Cross-seasonal water body heat storage and supply system and method based on abandoned mine pits

Abstract

The invention discloses a cross-seasonal water body heat storage and supply system based on an abandoned mine pit. The cross-seasonal water body heat storage and supply system comprises a solar heat collection device, a cross-seasonal heat storage water body, a heat exchanger, a buffer water tank and a heat consumer. The cross-seasonal heat storage water body is a waste mine pit, the mine pit wall of the cross-seasonal heat storage water body is step-shaped, and a heat storage medium in the cross-seasonal heat storage water body is water; a water inlet of the solar heat collection device is connected with the bottom of the cross-seasonal heat storage water body, a hot water outlet of the solar heat collection device is connected with the upper middle portion of the cross-seasonal heat storage water body, the upper portion of the cross-seasonal heat storage water body is connected with a hot water inlet of the heat exchanger, and a cold water outlet of the heat exchanger is connected with the lower portion of the cross-seasonal heat storage water body. A hot water outlet of the heat exchanger is connected with the buffer water tank through a pipeline, and an outlet of the buffer water tank is connected with a cold water inlet of the heat exchanger. The waste mine pit is used as a cross-seasonal heat storage water body to construct a heat storage and supply system, and green treatment of the waste mine pit and high-proportion utilization of clean energy are achieved.

Description

Technical Field

[0001] The present invention relates to the field of cross-seasonal heating technology, and in particular to a cross-seasonal water body heat storage heating system and a heat storage heating method based on abandoned mines, which utilize the abandoned mines to achieve green management of the abandoned mines and high-proportion utilization of clean energy. Background Art

[0002] Solar energy, as a renewable clean energy, has significant energy-saving and environmental benefits compared to traditional fossil energy. However, due to the uneven seasonal distribution of solar energy, there is a common problem of "insufficient in winter and surplus in summer" in the use of solar energy. Inter-seasonal heat storage technology stores solar energy collected during the non-heating period and uses it during the heating period, which can not only alleviate the above contradictions, but also improve the solar energy guarantee rate and the comprehensive utilization efficiency of solar energy throughout the year. It is an effective way to achieve the continuous and stable operation of the solar heating system.

[0003] At present, the application of solar inter-seasonal heat storage technology is mainly solar energy and underground hot water storage pools for heat storage, which collects and stores heat throughout the year and heats the hot water storage pools in the heating season. The basic principle of inter-seasonal water body heat storage solar district heating technology is to use solar thermal technology to store solar energy in the form of heat in the hot water storage body in the non-heating season, and release the heat stored in the hot water storage body in the heating season to heat the heat users. Large-volume hot water storage body is the key equipment of inter-seasonal water body heat storage solar district heating technology. Large-volume hot water storage bodies are mostly placed underground or semi-underground, and all or part of the bottom and side of the heat storage body are below the ground and directly in contact with the soil. Large-volume hot water storage body has the advantages of low cost, large volume (up to GWh level), fast heat storage and release rate, low heat loss coefficient and inter-seasonal heat storage. It can be combined with a variety of renewable energy technologies such as solar thermal, wind power, photovoltaics, heat pumps, and cogeneration units to fully improve energy utilization and renewable energy absorption capacity, and achieve the goal of clean energy district heating.

[0004] Abandoned mines left after mining activities usually have large underground spaces, which are often idle after mining activities. Transforming abandoned mines into large-volume hot water storage bodies will effectively achieve green management of abandoned mines, directly reduce the construction cost of cross-seasonal water body thermal energy storage solar district heating systems, and significantly improve the level of clean heating technology in Xinjiang mining towns. Open-pit mining will seriously damage the soil structure of the mining area, and the mining process of open-pit mines will cause great damage to the environment. Large-scale mining equipment will cause ground collapse and land cracks during the mining process, resulting in large areas of bare land, further aggravating soil erosion. Open-pit mining will destroy the original ecosystem, leading to a reduction in biodiversity and the destruction of ecological balance. Open-pit mines will also reduce the soil's water and soil conservation capacity, and are more likely to generate dust under the influence of strong winds, causing direct environmental pollution to a large area around the mines. If effective governance measures are not taken, open-pit mines will become a scar on the earth.

