Heat-conducting fluid heater

Abstract

The invention relates to a heat conduction fluid heater which comprises a heating unit, the heating unit comprises a tubular shell, a heat conduction pipe arranged in the shell in a penetrating mode in the length direction and a heating pipe arranged in the heat conduction pipe in a penetrating mode, and an annular cavity used for containing heat conduction fluid is defined between the inner surface of the shell and the outer surface of the heat conduction pipe in the circumferential direction. An annular gap is reserved between the heat conduction pipe and the heating pipe in the circumferential direction. Compared with the prior art, the heat conduction pipe is additionally arranged between the heating pipe and the shell, under the condition that it is guaranteed that heat generated by the heating pipe is smoothly conducted to the heat conduction fluid, the actual flow speed of the heat conduction fluid is increased by reducing the flowing space of the heat conduction fluid, and therefore the heat exchange capacity of the heat conduction fluid is improved.

Description

Technical Field

[0001] The invention relates to the field of heat transfer fluid electric heat storage, and in particular to a heat transfer fluid heater. Background Art

[0002] Molten salt is a common heat transfer fluid. It is a melt formed by melting salts. It is solid at room temperature and pressure, and liquid when the temperature rises. Electric thermal storage uses electric heaters to heat molten salt to increase its temperature and achieve high-temperature thermal storage of molten salt. The goal of this process is to increase the temperature of molten salt as much as possible while keeping it safe (without decomposition) to maximize the thermal storage capacity of a unit amount of molten salt.

[0003] At present, the electric heater used to heat molten salt (or heat transfer oil) is mainly a direct heating tubular electric heater (molten salt is in direct contact with the heating tube), for example, the Chinese invention patent with application number CN202411192709.6 (publication number CN118912694A), the Chinese invention patent with application number CN 202411093442.5 (publication number CN118829022A), etc. However, in actual use, the existing electric heaters are prone to cause the maximum temperature of the heated molten salt to be much lower than the maximum temperature of the molten salt test, resulting in a large difference between the heat storage capacity of the unit molten salt and the ideal value. For example, the Hitec molten salt (components: 50% potassium nitrate, 7% sodium nitrate and 43% sodium nitrite) used in the project has a test decomposition temperature of 512°C and a theoretical safe use temperature of 500°C. Due to the low performance of existing electric heaters, all engineering designs can only set the temperature upper limit to 380-390°C, and the process temperature rises from 180°C to 380°C, with a temperature rise of only 200°C. It can be seen that if the temperature upper limit can be raised to 500°C, the heat storage capacity of the molten salt can be increased by more than 50% on the original basis.

[0004] The main factors that prevent existing electric heaters from achieving good heating of molten salt are as follows:

[0005] The existing electric heater is a tank body (or tube body) in which multiple electric heating tubes are arranged side by side. The tank body includes a tank body and flanges at both ends. The electric heating tubes are inserted by opening holes in the flanges, and there is a limit to the opening density of the holes in the flanges. Even if the electric heating tubes are arranged at the limit (flange opening density limit), the gaps between the electric heating tubes are still relatively large, resulting in excessive gaps inside the tank body. Therefore, the average flow rate of the molten salt inside the heater is very low, generally in the range of 0.007 to 0.019 m / s, and the flow rate at the wall of the electric heating tube is 1 / 3 of the average flow rate. The low flow rate leads to poor heat exchange between the electric heating tube and the molten salt, and in the case of a large space, the flow field distribution of the molten salt is uneven, which can easily lead to stagnation of the molten salt flow in some areas, forming a heat exchange dead zone. In addition, the molten salt flows along the outer wall of the electric heating tube, and the temperature of the molten salt at the outer wall of the electric heating tube is very likely to be too high. Therefore, if the design temperature is set too high, the molten salt will not decompose due to its own diffusion in the medium and low temperature areas, while the temperature in the high temperature area is very likely to exceed the lava decomposition temperature and cause part of the molten salt to decompose at excessive temperatures. In summary, it is difficult to further improve the heat storage capacity of existing heaters. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a heat-conducting fluid heater with good heating effect in view of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a heat-conducting fluid heater with good heating effect and high heating efficiency in view of the prior art.

[0008] The third technical problem to be solved by the present invention is to provide a heat transfer fluid heater which has good heating effect and can heat the temperature of the heat transfer fluid to a temperature exceeding the design temperature of the existing heater in view of the existing technology.

