A marine steam exhaust heat power generation system

Abstract

The application provides a ship steam waste heat power generation system, which comprises a first circulation pipeline, an evaporator, a power generation unit and a heat source unit. The first circulation pipeline is connected with a first medium; the evaporator comprises a first heat carrier pipeline, and the first heat carrier pipeline is connected with a second medium; after the first circulation pipeline is connected with the evaporator, the second medium in the first heat carrier pipeline heats the first medium in the first circulation pipeline, and the first medium is heated to a gaseous state, so that the first medium is output after completing gasification and pressure increase in the evaporator; the power generation unit comprises an expander and a generator, and the expander rotates under the push of the first medium to drive the generator to generate power. The application can isolate impurities and stabilize heat transfer through double-stage indirect heat exchange, can recover waste heat in stages, can avoid seawater corrosion, and can improve system reliability, heat energy utilization rate and service life.

Description

Technical Field

[0001] This application relates to the field of marine energy utilization technology, and more specifically, to a marine steam waste heat power generation system. Background Technology

[0002] Traditional waste heat recovery systems on ships rely on high-temperature steam to drive steam turbine generators to generate electricity from waste heat. This approach offers significant advantages in waste heat utilization efficiency, but it operates under stringent conditions, requiring a sufficient supply of high-temperature steam. Currently, the total amount of waste heat from ship exhaust is continuously decreasing, and the steam production from exhaust boilers is insufficient, making traditional steam turbine power generation solutions unable to meet actual operational requirements and thus unsuitable for direct application.

[0003] Currently, steam generated by ships is mainly used for heating heavy fuel oil. With the ongoing global push for carbon reduction policies and the increasing adoption of new clean fuels for ships, the consumption of heavy fuel oil in ships will gradually decrease, while the proportion of clean fuel applications will continue to rise. Consequently, the demand for steam heating in ships will decrease, and the amount of surplus steam in the system will increase accordingly. At that time, the waste heat from ship exhaust gas can be used to generate steam for power generation in exhaust gas boilers, thereby reducing the fuel consumption of ship generator sets.

[0004] Considering the significant application value of waste heat recovery power generation systems: on the one hand, waste heat recovery can reduce the consumption of traditional fossil fuels by ships, effectively controlling operating energy costs; on the other hand, the utilization of waste heat resources can reduce greenhouse gas emissions, helping ships meet environmental regulations and avoid related penalties; simultaneously, waste heat recovery enables cascaded energy reuse, improving the overall energy efficiency of ships and further enhancing the economic benefits of ship operation. Therefore, there is an urgent need for a ship steam waste heat power generation system to achieve the recovery and utilization of steam. Summary of the Invention

[0005] The purpose of this application is to provide a ship steam waste heat power generation system, which isolates impurities and stabilizes heat transfer through two-stage indirect heat exchange, recovers waste heat in stages, avoids seawater corrosion, and improves system reliability, thermal energy utilization and service life.

[0006] This application provides a ship steam waste heat power generation system, including:

[0007] A first circulation pipeline, through which a first medium is introduced;

[0008] An evaporator includes a first heat carrier pipeline, through which a second medium flows. The temperature of the second medium is greater than that of the first medium, and the boiling point of the second medium is greater than that of the first medium. After the first circulation pipeline is connected to the evaporator, the second medium in the first heat carrier pipeline heats the first medium in the first circulation pipeline and heats the first medium to a gaseous state, so that the first medium is vaporized and pressurized in the evaporator before being output.

[0009] The power generation unit includes an expander and a generator, with the expander being driven by the generator. The expander includes a medium inlet and a medium outlet. The first circulation pipeline inputs the first medium flowing out of the evaporator into the expander through the medium inlet. The expander rotates under the drive of the first medium to drive the generator to generate electricity.

