An electric heating heat transfer oil thermal energy storage system

Abstract

The present invention discloses an electric heating heat-conducting oil heat storage system, which includes an electric heating heat-conducting oil furnace (10), a heat-conducting oil heat storage device (20), an oil-gas separator (30) and an expansion tank (40) that are connected in sequence. The electric heating heat-conducting oil furnace (10) can heat the heat-conducting oil. The heat-conducting oil in the electric heating heat-conducting oil furnace (10) can enter the heat-conducting oil heat storage device (20). The heat-conducting oil in the expansion tank (40) can enter the heat-conducting oil heat storage device (20). The expansion tank (40) is located above the heat-conducting oil heat storage device (20). The heat-conducting oil heat storage device (20) is connected with a hot oil supply user pipeline (61) and a user cold oil return pipeline (62). This electric heating heat-conducting oil heat storage system uses heat-conducting oil as the heat storage medium and electric energy as the heat source, and uses an electric heating heat-conducting oil furnace to replace a conventional fuel combustion heat-conducting oil furnace, avoiding pollutant emissions.

Description

Technical Field

[0001] The present invention relates to an electric heating heat-conducting oil heat storage system. Background Art

[0002] Traditional heating methods mainly obtain heat energy by fuel combustion. Fuel combustion will produce a large amount of pollutants. With the country's emphasis on environmental protection, the requirements for emission indicators are becoming more and more stringent, the cost of pollutant treatment is gradually increasing, and production enterprises are increasingly inclined to easily obtained, clean, and efficient electric energy.

[0003] Compared with fuel combustion heating, the electric energy heating system is simpler. For heating conditions with intermittent heat supply or a large range of heat load changes, directly heating a medium with a large volume (such as gas, steam, etc.) by electric heating equipment will cause equipment burnout or shortened lifespan. As a heat carrier, heat-conducting oil has the advantages of no corrosion, low vapor pressure, relatively small specific volume, and high operating temperature under normal pressure. It is widely used as an intermediate heat medium in heat-conducting oil furnaces for chemical production and mold manufacturing and in the field of solar energy utilization. In recent years, more research has been conducted on electric heating heat-conducting oil technology and applications, but it is only limited to the application of small-load steady-state conditions in the chemical industry and mold manufacturing industry, and has not been applied more in large-scale practices.

[0004] When an electric heating heat-conducting oil furnace supplies heat to three heat-using devices, the return oil temperature and pressure of the three heat-using devices are balanced by setting a balance pipe, and then the oil is collected by the main pipe and returned to the heat-conducting oil furnace for heating. For intermittent or variable-load operating conditions, the three heat-using devices affect each other, and the heating parameters cannot be guaranteed. In addition, due to the inconsistent resistance losses of the pipeline systems of the three heat-using devices, after the balance pressure at the end of the return oil, the oil system with large resistance loss will have poor circulation, the heat transfer intensity will be weakened, and the heating quality cannot be guaranteed.

[0005] Using heat-conducting oil as a heat carrier and then using a heat pipe heat exchanger to indirectly convert electric energy into the heat energy of cold air for heating, the system increases the number of heat transfer stages, not only has low heat transfer efficiency, but also has a complex structure of the system equipment. By setting heating electrodes in the heat storage tank and mixing hot and cold oil by means of a stirrer, the flow rate requirement of more than 1.5 m / s of the heat-conducting oil on the electrode surface cannot be achieved, and the heat-conducting oil is prone to over-temperature cracking on the electrode surface. Summary of the Invention

[0006] In order to realize heat supply with heat-conducting oil as an intermediate heat transfer medium, the present invention provides an electric heating heat-conducting oil heat storage system. This electric heating heat-conducting oil heat storage system uses heat-conducting oil as a heat storage medium, converts electric energy into heat energy by heating heat-conducting oil, stores the heat energy in the heat-conducting oil, and supplies it to heat users. Using electric energy as a heat source and replacing a conventional fuel combustion heat-conducting oil furnace with an electric heating heat-conducting oil furnace can avoid pollutant emissions.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: An electric heating heat-conducting oil heat storage system includes an electric heating heat-conducting oil furnace, a heat-conducting oil heat storage device, an oil-gas separator, and an expansion tank connected in sequence. The electric heating heat-conducting oil furnace can heat the heat-conducting oil. The heat-conducting oil in the electric heating heat-conducting oil furnace can enter the heat-conducting oil heat storage device. The heat-conducting oil in the heat-conducting oil heat storage device can enter the oil-gas separator. The heat-conducting oil in the oil-gas separator can enter the electric heating heat-conducting oil furnace. The gas in the oil-gas separator can enter the expansion tank. The heat-conducting oil in the expansion tank can enter the heat-conducting oil heat storage device. The expansion tank is located above the heat-conducting oil heat storage device. The heat-conducting oil heat storage device is connected with a hot oil supply user pipeline and a user cold oil return pipeline.

