Marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery

Abstract

The invention provides a marine diesel engine thermo-acoustic power generation system driven by low-melting-point metal waste heat recovery, which comprises a low-melting-point metal heat exchanger, a low-melting-point metal heat exchanger, a low-melting-point metal heat exchanger, a low-melting-point metal heat exchanger, a low-melting-point metal heat exchanger, a low-melting-point metal heat exchanger and a low-melting-point metal heat exchanger, a heat storage cabin; the heat exchange coil pipe is arranged in the heat storage cabin; the thermo-acoustic engine is connected with the heat exchange coil pipe through a pipeline; and the linear generator is connected with the thermo-acoustic generator. The low-melting-point metal serves as a heat transfer medium, has the characteristics of wide working temperature range, high heat transfer capacity, high temperature resistance and the like, and provides powerful conditions for fully recycling waste heat of a diesel engine and improving the heat efficiency of a thermo-acoustic power generation system. The thermoacoustic power generation system improves the comprehensive energy efficiency of the marine diesel engine, fully utilizes the waste heat of the diesel engine, and is beneficial to solving the technical problem that a system for improving the efficiency of the power generation system by utilizing the waste heat of the diesel engine is lacked in the prior art.

Description

Technical fields:

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a marine diesel engine thermoacoustic power generation system driven by the recovery of low-melting-point metal waste heat. Background technology:

[0002] With increasing global concern about climate change, the shipping industry, as a vital carrier of international trade, has seen its greenhouse gas emissions become a focal point of international attention. The IMO has set medium-term targets to reduce shipping carbon intensity by 40% by 2030 and total carbon emissions by 50% by 2050. Beyond the IMO's global efforts, some regions have also taken action. For example, the European Union decided to include the shipping industry in its Emissions Trading System (EU ETS) starting in 2024. The shipping industry is undergoing a green transition driven by both international and regional regulations, aimed at reducing greenhouse gas emissions and protecting the environment. These measures not only require industry participants to adhere to stringent technical and operational standards but also encourage the application of innovative technologies to achieve long-term emission reduction targets.

[0003] Marine diesel engines suffer from waste heat losses as high as 30%-50%, and their exhaust gases are mostly low-quality heat sources, making them difficult to utilize effectively. Thermoacoustic power generation systems can fully utilize low-quality heat sources, converting heat into sound through the thermoacoustic effect, and then converting sound into electricity through a linear generator.

[0004] There is an urgent need for a thermoacoustic power generation system for marine diesel engines driven by the recovery of low-melting-point metal waste heat, which would help solve the technical problem of the lack of a system that utilizes diesel engine waste heat to improve the efficiency of power generation systems. Summary of the Invention:

[0005] In one embodiment, the present invention provides a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery. The low-melting-point metal, as a heat transfer medium, possesses characteristics such as a wide operating temperature range, strong heat transfer capacity, and high-temperature resistance, providing favorable conditions for fully recovering diesel engine waste heat and improving the thermal efficiency of the thermoacoustic power generation system. This thermoacoustic power generation system will improve the overall energy efficiency of marine diesel engines, fully utilize diesel engine waste heat, and help solve the technical problem of the lack of a system in the prior art that utilizes diesel engine waste heat to improve the efficiency of power generation systems.

[0006] The low-melting-point metal waste heat recovery-driven marine diesel engine thermoacoustic power generation system includes:

[0007] A low-melting-point metal heat exchanger that exchanges heat with the diesel engine exhaust gas;

[0008] One thermal storage compartment;

[0009] A heat exchange coil is installed inside the heat storage chamber;

[0010] A thermoacoustic engine is connected to the heat exchange coil via a pipeline;

[0011] A linear generator is connected to the thermoacoustic generator.

[0012] In one embodiment, one end of the heat exchange coil is connected to the low melting point metal heat exchanger via a first pipeline, and the other end of the heat exchange coil is connected to the thermoacoustic engine via a second pipeline.

[0013] In one embodiment, a connecting pipe section is provided between one end of the heat exchange coil and the other end of the heat exchange coil;

[0014] A first valve and a second valve are provided at one end of the heat exchange coil and the other end of the heat exchange coil, and a third valve is connected in series on the pipeline section.

