Apparatus for conversion of exhaust energy of a marine diesel engine and method of operation thereof

Abstract

The application discloses a device for converting exhaust energy of a marine diesel engine and a working method thereof. The device for converting exhaust energy of a marine diesel engine comprises a turbine expander, a heat exchanger and a transmission member. The turbine expander comprises a volute, a turbine and a transmission shaft. The turbine is installed in the volute and separates the space in the volute into a first chamber and a second chamber. The volute has a first gas inlet and a first gas outlet. The volute also has a second gas inlet and a second gas outlet. The heat exchanger has a guide inlet, a guide outlet and a waste gas discharge port. The transmission shaft can drive a propeller shaft to rotate by the transmission member. The application can convert the energy of waste heat gas into mechanical energy for driving a ship to move for multiple times, so that the energy of waste heat gas is greatly utilized, the utilization rate of fuel is improved, and compared with driving by only using fuel, energy is greatly saved, and energy saving and emission reduction are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat gas utilization, in particular to a device for converting exhaust energy of a marine diesel engine and a working method thereof. BACKGROUND

[0002] Marine vessels are the most important means of transportation for goods and fishing in modern times. Marine vessels are mainly driven by fuel. It is well known that the thermal energy conversion efficiency of an internal combustion engine is about 40%, that is, more than half of the thermal energy cannot be utilized and is discharged into the atmosphere in the form of exhaust gas, which is usually at a temperature of more than 500°C, seriously polluting the atmosphere and exacerbating global warming, causing irreparable damage and loss to the living environment of future generations.

[0003] In order to alleviate the impact of exhaust gas from marine diesel engines on the environment and utilize exhaust energy, a turboexpander is currently used to convert the energy of waste heat gas. When the turboexpander is in use, the gas at a certain pressure is adiabatically expanded in the turboexpander and does work on the outside to convert the internal energy of the gas itself into mechanical energy. Most turboexpanders can only convert the energy of waste heat gas once. Since the energy of waste heat gas is limited during single conversion, the exhaust heat gas usually still has a relatively high temperature. Obviously, the existing turboexpander has a relatively low energy conversion rate of waste heat gas, and the energy-saving and emission-reducing effect is very small. SUMMARY

[0004] An advantage of the present application is to provide a device for converting exhaust energy of a marine diesel engine and a working method thereof. The present application can convert the energy of waste heat gas into mechanical energy that can propel the marine vessel to travel multiple times, so that the energy of waste heat gas can be utilized to a large extent, effectively avoiding the waste of energy of waste heat gas, improving the utilization rate of fuel, and greatly saving energy compared with driving only by fuel, thereby achieving energy saving and emission reduction.

[0005] An advantage of the present application is to provide a device for converting exhaust energy of a marine diesel engine and a working method thereof. The present application can convert the energy of waste heat gas into mechanical energy that can propel the marine vessel to travel multiple times, and the temperature of the finally discharged waste heat gas is lower than 100°, which effectively reduces the pollution degree of waste heat gas to the environment compared with directly discharging waste heat gas.

[0006] In order to achieve at least one of the above advantages of the present application, the present application provides a device for converting exhaust energy of a marine diesel engine, which is connected with a propeller shaft and an internal combustion engine. The internal combustion engine has an exhaust outlet. The device for converting exhaust energy of a marine diesel engine comprises:

[0007] A turbine expander, the turbine expander comprising a volute, a turbine and a transmission shaft, the transmission shaft being coaxially connected with the turbine and sealingly penetrating through the volute, the turbine being installed in the volute and separating a space in the volute into a first chamber and a second chamber, the volute having a first gas inlet and a first gas outlet communicating with the first chamber, the first gas inlet being directed towards the turbine, the first gas inlet being in communication with the exhaust gas outlet, the turbine being capable of being driven to rotate by the exhaust hot gas introduced from the first gas inlet and driving the transmission shaft to rotate, the first gas outlet being used for discharging the exhaust hot gas in the first chamber after completing the operation of driving the turbine to rotate, the volute further having a second gas inlet and a second gas outlet communicating with the second chamber, the second gas inlet being directed towards the turbine;

