Electric heating element for molten chloride

Abstract

The invention provides an electric heating element for molten chloride. The electric heating element comprises an upper conductive disc, a lower conductive disc, a conductive column, an insulating ring, an electric heating assembly and a thermocouple, the conductive column is inserted into the upper conductive disc and the lower conductive disc, the insulating ring is arranged between the lower conductive disc and the conductive column, the conductive column is sleeved with the electric heating assembly, the electric heating assembly is arranged between the upper conductive disc and the lower conductive disc, and the insulating ring is arranged between the upper conductive disc and the lower conductive disc. The plurality of thermocouples penetrate through the insulating ring and are connected with the electric heating assembly; the device has the beneficial effects that the thermocouple is connected with the electric heating assembly, so that the thermocouple can monitor the temperature of the electric heating assembly in real time, the safety and stability of the production process are ensured on the basis of heating and melting chlorate, the heating surface is expanded by arranging the first electric heating wire and the second electric heating wire with different screw diameters, and the production efficiency is improved. And the heating efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power equipment, and in particular relates to an electric heating element for molten chloride. Background Art

[0002] As an alternative working fluid for molten salt reactors, chloride salt has the advantages of low cost, large heat storage capacity, and high operating temperature, and has broad application prospects in the fields of reactors and energy storage. However, since the heat transfer characteristics of molten chloride salt are poorer than those of water, and the medium is easily separated from the original component during the melting process, the problem of excessive temperature of the heating element occurs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In order to solve the above problems, the present application provides an electric heating element for molten chloride, comprising: an upper conductive disk, a lower conductive disk, a conductive column, an insulating ring, an electric heating assembly and a thermocouple;

[0005] The conductive column is inserted into the upper conductive disk and the lower conductive disk, the insulating ring is arranged between the lower conductive disk and the conductive column, the electric heating component is sleeved on the outside of the conductive column, the electric heating component is arranged between the upper conductive disk and the lower conductive disk, and a plurality of the thermocouples are connected to the electric heating component through the insulating ring.

[0006] Optionally, the electric heating component includes: a first electric heating wire and a second electric heating wire;

[0007] The first heating wire and the second heating wire are alternately spirally arranged between the upper conductive disk and the lower conductive disk, and the thermocouple is connected to the first heating wire and the second heating wire.

[0008] Optionally, the first heating wire and the second heating wire have different spiral diameters, and the spiral diameter of the first heating wire is greater than the spiral diameter of the second heating wire.

[0009] Optionally, the spiral diameters at both ends of the first heating wire and the second heating wire are smaller than the spiral diameters in the middle.

[0010] Optionally, the upper conductive plate and the lower conductive plate are both provided with grooves, and both ends of the first heating wire and the second heating wire are arranged in the grooves.

[0011] Optionally, the first heating wire and the second heating wire are connected to the groove by welding.

[0012] Optionally, the insulating ring includes a connecting section and a fixed section, the fixed section is arranged at the bottom of the connecting section, the diameter of the fixed section is larger than the diameter of the connecting section, a fixing groove matching the fixed section is opened at the bottom of the lower conductive disk, and the connecting section and the lower conductive disk are detachably connected.

[0013] Optionally, the connecting section and the lower conductive disk are threadedly connected.

[0014] Optionally, the number of the thermocouples is 4-6 groups, a plurality of assembly holes are provided at intervals on the insulating ring, and the thermocouples are arranged in the assembly holes.

[0015] Optionally, the insulating ring is made of composite ceramic material.

[0016] Beneficial Effects

[0017] An electric heating element for melting chloride provided in an embodiment of the present invention has the following beneficial effects: by connecting a thermocouple with an electric heating component, the thermocouple can monitor the temperature of the electric heating component in real time, thereby heating and melting the chloride salt, thereby ensuring the safety and stability of the production process; by arranging the first electric heating wire and the second electric heating wire with different spiral diameters, the heating surface is expanded and the heating efficiency is improved; by applying a pulsating current, the first electric heating wire and the second electric heating wire exhibit periodic motion, thereby enhancing the heating effect of the electric heating component on the chloride salt, reducing the temperature of the electric heating component, and effectively extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the electric heating element for molten chloride of the present invention;

[0019] Figure 2 The electric heating element for molten chloride of the present invention Figure 1 Sectional structural diagram at AA in the middle;

[0020] Figure 3 It is a structural diagram of the connection between the conductive column and the lower conductive disk of the electric heating element for molten chloride of the present invention;

[0021] Figure 4 The structure diagram of the lower conductive disk of the electric heating element for molten chloride of the present invention;

[0022] Figure 5 This is a structural diagram of the connection between the upper conductive disk and the conductive column of the electric heating element for molten chloride of the present invention;

[0023] Figure 6 This is a structural diagram of the first electric heating wire of the electric heating element for molten chloride before power is turned on;

[0024] Figure 7 This is a structural diagram of the first electric heating wire of the electric heating element for molten chloride after power is turned on.