[0005] Carrying out ecological governance and large-scale application of green industries for abandoned mines will effectively inhibit the occurrence of land geological disasters around open-pit mines, effectively improve the ecological environment of towns around open-pit mines, and effectively increase the economic value of open-pit mine land. Using abandoned mines to carry out cross-seasonal water body heat storage district heating projects can simultaneously achieve green governance of abandoned mines and high-proportion utilization of clean energy, and significantly reduce carbon emissions from heating in mining areas.

[0006] In view of this, it is necessary to develop a cross-seasonal water heat storage and heating system based on abandoned mines to achieve green management of abandoned mines and high-proportion utilization of clean energy. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a cross-seasonal water body heat storage and heating system and heat storage and heating method based on abandoned mines. The present invention uses abandoned mines as cross-seasonal water body heat storage to construct a heat storage and heating system, realizes green management of abandoned mines and high-proportion utilization of clean energy, and stores the solar energy collected in the non-heating season in the form of thermal energy in the water body for use in the heating season. On the one hand, it can solve the idleness problem of solar thermal collectors in the non-heating season, and on the other hand, it can realize all-weather heating under complex weather conditions, thereby improving the guarantee rate of solar heating.

[0008] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0009] A cross-seasonal water body heat storage and heating system based on an abandoned mine, comprising a solar heat collector, a cross-seasonal hot water storage body, a heat exchanger, a buffer water tank and a heat user end; the cross-seasonal hot water storage body is an abandoned mine, the mine wall of the cross-seasonal hot water storage body is stepped, and the heat storage medium in the cross-seasonal hot water storage body is water;

[0010] The water inlet of the solar thermal collector is connected to the bottom of the inter-seasonal water storage body through a pipeline, the hot water outlet of the solar thermal collector is connected to the middle and upper part of the inter-seasonal water storage body through a pipeline, the upper part of the inter-seasonal water storage body is connected to the hot water inlet of the heat exchanger through a pipeline, the cold water outlet of the heat exchanger is connected to the lower part of the inter-seasonal water storage body through a pipeline, the hot water outlet of the heat exchanger is connected to the buffer water tank through a pipeline, the outlet of the buffer water tank is connected to the cold water inlet of the heat exchanger through a pipeline, and the buffer water tank is connected to the heat user end through a pipeline.

[0011] Furthermore, the inter-seasonal water body heat storage and heating system also includes an air source heat pump and an auxiliary heat source. Two water diverter valves are provided on the pipeline between the buffer water tank and the hot water outlet of the heat exchanger. The water diverter valves are connected to the branch pipelines. The air source heat pump and the auxiliary heat source are respectively connected to the corresponding branch pipelines. The air source heat pump and the auxiliary heat source are arranged in parallel.

[0012] Furthermore, the inter-seasonal water body heat storage and heating system also includes a control device, and the control device is connected to the water diversion valve through a signal.

[0013] Furthermore, the inter-seasonal water body heat storage and heating system also includes a solar thermal power generation device and a solar power generation device. The cold water inlet of the solar thermal power generation device is connected to the bottom of the inter-seasonal water storage body, and the hot water outlet of the solar thermal power generation device is connected to the middle and lower part of the inter-seasonal water storage body. The solar thermal power generation device and the solar power generation device are connected in parallel through a circuit and then connected to the battery. The battery is connected to an inverter, and the inverter is connected to the air source heat pump and the auxiliary heat source through a circuit.

[0014] Furthermore, the inverter is also connected to a power grid via a circuit.

[0015] The method for heat storage and heating using the above system comprises the following steps:

[0016] The cold water at the bottom of the inter-seasonal water storage body is transported to the solar thermal collector for heating, the hot water output from the solar thermal collector is transported to the inter-seasonal water storage body, the hot water in the inter-seasonal water storage body is transported to the heat exchanger through a hot water pump, the cold water in the buffer water tank is transported to the heat exchanger through a cold water pump, and heat is exchanged with the hot water in the heat exchanger, the cold water after heat exchange is transported to the inter-seasonal water storage body, the hot water after heat exchange is transported to the buffer water tank, the hot water is transported from the buffer water tank to the heat user end through a water pump, and the cold water output from the heat user end is transported back to the buffer water tank.