[0009] The technical solution adopted by the present invention to solve at least one of the above-mentioned technical problems is: a heat-conducting fluid heater, characterized in that it includes a heating unit, which includes a tubular outer shell, a heat-conducting pipe inserted in the outer shell along the length direction, and a heating pipe inserted in the heat-conducting pipe, an annular cavity for accommodating the heat-conducting fluid is circumferentially formed between the inner surface of the outer shell and the outer surface of the heat-conducting pipe, and an annular gap is left between the heat-conducting pipe and the heating pipe along the circumferential direction.

[0010] Furthermore, the first heat-conducting fins are arranged at intervals in the annular cavity along its length direction, and the first heat-conducting fins are arranged at intervals along the circumference of the annular cavity. By arranging the first heat-conducting fins in the annular cavity, on the one hand, the disturbance to the flow of the heat-conducting fluid can be increased, thereby further increasing the actual flow rate of the heat-conducting fluid, and then further improving the heat exchange capacity of the heat-conducting fluid. On the other hand, it is conducive to achieving uniform distribution of the temperature field in the flow-conducting fluid, avoiding regional flow stagnation and the generation of heat exchange dead zones.

[0011] Furthermore, at least one of the inner surface of the shell and the outer surface of the heat-conducting pipe is provided with the first heat-conducting fin, so as to facilitate the arrangement of each first heat-conducting fin in the annular cavity. Preferably, the first heat-conducting fin is arranged on the outer surface of the heat-conducting pipe, so that when the first heat-conducting fin is arranged on the outer surface of the heat-conducting pipe, the external heat exchange area of ​​the heat-conducting pipe can be increased, thereby improving the heat exchange efficiency of the heat-conducting fluid.

[0012] Furthermore, second heat-conducting fins are protruded in the annular gap on the inner surface of the heat-conducting pipe at intervals along its length direction, and the second heat-conducting fins are arranged at intervals along the circumference of the heat-conducting pipe. By adding the second heat-conducting fins on the inner surface of the heat-conducting pipe, on the one hand, the internal heat exchange area of ​​the heat-conducting pipe can be increased, and on the other hand, the radiation heat exchange capacity between the heat-conducting pipe and the heating pipe can be enhanced, thereby improving the heat exchange efficiency of the heat-conducting fluid.

[0013] Furthermore, the first heat-conducting fin is integrally protruded on the outer surface of the heat-conducting pipe, so that the internal structure of the heating unit can be compact, and by respectively adding the first heat-conducting fin and the second heat-conducting fin on both sides of the heat-conducting pipe, the radiation heat exchange capacity between the heat-conducting pipe and the heating pipe and the convection heat exchange capacity between the heat-conducting pipe and the heat-conducting fluid can be fully enhanced.

[0014] Furthermore, the shell and the heat conducting pipe are both arranged with the heating pipe as the center, so as to better ensure the uniform distribution of the temperature field and better avoid the regional flow stagnation and the generation of heat exchange dead zone.

[0015] Furthermore, the heating unit is arranged in the horizontal direction, and the upper and lower sides of the shell of the heating unit are respectively provided with an upper fluid port and a lower fluid port for the circulation of the heat transfer fluid at intervals along the length direction. The above-mentioned heating units are at least two and arranged in parallel, and in two adjacent heating units, the lower fluid port of one heating unit is fluidly connected with the upper fluid port of the other heating unit. When the heating power of the heating tube and the circulation area of ​​the annular cavity are determined, the temperature rise of the heat transfer fluid of a single heating unit is determined, so that the heat transfer fluid can be heated to the expected temperature rise by setting a certain number of heating units.

[0016] Furthermore, at least two of the above-mentioned heating units are stacked up and down to form an installation unit, and the lower fluid port of each heating unit in the installation unit is fluidly connected with the upper fluid port of another heating unit adjacent to the heating unit below.