[0015] In one embodiment, the marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery includes a degassing device;

[0016] One end of the degassing device is connected to the thermoacoustic engine;

[0017] The other end of the degassing device is connected to one end of the pipeline of the low melting point metal heat exchanger, and a circulating pump is connected in series.

[0018] The other end of the pipe of the low melting point metal heat exchanger is connected to one end of the heat exchange coil.

[0019] In one embodiment, there are multiple thermoacoustic engines, and the temperature is controlled by a temperature control valve.

[0020] In one embodiment, the low-melting-point metal waste heat recovery-driven marine diesel engine thermoacoustic power generation system includes an intelligent control system;

[0021] In one embodiment, the intelligent control system controls the first valve and the second valve, as well as the circulating pump, the temperature control valve, and the heat storage chamber.

[0022] In one embodiment, the thermal storage chamber is an externally insulated storage chamber.

[0023] In one embodiment, there are multiple linear generators.

[0024] In one embodiment, a connecting cavity is provided between the thermoacoustic engines for connecting the linear generator.

[0025] In one embodiment, the intelligent control system, through real-time assessment of the system's thermal demand and real-time monitoring of the physical properties of various locations within the system, rationally controls each valve and device to ensure the safe operation of the system. Attached image description:

[0026] Figure 1 This is a schematic diagram of a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery in one embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the working logic of a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery in another embodiment of the present invention.

[0028] Figure label:

[0029] 1. Low melting point metal heat exchanger;

[0030] 2. Thermal storage compartment;

[0031] 3. Heat exchange coils;

[0032] 4. Degassing device;

[0033] 5. Circulating pump;

[0034] 6. Thermoacoustic engine;

[0035] 7. Linear generator;

[0036] 8. Intelligent control system;

[0037] 9 First Valve

[0038] 11 Second valve

[0039] 10 Third Valve

[0040] 12 Temperature control valve Specific implementation examples:

[0041] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Various embodiments and features of this application are described herein with reference to the accompanying drawings.

[0043] These and other features of this application will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0044] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this application, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0045] The above and other aspects, features and advantages of this application will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0046] Specific embodiments of this application are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this application, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to ascertain the true intent based on the user's historical operations, and to avoid unnecessary or redundant details that would obscure this application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use this application in various ways with substantially any suitable detailed structure.

[0047] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to this application.

[0048] When arranging these types of supports, the supports on the upper and lower floors will be misaligned, so it is necessary to design a special support connection method to ensure that the load can be transferred through the supports.

[0049] Low-melting-point metals, as heat transfer media, possess characteristics such as a wide operating temperature range, strong heat transfer capacity, and high-temperature resistance, providing favorable conditions for fully recovering waste heat from diesel engines and improving the thermal efficiency of thermoacoustic power generation systems. This thermoacoustic power generation system will enhance the overall energy efficiency of marine diesel engines and make full use of their waste heat.

[0050] Figure 1 This is a schematic diagram of a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery in one embodiment of the present invention.

[0051] In one embodiment, such as Figure 1 As shown, this invention provides a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery. The system comprises:

[0052] A low-melting-point metal heat exchanger 1, which exchanges heat with the diesel engine exhaust gas;

[0053] One thermal storage compartment 2;

[0054] A heat exchange coil 3 is installed inside the heat storage chamber 2;

[0055] A thermoacoustic engine 6 is connected to a heat exchange coil 3 via a pipeline;

[0056] A linear generator 7 is connected to the thermoacoustic generator 6.

[0057] This embodiment provides a basic implementation of a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery.

[0058] Furthermore, we can also conclude that thermoacoustic power generation technology, with its high reliability, lack of moving parts (in the core conversion stage), and ability to utilize low-grade heat sources, is very suitable for waste heat recovery from ships.

[0060] I. Description of the principle of thermal cycling

[0061] The core energy flow and conversion path of this system follows the following thermodynamic cycle:

[0062] 1. Waste heat capture and storage stage:

[0063] The high-temperature exhaust gas (usually 300-450℃) from the marine diesel engine flows through a low-melting-point metal heat exchanger (1).