[0017] Furthermore, when the inter-seasonal water storage body provides too little heat energy, the control device controls the water flow through the water diversion valve, and the air source heat pump in the system starts to heat; when the ambient temperature is too low, the auxiliary heat source in the system starts to heat.

[0018] Furthermore, the electricity generated by the solar thermal power generation device and the solar power generation device in the heat storage heating system is stored in the battery through the circuit, and then connected to the inverter through the circuit to convert direct current into alternating current, and then the converted alternating current is transmitted to the air source heat pump and auxiliary heat source in the system through the circuit, and the excess electricity is transmitted to the power grid through the circuit.

[0019] The beneficial effects of the present invention are:

[0020] The present invention utilizes abandoned mines as cross-seasonal hot water storage bodies to construct a heat storage heating system, thereby realizing green management of abandoned mines and high-proportion utilization of clean energy. The solar energy collected in the non-heating season is stored in the hot water storage body in the form of thermal energy for use in the heating season. On the one hand, it can solve the idleness problem of solar energy collectors in the non-heating season, and on the other hand, it can realize all-weather heating in complex weather conditions, thereby improving the guarantee rate of solar energy heating.

[0021] The system of the present invention is a photovoltaic power generation and heating system that can both generate electricity and utilize waste heat for heating. It can output electrical energy while outputting heat energy, thus realizing the comprehensive utilization of energy and improving the overall efficiency of the system.

[0022] The inter-seasonal hot water storage body used in this system is an abandoned mine with a nearly stepped wall, which realizes the reuse of abandoned space. Using the larger underground space of the abandoned mine for inter-seasonal water heat storage can effectively utilize waste resources and avoid the waste of land resources. The larger underground space of the abandoned mine can accommodate a large amount of water for heat storage. This large-scale heat storage method can meet the heating needs of cities or regions. Moreover, abandoned mines often retain a large amount of groundwater or mine water. Compared with surface water, groundwater has better thermal insulation performance, which is conducive to the long-term storage and stable release of heat. At the same time, using groundwater for heat storage can also reduce water evaporation and save water resources. In addition, the geological structure of the mine can also provide a certain insulation effect for the heat storage system.

[0023] The present invention utilizes abandoned mines for inter-seasonal water heat storage, and can utilize renewable energy (such as solar energy, etc.) to collect and store heat, thereby reducing fossil energy consumption and pollutant emissions. Abandoned mines often cause damage to the ecological environment during the mining process, such as vegetation destruction, soil erosion, etc.; through the implementation of inter-seasonal water heat storage, the mines can be ecologically restored and greened, and the ecological environment of the mines and surrounding areas can be improved. Furthermore, inter-seasonal water heat storage technology can store excess heat in the summer and release it in the winter for heating; this method can significantly reduce energy consumption and costs during the heating season and improve energy utilization efficiency. In addition, the reuse of abandoned mines can also drive the development of related industries, such as the manufacture, installation, and maintenance of heat storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-seasonal water heat storage and heating system based on abandoned mines of the present invention.

[0025] In the figure, 1: solar thermal collector; 2: solar thermal collector power generation device; 3: solar power generation device; 4: cross-seasonal hot water storage body; 5: heat exchanger; 6: air source heat pump; 7: auxiliary heat source; 8: buffer water tank; 9: heat user end; 10: control device; 11: battery; 12: inverter; 13: power grid; 14: water diversion valve. DETAILED DESCRIPTION

[0026] The technical solutions in the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 A preferred embodiment of an inter-seasonal water body heat storage and heating system based on an abandoned mine is shown, which comprises a solar heat collector 1, an inter-seasonal hot water storage body 4, a heat exchanger 5, a buffer water tank 8 and a heat user terminal 9; the inter-seasonal hot water storage body 4 is an abandoned mine, and the mine wall of the inter-seasonal hot water storage body 4 is stepped, and the heat storage medium in the inter-seasonal hot water storage body 4 is water;

