Calcium carbide waste heat recovery system based on heat pipe and fused salt heat storage

Abstract

The invention discloses a calcium carbide waste heat recovery system based on heat pipes and fused salt heat storage, and relates to the technical field of waste heat recovery equipment, the calcium carbide waste heat recovery system comprises a calcium carbide container, a calcium carbide transport vehicle, a fused salt heat storage module, a calcium carbide heat extraction module and a steam generator, the fused salt heat storage module comprises a low-temperature fused salt storage tank and a high-temperature fused salt storage tank, the calcium carbide cooling device is reasonable in design and simple in principle, can be effectively used for cooling calcium carbide and achieves the waste heat recovery function, the cooling heat exchange mode adopts contact type heat exchange and is more efficient, the safety is obviously improved through the heat exchange mode of the heat pipes and application of inert media, and the service life of the calcium carbide cooling device is prolonged. In addition, the calcium carbide heat removal module 4 has the characteristic of modular design, interaction and arrangement of other components are very convenient, and meanwhile, the calcium carbide heat removal module 4 can be used for cooling treatment and waste heat recovery of other smelting slag with good fluidity.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery equipment, and in particular to a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage. Background Art

[0004] At present, some enterprises use tunnel kilns to recover calcium carbide waste heat, which mainly relies on convection heat transfer and some radiation heat. However, this method has high energy consumption, low waste heat recovery efficiency, and unstable quality of recovered waste heat, which is difficult to meet the production needs of high efficiency and energy saving. Summary of the invention

[0005] In response to the problems disclosed in the background technology, the present invention provides a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage is used for calcium carbide cooling and waste heat recovery in the calcium carbide production process, comprising a calcium carbide container and a calcium carbide transport vehicle. The molten calcium carbide is connected to the calcium carbide container after it comes out of the furnace. The calcium carbide container is installed on the calcium carbide transport vehicle and moves through a track that matches the calcium carbide transport vehicle. It is characterized in that it also includes a molten salt heat storage module, a calcium carbide heat extraction module and a steam generator.

[0008] The molten salt heat storage module includes a molten salt storage tank, and is divided into a low-temperature molten salt storage tank and a high-temperature molten salt storage tank according to the temperature of the molten salt therein. The calcium carbide heat extraction module is installed on the track where the calcium carbide container and the calcium carbide transport vehicle pass. The calcium carbide heat extraction module, the high-temperature molten salt storage tank, the steam generator, and the low-temperature molten salt storage tank are connected in sequence and end to end through pipelines, and the circulation of the molten salt therein is controlled by a molten salt pump.

[0009] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the number of the calcium carbide heat extraction modules is multiple groups, the multiple groups of calcium carbide heat extraction modules are arranged in parallel and are respectively connected to the low-temperature molten salt storage tank and the high-temperature molten salt storage tank.

[0010] The above-mentioned calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage, wherein the molten salt pump is divided into a low-temperature molten salt pump and a high-temperature molten salt pump. The low-temperature molten salt pump is arranged on the pipeline between the low-temperature molten salt storage tank and the calcium carbide heat extraction module, and is used to control the flow of low-temperature molten salt entering the calcium carbide heat extraction module to ensure the stability of the molten salt temperature entering the high-temperature molten salt storage tank; the high-temperature molten salt pump is arranged on the pipeline between the high-temperature molten salt storage tank and the steam generator, and is used to control the flow of high-temperature molten salt entering the steam generator to ensure the stability of waste heat recovery.

[0011] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the calcium carbide heat extraction module includes a heat exchange tube group and a lifting device, the heat exchange tube group is erected on the track through columns and lifting brackets, and is installed in the middle of the lifting bracket. The two ends of the lifting bracket are slidably matched with the columns, and the lifting device is installed on the columns and the lifting bracket to control the lifting of the lifting bracket and the heat exchange tube group thereon.

[0012] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the heat exchange tube group is composed of a plurality of heat pipe combinations, and a shell-and-tube heat exchanger for heat exchange is provided on the top of the heat pipe, and the shell-and-tube heat exchanger has a built-in channel for the flow of molten salt, and the channels between adjacent shell-and-tube heat exchangers are interconnected, and inlets and outlets connected to the low-temperature molten salt storage tank and the high-temperature molten salt storage tank are reserved at the head and tail respectively.

