Multi-heat source waste heat recovery system

Abstract

The utility model discloses a kind of multi-heat source waste heat recovery systems, comprising: first temperature-increasing unit and second temperature-increasing unit;The first temperature-increasing unit uses low-temperature waste heat liquid to heat first road municipal water;The second temperature-increasing unit uses low-temperature, medium-temperature and high-temperature waste heat liquid to heat second road municipal water;Second road municipal water includes first branch road municipal water, second branch road municipal water and third branch road municipal water;High-temperature waste heat liquid exchanges heat to first branch road municipal water, medium-temperature waste heat liquid exchanges heat and re-heats to second branch road municipal water and third branch road municipal water, and low-temperature waste heat liquid is used to re-heat second branch road municipal water and third branch road municipal water after being heated by medium-temperature waste heat liquid;The low-temperature waste heat liquid of first temperature-increasing unit and second temperature-increasing unit is connected to cooling tower tank, and the utility model has the advantages of providing various heat municipal water.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery technology, specifically relating to a multi-heat source waste heat recovery system. Background Technology

[0002] In the early stages, waste heat or cold energy was directly emitted, causing localized heat island effects or cold pollution. Traditional waste heat recovery systems rely on a single energy source, resulting in high operating costs and large carbon emissions. They also suffer from problems such as unreasonable heat exchange design and large heat losses, leading to insufficient extraction or low transfer efficiency of waste heat. They only recover high-temperature waste heat while neglecting medium- and low-temperature waste heat. Furthermore, some municipal water systems have different temperature requirements. To provide municipal water at different temperatures, a multi-heat source waste heat recovery system is proposed. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this utility model proposes a multi-heat source waste heat recovery system, which has the advantage of providing municipal water with multiple heat sources.

[0005] The multi-heat source waste heat recovery system according to an embodiment of the present invention includes: a first heating unit and a second heating unit; the first heating unit uses a low-temperature waste heat liquid to heat a first branch of municipal water; the second heating unit uses low-temperature, medium-temperature, and high-temperature waste heat liquids to heat a second branch of municipal water; the second branch of municipal water includes a first branch of municipal water, a second branch of municipal water, and a third branch of municipal water; the high-temperature waste heat liquid performs heat exchange on the first branch of municipal water, the medium-temperature waste heat liquid performs heat exchange and reheating on the second and third branch of municipal water, and the low-temperature waste heat liquid is used to reheat the second and third branch of municipal water after being heated by the medium-temperature waste heat liquid; the low-temperature waste heat liquids of the first heating unit and the second heating unit are both connected to the cooling tower pool.

[0006] According to one embodiment of the present invention, the first heating unit includes a first plate heat exchanger and a plurality of first magnetic levitation centrifugal heat pumps. The plurality of first magnetic levitation centrifugal heat pumps and the first plate heat exchanger are connected in parallel using a first cooling tube, and the plurality of first magnetic levitation centrifugal heat pumps and the first plate heat exchanger are connected in series using a first heating tube.

[0007] According to one embodiment of the present invention, the second heating unit includes a second plate heat exchanger, the second heating unit uses a second cooling pipe to transport high-temperature waste heat liquid to the second plate heat exchanger, and the second heating unit uses a second heating pipe to transport municipal water from the first branch to the second plate heat exchanger.

[0008] According to one embodiment of the present invention, the second heating unit further includes a third plate heat exchanger. The second heating unit uses a third cooling pipe to transport the first medium-temperature waste heat liquid to the third plate heat exchanger. The second heating unit uses a third heating pipe to transport the second branch municipal water to the third plate heat exchanger.

[0009] According to one embodiment of the present invention, the second heating unit further includes a fourth plate heat exchanger and a multi-stage heating device. The fourth plate heat exchanger and the multi-stage heating device are connected in series using a fourth heating pipe. The fourth heating pipe is used to transport municipal water from the third branch and municipal water from the second branch mixed with the multi-stage heating device. The fourth plate heat exchanger and the multi-stage heating device are connected in parallel using a fourth cooling pipe. The fourth cooling pipe is used to transport a second medium-temperature waste heat liquid.

[0010] According to one embodiment of the present invention, the multi-stage heating device is divided into a first-stage heating device, a second-stage heating device, and a third-stage heating device. The first-stage heating device, the second-stage heating device, and the third-stage heating device are connected in series with a fifth cooling pipe. The fifth cooling pipe is used to transport the second medium-temperature waste heat liquid after it has been cooled by the third-stage heating device, so that the second medium-temperature waste heat liquid enters the second-stage heating device and the first-stage heating device in sequence.

