High performance energy storage molten salt electric heater

Abstract

The application discloses a high-performance energy storage molten salt electric heater, which comprises a shell, a molten salt inlet and a molten salt outlet are arranged on the shell, a split inner cylinder is arranged in the shell, an annular partition plate is arranged on the outer side of the split inner cylinder, the annular partition plate is sealingly connected between the shell and the split inner cylinder, the molten salt inlet and the molten salt outlet are respectively arranged on the two sides of the annular partition plate, the molten salt inlet is arranged on the circumferential side of the shell, the molten salt outlet is arranged on the axial end of the shell and faces one end of the split inner cylinder, a plurality of heating pipes are arranged in the shell, the heating pipes are arranged to extend from one end of the shell and are connected to a heater base, and a power connection box for supplying power to the heating pipes is arranged on the heater base. The application has the advantages of reducing the short circuit and leakage of fluid in the shell, improving the heat transfer efficiency and reducing the molten salt fouling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molten salt energy storage, and particularly relates to a high-performance energy storage molten salt electric heater. BACKGROUND

[0002] At present, a more ideal heating mode is double-tank molten salt low-valley electricity heat storage heating. Molten salt has excellent heat storage performance and is widely used in the fields of solar energy and nuclear energy. In laboratory research or industrial application, insoluble impurities are inevitably introduced in the process of molten salt preparation and use. These insoluble impurities may deposit due to changes in temperature and environment during the industrial use of molten salt, which brings unsafe factors to the use of molten salt.

[0003] There are mainly three flow forms of shell-side fluid: (1) transverse flow, such as the traditional segmental baffle plate that makes the shell-side fluid vertically wash the tube bundle to form transverse flow; (2) longitudinal flow, such as the baffle rod that makes the shell-side fluid parallel to the tube bundle to form longitudinal flow; and (3) spiral flow, such as the helical baffle plate that makes the shell-side fluid generally present spiral flow, but this spiral flow is still transverse flow of the fluid flowing across the tube bundle in nature. The heat transfer performance of different shell-side flow forms is quite different. It is found that the longitudinal flow type electric heater has the following advantages over the transverse flow type electric heater: the shell-side fluid longitudinally flows across the tube bundle, preventing the generation of induced vibration and improving the safety factor of the equipment; the resistance of the shell-side fluid is greatly reduced, the pump work is reduced, and energy is saved; the flow dead zone and leakage loss when flowing across the tube bundle are reduced; the deposition of dirt and the generation of corrosion are reduced, and the service life of the equipment is improved.

[0004] Research shows that, under the same shell-side flow condition, the existing single-shell baffle rod electric heater has the maximum feature that its flow resistance is lower than that of the traditional segmental baffle plate electric heater, but at the same time, the low shell-side flow velocity of the single-shell baffle rod electric heater causes insufficient heat transfer capacity. In order to improve the heat transfer effect, the shell-side fluid flow velocity can only be increased by reducing the shell-side diameter or increasing the shell-side length to enhance the heat transfer, but this method not only makes the electric heater structure large and the land occupation area expand, but also the increase of the heat transfer effect is not significant.

[0005] As shown in Figure 1 The current rectangular split-path baffle double-shell structure has the problem that the medium leaks from the longitudinal narrow area between the two long edges of the rectangular split-path baffle and the shell. As shown in Figure 2As shown, the recently adopted split inner cylinder and annular split partition type double shell structure is a split structure composed of a split inner cylinder and an annular split partition, which divides the shell into a first shell and a second shell. The annular split partition is located in the middle of the inlet and outlet connections of the shell, and the inner circumference of the annular split partition is welded with the front end of the inner cylinder. Although this split structure eliminates the short circuit occurring in the longitudinal narrow area between the two long sides of the rectangular split partition and the shell, it inevitably produces a certain amount of leakage between the inner wall of the shell and the outer circumference of the annular split partition, thereby reducing the heat transfer efficiency. At the same time, due to the fact that the front end of the inner cylinder and the right side connection of the shell are away from the tube plate, the flow path is shortened, and the effective heat transfer area is reduced. SUMMARY

[0006] The technical problems solved by the present application are: how to reduce the fluid short circuit leakage in the shell, how to improve the heat transfer efficiency, and how to reduce the molten salt fouling. In order to overcome the shortcomings of the prior art, the present application provides a high-performance energy storage molten salt electric heater.