[0008] The heat-conducting oil heat storage device is provided with a first oil inlet, a second oil inlet, a first oil outlet, a second oil outlet, a hot oil supply port, and a cold oil return port. The hot oil supply user pipeline is connected to the hot oil supply port, and the user cold oil return pipeline is connected to the cold oil return port.

[0009] The first oil inlet, the second oil inlet, and the first oil outlet are all located in the upper part of the heat-conducting oil heat storage device. The second oil outlet, the hot oil supply port, and the cold oil return port are all located in the lower part of the heat-conducting oil heat storage device. A supply oil pump is provided on the hot oil supply user pipeline.

[0010] The electric heating heat-conducting oil furnace is provided with an electric heater. The electric heater can heat the heat-conducting oil in the electric heating heat-conducting oil furnace. The outlet of the electric heating heat-conducting oil furnace is connected to the first oil inlet of the heat-conducting oil heat storage device through a first oil pipeline.

[0011] The expansion tank is provided with a liquid inlet, a gas inlet, and a liquid outlet. The liquid inlet and the gas inlet are both located in the upper part of the expansion tank, and the liquid outlet is located in the lower part of the expansion tank.

[0012] The liquid outlet of the expansion tank is connected to the second oil inlet of the heat-conducting oil heat storage device through a second oil pipeline. The second oil pipeline is in an inclined state. The gas outlet of the oil-gas separator is connected to the gas inlet of the expansion tank through an exhaust pipeline.

[0013] The first oil outlet of the heat-conducting oil heat storage device is connected to the inlet of the oil-gas separator through a third oil pipeline. The liquid outlet of the oil-gas separator is connected to the inlet of the electric heating heat-conducting oil furnace through a fourth oil pipeline. A circulation pump is provided on the fourth oil pipeline.

[0014] The electric heating heat-conducting oil heat storage system further includes a heat medium storage tank and an oil injection main pipeline. The heat medium storage tank is provided with a first oil inlet, a second oil inlet, a first oil outlet, and a second oil outlet. The heat-conducting oil in the heat-conducting oil heat storage device can enter the heat medium storage tank. The heat-conducting oil in the heat medium storage tank can enter the expansion tank. The heat-conducting oil in the oil injection main pipeline can enter the heat medium storage tank, and the heat-conducting oil in the oil injection main pipeline can also enter the expansion tank.

[0015] A first valve, an oil injection pump, and a second valve are sequentially provided on the main oil injection pipeline. The main oil injection pipeline is connected to the liquid inlet of the expansion tank through a first oil injection branch line. The connection between the first oil injection branch line and the main oil injection pipeline is located between the oil injection pump and the second valve. The first oil injection branch line is connected to the first oil inlet of the heat medium storage tank through a second oil injection branch line, and a third valve is provided on the second oil injection branch line.

[0016] The position of the heat medium storage tank is lower than that of the heat transfer oil heat storage device. The second oil inlet of the heat medium storage tank is connected to the second oil discharge port of the heat transfer oil heat storage device through a fifth oil pipeline, and a fourth valve is provided on the fifth oil pipeline. The first oil outlet of the heat medium storage tank is externally connected to a first oil discharge branch line. The second oil outlet of the heat medium storage tank is connected to the main oil injection pipeline through a second oil discharge branch line. The connection between the second oil discharge branch line and the main oil injection pipeline is located between the first valve and the oil injection pump.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. An electric heating heat transfer oil furnace is used to replace a conventional fuel combustion heat transfer oil furnace, avoiding the emission of combustion pollutants.

