A graphitization system and method based on organic Rankine cycle

Abstract

The present invention discloses a graphitization system and method based on an organic Rankine cycle. The system includes a heating furnace, a power generation device and a cooling device. The cooling device includes an argon storage tank and a condenser. The condenser includes a condensation channel and an argon supply channel. Heat exchange can be performed between the condensation channel and the argon supply channel. The inlet of the condensation channel is connected to the outlet of the power generation device, and the outlet of the condensation channel is connected to the inlet of the power generation device. After the steam organic working medium expands and does work, the exhaust steam passes through the condensation channel to form a liquid organic working medium and enters the power generation device. The inlet and outlet of the argon supply channel are respectively connected to the argon storage tank and the heating furnace. The liquid argon is vaporized in the argon supply channel to form argon gas and then enters the heating furnace to form a protective gas. The present invention uses liquid argon supplied to the graphitization system to cool the exhaust steam into a liquid organic working medium, so that the working medium can be recycled, and the waste heat and cold generated in the graphite production process are effectively utilized, thereby further achieving cost reduction and efficiency improvement, and achieving the purpose of energy conservation and emission reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of graphitization, and in particular to a graphitization system and method based on an organic Rankine cycle. Background Art

[0002] Graphite heat dissipation film material has the advantages of thin volume, good toughness, high thermal conductivity, strong electrical conductivity, etc., and is widely used in the heat dissipation of electronic components. Please refer to Figure 1 At present, the process for preparing high thermal conductivity graphite film is as follows: a polyimide film (PI film) is carbonized at high temperature and then graphitized, and then a series of processes such as calendering are performed to obtain a high thermal conductivity graphite film.

[0003] The graphite film process is usually carried out in a high temperature environment of thousands of degrees Celsius. Due to the low quality of low-temperature waste heat in the graphite production process, the waste heat and cold are usually discharged into the ambient air on the current production line. This simple and crude practice is inconsistent with the energy-saving and emission-reduction society. Therefore, how to effectively utilize the waste heat and cold generated in the graphite production process to further achieve cost reduction and efficiency improvement has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a graphitization system and method based on an organic Rankine cycle, which solves the problem in the prior art that due to the low quality of low-temperature waste heat in the graphite production process, the waste heat and cold are usually discharged into the ambient air on the current production line. This simple and crude approach is inconsistent with the society's energy conservation and emission reduction.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A graphitization system based on an organic Rankine cycle includes a heating furnace and a power generation device, wherein the heating furnace is used to heat and graphitize materials under a protective gas atmosphere, and the power generation device converts a liquid organic working medium into a steam organic working medium, so that the steam organic working medium expands and performs work, and exhaust steam is output from an outlet of the power generation device;

[0007] The graphitization system further comprises:

[0008] A cooling device, comprising an argon storage tank and a condenser; the condenser comprises a condensation channel and an argon supply channel, the condensation channel and the argon supply channel are not connected to each other, and heat exchange can be performed between the condensation channel and the argon supply channel;

[0009] The inlet of the condensation channel is connected to the outlet of the power generation device, and the outlet of the condensation channel is connected to the inlet of the power generation device. After the exhaust steam is condensed through the condensation channel to form a liquid organic working medium, it is re-introduced into the power generation device;

[0010] The inlet of the argon supply channel is connected to the argon storage tank, and the outlet of the argon supply channel is connected to the heating furnace. After the liquid argon absorbs heat and vaporizes in the argon supply channel to form argon gas, it is introduced into the heating furnace to form the protective gas.

[0011] Optionally, the power generation device comprises a working fluid pump, an evaporator and an expander connected end to end, and the expander is connected to a generator;

[0012] The generator is connected to the working fluid pump and is used to supply power to the working fluid pump;

[0013] The generator is also connected to an inverter rectifier, a power grid and a battery. The inverter rectifier is used to rectify the excess AC power of the generator into DC power for storage, or to invert the DC power of the battery into AC power for use by electrical appliances or the power grid; the battery is used for energy storage.