[0007] The technical solution adopted by the present application to solve its technical problems is: a high-performance energy storage molten salt electric heater, characterized in that it comprises a shell, the shell has a molten salt inlet and a molten salt outlet, the shell is provided with a split inner cylinder, the outer side of the split inner cylinder is provided with an annular partition, the annular partition is sealingly connected between the shell and the split inner cylinder, the molten salt inlet and the molten salt outlet are located on the two sides of the annular partition, the molten salt inlet is arranged on the circumferential side of the shell, and the molten salt outlet is arranged on the axial end of the shell and faces one end of the split inner cylinder.

[0008] A plurality of heating pipes are arranged in the shell, the heating pipes extend from one end of the shell and are connected to a heater base, and the heater base is provided with an electric connection box for supplying power to the heating pipes.

[0009] Preferably, the shell is provided with an annular inlet chamber around the shell at the position of the molten salt inlet, and the molten salt entering from the molten salt inlet enters the shell through the inlet chamber.

[0010] Preferably, an inner lining cylinder is arranged in the shell at the position of the inlet chamber, one side of the inner lining cylinder is sealingly connected with the shell, and the other side of the inner lining cylinder has a gap with the shell.

[0011] Preferably, a plurality of first grid plate holes are arranged on the inner lining cylinder.

[0012] Preferably, the outer ring of the annular partition is sealingly connected with the inner lining cylinder, and the first grid plate holes on the inner lining cylinder are located on the side of the annular partition close to the molten salt inlet.

[0013] Preferably, the inlet bin is provided with a liquid discharge port at the bottom of the shell, and the inner liner cylinder is provided with a tear hole at the bottom, which is located on one side of the annular partition plate close to the molten salt outlet.

[0014] Preferably, a gap is formed between the end of the split inner cylinder away from the molten salt outlet and the shell, and a plurality of second grid holes are formed on the side of the end of the split inner cylinder away from the molten salt outlet.

[0015] Preferably, the split inner cylinder is provided with odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates inside, and the split inner cylinder and the shell are provided with odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates alternately, and a plurality of ribs are formed on the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates.

[0016] The ribs on the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates are vertically arranged, and a plurality of semicircular support grooves for positioning the heating pipes are formed on the left and right sides of the ribs.

[0017] The ribs on the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates are horizontally arranged, and a plurality of semicircular support grooves for positioning the heating pipes are formed on the upper side of the ribs.

[0018] The heating pipes pass through the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates, and are contained in the support grooves on the ribs.

[0019] Preferably, a pull rod is further arranged in the shell, the pull rod is parallel to the axis of the shell, one end of the pull rod is fixedly connected with the shell, the pull rod passes through the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates, and a plurality of distance tubes are sleeved on the pull rod, which are arranged between the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates or between the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates.

[0020] Preferably, a plurality of spiral twist pieces are arranged in the shell, which are arranged between the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates or between the odd-numbered longitudinal flow support plates and even-numbered longitudinal flow support plates.

[0021] In detail, the working process of the high-performance energy storage molten salt electric heater is as follows: the molten salt entering from the molten salt inlet is dispersed in the annular inlet chamber, then flows into the outer shell channel, exchanges heat with the heating pipe, then flows into the inner shell channel from the gap between the inner cylinder and the sealing plate of the split channel and the holes of the second grid plate, and finally the molten salt after heating is discharged from the molten salt outlet.

[0022] The beneficial effects of the present application are:

[0023] (1) In the present application, the annular partition plate is sealingly connected with the shell and the split channel inner cylinder, thereby avoiding the leakage of the medium between the molten salt inlet and the molten salt outlet, solving the short-circuit leakage of the shell channel medium in the longitudinal narrow area in the scheme shown in Figure 1 , and solving the short-circuit leakage of the shell channel medium in the circumferential area in the scheme shown in Figure 2 ;

[0024] (2) In the present application, the position of the molten salt inlet and the molten salt outlet is improved, and the molten salt outlet is arranged at the axial end of the shell, so that the medium flowing out of the shell is not easy to form circumferential turbulence, reducing the generation of heat transfer dead zones and indirectly improving the heat transfer efficiency;

