A waste heat recovery and silencing device and system for ship exhaust gas

Abstract

This invention discloses a waste heat recovery and silencing device and system for ship exhaust gas, relating to the field of ship power energy conservation and noise control technology. It includes a connected front guide cone and a muffler housing. The muffler housing has an end interface connected to a front expansion chamber, which in turn connects to a rear silencing chamber. The rear silencing chamber is connected to a waste heat guiding chamber. A first guide plate and a second guide plate are installed within the front expansion chamber. A sound-absorbing kit is installed within the rear silencing chamber. A spiral guide vane is installed within the waste heat guiding chamber. This invention, employing the aforementioned waste heat recovery and silencing device and system for ship exhaust gas, effectively reduces exhaust gas noise while maximizing the retention of waste heat, providing a stable high-temperature airflow source for subsequent recovery processes. Through a two-stage utilization mode of thermoelectric conversion and heat exchange energy storage, waste gas energy can be fully recovered, significantly reducing ship fuel consumption.

Description

Technical Field

[0001] This invention relates to the field of marine power energy conservation and noise control technology, and in particular to a marine exhaust waste heat recovery and silencing device and system. Background Technology

[0002] When the ship's main engine and generator are running, they will generate a large amount of high-temperature exhaust gas (temperature can reach 350-550℃). If the waste heat contained in the exhaust gas is directly discharged, it will cause energy waste, while the medium and high frequency noise (90-100dB) that accompanies the exhaust gas will seriously pollute the engine room and the surrounding environment.

[0003] In existing technologies, silencing devices and waste heat recovery equipment are mostly designed independently: although silencing devices can reduce noise, they often suffer from excessive pressure loss and serious waste heat loss, resulting in low efficiency of subsequent waste heat recovery; while waste heat recovery systems lack targeted airflow guidance structures, and turbulent flow of exhaust gas further aggravates energy loss and equipment wear.

[0004] Therefore, there is an urgent need for an integrated device that combines efficient noise reduction, low-loss heat preservation, and airflow optimization to meet the dual requirements of energy recovery and noise control of ship exhaust. Summary of the Invention

[0005] The purpose of this invention is to provide a ship exhaust waste heat recovery and silencing device and system to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a ship exhaust heat recovery silencing device, comprising a front guide cone and a silencer housing connected together, wherein an end interface is provided inside the silencer housing, the end interface is connected to a front expansion chamber, the front expansion chamber is connected to a rear silencing chamber, and the rear silencing chamber is connected to a waste heat guide chamber;

[0007] The pre-expansion chamber is provided with a first guide plate and a second guide plate;

[0008] The rear silencing cavity is equipped with a sound-absorbing kit;

[0009] The waste heat guiding cavity is equipped with a spiral guide vane.

[0010] Preferably, both the first guide plate and the second guide plate are provided with perforations, and the perforations are arranged in multiple rings, with each ring of perforations arranged in an equilateral triangle.

[0011] Both the first guide plate and the second guide plate are fixed to the inner wall of the expansion chamber by fixing blocks.

[0012] Preferably, the sound-absorbing kit includes an outer protective panel that is attached to the inner wall of the rear sound-absorbing cavity, an inner protective panel that is disposed on the inner side of the outer protective panel, and a sound-absorbing layer that is disposed between the inner protective panel and the outer protective panel.

[0013] The outer protective panel has a through hole.

[0014] A ship exhaust heat recovery system includes a ship exhaust heat recovery silencer and a mounting base. An exhaust gas inlet pipe is installed on the mounting base and connected to the inlet end of the ship exhaust heat recovery silencer. The outlet end of the ship exhaust heat recovery silencer is connected to the high-temperature side of a thermoelectric converter via a first pipe. The low-temperature side of the thermoelectric converter is connected to a heat exchanger via a second pipe. The heat exchanger is connected to a solid heat storage medium via a third pipe. The solid heat storage medium is connected to the inlet end of a filter via a fourth pipe. The outlet end of the filter is connected to an exhaust gas discharge pipe.

[0015] Preferably, valve one is installed on the exhaust gas discharge pipeline, and valve two is installed on the pipeline four.

[0016] Preferably, the filtration device includes a filter box, in which a first filter screen and a second filter screen are sequentially arranged. The second filter screen and the first filter screen are respectively arranged in one end of two mounting frames. An elastic plate is also provided at the other end of the mounting frame. The bottom end of the elastic plate is fixedly connected to the bottom of the mounting frame, and the top end of the elastic plate is in contact with the mounting frame.