[0010] A heat source unit includes a second heat carrier pipeline through which a third medium flows. A second circulation pipeline is provided between the first heat carrier pipeline and the heat source unit. The second circulation pipeline is connected to both the first heat carrier pipeline and the heat source unit to form a circulation loop. The second medium circulates between the first heat carrier pipeline and the second circulation pipeline. After the second circulation pipeline is connected to the heat source unit, the second medium in the second circulation pipeline exchanges heat with the third medium in the second heat carrier pipeline.

[0011] The third medium is ship steam.

[0012] In one feasible embodiment, the heat source unit includes a steam inlet and a steam outlet, the steam inlet being used to input ship steam into the second heat carrier pipeline, and the steam outlet being used to output ship steam after heat exchange is completed.

[0013] In one feasible embodiment, an auxiliary heating unit is provided on the second circulation pipeline. The auxiliary heating unit includes a third heat carrier pipeline for introducing cylinder liner water. The cylinder liner water in the third heat carrier pipeline exchanges heat with the second medium in the second circulation pipeline. The second circulation pipeline first heats the second medium through the auxiliary heating unit and then heats it through the heat source unit.

[0014] In one feasible embodiment, a preheating unit is provided on the first circulation pipeline, the preheating unit including a fourth heat carrier pipeline for introducing cylinder liner water. The cylinder liner water in the fourth heat carrier pipeline is used to preheat the first medium in the first circulation pipeline to a preset temperature.

[0015] In one feasible embodiment, the preheating unit includes a fifth heat carrier pipeline for introducing ship steam. When the temperature of the first medium after preheating by the preheating unit is lower than a preset temperature, the first medium in the first circulation pipeline is preheated by the ship steam in the fifth heat carrier pipeline.

[0016] In one feasible embodiment, a condenser is provided on a first circulation line at the medium outlet of the expander. The condenser includes a cold carrier line, and a first medium in the first circulation line exchanges heat with a cooling medium in the cold carrier line so that the first medium changes from a gaseous state to a liquid state and is then recirculated to the evaporator.

[0017] In one feasible embodiment, the cooling medium in the cold carrier pipeline is seawater, the cold carrier pipeline is connected to a third circulation pipeline, the third circulation pipeline is used to introduce seawater into the cold carrier pipeline, and a third circulation pump is installed on the third circulation pipeline.

[0018] In one feasible embodiment, a first circulation pump is provided on the first circulation pipeline for driving the circulation of a first medium; and a second circulation pump is provided on the second circulation pipeline for driving the circulation of a second medium.

[0019] In one feasible approach, the first medium is an organic medium.

[0020] In one feasible embodiment, the first medium is pentafluoropropane; the second medium is ethanol; and the cooling medium is ethylene glycol.

[0021] Compared with the prior art, the beneficial effects of this application are as follows:

[0022] In the technical solution of this application, a two-stage indirect heat exchange structure is set up through the evaporator and the heat source unit. The heat source such as ship steam is effectively isolated from the first circulation pipeline, which prevents impurities, corrosive components and solid particles entrained in the steam from entering the turbine and internal power generation pipeline. This avoids the abrasion, scaling and blockage of precision moving parts such as the expander, significantly reduces the failure probability of core equipment, and ensures the cleanliness and long-term stable operation of the power generation cycle.

[0023] By using a second medium for indirect heat exchange, a thermal buffer layer can be formed between the heat source unit and the first circulation pipeline, effectively suppressing the fluctuations in steam temperature and flow caused by the variable operating conditions of the ship's main engine, keeping the thermodynamic state of the working fluid entering the turbine relatively stable, thereby improving the adaptability of this application to complex operating conditions of ships and ensuring the stability of power generation efficiency and power output.

[0024] Through the synergistic effect of the auxiliary heating unit and the preheating unit, the waste heat of different grades of ships is recovered and utilized in stages, which fully taps the utilization potential of waste heat resources, improves the overall thermal energy utilization rate, reduces the ship's consumption of traditional auxiliary energy, and achieves the technical objectives of energy conservation, consumption reduction and emission reduction.