[0013] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the lifting device is a lifting cylinder, and the two ends of the lifting cylinder are respectively connected to the column and the lifting bracket to control the lifting and lowering of the lifting bracket and the heat exchange tube group thereon.

[0014] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the lifting device is composed of a driving device, a driving gear and a fixed rack, the driving device is a driving motor, fixedly mounted on the lifting bracket, the driving gear is fixedly mounted on the transmission shaft of the driving device, the fixed rack is fixedly mounted on the column and meshed with the driving gear, and the lifting bracket and the heat exchange tube group thereon are controlled to rise and fall by the driving device.

[0015] The above-mentioned calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage, wherein the lifting device is composed of a driving device, a screw and a screw nut, the screw is rotatably set on the column, the screw nut is fixedly connected to the lifting bracket and cooperates with the screw thread, the driving device is a driving motor, which is fixedly set on the column, and its transmission shaft is connected to one end of the screw, and the lifting and lowering of the lifting bracket and the heat exchange tube group thereon are controlled by the driving device.

[0016] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the calcium carbide heat extraction module also includes a sweeper, and the sweeper is fixedly installed under the lifting bracket through a column.

[0017] The above-mentioned calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the calcium carbide heat extraction module also includes a radiation heat exchange device, which is a membrane wall heat exchanger, which is arranged on both sides of the track and fixedly connected to the column.

[0018] Technical effects and advantages of the present invention:

[0019] The present invention discloses a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, relates to the technical field of waste heat recovery equipment, and is used for calcium carbide cooling and waste heat recovery in the calcium carbide production process. The system comprises a calcium carbide container, a calcium carbide transport vehicle, a molten salt heat storage module, a calcium carbide heat extraction module and a steam generator. The molten salt heat storage module comprises a low-temperature molten salt storage tank and a high-temperature molten salt storage tank. The calcium carbide heat extraction module comprises a heat exchange tube group and a lifting device. The present invention has a reasonable design and a simple principle, can be effectively used for calcium carbide cooling in the calcium carbide production process, and realizes the waste heat recovery function through the molten salt heat storage method. The cooling and heat exchange method adopts contact heat exchange, which is more efficient than the conventional circulating air convection method. The heat exchange form of the heat pipe and the application of inert medium significantly improve the safety, are more conducive to the subsequent calcium carbide crushing link, and overcome the problem of thermal pollution in the conventional process. In addition, the calcium carbide heat extraction module 4 has a modular design feature, and the interaction and arrangement of other components are also very convenient. At the same time, it can also be used for the cooling treatment and waste heat recovery of other smelting slags with good fluidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the principle of the present invention.

[0021] Figure 2 Schematic diagram of the heat pipe.

[0022] Figure 3 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group descending state, Example 3.1).

[0023] Figure 4 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group rising state, Example 3.1).

[0024] Figure 5 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group descending state, Example 3.2).

[0025] Figure 6 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group rising state, Example 3.2).

[0026] Figure 7 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group descending state, Example 3.3).

[0027] Figure 8 Schematic diagram of the calcium carbide heat extraction module (heat exchange tube group rising state, Example 3.3).

[0028] Fig. 9 It is a schematic diagram of the radiation heat exchange device (heat exchange tube group descending state).

[0029] Fig.10 It is a schematic diagram of the radiation heat exchange device (heat exchange tube group rising state).