[0017] The top of the mounting frame is provided with a sliding push unit, which is connected to a reciprocating unit. The reciprocating unit is connected to a drive unit, which is located at the top of the filter box.

[0018] Preferably, the drive unit includes a drive housing disposed at the top of the filter box, a motor is fixedly disposed on the outside of the drive housing, a fixing plate is disposed at the top inside the drive housing, a through hole is provided on the fixing plate, the output end of the motor passes through the through hole and is fixedly connected to one end of a rotating rod, the other end of the rotating rod is rotatably connected to one end of a push rod, the other end of the push rod is hinged to a support, and a connecting rod is disposed below the support.

[0019] Preferably, the reciprocating unit includes a reciprocating sleeve sleeved outside the connecting rod, a retaining ring fixedly disposed on the reciprocating sleeve, an elastic element one disposed above the retaining ring, one end of the elastic element one being fixedly connected to the retaining ring, and the other end of the elastic element one being fixedly connected to an upper annular protrusion on the inner wall of the drive housing.

[0020] Below the retaining ring, there is an elastic element two. One end of the elastic element two is fixedly connected to the retaining ring, and the other end of the elastic element two is fixedly connected to the lower ring protrusion on the inner wall of the drive housing.

[0021] Preferably, the reciprocating sleeve has an internal cavity, and a sliding plate is provided in the cavity. The upper end of the sliding plate is fixedly connected to the bottom end of the connecting rod. An elastic element three is sleeved on the outside of the connecting rod. One end of the elastic element three is fixedly connected to the upper inner wall of the cavity, and the other end of the elastic element three is fixedly connected to the upper end of the sliding plate.

[0022] An elastic element four is provided below the sliding plate. One end of the elastic element four is fixedly connected to the lower end of the sliding plate, and the other end of the elastic element four is fixedly connected to the lower inner wall of the cavity.

[0023] Preferably, the sliding push unit includes a sliding sleeve fixedly disposed at the top of the mounting frame, and a sliding rod is slidably connected inside the sliding sleeve. The bottom end of the sliding rod passes through the mounting frame and is fixedly connected to the top end of the elastic plate.

[0024] Therefore, the present invention adopts the above-mentioned ship exhaust gas waste heat recovery silencing device and system. Through the combination structure of the front expansion chamber and the rear silencing chamber and the heat preservation design, it can effectively reduce exhaust gas noise and retain exhaust gas waste heat to the maximum extent, providing a stable high-temperature airflow source for subsequent recovery stages. Through the two-stage utilization mode of thermoelectric conversion and heat exchange energy storage, exhaust gas energy can be fully recovered, significantly reducing ship fuel consumption.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the waste heat recovery system of a ship exhaust gas waste heat recovery silencing device and system embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the silencer device of the ship exhaust waste heat recovery silencer device and system of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the first guide plate of the ship exhaust gas waste heat recovery silencing device and system of the present invention;

[0029] Figure 4 This is a cross-sectional schematic diagram of the muffler housing of a ship exhaust waste heat recovery silencing device and system according to the present invention;

[0030] Figure 5 This is a schematic diagram of the filter box structure of a ship exhaust gas waste heat recovery silencing device and system according to the present invention. Figure 1;

[0031] Figure 6 This is a schematic diagram of the filter box structure of a ship exhaust gas waste heat recovery silencing device and system according to the present invention. Figure 2 ;

[0032] Figure 7 This is a schematic diagram of the structure of the elastic plate component of the ship exhaust waste heat recovery silencing device and system of the present invention;

[0033] Figure 8 This is a schematic diagram of the drive unit of a ship exhaust gas waste heat recovery silencing device and system according to the present invention;

[0034] Figure 9 This is a schematic diagram of the reciprocating unit of a ship exhaust waste heat recovery silencing device and system according to the present invention;

[0035] Figure 10 This is a schematic diagram of the sliding thruster unit of a ship exhaust waste heat recovery silencing device and system according to the present invention;