[0025] By indirectly exchanging heat between the seawater heat exchanger and the first circulation pipeline through the cold carrier pipeline, the problems of electrochemical corrosion, biofouling, and salt scale deposition caused by the direct entry of seawater into the first circulation pipeline are fundamentally avoided. This allows the maintenance scope of the system to be concentrated on the seawater heat exchanger and the cold carrier pipeline, facilitating the use of highly corrosion-resistant materials for reinforcement and protection at the seawater heat exchanger and the cold carrier pipeline. This significantly enhances the operational reliability of this application and extends the service life of the entire power generation system.

[0026] The second medium possesses comprehensive characteristics such as being non-toxic, non-flammable, environmentally friendly, easily flowing, having a low specific heat capacity, and a high boiling point. It not only meets the stringent requirements for safe ship operation and environmental protection, but also maintains a stable liquid phase state within a wide operating temperature range, ensuring the high efficiency and controllability of the heat exchange process and reducing the operational safety risks of the system.

[0027] The overall system adopts a modular closed-loop design, with each unit organically connected by pipelines. It has a compact structure and flexible layout, making it easy to install, inspect and maintain in the confined space of a ship. This comprehensively improves the engineering practicality, operational reliability and economy of the ship's waste heat recovery power generation system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a ship steam waste heat power generation system according to an embodiment of the present invention.

[0029] Figure 2 This is another structural schematic diagram of the ship steam waste heat power generation system according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the fifth heat carrier pipeline in a ship steam waste heat power generation system according to an embodiment of the present invention.

[0031] The reference numerals in the attached figures are explained as follows:

[0032] 1. First circulation pipeline; 2. Evaporator; 3. First heat carrier pipeline; 4. Expander; 5. Generator; 6. Second heat carrier pipeline; 7. Second circulation pipeline; 8. Steam inlet; 9. Steam outlet; 10. Auxiliary heating unit; 11. Third heat carrier pipeline; 12. Preheating unit; 13. Fourth heat carrier pipeline; 14. Fifth heat carrier pipeline; 15. Condenser; 16. Cold carrier pipeline; 17. Third circulation pipeline; 18. Third circulation pump; 19. First circulation pump; 20. Second circulation pump; 21. Seawater heat exchanger. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0034] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0036] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] See Figures 1 to 3 This application provides a ship steam waste heat power generation system. When the ship steam waste heat power generation system is put into operation, a first medium is introduced into the first circulation pipe 1. The first medium is a low-boiling-point organic working fluid, such as pentafluoropropane, R245fa, or isobutane. An evaporator 2 is provided with a first heat carrier pipe 3, into which a second medium is introduced. The second medium is a liquid intermediate heat transfer medium, such as ethanol, heat transfer oil, or an aqueous solution of ethylene glycol. The temperature and boiling point of the second medium are higher than those of the first medium, thereby enabling the second medium in the first heat carrier pipe 3 to continuously release heat to the first medium in the first circulation pipe 1.

[0038] After the first circulation pipeline 1 is connected to the evaporator 2, the first medium absorbs heat and vaporizes into high-pressure steam, completing the vaporization and pressurization process. The vaporized first medium is then transported through the first circulation pipeline 1 to the medium inlet of the expander 4, driving the expander 4 to rotate and driving the generator 5 to generate electricity, converting thermal energy into electrical energy.

[0039] The impeller of expander 4 is connected to the rotor of generator 5 by means of a coupling, gearbox or belt drive, so as to transmit the mechanical work output by expander 4 to generator 5.