[0017] There are at least three installation units, including a first installation unit, a second installation unit and a third installation unit arranged side by side in sequence, wherein the upper fluid ports of the uppermost heating unit of the first installation unit are respectively used for the inflow of heat transfer fluid, and the lower fluid ports of the lowermost heating unit of the first installation unit are respectively used for the outflow of heat transfer fluid, and are respectively fluidly connected with the lower fluid ports of the lowermost heating unit of the second installation unit, and the upper fluid ports of the uppermost heating unit of the second installation unit are respectively fluidly connected with the upper fluid ports of the uppermost heating unit of the third installation unit, and the lower fluid ports of the lowermost heating unit of the third installation unit are used for the outflow of heat transfer fluid. Each installation unit is composed of a plurality of heating units connected in series up and down, and the upper and lower fluid ports are used to realize the up and down flow of heat transfer fluid between adjacent heating units, thereby ensuring the uniform distribution and sufficient flow of heat transfer fluid, eliminating the generation of regional flow stagnation and heat exchange dead zone, and ensuring the uniformity of temperature field distribution.

[0018] Furthermore, it also includes a storage tank for storing heat transfer fluid and located above each of the above-mentioned installation units, a fluid inlet for the heat transfer fluid to flow in, and a fluid outlet for the heat transfer fluid to flow out, wherein the outlet end of the above-mentioned storage tank is in fluid communication with the above-mentioned fluid inlet, and each upper fluid inlet of the heating unit at the uppermost end of one of the installation units located at the side constitutes the above-mentioned fluid inlet, and each lower fluid inlet of the heating unit at the lowermost end of another installation unit located at the side constitutes the above-mentioned fluid outlet or is in fluid communication with the above-mentioned fluid outlet, and the fluid outlet is located at the lowest point. In this way, the heat transfer fluid can flow smoothly into each installation unit, wherein the fluid outlet is set at the lowest point, so that after the heating is completed, all the heat transfer fluid can be fully discharged by using the low-level siphon function.

[0019] Furthermore, the installation units are arranged opposite to each other in sequence, and the lower fluid ports of the heating units at the lower end of the installation units at the side are connected to vertically extending flow guide pipes, the lower pipe ports of which constitute the above-mentioned fluid outlets, so as to better ensure the output of the heated heat transfer fluid.

[0020] Compared with the prior art, the advantages of the present invention are that the heating unit includes a shell, a heat-conducting pipe and a heating pipe, wherein the heat-conducting pipe is arranged outside the heating pipe and the shell is arranged outside the heat-conducting pipe, and an annular cavity for accommodating a heat-conducting fluid is formed circumferentially between the inner surface of the shell and the outer surface of the heat-conducting pipe, and an annular gap is left circumferentially between the heat-conducting pipe and the heating pipe. Compared with the prior art, the present invention increases the actual flow rate of the heat-conducting fluid by reducing the flow space of the heat-conducting fluid while adding a heat-conducting pipe between the heating pipe and the shell, thereby improving the heat exchange capacity of the heat-conducting fluid, so that the heating temperature of the heat-conducting fluid exceeds the design temperature of the existing heater, and even reaches the ideal temperature (for example, the ideal temperature of the molten salt is 500°C). In addition, by forming an annular gap between the heating pipe and the heat-conducting pipe, the heat generated by the heating pipe can be more evenly transferred to the heat-conducting pipe, which is conducive to improving the uniformity of the temperature field in the annular cavity, and further improving the heating effect of the heat-conducting fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a front view of a thermal fluid heater according to an embodiment of the present invention;

[0022] Figure 2 is a side view of a thermally conductive fluid heater according to an embodiment of the present invention;

[0023] Figure 3 for Figure 1 A magnified view of part A;

[0024] Figure 4 It is a structural schematic diagram of a heating unit in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure in another direction;

[0026] Figure 6 It is a structural exploded view of a heating unit in an embodiment of the present invention;

[0027] Figure 7 for Figure 6 Enlarged view of part B. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, 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", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] like Figures 1 to 7 As shown, a heat transfer fluid heater comprises a heating unit 1, wherein the heating unit 1 comprises a tubular outer shell 11, a heat transfer pipe 13 passing through the outer shell 11 along the length direction, and a heating pipe 12 passing through the heat transfer pipe 13. An annular cavity 10 (such as a heat transfer fluid) is formed between the inner surface of the outer shell 11 and the outer surface of the heat transfer pipe 13 along the circumferential direction for accommodating the heat transfer fluid. Figure 3 As shown), an annular gap is left between the heat conducting pipe 13 and the heating pipe 12 along the circumferential direction.