[0036] Reference numerals: 1. Mounting base; 2. Exhaust gas inlet pipe; 21. Valve 1; 3. Ship exhaust gas waste heat recovery silencer; 31. Front guide cone; 32. Silencer housing; 321. Outer layer; 322. Middle layer; 323. Inner layer; 33. End interface; 34. Front expansion chamber; 341. First guide plate; 342. Second guide plate; 343. Fixing block; 344. Perforation; 35. Rear silencer chamber; 351. Outer protective panel; 352. Sound-absorbing layer; 353. Inner protective panel; 36. Waste heat guiding chamber; 361. Spiral guide vane; 4. Thermoelectric converter; 5. Heat exchanger; 6. Solid heat storage body; 7. Filter Device; 70. Filter box; 71. First filter screen; 72. Second filter screen; 73. Elastic plate; 741. Drive housing; 742. Motor; 743. Fixed plate; 744. Rotating rod; 745. Push rod; 746. Support; 747. Connecting rod; 751. Reciprocating sleeve; 752. Snap ring; 753. Elastic component one; 754. Elastic component two; 755. Sliding plate; 756. Elastic component three; 757. Elastic component four; 761. Sliding sleeve; 762. Sliding rod; 77. Cleaning door; 81. Pipeline one; 82. Pipeline two; 83. Pipeline three; 84. Pipeline four; 841. Valve two; 9. Exhaust gas discharge pipeline. Detailed Implementation

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Example

[0040] Please see Figures 1-10 This invention provides a waste heat recovery and silencing device for ship exhaust gas, comprising a front guide cone 31 and a silencer housing 32 connected to each other. The silencer housing 32 has a three-layer structure: an outer layer 321, a middle layer 322, and an inner layer 323. The inner layer 323 is made of stainless steel, the middle layer 322 is made of aluminosilicate cotton, and the outer layer 321 is made of cold-rolled steel plate. The front guide cone 31 adopts a convergent-expanding structure and is connected to the exhaust gas inlet pipe 2 and the end interface 33 via flanges. Through its streamlined design, it smoothly guides the high-speed concentrated exhaust gas to the front expansion chamber 34, avoiding vortex noise generated by airflow impact and reducing pressure loss. The silencer housing 32 has an end interface 33 inside, which is connected to the front expansion chamber 34. The front expansion chamber 34 is connected to the rear silencing chamber 35, and the rear silencing chamber is connected to the waste heat guiding chamber 36.

[0041] The pre-expansion cavity 34 adopts a cylindrical structure, which weakens low-frequency noise of 100-500Hz through the principle of volume change. A first guide plate 341 and a second guide plate 342 are arranged inside the pre-expansion cavity 34, and the two plates work together to achieve secondary airflow rectification. Both the first guide plate 341 and the second guide plate 342 are provided with perforations 344, which are arranged in multiple rings, each ring of perforations 344 arranged in an equilateral triangle. The equilateral triangle perforations 344 on the first guide plate 341 divert and diffuse the airflow, forming a resonant structure with the cavity wall to enhance low-frequency noise reduction. The equilateral triangle perforations 344 on the second guide plate 342 further refine the airflow distribution, reducing the turbulence of the airflow entering the rear noise-reducing cavity 35. The first guide plate 341 and the second guide plate 342 are both fixed to the inner wall of the expansion chamber by the fixing block 343. By setting the fixing block 343, the first guide plate 341 and the second guide plate 342 are connected to the front expansion chamber 34 while maintaining a certain gap, reserving space for thermal expansion and contraction, and avoiding structural damage caused by high temperature deformation.

[0042] The rear anechoic chamber 35 also adopts a cylindrical cavity design, and a sound-absorbing kit is installed inside the rear anechoic chamber 35. The sound-absorbing kit includes an outer protective panel 351 that is attached to the inner wall of the rear anechoic chamber 35. The outer protective panel 351 is fixed tightly against the inner wall of the cavity, providing support for the sound-absorbing layer 352 and guiding sound waves into it. An inner protective panel 353 is provided inside the outer protective panel 351. The inner protective panel 353 and the outer protective panel 351 are arranged coaxially to form a central airflow channel, ensuring smooth airflow. Both the outer protective panel 351 and the inner protective panel 353 have through holes 344 for exhaust gas to pass through. A sound-absorbing layer 352 is provided between the inner protective panel 353 and the outer protective panel 351. The sound-absorbing layer 352 is made of thick ceramic fiber cotton, and sound energy attenuation is achieved through the frictional conversion of sound waves in the pores of the sound-absorbing layer 352.

[0043] The waste heat guiding cavity 36 is equipped with three spiral guide vanes 361 to extend the airflow residence time, avoid eddy current heat dissipation, and rectify the airflow into a stable spiral flow state to meet the heat exchange requirements of the thermoelectric converter 4. The spiral guide vanes 361 are coated with an anti-scaling coating, which is an Al2O-TiO2 composite ceramic coating.