[0028] The water inlet of the solar thermal collector 1 is connected to the bottom of the cross-seasonal water storage body 4 through a pipeline, and a water pump is provided on the pipeline; the hot water outlet of the solar thermal collector 1 is connected to the middle and upper part of the cross-seasonal water storage body 4 through a pipeline, the upper part of the cross-seasonal water storage body 4 is connected to the hot water inlet of the heat exchanger 5 through a pipeline, the cold water outlet of the heat exchanger 5 is connected to the lower part of the cross-seasonal water storage body 4 through a pipeline, and a cold water pump is provided on the pipeline between the cold water outlet of the heat exchanger 5 and the cross-seasonal water storage body 4, the hot water outlet of the heat exchanger 5 is connected to the buffer water tank 8 through a pipeline, the outlet of the buffer water tank 8 is connected to the cold water inlet of the heat exchanger 5 through a pipeline, and a cold water pump is provided on the pipeline between the buffer water tank 8 and the cold water inlet of the heat exchanger 5, the buffer water tank 8 is connected to the heat user end 9 through a pipeline, and a hot water pump is provided on the pipeline between the buffer water tank 8 and the heat user end 9.

[0029] The inter-seasonal water body heat storage and heating system also includes an air source heat pump 6 and an auxiliary heat source 7. Two water diverter valves 14 are provided on the pipeline between the buffer water tank 8 and the hot water outlet of the heat exchanger 5. The water diverter valve 14 is connected to a branch pipeline. The air source heat pump 6 and the auxiliary heat source 7 are respectively connected to the corresponding branch pipelines. The air source heat pump 6 and the auxiliary heat source 7 are arranged in parallel.

[0030] The inter-seasonal water body heat storage and heating system further comprises a control device 10 , and the control device 10 is connected to the water diversion valve 14 via a signal.

[0031] The inter-seasonal water body heat storage and heating system also includes a solar thermal power generation device 2 and a solar power generation device 3, the cold water inlet of the solar thermal power generation device 2 is connected to the bottom of the inter-seasonal hot water storage body 4, the hot water outlet of the solar thermal power generation device 2 is connected to the middle and lower part of the inter-seasonal hot water storage body 4, the solar thermal power generation device 2 and the solar power generation device 3 are connected in parallel through a circuit and connected to the storage battery 11, the storage battery 11 is connected to an inverter 12, and the inverter 12 is connected to the air source heat pump 6 and the auxiliary heat source 7 through a circuit. The inverter 12 is also connected to the power grid 13 through a circuit.

[0032] The method for heat storage and heating using the above system comprises the following steps:

[0033] The cold water at the bottom of the abandoned inter-seasonal hot water storage body 4 is transported to the solar thermal collector 1 and the solar thermal power generation device 2 for heating by a water pump, and then the hot water is transported to the middle and upper part and the middle and lower part of the inter-seasonal hot water storage body 4 according to different temperatures. The hot water in the inter-seasonal hot water storage body 4 is transported to the heat exchanger 5 by a hot water pump, and the cold water in the buffer water tank 8 is transported to the heat exchanger 5 by a cold water pump to exchange heat with the hot water in the heat exchanger 5. The cold water after heat exchange is transported to the inter-seasonal hot water storage body 4, and the hot water after heat exchange is transported to the buffer water tank 8. The hot water is transported from the buffer water tank 8 to the heat user end 9 by a hot water pump, and the cold water output by the heat user end 9 is transported back to the buffer water tank 8.

[0034] The control device 10 is connected to each water diversion valve and water pump to control the opening and closing of the water diversion valve and the switching of each water pump. When the inter-seasonal hot water storage body provides too little heat energy, the control device 10 controls the water flow through the water diversion valve 14, and the air source heat pump 6 in the system starts to heat the water; when the ambient temperature is too low, the auxiliary heat source 7 in the system starts to heat the water to ensure the temperature of the hot water supplied to the heat user end 9.

