Method for Sea Trial Replacement of Special-shaped Turbocharger for Marine Diesel Engine

Abstract

The present invention relates to the technical field of ship supercharger replacement and discloses a sea trial replacement method for special-shaped superchargers of ship diesel engines, which includes the following steps: S1: Preliminary design planning: study the differences in installation technical requirements and installation dimensions between the two superchargers; S2: Overall configuration division of the engine room: take the front end of the upper platform of the engine room as the replacement interval for the two specifications of superchargers, adjust and reasonably arrange the equipment on the upper platform of the engine room, and increase the space in the supercharger replacement area to facilitate the replacement operation of the supercharger; S3: Fabrication of the supercharger base. The present invention eliminates the need for the ship to additionally open process lifting lugs, reducing the additional construction cost. During the sea trial, due to the optimal lifting route of the twin superchargers, the appropriate replacement area, and the firm temporary base, etc., it provides convenience and safety for the construction. The replacement of the supercharger was completed in only half a day, shortening the sea trial time of the ship.

Description

Technical Field

[0001] The present invention relates to the technical field of ship supercharger replacement, and specifically to a sea trial replacement method for special-shaped superchargers of ship diesel engines. Background Art

[0002] The main propulsion diesel engine CX52 of a 50,000-ton chemical tanker is an engineering prototype independently developed in China, and its emissions meet the IMO TierIII requirements after passing through the emission reduction device. The engineering prototype is equipped with two superchargers of different models and brands, namely the Chongqing Jiangzeng supercharger model CAT150 and the ABB supercharger model A165-L.

[0003] In order to solve the scientific research task of replacing the supercharger during the sea trial for the purpose of testing the domestic parts of the R & D main engine on board and completing the in-service ship trial of the domestic R & D main engine, it is necessary to replace the supercharger during the sea trial. Before the sea trial, the supercharger configured on the main engine is the domestic Jiangzeng supercharger. After completing the relevant tests, it is necessary to replace it with the ABB supercharger configured during ship operation for the navigation test. After the sea trial is completed, the task of removing the CAT150 supercharger from the cabin is completed at the shipyard dock.

[0004] Under the limitation of the compact engine room space environment, it is necessary to reasonably arrange the site for replacing the two superchargers without affecting the normal tests of other engine equipment. Under the limited lifting conditions, it is necessary to utilize the lifting capacity of the engine room overhead crane to find a reasonable lifting path for the supercharger, avoiding the limitations of the lifting range and height of the engine room overhead crane and the influence of other equipment and outfitting parts in the engine room. Under the sea condition with severe influence of wind and waves, it is necessary to effectively fix the supercharger during navigation and replacement to reduce the influence of ship sway on the construction. Due to the limitation of the size of the engine room lifting port, it is necessary to solve the scheme for the supercharger to enter and exit the cabin.

[0005] In summary, an efficient and safe supercharger replacement method is needed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a sea trial replacement method for special-shaped superchargers of ship diesel engines to solve the problem of replacing the supercharger under limited lifting environment, severe sea conditions and limited lifting ports as mentioned in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A sea trial replacement method for special-shaped superchargers of ship diesel engines, including the following steps:

[0008] S1: Preliminary Design Planning: Study the differences in installation technical requirements and installation dimensions between the two superchargers;

[0009] S2: Overall configuration division of the engine room: Take the front end of the upper platform of the engine room as the replacement interval for the superchargers of two specifications, adjust and reasonably layout the equipment on the upper platform of the engine room, and increase the space of the supercharger replacement area to facilitate the replacement operation of the superchargers;

[0010] S3: Fabrication of the supercharger base: Make the bases of two superchargers respectively according to the anchor bolt holes of the supercharger in the replacement operation area, and fix the supercharger A165-L before replacement and the supercharger CAT150 after replacement to prevent the supercharger from tipping over due to the ship's sway;

[0011] S4: Simulate the lifting route of the supercharger with a 3D model: Predict in advance the interfering pipe equipment to be disassembled and adjusted, so as to plan the lifting route of the supercharger;

[0012] S5: Design a detachable railing on the upper platform restricted by the lifting height. After the lifting is completed, it can be restored in time to avoid hot work construction, increasing the construction efficiency;

[0013] S6: Lifting preparation;

[0014] S7: Remove the supercharger CAT150;

[0015] S8: Install the supercharger A165-L;

[0016] S9: Remove the CAT150 supercharger from the cabin;

[0017] S10: Remove the supercharger base.

[0018] Preferably, the lifting preparation in S6 specifically includes the following steps:

[0019] 6.1. The engine room traveling crane works normally and can cover the lifting range required by the construction;

[0020] 6.2. Before the trial voyage, the lifting personnel conduct on-site inspection and add necessary lifting lugs according to the actual requirements;

[0021] 6.3. Prepare necessary slings and rigging;

[0022] 6.4. Prepare the necessary tools for installing the supercharger; a non-standard wrench of 34 for hexagon, a positioning guide rod;

[0023] 6.5. Prepare 2 sets of high-pressure air outlets, low-pressure air inlets, and exhaust ports, as well as the equipped nuts and bolts, spare fastening bolts, and prepare necessary installation auxiliary materials;

[0024] 6.6. Prepare 1 set of flange gaskets for high-pressure air outlets, low-pressure air inlets, and exhaust ports;

[0025] 6.7. Confirm the placement of the supercharger A165-L. The supercharger A165-L must be fixed on the base on the starboard side first. The supercharger CAT150 should be removed and placed on the empty base on the left side of the supercharger A165-L.