[0025] (3) In the further scheme of the present application, the inlet chamber and the inner lining cylinder are arranged to disperse the medium entering from the molten salt inlet and then enter the shell, thereby reducing the circumferential flow of the medium in the shell and further reducing the generation of heat transfer dead zones and indirectly improving the heat transfer efficiency;

[0026] (4) In the further scheme of the present application, the first grid plate hole is arranged to reduce the impact of the medium on the inner lining cylinder, so that the inner lining cylinder is not easy to deform; the second grid plate hole is arranged to prevent the generation of heat transfer dead zones when the medium enters from the outside of the split channel inner cylinder to the inside of the split channel inner cylinder;

[0027] (5) In the further scheme of the present application, the drain port and the tear hole are arranged to drain the accumulated liquid in the inner shell channel;

[0028] (6) In the further scheme of the present application, the inner shell channel odd longitudinal flow support plate, the inner shell channel even longitudinal flow support plate, the outer shell channel odd longitudinal flow support plate and the outer shell channel even longitudinal flow support plate support the heating pipe, so that the heating pipe can be fixed without using additional fasteners such as screws, which facilitates the installation of the heating pipe;

[0029] (7) In the further scheme of the present application, the spiral twist piece is arranged to keep the molten salt in a longitudinal spiral mixed flow state between the pipe gaps, thereby enhancing the heat transfer effect and reducing the fouling of the molten salt. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of a baffle heat exchanger in the prior art;

[0031] Figure 2 is a schematic diagram of a split-range heat exchanger in the prior art;

[0032] Figure 3 is a schematic diagram of the overall structure of the present application;

[0033] Figure 4 is a schematic diagram of the flow direction of the medium in the shell of the present application;

[0034] Figure 5 is a schematic diagram of the even-numbered longitudinal flow support plate in the shell pass of the present application;

[0035] Figure 6 is a schematic diagram of the even-numbered longitudinal flow support plate in the inner shell pass of the present application;

[0036] Figure 7 is a schematic diagram of the odd-numbered longitudinal flow support plate in the shell pass of the present application;

[0037] Figure 8 is a schematic diagram of the odd-numbered longitudinal flow support plate in the inner shell pass of the present application;

[0038] Figure 9 is a schematic diagram of the installation of the heating pipe in the present application.

[0039] In the figure, 1 is the shell, 2 is the end plate, 3 is the end cover, 4 is the molten salt inlet, 5 is the molten salt outlet, 6 is the split-range inner cylinder, 7 is the annular partition plate, 8 is the inlet bin, 9 is the inner lining cylinder, 10 is the first grid hole, 11 is the liquid outlet, 12 is the weeping hole, 13 is the heating pipe, 14 is the odd-numbered longitudinal flow support plate in the inner shell pass, 15 is the even-numbered longitudinal flow support plate in the inner shell pass, 16 is the odd-numbered longitudinal flow support plate in the shell pass, 17 is the even-numbered longitudinal flow support plate in the shell pass, 18 is the rib, 19 is the support groove, 20 is the pull rod, 21 is the fixed-distance pipe, 22 is the spiral twisted sheet, 23 is the heater base, 24 is the saddle, and 25 is the second grid hole. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0041] Embodiment: Reference Figures 1-7 A high-performance energy storage molten salt electric heater includes a shell 1, which is internally used for heat exchange with molten salt. The shell 1 is horizontally cylindrical, one end is a detachable end plate 2, and the other end is a hemispherical end cover 3, both of which are sealingly connected with the main body of the shell 1. It should be understood that in the embodiments of the present application, the end plate 2 and the end cover 3 should be understood as part of the shell 1. The bottom of the shell 1 is provided with a saddle 24 for mounting the shell 1 on a solid foundation.

[0042] The shell 1 is provided with a molten salt inlet 4 and a molten salt outlet 5, which are used for the inlet and outlet of the molten salt medium, wherein the molten salt inlet 4 is arranged on the circumferential side of the shell 1 and located at the top of the shell 1, and the molten salt outlet 5 is arranged on the axial end of the shell 1, that is, the molten salt outlet 5 is arranged on the head 3.