[0064] The low-melting-point metal (such as eutectic alloy: 58% Ga, 42% In, melting point about 15.7℃; or tin-bismuth alloy, etc.) filled in the heat exchanger absorbs heat from the exhaust gas, raising the temperature and maintaining a liquid state.

[0065] High-temperature liquid metal flows into the heat storage chamber (2) under the influence of gravity or a pump. The heat storage chamber itself is also filled with a large amount of low-melting-point metal, and its huge heat capacity plays a role in "smoothing" the load fluctuations of the diesel engine and stabilizing the heat supply.

[0066] High-temperature liquid metal flows through the heat exchange coil (3) and transfers heat to the working fluid (usually a high-pressure inert gas, such as helium) inside the coil.

[0067] Thermoacoustic conversion phase (core loop):

[0068] The heat exchange coil (3) serves as the high-temperature heat exchanger (HHX) of the thermoacoustic engine (6).

[0069] The heated working gas experiences a rapid temperature increase and volume expansion, propelling gas molecules towards the regenerator of the thermoacoustic engine. The regenerator, typically constructed of a porous medium with a high specific surface area (such as stainless steel wire mesh), is the core of the thermoacoustic effect.

[0070] As the working gas flows through the regenerator, it undergoes extremely complex thermal interactions (thermoacoustic effects) with the solid medium. Under specific phase conditions (determined by the engine's geometry, the working gas, and the temperature difference), the macroscopic oscillatory kinetic energy (sound work) of the gas molecules is continuously amplified, forming a powerful standing wave or traveling wave sound field. This process can be understood as directly converting thermal energy into sound wave (mechanical vibration) energy.

[0071] After releasing heat, the working gas, now "cooled," moves to the room-temperature end heat exchanger (CHX) and is cooled by a cooling medium (such as seawater provided by a ship's central cooling water system), completing a thermodynamic cycle and preparing for the next heating and oscillation.

[0072] Power generation stage:

[0073] The high-intensity sound waves (pressure oscillations) generated inside the thermoacoustic engine drive the piston (or mover) of a linear generator (7) at the end of an acoustic resonant tube to reciprocate.

[0074] In a linear generator, the moving part and the stator coil move relative to each other, cutting magnetic field lines. According to the law of electromagnetic induction, mechanical energy (sound power) is directly converted into electrical energy output.

[0075] The entire energy conversion path is as follows: diesel engine exhaust heat energy → low melting point metal internal energy → working gas internal energy / pressure energy → sound power (mechanical energy) → electrical energy.

[0076] Thermoacoustic power generation system for marine diesel engines driven by low-melting-point metal waste heat recovery

[0077] In one embodiment, one end of the heat exchange coil 3 is connected to the low melting point metal heat exchanger 1 through a first pipeline, and the other end of the heat exchange coil 3 is connected to the thermoacoustic engine 6 through a second pipeline.

[0078] In one embodiment, a connecting pipe section is provided between one end of the heat exchange coil 3 and the other end of the heat exchange coil 3;

[0079] A first valve 9 and a second valve 11 are installed at one end of the heat exchange coil 3 and the other end of the heat exchange coil 3, and a third valve 10 is connected in series on the pipeline section.

[0080] In one embodiment, the marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery includes a degassing device;

[0081] One end of the degassing device 8 is connected to the sonic engine 6;

[0082] The other end of the degassing device 8 is connected to one end of the pipeline of the low melting point metal heat exchanger 1, and a circulating pump 5 is connected in series.

[0083] The other end of the pipe of the low melting point metal heat exchanger 1 is connected to one end of the heat exchange coil 3.

[0084] In one embodiment, there are multiple thermoacoustic engines 6, and the temperature is controlled by a temperature control valve 12.

[0085] In one embodiment, the marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery includes an intelligent control system 8;

[0086] The intelligent control system 8 controls the first valve 9 and the second valve 11, as well as the circulating pump 5, the temperature control valve 12, and the heat storage chamber 2.