[0031] As can be seen from the above, the heating unit 1 in the present invention includes a shell 11, a heat-conducting pipe 13 and a heating pipe 12, wherein the heat-conducting pipe 13 is arranged outside the heating pipe 12 and the shell 11 is arranged outside the heat-conducting pipe 13, and an annular cavity 10 for accommodating a heat-conducting fluid is circumferentially formed between the inner surface of the shell 11 and the outer surface of the heat-conducting pipe 13, and an annular gap is left circumferentially between the heat-conducting pipe 13 and the heating pipe 12. Compared with the prior art, the present invention increases the actual flow rate of the heat-conducting fluid by reducing the flow space of the heat-conducting fluid while ensuring that the radiant heat generated by the heating pipe 12 is smoothly transferred to the heat-conducting fluid by adding a heat-conducting pipe 13 between the heating pipe 12 and the shell 11, thereby improving the heat exchange capacity of the heat-conducting fluid, so that the heating temperature of the heat-conducting fluid exceeds the design temperature of the existing heater, and even reaches the ideal temperature (for example, the ideal temperature of molten salt is 500°C). In addition, by forming an annular gap between the heating tube 12 and the heat conducting tube 13, the heat generated by the heating tube 12 can be more evenly transferred to the heat conducting tube 13, which is beneficial to improve the uniformity of the temperature field in the annular cavity 10, and further enhance the heating effect of the heat conducting fluid.

[0032] In the present invention, the heat transfer fluid may be at least one of molten salt or heat transfer oil. In this embodiment, the heat transfer fluid is specifically liquid molten salt.

[0033] Further, the first heat-conducting fins 131 are arranged at intervals in the annular cavity 10 along its length direction, and the first heat-conducting fins 131 are arranged at intervals along the circumferential direction of the annular cavity 10. By arranging the first heat-conducting fins 131 in the annular cavity 10, on the one hand, the disturbance of the flow of the heat-conducting fluid can be increased, thereby further increasing the actual flow rate of the heat-conducting fluid, and then further improving the heat exchange capacity of the heat-conducting fluid. On the other hand, it is conducive to achieving a uniform distribution of the temperature field in the annular cavity 10, avoiding regional flow stagnation and the generation of heat exchange dead zones. Further, at least one of the inner surface of the shell 11 and the outer surface of the heat-conducting pipe 13 is convexly provided with the first heat-conducting fins 131. Thereby, it is convenient to realize the arrangement of each first heat-conducting fin 131 in the annular cavity 10. Preferably, the first heat-conducting fin 131 is arranged on the outer surface of the heat-conducting pipe 13. In this way, when the first heat-conducting fin 131 is arranged on the outer surface of the heat-conducting pipe 13, the external heat exchange area of ​​the heat-conducting pipe 13 can be increased, thereby improving the heat exchange efficiency of the heat-conducting fluid.

[0034] Furthermore, an annular gap is left between the inner surface of the heat-conducting pipe 13 and the heating pipe 12 along the circumferential direction, and second heat-conducting fins 132 are protruded in the annular gap on the inner surface of the heat-conducting pipe 13 along its own length direction, and the second heat-conducting fins 132 are arranged at intervals along the circumferential direction of the heating pipe 12. By adding the second heat-conducting fins 132 on the inner surface of the heat-conducting pipe 13, on the one hand, the internal heat exchange area of ​​the heat-conducting pipe 13 can be increased, and on the other hand, the radiation heat exchange capacity between the heat-conducting pipe 13 and the heating pipe 12 can be enhanced, thereby improving the heating efficiency of the heating pipe 12, and then improving the heat exchange efficiency of the heat-conducting fluid.

[0035] Preferably, the first heat-conducting fin 131 is integrally convexly provided on the outer surface of the heat-conducting pipe 13, so that the internal structure of the heating unit 1 can be compact, and by respectively providing the first heat-conducting fin 131 and the second heat-conducting fin 132 on both side surfaces of the heat-conducting pipe 13, the radiation heat exchange capacity between the heat-conducting pipe 13 and the heating pipe 12 and the convection heat exchange capacity between the heat-conducting pipe 13 and the heat-conducting fluid can be fully enhanced. In this embodiment, the heat-conducting pipe 13, the first heat-conducting fin 131 and the second heat-conducting fin 132 are an integral part.

[0036] Further preferably, the shell 11 and the heat pipe 13 are both arranged with the heating pipe 12 as the center, so as to better ensure uniform distribution of the temperature field and better avoid regional flow stagnation and the generation of heat exchange dead zones.