[0014] Optionally, the graphitization system further includes a cooling tower and a water pump, and the generator is connected to the water pump to supply power to the water pump;

[0015] The inlet of the water pump is connected to the outlet of the cooling tower. A first heating channel is provided in the heating furnace. The outlet of the water pump is connected to the evaporator via the first heating channel.

[0016] Optionally, a second heating channel is provided in the evaporator, an inlet of the second heating channel is connected to an outlet of the water pump, and an outlet of the second heating channel is connected to an inlet of the cooling tower.

[0017] Optionally, a heat exchanger is further included, and the heat exchanger is arranged between the condenser and the heating furnace.

[0018] Optionally, the heat exchanger is a fin-tube heat exchanger.

[0019] Optionally, a regenerator is further included, wherein the regenerator includes a first regenerator channel;

[0020] The inlet of the first heat recovery channel is connected to the outlet of the expander, and the outlet of the first heat recovery channel is connected to the inlet of the condenser.

[0021] Optionally, the regenerator further includes a second heat regeneration channel, an inlet of the second heat regeneration channel is connected to an outlet of the working fluid pump, and an outlet of the second heat regeneration channel is connected to an inlet of the evaporator.

[0022] The present invention also provides a graphitization method based on an organic Rankine cycle, which is implemented by a graphitization system based on an organic Rankine cycle, wherein the graphitization system includes a heating furnace, a power generation device and a cooling device;

[0023] The heating furnace is used to heat and graphitize the material under the atmosphere of protective gas, and the power generation device converts the liquid organic working medium into steam organic working medium, so that the steam organic working medium expands and performs work, and the exhaust steam is output from the outlet of the power generation device;

[0024] The cooling device comprises an argon storage tank and a condenser, and the condenser comprises a condensation channel and an argon supply channel;

[0025] The graphitization method comprises:

[0026] Allowing the liquid organic working medium to evaporate in the power generation device to form a steam organic working medium, and expanding the steam organic working medium to generate power;

[0027] Outputting the exhaust steam from the outlet of the power generation device to the condensation channel, and passing the liquid argon in the argon storage tank into the argon supply channel, so that the steam organic working medium is condensed to form a liquid organic working medium, and the liquid argon is vaporized to form argon gas;

[0028] The liquid organic working medium is reintroduced into the power generation device; and the argon gas is introduced into the heating furnace to form the protective gas.

[0029] Optionally, the graphitization system further comprises a cooling tower, a water pump, and an evaporator disposed in the power generation device;

[0030] A second heating channel is provided in the evaporator, an inlet of the second heating channel is connected to an outlet of the water pump, and an outlet of the second heating channel is connected to an inlet of the cooling tower;

[0031] The graphitization method comprises:

[0032] Passing cooling water in the cooling tower into the heating furnace to form hot water at a first temperature;

[0033] The hot water at the first temperature is passed into the evaporator to release heat to form hot water at the second temperature, and at the same time, the liquid organic working medium absorbs heat and evaporates to form steam organic working medium;

[0034] The hot water at the second temperature is reintroduced into the cooling tower.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a graphitization system and method based on an organic Rankine cycle, which utilizes liquid argon supplied into the graphitization system to cool exhaust steam into a liquid organic working fluid, so that the working fluid can be recycled and the waste heat and waste cold generated in the graphite production process can be effectively utilized, thereby further reducing costs and increasing efficiency, and achieving the purpose of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 This is the schematic diagram of the graphitization process;

[0039] Figure 2 A schematic diagram of the structure of a graphitization system based on an organic Rankine cycle provided by the present invention;

[0040] Figure 3 A schematic flow chart of a graphitization method based on an organic Rankine cycle provided by the present invention;

[0041] Figure 4 Another schematic diagram of a process of a graphitization method based on an organic Rankine cycle provided by the present invention.