[0040] The heat source unit is equipped with a second heat carrier pipeline 6, which is used to connect to and transport ship steam as the third medium. The ship steam originates from heat source equipment such as boilers, exhaust economizers, or reactors. The first heat carrier pipeline 3 is connected to the heat source unit via a second circulation pipeline 7, and the second medium circulates between the second circulation pipeline 7 and the first heat carrier pipeline 3. The second medium in the second circulation pipeline 7 exchanges heat with the third medium in the second heat carrier pipeline 6, absorbing heat from the ship steam and then flowing back to the first heat carrier pipeline 3 of the evaporator 2, providing a heat source for the continuous vaporization of the first medium.

[0041] Through the aforementioned two-stage indirect heat exchange structure, the third medium is completely isolated from the first medium by the second medium. Hardness ions, dissolved oxygen, or solid impurities in the ship steam are blocked at the heat exchange interface of the heat source unit, preventing them from directly entering the evaporator 2 and contacting the first medium. This slows down the scaling and corrosion tendency on the heat exchange surface of the evaporator 2, reducing the frequency of maintenance due to blockage or corrosion. Simultaneously, the second medium acts as a thermal buffer during circulation, mitigating temperature and pressure fluctuations in the ship steam caused by changes in the main engine operating conditions. This results in relatively stable heat flow parameters transferred to the evaporator 2, making the vaporization process of the first medium more stable and controllable. This provides relatively stable operating conditions for the expander 4 and generator 5, improving the reliability of the power generation unit.

[0042] In one feasible embodiment, the heat source unit is provided with a steam inlet 8 and a steam outlet 9. The steam inlet 8 is used to input ship steam into the second heat carrier pipeline 6. After the third medium completes heat exchange with the second medium in the second circulation pipeline 7 in the second heat carrier pipeline 6, the ship steam with reduced temperature is discharged from the steam outlet 9 to subsequent steam-using equipment or condensate recovery device.

[0043] The second circulation pipe 7 is made of high-temperature resistant materials, such as stainless steel, nickel-based alloys, or titanium alloys. By confining the third medium within an independent heat source unit and the second circulation pipe 7, even if a leak occurs, the ship's steam is trapped in the second medium circulation loop, preventing contamination or corrosion of the first circulation pipe 1 and its accessories. Furthermore, during pipe maintenance, the heat source unit and the second circulation pipe 7 can be inspected separately without affecting the organic Rankine cycle of the first medium. Simultaneously, the heat source unit fully utilizes the heat of the ship's steam before cooling and discharging it, preventing high-temperature steam from being directly released into the environment and causing thermal pollution.

[0044] In one feasible embodiment, an auxiliary heating unit 10 is installed on the second circulation pipe 7. The auxiliary heating unit 10 includes a third heat carrier pipe 11, which is connected to the ship's engine and circulates cylinder liner water. The second circulation pipe 7 first passes through the auxiliary heating unit 10, where the cylinder liner water in the third heat carrier pipe 11 provides primary heating to the second medium within the second circulation pipe 7. The heated second medium then flows into the heat source unit for secondary heating. Through this two-stage stepped heating, the temperature of the second medium is increased before entering the heat source unit, thereby reducing the heating gradient of the second medium at the heat source unit, mitigating the thermal stress impact caused by excessive temperature differences, and making the heating process of the second medium more gradual. This helps extend the service life of the second circulation pipe 7 and the heat source unit, while also fully utilizing the waste heat of the engine cylinder liner cooling water to improve the overall thermal energy utilization rate of the ship.

[0045] In one feasible approach, such as Figure 1 and Figure 2 As shown, a preheating unit 12 is installed on the first circulation pipeline 1. The preheating unit 12 includes a fourth heat carrier pipeline 13, which is connected to the ship's engine and circulates cylinder liner water. The cylinder liner water in the fourth heat carrier pipeline 13 exchanges heat with the first medium in the first circulation pipeline 1, preheating the first medium to a preset temperature. By recovering the waste heat of the engine cylinder liner cooling water, the temperature of the first medium before entering the evaporator 2 is increased, thereby reducing the amount of heat required in the evaporator 2 to bring the first medium to its vaporization temperature. This makes the heat exchange load distribution in the evaporator 2 more reasonable, and the vaporization process of the first medium more stable, which helps to reduce the heat exchange area requirement of the evaporator 2 or improve the overall thermal efficiency of the system.

