Wind and light storage integrated heat supply system

Abstract

The utility model discloses a wind and light storage integrated heat supply system, which belongs to the technical field of heat supply systems, and comprises a wind and light power generation unit and a heat exchange unit, a fused salt heat storage brick composite heat storage unit is arranged between the wind and light power generation unit and the heat exchange unit, and the fused salt heat storage brick composite heat storage unit comprises a fused salt heat storage mechanism and a heat storage brick mechanism, the heat storage brick mechanism comprises a heat preservation shell and a heat storage brick module, and the heat storage brick module is provided with a through hole. The fused salt heat storage mechanism comprises a fused salt electric heater, a fused salt inlet main pipe, fused salt branch pipes, a fused salt outlet main pipe, a fused salt box and a fused salt pump, and the multiple fused salt branch pipes arranged side by side are inserted into the through holes respectively. According to the wind-solar-storage integrated heat supply system, the fused salt heat storage brick composite heat storage unit is arranged between the wind-solar power generation unit and the heat exchange unit, fused salt is used as a heat transfer and exchange medium, the defects of a double-tank fused salt heat storage technology and a solid magnesite brick heat storage technology are overcome, and the stability and practicability of system output are improved.

Description

Technical Field

[0001] This utility model relates to the field of heating system technology, and in particular to an integrated wind, solar and energy storage heating system. Background Technology

[0002] The processing and production within the industrial park have a large demand for steam and heat. In order to reduce electricity consumption, existing technologies use wind and solar power generation to supplement it. The energy output mode of the existing wind and solar energy storage system is mainly electricity, which increases the grid's absorption burden.

[0003] Existing high-temperature thermal storage technologies typically use dual-tank molten salt and magnesium brick solid thermal storage. For example, patent application publication number CN117458581A discloses a photovoltaic-photothermal-molten salt distributed peak-shaving power system that uses dual-tank molten salt thermal storage technology. However, after the system is molten salted, the molten salt must be kept in a high-temperature liquid state to maintain its fluidity and prevent pipe blockage. Since the dual-tank molten salt storage capacity is large, shutdown will lead to damage to the molten salt tanks and pipelines. Electric heat tracing is usually used, but the operating cost of electric heat tracing is high during shutdown.

[0004] For example, the patent with announcement number CN219735441U discloses a solar photovoltaic power generation and heating device based on solid heat storage. It adopts magnesium brick solid heat storage technology, which requires laying electric heating wires inside the heat storage layer. The electric heating wires are prone to melting and have a high failure rate. Solid heat storage requires the use of a high-power fan to output heat through air-water heat exchange via a finned tube heat exchanger, which makes it difficult to ensure a stable output of heat. Utility Model Content

[0005] The purpose of this invention is to provide an integrated wind, solar, and energy storage heating system to solve the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model provides an integrated wind, solar, and energy storage heating system, including a wind and solar power generation unit and a heat exchange unit. A molten salt thermal storage brick composite thermal storage unit is provided between the wind and solar power generation unit and the heat exchange unit. The molten salt thermal storage brick composite thermal storage unit includes a molten salt thermal storage mechanism and a thermal storage brick mechanism. The thermal storage brick mechanism includes an insulation shell and several parallel thermal storage brick modules disposed inside the insulation shell. The thermal storage brick modules have through holes. The molten salt thermal storage mechanism includes a molten salt electric heater connected in series, a molten salt inlet main pipe, several parallel molten salt branch pipes, a molten salt outlet main pipe, a molten salt tank, and a molten salt pump. The molten salt outlet main pipe is connected to a salt evaporation tank, which is connected to the molten salt tank through the salt evaporation pump. The several parallel molten salt branch pipes are respectively inserted into the through holes.

[0007] Preferably, the wind and solar power generation unit includes wind and solar power generation equipment and a distribution box, the distribution box being electrically connected to the power grid and electrically connected to the molten salt electric heater.

[0008] Preferably, the heat exchange unit includes a heat exchanger, and the main outlet molten salt pipe is disposed inside the heat exchanger.