[0042] In the above figure: 10, working fluid pump; 11, regenerator; 12, evaporator; 13, expander; 21, argon storage tank; 22, condenser; 23, heat exchanger; 24, heating furnace; 30, cooling tower; 31, water pump; 41, generator; 42, electrical appliances; 43, inverter rectifier; 44, battery; 45, power grid; 51, liquid argon; 52, argon gas; 53, liquid organic working fluid; 54, steam organic working fluid; 55, exhaust steam. DETAILED DESCRIPTION

[0043] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0044] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0045] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0046] Graphite heat dissipation film materials have the advantages of thin volume, good toughness, high thermal conductivity, and strong electrical conductivity, and are widely used in heat dissipation of electronic components. At present, the process for preparing high thermal conductivity graphite film is: polyimide film (PI film) is carbonized at high temperature and then graphitized, and then a series of processes such as calendering are performed to obtain high thermal conductivity graphite film. The graphite film process is usually carried out in a high temperature environment of thousands of degrees Celsius. The added gas protection and cooling water system make its energy consumption and cost high. Reducing costs and increasing efficiency have become key issues that need to be urgently solved in the industry.

[0047] Due to the low quality of low-temperature waste heat in the graphite production process, the waste heat and cold are generally discharged into the ambient air in current production. Most of them use cooling towers to cool the cooling water and finned tubes to release the gas vaporization cold. This simple and crude approach is not in line with the energy-saving and emission-reduction society. Therefore, it is necessary to use heat recovery methods to reduce the thermal pollution effect, recover energy, and protect the environment.

[0048] The present invention aims to provide a graphitization scheme based on an organic Rankine cycle to effectively utilize the waste heat and waste cooling generated in the graphite production process, thereby achieving the purpose of energy conservation and emission reduction.

[0049] The organic Rankine cycle is introduced below:

[0050] Traditional thermal power generation technology makes it difficult to directly recycle and reuse water vapor Rankine cycle; while other temperature difference power generation technologies, waste heat heating and cooling methods can recycle low-temperature energy, their low efficiency and complex structure reduce their economic efficiency.

[0051] The Organic Rankine Cycle (ORC) system is an effective way to utilize low-grade waste heat energy: driven by a pump, the organic working fluid uses the discharged cooling water as a heat source, and the high-temperature and high-pressure steam working fluid generated enters the expander to expand and do work, and then enters the condenser to cool and condense to complete the cycle. The ORC system that uses low-grade waste heat recovery has the advantages of simple structure, high efficiency, simple maintenance, high safety, high mobility, environmental friendliness and strong adaptability. At the same time, the electricity generated by ORC can be used for its own load and can also be used to supply power to the external power grid, improving the economy of the system and reducing costs. Through the multi-energy coordinated control of ORC and the energy storage system, the heat energy generated by the traditional process is coupled to the electric energy and can be fed back to the system to form an efficient closed-loop system, while improving the reliability and economy of industrial electricity.

[0052] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0053] Please refer to Figure 2 The present invention provides a graphitization system based on an organic Rankine cycle, a heating furnace 24 and a cooling tower 30, which realizes continuous purification or continuous graphitization by induction heating the PI film to carbonize it in the heating furnace 24, or heating the carbonized film to graphitize it; and the cooling tower 30 is used to indirectly cool the high-temperature material by cooling water.

[0054] In this embodiment, the graphitization system further includes a power generation device, which includes a working fluid pump 10, an evaporator 12 and an expander 13 connected head to tail, and the expander 13 is connected to a generator 41. The power generation device is used to convert the liquid organic working fluid 53 into a steam organic working fluid 54, the steam organic working fluid 54 expands in the expander 13 to do work, and the generator 41 converts kinetic energy into electrical energy; the exhaust steam 55 is output from the outlet of the power generation device.

[0055] Among them, the generator 41 is connected to the electrical appliance 42, the inverter rectifier 43, the power grid 45 and the battery 44. The electrical appliance 42 is the working fluid pump 10, the water pump 31 or other AC power equipment. The inverter rectifier 43 rectifies the excess AC power of the generator 41 into DC power for storage, or inverts the DC power of the battery 44 into AC power for use by the electrical appliance 42 or the power grid 45. The battery 44 is used for energy storage.

[0056] Specifically, the working fluid is a single low-boiling point methane, ethane, propane or a mixture of multiple low-boiling point component hydrocarbons or ammonia. The working fluid pump 10 compresses and increases the pressure of the organic working fluid to drive the circulation; the evaporator 12 heats the liquid organic working fluid at a constant pressure at high temperature to become a dry saturated steam organic working fluid 54; after the high-temperature and high-pressure saturated steam organic working fluid 54 passes through the expander 13, the internal energy is converted into kinetic energy, thereby achieving the purpose of power supply.