[0037] Furthermore, the above-mentioned heating unit 1 is arranged in the horizontal direction, and the upper and lower sides of the shell 11 of the heating unit 1 are respectively provided with an upper fluid port 111 and a lower fluid port 112 for the circulation of the heat transfer fluid at intervals along the length direction. The above-mentioned heating unit 1 is at least two and arranged in parallel, and in two adjacent heating units 1, the lower fluid port 112 of one heating unit 1 is fluidically connected with the upper fluid port 111 of the other heating unit 1. When the heating power of the heating tube 12 and the flow area of ​​the annular cavity 10 are determined, the temperature rise of the heat transfer fluid of a single heating unit 1 is determined, so that by setting a certain number of heating units 1, the heat transfer fluid can be heated to the expected temperature rise (for example, heated to 500°C). In this embodiment, the above-mentioned heating tube 12 is a quartz heating tube 12, and the heating power per meter is 6 to 8KW.

[0038] Furthermore, at least two of the above-mentioned heating units 1 are stacked up and down to form an installation unit, and the lower fluid port 112 of each heating unit 1 in the installation unit is fluidly connected with the upper fluid port 111 of another heating unit 1 adjacent to the heating unit 1 below.

[0039] In this embodiment, specifically, there are three installation units, including a first installation unit 2, a second installation unit 3, and a third installation unit 4, which are arranged side by side in sequence. Among them, each upper fluid port 111 of the heating unit 1 at the uppermost end of the first installation unit 2 is respectively used for the heat transfer fluid to flow in, and each lower fluid port 112 of the heating unit 1 at the lowermost end of the first installation unit 2 is respectively used for the heat transfer fluid to flow out, and is respectively in fluid communication with each lower fluid port 112 of the heating unit 1 at the lowermost end of the second installation unit 3. Each upper fluid port 111 of the heating unit 1 at the uppermost end of the second installation unit 3 is respectively in fluid communication with each upper fluid port 111 of the heating unit 1 at the uppermost end of the third installation unit 4, and each lower fluid port 112 of the heating unit 1 at the lowermost end of the third installation unit 4 is used for the heat transfer fluid to flow out. Each installation unit is composed of multiple heating units 1 connected in series up and down, and the corresponding upper fluid inlet 111 and lower fluid inlet 112 are used to realize the up and down flow of the heat transfer fluid between adjacent heating units 1, thereby ensuring the uniform distribution and sufficient flow of the heat transfer fluid, eliminating the regional flow stagnation and the generation of heat exchange dead zones, and ensuring the uniformity of the temperature field distribution.

[0040] Furthermore, it also includes a storage tank 5 for storing heat transfer fluid and located above each of the above-mentioned installation units, a fluid inlet 81 for the heat transfer fluid to flow in, and a fluid outlet 82 for the heat transfer fluid to flow out, wherein the outlet end of the above-mentioned storage tank 5 is in fluid communication with the above-mentioned fluid inlet 81, and each upper fluid inlet 111 of the heating unit 1 at the uppermost end of one of the installation units located on the side constitutes the above-mentioned fluid inlet 81, and each lower fluid inlet 112 of the heating unit 1 at the lowermost end of another installation unit located on the side constitutes the above-mentioned fluid outlet 82 or is in fluid communication with the above-mentioned fluid outlet 82, and the fluid outlet 82 is located at the lowest point. In this way, the heat transfer fluid can flow smoothly into each installation unit, wherein the fluid outlet 82 is set at the lowest point, so that after the heating is completed, all the heat transfer fluid can be fully discharged by using the low-level siphon function. Preferably, the above-mentioned installation units are arranged opposite to each other, and each lower fluid outlet 112 of the heating unit 1 at the lower end of the side installation unit is connected to a vertically extending flow guide pipe 9, and the lower pipe opening of the flow guide pipe 9 constitutes the above-mentioned fluid outlet 82, thereby better ensuring the output of the heated heat transfer fluid.

[0041] In this embodiment, specifically, the outlet end of the storage tank 5 is connected to the fluid inlet 81 via an input pipe 6 , and adjacent installation units are connected via a connecting pipe 7 .