[0011] According to one embodiment of the present invention, the second heating unit further includes a second magnetic levitation centrifugal heat pump, and the second magnetic levitation centrifugal heat pump and the first cooling pipe are connected in parallel using a sixth cooling pipe.

[0012] According to one embodiment of the present invention, the number of the first heating units is multiple, and the multiple first heating units are connected in parallel.

[0013] According to one embodiment of the present invention, both the second plate heat exchanger and the fourth plate heat exchanger are connected to a fifth plate heat exchanger to ensure that the output temperature of the high-temperature waste heat liquid and the second medium-temperature waste heat liquid after cooling is the required temperature.

[0014] According to one embodiment of the present invention, the first-stage heating device, the second-stage heating device and the third-stage heating device each include multiple third magnetic levitation centrifugal heat pumps, and the multiple third magnetic levitation centrifugal heat pumps of each heating device are connected in parallel with a seventh cooling tube.

[0015] The beneficial effects of this utility model are that it uses a first heating unit and a second heating unit to generate municipal water at different temperatures, and controls the output temperature of the second municipal water by controlling the input of low-temperature waste heat liquid, thus meeting the temperature requirements of various municipal water sources. At the same time, since the second municipal water source uses waste heat water at various temperatures for heating, the output temperature of the first municipal water source is increased by the second municipal water source to meet the temperature requirements of the municipal water source, while ensuring the low energy consumption of the first heating unit.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which: Figure 1 This is a schematic diagram of the overall structure of this utility model, which highlights the heating and cooling processes of the first heating unit. Figure 2 This is a schematic diagram highlighting the second cooling tube and the second heating tube of this utility model; Figure 3 This is a schematic diagram highlighting the third cooling tube and the third heating tube of this utility model; Figure 4 This is a schematic diagram showing the fourth heating tube and the fourth cooling tube of this utility model. Figure 5 This is a schematic diagram highlighting the fifth cooling tube of this utility model; Figure 6 This is a schematic diagram highlighting the sixth cooling tube of this utility model; Figure label: 11. First plate heat exchanger; 12. First magnetic levitation centrifugal heat pump; 13. First cooling tube; 14. First heating tube; 21. Second plate heat exchanger; 22. Fifth plate heat exchanger; 23. Second cooling tube; 24. Second heating tube; 31. Third plate heat exchanger; 32. Third cooling tube; 33. Third heating tube; 41. Fourth plate heat exchanger; 42. Fourth heating tube; 43. Fourth cooling tube; 44. First stage Heating device; 441, Third magnetic levitation centrifugal heat pump A; 442, Third magnetic levitation centrifugal heat pump B; 443, Third magnetic levitation centrifugal heat pump C; 45, Secondary heating device; 451, Third magnetic levitation centrifugal heat pump D; 452, Third magnetic levitation centrifugal heat pump E; 46, Tertiary heating device; 461, Third magnetic levitation centrifugal heat pump F; 47, Fifth cooling pipe; 51, Second magnetic levitation centrifugal heat pump; 52, Sixth cooling pipe. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The multi-heat source waste heat recovery system of this utility model is described in detail below with reference to the accompanying drawings.

[0023] like Figures 1-6 As shown, the multi-heat source waste heat recovery system according to an embodiment of the present invention includes: a first heating unit and a second heating unit; the first heating unit uses low-temperature waste heat liquid to heat a first branch of municipal water; the second heating unit uses low-temperature, medium-temperature, and high-temperature waste heat liquids to heat a second branch of municipal water; the second branch of municipal water includes a first branch of municipal water, a second branch of municipal water, and a third branch of municipal water; the high-temperature waste heat liquid performs heat exchange on the first branch of municipal water, the medium-temperature waste heat liquid performs heat exchange and reheating on the second and third branch of municipal water, and the low-temperature waste heat liquid is used to reheat the second and third branch of municipal water after being heated by the medium-temperature waste heat liquid; the low-temperature waste heat liquids of the first heating unit and the second heating unit are both connected to the cooling tower pool.

