermal conversion devices. In recent years, with the continuous development of research, the device has the advantages of high efficiency, small equipment volume, low capital cost and safe and stable working mediumAnd the like, and research and application begin in the field of waste heat recovery. CO 2 The critical temperature is 31.1 ℃, the critical pressure is 7.38MPa, and the supercritical state is easy to realize. And CO 2 Is a natural working medium, is nontoxic and harmless, and is environment-friendly; compared with the steam Rankine cycle, the heat source temperature is higher than 820K, and the heat source temperature control system has the advantages of high heat efficiency, compact system and simple structure. To increase the overall heat recovery efficiency of the supercritical carbon dioxide cycle, the system thermal efficiency, e.g., transcritical CO, can also be increased by adding a low temperature drive bottoming cycle 2 Recycle, useful for further recovery of SCO 2 The power cycle discharges heat.
At present, research on the Carnot battery at home and abroad mainly focuses on structure and performance optimization, but the combination of the Carnot battery and the waste heat cascade recycling technology is relatively less, and as the waste heat recovery has uncertainty and discontinuity, when the system has electricity demand, the waste heat recovery can not always generate corresponding electric energy supply in time, and a large-scale energy storage system is required to be coupled with the high-temperature waste heat cascade recycling technology. At the same time for CO 2 The combined power generation and energy storage system coupling of the supercritical power cycle has less application.
Disclosure of Invention
According to the proposed technology, the combination of the Carnot battery and the waste heat cascade recycling technology is relatively less, and the technology is applicable to CO 2 The technical problem of less application of coupling of the combined power generation and energy storage system of the supercritical power cycle is solved, and the Carnot battery energy storage and CO is provided 2 A combined power generation system for ultra-transcritical power cycle. The utility model mainly uses the Carnot battery energy storage system and supercritical CO 2 Power cycle system and transcritical CO 2 The power circulation system is coupled, and high-temperature waste heat and heat storage and supercritical CO of the Carnot battery are fully utilized 2 Waste heat of the system forms a Carnot battery energy storage and CO 2 A combined power generation system for ultra-transcritical power cycle.
The utility model adopts the following technical means:
carnot battery energy storage and CO 2 Combined generation of super-transcritical power cycleAn electrical system, comprising: carnot battery heat storage system and supercritical CO 2 Power cycle system and transcritical CO 2 A power circulation system; the heat storage system of the Carnot battery and supercritical CO 2 The power circulation system is connected and used for storing industrial waste heat and releasing heat energy into supercritical CO when the system has power demand 2 The power circulation system provides a heat source, the supercritical CO 2 Power circulation system and transcritical CO 2 The power circulation system is connected for generating electricity and is transcritical CO 2 The power cycle system provides a source of heat, the transcritical CO 2 The power circulation system is used for generating electricity.
Further, the carnot battery heat storage system comprises a heat exchanger, a compressor I, a phase change heat storage tank and an expansion valve, wherein an outlet of the heat exchanger is connected with an inlet of the compressor I, an outlet of the compressor I is connected with a heat storage inlet of the phase change heat storage tank, a heat storage outlet of the phase change heat storage tank is connected with an inlet of the expansion valve, and an outlet of the expansion valve is connected with an inlet of the heat exchanger; the phase change heat storage tank and the supercritical CO 2 The power circulation system is connected.
Further, the supercritical CO 2 The power circulation system comprises a high-temperature heater, a low-temperature heater, an expansion generator I, a heat regenerator I, an intermediate heat exchanger, a gas cooler and a compressor II, wherein a heat release outlet of the phase-change heat storage tank is connected with a high-temperature end inlet of the high-temperature heater, a high-temperature end outlet of the high-temperature heater is connected with a high-temperature end inlet of the low-temperature heater, and a high-temperature end outlet of the low-temperature heater is connected with a heat release inlet of the phase-change heat storage tank; the outlet of the compressor II is connected with the low-temperature end inlet of the low-temperature heater and the cold side inlet of the heat regenerator I; the cold side outlet of the heat regenerator I is connected with the low temperature end inlet of the high temperature heater; the low-temperature end outlet of the low-temperature heater is connected with the low-temperature end inlet of the high-temperature heater, the low-temperature end outlet of the high-temperature heater is connected with the inlet of the expansion generator I, the inlet of the expansion generator I is connected with the hot side inlet of the heat regenerator I, and the hot side of the heat regenerator I is dischargedThe port is connected with the inlet of the intermediate heat exchanger, the outlet of the intermediate heat exchanger is connected with the inlet of the gas cooler, and the outlet of the gas cooler is connected with the inlet of the compressor II;
the supercritical CO 2 The power circulation system is connected with the transcritical CO through an intermediate heat exchanger 2 The power circulation system is connected;
the heat energy of the outlet of the compressor I is stored in the phase change heat storage tank, when the system has electricity demand, the heat energy of the phase change heat storage tank is transmitted to the high-temperature heater and the low-temperature heater through exothermic working media to serve as heat sources, and the heat sources are the supercritical CO through the high-temperature heater 2 CO in a power cycle system 2 The circulating medium provides thermal energy.
