Heat supply system based on low-temperature phase change material heat storage and working method thereof
By using heat storage technology of low temperature phase change materials in the heating system, the problems of low carbon emissions and deep adjustment capabilities in the prior art are solved, efficient heat storage and heating are achieved, and safety of the heating season is ensured.
Patent Information
- Application Number
- CN202411374739.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-04-11
AI Technical Summary
In the prior art, carbon emissions and the deep-tuning capacity of the unit are low, and it is impossible to ensure the safety of centralized heating during the heating season.
The heat storage system based on low-temperature phase change materials is adopted to store heat through the latent heat of the low-temperature phase change materials, and the peak and valley filling of the heat supply are achieved, thereby improving the unit's deep regulation capacity and new energy consumption capacity.
It improves the heat storage density, reduces space occupation, realizes thermoelectric decoupling of thermal power plants, reduces carbon emissions and operating costs, and ensures centralized heating safety during the heating season.
Smart Images
Figure CN119802705A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of heating technology, and in particular to a heating system based on heat storage of low-temperature phase change materials and a working method thereof. Background Art
[0002] In order to build a new power system to promote renewable energy to replace fossil energy, the installed capacity of new energy continues to increase, resulting in the phenomenon of "abandoning wind and solar power". Therefore, coal-fired power needs to play the role of emergency peak-shaving and frequency regulation, and continue to play the role of peak-shaving power source for a long time in the future. At the same time, due to the limitations of thermal power plants in heating capacity, they usually adopt the operation mode of heat-based electricity in winter, and their peak-shaving capacity is restricted by thermal load.
[0003] At present, the thermal-electric decoupling technology mainly adopts unit transformation or adding energy storage facilities in the factory. For cogeneration units, the thermal load relationship between users can be weakened by adding heat storage devices such as electric boilers and phase change heat storage, breaking the "heat-to-electricity" model, thereby achieving thermal-electric decoupling. Commonly used hot water heat storage uses sensible heat to store heat, and the heat storage density is not high. The number of hot water storage tanks required to store the same amount of heat is also greater, occupying a large amount of site and space, and increasing the heat loss of the heat storage tank. Although these technical routes can achieve thermal-electric decoupling, each has certain limitations, and most of them fail to start from the user side and fail to solve the relationship between users and heat loads, which in turn affects the effectiveness of thermal-electric decoupling. Summary of the invention
[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a heating system based on low-temperature phase change material heat storage and its working method, so as to solve the technical problems in the prior art that carbon emissions and the deep adjustment capability of the unit are low, and the safety of centralized heating during the heating season cannot be guaranteed.
[0005] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a heating system based on low-temperature phase change material heat storage, comprising a first regulating valve, a second regulating valve, a third regulating valve, a low-temperature phase change heat storage device, a fourth regulating valve, a heat exchange device and a fifth regulating valve; The high-temperature side inlet of the heat exchange device is connected to the primary network water supply pipe, the high-temperature side outlet of the heat exchange device is connected to the primary network return pipe, the low-temperature side inlet of the heat exchange device is connected to the secondary network return pipe, and the low-temperature side outlet of the heat exchange device is connected to the secondary network water supply pipe; the first regulating valve is arranged on the primary network water supply pipe; the primary network water supply pipe and the heat storage inlet of the low-temperature phase change heat storage device are connected through the heat storage water inlet pipe, and the second regulating valve is arranged on the heat storage water inlet pipe; the heat storage outlet of the low-temperature phase change heat storage device and the primary network return pipe are connected through the heat storage water outlet pipe, and the third regulating valve is arranged on the heat storage water outlet pipe; the heat supply inlet of the low-temperature phase change heat storage device is connected to the secondary network return pipe through the heat supply water inlet pipe, and the fourth regulating valve is arranged on the heat supply water inlet pipe; the heat supply outlet of the low-temperature phase change heat storage device is connected to the secondary network water supply pipe through the heat supply water outlet pipe, and the fifth regulating valve is arranged on the heat supply water outlet pipe.
[0006] Preferably, a first circulating water pump is provided on the heat storage water inlet pipe.
[0007] Preferably, a second circulating water pump is provided on the heating water outlet pipe.
[0008] Preferably, a third circulating water pump is provided on the secondary network return pipe.
[0009] Preferably, the heat exchange device is a plate heat exchanger.
[0010] Preferably, the low-temperature phase change material in the low-temperature phase change thermal storage device is polyethylene glycol 20000.