[0019] 2. Heat transfer oil is used as the heat storage medium, and valley electricity can be used to heat the heat transfer oil to supply heat to heat users, reducing the electricity cost and the power load during peak hours.

[0020] 3. The electric heating heat transfer oil furnace and the heat transfer oil heat storage device are independently arranged, and in the forced flow mode of the circulation pump, the heat transfer between the electric heating body and the heat transfer oil is strengthened, ensuring that the oil film on the surface of the electric heating body will not undergo over-temperature cracking.

[0021] 4. A large-capacity heat transfer oil heat storage device is adopted, which can enable the heat transfer oil furnace to stably store heat in the heat storage device at an average heat load during the heating period, avoiding large-range fluctuations in the load of the electric heater of the heat transfer oil furnace and even frequent start-stop.

[0022] 5. A large-capacity heat transfer oil heat storage device is adopted, which can ensure the instantaneous maximum heat load demand of heat users and meet the continuous or intermittent heat supply system of heat users.

[0023] 6. A large-capacity heat transfer oil heat storage device is adopted, enabling each heat user to independently set an oil supply pump, avoiding interference between heat users with different parameters and ensuring the heat supply quality.

[0024] 7. The constant pressure method of a high-position expansion tank is adopted. The high-position expansion tank and the heat transfer oil heat storage device are connected through a pipeline to meet the constant pressure requirements of the circulation pump and the oil supply pump. At the same time, the effective storage volume of the heat transfer oil heat storage device is maximized. The expansion tank ensures that the oil temperature in the tank does not exceed 60 °C by dissipating heat to the outside, preventing high-temperature oxidation of the hot oil.

[0025] 8. Install an oil-gas separator to remove the gas in the return oil of the electric heating heat-conducting oil furnace, and avoid the cracking of the oil film caused by poor heat exchange in the furnace.

[0026] 9. Install a heat medium storage tank to effectively store the heat-conducting oil in the system in case of special circumstances and supplement the oil into the system during normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0028] Figure 1 It is a schematic diagram of the electric heating heat-conducting oil heat storage system described in the present invention.

[0029] Figure 2 It is a schematic diagram of the electric heating heat-conducting oil furnace.

[0030] Figure 3 It is a schematic diagram of the heat-conducting oil heat storage device.

[0031] Figure 4 It is a schematic diagram of the oil-gas separator.

[0032] Figure 5 It is a schematic diagram of the expansion tank.

[0033] Figure 6 It is a schematic diagram of the heat medium storage tank.

[0034] 10. Electric heating heat-conducting oil furnace; 20. Heat-conducting oil heat storage device; 30. Oil-gas separator; 40. Expansion tank; 50. Heat medium storage tank;

[0035] 11. Electric heater; 12. Power supply;

[0036] 21. First oil inlet; 22. Second oil inlet; 23. First oil drain port; 24. Second oil drain port; 25. Hot oil supply port; 26. Cold oil return port;

[0037] 41. Liquid inlet; 42. Gas inlet; 43. Liquid outlet; 44. Exhaust pipe;

[0038] 51. First oil inlet; 52. Second oil inlet; 53. First oil outlet; 54. Second oil outlet;

[0039] 61. Hot oil supply user pipeline; 62. User cold oil return pipeline; 63. Oil supply pump;

[0040] 71. First oil pipeline; 72. Second oil pipeline; 73. Third oil pipeline; 74. Fourth oil pipeline; 75. Fifth oil pipeline; 76. Circulation pump; 77. Exhaust pipeline;

[0041] 80. Oil injection main pipeline; 81. First valve; 82. Oil injection pump; 83. Second valve; 84. First oil injection branch line; 85. Second oil injection branch line; 86. First oil drainage branch line; 87. Second oil drainage branch line; 88. Third valve; 89. Fourth valve; 810. Fifth valve; 811. Sixth valve. Detailed implementation manners