[0044] The waste heat recovery and silencing device 3 of this ship is mounted on an adjustable carbon steel bracket for installation.

[0045] A marine exhaust heat recovery system includes a mounting base 1 with an exhaust gas inlet pipe 2 connected to the inlet of a marine exhaust heat recovery silencer 3. The outlet of the marine exhaust heat recovery silencer 3 is connected to the high-temperature side of a thermoelectric converter 4 via pipe 81. The low-temperature side of the thermoelectric converter 4 is connected to a heat exchanger 5 via pipe 82. The heat exchanger 5 is connected to a solid heat storage medium 6 via pipe 83. The solid heat storage medium 6 is connected to the inlet of a filter device 7 via pipe 84. The outlet of the filter device 7 is connected to an exhaust gas discharge pipe 9. Pipes 81 to 84 are all made of stainless steel and include an external insulation layer. The thermoelectric converter 4 utilizes the temperature difference between the high-temperature exhaust gas output from the marine exhaust heat recovery silencer 3 and the low-temperature medium to achieve thermoelectric conversion, converting waste heat into electrical energy for use by marine auxiliary equipment. Heat exchanger 5 further recovers the residual heat from the exhaust gas discharged by thermoelectric converter 4 and transfers the heat to the heat transfer medium. Solid heat storage body 6 uses phase change heat storage material to store the heat transferred by heat exchanger 5, realizing the utilization of waste heat across time periods.

[0046] A valve 21, an electric butterfly valve, is installed on the exhaust gas inlet pipe to regulate the total exhaust gas flow rate into the system. A valve 841, an electric ball valve, is installed on pipe 84 to assist in regulating the airflow pressure and velocity within the system.

[0047] The filtration device 7 includes a filter box 70, with a cleaning door 77 on one side for periodically cleaning the filter screens. A first filter screen 71 and a second filter screen 72 are sequentially arranged inside the filter box 70. The pore size of the second filter screen 72 is smaller than that of the first filter screen 71. The two filters sequentially intercept particulate impurities in the exhaust gas, preventing wear on the thermoelectric converter 4 and heat exchanger 5 components. The second filter screen 72 and the first filter screen 71 are respectively located at one end of two mounting frames. An elastic plate 73 is also provided at the other end of the mounting frame. The bottom end of the elastic plate 73 is fixedly connected to the bottom of the mounting frame, and the top end of the elastic plate 73 contacts the mounting frame. The elastic plate 73 is made of a metal material with good elasticity and bending resistance. A sliding push unit is provided at the top of the mounting frame, connected to a reciprocating unit, which in turn is connected to a drive unit located at the top of the filter box 70.

[0048] The drive unit includes a drive housing 741 mounted on top of the filter box 70. A motor 742 is fixedly mounted on the outside of the drive housing 741. A fixing plate 743 is mounted on the top of the inside of the drive housing 741. The fixing plate 743 has a through hole. The output end of the motor 742 passes through the through hole and is fixedly connected to one end of a rotating rod 744. The other end of the rotating rod 744 is rotatably connected to one end of a push rod 745. The other end of the push rod 745 is hinged to a support 746. A connecting rod 747 is located below the support 746. When the motor 742 starts, it drives the rotating rod 744 to rotate through its output end, which in turn drives the support 746 and the connecting rod 747 to reciprocate through the push rod 745.

[0049] The reciprocating unit includes a reciprocating sleeve 751 sleeved outside the connecting rod 747. A retaining ring 752 is fixedly mounted on the reciprocating sleeve 751. An elastic element 753 is positioned above the retaining ring 752. One end of the elastic element 753 is fixedly connected to the retaining ring 752, and the other end is fixedly connected to an upper annular protrusion on the inner wall of the drive housing 741. An elastic element 754 is positioned below the retaining ring 752. One end of the elastic element 754 is fixedly connected to the retaining ring 752, and the other end is fixedly connected to a lower annular protrusion on the inner wall of the drive housing 741.