[0087] In one embodiment, the thermal storage chamber 2 is a storage chamber with external thermal insulation.

[0088] In one embodiment, there are multiple linear generators 7.

[0089] In one embodiment, a connecting cavity is provided between the thermoacoustic engines 6 for connecting the linear generator 7.

[0090] In one embodiment, the intelligent control system 8, through real-time assessment of the system's thermal demand and real-time monitoring of the physical property parameters at various locations of the system, rationally controls each valve and device to ensure the safe operation of the system.

[0091] Figure 2 This is a schematic diagram illustrating the working logic of a marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery, according to another embodiment of the present invention. Figure 2 As shown, supplementary information on subsystems and key components:

[0092] Low-melting-point metal recycling subsystem:

[0093] Metal Circulation Pump (MCP): A mechanical or electromagnetic pump that is resistant to high temperatures and metal corrosion, used to drive the flow of liquid metal when the diesel engine load is low and the natural circulation power is insufficient.

[0094] Expansion tank / buffer tank: Used to accommodate the volume changes of liquid metal due to thermal expansion and contraction, and to maintain stable system pressure.

[0095] Thermal insulation and heat tracing system: All pipelines and storage tanks are thermally insulated, and electric heat tracing is used before system startup or in low-temperature environments to ensure that low-melting-point metals do not solidify.

[0096] Thermoacoustic engine working fluid circuit:

[0097] Inflation and pressure regulation system: used for initial filling with high-pressure working fluid (such as helium) and monitoring and maintaining system pressure during operation.

[0098] Cooling loop of room temperature heat exchanger (CHX): It is necessary to clarify its connection with the ship's existing central cooling water system, including water pumps, valves and temperature control units.

[0099] Power Output and Management System:

[0100] Power electronic converter (inverter / controller): The AC power generated by the linear generator may be of non-standard frequency / voltage, which needs to be converted from AC to AC or AC to DC to AC to stabilize it before being connected to the ship's power grid or used to power the batteries.

[0101] Grid connection synchronization and protection device: ensures that the generated power is synchronized with the main power grid and has protection functions such as overvoltage, overcurrent, and short circuit.

[0102] 2. Supplement to system control and optimization:

[0103] Intelligent control system: This is the "brain" of the system. It should include:

[0104] Temperature sensor array: monitors multiple temperatures including exhaust gas inlet / outlet, liquid metal, HHX, CHX, etc.

[0105] Pressure sensor: monitors the pressure in the thermoacoustic circuit.

[0106] Flow meter: monitors the flow rate of liquid metal and cooling water.

[0107] The control unit (PLC) adjusts the speed of the liquid metal pump and the flow rate of the cooling water in real time based on parameters such as the diesel engine operating conditions (load) and the temperature of the thermal storage tank. It can even "tune" the thermoacoustic engine by adjusting the load of the linear generator to ensure that it always operates at the optimal resonant frequency point and maximizes efficiency.

[0108] 3. Enhanced safety and reliability:

[0109] Redundancy design: Critical components such as circulating pumps and cooling water pumps can be designed with one pump in use and one on standby.

[0110] Safety relief device: Safety valves are installed in the thermoacoustic circuit and the liquid metal circuit to prevent overpressure.

[0111] Leak monitoring and handling: Leak sensors and collection trays are necessary, especially for low-melting-point metals. Although their vapor pressure is extremely low and they are non-toxic, preventing blockage after solidification is still essential.

[0112] Fire prevention measures: Although the thermoacoustic system itself does not ignite, the entire exhaust gas pipeline is still a high-temperature system, so the original fire prevention and noise reduction measures of the exhaust gas boiler must be retained.

[0113] 4. Further considerations for performance improvement:

[0114] Cascaded utilization: The waste heat from the thermoacoustic engine (from CHX) is still at a relatively high temperature (usually 60-100℃), which can be further used to preheat fuel, provide cabin heating, or drive adsorption refrigeration, forming a comprehensive energy recovery system and significantly improving the overall waste heat utilization rate.

