A high-efficiency electric thermal energy storage power generation system and method
By adopting hybrid cycle and Rankine forward-reverse cycle methods in the electric heating energy storage re-power system, an efficient electric heating energy storage power generation system was designed, which solved the problem of low efficiency of the existing system and achieved efficient electric heating mutual storage and energy utilization.
Patent Information
- Application Number
- CN202510020317.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-04-04
AI Technical Summary
The entire chain of the existing electric-thermal energy storage and re-generating system is relatively low, making it difficult to effectively save electricity and expand applications.
Using the hybrid cycle method, an efficient electric heating energy storage power generation system was designed, including a condenser evaporator, refrigeration compressor, evaporator, heat storage tank, water vapor compressor, condenser, turbo expander and generator. Through the Rankine forward and reverse cycle, efficient mutual storage of electricity → heat (storage) → electricity is achieved.
The efficiency of the system is significantly improved, the energy efficiency ratio reaches 3.2, and the comprehensive efficiency is increased to more than 300%, which can save energy and improve energy utilization, and is suitable for energy storage technologies in various fields.
Smart Images
Figure CN119754888A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of new energy utilization, and mainly relates to a high-efficiency electric thermal energy storage power generation system and method. Background Art
[0002] Energy storage is currently the main method to solve the temporal and spatial randomness and imbalance of energy, and is also a key technology for solving climate problems and dual carbon goals.
[0003] How to utilize electric thermal energy storage to generate electricity and the exergy efficiency of the entire chain of electric thermal energy storage to generate electricity have become breakthroughs in further saving electricity and expanding its application. Summary of the invention
[0004] The purpose of the present invention is to utilize a hybrid cycle method to propose a high-efficiency electric thermal energy storage power generation system and method.
[0005] In order to achieve the above object, the solution of the present invention is: On the one hand, a high-efficiency electric thermal energy storage power generation system is provided, comprising a condenser evaporator, a refrigeration compressor, an evaporator, a heat storage tank, a water vapor compressor, a condenser, a turbo expander and a generator; wherein the heat storage tank has a built-in steam generator; The feed water enters from the inlet of the condenser evaporator, the outlet of the condenser evaporator is respectively connected to the inlet of the water vapor compressor and the inlet of the heat storage tank, the outlet of the water vapor compressor is connected to the inlet of the heat storage tank, and the outlet of the heat storage tank outputs hot water; The outlet of the refrigeration compressor is connected to the working medium inlet of the condenser evaporator, the working medium outlet of the condenser evaporator is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the refrigeration compressor; The outlet of the turboexpander is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the steam generator, the outlet of the steam generator is connected to the inlet of the turboexpander, and the rotor of the turboexpander is connected to the generator.
[0006] Furthermore, the evaporator is also connected to an environmental heat source, which provides the evaporator with heat required for evaporation.
[0007] Furthermore, the outlet of the condenser evaporator is connected to the inlet of the heat storage tank through a first booster pump.
[0008] Furthermore, a first valve is provided between the first booster pump and the inlet of the heat storage tank.
[0009] Furthermore, a second valve is provided between the outlet of the condenser evaporator and the inlet of the water vapor compressor.
[0010] Furthermore, the working medium outlet of the condenser evaporator is connected to the inlet of the evaporator through the expansion mechanism and the inlet of the steam generator.
[0011] Furthermore, the condenser is also connected to a cold source, which provides the condenser with the cold source required for condensation.
[0012] Furthermore, the outlet of the condenser is connected to the inlet of the steam generator via a second booster pump.
[0013] On the other hand, a control method of the above system is also provided, and the specific process of the method is as follows: After the feed water enters the condenser evaporator, it is divided into two paths: one path is reduced in pressure to the set water vapor saturation pressure, then absorbs heat in the evaporator and vaporizes into water vapor. The water vapor enters the water vapor compressor and is compressed to the saturation pressure corresponding to the hot water, and then enters the heat storage tank; the other path is pressurized and enters the heat storage tank; the compressed water vapor and the pressurized water in the heat storage tank are mixed to achieve saturated hot water with the required thermal parameters; The working fluid from the refrigeration compressor enters the condenser evaporator to release heat, then enters the evaporator to absorb heat from the ambient heat source, and finally enters the refrigeration compressor again to increase temperature and pressure, forming a complete vapor compression working fluid thermodynamic cycle, namely the reverse Rankine cycle; The non-aqueous working medium is converted into steam through the steam generator. The steam enters the turbine expander to expand and do work, and then passes through the condenser to become a liquid working medium. The liquid working medium enters the steam generator again to form a cycle, namely a closed Rankine cycle; among them, the generator converts the expansion work into electrical energy output.