[0009] Preferably, the heat exchange medium in the heat exchange unit is water. The heat exchange unit also includes a steam distribution cylinder, a thermal deaerator, a feed water pump, a makeup water pump, and a water softening device. The water softening device is connected in series with the makeup water pump. The makeup water pump is connected to the inlet of the thermal deaerator for makeup water to the thermal deaerator. The outlet of the thermal deaerator is connected to the inlet of the heat exchanger through the feed water pump for feeding water to the heat exchanger. The steam supply pipe of the heat exchanger is connected to the thermal deaerator through a circulation pipe. The steam supply pipe of the heat exchanger is connected to the steam distribution cylinder.

[0010] Preferably, the heat exchange medium in the heat exchange unit is oil, and the heat exchange unit also includes high and low level oil storage tanks, an oil-gas separator, a heat transfer oil circulation pump, and a heat transfer oil cooling device connected in series, with a heat exchanger provided between the heat transfer oil circulation pump and the heat transfer oil cooling device.

[0011] Preferably, the cross-section of the through hole is circular, cross-shaped, or rectangular, and the cross-section of the molten salt branch pipe is adapted to the through hole.

[0012] Therefore, the beneficial effects of the wind-solar-storage integrated heating system described above are as follows: a molten salt thermal storage brick composite thermal storage unit is installed between the wind-solar power generation unit and the heat exchange unit. Molten salt is used as the heat transfer medium. Compared to solid thermal storage, which uses a variable frequency fan to drive air circulation and release a large amount of heat energy from the stored heat into the air, and compared to high-temperature air exchanging heat through a finned tube heat exchanger, this reduces the fluctuation and instability of the system's heat output. It also avoids the problems of high failure rate and short lifespan of the built-in electric heating wires in solid thermal storage magnesia bricks. This overcomes the shortcomings of both dual-tank molten salt thermal storage technology and solid magnesia brick thermal storage technology, improving the stability and practicality of the system output.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment 1 of the wind-solar-storage integrated heating system of this utility model;

[0015] Figure 2 This is a schematic diagram of the heat storage brick module structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of an embodiment 2 of the wind-solar-storage integrated heating system of this utility model.

[0017] Figure Labels

[0018] 1. Molten salt thermal storage brick composite thermal storage unit; 101. Molten salt inlet main pipe; 102. Insulated outer shell; 103. Molten salt electric heater; 104. Molten salt pump; 105. Molten salt tank; 106. Salt drain tank; 107. Salt drain pump; 108. Molten salt outlet main pipe; 109. Molten salt branch pipe; 110. Built-in electric heating; 1011. Thermal storage brick module; 1012. Through hole.

[0019] 2. Heat exchange unit; 201. Heat exchanger; 202. Steam separator; 203. Thermal deaerator; 204. Feed water pump; 205. Make-up water pump; 206. Softened water device; 207. Heat transfer oil cooling equipment; 208. Heat transfer oil circulation pump; 209. High and low level oil storage tank equipment; 210. Oil-gas separator.

[0020] 3. Wind and solar power generation unit; 301. Wind and solar power generation equipment; 302. Distribution box; 303. Power grid. Detailed Implementation

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0023] Example 1

[0024] like Figure 1As shown, a wind-solar-storage integrated heating system includes a wind-solar power generation unit 3 and a heat exchange unit 2. A molten salt thermal storage brick composite thermal storage unit 1 is arranged between the wind-solar power generation unit 3 and the heat exchange unit 2. The molten salt thermal storage brick composite thermal storage unit 1 includes a molten salt thermal storage mechanism and a thermal storage brick mechanism. The thermal storage brick mechanism includes an insulation shell 102 and several parallel thermal storage brick modules 1011 arranged inside the insulation shell 102. The thermal storage brick modules 1011 have through holes 1012. The molten salt thermal storage mechanism includes a molten salt electric heater 103 connected in series, a molten salt inlet main pipe 101, several parallel molten salt branch pipes 109, a molten salt outlet main pipe 108, a molten salt tank 105, and a molten salt pump 104. The molten salt outlet main pipe 108 is connected to a salt evaporation tank 106. The salt evaporation tank 106 is connected to the molten salt tank 105 through a salt evaporation pump 107. The several parallel molten salt branch pipes 109 are respectively inserted into the through holes 1012.

[0025] The wind and solar power generation unit 3 includes a wind and solar power generation device 301 and a distribution box 302. The distribution box 302 is electrically connected to the power grid 303 and to the molten salt electric heater 103.