Further, the transcritical CO 2 The power circulation system comprises an expansion generator II, a condenser and a working medium pump, wherein an outlet of the expansion generator II is connected with an inlet of the condenser, an outlet of the condenser is connected with an inlet of the working medium pump, an outlet of the working medium pump is connected with a low-temperature end inlet of the intermediate heat exchanger, and a low-temperature end outlet of the intermediate heat exchanger is connected with an inlet of the expansion generator II; the intermediate heat exchanger is composed of low-temperature supercritical CO from the heat regenerator I 2 As a heat source, the heat source is the transcritical CO through the intermediate heat exchanger 2 CO in a power cycle system 2 The circulating working medium provides heat energy.
Further, the supercritical CO 2 The power cycle system can also be used as the top cycle of the heat storage system of the Carnot battery, and the transcritical CO 2 The power circulation system is used as the bottom circulation of the heat storage system of the Carnot battery, wherein the high-temperature heater and the low-temperature heater are disconnected with the phase-change heat storage tank, the heat regenerator I is disconnected with the intermediate heat exchanger, and the intermediate heat exchanger is disconnected with the gas cooler;
the high-temperature end outlet of the heat regenerator I is connected with the high-temperature end inlet of the heat exchanger, the high-temperature end inlet of the heat exchanger is connected with the inlet of the gas cooler, the outlet of the expansion valve is connected with the low-temperature end inlet of the heat exchanger, and the low-temperature end inlet of the heat exchanger is connected with the inlet of the compressor I;
the heat release outlet of the phase change heat storage tank is connected with the high-temperature end inlet of the intermediate heat exchanger, the high-temperature end outlet of the intermediate heat exchanger is connected with the heat release inlet of the phase change heat storage tank, the outlet of the working medium pump is connected with the low-temperature end inlet of the intermediate heat exchanger, and the low-temperature end outlet of the intermediate heat exchanger is connected with the inlet of the expansion generator II.
Further, the carnot battery energy storage system further comprises a heat regenerator II, a high-temperature end outlet of the heat regenerator II is connected with an inlet of the expansion valve, an outlet of the phase change heat storage tank is connected with a high-temperature end inlet of the heat regenerator II, a low-temperature end outlet of the heat regenerator II is connected with an inlet of the compressor I, and an outlet of the heat exchanger is connected with a low-temperature end inlet of the heat regenerator II.
Further, the transcritical CO 2 The power circulation system further comprises a heat regenerator III, a high-temperature end outlet of the heat regenerator III is connected with a low-temperature end inlet of the intermediate heat exchanger, an outlet of the expansion generator II is connected with the low-temperature end inlet of the heat regenerator III, and a low-temperature end outlet of the heat regenerator III is connected with an inlet of the condenser.
Further, the cooling medium of the gas cooler and the condenser may be circulating cooling water, and the phase-change heat storage medium in the phase-change heat storage tank may be inorganic salt high-temperature phase-change heat storage material.
Compared with the prior art, the utility model has the following advantages:
1. the Carnot battery provided by the utility model stores energy and CO 2 The combined power generation system of the ultra-trans critical power cycle fully utilizes the waste heat to store energy efficiently, realizes the gradient utilization of the high-temperature waste heat, and solves the problem of unbalanced supply and demand of waste heat power generation.
2. The Carnot battery provided by the utility model stores energy and CO 2 Combined power generation system of super-trans critical power cycle, supercritical CO is carried out through intermediate heat exchanger 2 Power cycle and spanCritical CO 2 The power cycle is coupled, so that the system is more compact and the supercritical CO is further recovered 2 Working medium waste heat before entering the gas cooler in the power cycle.
3. The Carnot battery provided by the utility model stores energy and CO 2 Combined power generation system of super-transcritical power cycle, in regenerative supercritical CO 2 The bottom circulation is added on the basis of circulation, so that the low-temperature waste heat can be fully utilized on the basis of reducing irreversible loss of the heat regenerator.
In conclusion, the technical scheme of the utility model can solve the problem of comprehensive energy utilization of low-cost large-scale energy storage and waste heat cascade recovery.
For the reasons, the utility model is not limited by regions and can be widely popularized in industrial systems with fully high-temperature waste heat.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a block diagram of a combined power generation system according to embodiment 1 of the present utility model.