[0046] In one feasible approach, such as Figure 3 As shown, the preheating unit 12 also includes a fifth heat carrier pipeline 14, which is used to introduce ship steam. When the temperature of the first medium after preheating by the preheating unit 12 is lower than the preset temperature, the ship steam in the fifth heat carrier pipeline 14 supplements the preheating of the first medium in the first circulation pipeline 1, so that the first medium reaches the preset temperature. By supplementing the preheating method, it is possible to ensure that the first medium is stable at the target temperature before entering the evaporator 2 when the cylinder liner water has insufficient residual heat or the engine is running at low load. This avoids incomplete vaporization of the first medium in the evaporator 2 or a decrease in the dryness of the steam at the inlet of the expander 4 due to insufficient preheating, thereby ensuring the stability of the work capacity of the expander 4 and the output power of the generator 5.

[0047] In one feasible embodiment, a condenser 15 is installed on the first circulation pipeline 1 at the medium outlet of the expander 4. The condenser 15 includes a cold carrier pipeline 16 through which a cooling medium flows. The gaseous first medium in the first circulation pipeline 1 exchanges heat with the cooling medium in the cold carrier pipeline 16 within the condenser 15, releasing latent heat and condensing into a liquid state, which is then circulated back to the evaporator 2. The condenser 15 can be, for example, a shell-and-tube condenser, a plate condenser, or an air-cooled condenser. By installing the condenser 15, the gaseous first medium is rapidly condensed into a liquid state near the outlet of the expander 4, shortening the residence time and transport path of the gaseous working fluid in the pipeline, making it easier for the first medium to be transported by the first circulation pump 19, and ensuring the continuous operation of the closed-loop cycle.

[0048] It should be noted that the cooling medium is ethylene glycol.

[0049] The cold carrier pipeline 16 is connected to the seawater heat exchanger 21, and obtains the cold source through the seawater heat exchanger 21.

[0050] Specifically, such as Figure 1 and Figure 3 As shown, the seawater heat exchanger 21 includes a third circulation pipe 17, through which seawater medium is introduced, and the seawater medium in the third circulation pipe 17 exchanges heat with the cooling medium in the cold carrier pipe 16.

[0051] By connecting the cold carrier pipeline 16 to the seawater heat exchanger and setting up an external cooling circuit, seawater is effectively prevented from directly entering the first circulation pipeline, thus preventing adverse effects such as corrosion or blockage caused by seawater. This allows for targeted daily maintenance of the seawater heat exchanger and cold carrier pipeline, reducing the scope of maintenance. Furthermore, by using corrosion-resistant and durable materials for the seawater heat exchanger and corresponding seawater pipelines, the operational reliability of this application can be significantly increased, and the service life of the entire ship's waste heat recovery power generation system can be extended.

[0052] A third circulation pump 18 is installed on the cold carrier pipeline 16. The third circulation pump 18, such as a centrifugal pump, axial flow pump, or mixed flow pump, is used to ensure the cooling circulation of seawater. Utilizing seawater from the area where the ship is located as a cold source is convenient and inexpensive. Furthermore, the continuous operation of the third circulation pump 18 ensures a stable flow rate of the cooling medium in the condenser 15, maintaining the condensation pressure of the first medium within a reasonable range, which contributes to the efficient operation of the organic Rankine cycle.