[0008] A heat exchanger, the heat exchanger having a gas inlet, a gas outlet and an exhaust gas outlet, the gas inlet being in communication with the first gas outlet through a pipeline, the heat exchanger being arranged to exchange heat between the exhaust hot gas introduced from the gas inlet and a working medium, the gas outlet being used for discharging the working medium after being heated by the heat exchange, the exhaust gas outlet being in communication with a ship exhaust pipe through a pipeline, the exhaust gas outlet being used for discharging the exhaust hot gas in the heat exchanger after being cooled by the heat exchange with the working medium, the gas outlet being in communication with the second gas inlet through a pipeline, the turbine being capable of being driven to rotate by the working medium introduced from the second gas inlet after being heated by the heat exchange and driving the transmission shaft to rotate, the second gas outlet being used for discharging the working medium in the second chamber after completing the operation of driving the turbine to rotate;

[0009] A transmission member, the transmission shaft being connected with the propeller shaft through the transmission member, the transmission shaft being capable of driving the propeller shaft to rotate by the transmission member.

[0010] According to an embodiment of the present application, the transmission member comprises a connecting shaft and a transmission assembly, the connecting shaft being coaxially connected with the transmission shaft and being capable of rotating with the transmission shaft, the connecting shaft being connected with the propeller shaft through the transmission assembly, the connecting shaft being capable of driving the propeller shaft to rotate by the transmission assembly.

[0011] According to an embodiment of the present application, the device for converting exhaust energy of a ship diesel engine further comprises at least one support seat, the support seat comprising a support body and a bearing, the transmission shaft and / or the connecting shaft being installed between the support body and the bearing, the support seat being used for supporting the transmission shaft and / or the connecting shaft, the bearing being used for reducing the friction between the transmission shaft and / or the connecting shaft and the support body.

[0012] According to an embodiment of the present application, the transmission shaft is connected with an electric motor generator, the transmission shaft is driven to rotate to a predetermined rotating speed by the electric motor generator being energized, and the turbine rotates with the transmission shaft.

[0013] According to an embodiment of the present application, the exhaust energy conversion device for a marine diesel engine further comprises a clutch installed between the connecting shaft and the transmission shaft, the clutch is controlled to cut off or transmit the power input from the transmission shaft to the connecting shaft, when the transmission shaft remains connected with the electric motor generator being de-energized and the clutch is controlled to cut off the power transmitted from the transmission shaft to the connecting shaft, the transmission shaft is capable of driving the electric motor generator being de-energized to generate electricity, when the transmission shaft is detached from the electric motor generator being de-energized and the clutch is controlled to transmit the power input from the transmission shaft to the connecting shaft, the transmission shaft drives the propeller shaft to rotate through the transmission member, and when the clutch is controlled to transmit the power input from the transmission shaft to the connecting shaft, the transmission shaft is capable of driving the electric motor generator being de-energized to generate electricity and the transmission shaft drives the propeller shaft to rotate through the transmission member.

[0014] According to an embodiment of the present application, the exhaust energy conversion device for a marine diesel engine further comprises a condenser, the condenser has an inlet and an outlet, the inlet is communicated with the second outlet through a pipeline, the condenser is capable of cooling and lowering the temperature of the working medium passing through the inlet, the outlet is used to discharge the working medium cooled and lowered in temperature by the condenser to present a liquid state, and the heat exchanger further has a communicating port, the communicating port is communicated with the outlet through a pipeline, the condenser has an inlet and an outlet, the inlet is communicated with a cooling liquid supply device, and the outlet is used to discharge the cooling liquid heated by the condenser.

[0015] According to an embodiment of the present application, the exhaust energy conversion device for a marine diesel engine further comprises a flow guide pump set, the flow guide pump set comprises a gas pump, the gas pump is installed on the pipeline between the first outlet and the inlet, and the gas pump is capable of guiding the exhaust hot gas completing the push rotation operation of the turbine in the first chamber to the inlet through the first outlet.

[0016] According to an embodiment of the present application, the flow guide pump set comprises a working medium pump, the working medium pump is installed on the pipeline between the outlet and the communicating port, and the working medium pump is capable of guiding the working medium cooled and lowered in temperature by the condenser to present a liquid state to the communicating port through the outlet.

[0017] According to an embodiment of the present application, the flow guide pump set further comprises a liquid delivery pump, which is installed on a pipeline between the liquid inlet and the cooling liquid supply device, and is capable of guiding the cooling liquid from the cooling liquid supply device to the liquid inlet.