[0024] In this embodiment, the low-temperature waste heat liquid of the second heating unit can be controlled to enter or stop entering the second heating unit as needed. That is, the municipal water in the second and third branches, after being heated by the medium-temperature waste heat liquid, can be directly mixed with the municipal water in the first branch and output at the first preset temperature. Alternatively, the municipal water in the second and third branches, after being heated by the medium-temperature waste heat liquid, can be further heated by the low-temperature waste heat liquid before being mixed with the municipal water in the first branch and output at the second preset temperature. In addition, the second and first branches of municipal water can be output separately. Since the first branch of municipal water is only heated by the low-temperature waste heat liquid, if low energy consumption is ensured, the temperature output to the first branch of municipal water will be slightly lower than the output temperature of the second branch of municipal water. Therefore, the first heating unit and the second heating unit can output different temperatures, or they can be mixed and output at the same temperature. Since the low-temperature waste heat liquid from both the first and second heating units flows into the cooling tower pool, the low-temperature waste heat liquid utilized by the first heating unit mixes with the low-temperature waste heat liquid required by the second heating unit. Therefore, even if the second heating unit does not use the low-temperature waste heat liquid, it will not significantly affect the temperature of the low-temperature waste heat liquid, which can be cooled within the cooling tower pool. The use of the first and second heating units enables the generation of municipal water at different temperatures, and the output temperature of the second municipal water is controlled by adjusting the input of the low-temperature waste heat liquid, thus meeting the temperature requirements of various municipal water sources. Furthermore, since the second municipal water supply uses waste water of various temperatures for heating, it raises the output temperature of the first municipal water supply to meet the temperature requirements of the municipal water while ensuring low energy consumption of the first heating unit.

[0025] The first heating unit includes a first plate heat exchanger 11 and multiple first magnetic levitation centrifugal heat pumps 12. The multiple first magnetic levitation centrifugal heat pumps 12 and the first plate heat exchanger 11 are connected in parallel using a first cooling pipe 13, and the multiple first magnetic levitation centrifugal heat pumps 12 and the first plate heat exchanger 11 are connected in series using a first heating pipe 14.

[0026] In this embodiment, there are eight first magnetic levitation centrifugal heat pumps 12. The first cooling pipe 13 introduces the 37°C low-temperature waste heat liquid into the first plate heat exchanger 11 and the eight first magnetic levitation centrifugal heat pumps 12, respectively. This allows the first municipal water to be initially heated by the first plate heat exchanger 11 and then further heated by the first magnetic levitation centrifugal heat pumps 12, reaching a temperature of 82.2°C. The low-temperature waste heat liquid output from the first magnetic levitation centrifugal heat pumps 12 is mixed with the low-temperature waste heat liquid output from the first plate heat exchanger 11 and then output to enter the next cycle.

[0027] The second heating unit includes a second plate heat exchanger 21. The second heating unit uses a second cooling pipe 23 to transport high-temperature waste heat liquid to the second plate heat exchanger 21. The second heating unit uses a second heating pipe 24 to transport municipal water from the first branch to the second plate heat exchanger 21.

[0028] The second plate heat exchanger 21 and the fourth plate heat exchanger 41 are both connected to the fifth plate heat exchanger 22 to ensure that the output temperature of the high-temperature waste heat liquid and the second medium-temperature waste heat liquid after cooling is the required temperature.

[0029] In this embodiment, the second cooling pipe 23 introduces the high-temperature waste heat liquid at 84.7°C into the second plate heat exchanger 21 to exchange heat with the municipal water in the first branch, so as to form the municipal water in the first branch at 82.7°C and the high-temperature waste heat liquid at 35°C. If the temperature of the high-temperature waste heat liquid is 35°C, it will operate normally. If it is higher than 35°C, the fifth plate heat exchanger 22 will be started to use the low-temperature water connected to the fifth plate heat exchanger 22 for further cooling to ensure the output temperature of the high-temperature waste heat liquid.

[0030] The second heating unit also includes a third plate heat exchanger 31. The second heating unit uses a third cooling pipe 32 to transport the first medium-temperature waste heat liquid to the third plate heat exchanger 31. The second heating unit uses a third heating pipe 33 to transport the second branch municipal water to the third plate heat exchanger 31.

[0031] In this embodiment, the third cooling pipe 32 introduces the first medium-temperature waste heat liquid at 63°C into the third plate heat exchanger 31 to exchange heat with the municipal water in the second branch, so as to form the municipal water in the second branch at 61°C and the first medium-temperature waste heat liquid at 40°C.

[0032] The second heating unit also includes a fourth plate heat exchanger 41 and a multi-stage heating device. The fourth plate heat exchanger 41 and the multi-stage heating device are connected in series with a fourth heating pipe 42. The fourth heating pipe 42 is used to transport the municipal water from the third branch and the municipal water from the second branch mixed into the multi-stage heating device. The fourth plate heat exchanger 41 and the multi-stage heating device are connected in parallel with a fourth cooling pipe 43. The fourth cooling pipe 43 is used to transport the second medium-temperature waste heat liquid.