[0014] Compared with the prior art, the present invention has the following significant advantages: the present invention is based on the Rankine positive and reverse cycle electricity→heat (storage)→electricity system, realizing a new green high-exergy electricity-heat mutual storage technology, which can greatly improve efficiency, save energy, and improve energy utilization. It can be widely used in various fields and is a leap forward in energy storage technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a system principle diagram of the present invention.
[0016] Figure 1 Winning bid number name: 1-water supply, 2-condenser evaporator, 3-refrigeration compressor, 4-evaporator, 5-ambient heat source, 6-expansion mechanism, 7, 13-boost pump, 8, 12-valve, 9-heat storage tank, 10-high-temperature water outlet, 11-water vapor compressor, 14-cold source, 15-condenser, 16-turboexpander, 17-generator. DETAILED DESCRIPTION
[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0018] Figure 1It is a schematic diagram of a high-efficiency electric thermal energy storage power generation system. The system includes a condenser evaporator 2, a refrigeration compressor 3, an evaporator 4, a heat storage tank 9, a water vapor compressor 11, a condenser 15, a turbo expander 16 and a generator 17; wherein the heat storage tank 9 has a built-in steam generator.
[0019] The feed water 1 enters from the inlet of the condenser evaporator 2, and the outlet of the condenser evaporator 2 is respectively connected to the inlet of the water vapor compressor 11 and the inlet of the heat storage tank 9, the outlet of the water vapor compressor 11 is connected to the inlet of the heat storage tank 9, and the outlet of the heat storage tank 9 outputs high-temperature hot water 10.
[0020] After the feed water 1 enters the condenser evaporator 2, it is divided into two paths: one path is reduced in pressure to the set water vapor saturation pressure, absorbs heat in the condenser evaporator 2 and vaporizes into water vapor, the water vapor enters the water vapor compressor 11 and is compressed to the saturation pressure corresponding to the hot water, and then enters the heat storage tank 9; the other path is pressurized and directly enters the heat storage tank 9; the compressed water vapor and the pressurized water in the heat storage tank 9 are mixed to reach the saturated state hot water with the required thermodynamic parameters, forming a heat storage (semi-reverse Rankine) cycle.
[0021] The outlet of the refrigeration compressor 3 is connected to the working medium inlet of the condenser evaporator 2 , the working medium outlet of the condenser evaporator 2 is connected to the inlet of the evaporator 5 , and the outlet of the evaporator 4 is connected to the inlet of the refrigeration compressor 3 .
[0022] The working fluid coming out of the refrigeration compressor 3 enters the condenser evaporator 2 in turn to release heat, then enters the evaporator 4 after throttling and cooling to absorb heat from the ambient heat source, and finally enters the refrigeration compressor 3 again to increase the temperature and pressure, forming a complete vapor compression working fluid thermodynamic cycle, namely the reverse Rankine cycle.
[0023] The above process realizes electric heat storage, and the high-temperature hot water 10 can be used directly as heat. For example, if the water temperature is increased from 30°C to 120°C, the energy efficiency can reach above 3.2, and the exergy efficiency can reach above 70%.
[0024] The outlet of the turboexpander 16 is connected to the inlet of the condenser 15 , the outlet of the condenser 15 is connected to the inlet of the steam generator, the outlet of the steam generator is connected to the inlet of the turboexpander 16 , and the rotor of the turboexpander 16 is connected to the generator 17 .
[0025] The non-aqueous working medium absorbs heat in the (non-aqueous) steam generator built into the heat storage tank 9 and turns into steam, and enters the turbo expander 16 to expand and do work. The turbo expander 16 is connected to the generator 17 to convert the expansion work into electrical energy output. The non-aqueous working medium expands and enters the condenser 15, where it turns into liquid under the cooling of the cold source. After passing through the booster pump 13, it enters the non-aqueous steam generator for circulation, i.e., a closed Rankine cycle.
[0026] The above process realizes power generation after electric heat storage. Since the energy efficiency ratio of electric heat storage has reached 3.2, although the thermal efficiency of the Rankine cycle is low, its comprehensive efficiency is increased to more than 300% compared with the conventional cycle.