Fig. 2 is a block diagram of a combined power generation system according to embodiment 2 of the present utility model.
Fig. 3 is a block diagram of a combined power generation system according to embodiment 3 of the present utility model.
In the figure: 1. a heat exchanger; 2. a compressor I; 3. a phase change heat storage tank; 4. an expansion valve; 5. a high temperature heater; 6. a low temperature heater; 7. an expansion generator I; 8. a heat regenerator I; 9. an intermediate heat exchanger; 10. a gas cooler; 11. a compressor II; 12. an expansion generator II; 13. a condenser; 14. a working medium pump; 15. a heat regenerator II; 16. regenerator III.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to solve the problem of low-cost large-scale energy storage and waste heat cascade recovery comprehensive energy utilization, the utility model provides a Carnot battery energy storage and CO 2 The combined power generation system of the super-transcritical power cycle comprises a canola battery heat storage system and a supercritical CO 2 Power cycle system and transcritical CO 2 A power circulation system. By integrating a Carnot battery energy storage system and supercritical CO 2 Power cycle system and transcritical CO 2 The power circulation system is coupled, and the high-temperature waste heat and the heat storage system of the Carnot battery and the supercritical CO are fully utilized 2 Waste heat of power circulation system to form a Carnot battery energy storage and CO 2 A combined power generation system of a supercritical power cycle.
The canola battery heat storage system comprises a heat exchanger 1, a compressor I2, a phase change heat storage tank 3 and an expansion valve 4; the outlet of the heat exchanger 1 is connected to the inlet of the compressor 2, the outlet of the compressor 2 is connected to the heat storage inlet of the phase change heat storage tank 3, the heat storage outlet of the phase change heat storage tank 3 is connected to the inlet of the expansion valve 4, and the outlet of the expansion valve 4 is connected to the inlet of the heat exchanger 1.
The supercritical CO 2 The power circulation system comprises a high-temperature heater 5, a low-temperature heater 6, an expansion generator I7, a heat regenerator I8, an intermediate heat exchanger 9, a gas cooler 10 and a compressor II 11; the heat release outlet of the phase change heat storage tank 3 is connected to the high temperature end inlet of the high temperature heater 5, the high temperature end outlet of the high temperature heater 5 is connected to the high temperature end inlet of the low temperature heater 6, and the high temperature end outlet of the low temperature heater 6 is connected to the phase change heat storage tank 3A heat release inlet; the outlet of the compressor II 11 is connected to the low-temperature end inlet of the low-temperature heater 6 and the cold-side inlet of the regenerator I8; the cold side outlet of the heat regenerator I8 is connected with the low temperature end inlet of the high temperature heater 5; the low temperature end outlet of low temperature heater 6 is connected the low temperature end entry of high temperature heater 5, the low temperature end outlet connection of high temperature heater 5 the entry of expansion generator I7, the entry connection of expansion generator I7 the hot side entry of regenerator I8, the hot side exit linkage of regenerator I8 the entry of intermediate heat exchanger 9, the exit linkage of intermediate heat exchanger 9 the entry of gas cooler 10, the exit linkage of gas cooler 10 the entry of compressor II 11.
The trans-critical CO 2 The power circulation system comprises an expansion generator II 12, a condenser 13 and a working medium pump 14; the outlet of the expansion generator II 12 is connected to the inlet of the condenser 13, the outlet of the condenser 13 is connected to the inlet of the working medium pump 14, the outlet of the working medium pump 14 is connected to the low-temperature end inlet of the intermediate heat exchanger 9, and the low-temperature end outlet of the intermediate heat exchanger 9 is connected to the inlet of the expansion generator II 12.
Preferably, the thermal energy of the outlet of the carnot cell compressor 2 is stored in the phase change thermal storage tank 3; when the system has electricity demand, the phase change heat storage tank 3 releases heat energy into the high-temperature heater 5 and the low-temperature heater 6 through exothermic circulation working media.
Preferably, the cooling medium of the gas cooler 10 and the condenser 13 may be circulating cooling water, and the phase-change heat storage medium in the phase-change heat storage tank 3 may be inorganic salt high-temperature phase-change heat storage material.
Preferably, the heat energy of the phase change heat storage tank 3 is transferred to the high-temperature heater 5 and the low-temperature heater 6 through exothermic working media to be used as heat sources, and the heat sources are the supercritical CO through the high-temperature heater 5 2 CO in a power cycle system 2 The circulating medium provides heat energy; the intermediate heat exchanger 9 is composed of the low-temperature supercritical CO from the heat regenerator I8 2 As a heat source, the heat source passes through the intermediate heat exchanger9 is the trans-critical CO 2 CO in a power cycle system 2 The circulating working medium provides heat energy.