[0057] Specifically, the evaporator 12 contains a heat storage material, which may be a single-phase liquid for sensible heat storage, or a crystallized hydrated salt or organic matter for phase change heat storage, for storing heat from the heat exchanger 23. The use of the heat storage material can stabilize the intermittent and discontinuous heat source storage in the system, thereby promoting the smooth operation of the Rankine cycle.

[0058] Considering that argon is often used as a protective gas in the graphitization system, and the boiling point of argon is about -185°C, it carries a large amount of high-quality cold and is an excellent cooling medium. Therefore, in this embodiment, liquid argon in the graphitization system is used as a cooling medium to achieve condensation of exhaust steam, realize the recycling of the working fluid, and then realize the continuous operation of the power generation device.

[0059] Specifically, the graphitization system provided in this embodiment also includes:

[0060] The cooling device includes an argon storage tank 21 and a condenser 22 .

[0061] Generally speaking, the condenser 22 contains a cold storage material, which can be a single-phase liquid for sensible heat storage, or a crystallized hydrated salt or organic matter of a solid-liquid phase change material. These cold storage materials are used to stabilize the intermittent and discontinuous cold and heat source storage in the system, and promote the smooth operation of the Rankine cycle. The argon storage tank 21 is a low-temperature insulated storage tank for storing low-temperature liquid argon 51, which is used to pass into the condenser 22.

[0062] Under low temperature conditions with a large amount of liquid argon 51, the low-temperature phase-change cold storage material releases heat and solidifies; under high temperature conditions with a small amount of liquid argon 51, the phase-change cold storage material melts the working fluid of the heat absorption condenser 22, so that the ORC system can still maintain a stable working state.

[0063] Specifically, the condenser 22 includes a condensation channel and an argon supply channel, the condensation channel and the argon supply channel are not connected to each other, and the condensation channel and the argon supply channel can perform heat exchange; the inlet of the condensation channel is connected to the outlet of the power generation device, and the outlet of the condensation channel is connected to the inlet of the power generation device. The exhaust steam 55 passes through the condensation channel to absorb the heat of the liquid argon 51 to obtain the latent heat of vaporization, and after condensation to form the liquid organic working medium 53, it is re-introduced into the power generation device.

[0064] Furthermore, the inlet of the argon supply channel is connected to the argon storage tank 21, and the outlet of the argon supply channel is connected to the heating furnace 24. When the exhaust steam 55 is condensed through the condensation channel, the liquid argon 51 absorbs heat and vaporizes to become argon gas 52, which is introduced into the heating furnace 24 and used as a protective gas in the graphitization system.

[0065] Furthermore, the graphitization system further includes a cooling tower 30. Since the heat source and the cold source energy have the characteristics of mismatch and non-correspondence, in order to prevent the cooling water from not being completely cooled down in the evaporator 12, when the circulating low-temperature working fluid is insufficient or the ORC system stops working, the cooling tower 30 starts working to ensure that the cooling water can still be cooled down, and to ensure that the supply of argon 52 and cooling water required for graphitization production is not affected by the start-stop and mismatch of the waste heat recovery device.

[0066] Since the cooling water in the cooling tower 30 is about 40° C. and has been preheated, if it is directly discharged into the environment, heat energy loss will occur.

[0067] Based on the above considerations, in this embodiment, the graphitization system also includes a water pump 31, the inlet of the water pump 31 is connected to the outlet of the cooling tower 30, a first heating channel is provided in the heating furnace 24, and the outlet of the water pump 31 is connected to the evaporator 12 via the first heating channel.

[0068] In addition, a second heating channel is provided in the evaporator 12 , the inlet of the second heating channel is connected to the outlet of the water pump 31 , and the outlet of the second heating channel is connected to the inlet of the cooling tower 30 .