[0042] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0043] An electric heating heat-conducting oil heat storage system includes an electric heating heat-conducting oil furnace 10, a heat-conducting oil heat storage device 20, an oil-gas separator 30, and an expansion tank 40 that are sequentially connected through pipelines. The electric heating heat-conducting oil furnace 10 can heat the heat-conducting oil in the electric heating heat-conducting oil furnace 10. The heat-conducting oil in the electric heating heat-conducting oil furnace 10 can enter the heat-conducting oil heat storage device 20. The heat-conducting oil in the heat-conducting oil heat storage device 20 can enter the oil-gas separator 30. The heat-conducting oil in the oil-gas separator 30 can enter the electric heating heat-conducting oil furnace 10. The gas in the oil-gas separator 30 can enter the expansion tank 40. The heat-conducting oil in the expansion tank 40 can enter the heat-conducting oil heat storage device 20. The expansion tank 40 is located above the heat-conducting oil heat storage device 20. The heat-conducting oil heat storage device 20 is connected with at least one hot oil supply user pipeline 61 and at least one user cold oil return pipeline 62, as Figures 1 to 6 shown.

[0044] In the present invention, heat-conducting oil is used as the heat storage medium, and electric energy is converted into heat energy by heating the heat-conducting oil electrically and stored in the heat-conducting oil for use by heat users. The present invention uses electric energy as the heat source and adopts the electric heating heat-conducting oil furnace 10 to replace the conventional fuel combustion heat-conducting oil furnace, avoiding pollutant emissions.

[0045] The present invention independently sets the electric heating heat-conducting oil furnace 10 and the heat-conducting oil heat storage device 20, and uses the circulation pump 76 to force the flow, strengthening the heat exchange between the electric heater 11 and the heat-conducting oil to ensure that the oil film on the surface of the electric heater 11 will not undergo over-temperature cracking. A large-capacity heat-conducting oil heat storage device 20 is adopted to store heat using valley electricity, reducing the electricity cost and the power load during peak hours. By adopting a large-capacity heat-conducting oil heat storage device 20, the electric heating heat-conducting oil furnace 10 stably stores heat in the heat-conducting oil heat storage device 20 with an average heat load during the heating period, avoiding large-range fluctuations in the load of the electric heater of the electric heating heat-conducting oil furnace 10 and even frequent start-stop.

[0046] Adopt a large-capacity heat-conducting oil heat storage device 20 to ensure the instantaneous maximum heat load demand of heat users and meet the continuous or intermittent heat supply system of heat users. Each heat user is independently provided with an oil supply pump 63, which avoids interference between heat users with different parameters and ensures the heat supply quality. The constant pressure method of the high-position expansion tank 40 is adopted, and the high-position expansion tank 40 is connected to the heat-conducting oil heat storage device 20 through a pipeline, which meets the constant pressure requirements of the circulation pump 76 and the oil supply pump 63, and at the same time maximizes the effective storage volume of the heat-conducting oil heat storage device 20.

[0047] In this embodiment, the heat-conducting oil heat storage device 20 can adopt an existing technology product. The heat-conducting oil heat storage device 20 includes a first oil inlet 21, a second oil inlet 22, a first oil outlet 23, a second oil outlet 24, a hot oil supply port 25 and a cold oil return port 26. The number of the hot oil supply ports 25 and the number of the cold oil return ports 26 can be determined according to needs. The hot oil supply user pipeline 61 is connected to the hot oil supply port 25, and the user cold oil return pipeline 62 is connected to the cold oil return port 26.

[0048] In this embodiment, the first oil inlet 21, the second oil inlet 22 and the first oil outlet 23 are all located in the upper part of the heat-conducting oil heat storage device 20, and the second oil outlet 24, the hot oil supply port 25 and the cold oil return port 26 are all located in the lower part of the heat-conducting oil heat storage device 20. An oil supply pump 63 is provided on the hot oil supply user pipeline 61. The number of the hot oil supply ports 25 is the same as the number of the cold oil return ports 26, and the number of the hot oil supply user pipelines 61 is the same as the number of the user cold oil return pipelines 62, as Figure 1 and Figure 3 shown.

[0049] In this embodiment, the electric heating heat-conducting oil furnace 10 can adopt an existing technology product. The electric heating method of the electric heating heat-conducting oil furnace 10 is not limited to resistance or electromagnetic induction heating. The electric heating heat-conducting oil furnace 10 includes an electric heater 11, and the electric heater 11 is connected to a power supply 12. The electric heater 11 can heat the heat-conducting oil in the electric heating heat-conducting oil furnace 10. The outlet of the electric heating heat-conducting oil furnace 10 is connected to the first oil pipeline 71 and then to the first oil inlet 21 of the heat-conducting oil heat storage device 20.