[0053] In one feasible embodiment, the preheating unit 12 is located on the first circulation pipe 1 between the condenser 15 and the evaporator 2. The cylinder liner water in the fourth heat carrier pipe 13 exchanges heat with the liquid first medium from the condenser 15 in the first circulation pipe 1, preheating the first medium. By placing the preheating unit 12 between the condenser 15 and the evaporator 2, the lower-temperature first medium flowing out of the condenser 15 can pre-absorb the waste heat of the cylinder liner water, further recovering the heat of the engine cooling water, increasing the temperature of the first medium before entering the evaporator 2, reducing the heat exchange required by the evaporator 2, making the system heat distribution more reasonable, and helping to improve the waste heat recovery efficiency.

[0054] In one feasible embodiment, a first circulation pump 19, such as a centrifugal pump, gear pump, or canned motor pump, is installed on the first circulation pipeline 1 to pressurize and deliver the condensed liquid first medium to the evaporator 2, ensuring the circulation of the first medium in a closed loop. A second circulation pump 20, such as a centrifugal pump, gear pump, or canned motor pump, is installed on the second circulation pipeline 7 to drive the second medium to circulate between the second circulation pipeline 7 and the first heat carrier pipeline 3. The first medium is an organic medium; in this embodiment, the first medium is pentafluoropropane, which has a boiling point of approximately 15 degrees Celsius, suitable for forming an organic Rankine cycle within the waste heat temperature range of ship steam. The second medium is ethanol, which has a boiling point of 78 degrees Celsius, higher than that of pentafluoropropane, and is chemically stable, serving as an intermediate heat transfer medium to establish a stable heat transfer bridge between ship steam and the organic working medium.

[0055] In summary, by using the evaporator and heat source unit, a two-stage indirect heat exchange structure is set up, which effectively isolates the heat source such as ship steam from the first circulation pipeline. This prevents impurities, corrosive components and solid particles carried in the steam from entering the turbine and internal power generation pipeline, avoiding abrasion, scaling and blockage of precision moving parts such as the expander. This significantly reduces the failure probability of core equipment and ensures the cleanliness and long-term stable operation of the power generation cycle.

[0056] By using a second medium for indirect heat exchange, a thermal buffer layer can be formed between the heat source unit and the first circulation pipeline, effectively suppressing the fluctuations in steam temperature and flow caused by the variable operating conditions of the ship's main engine, keeping the thermodynamic state of the working fluid entering the turbine relatively stable, thereby improving the adaptability of this application to complex operating conditions of ships and ensuring the stability of power generation efficiency and power output.

[0057] Through the synergistic effect of the auxiliary heating unit and the preheating unit, the waste heat of different grades of ships is recovered and utilized in stages, which fully taps the utilization potential of waste heat resources, improves the overall thermal energy utilization rate, reduces the ship's consumption of traditional auxiliary energy, and achieves the technical objectives of energy conservation, consumption reduction and emission reduction.

[0058] By indirectly exchanging heat between the seawater heat exchanger 21 and the first circulation pipeline through the cold carrier pipeline 16, the problems of electrochemical corrosion, biofouling, and salt scale deposition caused by the direct entry of seawater into the first circulation pipeline are fundamentally avoided. This allows the maintenance scope of the system to be concentrated on the seawater heat exchanger 21 and the cold carrier pipeline 16, making it easier to use highly corrosion-resistant materials to strengthen the protection of the seawater heat exchanger 21 and the cold carrier pipeline 16. This significantly enhances the operational reliability of this application and extends the service life of the entire power generation system.

[0059] The second medium possesses comprehensive characteristics such as being non-toxic, non-flammable, environmentally friendly, easily flowing, having a low specific heat capacity, and a high boiling point. It not only meets the stringent requirements for safe ship operation and environmental protection, but also maintains a stable liquid phase state within a wide operating temperature range, ensuring the high efficiency and controllability of the heat exchange process and reducing the operational safety risks of the system.