Preferably, the carnot battery energy storage system further comprises a regenerator ii 15, a high temperature end outlet of the regenerator ii 15 is connected to an inlet of the expansion valve 4, an outlet of the phase change heat storage tank 3 is connected to a high temperature end inlet of the regenerator ii 15, a low temperature end outlet of the regenerator ii 15 is connected to an inlet of the compressor i 2, and an outlet of the heat exchanger 1 is connected to a low temperature end inlet of the regenerator ii 15.
Preferably, the transcritical CO 2 The power cycle system further comprises a regenerator III 16, wherein the high temperature end outlet of the regenerator III 16 is connected to the low temperature end inlet of the intermediate heat exchanger 9, the outlet of the expansion generator II 12 is connected to the low temperature end inlet of the regenerator III 16, and the low temperature end outlet of the regenerator III 16 is connected to the inlet of the condenser 13.
Preferably, the supercritical CO 2 The power cycle can be used as both the top cycle and the bottom cycle of the canola battery thermal storage system.
Preferably, the outlet of the high temperature end of the regenerator I8 is connected with the inlet of the high temperature end of the heat exchanger 1, the inlet of the high temperature end of the heat exchanger 1 is connected with the inlet of the gas cooler 10, the outlet of the expansion valve 4 is connected with the inlet of the low temperature end of the heat exchanger 1, and the inlet of the low temperature end of the heat exchanger 1 is connected with the inlet of the compressor I2; the heat release outlet of the phase change heat storage tank 3 is connected to the high temperature end inlet of the intermediate heat exchanger 9, the high temperature end outlet of the intermediate heat exchanger 9 is connected to the heat release inlet of the phase change heat storage tank 3, the outlet of the working medium pump 14 is connected to the low temperature end inlet of the intermediate heat exchanger 9, and the low temperature end outlet of the intermediate heat exchanger 9 is connected to the inlet of the expansion generator II 12.
Example 1
As shown in FIG. 1, the utility model provides a Carnot battery energy storage and CO 2 Combined power generation system of supercritical power cycle, which stores high-temperature industrial waste heat by using Carnot battery, and releases the waste heat when the system has power demandHeat release energy as supercritical CO 2 High temperature heat source of power circulation system and supercritical CO 2 CO recycle regenerator outlet 2 Working medium as trans-critical CO 2 And a high-temperature heat source of the power circulation system.
The combined power generation system comprises a Kano battery heat storage system, a supercritical carbon dioxide power circulation system and a transcritical carbon dioxide power circulation system.
The canola battery heat storage system comprises a heat exchanger 1, a compressor I2, a phase change heat storage tank 3 and an expansion valve 4; the outlet of the heat exchanger 1 is connected to the inlet of the compressor I2, the outlet of the compressor I2 is connected to the heat storage inlet of the phase change heat storage tank 3, the heat storage outlet of the phase change heat storage tank 3 is connected to the inlet of the expansion valve 4, and the outlet of the expansion valve 4 is connected to the inlet of the heat exchanger 1.
In the canola battery heat storage system, liquid working medium absorbs heat and evaporates into gas through a heat exchanger 1, the gas is pressurized into high-temperature high-pressure gas in a compressor 2, then the high-temperature high-pressure gas enters a heat storage inlet of a phase change heat storage tank 3, and high-temperature heat is stored in the phase change heat storage tank 3; the heat storage working medium of the Carnot battery after heat release enters an expansion valve 4 from a heat storage outlet of a phase change heat storage tank 3, and is throttled and depressurized to become saturated liquid working medium which enters the heat exchanger 1 again to absorb high-temperature industrial waste heat.
The supercritical CO 2 The power circulation system comprises a high-temperature heater 5, a low-temperature heater 6, an expansion generator I7, a heat regenerator I8, an intermediate heat exchanger 9, a gas cooler 10 and a compressor II 11; the heat release outlet of the phase change heat storage tank 3 is connected to the high temperature end inlet of the high temperature heater 5, the high temperature end outlet of the high temperature heater 5 is connected to the high temperature end inlet of the low temperature heater 6, and the high temperature end outlet of the low temperature heater 6 is connected to the heat release inlet of the phase change heat storage tank 3; the outlet of the compressor II 11 is connected to the low-temperature end inlet of the low-temperature heater 6 and the cold-side inlet of the regenerator I8; the cold side outlet of the heat regenerator I8 is connected with the low temperature end inlet of the high temperature heater 5; the outlet of the low temperature end of the low temperature heater 6 is connected with the inlet of the low temperature end of the high temperature heater 5, and the low temperature of the high temperature heater 5The temperature end outlet is connected with the inlet of the expansion generator I7, the inlet of the expansion generator I7 is connected with the hot side inlet of the heat regenerator I8, the hot side outlet of the heat regenerator I8 is connected with the inlet of the intermediate heat exchanger 9, the outlet of the intermediate heat exchanger 9 is connected with the inlet of the gas cooler 10, and the outlet of the gas cooler 10 is connected with the inlet of the compressor II 11.