[0033] In this embodiment, the fourth cooling pipe 43 transports the 50°C second medium-temperature waste heat liquid to the fourth plate heat exchanger 41 and the multi-stage heating device respectively. The second medium-temperature waste heat liquid entering the fourth plate heat exchanger 41 exchanges heat with the municipal water of the third branch, forming a 35°C second medium-temperature waste heat liquid and a 48°C third branch municipal water. The 48°C third branch municipal water then enters the multi-stage heating device for further heating, where it mixes with the 61°C second branch municipal water.

[0034] Furthermore, the multi-stage heating device is divided into a primary heating device 44, a secondary heating device 45, and a tertiary heating device 46. The primary heating device 44, the secondary heating device 45, and the tertiary heating device 46 are connected in series by a fifth cooling pipe 47. The fifth cooling pipe 47 is used to transport the second medium-temperature waste heat liquid after it has been cooled by the tertiary heating device 46, so that the second medium-temperature waste heat liquid enters the secondary heating device 45 and the primary heating device 44 in sequence.

[0035] In this embodiment, the fifth cooling pipe 47 sequentially introduces the 50°C second medium-temperature waste heat liquid into the multi-stage heating device, then into the third-stage heating device 46, the second-stage heating device 45, and the first-stage heating device 44 for layer-by-layer cooling, and finally outputs a 35.3°C second medium-temperature waste heat liquid mixed with a 35°C second medium-temperature waste heat liquid.

[0036] Each of the first-stage heating device 44, the second-stage heating device 45, and the third-stage heating device 46 includes multiple third magnetic levitation centrifugal heat pumps, with each heating device's multiple third magnetic levitation centrifugal heat pumps connected in parallel using a seventh cooling tube. The first-stage heating device 44 includes a third magnetic levitation centrifugal heat pump A441, a third magnetic levitation centrifugal heat pump B442, and two third magnetic levitation centrifugal heat pumps C443; the second-stage heating device 45 includes two third magnetic levitation centrifugal heat pumps D451 and two third magnetic levitation centrifugal heat pumps E452; and the third-stage heating device 46 includes three third magnetic levitation centrifugal heat pumps F461. Specifically, the third magnetic levitation centrifugal heat pumps A441, B442, and C443 are connected in parallel using a seventh cooling tube; the two third magnetic levitation centrifugal heat pumps D451 and E452 are connected in parallel using a seventh cooling tube; and the three third magnetic levitation centrifugal heat pumps F461 are connected in parallel using a seventh cooling tube.

[0037] The 48°C municipal water from the third branch, output from the fourth plate heat exchanger 41, sequentially enters the third magnetic levitation centrifugal heat pumps A441 and B442. It then mixes with the 61°C municipal water from the second branch and subsequently enters the two third magnetic levitation centrifugal heat pumps C443, D451, E452, and F461, forming municipal water at 85°C. This staggered arrangement reduces the temperature difference between the municipal water and the waste water in each of the third magnetic levitation centrifugal heat pumps, thus saving energy.

[0038] The second heating unit also includes a second magnetic levitation centrifugal heat pump 51, and the second magnetic levitation centrifugal heat pump 51 and the first cooling pipe 13 are connected in parallel using a sixth cooling pipe 52.

[0039] In this embodiment, when the second magnetic levitation centrifugal heat pump 51 needs to operate, the sixth cooling pipe 52 introduces low-temperature waste heat liquid at 37°C into both the second magnetic levitation centrifugal heat pump 51 and the first cooling pipe 13, so that the second magnetic levitation centrifugal heat pump 51 can continue to heat the municipal water at 85°C, and then mix it with the municipal water in the first branch at 82.7°C to reach the required temperature. If the second magnetic levitation centrifugal heat pump 51 does not need to operate, the sixth cooling pipe 52 only introduces low-temperature waste heat liquid at 37°C into the first cooling pipe 13.

[0040] There are multiple first heating units, which are connected in parallel. The high-temperature municipal water generated by the multiple first heating units can be output separately or mixed before being output.

[0041] The first magnetic levitation centrifugal heat pump 12, the second magnetic levitation centrifugal heat pump 51, and the third magnetic levitation centrifugal heat pump are all connected to municipal water via branch pipelines. This municipal water is supplied to the economizers of the first magnetic levitation centrifugal heat pump 12, the second magnetic levitation centrifugal heat pump 51, and the third magnetic levitation centrifugal heat pump to cool the compressors of the first magnetic levitation centrifugal heat pump 12, the second magnetic levitation centrifugal heat pump 51, and the third magnetic levitation centrifugal heat pump. The water is then mixed with the municipal water output from the condensers of the corresponding first magnetic levitation centrifugal heat pump 12, the second magnetic levitation centrifugal heat pump 51, and the third magnetic levitation centrifugal heat pump before entering the evaporator.

