Device for heating fused salt by high-voltage electrode

Abstract

The utility model discloses a device for heating fused salt by a high-voltage electrode, which comprises a fused salt tank for containing fused salt, and a preheater, an ascending insulating pipeline, a circulating fused salt pump, an inlet electrode insulating pipeline, a fused salt electrode box and an outlet electrode insulating coil pipe are arranged in the fused salt tank. The rising insulating pipeline, the circulating fused salt pump, the inlet electrode insulating pipeline, the fused salt electrode box and the outlet electrode insulating coil pipe are sequentially connected, an inlet of the rising insulating pipeline and an outlet of the outlet electrode insulating coil pipe are communicated with the bottom of the fused salt tank, and a high-voltage electrode is placed on the fused salt electrode box and communicated with a high-voltage power supply device. And the preheater and the circulating molten salt pump are communicated with a low-voltage power supply device. According to the utility model, the technical problem of heating high-conductivity fused salt by using an electrode can be successfully solved, the electrode type heating device is not only suitable for fused salt electrode type heating, but also suitable for electrode type heating of other ionic conductors with flowability, and fused salt electric heating equipment with various powers and suitable for various voltage ranges can be designed and manufactured by using the electrode type heating device.

Description

Technical Field

[0001] The utility model relates to the technical field of heating molten salt, in particular to a device for heating molten salt with a high-voltage electrode. Background Art

[0002] In the field of heat storage, molten salt electric heating currently mostly uses electric heating rods to heat indirectly through heat conduction, which is a traditional heating method. Resistance wires and electric furnaces consume a lot of electricity and generate a lot of waste gas, wastewater and other pollutants. With the continuous development of material processing and production, traditional heating methods can no longer meet the requirements of higher efficiency, more energy saving and more environmental protection.

[0003] Electrode-heated molten salt only requires a small amount of electrical energy to achieve high-temperature heating. Since no other chemical reactions are involved in the production process, no pollution is generated. Electrode-heated molten salt can avoid heat radiation caused by the high surface temperature of the heating element, thereby reducing energy loss. Electrode-heated molten salt can be used for continuous, intermittent, and periodic heating at the same time, and can be applied to various fields.

[0004] There are problems with electrode heating of molten salt: the conductivity of molten salt is high, the heat generated is low, the heating reaction is relatively slow, and the uniformity of the molten salt needs to be controlled to avoid local over-temperature or large temperature gradients that cause damage to the molten salt structure. Therefore, it is necessary to optimize the heat transfer scheme during the heating process of the molten salt. Utility Model Content

[0005] In order to solve the above technical problems, the utility model designs a device for heating molten salt with high voltage electrodes, which can successfully solve the technical difficulties of using electrodes to heat high-conductivity molten salt. It is not only suitable for electrode heating of molten salt, but also suitable for electrode heating of other fluid ion conductors. The utility model can be used to design and manufacture molten salt electric heating equipment of various power sizes suitable for various voltage ranges.

[0006] The utility model adopts the following technical solutions:

[0007] A device for heating molten salt with a high-voltage electrode comprises a molten salt tank for containing molten salt, wherein a preheater, an ascending insulating pipe, a circulating molten salt pump, an inlet electrode insulating pipe, a molten salt electrode box and an outlet electrode insulating coil are arranged in the molten salt tank, the ascending insulating pipe, the circulating molten salt pump, the inlet electrode insulating pipe, the molten salt electrode box and the outlet electrode insulating coil are connected in sequence, the inlet of the ascending insulating pipe and the outlet of the outlet electrode insulating coil are connected to the bottom of the molten salt tank, a high-voltage electrode is placed on the molten salt electrode box, the high-voltage electrode is connected to a high-voltage power supply device, and the preheater and the circulating molten salt pump are connected to a low-voltage power supply device.

[0008] Preferably, three pre-heaters are arranged in the molten salt tank, and the three pre-heaters are evenly arranged along the circumference of the molten salt tank, and have the same size and relative position.

[0009] Preferably, the inlet electrode insulating pipe, molten salt electrode box, high-voltage electrode and outlet electrode insulating coil are three pieces respectively, which are evenly arranged along the circumference in the molten salt tank, with the same size and relative position. The rising insulating pipe and circulating molten salt pump are one piece, which are arranged in the center of the molten salt tank.

[0010] Preferably, the three inlet electrode insulating pipes have the same pipe resistance value, and the three outlet electrode insulating coils have the same pipe resistance value.

[0011] Preferably, a grounding wire is connected to the outer wall of the molten salt tank.