[0018] To achieve the above at least one advantage of the present application, the present application provides a working method of a ship diesel engine exhaust energy conversion device, comprising the following steps:

[0019] The internal combustion engine introduces the waste heat gas into the first chamber of the volute through the first air inlet, the turbine is driven to rotate by the waste heat gas and drives the transmission shaft to rotate;

[0020] The waste heat gas that has completed the pushing rotation of the turbine is guided to the guide inlet through the first air outlet, the waste heat gas that has completed the pushing rotation of the turbine and the working medium are exchanged by the heat exchanger, the working medium that is heated by the heat exchange enters the second chamber through the second air inlet, the turbine is driven to rotate by the working medium that is heated by the heat exchange and drives the transmission shaft to rotate, and the waste heat gas that is cooled by the heat exchange is guided out through the exhaust port;

[0021] The transmission shaft drives the paddle shaft to rotate through the transmission member to drive the ship to move forward. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic diagram of the ship diesel engine exhaust energy conversion device is shown.

[0023] Figure 2 The partial structure sectional view of the ship diesel engine exhaust energy conversion device is shown.

[0024] Figure 3 The partial structure perspective view of the ship diesel engine exhaust energy conversion device is shown.

[0025] Figure 4 The scene schematic diagram of the ship diesel engine exhaust energy conversion device is shown.

[0026] Figure 5 Another scene schematic diagram of the ship diesel engine exhaust energy conversion device is shown. DETAILED DESCRIPTION

[0027] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments in the following description are only examples of implementing the present application and other obvious modifications are possible to those skilled in the art. The principles defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0028] Those skilled in the art will understand that, in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0029] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0030] Reference Figure 1 and Figure 3 A device for converting exhaust energy of a marine diesel engine according to a preferred embodiment of the present application will be described in detail below, which is connected with a propeller shaft 100 and a diesel engine 200 having an exhaust outlet 2001, and can convert the energy of the exhaust heat gas discharged from the exhaust outlet 2001 into mechanical energy to drive the propeller shaft 100 to rotate.

[0031] Reference Figures 2-3 The device for converting exhaust energy of a marine diesel engine includes a turbo expander 10, which includes a volute 11, a turbine 12 and a transmission shaft 13 coaxially connected with the turbine 12 and sealingly penetrating through the volute 11. The turbine 12 is installed in the volute 11 and divides the space in the volute 11 into a first chamber 101 and a second chamber 102, and the volute 11 has a first gas inlet 1101 and a first gas outlet 1102 communicating with the first chamber 101, and the first gas inlet 1101 is directed towards the turbine 12.

[0032] The first gas inlet 1101 communicates with the exhaust outlet 2001, and the turbine 12 can be driven to rotate by the exhaust heat gas introduced from the first gas inlet 1101 and drive the transmission shaft 13 to rotate together, in the process, the exhaust heat gas expands and does work in the first chamber 101, to convert part of its energy into mechanical energy. The first gas outlet 1102 is used to discharge the exhaust heat gas in the first chamber 101 that has completed the operation of driving the turbine 12 to rotate.

[0033] ReferenceFigures 2-4 The device for converting the exhaust energy of a marine diesel engine comprises a heat exchanger 20, which has a guide inlet 201, a guide outlet 202 and an exhaust outlet 203. The guide inlet 201 is connected to the first outlet 1102 by a pipeline. The heat exchanger 20 is arranged to exchange heat between the exhaust gas introduced through the guide inlet 201 and a working medium. The guide outlet 202 is used to guide the working medium heated by the heat exchange. The exhaust outlet 203 is connected to a marine exhaust pipe by a pipeline. The exhaust outlet 203 is used to discharge the exhaust gas cooled by the heat exchange in the heat exchanger 20.

[0034] It is worth mentioning that the temperature of the exhaust gas cooled by the heat exchange and discharged through the exhaust outlet 203 is lower than 100°, which effectively reduces the pollution of the exhaust gas to the environment compared with the direct discharge of the exhaust gas of the diesel engine 200.

[0035] Referring to Figure 2 , Figure 3 and Figure 5 , the volute 11 further has a second inlet 1103 and a second outlet 1104 connected to the second chamber 102. The second inlet 1103 is directed towards the turbine 12. The guide outlet 202 is connected to the second inlet 1103 by a pipeline. The turbine 12 can be driven to rotate by the working medium heated by the heat exchange and introduced through the second inlet 1103, and the transmission shaft 13 is driven to rotate together. In this process, the working medium heated by the heat exchange and expanded in the second chamber 102 converts part of its energy into mechanical energy. The second outlet 1104 is used to discharge the working medium in the second chamber 102 after completing the operation of driving the turbine 12 to rotate.