[0043] The shell 1 is provided with a split inner cylinder 6, which is a cylindrical shape and arranged concentrically with the shell 1. The split inner cylinder 6 divides the space in the shell 1 into two parts, that is, an inner shell section located inside the split inner cylinder 6 and an outer shell section located outside the split inner cylinder 6. The outer side of the split inner cylinder 6 is provided with an annular partition plate 7, which is sealingly connected between the shell 1 and the split inner cylinder 6, and the molten salt inlet 4 and the molten salt outlet 5 are located on the two sides of the annular partition plate 7, and the molten salt outlet 5 is opposite to one end of the split inner cylinder 6. Through the division of the annular partition plate 7, the inner shell section and the outer shell section are unidirectionally communicated, as shown by the arrow, the medium entering the shell 1 first flows in the outer shell section, then flows into the inner shell section and finally flows out from the molten salt outlet 5. Figure 2

[0044] The shell 1 is provided with an annular inlet chamber 8 around the shell 1 at the position of the molten salt inlet 4, and the molten salt entering from the molten salt inlet 4 enters the shell 1 through the inlet chamber 8. The diameter of the inlet chamber 8 is larger than that of the shell 1 itself, and the molten salt inlet 4 is arranged on the inlet chamber 8, so that the medium entering from the molten salt inlet 4 is first dispersed in the inlet chamber 8, and then flows from the inlet chamber 8 into the outer shell section, so that the medium entering the outer shell section is not easy to form a heat transfer dead zone in the form of annular flow.

[0045] In order to improve the dispersion effect of the medium in the inlet chamber 8, an inner lining cylinder 9 is arranged in the shell 1 at the position of the inlet chamber 8, one side of the inner lining cylinder 9 is sealingly connected with the shell 1, and the other side of the inner lining cylinder 9 has a gap with the shell 1. Through the blocking effect of the inner lining cylinder 9, the medium entering from the molten salt inlet 4 can be quickly dispersed in the inlet chamber 8.

[0046] At the same time, in order to avoid the impact of the medium on the inner lining cylinder 9 and cause the deformation of the inner lining cylinder 9, a plurality of first grid holes 10 are arranged on the inner lining cylinder 9, the first grid holes 10 can pass through the medium, thereby reducing the impact of the medium on the inner lining cylinder 9.

[0047] In an embodiment of the present application, the outer ring of the annular partition plate 7 is sealingly connected with the inner lining cylinder 9, and the annular partition plate 7 is indirectly sealingly connected with the shell 1 through the inner lining cylinder 9. The first grid holes 10 on the inner lining cylinder 9 are located on the side of the annular partition plate 7 close to the molten salt inlet 4.

[0048] ​The inlet chamber 8 is provided with a liquid discharge port 11, which is located at the bottom of the shell 1. The inner lining cylinder 9 is provided with a weeping hole 12, which is located at the side of the annular partition plate 7 close to the molten salt outlet 5. The accumulated liquid in the inner shell can flow down through the weeping hole 12 to the bottom of the inlet chamber 8 and then be discharged from the liquid discharge port 11.

[0049] The gap between the end of the inner cylinder 6 away from the molten salt outlet 5 and the outer shell allows the medium to enter the inner shell from the outer shell. The side of the end of the inner cylinder 6 away from the molten salt outlet 5 is provided with a plurality of second baffle holes 25, which allow the medium to enter the inner cylinder 6 without forming a heat transfer dead zone.

[0050] The shell 1 is provided with a plurality of heating pipes 13, which are U-shaped and uniformly distributed in the outer shell and the inner shell. One end of the heating pipe 13 extends out of the cover plate 2 and is provided with a corresponding hole in the cover plate 2. The heater extends out of the shell 1 and is connected to a heater base 23, which is provided with a power connection box for supplying power to the heating pipe 13.

[0051] The inner shell is provided with odd-numbered longitudinal flow support plates 14 and even-numbered longitudinal flow support plates 15. The gap between the inner cylinder 6 and the shell 1 is provided with odd-numbered longitudinal flow support plates 16 and even-numbered longitudinal flow support plates 17.

[0052] The odd-numbered longitudinal flow support plates 14, the even-numbered longitudinal flow support plates 15, the odd-numbered longitudinal flow support plates 16, and the even-numbered longitudinal flow support plates 17 are all provided with a plurality of ribs 18.