In supercritical CO 2 In the power circulation system, low-temperature supercritical CO 2 After being heated to a high temperature and high pressure state by a heat source in the high temperature heater 5, enters an expansion generator I7 to do work and generate power, and then the high temperature and low pressure supercritical CO coming out of the expansion generator I7 2 Enters the high temperature end inlet of the heat regenerator I8 and is subjected to low temperature supercritical CO 2 After cooling, enters an intermediate heat exchanger 9 and transcritical CO 2 The power circulation system exchanges heat, and then low-temperature low-pressure supercritical CO 2 Enters the gas cooler 10 to be cooled to a critical area (over-temperature) by a cold source>After 31 ℃, the mixture enters a compressor II 11 to boost pressure, and high-pressure low-temperature supercritical CO from the compressor II 11 2 Is divided into two parts, one part is supercritical CO 2 Enters a heat regenerator I8 for heating, and absorbs high-temperature supercritical CO from an expansion generator I7 2 A part of supercritical CO 2 Heating the mixture in a low-temperature heater 6 to the same temperature, and performing two-part supercritical CO 2 After mixing, the mixture enters a high-temperature heater 5 to complete the circulation.
The trans-critical CO 2 The power circulation system comprises an expansion generator II 12, a condenser 13 and a working medium pump 14; the outlet of the expansion generator II 12 is connected to the inlet of the condenser 13, the outlet of the condenser 13 is connected to the inlet of the working medium pump 14, the outlet of the working medium pump 14 is connected to the low-temperature end inlet of the intermediate heat exchanger 9, and the low-temperature end outlet of the intermediate heat exchanger 9 is connected to the inlet of the expansion generator II 12.
For trans-critical CO 2 Power cycle system, high pressure CO from working fluid pump 14 2 First enters the low temperature end inlet of the intermediate heat exchanger 9, is subjected to supercritical CO 2 High temperature CO in power cycle systems 2 Heating followed by low temperature in the intermediate heat exchanger 9CO at the end outlet 2 After entering an expansion generator II 12 to do work and generate electricity, the water flows into a condenser 13 to be cooled by cooling water to be liquid CO 2 And the mixture enters a working medium pump 14 to be boosted, and the circulation is completed.
In this embodiment, the thermal energy at the outlet of the compressor i 2 is stored in the phase change heat storage tank 3; when the system has electricity demand, the phase change heat storage tank 3 releases heat energy into the high-temperature heater 5 and the low-temperature heater 6 through exothermic circulation working media.
In this embodiment, the cooling medium of the gas cooler 10 and the cooling medium of the condenser 13 are both circulating cooling water.
In this embodiment, the heat energy of the phase change heat storage tank 3 is transferred to the high temperature heater 5 and the low temperature heater 6 as heat sources through heat release working media, and the supercritical CO is obtained through the high temperature heater 5 2 CO in a power cycle system 2 The circulating medium provides heat energy; the intermediate heat exchanger 9 is composed of the low-temperature supercritical CO from the heat regenerator I8 2 As a heat source, the heat source is the transcritical CO through the intermediate heat exchanger 9 2 The circulating working medium in the power circulating system provides heat energy.
The combined power generation system provided by the embodiment has a compact structure, is low in heat storage cost and is not limited by geographical position conditions, and can be used in any place with high-temperature waste heat and large-scale heat storage equipment.
Example 2
As shown in fig. 2, the carnot battery energy storage and CO provided in this embodiment 2 The combined power generation system of the supercritical power cycle is different from embodiment 1 in that: the heat storage system of the Carnot battery also comprises a heat regenerator II 15, wherein the transcritical CO 2 The power cycle system also includes regenerator III 16.
In this embodiment, the outlet of the high temperature end of the regenerator ii 15 is connected to the inlet of the expansion valve 4, the outlet of the phase change heat storage tank 3 is connected to the inlet of the high temperature end of the regenerator ii 15, the outlet of the low temperature end of the regenerator ii 15 is connected to the inlet of the compressor i 2, and the outlet of the heat exchanger 1 is connected to the inlet of the low temperature end of the regenerator ii 15.
In this embodiment, the high temperature end outlet of the regenerator iii 16 is connected to the low temperature end inlet of the intermediate heat exchanger 9, the outlet of the expansion generator ii 12 is connected to the low temperature end inlet of the regenerator iii 16, and the low temperature end outlet of the regenerator iii 16 is connected to the inlet of the condenser 13.