[0026] The heat exchange unit 2 includes a heat exchanger 201, with a molten salt outlet main pipe 108 disposed within the heat exchanger 201. In this embodiment, the heat exchange medium in the heat exchange unit 2 is water. The heat exchange unit 2 also includes a steam distribution cylinder 202, a thermal deaerator 203, a feed water pump 204, a makeup water pump 205, and a water softening device 206. The water softening device 206 is connected in series with the makeup water pump 205. The makeup water pump 205 is connected to the inlet of the thermal deaerator 203 for makeup water supply to the thermal deaerator 203. The outlet of the thermal deaerator 203 is connected to the inlet of the heat exchanger 201 via the feed water pump 204 for feeding water into the heat exchanger 201. The steam supply pipe of the heat exchanger 201 is connected to the thermal deaerator 203 via a circulation pipe, and the steam supply pipe of the heat exchanger 201 is connected to the steam distribution cylinder 202.

[0027] like Figure 2 As shown, the cross-section of the through hole 1012 is circular, cross-shaped, or rectangular (various through hole cross-sections are shown in the figure). The cross-section of the molten salt branch pipe 109 is adapted to the through hole 1012. The contact area can be increased according to the actual situation, and it can also be set as an irregular through hole.

[0028] The specific working principle is as follows:

[0029] When the wind and solar power generation equipment 301 has sufficient power, it is prioritized to generate high-temperature steam for industrial use. The electrical energy generated by the wind and solar power generation equipment 301 is supplied to the molten salt electric heater 103 through the distribution box 302. Through the action of the current, the molten salt electric heater 103 converts electrical energy into heat energy. The heat is carried away by the molten salt pump 104 and circulated to the main molten salt pipe 101. The heat is then distributed to the molten salt branch pipe 109 set in the through hole 1012 of the thermal storage brick module 1011, thereby heating the thermal storage brick module 1011. The thermal storage brick module 1011 stores a large amount of thermal energy, solving the problem of on-site consumption of wind and solar power generation. When it is necessary to release the stored heat energy, the water softening device 206 is used to remove calcium and magnesium ions from the water. The water supply pump 205 transports cold water to the thermal deaerator 203 through the medium circulation pipeline and removes oxygen ions after exchanging heat with high-temperature steam. The water supply pump 204 transports the deaerated water to the heat exchanger 201, where high-temperature steam is generated by exchanging heat with high-temperature molten salt. The steam is then transported to the process heat unit through the steam distribution cylinder 202 to meet production needs.

[0030] During off-peak hours at night, the power grid 303 is connected through the distribution box 302, and the molten salt electric heater 103 is driven by a low-cost 10KV high-voltage electric motor. The molten salt electric heater 103 converts electrical energy into heat energy. The heat is carried away by the molten salt pump 104 and circulated to the molten salt main pipe 101. The heat is then distributed to the molten salt branch pipe 109 set in the through hole 1012 of the heat storage brick module 1011, thereby heating the heat storage brick module 1011. The heat storage brick module 1011 stores a large amount of heat energy, and finally converts the low-cost electricity at night into high-temperature heat energy stored in the molten salt heat storage brick composite heat storage unit 1 for the production process needs during the day.

[0031] The salt-free tank 106 is located at a low position. When the system is shut down for a long time or in case of an accident, the salt-free valve is opened and the slope of the pipeline is used to allow the molten salt flowing into the molten salt main pipe 101, the molten salt main pipe 108, the molten salt branch pipe 109, and the molten salt tank 105 to be fed into the salt-free tank 106 by gravity. When the system is restarted, the molten salt in the salt-free tank 106 is melted by the built-in electric heater 110 and then pumped to the molten salt tank 105 by the salt-free pump 107. The molten salt in the system is only used as a circulating heat exchange medium and the amount of molten salt used is small. Compared with the dual-tank molten salt system, this is a significant improvement.

[0032] Using molten salt as the heat transfer medium, compared to solid heat storage which uses a variable frequency fan to drive air circulation and release a large amount of heat energy from the stored heat into the air, and compared to high-temperature air exchanging heat through a finned tube heat exchanger, reduces the fluctuation and instability of the system's heat output. At the same time, it avoids the problems of high failure rate and short lifespan of the built-in electric heating wire in solid heat storage magnesium bricks.