[0030] Among them, the figure markings are as follows: 1. Calcium carbide container; 2. Calcium carbide transport vehicle; 3. Molten salt heat storage module; 4. Calcium carbide heat extraction module; 5. Steam generator; 6. Low-temperature molten salt storage tank; 7. High-temperature molten salt storage tank; 8. Heat exchange tube group; 9. Lifting device; 10. Column; 11. Lifting bracket; 12. Heat pipe; 13. Shell and tube heat exchanger; 14. Inlet; 15. Outlet; 16. Lifting cylinder; 17. Drive device; 18. Drive gear; 19. Fixed rack; 20. Screw; 21. Screw nut; 22. Sweeper; 23. Radiation heat exchange device; 24. Low-temperature molten salt pump; 25. High-temperature molten salt pump. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] As shown in the figure, the present embodiment discloses a calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage, which is used for calcium carbide cooling and waste heat recovery in the calcium carbide production process, including a calcium carbide container 1 and a calcium carbide transport vehicle 2. After the molten calcium carbide comes out of the furnace, it is connected to the calcium carbide container 1. The calcium carbide container 1 is installed on the calcium carbide transport vehicle 2 and moves through a track matched with the calcium carbide transport vehicle 2 to transport the molten calcium carbide. It is characterized in that the calcium carbide waste heat recovery system also includes a molten salt heat storage module 3, a calcium carbide heat extraction module 4 and a steam generator 5;

[0034] The molten salt heat storage module 3 includes a molten salt storage tank, which stores molten salt for heat exchange, and is divided into a low-temperature molten salt storage tank 6 and a high-temperature molten salt storage tank 7 according to the temperature of the molten salt therein. The calcium carbide heat extraction module 4 is set up on the track where the calcium carbide container 1 and the calcium carbide transport vehicle 2 pass, and is used to cool and exchange heat with the molten calcium carbide in the calcium carbide container 1. The calcium carbide heat extraction module 4, the high-temperature molten salt storage tank 7, the steam generator 5, and the low-temperature molten salt storage tank 6 are connected in sequence and end to end through pipelines, and the molten salt circulation therein is controlled by a molten salt pump;

[0035] During operation, molten salt circulates in the calcium carbide waste heat recovery system, and the molten calcium carbide is transported to the calcium carbide heat extraction module 4 through the calcium carbide container 1 and the calcium carbide transport vehicle 2. The low-temperature molten salt flowing in the calcium carbide heat extraction module 4 exchanges heat with the molten calcium carbide, cools the molten calcium carbide, and turns into high-temperature molten salt, which flows into the high-temperature molten salt storage tank 7 at the rear end for temporary storage. The high-temperature molten salt in the high-temperature molten salt storage tank 7 is pumped out by a molten salt pump and sent to the steam generator 5 to release heat. After absorbing heat, the steam generator 5 generates steam (even superheated steam) for waste heat recovery and reuse. At the same time, the high-temperature molten salt is converted into low-temperature molten salt after releasing heat, flows into the low-temperature molten salt storage tank 6, and is pumped out by the molten salt pump and sent back to the calcium carbide heat extraction module 4, thereby completing the continuous cooling of the molten calcium carbide and the cyclic recovery of waste heat.

[0036] In order to meet the needs of calcium carbide cooling and actual production conditions, in this embodiment, the number of calcium carbide heat extraction modules 4 is multiple groups, and the multiple groups of calcium carbide heat extraction modules 4 are arranged in parallel and are respectively connected to the low-temperature molten salt storage tank 6 and the high-temperature molten salt storage tank 7, so that the cooling and waste heat recovery of multiple carts of calcium carbide can be completed at a time;

[0037] In addition, the molten salt pump is divided into a low-temperature molten salt pump 24 and a high-temperature molten salt pump 25. The low-temperature molten salt pump 24 is arranged on the pipeline between the low-temperature molten salt storage tank 6 and the calcium carbide heat extraction module 4, and is used to control the flow of the low-temperature molten salt entering the calcium carbide heat extraction module 4, thereby ensuring the stability of the molten salt temperature entering the high-temperature molten salt storage tank 7; the high-temperature molten salt pump 25 is arranged on the pipeline between the high-temperature molten salt storage tank 7 and the steam generator 5, and is used to control the flow of the high-temperature molten salt entering the steam generator 5, thereby ensuring the stability of waste heat recovery.