[0035] The electricity generated by the solar thermal power generation device 2 and the solar power generation device 3 is stored in the storage battery 11 through the circuit, and then connected to the inverter 12 through the circuit to convert the direct current into alternating current. The converted alternating current is then transmitted to the air source heat pump 6 and the auxiliary heat source 7 through the circuit to supply power to the air source heat pump 6 and the auxiliary heat source 7, and the excess electricity is transmitted to the power grid 13 through the circuit.

[0036] In this system, the solar thermal collector 1 and the solar thermal power generation device 2 collect solar energy, while the solar thermal power generation device 2 and the solar power generation device 3 generate electric energy. The collected thermal energy is stored in the inter-seasonal hot water storage body 4, and the electric energy can be stored in the battery 11, so as to realize the coexistence of electricity and heat; wherein, the electric energy storage needs to be proportioned according to the load for the battery capacity. When heating is needed, the heat energy of the inter-seasonal hot water storage body 4 is transferred to the heat user end 9 after heat exchange through the heat exchanger 5; the air source heat pump 6 and the auxiliary heat source 7 provide supplementary heat energy, and the power supply of the air source heat pump 6 and the auxiliary heat source 7 are both provided by the solar thermal power generation device 2 and the solar power generation device 3, and the excess electric energy is provided to the power grid 13 to meet the all-round energy demand of the system.

[0037] The present invention utilizes abandoned mines as cross-seasonal hot water storage bodies to construct a heat storage heating system, thereby realizing green management of abandoned mines and high-proportion utilization of clean energy. The solar energy collected in the non-heating season is stored in the hot water storage body in the form of thermal energy for use in the heating season. On the one hand, it can solve the idleness problem of solar energy collectors in the non-heating season, and on the other hand, it can realize all-weather heating in complex weather conditions, thereby improving the guarantee rate of solar energy heating.

[0038] The system of the present invention is a photovoltaic power generation and heating system that can both generate electricity and utilize waste heat for heating. It can output electrical energy while outputting heat energy, thus realizing the comprehensive utilization of energy and improving the overall efficiency of the system.

[0039] The inter-seasonal hot water storage body used in this system is an abandoned mine with a nearly stepped wall, which realizes the reuse of abandoned space. Using the larger underground space of the abandoned mine for inter-seasonal water heat storage can effectively utilize waste resources and avoid the waste of land resources. The larger underground space of the abandoned mine can accommodate a large amount of water for heat storage. This large-scale heat storage method can meet the heating needs of cities or regions. Moreover, abandoned mines often retain a large amount of groundwater or mine water. Compared with surface water, groundwater has better thermal insulation performance, which is conducive to the long-term storage and stable release of heat. At the same time, using groundwater for heat storage can also reduce water evaporation and save water resources. In addition, the geological structure of the mine can also provide a certain insulation effect for the heat storage system.

[0040] The present invention utilizes abandoned mines for inter-seasonal water heat storage, and can utilize renewable energy (such as solar energy, etc.) to collect and store heat, thereby reducing fossil energy consumption and pollutant emissions. Abandoned mines often cause damage to the ecological environment during the mining process, such as vegetation destruction, soil erosion, etc.; through the implementation of inter-seasonal water heat storage, the mines can be ecologically restored and greened, and the ecological environment of the mines and surrounding areas can be improved. Furthermore, inter-seasonal water heat storage technology can store excess heat in the summer and release it in the winter for heating; this method can significantly reduce energy consumption and costs during the heating season and improve energy utilization efficiency. In addition, the reuse of abandoned mines can also drive the development of related industries, such as the manufacture, installation, and maintenance of heat storage equipment.