[0033] Example 2

[0034] The difference between this embodiment and Embodiment 1 is that the heat exchange medium is different; this embodiment uses oil as the heat exchange medium. Figure 3 As shown, in this embodiment, the heat exchanger 201 is sequentially connected to the heat transfer oil cooling device 207, the oil-gas separator 210, and the heat transfer oil circulation pump 208. The heat transfer oil circulation pump 208 and the heat transfer oil cooling device 207 are respectively connected to both ends of the heat exchanger 201. The upper port of the oil-gas separator 210 is connected to the high and low level oil storage tank 209 through a pipe.

[0035] Specific work process:

[0036] When the wind and solar power generation equipment 301 has sufficient power, it prioritizes the use of industrial high-temperature heat transfer oil. The electricity generated by the wind and solar power generation equipment 301 supplies power to the molten salt electric heater 103 via the distribution box 302. Through the action of the current, the molten salt electric heater 103 converts electrical energy into heat energy. The heat is carried away by the molten salt pump 104 and circulated to the main molten salt pipe 101, and then distributed to the molten salt branch pipes 109 installed in the thermal storage brick module 1011, thereby heating the thermal storage brick module 1011. The thermal storage brick module 1011 stores a large amount of heat energy, solving the problem of on-site consumption of wind and solar power generation. When it is necessary to release the stored heat energy, the heat transfer oil circulation pump 208 transports low-temperature heat transfer oil to the heat exchanger 201 through the medium circulation pipeline. After exchanging heat with the high-temperature molten salt, high-temperature heat transfer oil is generated and transported to the heat transfer oil cooling device 207 to meet production needs. The oil-gas separator 210 is used to remove water vapor and air from the oil circuit system. The high and low level oil storage tank 209 is mainly used to store the volume of heat transfer oil that expands due to temperature rise, preventing damage to pipelines and valves in the system caused by thermal expansion and pressure rise.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A wind-solar-storage integrated heating system, comprising a wind-solar power generation unit and a heat exchange unit, characterized in that: A molten salt thermal storage brick composite thermal storage unit is installed between the wind and solar power generation unit and the heat exchange unit. The molten salt thermal storage brick composite thermal storage unit includes a molten salt thermal storage mechanism and a thermal storage brick mechanism. The thermal storage brick mechanism includes an insulation shell and several thermal storage brick modules arranged in parallel inside the insulation shell. The thermal storage brick modules have through holes. The molten salt thermal storage mechanism includes a molten salt electric heater connected in series, a molten salt inlet main pipe, several molten salt branch pipes arranged in parallel, a molten salt outlet main pipe, a molten salt tank, and a molten salt pump. The molten salt outlet main pipe is connected to a salt evaporation tank, which is connected to the molten salt tank through the salt evaporation pump. The several molten salt branch pipes arranged in parallel are respectively inserted into the through holes.

2. The integrated wind-solar-storage heating system according to claim 1, characterized in that: The wind and solar power generation unit includes wind and solar power generation equipment and a distribution box. The distribution box is electrically connected to the power grid and electrically connected to the molten salt electric heater.

3. The integrated wind-solar-storage heating system according to claim 1, characterized in that: The heat exchange unit includes a heat exchanger, and the main outlet pipe for molten salt is located inside the heat exchanger.

4. The integrated wind-solar-storage heating system according to claim 3, characterized in that: The heat exchange medium in the heat exchange unit is water. The heat exchange unit also includes a steam distribution cylinder, a thermal deaerator, a feed water pump, a makeup water pump, and a water softening device. The water softening device is connected in series with the makeup water pump. The makeup water pump is connected to the inlet of the thermal deaerator for makeup water to the thermal deaerator. The outlet of the thermal deaerator is connected to the inlet of the heat exchanger through the feed water pump for feeding water to the heat exchanger. The steam supply pipe of the heat exchanger is connected to the thermal deaerator through a circulation pipe. The steam supply pipe of the heat exchanger is connected to the steam distribution cylinder.

5. The integrated wind-solar-storage heating system according to claim 3, characterized in that: The heat exchange medium in the heat exchange unit is oil. The heat exchange unit also includes high and low level oil storage tanks, oil-gas separators, heat transfer oil circulation pumps, and heat transfer oil cooling devices connected in series. A heat exchanger is installed between the heat transfer oil circulation pumps and the heat transfer oil cooling devices.

6. The integrated wind-solar-storage heating system according to claim 1, characterized in that: The cross-section of the through hole is circular, cross-shaped, or rectangular, and the cross-section of the molten salt branch pipe is adapted to the through hole.

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