[0027] The system of the present invention has three operating modes: Electric heat storage method: operating a semi-reverse Rankine cycle system; Power generation method: operating a Rankine cycle system; Electric heat storage + power generation simultaneously: a semi-reverse Rankine cycle system and a Rankine cycle system operate simultaneously.
[0028] The present invention is based on the Rankine forward and reverse cycle electricity→heat (storage)→electricity system, realizing a new technology of green high-exergy electricity-heat mutual storage, which can greatly improve efficiency, save energy, and increase energy utilization. It can be widely used in various fields and is a leap forward in energy storage technology.
[0029] The above embodiments are only for illustrating the technical idea of the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.
Claims
1. A high-efficiency electric thermal energy storage power generation system, characterized in that: The system comprises a condenser evaporator (2), a refrigeration compressor (3), an evaporator (4), a heat storage tank (9), a water vapor compressor (11), a condenser (15), a turbo expander (16) and a generator (17); wherein the heat storage tank (9) has a built-in steam generator; The feed water (1) enters from the inlet of the condenser evaporator (2), the outlet of the condenser evaporator (2) is connected to the inlet of the water vapor compressor (11) and the inlet of the heat storage tank (9), respectively, the outlet of the water vapor compressor (11) is connected to the inlet of the heat storage tank (9), and the outlet of the heat storage tank (9) outputs hot water (10); The outlet of the refrigeration compressor (3) is connected to the working medium inlet of the condenser evaporator (2), the working medium outlet of the condenser evaporator (2) is connected to the inlet of the evaporator (4), and the outlet of the evaporator (4) is connected to the inlet of the refrigeration compressor (3); The outlet of the turboexpander (16) is connected to the inlet of the condenser (15), the outlet of the condenser (15) is connected to the inlet of the steam generator, the outlet of the steam generator is connected to the inlet of the turboexpander (16), and the rotor of the turboexpander (16) is connected to the generator (17).
2. The system according to claim 1, characterized in that The evaporator (4) is also connected to an environmental heat source (5), and the environmental heat source (5) provides the evaporator (4) with the heat source required for evaporation.
3. The system according to claim 1, characterized in that The outlet of the condenser evaporator (2) is connected to the inlet of the heat storage tank (9) via a first booster pump (7).
4. The system according to claim 3, characterized in that A first valve (8) is provided between the first booster pump (7) and the inlet of the heat storage tank (9).
5. The system according to claim 1, characterized in that A second valve (12) is provided between the outlet of the condenser evaporator (2) and the inlet of the water vapor compressor (11).
6. The system according to claim 1, characterized in that The working fluid outlet of the condenser evaporator (2) is connected to the inlet of the evaporator (4) through the expansion mechanism (6) and the inlet of the steam generator.
7. The system according to claim 1, characterized in that The condenser (15) is also connected to a cold source (14), and the cold source (14) provides the condenser (15) with a cold source required for condensation.
8. The system according to claim 1, characterized in that The outlet of the condenser (15) is connected to the inlet of the steam generator via the second booster pump (13).
9. The control method of the system according to any one of claims 1 to 8, characterized in that: The specific process of this method is as follows: After the feed water (1) enters the condenser evaporator (2), it is divided into two paths: one path is depressurized to a set water vapor saturation pressure, then absorbs heat in the evaporator (4) and vaporizes into water vapor, the water vapor enters the water vapor compressor (11) and is compressed to a saturation pressure corresponding to hot water, and then enters the heat storage tank (9); the other path is pressurized and enters the heat storage tank (9); the compressed water vapor and the pressurized water in the heat storage tank (9) are mixed to obtain saturated hot water (13) with required thermal parameters; The working fluid from the refrigeration compressor (3) enters the condenser evaporator (2) to release heat, then enters the evaporator (4) to absorb heat from the ambient heat source, and finally enters the refrigeration compressor (3) again to increase temperature and pressure, thereby forming a complete vapor compression working fluid thermodynamic cycle, namely, a reverse Rankine cycle. The non-aqueous working medium is converted into steam through the steam generator. The steam enters the turbine expander (16) to expand and perform work, and then passes through the condenser (15) to become a liquid working medium. The liquid working medium enters the steam generator again, forming a cycle, i.e., a closed Rankine cycle. The generator (17) converts the expansion work into electrical energy output.