Electrochemical energy storage bidirectional power flow control system
Patent Information
- Application Number
- CN202522284861.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-29
AI Technical Summary
Traditional combined heat and power (CHP) units' peak heat storage method leads to temperature fluctuations and energy waste in the heating network, affecting the safe operation of the heating network and resulting in low efficiency.
An electrochemical energy storage charging and discharging bidirectional power flow control system is adopted, which combines a hot water storage tank and an electrochemical energy storage battery. The hot water storage tank is heated by steam to store heat during off-peak hours and released to the heating network during peak hours. Plate heat exchangers and direct pipelines are used to regulate the heat source supply, so as to achieve efficient storage and release of heat energy.
It alleviated the thermal shock of the heating network, improved the stability of the heating network, reduced energy waste, and enhanced the peak capacity of the units and the efficiency of the boilers.
Smart Images
Figure CN224932834U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power engineering technology, specifically to an electrochemical energy storage charging and discharging bidirectional power flow control system. Background Technology
[0002] Steam turbines and generators are responsible for converting mechanical energy into electrical energy, which is the power generation end; electrochemical batteries are responsible for storing and releasing electrical energy, which is the energy storage end. Together, they constitute a "power generation-energy storage" energy cycle system. Thermal energy is converted into mechanical energy. The high-temperature and high-pressure steam generated by the boiler impacts the turbine blades. The steam drives the blades to rotate the rotor at high speed, completing the conversion of "thermal energy → kinetic energy → mechanical energy". After the steam does work, its temperature and pressure decrease, and it is finally discharged and enters the condenser to condense, forming a cycle. The electrical energy generated by the generator is partly used directly by users, and partly used to charge the electrochemical batteries to store excess electrical energy. When users' electricity demand increases, or the generator output is insufficient, the electrochemical batteries release electrical energy by discharging to supplement the power grid and maintain a stable power supply.
[0003] To maximize peak capacity, traditional cogeneration units typically increase steam extraction during periods of low electricity load to raise the temperature of the circulating water in the heating network, and reduce steam extraction during periods of high electricity load to boost peak capacity. This method of peak storage leads to significant fluctuations in the heating network temperature, affecting the safe operation of the heating network. Furthermore, if the demand from heat users does not increase during the storage period, the heat loss of the heating network increases, resulting in energy waste. Utility Model Content
[0004] The purpose of this invention is to provide an electrochemical energy storage charging and discharging bidirectional power flow control system to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: An electrochemical energy storage charging and discharging bidirectional power flow control system includes a steam turbine, a generator, and an electrochemical energy storage battery. The steam turbine includes a high-pressure cylinder, a medium-pressure cylinder, and a low-pressure cylinder. The steam turbine and the generator work in series to convert the mechanical energy of the steam turbine into electrical energy, which is then delivered to the electrochemical energy storage battery. The steam output from the steam turbine is sent to a grid heater through a steam pipeline. The grid heater is connected to an electrode boiler, which is equipped with a hot water storage tank. The electrode boiler is connected to a boiling water output pipeline, a heating network supply pipeline, and a heating network return pipeline.
[0006] As a further improvement of this utility model: the heating network supply water pipe and the heating network return water pipe are connected to the heating network; The heat pipe network includes two sets of pipe lines a and b with different temperatures. A first plate heat exchanger and a second plate heat exchanger are connected in series between pipe lines a and b.
[0007] As a further embodiment of this utility model: pipelines a and b are respectively provided with straight discharge pipelines connected in parallel with the second plate heat exchanger, and valves for controlling the water circuit of the pipeline network are provided on the straight discharge pipelines, pipelines a and b.
[0008] As a further embodiment of this utility model: a water supply balance pipeline and a network circulation pipeline are connected to the network pipeline b; Both the water supply balance pipeline and the network circulation pipeline are connected to the hot water storage tank, and both the water supply balance pipeline and the network circulation pipeline are equipped with valves for controlling the water flow.
[0009] As a further improvement of this utility model: a hot water pump is installed on the water supply balance pipeline, and the hot water is pumped into the hot water storage tank for storage. The hot water storage tank is connected to the pipeline network line b through the pipeline network circulation pipeline.
[0010] As a further improvement of this utility model: a hot water storage tank is installed on the pipeline circulation line, and the hot water storage tank is equipped with a hot water pump to deliver water to the pipeline circulation line.
[0011] As a further improvement of this utility model: a direct-flow valve for controlling the water path is provided between the pipeline a and the pipeline b. When the direct-flow valve is open, the water path does not pass through the first plate heat exchanger.