[0011] Preferably, the heating water outlet pipe and the secondary network return pipe are connected through a four-way valve.
[0012] Preferably, the low-temperature phase-change thermal storage device is provided with a temperature sensor and an electric heater.
[0013] In a second aspect, the present invention further provides a working method of a heating system based on heat storage of low-temperature phase change materials, based on the above-mentioned heating system based on heat storage of low-temperature phase change materials, comprising: When the unit is running under high load conditions at the peak stage, the first regulating valve, the second regulating valve, and the third regulating valve are opened, and the fourth regulating valve and the fifth regulating valve are closed; the primary network water supply from the heat source enters the heat exchange device and the low-temperature phase change heat storage device at the same time to release heat, and the secondary network return water enters the heat exchange device to absorb the heat of the primary network water supply, and after heating, it is sent to the heat user as the secondary network water supply, and enters the heat exchange device again after heat dissipation; the phase change material in the low-temperature phase change heat storage device absorbs the heat of the primary network water supply and melts, and the heat is stored in the latent heat of the phase change material. When the temperature exceeds the melting point of the phase change material, the second regulating valve and the third regulating valve are closed, and the low-temperature phase change heat storage device stops storing heat; the primary network return water that has released heat in the heat exchange device and the low-temperature phase change heat storage device returns to the heat source; When the unit operates under low load conditions in the deep peak regulation stage, the first regulating valve, the second regulating valve and the third regulating valve are closed, and the fourth regulating valve and the fifth regulating valve are opened; the secondary network return water enters the low-temperature phase change heat storage device, absorbs heat from the phase change material, and keeps the temperature unchanged before the phase change material is completely solidified. The secondary network return water is continuously heated and sent to heat users as secondary network supply water after heating. After heat dissipation, it enters the low-temperature phase change heat storage device again.
[0014] Preferably, when the unit operates under high load conditions at the peak stage during the severe cold period, the first regulating valve and the fourth regulating valve are opened, and the second regulating valve, the third regulating valve and the fifth regulating valve are closed; the secondary network return water first enters the low-temperature phase change heat storage device to absorb heat from the phase change material to complete preheating, and then enters the heat exchange device to further absorb the heat of the primary network water supply to heat it again. After heating, it is sent to the heat user as the secondary network water supply, and enters the heat exchange device again after heat dissipation.
[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a heating system based on heat storage of low-temperature phase change materials. Low-temperature phase change materials store heat through latent heat, and the heat storage density is much higher than that of hot water heat storage, and the required space is also smaller. The heat supply is smoothed and valley filled by the low-temperature phase change heat storage device, and the excess heat supply in the peak stage is transferred to the peak regulation stage to supplement the heating capacity, thereby realizing the thermal-electric decoupling of the thermal power plant, improving the deep regulation capability of the unit, increasing the consumption of new energy, and ensuring the safety of centralized heating during the heating season. By modifying the heat exchange station and adding a low-temperature phase change heat storage device, the scope of modification and investment are small, and the heat source is a single water supply network without consuming other energy. Compared with the current addition of molten salt storage tanks in some heat exchange stations, it can greatly reduce operating costs and carbon emissions, and improve the operating energy efficiency of the heating system.
[0016] Furthermore, the low-temperature phase change material uses polyethylene glycol 20000, with a melting point of 65°C and a phase change latent heat of 175kJ / kg. It has the advantages of high heat storage capacity, good thermal and chemical stability, non-toxicity, and non-corrosiveness. It can store more heat in the same volume, thereby ensuring heating safety.
[0017] Furthermore, the heating water outlet pipe and the secondary network return pipe are connected by a four-way valve, which can switch the heating order of the secondary network return water. In severe cold seasons, the water first enters the low-temperature phase change heat storage device for preheating, thereby improving the heating effect.
[0018] Furthermore, the low-temperature phase change heat storage device is provided with a temperature sensor, which can monitor the temperature of the phase change material in the low-temperature phase change heat storage device in real time and switch the heat storage-heat supply state of the low-temperature phase change heat storage device.
[0019] Furthermore, an electric heater is provided in the low-temperature phase-change heat storage device, and electric auxiliary heating is used when the peak load time is too long to ensure the safety of centralized heating.