[0069] The water pump 31 increases the pressure to drive the cooling water to flow. Driven by the water pump 31, the cooling water enters the heating furnace 24 to take away heat and cool down. The high-temperature hot water enters the evaporator 12, releases heat in the evaporator 12, and evaporates the circulating working medium to heat the working medium to a dry saturated steam state at a constant pressure. Then, the hot water still with residual temperature enters the cooling tower 30, and continues to enter the heating furnace 24 after being cooled in the cooling tower 30.

[0070] Under high temperature conditions with plenty of cooling water, the phase change thermal storage material melts and absorbs heat; under low temperature conditions with insufficient cooling water, the phase change thermal storage material solidifies at low temperature and releases heat to heat the working fluid of the evaporator 12, so that the ORC system continues to work.

[0071] Furthermore, in this embodiment, the graphitization system also includes a heat exchanger 23 and a regenerator 11 .

[0072] The heat exchanger 23 is provided between the condenser 22 and the heating furnace 24, and is a finned tube heat exchanger 23. Due to the characteristics of the mismatch of the energy of the heat source and the cold source and the mismatch of the use interval, in order to prevent the liquid argon 51 from absorbing insufficient heat in the condenser 22 and not being completely vaporized, thereby affecting the main production process of the graphite film, a finned tube heat exchanger 23 is added in this embodiment to ensure that when the ORC waste heat recovery system is not working, it can also absorb heat from the air and vaporize, thereby ensuring that the supply of argon 52 required for production is not affected by the waste heat recovery device.

[0073] In addition, the regenerator 11 includes a first regenerator channel; the inlet of the first regenerator channel is connected to the outlet of the expander 13, and the outlet of the first regenerator channel is connected to the inlet of the condenser 22. The regenerator 11 also includes a second regenerator channel, the inlet of the second regenerator channel is connected to the outlet of the working fluid pump 10, and the outlet of the second regenerator channel is connected, and heat exchange can be performed between the first regenerator channel and the second regenerator channel. The regenerator 11 is used to preheat the working fluid entering the expander 13 and cool the exhaust steam 55 passing through the expander 13, which is conducive to improving the cycle efficiency of the system.

[0074] The embodiment of the present invention recycles the relatively hot waste heat of cooling water, and utilizes the low-temperature argon gas 52 to realize the latent heat of vaporization of the working fluid, integrates the organic Rankine cycle system into the industrial graphitization system, realizes the reuse of low-grade waste heat energy, effectively reduces energy consumption and the thermal pollution effect in the graphitization industrial production, improves the production economy, and thus achieves the purpose of saving energy and protecting the environment.

[0075] The present invention also provides an organic Rankine cycle-based graphitization method according to an embodiment, which is implemented based on the organic Rankine cycle-based graphitization system provided in the above-mentioned embodiment.

[0076] Please refer to Figure 3 , graphitization methods include:

[0077] S11, evaporating the liquid organic working medium 53 in the power generation device to form a steam organic working medium 54, and expanding the steam organic working medium 54 to generate power;

[0078] S12, outputting the exhaust steam 55 from the outlet of the power generation device to the condensation channel, and passing the liquid argon 51 in the argon storage tank 21 into the argon supply channel, so that the exhaust steam 55 is condensed to form a liquid organic working medium 53, and at the same time, the liquid argon 51 is vaporized to form argon gas 52;

[0079] S13, the liquid organic working medium 53 is reintroduced into the power generation device; and the argon gas 52 is introduced into the heating furnace 24 as a protective gas.

[0080] Based on the steps S12 to S13, when the exhaust steam 55 is condensed through the condensation channel, the liquid argon 51 absorbs heat and vaporizes to become argon gas 52, and the argon gas 52 is introduced into the heating furnace 24 and used as a protective gas in the graphitization system.

[0081] Please refer to Figure 4 Furthermore, the graphitization method provided in this embodiment also includes:

[0082] S21, passing the cooling water in the cooling tower 30 into the heating furnace 24 to form hot water at a first temperature;

[0083] S22, passing the hot water at the first temperature into the evaporator 12 to release heat to form hot water at the second temperature, and at the same time, the liquid organic working medium 53 absorbs heat and evaporates to form steam organic working medium 54;

[0084] S23, reintroducing the hot water at the second temperature into the cooling tower 30.