[0025] The reference numerals are as follows:

[0026] 1. Upper conductive disk; 2. Lower conductive disk; 3. Conductive column; 4. Insulating ring; 41. Connecting section; 42. Fixed section; 5. Electric heating assembly; 51. First heating wire; 52. Second heating wire; 6. Thermocouple. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] See also Figure 1-7 As shown, according to an embodiment of the present application, an electric heating element for molten chloride is provided, comprising: an upper conductive disk 1, a lower conductive disk 2, a conductive column 3, an insulating ring 4, an electric heating assembly 5 and a thermocouple 6;

[0032] The conductive column 3 is inserted into the upper conductive disk 1 and the lower conductive disk 2, the insulating ring 4 is arranged between the lower conductive disk 2 and the conductive column 3, the electric heating component 5 is sleeved on the outside of the conductive column 3, the electric heating component 5 is arranged between the upper conductive disk 1 and the lower conductive disk 2, and a plurality of the thermocouples 6 pass through the insulating ring 4 and are connected to the electric heating component 5.

[0033] Specifically, the upper conductive disk 1 is welded with the conductive column 3, and an insulating ring 4 is installed between the lower conductive disk 2 and the conductive column 3. The upper conductive disk 1 or the conductive column 3 is used to connect to the positive or negative pole of the power supply, and the lower conductive disk 2 is used to connect to the negative or positive pole of the power supply, so that the electric heating component 5 installed between the upper conductive disk 1 and the lower conductive disk 2 forms a current path. When the current passes through, the electric heating component 5 can generate heat to melt the chloride salt in the reactor; the thermocouple 6 passes through the insulating ring 4 and is connected to the electric heating component 5, and the thermocouple 6 can accurately measure the temperature of the electric heating component 5. Since the electric heating component 5 needs to heat the chloride to a specific temperature to achieve melting during operation, the medium is easily separated from the electric heating component 5 during the melting process, resulting in the electric heating component 5 being too high in temperature and easy to be damaged. By continuously monitoring the temperature through the thermocouple 6, the abnormal increase or decrease in the temperature of the electric heating component 5 can be discovered in time. If the temperature is too high, the electric heating component 5 may be damaged or cause a safety accident; and if the temperature is too low, the chloride may not be fully melted, affecting the production process. Therefore, the thermocouple 6 can issue an alarm in time when the temperature is abnormal, reminding the operator to take corresponding measures to ensure the safety and stability of the production process.

[0034] The conductive pillar 3 and the upper conductive plate 1 are welded into an integrated structure, thereby improving the stability of the connection between the conductive pillar 3 and the upper conductive plate 1 .

[0035] Among them, since the conductive column 3 and the upper conductive disk 1 are welded into an integral structure, the conductive column 3 or the upper conductive disk 1 and the lower conductive disk 2 are respectively connected to the two poles of the power supply, so that the electric heating component 5 installed between the upper conductive disk 1 and the lower conductive disk 2 forms a current path.

[0036] The insulating ring 4 is installed between the lower conductive plate 2 and the conductive column 3, so that the lower conductive plate 2 is isolated from the conductive column 3 to prevent direct contact between the two. During the operation of the electric heating component 5, if there is no isolation of the insulating ring 4, a short circuit may occur between the lower conductive plate 2 and the conductive column 3, thereby damaging the electric heating component 5.

[0037] The electric heating component 5 includes: a first electric heating wire 51 and a second electric heating wire 52;

[0038] The first heating wire 51 and the second heating wire 52 are alternately and spirally arranged between the upper conductive disk 1 and the lower conductive disk 2 , and the thermocouple 6 is connected to the first heating wire 51 and the second heating wire 52 .