[0020] The present invention also provides a working method of a heating system based on heat storage of low-temperature phase change materials, which uses a low-temperature phase change heat storage device to smooth the peak of heat supply and transfer the excess heat supply in the peak stage to the peak-shaving stage to supplement the heating capacity, thereby realizing the thermal-electric decoupling of the thermal power plant, improving the deep regulation capability of the unit, increasing the consumption of new energy, and ensuring the safety of centralized heating during the heating season. The present invention has a high degree of automation, low energy consumption, good economic benefits, and makes full use of the heat of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the structure of a heating system based on heat storage of low-temperature phase change materials in an embodiment of the present invention; Figure 2 This is a schematic diagram of the system structure in which a four-way valve is arranged between the heating water outlet pipe and the secondary network return pipe in an embodiment of the present invention.
[0022] In the figure: 1 is the first regulating valve; 2 is the second regulating valve; 3 is the first circulating water pump; 4 is the third regulating valve; 5 is the low-temperature phase change heat storage device; 6 is the fourth regulating valve; 7 is the heat exchange device; 8 is the second circulating water pump; 9 is the fifth regulating valve; 10 is the third circulating water pump; 11 is the four-way valve. DETAILED DESCRIPTION
[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0024] The present invention is further described in detail below in conjunction with the accompanying drawings: The purpose of the present invention is to provide a heating system based on low-temperature phase change material heat storage and its working method, so as to solve the technical problems in the prior art that carbon emissions and the deep adjustment capability of the unit are low, and the safety of centralized heating during the heating season cannot be guaranteed.
[0025] Example 1 See also Figure 1 In one embodiment of the present invention, a heat supply system based on low-temperature phase change material heat storage is provided, comprising a first regulating valve 1, a second regulating valve 2, a third regulating valve 4, a low-temperature phase change heat storage device 5, a fourth regulating valve 6, a heat exchange device 7 and a fifth regulating valve 9; The high temperature side inlet of the heat exchange device 7 is connected to the primary network water supply pipe, the high temperature side outlet of the heat exchange device 7 is connected to the primary network return pipe, the low temperature side inlet of the heat exchange device 7 is connected to the secondary network return pipe, and the low temperature side outlet of the heat exchange device 7 is connected to the secondary network water supply pipe; the first regulating valve 1 is arranged on the primary network water supply pipe; the primary network water supply pipe and the heat storage inlet of the low temperature phase change heat storage device 5 are connected through the heat storage water inlet pipe, and the second regulating valve 2 is arranged on the heat storage water inlet pipe; the heat storage outlet of the low temperature phase change heat storage device 5 is connected to the primary network return pipe through the heat storage water outlet pipe, and the third regulating valve 4 is arranged on the heat storage water outlet pipe; the heat supply inlet of the low temperature phase change heat storage device 5 is connected to the secondary network return pipe through the heat supply water inlet pipe, and the fourth regulating valve 6 is arranged on the heat supply water inlet pipe; the heat supply outlet of the low temperature phase change heat storage device 5 is connected to the secondary network water supply pipe through the heat supply water outlet pipe, and the fifth regulating valve 9 is arranged on the heat supply water outlet pipe.
[0026] In this embodiment, during the heat transfer process, the high-temperature water in the primary network water supply pipe enters through the high-temperature side inlet of the heat exchange device 7 and performs heat exchange with the medium in the heat exchange device 7. After the heat exchange, the water temperature of the primary network decreases, and enters the primary network return pipe through the high-temperature side outlet of the heat exchange device 7. At the same time, the low-temperature water in the secondary network return pipe enters through the low-temperature side inlet of the heat exchange device 7, and the water temperature increases after absorbing heat, and enters the secondary network water supply pipe through the low-temperature side outlet of the heat exchange device 7 to be supplied to users.
[0027] When the water temperature in the primary network water supply pipe is high and the system needs to store thermal energy, the first regulating valve 1 and the second regulating valve 2 are opened to allow high-temperature water to enter the heat storage inlet of the low-temperature phase change heat storage device 5 through the heat storage water inlet pipe for storage.
[0028] After the storage is completed, the second regulating valve 2 is closed and the high-temperature water continues to circulate in the primary network.
[0029] When the stored thermal energy needs to be released to the secondary network, the third regulating valve 4 and the fourth regulating valve 6 are opened to allow the hot water in the low-temperature phase-change thermal storage device 5 to enter the heating system through the heating water inlet pipe.