[0012] Compared with the prior art, the beneficial effects of this utility model are: This electrochemical energy storage charging and discharging bidirectional power flow control system uses steam from the turbine and condensate to be heated to a balanced temperature by a grid heater before being fed into the electrode boiler. The excess heat generated by the electrode boiler is stored in a hot water storage tank through hot water energy storage. During peak electricity load periods, the heat from the hot water storage tank is released to the heating network. Furthermore, the condensate is preheated through heat exchange and heat storage, reducing boiler energy consumption and improving heat recovery and utilization. Attached Figure Description
[0013] Figure 1 A schematic diagram of a bidirectional power flow control system for electrochemical energy storage charging and discharging; Figure 2 This is a schematic diagram of the heat pipe network in a bidirectional power flow control system for electrochemical energy storage charging and discharging.
[0014] In the diagram: 1. High-pressure cylinder; 2. Medium-pressure cylinder; 3. Low-pressure cylinder; 4. Generator; 5. Electrochemical energy storage battery; 6. Transfer grid heater; 7. Electrode boiler; 8. Hot water storage tank; 9. Heat network water supply pipeline; 10. Heat network return water pipeline; 11. Second plate heat exchanger; 12. Direct discharge pipeline; 13. Direct flow valve; 14. First plate heat exchanger; 15. Water supply balance pipeline; 16. Pipeline circulation pipeline; 17. Hot water discharge pump; 18. Hot water storage tank; 19. Hot water storage tank. Detailed Implementation
[0015] Please see Figure 1 and 2 In this embodiment of the invention, the electrochemical energy storage charging and discharging bidirectional power flow control system includes a steam turbine, a generator 4, and an electrochemical energy storage battery 5. The steam turbine includes a high-pressure cylinder 1, a medium-pressure cylinder 2, and a low-pressure cylinder 3. The steam turbine and generator 4 work in series to convert the mechanical energy of the steam turbine into electrical energy, which is then delivered to the electrochemical energy storage battery 5. The steam output from the steam turbine is sent to a grid heater 6 via a steam pipeline. The grid heater 6 is connected to an electrode boiler 7, which is equipped with a hot water storage tank 8. The electrode boiler 7 is connected to a boiling water output pipeline, a heating network water supply pipeline 9, and a heating network return water pipeline 10. The steam turbine and generator are responsible for converting mechanical energy into electrical energy and are the power generation end. The electrochemical energy storage battery 5 is responsible for generating the electrical energy. Storage and release constitute the energy storage end, together forming an energy cycle system of "power generation-energy storage". It adopts hot water storage tank 8 and electrochemical energy storage technology, combined with electrode boiler deep peak shaving technology. During the low electricity load period, the heat generated by the electrode boiler 7 deep peak shaving is stored in hot water storage tank 8, and the remaining electrical energy is stored in electrochemical energy storage battery 5 for "thermal and power co-storage". During the high electricity load period, the heat in hot water storage tank 8 is released to the heating network. At the same time, electrochemical energy storage battery 5 releases electrical energy to the grid, so as to maximize the peak capacity of the unit while ensuring the stability of the heating load. This scheme alleviates the thermal shock to the heating network during the traditional unit heat storage peak process, reduces energy waste, and achieves the maximum peak capacity.
[0016] In a preferred embodiment, the heating network supply water pipe 9 and the heating network return water pipe 10 are connected to the heating network. The heat pipe network includes two sets of pipes a and b with different temperatures. A first plate heat exchanger 14 and a second plate heat exchanger 11 are connected in series between pipes a and b. When the heat storage of the hot water storage tank 8 cannot meet the heat energy generated during the peak heat storage process of the unit, the heat energy is sent to the heat network water supply pipe 9 to send the excess heat energy out of the pipe network of the electrode boiler 7. The heat is recovered through heat exchange. The heat is recovered through heat exchange between the first plate heat exchanger 14 and the second plate heat exchanger 11. The first plate heat exchanger 14 and the second plate heat exchanger 11 exchange heat with the condensate to increase the temperature of the condensate and reduce the boiler energy consumption.