[0050] In this embodiment, the expansion tank 40 can adopt an existing technology product. The expansion tank 40 is of a tank structure. The expansion tank 40 includes a liquid inlet 41, a gas inlet 42 and a liquid outlet 43. The liquid inlet 41 and the gas inlet 42 are both located in the upper part of the expansion tank 40, and the liquid outlet 43 is located in the lower part of the expansion tank 40. An exhaust pipe 44 is also connected to the upper part of the expansion tank 40.

[0051] In this embodiment, the liquid outlet 43 of the expansion tank 40 is connected to the second oil inlet 22 of the heat-conducting oil heat storage device 20 through the second oil pipeline 72. The second oil pipeline 72 is in an inclined state, and the inclination angle of the second oil pipeline 72 can be determined as needed. The gas outlet of the oil-gas separator 30 is connected to the gas inlet 42 of the expansion tank 40 through the exhaust pipeline 77. The expansion tank 40 dissipates heat to the outside to ensure that the oil temperature in the tank does not exceed 60 °C, preventing high-temperature oxidation of the hot oil.

[0052] In this embodiment, the first oil drain port 23 of the heat-conducting oil heat storage device 20 is connected to the inlet of the oil-gas separator 30 through the third oil pipeline 73. The liquid outlet of the oil-gas separator 30 is connected to the inlet of the electric heating heat-conducting oil furnace 10 through the fourth oil pipeline 74, and a circulation pump 76 is provided on the fourth oil pipeline 74. The oil-gas separator 30 is provided to remove the gas in the return oil of the electric heating heat-conducting oil furnace 10, avoiding the cracking of the oil film caused by poor heat exchange.

[0053] In this embodiment, the electric heating heat-conducting oil heat storage system further includes a heat medium storage tank 50 and an oil injection main pipeline 80. The heat medium storage tank 50 is provided with a first oil inlet 51, a second oil inlet 52, a first oil outlet 53, and a second oil outlet 54. The heat-conducting oil in the heat-conducting oil heat storage device 20 can enter the heat medium storage tank 50, the heat-conducting oil in the heat medium storage tank 50 can enter the expansion tank 40, the heat-conducting oil in the oil injection main pipeline 80 can enter the heat medium storage tank 50, and the heat-conducting oil in the oil injection main pipeline 80 can also enter the expansion tank 40. The heat medium storage tank 50 is provided to ensure that the heat-conducting oil in the heat-conducting oil heat storage device 20 is drained into it or the heat-conducting oil is replenished to the heat-conducting oil heat storage device 20 in case of an accident.

[0054] In this embodiment, a first valve 81, an oil injection pump 82, and a second valve 83 are sequentially provided on the oil injection main pipeline 80 along the direction from the inlet to the outlet. The oil injection main pipeline 80 is connected to the liquid inlet 41 of the expansion tank 40 through a first oil injection branch line 84. The connection point of the first oil injection branch line 84 and the oil injection main pipeline 80 is located between the oil injection pump 82 and the second valve 83. The first oil injection branch line 84 is connected to the first oil inlet 51 of the heat medium storage tank 50 through a second oil injection branch line 85, and a third valve 88 is provided on the second oil injection branch line 85.

[0055] In this embodiment, the position of the heat medium storage tank 50 is lower than that of the heat-conducting oil heat storage device 20. The second oil inlet 52 of the heat medium storage tank 50 is connected to the second oil discharge port 24 of the heat-conducting oil heat storage device 20 through the fifth oil pipeline 75. A fourth valve 89 is provided on the fifth oil pipeline 75. An external connection of the first oil outlet 53 of the heat medium storage tank 50 is provided with a first oil discharge branch pipeline 86, and a sixth valve 811 is provided on the first oil discharge branch pipeline 86. The second oil outlet 54 of the heat medium storage tank 50 is connected to the oil injection main pipeline 80 through the second oil discharge branch pipeline 87. A fifth valve 810 is provided on the second oil discharge branch pipeline 87. The connection between the second oil discharge branch pipeline 87 and the oil injection main pipeline 80 is located between the first valve 81 and the oil injection pump 82.

