New energy heat supply pipe network energy storage system

Abstract

The invention discloses a new energy heat supply pipe network energy storage system, and belongs to the technical field of energy storage. The system comprises a heat source, a primary pipe network and a heat exchange station, the heat source comprises at least one heat pump unit, the primary pipe network comprises a primary pipe network circulating pump, a primary pipe network water supply pipe and a primary pipe network water return pipe, and the primary pipe network circulating pump is arranged on the primary pipe network water return pipe. An inlet and an outlet of the heat pump unit are communicated with a primary pipe network water supply pipe and a primary pipe network water return pipe respectively. The system can store heat energy when the heat supply demand is low in ebb and release heat when the heat supply demand is high in peak, heat supply loads are balanced, fluctuation of the heat supply system is reduced, heat supply reliability is improved, and operation cost is reduced. The system is simple in structure and easy in engineering application, and the economical efficiency and the stability of the new energy heat supply system can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a new energy heating pipe network energy storage system. Background Art

[0002] Building heating energy consumption accounts for a significant proportion of my country's total energy consumption. Clean energy heating is a key means of achieving the "dual carbon" strategic goals. However, existing clean energy heating systems suffer from low heat source quality, low energy density, and susceptibility to environmental conditions. To ensure a balanced energy supply and demand between the heat source and the user, heat storage systems are often used to improve heating stability.

[0003] Patent application number 201711451153.8, titled "Cogeneration Plant and Peak Shaving Method for Grid Peak Shaving Based on Thermal Power Peak Shifting and Thermal Network Heat Storage," proposes a thermal power plant that participates in grid peak shaving based on thermal power peak shifting and thermal network heat storage. While meeting the thermal load, the thermal power plant utilizes the limited peak-shaving capacity of its turbines and boilers to participate in grid peak shaving based on thermal power peak shifting. Leveraging the thermal network's heat storage characteristics, the thermal power plant leverages the thermal power coupling relationship to further implement grid peak shaving.

[0004] The patent application number is 202010099334.4, and the name is "A method for optimizing the scheduling of a combined electric and thermal system considering the characteristics of the heating network". It proposes that the method for optimizing the scheduling of a combined electric and thermal system can fully tap the heat storage capacity of the heating network, optimize the system operating conditions, increase the flexible scheduling space of cogeneration units, promote wind power consumption, and improve the economy of system operation.

[0005] While existing cogeneration systems can optimize heat supply scheduling, they are mostly at the conceptual design stage and lack specific energy storage implementation plans for the pipeline network. Implementation is complex and engineering implementation is challenging. Therefore, it is necessary to propose a new energy storage system for the heating pipeline network to improve the stability and cost-effectiveness of the heating system. Summary of the Invention

[0006] The purpose of the present invention is to provide a new energy heating pipe network energy storage system with a relatively simple control system, easy operation, and suitable for engineering technology applications, so as to meet the heat storage needs in the field of centralized heating, realize "water and heat storage" and power peak shaving and valley filling, improve the stability of the heating system, and reduce operating costs.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A new energy heating network energy storage system includes a heat source, a primary network, and a heat exchange station. The heat source includes at least one heat pump unit. The primary network includes a primary network circulation pump, a primary network water supply pipe, and a primary network return pipe. The primary network circulation pump is arranged on the primary network return pipe. The inlet and outlet of the heat pump unit are respectively connected to the primary network water supply pipe and the primary network return pipe. The heat exchange station includes a heat exchanger, which is equipped with a secondary pipe network, including a secondary pipe network return pipe, a secondary pipe network water supply pipe, a secondary pipe network bypass pipe, a temperature sensor and an electric regulating valve; the heat exchanger is connected to the primary pipe network water supply pipe and the primary pipe network return pipe, and the heat exchanger is also connected to the secondary pipe network return pipe and the secondary pipe network water supply pipe. A secondary pipe network circulation pump is provided on the secondary pipe network return pipe, and the electric regulating valve is provided on the secondary pipe network bypass pipe.