[0030] The hot water exchanges heat with the water in the secondary network return pipe in the heat exchange device 7 or directly in the heating outlet pipe, and after releasing heat, returns to the heat storage outlet of the low-temperature phase change heat storage device 5 through the heating outlet pipe, or directly flows back through the primary network return pipe.
[0031] Specifically, a first circulating water pump 3 is provided on the heat storage water inlet pipe, a second circulating water pump 8 is provided on the heat supply water outlet pipe, and a third circulating water pump 10 is provided on the secondary network return pipe.
[0032] In this embodiment, the first circulating water pump 3 works to drive the high-temperature water in the primary network water supply pipe through the high-temperature side of the heat exchange device 7 to exchange heat with the medium in the heat exchange device. The low-temperature water after heat exchange enters the primary network return pipe through the high-temperature side outlet of the heat exchange device 7, and part of the water may enter the low-temperature phase change heat storage device 5 through the heat storage water inlet pipe and the second regulating valve 2 for storage. The storage process is also driven by the first circulating water pump 3.
[0033] In this embodiment, the third circulating water pump 10 works to drive the low-temperature water in the secondary network return pipe through the low-temperature side of the heat exchange device 7. After absorbing heat, the water temperature rises and then enters the secondary network water supply pipe to supply users. When thermal energy needs to be stored, the first circulating water pump 3 continues to work and pumps high-temperature water into the low-temperature phase change thermal storage device 5 through the thermal storage water inlet pipe and the second regulating valve 2.
[0034] In this embodiment, the second circulating water pump 8 works to release the hot water stored in the low-temperature phase change heat storage device 5 directly into the secondary network return pipe through the heating water outlet pipe and the fourth regulating valve 6, and after mixing with the secondary network return water driven by the third circulating water pump 10, it enters the heat exchange device 7 or is directly supplied to the user.
[0035] Specifically, the heat exchange device 7 is a plate heat exchanger.
[0036] Among them, the plate heat exchanger allows the two fluids (hot fluid and cold fluid) that need to transfer heat to flow through the two sides of the heat exchanger respectively, separated by a barrier plate in the middle. The hot fluid releases heat on the hot side plate, and the cold fluid absorbs heat on the cold side plate. Heat transfer is mainly carried out in two ways: convection heat transfer and conduction heat transfer. Convection heat transfer refers to the heat taken away by the fluid when it flows, while conduction heat transfer is the heat transfer through the contact between the plate and the fluid. The corrugated plate not only increases the heat dissipation area and improves the heat transfer efficiency, but also enhances the heat transfer effect through turbulence. The corrugations of adjacent plates form contact resistance points, which improves the pressure resistance performance.
[0037] Specifically, the low-temperature phase change material in the low-temperature phase change thermal storage device 5 is polyethylene glycol 20000.
[0038] Among them, polyethylene glycol (PEG) is a commonly used phase change material, especially polyethylene glycol 20000, which is widely used in the field of low-temperature heat storage due to its high phase change latent heat and suitable phase change temperature range. Polyethylene glycol is solid at low temperatures. When the temperature rises to its melting point, a solid-liquid phase change occurs, absorbing and storing a large amount of heat; conversely, when the temperature drops, a liquid-solid phase change occurs, releasing the stored heat.
[0039] In this embodiment, when the low-temperature phase-change heat storage device 5 is connected to the heat source, the high-temperature water in the heat source transfers heat to polyethylene glycol 20000 through the heat exchange device. With the continuous input of heat, the temperature of polyethylene glycol 20000 gradually increases, and when it reaches its melting point, a solid-liquid phase change begins to occur. During the phase change process, polyethylene glycol 20000 absorbs a large amount of heat, but the temperature remains relatively stable until all solid materials are transformed into liquid; the heat absorbed by polyethylene glycol 20000 during the phase change process is stored in the form of latent heat inside it, forming a high-temperature liquid phase change material. Since the specific heat capacity and latent heat value of the phase change material are large, it can store a large amount of heat without causing significant temperature changes.
[0040] When the stored heat needs to be released, the low-temperature phase change heat storage device 5 is isolated from the heat source and connected to the fluid that needs to be heated. At this time, since the ambient temperature is lower than the melting point of polyethylene glycol 20000, the liquid phase change material begins to undergo a liquid-solid phase change. During the phase change process, polyethylene glycol 20000 releases the stored latent heat energy to provide heat for the fluid that needs to be heated; the released heat is transferred to the fluid that needs to be heated through the heat exchange device, raising its temperature; the heated fluid, such as secondary network water supply, is then transported to the user end for use.