[0115] Multi-heat source integration: This system can not only recover heat from diesel engine exhaust gas, but also recover other waste heat sources on ships such as main engine cylinder liner water and turbocharged air through parallel heat exchangers, forming a centralized waste heat recovery and power generation center.

[0116] The technical problem that an invention aims to solve

[0117] As the performance of marine diesel engines continues to improve, the thermal energy contained in their exhaust gases is decreasing, and the low quality of this thermal energy makes it increasingly difficult to utilize directly. Thermoacoustic engines can generate sound waves at relatively low temperatures, and the mechanical energy of these sound waves can be absorbed by a linear generator and converted into electrical energy. This can further improve the utilization rate of the power system.

[0118] Low-melting-point metals, as heating media, possess extremely high heat transfer capabilities, enabling the full recovery of heat from diesel engine exhaust gases. This solves the problems of low-quality and unstable heat recovery from diesel engine exhaust gases. Conventional marine steam heating systems are typically designed for a temperature of around 170°C, while low-melting-point metal heating systems have a wider operating temperature range, reaching up to 500°C. This provides favorable conditions for improving the thermal efficiency of thermoacoustic engines.

[0119] Due to changes in navigation arrangements and sea conditions in the route area, the diesel engine load fluctuates, causing fluctuations in waste heat and ultimately leading to unstable operation of the thermoacoustic engine. To ensure that the thermoacoustic engine operates stably within its high-efficiency range for extended periods, the system is equipped with a heat storage chamber and its intelligent thermal management system to address the issue of heat load fluctuations. When the diesel engine is operating at high load, excess heat is stored in the heat storage chamber; conversely, when the diesel engine load is low, the heat storage chamber replenishes heat to the thermoacoustic engine.

[0120] Specific technical solutions of inventions

[0121] The system is equipped with a low-melting-point metal heat exchanger, a system circulation pump, a heat storage chamber, a thermoacoustic engine, a linear generator, and an intelligent control system.

[0122] The low-melting-point metal heat exchanger extracts heat from the exhaust gas of a marine diesel engine to heat a low-melting-point metal medium. In the exhaust gas economizer, the fluid and diesel engine exhaust gas form a counter-current heat exchange, improving heat exchange efficiency and increasing the fluid outlet temperature. The low-melting-point metal heat exchanger is equipped with electric heat tracing, controlled by an intelligent control system, ensuring that the fluid temperature inside the equipment does not fall below the operating temperature of the low-melting-point metal.

[0123] The heated low-melting-point metal can be used to heat the thermal storage chamber through heat exchange coils, or it can be fed into a thermoacoustic generator to generate electricity.

[0124] The thermal storage chamber is an externally insulated storage compartment. It stores the thermal storage medium, and its bottom is equipped with low-melting-point metal heat exchange coils. The thermal storage medium absorbs and releases heat through these coils.

[0125] A thermoacoustic generator consists of four or more thermoacoustic engines connected in series, with connecting cavities between the engines to connect linear generators. The linear generator absorbs the mechanical energy in the sound waves and converts it into electrical energy.

[0126] Intelligent control system: By real-time assessment of the system's thermal demand and real-time monitoring of the physical properties of each location in the system, the system can rationally control each valve and equipment to ensure safe operation.

[0127] Beneficial effects

[0128] This invention utilizes the heat from the exhaust gases of marine diesel engines to generate electricity. The generated electricity is fed into the ship's electrical grid, reducing the load on the main power station and thus improving overall fuel efficiency and reducing carbon emissions.

[0129] The heat storage chamber can stabilize the heat flow of the thermoacoustic engine, allowing the thermoacoustic generator to remain stable in the high-efficiency range for a long time.

[0130] The intelligent control system achieves heat load matching and fully recovers and utilizes system heat by intelligently switching between different modes, thereby saving energy and ensuring system safety.

[0131] After the marine diesel engine starts, the intelligent control system 8 controls the circulation pump 6 to open, valve 2 to close, and valves 1 and 3 to open. At this time, all the high-temperature heat flow from the low-melting-point metal heat exchanger 1 is used to heat the thermal storage tank 2, causing it to heat up.