[0008] Preferably, the secondary pipe network bypass pipe is arranged between the primary pipe network water supply pipe and the primary pipe network return pipe.

[0009] Preferably, the secondary pipe network bypass pipe is arranged between the secondary pipe network return pipe and the secondary pipe network water supply pipe.

[0010] Preferably, the temperature sensor is arranged on the water supply pipe of the secondary pipe network.

[0011] Preferably, the heat storage temperature and the operating time of the heat release process are adjusted according to changes in the grid load.

[0012] Compared with the prior art, the present invention has the following advantages: This system leverages the network's inherent capacity to store energy during low heat demand periods and release heat during peak demand periods, thereby balancing the heating load and reducing the volatility of the heating system. By regulating peak loads, overloaded operation of heat exchange stations and heat pump equipment is reduced, extending the service life of the equipment. This improves the reliability of heating, and its heat storage capacity can cope with sudden heat demands, ensuring that users receive stable heating services during peak periods. In the event of a short-term heat shortage or untimely network adjustments, this heat storage system can serve as an emergency energy source, improving the reliability of the heating system. Storing heat when energy prices are low and using it when they are high can further reduce operating costs while achieving the goal of peak load shaving and valley filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a new energy heating network energy storage system proposed by the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a new energy heating network energy storage system proposed by the present invention. Figure 2 .

[0014] Note in the figure: 1. Heat pump unit a; 2. Heat pump unit b; 3. Primary pipe network circulation pump; 4. Primary pipe network water supply pipe; 5. Primary pipe network return pipe; 6. Secondary pipe network bypass pipe; 7. Secondary pipe network return pipe; 8. Plate heat exchanger; 9. Temperature sensor; 10. Electric control valve; 11. Secondary pipe network circulation pump; 12. Secondary pipe network water supply pipe. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0017] System composition: This system is mainly composed of three parts: heat source - primary pipe network - heat exchange station, among which: The heat source can be geothermal energy, air source heat pump or other new energy heating methods to ensure the sustainability and environmental protection of the system. The heat source includes heat pump unit a1 and heat pump unit b2; The primary network includes a primary network water supply pipe 4, a primary network return pipe 5 and a primary network circulation pump 3, which are responsible for the transportation and storage of heat; the primary network return pipe 5 contains hot water at 30-40°C, and the diameter of the primary network return pipe 5 and the flow rate of the return water in the pipe are determined according to the amount of heat supply and the need for hydraulic balance; the primary network return pipe 5 branches after passing through the primary network circulation pump 3 and is connected to the heat pump unit a1 and the heat pump unit b2 respectively; the heat pump unit a and the heat pump unit b are provided with water supply branches, which are connected to the water supply branches and then merge into the primary network water supply pipe 4. The diameter of the primary network water supply pipe 4 and the flow rate of the return water in the pipe are determined according to the amount of heat supply and the need for hydraulic balance; the primary network supply pipe 4 branches into the plate heat exchanger 8; after completing the heat exchange in the heat exchanger, it returns to the primary network return pipe 5.

[0018] Heat exchange station. In this application, the heat exchange station adopts a plate heat exchanger 8 and is equipped with a secondary pipe network, including a secondary pipe network return pipe 7, a secondary pipe network water supply pipe 12, a secondary pipe network bypass pipe 6, a temperature sensor 9 and an electric regulating valve 10 for stable heat supply.

[0019] In this application, primary heat storage in a pipe network is primarily used for water or similar fluids. The storage temperature is related to the unit's operating time and can be selected based on operational requirements. This system involves two processes: heat storage and heat release. During operation, the system divides a day into three time periods: peak, valley, and average, depending on grid load fluctuations.