In the carnot battery heat storage system described in this embodiment, a liquid working medium absorbs heat and evaporates into gas through the heat exchanger 1, a gaseous working medium enters the low-temperature end inlet of the regenerator ii 15, a working medium at the low-temperature end outlet of the regenerator ii 15 enters the compressor 2 and is pressurized into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the heat storage inlet of the phase change heat storage tank 3, and high-temperature heat is stored in the phase change heat storage tank 3; the heat storage working medium of the heat-released Carnot battery enters the high-temperature end inlet of the heat regenerator II 15 from the heat storage outlet of the phase change heat storage tank 3, the heat storage working medium at the high-temperature end outlet of the heat regenerator II 15 enters the expansion valve 4, and the heat storage working medium is throttled and depressurized to become saturated liquid working medium to enter the heat exchanger 1 again to absorb high-temperature industrial waste heat.
For trans-critical CO 2 Power cycle system, high pressure CO from working fluid pump 14 2 Firstly, the working medium enters the low-temperature end inlet of the heat regenerator III 16, and the working medium at the low-temperature end outlet of the heat regenerator III 16 enters the low-temperature end inlet of the intermediate heat exchanger 9 and is subjected to supercritical CO 2 High temperature CO in power cycle systems 2 Heating working medium, and then CO at the outlet of the low-temperature end of the intermediate heat exchanger 9 2 After entering an expansion generator II 12 to do work and generate electricity, entering a high-temperature end inlet of a heat regenerator III 16 from an outlet of the expansion generator II 12, and CO at a high-temperature end outlet of the heat regenerator III 16 2 The working medium enters a condenser 13 and is cooled into liquid state by cooling water, and liquid state CO 2 The working medium enters the working medium pump 14 to boost pressure, and circulation is completed.
The combined power generation system of the embodiment has compact structure, low heat storage cost and no limitation of geographical position conditions, and can be used in any place with high-temperature waste heat and large-scale heat storage equipment. Thermal storage system and transcritical CO in Carnot cell 2 The heat regenerator II 15 and the heat regenerator III 16 are respectively added in the power cycle, so that the residual heat energy of the system can be recovered to a greater extent, the heat efficiency of the system can be improved, and the heat efficiency of the system can be ensuredThe residual heat is utilized in a gradient way to the maximum extent.
Example 3
As shown in fig. 3, the carnot battery energy storage and CO provided in this embodiment 2 The combined power generation system of the supercritical power cycle is different from embodiment 1 and embodiment 2 in that: the supercritical CO 2 The power cycle is used as the top cycle of the heat storage system of the Kano battery; the trans-critical CO 2 The power circulation system serves as the bottom circulation of the heat storage system of the Carnot battery. Wherein the high temperature heater 5 and the low temperature heater 6 are disconnected from the phase change heat storage tank 3, the regenerator i 8 is disconnected from the intermediate heat exchanger 9, and the intermediate heat exchanger 9 is disconnected from the gas cooler 10.
In this embodiment, the outlet of the high temperature end of the regenerator i 8 is connected to the inlet of the high temperature end of the heat exchanger 1, the inlet of the high temperature end of the heat exchanger 1 is connected to the inlet of the gas cooler 10, the outlet of the expansion valve 4 is connected to the inlet of the low temperature end of the heat exchanger 1, and the inlet of the low temperature end of the heat exchanger 1 is connected to the inlet of the compressor i 2.
In this embodiment, the heat release outlet of the phase change heat storage tank 3 is connected to the high temperature end inlet of the intermediate heat exchanger 9, the high temperature end outlet of the intermediate heat exchanger 9 is connected to the heat release inlet of the phase change heat storage tank 3, the outlet of the working medium pump 14 is connected to the low temperature end inlet of the intermediate heat exchanger 9, and the low temperature end outlet of the intermediate heat exchanger 9 is connected to the inlet of the expansion generator ii 12.
In supercritical CO 2 In the power circulation system, low-temperature supercritical CO 2 After being heated to a high temperature and high pressure state by high temperature waste heat in the high temperature heater 5, the high temperature waste heat enters the expansion generator I7 to do work and generate power, and then the high temperature and low pressure supercritical CO coming out of the expansion generator I7 2 Enters the high temperature end inlet of the heat regenerator I8 and is subjected to low temperature supercritical CO 2 After cooling, the mixture enters a heat exchanger 1 to exchange heat with a heat storage system of a Carnot battery, and then low-temperature low-pressure supercritical CO is carried out 2 Enters the gas cooler 10 to be cooled to a critical area (over-temperature) by a cold source>31 ℃ is then introduced into the compressor II 11 to be boosted, and the high pressure coming out of the compressor II 11 is lower than Wen ChaolinBoundary CO 2 Is divided into two parts, one part is supercritical CO 2 Enters a heat regenerator I8 for heating, and absorbs high-temperature supercritical CO from an expansion generator I7 2 A part of supercritical CO 2 Enters a low-temperature heater 6 to be heated to the same temperature by waste heat, and two parts of supercritical CO 2 After mixing, the mixture enters a high-temperature heater 5 to complete the circulation.