[0036] Referring to Figure 1 and Figure 3 , the device for converting the exhaust energy of a marine diesel engine further comprises a transmission member 30. The transmission shaft 13 is connected to the propeller shaft 100 through the transmission member 30. The transmission shaft 13 can drive the propeller shaft 100 to rotate through the transmission member 30. In this way, the energy of the exhaust gas is converted into mechanical energy multiple times through the cooperation of the turbo expander 10, the heat exchanger 20 and the transmission member 30, which drives the propeller shaft 100 to rotate to propel the ship to move, so that the energy of the exhaust gas is greatly utilized, effectively avoiding the waste of the energy of the exhaust gas, improving the utilization rate of fuel, and greatly saving energy compared with only using fuel to drive, achieving energy saving and emission reduction.

[0037] The transmission member 30 comprises a connecting shaft 31 and a transmission assembly 32, the connecting shaft 31 is coaxially connected with the transmission shaft 13 and can rotate with the transmission shaft 13. The connecting shaft 31 is connected with the paddle shaft 100 through the transmission assembly 32, and the connecting shaft 31 can drive the paddle shaft 100 to rotate through the transmission assembly 32.

[0038] The transmission assembly 32 comprises a primary rotating member 321 and a secondary rotating member 322, the primary rotating member 321 is coaxially installed on the connecting shaft 31, the size of the primary rotating member 321 matches the size of the secondary rotating member 322, the primary rotating member 321 can rotate with the connecting shaft 31 and drive the secondary rotating member 322 to rotate. The secondary rotating member 322 is coaxially installed on the paddle shaft 100, and the connecting shaft 31 can drive the paddle shaft 100 to rotate through the cooperation of the primary rotating member 321 and the secondary rotating member 322.

[0039] Preferably, the primary rotating member 321 and the secondary rotating member 322 are both implemented as gears, and the two gears are engaged with each other, at this time the connecting shaft 31 can drive the paddle shaft 100 to rotate through the engagement of the two gears.

[0040] Alternatively, the transmission assembly 32 is implemented as comprising two rotating discs and a belt, the belt is sleeved on the two rotating discs, any one of the two rotating discs is coaxially connected with the connecting shaft 31, and the other is coaxially connected with the paddle shaft 100. The connecting shaft 31 drives the paddle shaft 100 to rotate through the cooperation of the belt and the two rotating discs.

[0041] Referring to Figure 3 and Figure 5 , the device for converting exhaust energy of a marine diesel engine further comprises a condenser 40, the condenser 40 has an inlet 401 and an outlet 402, the inlet 401 is communicated with the second gas outlet 1104 through a pipeline, the condenser 40 can cool the working medium passing through the inlet 401, and the outlet 402 is used for discharging the working medium cooled by the condenser 40 and showing liquid state. The heat exchanger 20 further has a communication port 204, the communication port 204 is communicated with the outlet 402 through a pipeline, so that the condenser 40 can supply the working medium cooled and showing liquid state to the heat exchanger 20 through the communication port 204, so as to provide a cold source for the heat exchanger 20 to exchange heat with the waste heat gas completing the push rotation of the turbine 12.

[0042] The condenser 40 has an inlet port 403 and an outlet port 404, the inlet port 403 is communicated with a cooling liquid supply device to enable the cooling liquid supply device to supply cooling liquid to the condenser 40. The outlet port 404 is used to discharge the cooling liquid which is heated by the condenser 40.

[0043] Referring to Figure 1 and Figure 3 It is worth mentioning that the transmission shaft 13 is connected with an electric generator 300, the transmission shaft 13 can be driven to rotate to a predetermined rotating speed by the electric generator 300 which is energized, the turbine 12 rotates with the transmission shaft 13, so that the turbine 12 rotating at a predetermined rotating speed can guide the exhaust hot gas to be introduced into the first chamber 101 through the first inlet port 1101, which facilitates the subsequent conversion of the energy of the exhaust hot gas.