[0042] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two components or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected to each other, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A thermal fluid heater, characterized in that: The heating unit (1) comprises a tubular outer shell (11), a heat conducting pipe (13) passing through the outer shell (11) along the length direction, and a heating pipe (12) passing through the heat conducting pipe (13); an annular cavity (10) for accommodating a heat conducting fluid is formed circumferentially between the inner surface of the outer shell (11) and the outer surface of the heat conducting pipe (13); and an annular gap is left circumferentially between the heat conducting pipe (13) and the heating pipe (12).

2. The thermally conductive fluid heater according to claim 1, characterized in that: First heat-conducting fins (131) are arranged at intervals in the annular cavity (10) along its length direction, and the first heat-conducting fins (131) are arranged at intervals along the circumference of the annular cavity (10).

3. The thermally conductive fluid heater according to claim 2, characterized in that: The first heat-conducting fins (131) are arranged on the outer surface of the heat-conducting pipe (13).

4. The thermally conductive fluid heater according to claim 2, characterized in that: Second heat-conducting fins (132) are protruded in the annular gap on the inner surface of the heat-conducting pipe (13) at intervals along its length direction, and the second heat-conducting fins (132) are arranged at intervals along the circumference of the heat-conducting pipe (13).

5. The thermally conductive fluid heater according to claim 4, characterized in that: The first heat-conducting fin (131) is integrally protruded on the outer surface of the heat-conducting pipe (13).

6. The thermally conductive fluid heater according to any one of claims 1 to 5, characterized in that: The shell (11) and the heat conducting pipe (13) are both arranged with the heating pipe (12) as the center.

7. The thermally conductive fluid heater according to any one of claims 1 to 5, characterized in that: The heating unit (1) is arranged in a horizontal direction, and an upper fluid port (111) and a lower fluid port (112) for circulating a heat-conducting fluid are provided at intervals along the length direction on the upper and lower sides of the housing (11) of the heating unit (1). The above-mentioned heating units (1) are at least two arranged in parallel, and among the two adjacent heating units (1), the lower fluid port (112) of one heating unit (1) is fluidically connected with the upper fluid port (111) of the other heating unit (1).

8. The thermally conductive fluid heater according to claim 7, characterized in that: At least two of the heating units (1) are stacked up and down to form an installation unit, and the lower fluid port (112) of each heating unit (1) in the installation unit is fluidically connected to the upper fluid port (111) of another heating unit (1) disposed adjacent to the heating unit (1). The above-mentioned installation units are at least three, including a first installation unit (2), a second installation unit (3) and a third installation unit (4) which are arranged side by side in sequence, wherein the upper fluid inlets (111) of the heating unit (1) at the uppermost end of the first installation unit (2) are respectively used for the inflow of heat-conducting fluid, and the lower fluid inlets (112) of the heating unit (1) at the lowermost end of the first installation unit (2) are respectively used for the outflow of heat-conducting fluid, and are respectively fluidly connected with the lower fluid inlets (112) of the heating unit (1) at the lowermost end of the second installation unit (3), and the upper fluid inlets (111) of the heating unit (1) at the uppermost end of the second installation unit (3) are respectively fluidly connected with the upper fluid inlets (111) of the heating unit (1) at the uppermost end of the third installation unit (4), and the lower fluid inlets (112) of the heating unit (1) at the lowermost end of the third installation unit (4) are used for the outflow of heat-conducting fluid.

9. The thermally conductive fluid heater according to claim 8, characterized in that: It also includes a storage tank (5) for storing heat-conducting fluid and located above each of the above-mentioned installation units, a fluid inlet (81) for the heat-conducting fluid to flow in, and a fluid outlet (82) for the heat-conducting fluid to flow out, wherein the outlet end of the above-mentioned storage tank (5) is fluidically connected to the above-mentioned fluid inlet (81), and each upper fluid port (111) of the heating unit (1) at the uppermost end of one of the installation units located at the side constitutes the above-mentioned fluid inlet (81), and each lower fluid port (112) of the heating unit (1) at the lowermost end of another installation unit located at the side constitutes the above-mentioned fluid outlet (82) or is fluidically connected to the above-mentioned fluid outlet (82), and the fluid outlet (82) is located at the lowest point.

10. The thermally conductive fluid heater according to claim 9, characterized in that: The installation units are arranged opposite to each other in sequence, and each lower fluid port (112) of the heating unit (1) at the lower end of the installation unit on the side is connected to a vertically extending flow guide pipe (9), and the lower pipe port of the flow guide pipe (9) constitutes the above-mentioned fluid outlet (82).

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