For a Carnot battery heat storage system, liquid working medium absorbs heat and evaporates into gas through a heat exchanger 1, high-temperature and high-pressure gas is pressurized in a compressor 2, then enters a heat storage inlet of a phase change heat storage tank 3, and high-temperature heat is stored in the phase change heat storage tank 3; the heat storage working medium of the heat-released Carnot battery enters an expansion valve 4 from a heat storage outlet of a phase change heat storage tank 3, throttles and reduces pressure to become a saturated liquid working medium, and then enters a heat exchanger 1 to absorb supercritical CO 2 And (5) waste heat of a power circulation system.
For trans-critical CO 2 Power cycle system, high pressure CO from working fluid pump 14 2 Firstly, the waste gas enters the low-temperature end inlet of the intermediate heat exchanger 9 and is heated by the working medium at the heat release outlet of the phase change heat storage tank 3 in the heat storage system of the Carnot battery, and then the CO at the low-temperature end outlet of the intermediate heat exchanger 9 2 After entering an expansion generator II 12 to do work and generate electricity, the water flows into a condenser 13 to be cooled into liquid state by cooling water, and the liquid state CO 2 And the mixture enters a working medium pump 14 to be boosted, and the circulation is completed.
In the combined power generation system described in this embodiment, industrial waste heat is first utilized to drive supercritical CO 2 The power cycle realizes the first stage recovery and discharge of waste heat, and then supercritical CO 2 The waste heat of the power cycle is stored in the phase change heat storage tank 3 through the Carnot battery heat storage system, and when the system generates electricity demand, the transcritical CO is reused 2 The power cycle converts thermal energy in the phase change thermal storage tank 3 into electrical energy. The combined power generation system can match the heat storage and power generation requirements of industrial waste heat with different temperatures through different combinations of top circulation and bottom circulation, and has wide application prospect.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (5)
1. Carnot battery energy storage and CO 2 A super-transcritical power cycle cogeneration system comprising: carnot battery heat storage system and supercritical CO 2 Power cycle system and transcritical CO 2 A power circulation system; the heat storage system of the Carnot battery and supercritical CO 2 The power circulation system is connected and used for storing industrial waste heat and releasing heat energy into supercritical CO when the system has power demand 2 The power circulation system provides a heat source, the supercritical CO 2 Power circulation system and transcritical CO 2 The power circulation system is connected for generating electricity and is transcritical CO 2 The power cycle system provides a source of heat, the transcritical CO 2 The power circulation system is used for generating electricity;
the Carnot battery heat storage system comprises a heat exchanger (1), a compressor I (2), a phase change heat storage tank (3) and an expansion valve (4), wherein an outlet of the heat exchanger (1) is connected with an inlet of the compressor I (2), an outlet of the compressor I (2) is connected with a heat storage inlet of the phase change heat storage tank (3), a heat storage outlet of the phase change heat storage tank (3) is connected with an inlet of the expansion valve (4), and an outlet of the expansion valve (4) is connected with an inlet of the heat exchanger (1); the phase change heat storage tank (3) and the supercritical CO 2 The power circulation system is connected;
the supercritical CO 2 The power circulation system comprises a high-temperature heater (5), a low-temperature heater (6), an expansion generator I (7), a regenerator I (8), an intermediate heat exchanger (9), a gas cooler (10) and a compressor II (11), wherein a heat release outlet of the phase-change heat storage tank (3) is connected with a high-temperature end inlet of the high-temperature heater (5), and a high-temperature end outlet of the high-temperature heater (5) is connected with a high-temperature end inlet of the low-temperature heater (6)The high-temperature end outlet of the low-temperature heater (6) is connected with the heat release inlet of the phase change heat storage tank (3); the outlet of the compressor II (11) is connected with the low-temperature end inlet of the low-temperature heater (6) and the cold side inlet of the heat regenerator I (8); the cold side outlet of the heat regenerator I (8) is connected with the low temperature end inlet of the high temperature heater (5); the low-temperature end outlet of the low-temperature heater (6) is connected with the low-temperature end inlet of the high-temperature heater (5), the low-temperature end outlet of the high-temperature heater (5) is connected with the inlet of the expansion generator I (7), the inlet of the expansion generator I (7) is connected with the hot side inlet of the heat regenerator I (8), the hot side outlet of the heat regenerator I (8) is connected with the inlet of the intermediate heat exchanger (9), the outlet of the intermediate heat exchanger (9) is connected with the inlet of the gas cooler (10), and the outlet of the gas cooler (10) is connected with the inlet of the compressor II (11);