[0039] Specifically, the electric heating component 5 includes a first heating wire 51 and a second heating wire 52, both of which are spiral structures and are alternately sleeved on the outside of the conductive column 3. A half-rectified or fully rectified DC power supply is used between the upper conductive disk 1 and the lower conductive disk 2, wherein the DC power supply is 10-15 pulses, the current is 40-50A, and the voltage should not be greater than 220V. Under the action of the current, the first heating wire 51 and the second heating wire 52 are contracted toward the middle under the interaction of magnetic forces; when the current drops, the heating wire returns to its original state; after applying the pulsating DC current, the period of the pulsating current should be 0.1-0.4s, and the first heating wire 51 and the second heating wire 52 show periodic motion, thereby realizing local heat transfer enhancement. When the chloride salt is heated, the periodic movement of the first heating wire 51 and the second heating wire 52 can disturb the air between the electric heating component 5 and the chloride salt separation part and the chloride salt melt at the bottom, thereby improving the heat transfer efficiency. Under the action of different electric fields, the spiral first heating wire 51 and the second heating wire 52 periodically expand and contract under the action of the magnetic field, thereby strengthening the heat exchange effect of the fluid around the electric heating component 5, and reducing the surface temperature of the first heating wire 51 and the second heating wire 52 under the same heat flux density, thereby reducing the damage rate of the electric heating element.

[0040] Wherein, each of the first heating wire 51 and the second heating wire 52 is provided with a thermocouple 6, and the thermocouple 6 is spot-welded to the first heating wire 51 and the second heating wire 52 to monitor the temperature of the first heating wire 51 and the second heating wire 52 to prevent overheating damage.

[0041] An arc-shaped buffer zone is provided at the connection between the thermocouple 6 and the first heating wire 51 or the second heating wire 52 to ensure that the first heating wire 51 and the second heating wire 52 will not separate when they are in periodic motion.

[0042] The first heating wire 51 and the second heating wire 52 have different spiral diameters, and the spiral diameter of the first heating wire 51 is larger than the spiral diameter of the second heating wire 52 .

[0043] Specifically, the first heating wire 51 and the second heating wire 52 are arranged alternately in a spiral, but the spiral diameters of the first heating wire 51 and the second heating wire 52 are different. The spiral diameter of the first heating wire 51 is larger than the spiral diameter of the second heating wire 52, so that the first heating wire 51 is located outside the second heating wire 52, realizing the arrangement of multiple groups of heating wires in the space, improving the heating efficiency of the chloride salt, and improving the compactness of the electric heating component 5.

[0044] The number of the first heating wire 51 can be one or more, and the number of the second heating wire 52 can be one or more.

[0045] The spiral diameters at both ends of the first heating wire 51 and the second heating wire 52 are smaller than the spiral diameters at the middle portions.

[0046] Specifically, by setting the spiral diameters at both ends of the first heating wire 51 and the second heating wire 52 smaller than the spiral diameters in the middle, the vibration of the first heating wire 51 and the second heating wire 52 under the action of alternating current can be achieved, so as to enhance the heat dissipation of the first heating wire 51 and the second heating wire 52 and eliminate the problem of deformation and damage of the first heating wire 51 and the second heating wire 52 caused by material phase change.

[0047] The upper conductive plate 1 and the lower conductive plate 2 are both provided with grooves, and both ends of the first heating wire 51 and the second heating wire 52 are disposed in the grooves.

[0048] The first heating wire 51 and the second heating wire 52 are connected to the groove by welding.

[0049] Specifically, grooves are provided on the lower side and the upper side of the upper conductive plate 1, and the grooves are used to fix and conduct electricity to the two ends of the first heating wire 51 and the second heating wire 52; further, the first heating wire 51 and the second heating wire 52 are connected to the grooves by brazing, and brazing can adapt to various welded parts with complex shapes, whether small precision parts or large structural parts, to achieve effective connection. For parts with irregular shapes, narrow gaps or difficult to reach, brazing can be completed by selecting appropriate brazing materials and heating methods, and has good corrosion resistance.

[0050] The insulating ring 4 includes a connecting section 41 and a fixing section 42. The fixing section 42 is arranged at the bottom of the connecting section 41. The diameter of the fixing section 42 is larger than the diameter of the connecting section 41. A fixing groove matching the fixing section 42 is opened at the bottom of the lower conductive plate 2. The connecting section 41 and the lower conductive plate 2 are detachably connected.

[0051] Specifically, the insulating ring 4 includes a connecting section 41 and a fixing section 42. The diameter of the fixing section 42 is larger than the diameter of the connecting section 41, so that when the insulating ring 4 is installed on the lower conductive plate 2, the fixing section 42 is located in the fixing groove to achieve installation positioning. The connecting section 41 can be detachably connected to the lower conductive plate 2, which is convenient for installing the insulating ring 4.