[0053] The ribs 18 on the odd-numbered longitudinal flow support plates 14 and the odd-numbered longitudinal flow support plates 16 are vertically arranged, and the left and right sides of the ribs 18 are provided with a plurality of semicircular support grooves 19 for positioning the heating pipes 13.

[0054] The ribs 18 on the even-numbered longitudinal flow support plates 15 and the even-numbered longitudinal flow support plates 17 are horizontally arranged, and the upper side of the ribs 18 is provided with a plurality of semicircular support grooves 19 for positioning the heating pipes 13.

[0055] The heating pipes 13 pass through the odd-numbered longitudinal flow support plates 14, the even-numbered longitudinal flow support plates 15, the odd-numbered longitudinal flow support plates 16, or the even-numbered longitudinal flow support plates 17, and the heating pipes 13 are contained in the support grooves 19 on the ribs 18.

[0056] The heating tube 13 is supported by the inner shell course odd longitudinal flow support plate 14, the inner shell course even longitudinal flow support plate 15, the outer shell course odd longitudinal flow support plate 16 and the outer shell course even longitudinal flow support plate 17, and the heating tube 13 can be fixed without using additional fasteners such as screws, which facilitates the installation of the heating tube 13.

[0057] The shell 1 is further provided with a pull rod 20 parallel to the axis of the shell 1, one end of the pull rod 20 is fixedly connected with the shell 1, specifically, the pull rod 20 passes through the sealing plate 2 and is fixedly connected with the sealing plate 2. The pull rod 20 passes through the inner shell course odd longitudinal flow support plate 14, the inner shell course even longitudinal flow support plate 15, the outer shell course odd longitudinal flow support plate 16 or the outer shell course even longitudinal flow support plate 17, and a plurality of distance tubes 21 are sleeved on the pull rod 20, the distance tubes 21 are arranged between the inner shell course odd longitudinal flow support plate 14 and the inner shell course even longitudinal flow support plate 15 or between the outer shell course odd longitudinal flow support plate 16 and the outer shell course even longitudinal flow support plate 17. The distance tubes 21 are used for positioning the positions of the inner shell course odd longitudinal flow support plate 14, the inner shell course even longitudinal flow support plate 15, the outer shell course odd longitudinal flow support plate 16 or the outer shell course even longitudinal flow support plate 17, so as to ensure the distance therebetween.

[0058] The shell 1 is further provided with a plurality of spiral twist pieces 22 arranged between the inner shell course odd longitudinal flow support plate 14 and the inner shell course even longitudinal flow support plate 15 or between the outer shell course odd longitudinal flow support plate 16 and the outer shell course even longitudinal flow support plate 17. The spiral twist pieces 22 are arranged to keep the molten salt in a longitudinal spiral mixing flow state between the tube gaps, so as to enhance the heat transfer effect and reduce the fouling of the molten salt.

[0059] In detail, the working process of the high-performance energy storage molten salt electric heater is as follows: the molten salt entering from the molten salt inlet 4 is dispersed in the annular inlet chamber 8, then flows in the outer shell course, exchanges heat with the heating tube 13, then enters the inner shell course from the gap between the inner shell course and the sealing plate 2 and the second grid plate hole 25, and finally flows out from the molten salt outlet 5 after being heated. The outer shell course odd longitudinal flow support plate 16, the outer shell course even longitudinal flow support plate 17, the inner shell course odd longitudinal flow support plate 14, the inner shell course even longitudinal flow support plate 15 and the spiral twist piece 22 play a role in strengthening heat transfer and reducing fouling for the flowing molten salt.