[0017] In a preferred embodiment, pipelines a and b are respectively provided with direct discharge pipelines 12 connected in parallel with the second plate heat exchanger 11. Valves for controlling the water flow are provided on the direct discharge pipeline 12, pipeline a, and pipeline b. A direct-flow valve 13 for controlling the water flow is provided between pipeline a and pipeline b. When the direct-flow valve 13 is open, the water flow does not pass through the first plate heat exchanger 14. By switching the valve and adjusting its opening, the heat source supply ratio of the first plate heat exchanger 14 and the second plate heat exchanger 11 is controlled, thereby controlling the heat exchange temperature. Through this pipeline connection method, heat sources can be provided to multiple heat exchangers simultaneously, recovering the thermal shock during the peak heat storage process and regulating the boiler's energy consumption.
[0018] In a preferred embodiment, a water supply balance pipeline 15 and a network circulation pipeline 16 are connected to the network pipeline b. Both the water supply balancing pipeline 15 and the network circulation pipeline 16 are connected to the hot water storage tank 19. The water supply balancing pipeline 15 and the network circulation pipeline 16 are equipped with valves for controlling the water circuit. Excess heat is sent to the hot water storage tank 19 for heat storage through the direct discharge pipeline 12 and the network pipeline b. The water supply balancing pipeline 15 is equipped with a hot water discharge pump 17, which sends the hot water to the hot water storage tank 19 for storage. The hot water storage tank 19 is connected to the network pipeline b through the network circulation pipeline 16. During peak electricity consumption, the heat source is sent to the first plate heat exchanger 14 and the second plate heat exchanger 11 for heat exchange through circulation, and continuous preheating is performed to improve boiler efficiency.
[0019] In a preferred embodiment, a hot water storage tank 18 is installed on the pipeline circulation line 16. The hot water storage tank 18 is equipped with a hot water pump to supply water to the pipeline circulation line 16. The hot water storage tank 18 is connected to the hot water storage tank 8. When the hot water storage tank 8 uses water too quickly, the hot water storage tank 18 supplies water to the hot water storage tank 8 to prioritize meeting the heating needs of the electrode boiler 7.
[0020] It should be noted that all the above embodiments belong to the same utility model concept, and the descriptions of each embodiment have different focuses. Where the description in a particular embodiment is not detailed, please refer to the description in other embodiments.
[0021] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An electrochemical energy storage charging and discharging bidirectional power flow control system, comprising a steam turbine, a generator (4), and an electrochemical energy storage battery (5), wherein the steam turbine comprises a high-pressure cylinder (1), a medium-pressure cylinder (2), and a low-pressure cylinder (3), the steam turbine and the generator (4) operate in series, converting the mechanical energy of the steam turbine into electrical energy, which is then delivered to the electrochemical energy storage battery (5), characterized in that, Steam output from the turbine is fed into the grid heater (6) via a steam pipeline. The grid heater (6) is connected to the electrode boiler (7). The electrode boiler (7) is equipped with a hot water storage tank (8). The electrode boiler (7) is connected to the boiling water output pipeline, the heating network water supply pipeline (9), and the heating network return water pipeline (10).
2. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 1, characterized in that, The heating network supply water pipe (9) and the heating network return water pipe (10) are connected to the heating network; The heat pipe network includes two sets of pipe lines a and b with different temperatures. A first plate heat exchanger (14) and a second plate heat exchanger (11) are connected in series between pipe lines a and pipe lines b.
3. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 2, characterized in that, The pipeline a and pipeline b are respectively provided with a straight discharge pipeline (12) connected in parallel with the second plate heat exchanger (11). The straight discharge pipeline (12), pipeline a and pipeline b are all provided with valves for controlling the water circuit of the pipeline network.
4. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 3, characterized in that, The pipeline b is connected to a water supply balance pipeline (15) and a pipeline circulation pipeline (16). Both the water supply balance pipeline (15) and the network circulation pipeline (16) are connected to the hot water storage tank (19). The water supply balance pipeline (15) and the network circulation pipeline (16) are also equipped with valves for controlling the water circuit.
5. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 4, characterized in that, A hot water pump (17) is installed on the water supply balance pipeline (15). The hot water is pumped into the hot water storage tank (19) for storage. The hot water storage tank (19) is connected to the pipeline b through the pipeline circulation pipeline (16).
6. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 4, characterized in that, A hot water tank (18) is installed on the pipeline circulation line (16), and a hot water pump is installed in the hot water tank (18) to deliver water to the pipeline circulation line (16).
7. The electrochemical energy storage charging and discharging bidirectional power flow control system according to claim 3, characterized in that, A direct-flow valve (13) for controlling the water path is installed between pipeline a and pipeline b. When the direct-flow valve (13) is open, the water path does not pass through the first plate heat exchanger (14).