[0085] Since the cooling water in the cooling tower 30 is about 40°C and has been preheated, if it is directly discharged into the environment, it will cause heat energy loss. In this method, the water pump 31 increases the pressure to drive the cooling water to flow. Driven by the water pump 31, the cooling water enters the heating furnace 24, takes away the heat and cools down. The high-temperature hot water enters the evaporator 12, releases heat in the evaporator 12, and evaporates the circulating liquid organic working medium 53, so as to heat the liquid organic working medium 53 to a dry saturated steam state at a constant pressure; then, the hot water still with residual temperature enters the cooling tower 30, and continues to enter the heating furnace 24 after cooling down in the cooling tower 30.

[0086] Based on steps S21 to S23, the waste heat of cooling water can be effectively utilized, thereby achieving the purpose of energy saving and emission reduction.

[0087] Based on the above embodiments, the implementation method of the present invention is as follows:

[0088] 1) The low-temperature organic liquid organic working medium 53 is pressurized by the working medium pump 10, and is preheated by the exhaust steam 55 with residual heat at the outlet of the expander 13 in the regenerator 11, and then is transported to the evaporator 12 for heating and evaporation; at the same time, the cooling water releases heat in the evaporator 12, and heats the liquid organic working medium 53 to a dry saturated steam state at a constant pressure. After the saturated steam organic working medium 54 enters the expander 13 to perform work, the exhaust steam 55 is initially cooled by the liquid organic working medium 53 with residual cooling at the outlet of the working medium pump 10 in the regenerator 11, and then enters the condenser 22, where it releases heat at a constant pressure and condenses into the liquid organic working medium 53; finally, driven by the working medium pump 10, it enters the regenerator 11 and the evaporator 12 again for heating and evaporation, thereby completing a working cycle.

[0089] 2) Liquid argon 51 is released from the valve of the argon storage tank 21, and absorbs heat through the condenser 22 to vaporize into argon gas 52, so as to condense the circulating exhaust steam 55. When the heat of the condenser 22 is insufficient for complete evaporation, the liquid argon 51 continues to release cold energy to the air through the heat exchanger 23, ensuring that the remaining liquid argon 51 is completely vaporized into argon gas 52 before entering the heating furnace 24. Under the atmosphere of the inert gas argon gas 52, the argon gas 52 protects and takes away the gas generated in the heating furnace 24.

[0090] 3) Driven by the water pump 31, the cooling water enters the heating furnace 24, takes away heat and cools down. The high-temperature hot water enters the evaporator 12 to evaporate the circulating liquid organic working medium 53. The hot water still with residual temperature enters the cooling tower 30, and continues to enter the heating furnace 24 after cooling down in the cooling tower 30.

[0091] 4) The generator 41 converts the kinetic energy of the expander 13 into electrical energy, transmits it to the power grid 45, and provides electrical energy to AC electrical appliances 42 such as the working fluid pump 10 and the water pump 31; when there is excess electrical energy, it is rectified by the inverter rectifier 43 and stored in the battery 44; when power generation is insufficient, the electrical appliances 42 are powered by the power grid 45 or the battery 44.

[0092] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A graphitization system based on an organic Rankine cycle, characterized in that: include: A heating furnace is used to heat and graphitize materials under a protective gas atmosphere; A power generation device, used for converting liquid organic working medium into steam organic working medium, causing the steam organic working medium to expand and perform work, and exhaust steam is output from an outlet of the power generation device; Also includes: A cooling device, comprising an argon storage tank and a condenser; the condenser comprises a condensation channel and an argon supply channel, the condensation channel and the argon supply channel are not connected to each other, and heat exchange can be performed between the condensation channel and the argon supply channel; The inlet of the condensation channel is connected to the outlet of the power generation device, and the outlet of the condensation channel is connected to the inlet of the power generation device. After the exhaust steam is condensed through the condensation channel to form a liquid organic working medium, it is re-introduced into the power generation device; The inlet of the argon supply channel is connected to the argon storage tank, and the outlet of the argon supply channel is connected to the heating furnace. After the liquid argon absorbs heat and vaporizes in the argon supply channel to form argon gas, it is introduced into the heating furnace to form the protective gas. The power generation device comprises a working fluid pump, an evaporator and an expander connected end to end, and also comprises a heat exchanger, wherein the heat exchanger is arranged between the condenser and the heating furnace; The evaporator contains a heat storage material, which is a single-phase liquid for sensible heat storage, or a crystallized hydrated salt or organic matter of a phase change heat storage material. The heat storage material is used to store the heat of the heat exchanger.