[0044] The exhaust energy conversion device for the diesel engine of the ship includes a clutch 50, the clutch 50 is installed between the connecting shaft 31 and the transmission shaft 13, the clutch 50 can be controlled to cut off or transmit the power input by the transmission shaft 13 to the connecting shaft 31.

[0045] When the transmission shaft 13 remains connected with the electric generator 300 which is de-energized, and the clutch 50 is controlled to cut off the power transmitted by the transmission shaft 13 to the connecting shaft 31, the transmission shaft 13 can drive the electric generator 300 which is de-energized to operate to generate electricity. In this way, the ship power does not need to start the auxiliary generator to effectively save energy.

[0046] When the transmission shaft 13 is detached from the electric generator 300 which is de-energized, and the clutch 50 is controlled to transmit the power input by the transmission shaft 13 to the connecting shaft 31, the transmission shaft 13 drives the propeller shaft 100 to rotate by the transmission member 30 to assist the ship to move forward.

[0047] When the clutch 50 is controlled to transmit the power input by the transmission shaft 13 to the connecting shaft 31, the transmission shaft 13 can drive the electric generator 300 which is de-energized to operate, and the transmission shaft 13 drives the propeller shaft 100 to rotate by the transmission member 30, realizing the simultaneous generation of electricity and the movement of the ship.

[0048] In this way, the exhaust energy conversion device for the diesel engine of the ship can be flexibly switched among the three modes of power generation, ship movement and simultaneous power generation and ship movement to meet the actual use scene.

[0049] Referring to Figure 1 and Figure 3The exhaust energy conversion device for marine diesel engine further comprises a flow guide pump set 60, the flow guide pump set 60 comprises a gas pump 61, the gas pump 61 is installed on the pipeline between the first gas outlet 1102 and the guide inlet 201, the gas pump 61 can guide the exhaust gas which has completed the pushing rotation operation of the turbine 12 to pass through the first gas outlet 1102 and guide to the guide inlet 201, so as to facilitate the flow of the exhaust gas which has completed the pushing rotation operation of the turbine 12.

[0050] The flow guide pump set 60 comprises a working medium pump 62, the working medium pump 62 is installed on the pipeline between the guide outlet 402 and the communication port 204, the working medium pump 62 can guide the working medium which has been cooled and presents liquid in the condenser 40 to pass through the guide outlet 402 and guide to the communication port 204, so as to facilitate the flow of the working medium which has been cooled and presents liquid.

[0051] The flow guide pump set 60 further comprises a liquid delivery pump 63, the liquid delivery pump 63 is installed on the pipeline between the liquid inlet 403 and the cooling liquid supply device, the liquid delivery pump 63 can guide the cooling liquid from the cooling liquid supply device to the liquid inlet 403, so as to facilitate the condenser 40 to cool and cool the working medium which has completed the pushing rotation operation of the turbine 12.

[0052] Reference Figure 1 And Figure 3 The exhaust energy conversion device for marine diesel engine further comprises at least one support seat 70, the support seat 70 comprises a support body 71 and a bearing 72, the transmission shaft 13 and / or the connecting shaft 31 is installed between the support body 71 and the bearing 72. The support seat 70 is used to support the transmission shaft 13 and / or the connecting shaft 31, and the bearing 72 is used to reduce the friction between the transmission shaft 13 and / or the connecting shaft 31 and the support body 71.

[0053] The working method of the exhaust energy conversion device for marine diesel engine is proposed, comprising the following steps:

[0054] The internal combustion engine 200 introduces the exhaust gas into the first chamber 101 of the volute 11 through the first gas inlet 1101, and the turbine 12 is driven by the exhaust gas to rotate and drive the transmission shaft 13 to rotate;

[0055] The waste heat gas after completing the push rotation of the turbine 12 is guided to the inlet port 201 through the first outlet port 1102, and the waste heat gas after completing the push rotation of the turbine 12 and the working medium are heat-exchanged by the heat exchanger 20. The working medium after heat-exchange and temperature rise enters the second chamber 102 through the second inlet port 1103, and the turbine 12 is pushed to rotate by the working medium after heat-exchange and temperature rise, and drives the transmission shaft 13 to rotate together. At the same time, the waste heat gas after heat-exchange and temperature drop is discharged through the exhaust port 203.

[0056] The transmission shaft 13 drives the paddle shaft 100 to rotate together through the transmission member 30, so as to push the ship to move forward.