[0020] Example 1 Reference Figure 1 A new energy heating network energy storage system includes a heat source, a primary network, and a heat exchange station. The heat source includes at least one heat pump unit, specifically heat pump unit a1 and heat pump unit b2. The primary network includes a primary network circulation pump 3, a primary network water supply pipe 4, and a primary network return pipe 5. The primary network circulation pump 3 is arranged on the primary network return pipe 5. The heat pump unit inlet and outlet are respectively connected to the primary network water supply pipe 4 and the primary network return pipe 5. The heat exchange station includes a heat exchanger, which is equipped with a secondary pipe network including a secondary pipe network return pipe 7, a secondary pipe network water supply pipe 12, a secondary pipe network bypass pipe 6, a temperature sensor 9 and an electric regulating valve 10; the heat exchanger is connected to the primary pipe network supply pipe 4 and the primary pipe network return pipe 5, and the heat exchanger is also connected to the secondary pipe network return pipe 7 and the secondary pipe network water supply pipe 12. A secondary pipe network circulation pump 11 is provided on the secondary pipe network return pipe 7.

[0021] The secondary pipe network bypass pipe 6 is arranged between the primary pipe network water supply pipe 4 and the primary pipe network return pipe 5 . The electric regulating valve 10 is arranged on the secondary pipe network bypass pipe 6 .

[0022] Heat storage process: During off-peak periods, the electric regulating valve 10 inside the heat exchange station opens, allowing return water to bypass the secondary network return pipe 7 and secondary network bypass pipe 6 to the secondary network water supply pipe 12, reducing the flow rate entering the plate heat exchanger 8. A temperature sensor 9 is installed on the secondary network water supply pipe 12 to monitor the temperature and ensure that the supplied hot water temperature reaches above 40°C. When the temperature sensor 9 detects a temperature of 40.5°C, the opening of the electric regulating valve 10 is reduced, increasing the flow rate entering the plate heat exchanger 8 to maintain the water supply temperature. On the primary pipeline side, heat pump units a1 and b2 continue to operate, raising the overall temperature of the water in the pipeline network, achieving the purpose of heat storage.

[0023] Heat release process: During the peak power period, the heat pump units a1 and b2 on the primary network side are shut down, and the heat stored in the primary network during the valley power period is used to supply heat to the secondary network. The electric regulating valve 10 inside the heat exchange station is opened, and the return water is bypassed to the secondary network water supply pipe 12 through the secondary network return pipe 7 and the secondary network bypass pipe 6, reducing the flow entering the plate heat exchanger 8. A temperature sensor 9 is set on the secondary network water supply pipe 12 to monitor the temperature to ensure that the hot water temperature reaches above 40°C. When the temperature monitored by the temperature sensor 9 reaches 40.5°C, the opening of the electric regulating valve 10 is reduced, and the flow entering the plate heat exchanger 8 is increased to ensure the water supply temperature.

[0024] Example 2 Reference Figure 2 , a new energy heating network energy storage system, in this embodiment, the secondary network bypass pipe 6 is arranged between the primary network water supply pipe 4 and the primary network return pipe 5, and the other settings are the same as Example 1.

[0025] Heat storage process: During off-peak periods, the electric regulating valve 10 inside the heat exchange station opens, and water is supplied through the primary network water supply pipe 4 and the primary network bypass pipe 6 to the primary network return pipe 5, reducing the flow rate entering the plate heat exchanger 8. A temperature sensor 9 is installed on the secondary network water supply pipe 12 to monitor the temperature and ensure that the supplied hot water temperature reaches above 40°C. When the temperature sensor 9 detects a temperature of 40.5°C, the opening of the electric regulating valve 10 is reduced, increasing the flow rate entering the plate heat exchanger 8 to ensure the water temperature is maintained. On the primary pipeline side, heat pump units a1 and b2 continue to operate, causing the overall temperature of the water in the pipeline network to rise, achieving the purpose of heat storage.

[0026] Heat Release Process: During peak power periods, heat pump units a1 and b2 on the primary network side utilize heat stored in the primary network during off-peak periods to supply heat to the secondary network. Electric control valve 10 within the heat exchange station opens, allowing water to bypass the primary network's supply pipe 4 and bypass the primary network's bypass pipe 6 to the primary network's return pipe 5, reducing the flow rate into plate heat exchanger 8. A temperature sensor 9 is installed on the secondary network's supply pipe 12 to monitor the temperature, ensuring the hot water temperature remains above 40°C. When the temperature sensor 9 reaches 40.5°C, the opening of electric control valve 10 is reduced, increasing the flow rate into plate heat exchanger 8 to maintain the water temperature.