[0038] Example 2

[0039] The present embodiment discloses a calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage, the calcium carbide heat extraction module 4 includes a heat exchange tube group 8 and a lifting device 9 for controlling the lifting and lowering of the heat exchange tube group 8. Specifically, the heat exchange tube group 8 is erected on the track through a column 10 and a lifting bracket 11, and is installed in the middle of the lifting bracket 11, corresponding to the cooling and heat exchange operation position of the calcium carbide. The two ends of the lifting bracket 11 are slidably matched with the column 10. At the same time, the lifting device 9 is installed on the column 10 and the lifting bracket 11 to control the lifting and lowering of the lifting bracket 11 and the heat exchange tube group 8 thereon; the design is designed in accordance with the continuous operation characteristics of calcium carbide cooling. When calcium carbide cooling is required, the heat exchange tube group 8 is lowered through the lifting device 9, extended into the molten calcium carbide, contacted with it and cooled and exchanged heat. After the calcium carbide cooling is completed, the heat exchange tube group 8 can also be raised and reset through the lifting device 9, waiting for the next calcium carbide cooling operation, effectively improving the convenience of the actual use of the calcium carbide heat extraction module 4.

[0040] In addition, in order to prevent the molten salt flowing in the heat exchange tube group 8 from being solidified by cold when the calcium carbide is not cooled, the heat exchange tube group 8 is improved in this embodiment. Specifically, the heat exchange tube group 8 is composed of a plurality of heat pipes 12, and a shell and tube heat exchanger 13 for heat exchange is sleeved on the top of the heat pipe 12. The shell and tube heat exchanger 13 has a built-in channel for the flow of molten salt. The channels between adjacent shell and tube heat exchangers 13 are interconnected, and an inlet 14 and an outlet 15 are reserved at the head and tail for connecting to the low-temperature molten salt storage tank 6 and the high-temperature molten salt storage tank 7 respectively. In order to meet the technical requirements of the heat pipe 12, the inlet 14 and the outlet 15 can be connected to the metal hose through a connector, and then connected to the low-temperature molten salt storage tank 6 and the high-temperature molten salt storage tank 7;

[0041] The advantage of this design is that it improves the heat transfer path, and optimizes the original molten calcium carbide → molten salt (direct heat exchange) to molten calcium carbide → heat pipe 12 → molten salt flowing in the shell and tube heat exchanger 13 (indirect heat exchange). Due to the unidirectional heat conduction of the heat pipe 12, the heat dissipation area is small. Within a certain period of time, even if the heat exchange tube group 8 does not continuously receive heat replenishment, the molten salt flowing in the heat exchange tube group 8 can be guaranteed to continue to flow to avoid solidification, thereby affecting subsequent operations. At the same time, even if the system is shut down, the heat exchange tube group 8 can be emptied by quickly discharging the molten salt in the shell and tube heat exchanger 13 to avoid the molten salt from solidifying inside the heat exchange tube group 8. In addition, the working fluid of the heat pipe 12 should be naphthalene, thermal conductivity, NMP and other materials that do not react with calcium carbide to avoid the risk of accidents caused by the rupture of the heat pipe 12. At the same time, the rupture of a single or a few heat pipes 12 will not affect the work of other heat pipes 12 and the overall operation of the heat exchange tube group 8, and the molten salt will not leak, so that the cooling and heat exchange operation can be carried out continuously.

[0042] In addition, after the calcium carbide is cooled, the solidified calcium carbide has gaps left by the heat pipes 12, which is more conducive to the calcium carbide crushing process in the subsequent process of calcium carbide production.

[0043] Example 3

[0044] This embodiment discloses a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the lifting device 9 can realize the lifting and lowering of the heat exchange tube group 8 through a variety of design methods.

[0045] Example 3.1

[0046] First, the lifting device 9 is a lifting cylinder 16, and both ends of the lifting cylinder 16 are respectively connected to the column 10 and the lifting bracket 11 to control the lifting bracket 11 and the heat exchange tube group 8 thereon to rise and fall.

[0047] Example 3.2

[0048] Secondly, the lifting device 9 is composed of a driving device 17, a driving gear 18 and a fixed rack 19. The driving device 17 is a driving motor fixedly mounted on the lifting bracket 11. The driving gear 18 is fixedly mounted on the transmission shaft of the driving device 17. The fixed rack 19 is fixedly mounted on the column 10 and meshes with the driving gear 18. The lifting bracket 11 and the heat exchange tube group 8 thereon are controlled to rise and fall by the driving device 17.