[0060] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. A high-performance energy storage molten salt electric heater, characterized in that, The device includes a housing (1), which has a molten salt inlet (4) and a molten salt outlet (5). The housing (1) is provided with a segmented inner cylinder (6). An annular partition plate (7) is provided on the outer side of the segmented inner cylinder (6). The annular partition plate (7) is sealed to the housing (1) and the segmented inner cylinder (6). The molten salt inlet (4) and the molten salt outlet (5) are located on both sides of the annular partition plate (7). The molten salt inlet (4) is located on the circumferential side of the housing (1). The molten salt outlet (5) is located at the axial end of the housing (1) and is directly opposite one end of the segmented inner cylinder (6). The housing (1) is provided with a plurality of heating tubes (13). The heating tubes (13) extend from one end of the housing (1) and are connected to a heater base (23). The heater base (23) is provided with a junction box for supplying power to the heating tubes (13). The shell (1) has an annular inlet chamber (8) surrounding the molten salt inlet (4) at the position of the molten salt inlet (4). The diameter of the inlet chamber is larger than the diameter of the shell. Molten salt entering from the molten salt inlet (4) enters the shell (1) through the inlet chamber (8). The shell (1) has an inner liner (9) located at the inlet chamber (8). One side of the inner liner (9) is sealed to the shell (1), and there is a gap between the other side of the inner liner (9) and the shell (1). The inner liner (9) has a plurality of first grid holes (10). The outer ring of the annular partition plate (7) is sealed to the inner liner (9), and the first grid holes (10) on the inner liner (9) are located on the side of the annular partition plate (7) close to the molten salt inlet (4). The inlet chamber (8) is provided with a drain port (11), which is located at the bottom of the shell (1). The bottom of the inner liner (9) is provided with a tear hole (12), which is located on the side of the annular partition plate (7) near the molten salt outlet (5).

2. The high-performance energy storage molten salt electric heater according to claim 1, characterized in that, The segmented inner cylinder (6) has a gap between the end away from the molten salt outlet (5) and the shell (1), and the side of the segmented inner cylinder (6) away from the molten salt outlet (5) is provided with a plurality of second grid plate holes (25).

3. The high-performance energy storage molten salt electric heater according to claim 1, characterized in that, The inner cylinder (6) is provided with an alternating arrangement of an odd-numbered longitudinal flow support plate (14) and an even-numbered longitudinal flow support plate (15) for the inner shell side. The inner cylinder (6) and the shell (1) are provided with an alternating arrangement of an odd-numbered longitudinal flow support plate (16) and an even-numbered longitudinal flow support plate (17) for the outer shell side. Each of the odd-numbered longitudinal flow support plate (14), the even-numbered longitudinal flow support plate (15), the odd-numbered longitudinal flow support plate (16), and the even-numbered longitudinal flow support plate (17) for the inner shell side is provided with several ribs (18). The ribs (18) on the inner shell odd-number longitudinal flow support plate (14) and the outer shell odd-number longitudinal flow support plate (16) are arranged vertically, and multiple semi-circular support grooves (19) for positioning the heating tube (13) are provided on the left and right sides of the ribs (18). The ribs (18) on the inner shell even-numbered longitudinal flow support plate (15) and the outer shell even-numbered longitudinal flow support plate (17) are arranged horizontally, and the upper side of the ribs (18) is provided with a plurality of semi-circular support grooves (19) for positioning the heating tube (13); The heating tube (13) passes through the inner shell odd-numbered longitudinal flow support plate (14), the inner shell even-numbered longitudinal flow support plate (15), the outer shell odd-numbered longitudinal flow support plate (16) or the outer shell even-numbered longitudinal flow support plate (17), and the heating tube (13) is housed in the support groove (19) on the rib (18).

4. The high-performance energy storage molten salt electric heater according to claim 3, characterized in that, The housing (1) is also provided with a pull rod (20), which is parallel to the axis of the housing (1). One end of the pull rod (20) is fixedly connected to the housing (1). The pull rod (20) passes through the inner shell odd-numbered longitudinal flow support plate (14), the inner shell even-numbered longitudinal flow support plate (15), the outer shell odd-numbered longitudinal flow support plate (16), or the outer shell even-numbered longitudinal flow support plate (17). The pull rod (20) is fitted with a plurality of spacer tubes (21), which are arranged between the inner shell odd-numbered longitudinal flow support plate (14) and the inner shell even-numbered longitudinal flow support plate (15) or between the outer shell odd-numbered longitudinal flow support plate (16) and the outer shell even-numbered longitudinal flow support plate (17).

5. The high-performance energy storage molten salt electric heater according to claim 3, characterized in that, The housing (1) is provided with a plurality of spiral twisted blades (22), which are disposed between the inner shell odd-numbered longitudinal flow support plate (14) and the inner shell even-numbered longitudinal flow support plate (15) or between the outer shell odd-numbered longitudinal flow support plate (16) and the outer shell even-numbered longitudinal flow support plate (17).

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