[0041] The system of the present invention adopts all-solar cross-season heat storage technology, which can adopt a variety of heat storage forms, such as water tank heat storage, aquifer heat storage, underground pipeline heat storage, phase change heat storage, etc. These forms have their own advantages and can be flexibly selected according to actual conditions to improve heat storage efficiency and system performance.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cross-seasonal water heat storage and heating system based on abandoned mines, It is characterized in that It includes a solar heat collecting device, a cross-seasonal hot water storage body, a heat exchanger, a buffer water tank and a heat user end; the cross-seasonal hot water storage body is an abandoned mine pit, and the mine pit wall of the cross-seasonal hot water storage body is stepped, and the heat storage medium in the cross-seasonal hot water storage body is water; The water inlet of the solar thermal collector is connected to the bottom of the inter-seasonal water storage body through a pipeline, the hot water outlet of the solar thermal collector is connected to the middle and upper part of the inter-seasonal water storage body through a pipeline, the upper part of the inter-seasonal water storage body is connected to the hot water inlet of the heat exchanger through a pipeline, the cold water outlet of the heat exchanger is connected to the lower part of the inter-seasonal water storage body through a pipeline, the hot water outlet of the heat exchanger is connected to the buffer water tank through a pipeline, the outlet of the buffer water tank is connected to the cold water inlet of the heat exchanger through a pipeline, and the buffer water tank is connected to the heat user end through a pipeline.

2. According to claim 1, a cross-seasonal water body heat storage and heating system based on an abandoned mine, It is characterized in that It also includes an air source heat pump and an auxiliary heat source. Two water diverter valves are provided on the pipeline between the buffer water tank and the hot water outlet of the heat exchanger. The water diverter valves are connected to the branch pipelines. The air source heat pump and the auxiliary heat source are respectively connected to the corresponding branch pipelines. The air source heat pump and the auxiliary heat source are arranged in parallel.

3. According to claim 2, a cross-seasonal water body heat storage and heating system based on an abandoned mine, It is characterized in that It also includes a control device, which is connected to the water diversion valve through a signal.

4. According to claim 2, a cross-seasonal water body heat storage and heating system based on an abandoned mine, It is characterized in that It also includes a solar thermal power generation device and a solar power generation device, the cold water inlet of the solar thermal power generation device is connected to the bottom of the inter-seasonal hot water storage body, the hot water outlet of the solar thermal power generation device is connected to the middle and lower part of the inter-seasonal hot water storage body, the solar thermal power generation device and the solar power generation device are connected in parallel through a circuit and then connected to the battery, the battery is connected to an inverter, and the inverter is connected to the air source heat pump and the auxiliary heat source through a circuit.

5. According to claim 4, a cross-seasonal water body heat storage and heating system based on an abandoned mine, It is characterized in that The inverter is also connected to the power grid through a circuit.

6. A cross-seasonal water body heat storage and heating method based on abandoned mines, It is characterized in that Using the system according to any one of claims 1 to 5 to perform heat storage and heating comprises the following steps: The cold water at the bottom of the inter-seasonal water storage body is transported to the solar thermal collector for heating, the hot water output from the solar thermal collector is transported to the inter-seasonal water storage body, the hot water in the inter-seasonal water storage body is transported to the heat exchanger through a water pump, the cold water in the buffer water tank is transported to the heat exchanger through a water pump, and heat is exchanged with the hot water in the heat exchanger, the cold water after heat exchange is transported to the inter-seasonal water storage body, the hot water after heat exchange is transported to the buffer water tank, the hot water is transported from the buffer water tank to the heat user end through a water pump, and the cold water output from the heat user end is transported back to the buffer water tank.

7. A cross-seasonal water body heat storage and heating method based on abandoned mines according to claim 6, It is characterized in that When the inter-seasonal water storage body provides too little heat energy, the control device controls the water flow through the water diversion valve, and the air source heat pump in the system starts to heat; when the ambient temperature is too low, the auxiliary heat source in the system starts to heat.

8. A cross-seasonal water body heat storage and heating method based on abandoned mines according to claim 6, It is characterized in that The solar thermal power generation device and the electricity generated by the solar power generation device in the heat storage heating system are stored in the battery through the circuit, and then connected to the inverter through the circuit to convert direct current into alternating current. The converted alternating current is then transmitted to the air source heat pump and auxiliary heat source in the system through the circuit, and the excess electricity is transmitted to the power grid through the circuit.

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