[0012] Preferably, the low-voltage power supply device is connected to 380V three-phase electricity.

[0013] Preferably, the high-voltage power supply device is connected to 6kV~10kV high-voltage three-phase electricity.

[0014] Preferably, the outer layer of the molten salt tank is insulated.

[0015] The utility model can utilize the power of abandoned solar and wind power, convert the electric energy into heat and store it for heating or peak load regulation. Through the utility model, the molten salt can reach above 500℃ after heating by utilizing abandoned wind and solar power or valley electricity, and can provide industrial high-temperature steam at different temperatures through the heat exchanger, or generate electricity again during the peak period of electricity consumption to meet the peak load regulation demand.

[0016] In order to solve the problem of high conductivity of molten salt, the design of the electrode insulating coil proposed by the utility model regards the molten salt in the insulating pipe as a cylindrical resistor, and its resistance value R = ρ * L / S, ρ is the conductivity of the molten salt, L is the length of the insulating pipe, and S is the inner cross-sectional area of ​​the insulating pipe. Reducing the inner cross-sectional area S of the insulating pipe or increasing the length L of the insulating pipe can increase the resistance value, but in order to meet the flow and safety requirements in the insulating pipe, there is a minimum limit on the pipe diameter, that is, the cross-sectional area S in the insulating pipe can only be small to a certain extent; but the design of the insulating coil can increase the length of the pipe, so the resistance of the molten salt in the insulating pipe will be able to be larger, and compared with the straight pipe, the coil can make the current passing through the inside smaller, which can avoid the damage of the molten salt structure caused by excessive local temperature or too large temperature gradient.

[0017] The beneficial effects of the utility model are as follows: the utility model can successfully solve the technical difficulties of using electrodes to heat high-conductivity molten salt, and is not only suitable for molten salt electrode heating, but also suitable for electrode heating of other fluid ion conductors. The utility model can be used to design and manufacture molten salt electric heating equipment of various power sizes suitable for various voltage ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] In the figure: 1. molten salt tank, 2. grounding device, 3. preheater, 4. rising insulated pipe, 5. circulating molten salt pump, 6. inlet electrode insulated pipe, 7. molten salt electrode box, 8. high-voltage electrode, 9. outlet electrode insulated coil, 10. low-voltage power supply device, 11. high-voltage power supply device. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0021] Example: As attached Figure 1 As shown, a device for heating molten salt with a high-voltage electrode comprises:

[0022] Molten salt tank 1, a total of 1 piece, a closed container for holding molten salt ( Figure 1 To show that the internal structure is not sealed), it has the characteristics of high temperature resistance and corrosion resistance, and the outside has thermal insulation;

[0023] A grounding device 2, 1 piece in total, connected to the molten salt tank 1 to ensure that the outer wall of the molten salt tank is in a grounded state;

[0024] The preheaters 3, 3 in total, are powered by a low voltage power supply device 10 and are installed in the molten salt tank 1. The 3 preheaters are spaced 120° apart from each other, and are the same in size and relative position, to ensure that the molten salt is heated more evenly. When started, the molten salt is heated to 200-250° C., and the molten salt in the molten salt tank 1 is in a molten state that can flow, and then the preheaters are turned off;

[0025] The rising insulating pipe 4, a total of 1 pipe, transports the molten low-temperature molten salt from the molten salt tank 1 to the inlet electrode insulating pipe 6, and then transports it to the corresponding molten salt electrode box 7. The rising insulating pipe 4, the inlet electrode insulating pipe 6, and the outlet electrode insulating coil 9 use insulating materials to isolate the charged molten salt to prevent current leakage and electrode corrosion, etc.;

[0026] A circulating molten salt pump 5, a total of 1 piece, powered by a low-voltage power supply device 10, installed on the rising insulated pipeline 4, provides power for transporting low-temperature molten salt, and can control the rotation speed to ensure the flow of molten salt transported into the molten salt electrode box 7. When the device is not in operation, the circulating molten salt pump 5 can be turned off, and the molten salt in the pipeline will flow back to the molten salt tank 1 under the action of gravity;

[0027] There are 3 in total in the electrode inlet insulating pipes 6, and the 3 connecting insulating pipes are 120° apart from each other, and the size and relative position are the same. The resistance value of each pipe is the same to ensure three-phase balance, and the rising insulating pipe 4 and the molten salt electrode box 7 are connected to ensure that the molten salt flow rate entering each molten salt electrode box 7 is consistent;