[0027] The intelligent temperature control system of the present application dynamically adjusts the heat exchange ratio according to the heating demand to ensure that the heat supply meets the real-time demand; in extreme weather or short-term load fluctuations, the system can appropriately adjust the heat storage strategy, optimize the peak-valley switching time, and improve energy utilization efficiency. By optimizing the heat storage / heat release time period, energy utilization efficiency can be improved; the peak shaving and valley filling strategy set by the present application, through the intelligent operation of the heat pump, stores heat during low electricity price periods and releases heat during high electricity price periods, thereby achieving economic optimization. Based on the above, the present invention provides an intelligent and efficient new energy heating pipe network energy storage system, which can effectively solve the fluctuation problem in the heating system, improve the thermal energy utilization rate, and is suitable for multiple application scenarios such as urban centralized heating and industrial heating.

[0028] This patent is indeed feasible in engineering and is in the experimental stage. It can now be achieved by shutting down during peak power periods to save electricity costs.

[0029] This system leverages the inherent capacity of the pipeline network, eliminating the need for additional energy storage equipment and reducing the additional costs associated with installing new equipment. Furthermore, when user heat demand is low, the units operate at full capacity to store heat in the primary pipeline network. During peak heat demand, the heat pump units rarely need to be operated, and the stored heat in the primary pipeline network can be extracted to provide heating to users. Storing heat when energy prices are low and using it when they are high further reduces operating costs while achieving the goal of peak load shifting. The system regulates peak loads, reducing overload on heat exchanger stations and heat pump equipment, preventing continuous operation of heat pump units, and extending the service life of the equipment. This system improves heat supply reliability, with heat storage capacity sufficient to cope with unexpected heat demand, ensuring stable heat supply to users even during peak periods. In the event of a temporary heat shortage or untimely pipeline network adjustments, this heat storage system can serve as an emergency energy source, enhancing the reliability of the heating system.

[0030] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A new energy heating network energy storage system, characterized in that: The heat source comprises a heat source, a primary pipe network and a heat exchange station, wherein the heat source comprises at least one heat pump unit, the primary pipe network comprises a primary pipe network circulation pump (3), a primary pipe network water supply pipe (4) and a primary pipe network return pipe (5), and the primary pipe network circulation pump (3) is arranged on the primary pipe network return pipe (5), and the inlet and outlet of the heat pump unit are respectively connected to the primary pipe network water supply pipe (4) and the primary pipe network return pipe (5); The heat exchange station includes a heat exchanger, which is equipped with a secondary pipe network, including a secondary pipe network return pipe (7), a secondary pipe network water supply pipe (12), a secondary pipe network bypass pipe (6), a temperature sensor (9) and an electric regulating valve (10); the heat exchanger is connected to the primary pipe network water supply pipe (4) and the primary pipe network return pipe (5), and the heat exchanger is also connected to the secondary pipe network return pipe (7) and the secondary pipe network water supply pipe (12). A secondary pipe network circulation pump (11) is provided on the secondary pipe network return pipe (7), and the electric regulating valve (10) is provided on the secondary pipe network bypass pipe (6).

2. The system according to claim 1, wherein: The secondary pipe network bypass pipe (6) is arranged between the primary pipe network water supply pipe (4) and the primary pipe network return pipe (5).

3. The system according to claim 1, wherein: The secondary pipe network bypass pipe (6) is arranged between the secondary pipe network return pipe (7) and the secondary pipe network water supply pipe (12).

4. The system according to any one of claims 1 to 3, characterized in that: The temperature sensor (9) is arranged on the secondary pipe network water supply pipe (12).

5. The system according to claim 1, wherein: The heat storage temperature and the operating time of the heat release process are adjusted according to the changes in the power grid load.

Images