[0052] A sealing gasket is installed between the fixing section 42 and the fixing groove to improve the sealing performance after installation.

[0053] The connection section 41 and the lower conductive plate 2 are connected by threads.

[0054] Specifically, the connection section 41 and the lower conductive plate 2 may be welded, preferably threaded, for easier disassembly.

[0055] The number of the thermocouples 6 is 4-6 groups, and a plurality of assembly holes are provided at intervals on the insulating ring 4, and the thermocouples 6 are arranged in the assembly holes.

[0056] Specifically, a plurality of assembly holes are spaced apart around the insulating ring 4, and the thermocouple 6 is installed through the assembly holes. After installation, the thermocouple 6 is fixed and sealed to the bottom of the insulating ring 4 by spot welding. Each of the first heating wire 51 and the second heating wire 52 is welded to the thermocouple 6 by spot welding to monitor the temperature of the first heating wire 51 and the second heating wire 52 to prevent overheating damage.

[0057] The insulating ring 4 is made of composite ceramic material.

[0058] Specifically, the insulating ring 4 is made of a composite ceramic material, which usually has a very high resistivity and can effectively prevent the passage of electric current, thereby ensuring the safety of the electric heating component 5 during operation. Even under harsh conditions such as high temperature and high voltage, it can maintain stable insulation performance to prevent accidents such as leakage and short circuit. It can resist corrosion from various chemical substances. In an environment of molten chloride, there may be some corrosive substances, such as chlorine, hydrogen chloride, etc., and the insulating layer of the composite ceramic material can effectively resist the attack of these corrosive substances and keep its insulation performance unaffected.

[0059] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An electric heating element for molten chloride, characterized in that include: An upper conductive disk (1), a lower conductive disk (2), a conductive column (3), an insulating ring (4), an electric heating component (5) and a thermocouple (6); The conductive column (3) is inserted into the upper conductive disk (1) and the lower conductive disk (2); the insulating ring (4) is arranged between the lower conductive disk (2) and the conductive column (3); the electric heating component (5) is sleeved on the outside of the conductive column (3); the electric heating component (5) is arranged between the upper conductive disk (1) and the lower conductive disk (2); and a plurality of thermocouples (6) pass through the insulating ring (4) and are connected to the electric heating component (5).

2. The electric heating element for molten chloride according to claim 1, characterized in that The electric heating component (5) comprises: a first electric heating wire (51) and a second electric heating wire (52); The first heating wire (51) and the second heating wire (52) are alternately spirally arranged between the upper conductive disk (1) and the lower conductive disk (2), and the thermocouple (6) is connected to the first heating wire (51) and the second heating wire (52).

3. The electric heating element for molten chloride according to claim 2, characterized in that The spiral diameters of the first heating wire (51) and the second heating wire (52) are different, and the spiral diameter of the first heating wire (51) is larger than the spiral diameter of the second heating wire (52).

4. The electric heating element for molten chloride according to claim 3, characterized in that The spiral diameters at both ends of the first heating wire (51) and the second heating wire (52) are smaller than the spiral diameters in the middle.

5. The electric heating element for molten chloride according to claim 4, characterized in that The upper conductive plate (1) and the lower conductive plate (2) are both provided with grooves, and both ends of the first heating wire (51) and the second heating wire (52) are arranged in the grooves.

6. The electric heating element for molten chloride according to claim 5, characterized in that The first heating wire (51) and the second heating wire (52) are connected to the groove by welding.

7. The electric heating element for molten chloride according to claim 6, characterized in that The insulating ring (4) comprises a connecting section (41) and a fixing section (42); the fixing section (42) is arranged at the bottom of the connecting section (41); the diameter of the fixing section (42) is larger than the diameter of the connecting section (41); a fixing groove matching the fixing section (42) is provided at the bottom of the lower conductive plate (2); and the connecting section (41) and the lower conductive plate (2) are detachably connected.

8. The electric heating element for molten chloride according to claim 7, characterized in that The connecting section (41) and the lower conductive disk (2) are connected by threads.

9. The electric heating element for molten chloride according to claim 1, characterized in that The number of the thermocouples (6) is 4-6 groups, and a plurality of assembly holes are provided at intervals on the insulating ring (4), and the thermocouples (6) are arranged in the assembly holes.

10. The electric heating element for molten chloride according to claim 1, characterized in that The insulating ring (4) is made of composite ceramic material.

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