the supercritical CO 2 The power circulation system is connected with the transcritical CO through an intermediate heat exchanger (9) 2 The power circulation system is connected;
the heat energy of the outlet of the compressor I (2) is stored in the phase-change heat storage tank (3), when the system has electricity demand, the heat energy of the phase-change heat storage tank (3) is transmitted to the high-temperature heater (5) and the low-temperature heater (6) through exothermic working media to serve as heat sources, and the heat sources are the supercritical CO through the high-temperature heater (5) 2 CO in a power cycle system 2 The circulating medium provides heat energy;
the trans-critical CO 2 The power circulation system comprises an expansion generator II (12), a condenser (13) and a working medium pump (14), wherein the outlet of the expansion generator II (12) is connected with the inlet of the condenser (13), the outlet of the condenser (13) is connected with the inlet of the working medium pump (14), the outlet of the working medium pump (14) is connected with the low-temperature end inlet of the intermediate heat exchanger (9), and the low-temperature end outlet of the intermediate heat exchanger (9) is connected with the inlet of the expansion generator II (12); the intermediate heat exchanger (9) is composed of the low-temperature supercritical CO from the heat regenerator I (8) 2 As a heat source, the heat source is the transcritical CO through the intermediate heat exchanger (9) 2 CO in a power cycle system 2 The circulating working medium provides heat energy.
2. The canola battery energy storage and CO of claim 1 2 The ultra-transcritical power cycle combined power generation system is characterized in that the ultra-supercritical CO 2 The power cycle system can also be used as the top cycle of the heat storage system of the Carnot battery, and the transcritical CO 2 The power circulation system is used as the bottom circulation of the heat storage system of the Carnot battery, wherein the high-temperature heater (5) and the low-temperature heater (6) are disconnected with the phase-change heat storage tank (3), the heat regenerator I (8) is disconnected with the intermediate heat exchanger (9), and the intermediate heat exchanger (9) is disconnected with the gas cooler (10);
the high-temperature end outlet of the heat regenerator I (8) is connected with the high-temperature end inlet of the heat exchanger (1), the high-temperature end inlet of the heat exchanger (1) is connected with the inlet of the gas cooler (10), the outlet of the expansion valve (4) is connected with the low-temperature end inlet of the heat exchanger (1), and the low-temperature end inlet of the heat exchanger (1) is connected with the inlet of the compressor I (2);
the heat release outlet of phase change heat storage tank (3) with the high temperature end entry of intermediate heat exchanger (9) links to each other, the high temperature end export of intermediate heat exchanger (9) with the heat release entry of phase change heat storage tank (3) links to each other, the export of working medium pump (14) with the low temperature end entry of intermediate heat exchanger (9) links to each other, the low temperature end export of intermediate heat exchanger (9) with the entry of expansion generator II (12).
3. The canola battery energy storage and CO of claim 1 2 The ultra-transcritical power cycle combined power generation system is characterized in that the Carnot battery energy storage system further comprises a heat regenerator II (15), a high-temperature end outlet of the heat regenerator II (15) is connected with an inlet of the expansion valve (4), an outlet of the phase-change heat storage tank (3) is connected with a high-temperature end inlet of the heat regenerator II (15), a low-temperature end outlet of the heat regenerator II (15) is connected with an inlet of the compressor I (2), and an outlet of the heat exchanger (1) is connected with a low-temperature end inlet of the heat regenerator II (15).
4. The canola battery energy storage and CO of claim 1 or 2 2 A super-transcritical power cycle cogeneration system, wherein said transcritical CO 2 The power circulation system further comprises a heat regenerator III (16), a high-temperature end outlet of the heat regenerator III (16) is connected with a low-temperature end inlet of the intermediate heat exchanger (9), an outlet of the expansion generator II (12) is connected with the low-temperature end inlet of the heat regenerator III (16), and a low-temperature end outlet of the heat regenerator III (16) is connected with an inlet of the condenser (13).
5. The canola battery energy storage and CO of claim 1 2 The ultra-transcritical power cycle combined power generation system is characterized in that cooling media of the gas cooler (10) and the condenser (13) are circulating cooling water, and phase-change heat storage media in the phase-change heat storage tank (3) are inorganic salt high-temperature phase-change heat storage materials.
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