[0042] The specific structure of the magnetic levitation centrifugal heat pump described in this application is described in more detail in Chinese Invention Patent CN119983554B, all of which is incorporated herein by reference.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-heat-source waste heat recovery system, characterized in that, include: The first heating unit uses low-temperature waste heat liquid to heat the first municipal water supply line. The second heating unit uses low-temperature, medium-temperature, and high-temperature waste heat liquids to heat the second municipal water supply line. The second municipal water supply line includes a first branch municipal water supply line, a second branch municipal water supply line, and a third branch municipal water supply line. The high-temperature waste heat liquid exchanges heat with the first branch municipal water supply line, the medium-temperature waste heat liquid exchanges heat with and reheats the second and third branch municipal water supply lines, and the low-temperature waste heat liquid is used to reheat the second and third branch municipal water supply lines after they have been heated by the medium-temperature waste heat liquid. The low-temperature waste heat liquid from both the first and second heating units is connected to the cooling tower pool.

2. The multi-heat source waste heat recovery system according to claim 1, characterized in that, The first heating unit includes a first plate heat exchanger (11) and a plurality of first magnetic levitation centrifugal heat pumps (12). The plurality of first magnetic levitation centrifugal heat pumps (12) and the first plate heat exchanger (11) are connected in parallel by a first cooling tube (13), and the plurality of first magnetic levitation centrifugal heat pumps (12) and the first plate heat exchanger (11) are connected in series by a first heating tube (14).

3. The multi-heat source waste heat recovery system according to claim 2, characterized in that, The second heating unit includes a second plate heat exchanger (21). The second heating unit uses a second cooling pipe (23) to transport high-temperature waste heat liquid to the second plate heat exchanger (21). The second heating unit uses a second heating pipe (24) to transport municipal water from the first branch to the second plate heat exchanger (21).

4. The multi-heat source waste heat recovery system according to claim 3, characterized in that, The second heating unit also includes a third plate heat exchanger (31). The second heating unit uses a third cooling pipe (32) to transport the first medium-temperature waste heat liquid to the third plate heat exchanger (31). The second heating unit uses a third heating pipe (33) to transport the second branch municipal water to the third plate heat exchanger (31).

5. The multi-heat source waste heat recovery system according to claim 4, characterized in that, The second heating unit also includes a fourth plate heat exchanger (41) and a multi-stage heating device. The fourth plate heat exchanger (41) and the multi-stage heating device are connected in series with a fourth heating pipe (42). The fourth heating pipe (42) is used to transport municipal water from the third branch and municipal water from the second branch mixed into the multi-stage heating device. The fourth plate heat exchanger (41) and the multi-stage heating device are connected in parallel with a fourth cooling pipe (43). The fourth cooling pipe (43) is used to transport the second medium-temperature waste heat liquid.

6. The multi-heat source waste heat recovery system according to claim 5, characterized in that, The multi-stage heating device is divided into a first-stage heating device (44), a second-stage heating device (45), and a third-stage heating device (46). The first-stage heating device (44), the second-stage heating device (45), and the third-stage heating device (46) are connected in series with a fifth cooling pipe (47). The fifth cooling pipe (47) is used to transport the second medium-temperature waste heat liquid after it has been cooled by the third-stage heating device (46), so that the second medium-temperature waste heat liquid enters the second-stage heating device (45) and the first-stage heating device (44) in sequence.

7. The multi-heat source waste heat recovery system according to claim 6, characterized in that, The second heating unit also includes a second magnetic levitation centrifugal heat pump (51), and the second magnetic levitation centrifugal heat pump (51) and the first cooling pipe (13) are connected in parallel using a sixth cooling pipe (52).

8. The multi-heat source waste heat recovery system according to claim 2, characterized in that, There are multiple first heating units, and these multiple first heating units are connected in parallel.

9. The multi-heat source waste heat recovery system according to claim 5, characterized in that, The second plate heat exchanger (21) and the fourth plate heat exchanger (41) are both connected to the fifth plate heat exchanger (22) to ensure that the output temperature of the high-temperature waste heat liquid and the second medium-temperature waste heat liquid after cooling is the required temperature.

10. The multi-heat source waste heat recovery system according to claim 6, characterized in that, The first-stage heating device (44), the second-stage heating device (45) and the third-stage heating device (46) all include multiple third magnetic levitation centrifugal heat pumps, and the multiple third magnetic levitation centrifugal heat pumps of each heating device are connected in parallel with a seventh cooling tube.

Images