[0050] The reciprocating sleeve 751 has an internal cavity, within which a sliding plate 755 is installed. The upper end of the sliding plate 755 is fixedly connected to the bottom end of the connecting rod 747. An elastic element 3 756 is sleeved on the outside of the connecting rod 747. One end of the elastic element 3 756 is fixedly connected to the upper inner wall of the cavity, and the other end of the elastic element 3 756 is fixedly connected to the upper end of the sliding plate 755. Below the sliding plate 755, an elastic element 4 757 is installed. One end of the elastic element 4 757 is fixedly connected to the lower end of the sliding plate 755, and the other end of the elastic element 4 757 is fixedly connected to the lower inner wall of the cavity.

[0051] The sliding push unit includes a sliding sleeve 761 fixedly installed at the top of the mounting frame. A sliding rod 762 is slidably connected inside the sliding sleeve 761. The bottom end of the sliding rod 762 passes through the mounting frame and is fixedly connected to the top end of the elastic plate 73.

[0052] The elastic elements 753 to 757 work together to achieve the smooth reciprocating motion of the connecting rod 747, buffering the impact of the motion. Through the pushing action of the connecting rod 747, the sliding plate moves up and down, thereby realizing the up and down reciprocating motion of the reciprocating sleeve 751. The reciprocating sleeve 751 continuously moves up and down, constantly striking the sliding rod 762, causing the sliding rod 762 to move up and down in the sliding sleeve 761, thereby striking the elastic plate 73, causing it to deform and generate vibration to clean the first filter screen 71 and the second filter screen 72.

[0053] In addition to the above structure, this system also includes a safety module, comprising a PLC controller, sensors, and safety valves, with the specific structure as follows:

[0054] A vortex flow sensor is installed inside the exhaust gas inlet pipe 2, with a measurement range of 50-400 m³ / h. 3 / h, accuracy ±1%, real-time monitoring of exhaust gas flow rate.

[0055] The outlet of the ship exhaust waste heat recovery silencing device 3 is equipped with a noise sensor with a measurement range of 40-120 dBA and an accuracy of ±0.5 dBA, which provides feedback on the silencing effect.

[0056] Three platinum resistance temperature sensors (PT100) are evenly installed circumferentially on the outer surface of the outer layer 321 of the muffler housing 32. These sensors are fixed to the outer layer 321 with bolts. The temperature measurement range of the platinum resistance temperature sensors is 0-200℃, with an accuracy of ±0.5℃. The signal output terminals of the platinum resistance temperature sensors are connected to a PLC controller to transmit real-time temperature data of the muffler housing 32 surface. When the temperature at any measuring point is >58℃, the PLC controller triggers an early warning. When the temperature is ≥60℃, the exhaust gas flow rate is adjusted. The PLC controller adjusts the opening of valve 21 and valve 841 to regulate the exhaust gas flow rate, ensuring that the outer surface temperature of the muffler housing 32 remains ≤60℃, meeting the thermal insulation safety standards for marine equipment.

[0057] The steps for adjusting the exhaust gas flow rate are as follows:

[0058] When the platinum resistance temperature sensor detects the temperature of the muffler housing, triggering the control threshold (>58℃ warning, ≥60℃ forced control), the PLC controller adjusts the flow rate according to the following steps:

[0059] Prioritize fine-tuning the opening of valve 21: Based on the current opening, reduce the valve opening in small increments of 5% (e.g., from 80% to 75%) to reduce the total flow of exhaust gas entering the silencer and reduce the heat load conduction of the inner layer of the silencer.

[0060] Auxiliary regulating valve 2 841: Simultaneously adjust the opening of valve 2 841 from the normal 50% to 70%-80%, accelerate the airflow in the system, and avoid internal pressure buildup caused by valve 1 being closed too little.

[0061] Dynamic feedback correction: After each adjustment (5-second interval), the temperature change of the outer shell is monitored by a platinum resistance temperature sensor. If the temperature drops below 55°C, the current opening is maintained; if it is still ≥58°C, the fine adjustment is repeated until the temperature reaches the target. During the adjustment process, the valve opening is always ensured to be no less than 40% to avoid excessively low flow.