[0057] Preferably, the working method of the exhaust energy conversion device for the diesel engine of the ship further comprises the following steps:

[0058] The working medium after completing the push rotation of the turbine 12 enters the condenser 40 through the inlet port 401 and is cooled and temperature-reduced in the condenser 40. The working medium after cooling and temperature-reduction and showing liquid state is guided to the communication port 204 through the outlet port 402, so as to provide a cold source for the heat exchanger 20 to heat-exchange the waste heat gas after completing the push rotation of the turbine 12.

[0059] Preferably, the working method of the exhaust energy conversion device for the diesel engine of the ship further comprises the following steps:

[0060] The cooling liquid enters the condenser 40 through the liquid inlet port 403, so as to provide a cold source for the condenser 40 to cool and temperature-reduce the working medium after completing the push rotation of the turbine 12. The cooling liquid after heat-exchange and temperature rise in the condenser 40 is discharged through the liquid outlet port 404.

[0061] Preferably, the working method of the exhaust energy conversion device for the diesel engine of the ship further comprises the following steps: the transmission shaft 13 is driven to rotate to reach a predetermined rotating speed by the motor generator 300 after being electrified, and then the turbine 12 rotates synchronously, so that the turbine 12 rotating at a predetermined rotating speed can guide the waste heat gas to enter the first chamber 101 through the first inlet port 1101.

[0062] Preferably, the working method of the exhaust energy conversion device for the diesel engine of the ship further comprises the following steps: the transmission shaft 13 and the motor generator 300 after being de-energized are kept connected, and the clutch 50 is controlled to cut off the power transmission from the transmission shaft 13 to the connecting shaft 31. At this time, the transmission shaft 13 drives the motor generator 300 after being de-energized to operate to generate electricity.

[0063] Preferably, the working method of the device for converting the exhaust energy of a marine diesel engine further comprises the following steps: when the clutch 50 is controlled to transmit the power inputted by the transmission shaft 13 to the connecting shaft 31, the transmission shaft 13 can drive the de-energized motor generator 300 to operate, and the transmission shaft 13 drives the propeller shaft 100 to rotate by the transmission member 30, realizing simultaneous power generation and propelling the ship.

[0064] Preferably, the working method of the device for converting the exhaust energy of a marine diesel engine further comprises the following steps: when the clutch 50 is controlled to transmit the power inputted by the transmission shaft 13 to the connecting shaft 31, the transmission shaft 13 can drive the de-energized motor generator 300 to operate, and the transmission shaft 13 drives the propeller shaft 100 to rotate by the transmission member 30, realizing simultaneous power generation and propelling the ship.

[0065] Those skilled in the art should understand that the above description and the embodiments of the present application shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively achieved. The functions and structural principles of the present application have been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principles.