2. The graphitization system based on the organic Rankine cycle according to claim 1, characterized in that: The expander is connected to a generator; The generator is connected to the working fluid pump and is used to supply power to the working fluid pump; The generator is also connected to an inverter rectifier, a power grid and a battery. The inverter rectifier is used to rectify the excess AC power of the generator into DC power for storage, or to invert the DC power of the battery into AC power for use by electrical appliances or the power grid; the battery is used for energy storage.

3. The graphitization system based on organic Rankine cycle according to claim 2, characterized in that: The graphitization system further includes a cooling tower and a water pump; the generator is connected to the water pump to supply power to the water pump; The inlet of the water pump is connected to the outlet of the cooling tower. A first heating channel is provided in the heating furnace. The outlet of the water pump is connected to the evaporator via the first heating channel.

4. The graphitization system based on organic Rankine cycle according to claim 3, characterized in that: A second heating channel is provided in the evaporator, an inlet of the second heating channel is connected to an outlet of the water pump, and an outlet of the second heating channel is connected to an inlet of the cooling tower.

5. The graphitization system based on organic Rankine cycle according to claim 1, characterized in that: The heat exchanger is a fin-tube heat exchanger.

6. The graphitization system based on the organic Rankine cycle according to any one of claims 2 to 4, characterized in that: Also included is a regenerator, the regenerator comprising a first regenerator channel; The inlet of the first heat recovery channel is connected to the outlet of the expander, and the outlet of the first heat recovery channel is connected to the inlet of the condenser.

7. The graphitization system based on organic Rankine cycle according to claim 6, characterized in that: The regenerator further includes a second heat regeneration channel, an inlet of the second heat regeneration channel is connected to an outlet of the working fluid pump, and an outlet of the second heat regeneration channel is connected to an inlet of the evaporator.

8. A graphitization method based on an organic Rankine cycle, characterized in that: A graphitization system based on an organic Rankine cycle according to any one of claims 1 to 7 is implemented, wherein the graphitization system comprises a heating furnace, a power generation device and a cooling device; The heating furnace is used to heat and graphitize the material under the atmosphere of protective gas, and the power generation device converts the liquid organic working medium into steam organic working medium, so that the steam organic working medium expands and performs work, and the exhaust steam is output from the outlet of the power generation device; The cooling device comprises an argon storage tank and a condenser, and the condenser comprises a condensation channel and an argon supply channel; The graphitization method comprises: Allowing the liquid organic working medium to evaporate in the power generation device to form a steam organic working medium, and expanding the steam organic working medium to generate power; Outputting the exhaust steam from the outlet of the power generation device to the condensation channel, and passing the liquid argon in the argon storage tank into the argon supply channel, so that the exhaust steam is condensed to form a liquid organic working medium, and the liquid argon is vaporized to form argon gas; The liquid organic working medium is reintroduced into the power generation device; and the argon gas is introduced into the heating furnace to form the protective gas.

9. The graphitization method based on organic Rankine cycle according to claim 8, characterized in that: The graphitization system also includes a cooling tower, a water pump, and an evaporator disposed in the power generation device; A second heating channel is provided in the evaporator, the inlet of the second heating channel is connected to the outlet of the water pump, and the outlet of the second heating channel is connected to the inlet of the cooling tower; The graphitization method comprises: Passing cooling water in the cooling tower into the heating furnace to form hot water at a first temperature; The hot water at the first temperature is passed into the evaporator to release heat to form hot water at the second temperature, and at the same time, the liquid organic working medium absorbs heat and evaporates to form steam organic working medium; The hot water at the second temperature is reintroduced into the cooling tower.

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