[0062] A spring-loaded pressure safety valve is installed on the outlet pipe (the starting section of pipe 81) of the waste heat diversion chamber 36. The nominal pressure of the spring-loaded pressure safety valve is 2.0 kPa, the opening pressure is 1.8 kPa, and the discharge capacity is ≥500 m³ / s. 3 The inlet of the spring-loaded pressure safety valve is connected to the outlet pipe of the waste heat diversion chamber 36, and the outlet is connected to the exhaust gas discharge pipe 9 via a bypass pipe (to prevent the depressurized airflow from directly impacting the engine compartment). When the system experiences abnormal pressure build-up of exhaust gas due to pipe blockage, valve failure, or other reasons, and the pressure in the pipe reaches 1.8 kPa, the PLC controller controls the valve core of the spring-loaded pressure safety valve to open and release pressure; when the pressure drops below 1.2 kPa, the valve core automatically closes and resets. Simultaneously, the status feedback terminal of the spring-loaded pressure safety valve is linked to the PLC controller, and an audible and visual alarm signal is simultaneously emitted during pressure release to prompt operators to troubleshoot the fault and prevent the device from bursting or components from being damaged due to continuous pressure build-up.

[0063] The PLC controller, multiple sensors, and safety valve in the aforementioned safety module are all mature existing technologies in this field, and their principles and circuit connections will not be described in detail here.

[0064] In this embodiment, the specific connection methods of each component all adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0065] The specific operating steps for the waste heat recovery system are as follows:

[0066] Step S1: Open valve 1 21 and close valve 2 841. The high-temperature exhaust gas generated by the ship's main engine / generator 742 enters the front guide cone 31 through the exhaust gas discharge pipe 2. The front guide cone 31 smoothly guides the airflow into the end interface 33, and after preliminary diffusion, it enters the front expansion chamber 34.

[0067] Step S2: After the exhaust gas enters the pre-expansion chamber 34, the sudden change in volume causes acoustic interference, which initially attenuates low-frequency noise.

[0068] The first guide plate 341 receives the core impact of the airflow and divides the airflow into multiple fine streams through the surrounding perforations 344, eliminating large-scale eddies.

[0069] After the airflow is diffused by the perforations 344 distributed in an equilateral triangle, it is further rectified by the perforations 344 distributed in an equilateral triangle on the second guide plate 342, forming a uniformly distributed airflow field.

[0070] After rectification, the airflow enters the rear silencing cavity 35. The mid-to-high frequency sound waves penetrate the inner and outer protective panels 351 and enter the sound-absorbing layer 352. They are absorbed by the heat energy converted by the friction of air molecules, thus reducing the outlet noise.

[0071] Step S3: The silencing high-temperature exhaust gas is rectified into a stable spiral flow by the spiral guide plate 361 of the waste heat guiding cavity 36, and enters the high-temperature side of the thermoelectric converter 4 through the pipeline 81. It generates electricity by temperature difference with the medium on the low-temperature side, realizing the first waste heat recovery.

[0072] After heat exchange by thermoelectric converter 4, the waste gas enters heat exchanger 5 through pipeline 2 82, transferring the residual heat to the heat transfer medium to complete the second waste heat recovery.

[0073] The medium-temperature exhaust gas discharged from heat exchanger 5 enters solid heat storage body 6 through pipeline 383, where the heat is stored by phase change material for subsequent heating or auxiliary power generation.

[0074] Step S4: Open valve 2 841. The low-temperature exhaust gas after heat storage enters the filter device 7 through pipeline 4 84, and passes through the first filter screen 71 (intercepting large particulate impurities) and the second filter screen 72 (intercepting fine particles) in sequence. The purified exhaust gas is discharged in compliance with regulations through the exhaust gas discharge pipeline 9.

[0075] After a period of use, when impurities accumulate on the filter screen, causing an increase in pressure differential, close valve 21, start motor 742, and drive the reciprocating unit to move the sliding push unit up and down, causing the elastic plate 73 to vibrate and shake off the impurities attached to the filter screen. After a certain period of time, turn off motor 742, open cleaning door 77 to remove the impurities, and the cleaning is complete.