[0056] The working process of this electric heating heat-conducting oil heat storage system is introduced below.

[0057] The heat-conducting oil in the heat-conducting oil heat storage device 20 is sent into the electric heating heat-conducting oil furnace 10 through the circulating pump 76 after removing gas by the oil-gas separator 30 for heating and temperature rise. The heat-conducting oil after reaching a certain temperature then returns to the heat-conducting oil heat storage device 20. In this way, the heat-conducting oil in the heat-conducting oil heat storage device 20 is gradually heated and stored in heat. The high-temperature heat-conducting oil in the heat-conducting oil heat storage device 20 supplies heat to heat users through the hot oil supply user pipeline 61 and the oil supply pump 63. The heat-conducting oil that releases heat is sent into the heat-conducting oil heat storage device 20 through the user cold oil return pipeline 62 to be heated again.

[0058] The electric heating heat-conducting oil furnace 10 can adopt the resistance heating method or the electromagnetic induction heating method, and the heat load is adjusted in multiple gears. The oil tanker or barreled oil is connected to the inlet of the oil injection main pipeline 80. The heat-conducting oil can be directly injected into the heat-conducting oil heat storage device 20 through the oil injection pump 82, or can be injected into the heat medium storage tank 50. When oil needs to be replenished, it is injected into the expansion tank 40.

[0059] The heat-conducting oil in the heat medium storage tank 50 can be injected into the heat-conducting oil heat storage device 20 through the oil injection pump 82. When the system replenishes oil, it is injected into the expansion tank 40. The heat-conducting oil in the heat-conducting oil heat storage device 20 can be introduced into the heat medium storage tank 50, and the heat-conducting oil in the expansion tank 40 can be introduced into the heat medium storage tank 50 through the heat-conducting oil heat storage device 20. When the heat-conducting oil in the heat medium storage tank 50 needs to be transported out, it can be injected into the oil tanker or oil barrel by using the oil injection pump 82. A small amount of residual oil at a low position can be recovered through the drain pipe (i.e., the first oil discharge branch pipeline 86).

[0060] The installation position of the expansion tank 40 is higher than that of the heat-conducting oil heat storage device 20 to ensure that the heat-conducting oil at the inlets of the circulating pump 76 and the oil supply pump 63 does not vaporize. The installation position of the heat medium storage tank 50 is lower than that of the heat-conducting oil heat storage device 20, which is convenient for the heat-conducting oil to flow back to the heat medium storage tank 50. Usually, the heat medium storage tank 50 and the oil injection pump 82 are installed on the ground, or can also be installed in a pit. The effective volume of the heat medium storage tank 50 is larger than the heat-conducting oil storage capacity of the system, and the heat medium storage tank 50 maintains a low oil level during normal operation.

[0061] As described above, these are only specific embodiments of the present invention and cannot be used to limit the scope of the invention's implementation. Therefore, the replacement of equivalent components, or equivalent changes and modifications made in accordance with the scope of protection of this invention patent, should still fall within the scope covered by this patent. Additionally, the technical features within the present invention, between technical features, between technical features and technical solutions, and between technical solutions can all be freely combined and used.