[0028] Molten salt electrode box 7, 3 pieces in total, used to place high voltage electrode 8, which has the characteristics of high temperature resistance and corrosion resistance, and receives molten salt from electrode inlet insulation pipe 6;

[0029] High-voltage electrodes 8, 3 pieces in total, each of which is 120° apart, with the same size and relative position to ensure three-phase balance, are connected to high-voltage electricity from a high-voltage power supply device 11, and form an electrical path in the electrode insulation coil 9, which can heat the molten salt in the coil to 300-540°C;

[0030] There are three outlet electrode insulation coils 9. The molten salt in the molten salt electrode box 7 is transported back to the molten salt tank along the coils under the action of gravity, while taking out the heat;

[0031] The low voltage power supply device 10 is connected to 380V three-phase electricity to supply power to the preheater 3, the circulating molten salt pump 5 and other electrical equipment;

[0032] The high-voltage power supply device 11 is connected to 6kV~10kV high-voltage three-phase electricity to supply power to the high-voltage electrode.

[0033] The utility model can utilize the power of abandoned solar and wind power, convert the electric energy into heat and store it for heating or peak load regulation. Through the utility model, the molten salt can reach above 500℃ after heating by utilizing abandoned wind and solar power or valley electricity, and can provide industrial high-temperature steam at different temperatures through the heat exchanger, or generate electricity again during the peak period of electricity consumption to meet the peak load regulation demand.

[0034] The utility model can successfully solve the technical problem of using electrodes to heat high-conductivity molten salt, and is not only suitable for molten salt electrode heating, but also suitable for electrode heating of other fluid ion conductors. The utility model can be used to design and manufacture molten salt electric heating equipment of various power sizes suitable for various voltage ranges.

[0035] In order to solve the problem of high conductivity of molten salt, the design of the electrode insulating coil proposed by the utility model regards the molten salt in the insulating pipe as a cylindrical resistor, and its resistance value R = ρ * L / S, ρ is the conductivity of the molten salt, L is the length of the insulating pipe, and S is the inner cross-sectional area of ​​the insulating pipe. Reducing the inner cross-sectional area S of the insulating pipe or increasing the length L of the insulating pipe can increase the resistance value, but in order to meet the flow and safety requirements in the insulating pipe, there is a minimum limit on the pipe diameter, that is, the cross-sectional area S in the insulating pipe can only be small to a certain extent; but the design of the insulating coil can increase the length of the pipe, so the resistance of the molten salt in the insulating pipe will be able to be larger, and compared with the straight pipe, the coil can make the current passing through the inside smaller, which can avoid the damage of the molten salt structure caused by excessive local temperature or too large temperature gradient.

[0036] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A device for heating molten salt with a high voltage electrode, characterized in that: The invention comprises a molten salt tank for containing molten salt, wherein a preheater, an ascending insulating pipe, a circulating molten salt pump, an inlet electrode insulating pipe, a molten salt electrode box and an outlet electrode insulating coil are arranged in the molten salt tank, the ascending insulating pipe, the circulating molten salt pump, the inlet electrode insulating pipe, the molten salt electrode box and the outlet electrode insulating coil are connected in sequence, the inlet of the ascending insulating pipe and the outlet of the outlet electrode insulating coil are connected to the bottom of the molten salt tank, a high-voltage electrode is placed on the molten salt electrode box, the high-voltage electrode is connected to a high-voltage power supply device, and the preheater and the circulating molten salt pump are connected to a low-voltage power supply device.

2. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: Three preheaters are arranged in the molten salt tank. The three preheaters are evenly arranged along the circumference of the molten salt tank and have the same size and relative position.

3. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: The inlet electrode insulating pipe, molten salt electrode box, high-voltage electrode and outlet electrode insulating coil are three pieces respectively, which are evenly arranged along the circumference in the molten salt tank, with the same size and relative position. The rising insulating pipe and circulating molten salt pump are one piece, which are arranged in the center of the molten salt tank.

4. The device for heating molten salt with a high-voltage electrode according to claim 3 is characterized in that: The pipe resistance values ​​of the three inlet electrode insulating pipes are the same, and the pipe resistance values ​​of the three outlet electrode insulating coils are the same.

5. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: A grounding wire is connected to the outer wall of the molten salt tank.

6. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: The low voltage power supply device is connected to 380V three-phase electricity.

7. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: The high voltage power supply device is connected to 6kV~10kV high voltage three-phase electricity.

8. The device for heating molten salt with a high-voltage electrode according to claim 1 is characterized in that: The outer layer of the molten salt tank is thermally insulated.

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