[0060] The overall system adopts a modular closed-loop design, with each unit organically connected by pipelines. It has a compact structure and flexible layout, making it easy to install, inspect and maintain in the confined space of a ship. This comprehensively improves the engineering practicality, operational reliability and economy of the ship's waste heat recovery power generation system.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A ship steam waste heat power generation system, characterized in that, include: A first circulation pipeline, through which a first medium is introduced; An evaporator includes a first heat carrier pipeline, through which a second medium flows. The temperature of the second medium is greater than that of the first medium, and the boiling point of the second medium is greater than that of the first medium. After the first circulation pipeline is connected to the evaporator, the second medium in the first heat carrier pipeline heats the first medium in the first circulation pipeline and heats the first medium to a gaseous state, so that the first medium is vaporized and pressurized in the evaporator before being output. The power generation unit includes an expander and a generator, with the expander being driven by the generator. The expander includes a medium inlet and a medium outlet. The first circulation pipeline inputs the first medium flowing out of the evaporator into the expander through the medium inlet. The expander rotates under the drive of the first medium to drive the generator to generate electricity. A heat source unit includes a second heat carrier pipeline through which a third medium flows. A second circulation pipeline is provided between the first heat carrier pipeline and the heat source unit. The second circulation pipeline is connected to both the first heat carrier pipeline and the heat source unit to form a circulation loop. The second medium circulates between the first heat carrier pipeline and the second circulation pipeline. After the second circulation pipeline is connected to the heat source unit, the second medium in the second circulation pipeline exchanges heat with the third medium in the second heat carrier pipeline. The third medium is ship steam.

2. The ship steam waste heat power generation system according to claim 1, characterized in that, The heat source unit includes a steam inlet and a steam outlet. The steam inlet is used to input ship steam into the second heat carrier pipeline. After heat exchange is completed, the steam outlet is used to output ship steam.

3. The ship steam waste heat power generation system according to claim 1, characterized in that, An auxiliary heating unit is installed on the second circulation pipeline. The auxiliary heating unit includes a third heat carrier pipeline for introducing cylinder liner water. The cylinder liner water in the third heat carrier pipeline exchanges heat with the second medium in the second circulation pipeline. The second circulation pipeline first heats the second medium through the auxiliary heating unit and then heats it through the heat source unit.

4. The ship steam waste heat power generation system according to claim 1, characterized in that, A preheating unit is provided on the first circulation pipeline. The preheating unit includes a fourth heat carrier pipeline, which is used to introduce cylinder liner water. The cylinder liner water in the fourth heat carrier pipeline is used to preheat the first medium in the first circulation pipeline to a preset temperature.

5. The ship steam waste heat power generation system according to claim 4, characterized in that, The preheating unit includes a fifth heat carrier pipeline for introducing ship steam; when the temperature of the first medium after preheating by the preheating unit is lower than the preset temperature, the first medium in the first circulation pipeline is preheated by the ship steam in the fifth heat carrier pipeline.

6. The ship steam waste heat power generation system according to claim 1, characterized in that, A condenser is installed on the first circulation pipeline at the medium outlet of the expander. The condenser includes a cold carrier pipeline. The first medium in the first circulation pipeline exchanges heat with the cooling medium in the cold carrier pipeline so that the first medium changes from a gaseous state to a liquid state and then circulates back to the evaporator.

7. The ship steam waste heat power generation system according to claim 6, characterized in that, The cooling medium in the cold carrier pipeline is seawater. The cold carrier pipeline is connected to the third circulation pipeline, which is used to introduce seawater into the cold carrier pipeline. A third circulation pump is installed on the third circulation pipeline.

8. The ship steam waste heat power generation system according to claim 1, characterized in that, A first circulation pump is installed on the first circulation pipeline to drive the circulation of the first medium; a second circulation pump is installed on the second circulation pipeline to drive the circulation of the second medium.

9. The ship steam waste heat power generation system according to claim 1, characterized in that, The first medium is an organic medium.

10. The ship steam waste heat power generation system according to claim 9, characterized in that, The first medium is pentafluoropropane; the second medium is ethanol.

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