Claims

1. An electric heating heat transfer oil thermal energy storage system, characterized in that, The electric heating heat-conducting oil heat storage system includes an electric heating heat-conducting oil furnace (10), a heat-conducting oil heat storage device (20), an oil-gas separator (30), and an expansion tank (40) that are connected in sequence. The electric heating heat-conducting oil furnace (10) can heat the heat-conducting oil. The heat-conducting oil in the electric heating heat-conducting oil furnace (10) can enter the heat-conducting oil heat storage device (20). The heat-conducting oil in the heat-conducting oil heat storage device (20) can enter the oil-gas separator (30). The heat-conducting oil in the oil-gas separator (30) can enter the electric heating heat-conducting oil furnace (10). The gas in the oil-gas separator (30) can enter the expansion tank (40). The heat-conducting oil in the expansion tank (40) can enter the heat-conducting oil heat storage device (20). The expansion tank (40) is located above the heat-conducting oil heat storage device (20). The heat-conducting oil heat storage device (20) is connected with a hot oil supply user pipeline (61) and a user cold oil return pipeline (62); The heat-conducting oil heat storage device (20) is provided with a first oil inlet (21), a second oil inlet (22), a first oil drain port (23), a second oil drain port (24), a hot oil supply port (25), and a cold oil return port (26). The hot oil supply user pipeline (61) is connected with the hot oil supply port (25), and the user cold oil return pipeline (62) is connected with the cold oil return port (26); The expansion tank (40) is provided with a liquid inlet (41), a gas inlet (42), and a liquid outlet (43). The liquid inlet (41) and the gas inlet (42) are both located in the upper part of the expansion tank (40), and the liquid outlet (43) is located in the lower part of the expansion tank (40); The liquid outlet (43) of the expansion tank (40) is connected with the second oil inlet (22) of the heat-conducting oil heat storage device (20) through a second oil pipeline (72). The second oil pipeline (72) is in an inclined state. The gas outlet of the oil-gas separator (30) is connected with the gas inlet (42) of the expansion tank (40) through an exhaust pipeline (77); The oil temperature in the expansion tank (40) does not exceed 60 °C; The electric heating heat-conducting oil heat storage system further includes a heat medium storage tank (50) and an oil injection main pipeline (80). The heat medium storage tank (50) is provided with a first oil inlet (51), a second oil inlet (52), a first oil outlet (53), and a second oil outlet (54). The heat-conducting oil in the heat-conducting oil heat storage device (20) can enter the heat medium storage tank (50). The heat-conducting oil in the heat medium storage tank (50) can enter the expansion tank (40). The heat-conducting oil in the oil injection main pipeline (80) can enter the heat medium storage tank (50), and the heat-conducting oil in the oil injection main pipeline (80) can also enter the expansion tank (40); The main oil injection pipeline (80) is successively provided with a first valve (81), an oil injection pump (82) and a second valve (83). The main oil injection pipeline (80) is connected to the liquid inlet (41) of the expansion tank (40) through a first oil injection branch line (84). The connection part of the first oil injection branch line (84) and the main oil injection pipeline (80) is located between the oil injection pump (82) and the second valve (83). The first oil injection branch line (84) is connected to the first oil inlet (51) of the heat medium storage tank (50) through a second oil injection branch line (85). A third valve (88) is provided on the second oil injection branch line (85); The position of the heat medium storage tank (50) is lower than that of the heat-conducting oil heat storage device (20). The second oil inlet (52) of the heat medium storage tank (50) is connected to the second oil drain port (24) of the heat-conducting oil heat storage device (20) through a fifth oil pipeline (75). A fourth valve (89) is provided on the fifth oil pipeline (75). A first oil drain branch line (86) is externally connected to the first oil outlet (53) of the heat medium storage tank (50). The second oil outlet (54) of the heat medium storage tank (50) is connected to the main oil injection pipeline (80) through a second oil drain branch line (87). The connection part of the second oil drain branch line (87) and the main oil injection pipeline (80) is located between the first valve (81) and the oil injection pump (82).

2. The electric heating heat-conducting oil heat storage system according to claim 1, wherein The first oil inlet (21), the second oil inlet (22) and the first oil drain port (23) are all located in the upper part of the heat-conducting oil heat storage device (20). The second oil drain port (24), the hot oil supply port (25) and the cold oil return port (26) are all located in the lower part of the heat-conducting oil heat storage device (20). A supply oil pump (63) is provided on the hot oil supply user pipeline (61).

3. The electric heating heat-conducting oil heat storage system according to claim 1, wherein, The electric heating heat-conducting oil furnace (10) contains an electric heater (11). The electric heater (11) can heat the heat-conducting oil in the electric heating heat-conducting oil furnace (10). The outlet of the electric heating heat-conducting oil furnace (10) is connected to the first oil inlet (21) of the heat-conducting oil heat storage device (20) through a first oil pipeline (71).

4. The electro-heated heat-conducting oil heat storage system according to claim 1, wherein The first oil drain port (23) of the heat-conducting oil heat storage device (20) is connected to the inlet of the oil-gas separator (30) through a third oil pipeline (73). The liquid outlet of the oil-gas separator (30) is connected to the inlet of the electric heating heat-conducting oil furnace (10) through a fourth oil pipeline (74). A circulation pump (76) is provided on the fourth oil pipeline (74).

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