Claims

1. A device for converting exhaust energy from a marine diesel internal combustion engine, connected to a propeller shaft and an internal combustion engine, the internal combustion engine having an exhaust outlet, characterized in that, The device for converting exhaust energy from marine diesel internal combustion engines includes: a turbine expander, which includes a volute, a turbine, and a drive shaft. The drive shaft is coaxially connected to the turbine and sealably penetrates the volute. The turbine is installed inside the volute and divides the space inside the volute into a first chamber and a second chamber. The volute has a first air inlet and a first air outlet communicating with the first chamber. The first air inlet faces the turbine and is connected to the exhaust gas outlet. The turbine can be driven to rotate by the waste heat gas introduced through the first air inlet and drive the drive shaft to rotate together. The first air outlet is used to discharge the waste heat gas in the first chamber that has completed the operation of driving the turbine. The volute also has a second air inlet and a second air outlet communicating with the second chamber. The second air inlet faces the turbine. A heat exchanger has an inlet, an outlet, and an exhaust outlet. The inlet is connected to a first outlet via a pipeline. The heat exchanger is configured to exchange heat between waste heat gas introduced through the inlet and a working fluid. The outlet is used to discharge the working fluid that has been heated by the heat exchange. The exhaust outlet is connected to a ship exhaust pipe via a pipeline. The exhaust outlet is used to discharge waste heat gas that has been cooled by the working fluid in the heat exchanger. The outlet is connected to a second inlet via a pipeline. The turbine can be driven to rotate by the working fluid that has been heated by the heat exchange introduced through the second inlet, and drive the drive shaft to rotate together. The second outlet is used to discharge the working fluid that has completed the turbine rotation operation in the second chamber. A transmission component, wherein the transmission shaft is connected to the propeller shaft via the transmission component, and the transmission shaft can drive the propeller shaft to rotate via the transmission component; The transmission component includes a connecting shaft and a transmission assembly. The connecting shaft is coaxially connected to the transmission shaft and can rotate together with the transmission shaft. The connecting shaft is connected to the propeller shaft through the transmission assembly, and the connecting shaft can drive the propeller shaft to rotate through the transmission assembly. The drive shaft is connected to an electric generator, and the drive shaft can be driven to rotate by the energized electric generator to reach a predetermined speed. The turbine rotates together with the drive shaft. The device for converting exhaust energy from a marine diesel internal combustion engine includes a clutch installed between the connecting shaft and the drive shaft. The clutch can be controlled to disconnect or transmit power input from the drive shaft to the connecting shaft. When the drive shaft remains connected to the de-energized electric generator and the clutch is controlled to disconnect the power transmitted from the drive shaft to the connecting shaft, the drive shaft can drive the de-energized electric generator to generate electricity. When the drive shaft is disconnected from the de-energized electric generator and the clutch is controlled to transmit power input from the drive shaft to the connecting shaft, the drive shaft drives the propeller shaft to rotate via the transmission member. When the clutch is controlled to transmit power input from the drive shaft to the connecting shaft, the drive shaft can drive the de-energized electric generator to operate, and the drive shaft drives the propeller shaft to rotate via the transmission member. The device for converting exhaust energy from marine diesel internal combustion engines further includes a condenser with an inlet and an outlet. The inlet is connected to the second exhaust port via a pipeline. The condenser can cool the working fluid passing through the inlet. The outlet is used to discharge the working fluid that has been cooled by the condenser and is now in a liquid state. The heat exchanger also has a connecting port connected to the outlet via a pipeline. The condenser has a liquid inlet and a liquid outlet. The liquid inlet is connected to a coolant supply device. The liquid outlet is used to discharge the coolant that has been heated by the heat exchange in the condenser.

2. The device for converting exhaust energy from marine diesel internal combustion engines according to claim 1, characterized in that, The device for converting exhaust energy from marine diesel internal combustion engines further includes at least one support base, which includes a support body and a bearing. The drive shaft and / or the connecting shaft is installed between the support body and the bearing. The support base is used to support the drive shaft and / or the connecting shaft, and the bearing is used to reduce the friction between the drive shaft and / or the connecting shaft and the support body.

3. The device for converting exhaust energy from marine diesel internal combustion engines according to claim 1 or 2, characterized in that, The device for converting exhaust energy from marine diesel internal combustion engines further includes a flow guide pump assembly, which includes a gas pump installed on the pipeline between the first outlet and the inlet. The gas pump can guide the waste heat gas that completes the turbine operation in the first chamber through the first outlet to the inlet.

4. The device for converting exhaust energy from marine diesel internal combustion engines according to claim 3, characterized in that, The flow pump assembly includes a working fluid pump, which is installed on the pipeline between the outlet and the connection port. The working fluid pump can guide the working fluid, which is cooled and becomes liquid in the condenser, through the outlet to the connection port.

5. The device for converting exhaust energy from marine diesel internal combustion engines according to claim 3, characterized in that, The diversion pump assembly also includes a delivery pump, which is installed on the pipeline between the inlet and the coolant supply device. The delivery pump can guide the coolant from the coolant supply device to the inlet.

6. A method for operating the equipment for converting exhaust energy from marine diesel internal combustion engines according to any one of claims 1-5, characterized in that, Includes the following steps: The internal combustion engine introduces waste heat gas into the first chamber of the volute through the first air intake. The turbine is driven to rotate by the waste heat gas and drives the drive shaft to rotate together. The waste heat gas that has completed the rotation of the turbine is guided to the inlet through the first outlet. The heat exchanger exchanges heat between the waste heat gas that has completed the rotation of the turbine and the working fluid. The working fluid that has been heated by the heat exchange enters the second chamber through the second inlet. The turbine is driven to rotate by the heated working fluid and drives the drive shaft to rotate together. At the same time, the waste heat gas that has been cooled by the heat exchange is discharged through the exhaust outlet. The drive shaft drives the propeller shaft to rotate together with the drive components, thereby propelling the ship forward.

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