[0076] Therefore, the present invention adopts the above-mentioned ship exhaust gas waste heat recovery silencing device and system. Through the combination structure of the front expansion chamber and the rear silencing chamber and the heat preservation design, it can effectively reduce exhaust gas noise and retain exhaust gas waste heat to the maximum extent, providing a stable high-temperature airflow source for subsequent recovery stages. Through the two-stage utilization mode of thermoelectric conversion and heat exchange energy storage, exhaust gas energy can be fully recovered, significantly reducing ship fuel consumption.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A ship exhaust heat recovery system, comprising a ship exhaust heat recovery silencing device, wherein the ship exhaust heat recovery silencing device comprises a front guide cone and a silencer housing connected to each other, wherein an end interface is provided inside the silencer housing, the end interface is connected to a front expansion chamber, the front expansion chamber is connected to a rear silencing chamber, and the rear silencing chamber is connected to a waste heat guide chamber; The pre-expansion chamber is provided with a first guide plate and a second guide plate; The rear silencing cavity is equipped with a sound-absorbing kit; The waste heat diversion cavity is equipped with a spiral guide vane; Both the first guide plate and the second guide plate are provided with perforations, and the perforations are arranged in multiple rings, with each ring of perforations arranged in an equilateral triangle. Both the first guide plate and the second guide plate are fixed to the inner wall of the expansion chamber by fixing blocks; The sound-absorbing kit includes an outer protective panel that is attached to the inner wall of the rear sound-absorbing cavity, an inner protective panel that is disposed on the inner side of the outer protective panel, and a sound-absorbing layer that is disposed between the inner protective panel and the outer protective panel. The outer protective panel has a through hole; Its features are: It also includes a mounting base, on which an exhaust gas inlet pipe is provided. The exhaust gas inlet pipe is connected to the inlet end of the ship's exhaust gas waste heat recovery and silencing device. The outlet end of the ship's exhaust gas waste heat recovery and silencing device is connected to the high-temperature side of the thermoelectric converter through pipe one. The low-temperature side of the thermoelectric converter is connected to the heat exchanger through pipe two. The heat exchanger is connected to the solid heat storage body through pipe three. The solid heat storage body is connected to the inlet end of the filter device through pipe four. The outlet end of the filter device is connected to the exhaust gas discharge pipe.

2. The waste heat recovery system for ship exhaust gas according to claim 1, characterized in that: Valve 1 is installed on the exhaust gas discharge pipeline, and valve 2 is installed on the pipeline 4.

3. The waste heat recovery system for ship exhaust gas according to claim 2, characterized in that: The filtration device includes a filter box, in which a first filter screen and a second filter screen are sequentially arranged. The second filter screen and the first filter screen are respectively arranged in one end of two mounting frames. An elastic plate is also provided at the other end of the mounting frame. The bottom end of the elastic plate is fixedly connected to the bottom of the mounting frame, and the top end of the elastic plate is in contact with the mounting frame. The top of the mounting frame is provided with a sliding push unit, which is connected to a reciprocating unit. The reciprocating unit is connected to a drive unit, which is located at the top of the filter box.

4. The waste heat recovery system for ship exhaust gas according to claim 3, characterized in that: The drive unit includes a drive housing disposed at the top of the filter box. A motor is fixedly disposed on the outside of the drive housing. A fixing plate is disposed at the top of the inside of the drive housing. A through hole is provided on the fixing plate. The output end of the motor passes through the through hole and is fixedly connected to one end of a rotating rod. The other end of the rotating rod is rotatably connected to one end of a push rod. The other end of the push rod is hinged to a support. A connecting rod is disposed below the support.

5. A ship exhaust gas waste heat recovery system according to claim 4, characterized in that: The reciprocating unit includes a reciprocating sleeve sleeved outside the connecting rod. A retaining ring is fixedly provided on the reciprocating sleeve. An elastic element is provided above the retaining ring. One end of the elastic element is fixedly connected to the retaining ring, and the other end of the elastic element is fixedly connected to an upper annular protrusion on the inner wall of the drive housing. Below the retaining ring, there is an elastic element two. One end of the elastic element two is fixedly connected to the retaining ring, and the other end of the elastic element two is fixedly connected to the lower ring protrusion on the inner wall of the drive housing.

6. A ship exhaust gas waste heat recovery system according to claim 5, characterized in that: The reciprocating sleeve has an internal cavity, and a sliding plate is installed inside the cavity. The upper end of the sliding plate is fixedly connected to the bottom end of the connecting rod. An elastic element three is sleeved on the outside of the connecting rod. One end of the elastic element three is fixedly connected to the upper inner wall of the cavity, and the other end of the elastic element three is fixedly connected to the upper end of the sliding plate. An elastic element four is provided below the sliding plate. One end of the elastic element four is fixedly connected to the lower end of the sliding plate, and the other end of the elastic element four is fixedly connected to the lower inner wall of the cavity.

7. A ship exhaust gas waste heat recovery system according to claim 6, characterized in that: The sliding push unit includes a sliding sleeve fixedly installed at the top of the mounting frame, and a sliding rod slidably connected inside the sliding sleeve. The bottom end of the sliding rod passes through the mounting frame and is fixedly connected to the top of the elastic plate.

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