[0132] As the load on the marine diesel engine gradually increases, the temperature of the low-melting-point metal heating system gradually reaches the high-efficiency operating range of the thermoacoustic engine 6. At this time, valve 2 opens and valves 1 and 3 close. The temperature control valve 12 opens the inlet valve of the thermoacoustic engine 6, causing the thermoacoustic engine to start working.

[0133] When the ship's diesel engine is running at high load, the opening of valves 1 and 2 is adjusted by the intelligent control system 8, thereby controlling the flow of hot fluid into the thermoacoustic generator for power generation. The remaining fluid enters the heat storage tank 2 for heat storage. At this time, valves 1, 2 and 3 are open.

[0134] When the load on the ship's diesel engine decreases, the fluid from the low-melting-point metal heat exchanger 1 cannot meet the power generation requirements of the thermoacoustic engine. In this case, the intelligent control system 8 closes valve 2 and opens valves 1 and 3. The fluid is heated by the heat storage tank 1 and then enters the thermoacoustic engine to generate electricity.

[0135] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A low-melting-point metal waste heat recovery driven marine diesel engine thermo-acoustic power generation system, characterized in that, The low-melting-point metal waste heat recovery-driven marine diesel engine thermoacoustic power generation system includes: A low-melting-point metal heat exchanger (1) is used to exchange heat with the diesel engine exhaust gas; One thermal storage compartment (2); A heat exchange coil (3) is installed inside the heat storage chamber (2); A thermoacoustic engine (6) is connected to the heat exchange coil (3) via a pipeline; A linear generator (7) is connected to the thermoacoustic generator (6).

2. The marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery according to claim 1, characterized in that, One end of the heat exchange coil (3) is connected to the low melting point metal heat exchanger (1) through a first pipeline, and the other end of the heat exchange coil (3) is connected to the thermoacoustic engine (6) through a second pipeline.

3. The low melting point metal waste heat recovery driven marine diesel engine thermo-acoustic power generation system of claim 2, wherein, A connecting pipe section is provided between one end of the heat exchange coil (3) and the other end of the heat exchange coil (3); A first valve (9) and a second valve (11) are provided at one end of the heat exchange coil (3) and the other end of the heat exchange coil, and a third valve (10) is connected in series on the pipeline section.

4. The low melting point metal waste heat recovery driven marine diesel engine thermo-acoustic power generation system of claim 3, wherein, The marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery includes a degassing device. One end of the degassing device (8) is connected to the thermoacoustic engine (6); The other end of the degassing device is connected to one end of the pipeline of the low melting point metal heat exchanger (1), and a circulating pump (5) is connected in series. The other end of the pipeline of the low melting point metal heat exchanger (1) is connected to one end of the heat exchange coil (3).

5. The low melting point metal waste heat recovery driven ship diesel engine thermo-acoustic power generation system of claim 4, wherein, The thermoacoustic engine (6) is multiple, and its temperature is controlled by a temperature control valve (12).

6. The low melting point metal waste heat recovery driven ship diesel engine thermo-acoustic power generation system of claim 5, wherein, The low-melting-point metal waste heat recovery-driven marine diesel engine thermoacoustic power generation system includes an intelligent control system (8); The intelligent control system (8) controls the first valve (9) and the second valve (11), as well as the circulating pump (5), the temperature control valve (12), and the heat storage chamber (2).

7. The low-melting metal waste heat recovery driven ship diesel engine thermo-acoustic power generation system of claim 6, wherein, The thermal storage chamber (2) is an externally insulated storage chamber.

8. The marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery according to claim 7, characterized in that, The linear generator (7) consists of multiple units.

9. The marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery according to claim 8, characterized in that, A connecting cavity is provided between the thermoacoustic engines (6) for connecting the linear generator (7).

10. The marine diesel engine thermoacoustic power generation system driven by low-melting-point metal waste heat recovery according to claim 9, characterized in that, The intelligent control system (8) ensures the safe operation of the system by real-time assessment of the system's thermal demand and real-time monitoring of the physical properties of each location in the system, and by rationally controlling each valve and equipment.

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