[0049] Example 3.3

[0050] Thirdly, the lifting device 9 is composed of a driving device 17, a screw 20 and a screw nut 21. The screw 20 is rotatably set on the column 10. The screw nut 21 is fixedly connected to the lifting bracket 11 and threadedly cooperates with the screw 20. The driving device 17 is a driving motor, which is fixedly set on the column 10. Its transmission shaft is connected to one end of the screw 20. The lifting bracket 11 and the heat exchange tube group 8 thereon are controlled to rise and fall by the driving device 17.

[0051] Example 4

[0052] When calcium carbide is cooled, its temperature decreases and it solidifies and shrinks until cooling is completed. The area where the heat exchange tube group 8 contacts the calcium carbide is prone to adhesion of a small amount of solidified calcium carbide debris. Based on this, the present embodiment discloses a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, wherein the calcium carbide heat extraction module 4 also includes a sweeper 22, which is fixedly mounted under the lifting bracket 11 through a column 10, and is used to clean and remove slag from the cooling contact surface of the heat exchange tube group 8 to ensure subsequent heat exchange efficiency.

[0053] Specifically, the cleaner 22 may be a perforated scraper that matches the heat pipe 12. During the lifting process, the heat pipe 12 passes through the tube holes distributed on the perforated scraper to achieve the effect of cleaning and removing slag. At the same time, it has a certain guiding and positioning function.

[0054] Example 5

[0055] In order to avoid heat dissipation, increase the waste heat recovery rate, and enhance the waste heat recovery effect, the present embodiment discloses a calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage. Specifically, the calcium carbide heat extraction module 4 also includes a radiation heat exchange device 23, which is a membrane wall heat exchanger for collecting the radiant heat dissipated by the calcium carbide. The radiation heat exchange device 23 is fixed on both sides of the track by columns 10; during the actual calcium carbide cooling process, when the calcium carbide is cooled, the heating surface of the radiation heat exchange device 23 faces the direction of the calcium carbide transport vehicle 2, thereby completing the collection of radiant heat without affecting the movement of the calcium carbide transport vehicle 2 along the track.

[0056] Combining the above embodiments and the actual process of calcium carbide production, it is not difficult to find that the calcium carbide container in the above embodiments can directly adopt a calcium carbide pot, and the calcium carbide transport vehicle can also directly adopt a calcium carbide vehicle, which is directly adapted to the current calcium carbide production and processing equipment, that is, the calcium carbide waste heat recovery system can be directly mounted on the current calcium carbide production and processing equipment, and does not affect or change its slag discharge process. At the same time, it can also be used for the cooling treatment and waste heat recovery of other smelting slags with good fluidity, such as electric furnace slag, AOD slag, VOD slag, blast furnace slag, etc. In addition, according to actual use, the molten salt can also be replaced with heat transfer oil.

[0057] To sum up, the present invention has a reasonable design and a simple principle. It can be effectively used for cooling calcium carbide in the process of calcium carbide production, and realizes the waste heat recovery function through the molten salt heat storage method. The cooling and heat exchange method adopts contact heat exchange, which is more efficient than the conventional circulating air convection method. The heat exchange form of the heat pipe and the application of inert medium significantly improve the safety, and are more conducive to the subsequent calcium carbide crushing link, and overcome the problem of thermal pollution in conventional processes. In addition, the calcium carbide heat extraction module 4 has a modular design feature, and the interaction and arrangement of other components are also very convenient. At the same time, it can also be used for the cooling treatment and waste heat recovery of other smelting slags with good fluidity.

[0058] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can all be customized according to the description and the drawings.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A calcium carbide waste heat recovery system based on heat pipes and molten salt heat storage, used for calcium carbide cooling and waste heat recovery in the calcium carbide production process, comprising a calcium carbide container (1) and a calcium carbide transport vehicle (2), wherein the calcium carbide container (1) is mounted on the calcium carbide transport vehicle (2) and moves via a track matched with the calcium carbide transport vehicle (2), characterized in that: It also includes a molten salt heat storage module (3), a calcium carbide heat extraction module (4) and a steam generator (5); The molten salt heat storage module (3) comprises a molten salt storage tank, which is divided into a low-temperature molten salt storage tank (6) and a high-temperature molten salt storage tank (7) according to the temperature of the molten salt therein. The calcium carbide heat extraction module (4) is installed on a track where the calcium carbide container (1) and the calcium carbide transport vehicle (2) pass. The calcium carbide heat extraction module (4), the high-temperature molten salt storage tank (7), the steam generator (5), and the low-temperature molten salt storage tank (6) are connected in sequence and end to end through pipelines, and the circulation of the molten salt therein is controlled by a molten salt pump.

2. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 1 is characterized in that: The number of the calcium carbide heat extraction modules (4) is multiple groups, and the multiple groups of the calcium carbide heat extraction modules (4) are arranged in parallel and are respectively connected to the low-temperature molten salt storage tank (6) and the high-temperature molten salt storage tank (7).

3. A calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to any one of claims 1 or 2, characterized in that: The molten salt pump is divided into a low-temperature molten salt pump (24) and a high-temperature molten salt pump (25). The low-temperature molten salt pump (24) is arranged on the pipeline between the low-temperature molten salt storage tank (6) and the calcium carbide heat extraction module (4), and the high-temperature molten salt pump (25) is arranged on the pipeline between the high-temperature molten salt storage tank (7) and the steam generator (5).

4. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 1 is characterized in that: The calcium carbide heat extraction module (4) comprises a heat exchange tube group (8) and a lifting device (9); the heat exchange tube group (8) is mounted on a track through a column (10) and a lifting bracket (11), and is installed in the middle of the lifting bracket (11); the two ends of the lifting bracket (11) are slidably matched with the column (10); the lifting device (9) is installed on the column (10) and the lifting bracket (11) to control the lifting of the lifting bracket (11) and the heat exchange tube group (8) thereon.

5. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 4 is characterized in that: The heat exchange tube group (8) is composed of a plurality of heat pipes (12), the top of each heat pipe (12) is provided with a heat exchange shell and tube heat exchanger (13), the shell and tube heat exchanger (13) has a built-in channel for the flow of molten salt, the channels between adjacent shell and tube heat exchangers (13) are interconnected, and an inlet (14) and an outlet (15) are reserved at the head and tail for communication with a low-temperature molten salt storage tank (6) and a high-temperature molten salt storage tank (7), respectively.

6. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 5 is characterized in that: The lifting device (9) is a lifting cylinder (16), the two ends of which are respectively connected to the column (10) and the lifting bracket (11), and control the lifting and lowering of the lifting bracket (11) and the heat exchange tube group (8) thereon.

7. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 5 is characterized in that: The lifting device (9) is composed of a driving device (17), a driving gear (18) and a fixed rack (19); the driving device (17) is a driving motor fixedly mounted on the lifting bracket (11); the driving gear (18) is fixedly mounted on the transmission shaft of the driving device (17); the fixed rack (19) is fixedly mounted on the column (10) and meshes with the driving gear (18); the lifting bracket (11) and the heat exchange tube group (8) thereon are controlled to rise and fall by the driving device (17).

8. The calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to claim 5 is characterized in that: The lifting device (9) is composed of a driving device (17), a screw (20) and a screw nut (21); the screw (20) is rotatably arranged on the column (10); the screw nut (21) is fixedly connected to the lifting bracket (11) and threadedly matched with the screw (20); the driving device (17) is a driving motor fixedly arranged on the column (10); its transmission shaft is connected to one end of the screw (20); the lifting bracket (11) and the heat exchange tube group (8) thereon are controlled to rise and fall by the driving device (17).

9. A calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to any one of claims 6, 7 and 8, characterized in that: The calcium carbide heat extraction module (4) also includes a sweeper (22), and the sweeper (22) is fixedly installed below the lifting bracket (11) through a column (10).

10. A calcium carbide waste heat recovery system based on heat pipe and molten salt heat storage according to any one of claims 6, 7 and 8, characterized in that: The calcium carbide heat extraction module (4) further comprises a radiation heat exchange device (23), wherein the radiation heat exchange device (23) is a membrane wall heat exchanger, which is disposed on both sides of the track and is fixedly connected to the column (10).

Images