[0041] Specifically, according to Figure 2 As shown, the heating water outlet pipe and the secondary network return pipe are connected via a four-way valve 11.
[0042] In this embodiment, the four-way valve 11 also plays a key role in heat transfer when connecting the heating water outlet pipe and the secondary network return pipe. By accurately controlling the flow direction and flow distribution of the fluid, efficient heat transfer and full utilization can be ensured.
[0043] Example 2 The present invention also provides a working method of a heating system based on heat storage of low-temperature phase change materials, based on the above-mentioned heating system based on heat storage of low-temperature phase change materials, comprising: When the unit is running under high load conditions at the peak stage, the first regulating valve 1, the second regulating valve 2, the first circulating water pump 3, the third regulating valve 4, and the third circulating water pump 10 are opened, and the fourth regulating valve 6, the second circulating water pump 8, and the fifth regulating valve 9 are closed; the primary network water supply from the heat source enters the heat exchange device 7 and the low-temperature phase change heat storage device 5 to release heat at the same time, and the secondary network return water enters the heat exchange device 7 to absorb the heat of the primary network water supply, and after heating, it is sent to the heat user as the secondary network water supply, and enters the heat exchange device 7 again after heat dissipation; the phase change material in the low-temperature phase change heat storage device 5 absorbs the heat of the primary network water supply and melts, and the heat is stored in the latent heat of the phase change material. When the temperature exceeds the melting point of the phase change material, the second regulating valve 2, the first circulating water pump 3 and the third regulating valve 4 are closed, and the low-temperature phase change heat storage device 5 stops storing heat; the primary network return water after releasing heat in the heat exchange device 7 and the low-temperature phase change heat storage device 5 returns to the heat source; When the unit operates under low load conditions in the deep peak regulation stage, the first regulating valve 1, the second regulating valve 2, the first circulating water pump 3, and the third regulating valve 4 are closed, and the fourth regulating valve 6, the second circulating water pump 8, the fifth regulating valve 9, and the third circulating water pump 10 are opened; the secondary network return water enters the low-temperature phase change heat storage device 5, absorbs heat from the phase change material, and the temperature remains unchanged before the phase change material is completely solidified, and the secondary network return water is continuously heated. After heating, it is sent to the heat user as the secondary network supply water, and enters the low-temperature phase change heat storage device 5 again after heat dissipation.
[0044] When the unit is running at high load in the peak stage during the severe cold season, the first regulating valve 1, the fourth regulating valve 6, the second circulating water pump 8, and the third circulating water pump 10 are opened, and the second regulating valve 2, the first circulating water pump 3, the third regulating valve 4, and the fifth regulating valve 9 are closed; Figure 2 , and the right and lower paths of the four-way valve 11 are connected, and the left and upper paths are closed; the secondary network return water first enters the low-temperature phase change heat storage device 5 to absorb the heat from the phase change material to complete preheating, and then enters the heat exchange device 7 to further absorb the heat of the primary network water supply to heat up again, and after heating, it is sent to the heat user as the secondary network water supply, and enters the heat exchange device 7 again after heat dissipation.
[0045] In summary, the present invention provides a working method of a heating system based on heat storage of low-temperature phase change materials. Low-temperature phase change materials store heat through latent heat, and the heat storage density is much higher than that of hot water heat storage, and the required space is also smaller. The heat supply is smoothed and valley filled by a low-temperature phase change heat storage device, and the excess heat supply in the peak stage is transferred to the peak regulation stage to supplement the heating capacity, thereby realizing the thermal-electric decoupling of the thermal power plant, improving the deep regulation capability of the unit, increasing the absorption of new energy, and ensuring the safety of centralized heating during the heating season. By modifying the heat exchange station and adding a low-temperature phase change heat storage device, the scope of modification and investment are small, and the heat source is a single water supply network without consuming other energy. Compared with the current addition of molten salt storage tanks in some heat exchange stations, it can greatly reduce operating costs and carbon emissions, and improve the operating energy efficiency of the heating system.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A heating system based on low-temperature phase change material heat storage, characterized in that: It comprises a first regulating valve (1), a second regulating valve (2), a third regulating valve (4), a low-temperature phase-change heat storage device (5), a fourth regulating valve (6), a heat exchange device (7) and a fifth regulating valve (9); The high-temperature side inlet of the heat exchange device (7) is connected to the primary network water supply pipe, the high-temperature side outlet of the heat exchange device (7) is connected to the primary network return pipe, the low-temperature side inlet of the heat exchange device (7) is connected to the secondary network return pipe, and the low-temperature side outlet of the heat exchange device (7) is connected to the secondary network water supply pipe; the first regulating valve (1) is arranged on the primary network water supply pipe; the primary network water supply pipe is connected to the heat storage inlet of the low-temperature phase change heat storage device (5) via the heat storage water inlet pipe, and the second regulating valve (2) is arranged on the heat storage device (5) The heat storage outlet of the low-temperature phase-change heat storage device (5) is connected to the primary network return pipe via a heat storage outlet pipe, and the third regulating valve (4) is arranged on the heat storage outlet pipe; the heat supply inlet of the low-temperature phase-change heat storage device (5) is connected to the secondary network return pipe via a heat supply inlet pipe, and the fourth regulating valve (6) is arranged on the heat supply inlet pipe; the heat supply outlet of the low-temperature phase-change heat storage device (5) is connected to the secondary network water supply pipe via a heat supply outlet pipe, and the fifth regulating valve (9) is arranged on the heat supply outlet pipe.
2. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: A first circulating water pump (3) is provided on the heat storage water inlet pipe.
3. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: A second circulating water pump (8) is provided on the heating water outlet pipe.
4. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: A third circulating water pump (10) is provided on the secondary network return water pipe.
5. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: The heat exchange device (7) is a plate heat exchanger.
6. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: The low-temperature phase change material in the low-temperature phase change heat storage device (5) is polyethylene glycol 20000.
7. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: The heating water outlet pipe and the secondary network return water pipe are connected via a four-way valve (11).
8. A heating system based on low temperature phase change material heat storage according to claim 1, characterized in that: The low-temperature phase-change heat storage device (5) is provided with a temperature sensor and an electric heater.
9. A working method of a heating system based on heat storage of low temperature phase change materials, characterized in that: A heating system based on low temperature phase change material heat storage according to any one of claims 1 to 8, comprising: When the unit is operated under high load conditions at the peak stage, the first regulating valve (1), the second regulating valve (2), and the third regulating valve (4) are opened, and the fourth regulating valve (6) and the fifth regulating valve (9) are closed; the primary network water supply from the heat source simultaneously enters the heat exchange device (7) and the low-temperature phase change heat storage device (5) to release heat, and the secondary network return water enters the heat exchange device (7) to absorb the heat of the primary network water supply, and after the temperature is increased, it is sent to the heat user as the secondary network water supply, and after the heat is dissipated, it enters the heat exchange device (7) again; the phase change material in the low-temperature phase change heat storage device (5) absorbs the heat of the primary network water supply and melts, and the heat is stored in the latent heat of the phase change material. When the temperature exceeds the melting point of the phase change material, the second regulating valve (2) and the third regulating valve (4) are closed, and the low-temperature phase change heat storage device (5) stops storing heat; the primary network return water that has released heat in the heat exchange device (7) and the low-temperature phase change heat storage device (5) returns to the heat source; When the unit is operated under low load conditions in the deep peak regulation stage, the first regulating valve (1), the second regulating valve (2), and the third regulating valve (4) are closed, and the fourth regulating valve (6) and the fifth regulating valve (9) are opened; the secondary network return water enters the low-temperature phase change heat storage device (5), absorbs heat from the phase change material, and maintains a constant temperature before the phase change material is completely solidified, and the secondary network return water is continuously heated. After the temperature is increased, it is sent to the heat user as the secondary network supply water, and after the heat is dissipated, it enters the low-temperature phase change heat storage device (5) again.
10. The working method of a heating system based on low temperature phase change material heat storage according to claim 9, characterized in that: When the unit is operated under high load conditions at the peak stage during the severe cold season, the first regulating valve (1) and the fourth regulating valve (6) are opened, and the second regulating valve (2), the third regulating valve (4) and the fifth regulating valve (9) are closed; the secondary network return water first enters the low-temperature phase change heat storage device (5) to absorb heat from the phase change material to complete preheating, and then enters the heat exchange device (7) to further absorb heat from the primary network water supply to heat it again, and after heating, it is sent to the heat user as the secondary network water supply, and after heat dissipation, it enters the heat exchange device (7) again.