[0026] 6.8. Prepare the hoisting guide rope to ensure the rotation direction and stability of the supercharger after it is lifted.

[0027] Preferably, in S7, the hoisting route after removing the supercharger CAT150 is as follows:

[0028] 7.1. Remove the supercharger CAT150 and lift it upwards directly;

[0029] 7.2. Lift to the port side and toward the bow;

[0030] 7.3. After crossing the upper platform railing, hoist it to the starboard side to the fixed base.

[0031] The preferred hoisting route for installing the supercharger A165-L in S8 is as follows:

[0032] 8.1. Lift the supercharger upward from its fixed position on the base;

[0033] 8.2. Cross the upper platform railing and lift it backward to the top of the main engine supercharger installation location, ready for installation.

[0034] Preferably, the specific steps of removing the supercharger CAT150 in S7 are as follows:

[0035] 7.1.1 After the CTA150 turbocharger stops supplying oil and gas for 4 hours, the turbocharger can be disassembled from the main engine only when the temperature is ≤50℃;

[0036] 7.1.2 Remove the external insulation covering of the round-the-sky transfer pipe and expansion joint;

[0037] 7.1.3 Remove bolts and accessories;

[0038] 7.1.4 Lift off the expansion joint and the circumference-square adapter separately and place them securely on the platform on the port side of the main engine;

[0039] 7.1.5 Remove the speed sensor connection cable and all exhaust and air pipes;

[0040] 7.1.6 Remove the lubricating oil inlet and return pipes and install the sealing covers of the lubricating oil inlet and return pipes to prevent foreign matter from entering;

[0041] 7.1.7 Fix the lifting device to the lifting lugs of the bearing housing and tighten lightly;

[0042] 7.1.8 Remove the base mounting bolts;

[0043] 7.1.9 Recheck whether there are any bolts that have not been removed at each connection point;

[0044] 7.1.10 Slowly lift the supercharger off the diesel engine bracket and lift it to the supercharger base for fixation according to the lifting route.

[0045] Preferably, the specific steps for installing the A165-L supercharger in S8 are as follows:

[0046] 8.2.1 Remove the protective cover outside the ABB supercharger;

[0047] 8.2.2 Fix the hoisting device of the overhead crane on the lifting lug of the bearing housing and gently tighten it, and remove the bolts on the base of the A165-L supercharger;

[0048] 8.2.3 Lift the ABB and hoist it above the installation position according to the ABB lifting route;

[0049] 8.2.4 Slowly lower the ABB supercharger onto the base, and position the anchor bolt holes with taper pins; after inserting the bolts, tighten them;

[0050] 8.2.5 Disconnect the hoisting device;

[0051] 8.2.6 Install the flange gaskets for the exhaust gas and intake pipes;

[0052] 8.2.7 Fasten the gas and intake pipe flanges with bolts;

[0053] 8.2. The expansion joint is installed according to the installation length requirement of the expansion joint;

[0054] 8.2.9 Check the cleanliness of the transfer slip oil breather pipe;

[0055] 8.2.10 After removing the sealing cover, reinstall each transfer pipe;

[0056] 8.2.11 Reinstall the expansion joint round-to-square adapter and reinstall the heat insulation coating.

[0057] Preferably, in S8, restricted by the size of the hatch lifting opening of 1100mm×1400mm, the sizes of both superchargers are larger than the size of the lifting opening. Therefore, the A165-L supercharger is pre-embedded into the cabin during the construction stage and placed on the supercharger base.

[0058] Preferably, in S9, when the CAT150 supercharger is disassembled and taken out of the cabin, according to the structural principle of the CAT150 supercharger, the supercharger is divided into three parts: the silencer, the gas inlet housing, the integrated impeller housing and the air exhaust housing as a whole for taking out of the cabin.

[0059] Preferably, in S10: The supercharger base is removed by cutting with an oxyacetylene torch.

[0060] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0061] The method for the supercharger to enter and exit the engine room formulated by the present invention for realizing the double supercharger replacement test eliminates the need for the ship to additionally open a process lifting port, reducing the additional cost of construction. During the sea trial, due to the optimal lifting route of the double supercharger, the appropriate replacement area, the firm temporary base, etc., it provides convenience and safety for the construction. The replacement of the supercharger was completed in only half a day, shortening the sea trial time of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a flowchart of the sea trial replacement method of the special-shaped supercharger for ship diesel engines of the present invention;

[0063] Figure 2 is the layout diagram of the supercharger of the present invention

[0064] Figure 3 is a schematic diagram of the 3D lifting route of the supercharger CAT150 of the present invention (viewed from the tail to the bow);

[0065] Figure 4 is a schematic diagram of the 3D lifting route of the supercharger CAT150 of the present invention (top view);

[0066] Figure 5 is a schematic diagram of the 3D lifting route of the supercharger CAT150 of the present invention (side view);

[0067] Figure 6 is a schematic diagram of the 3D lifting route of the supercharger A165-L of the present invention (side view);

[0068] Figure 7 is a schematic diagram of the 3D lifting route of the supercharger A165-L of the present invention (axial view);

[0069] Figure 8 is the front view of the supercharger base of the present invention;

[0070] Figure 9 is a schematic diagram of the connection state between the supercharger base and the supercharger of the present invention;

[0071] Figure 10 is the layout diagram of the equipment on the upper platform of the engine room and the layout diagram of the supercharger of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0072] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0073] Embodiment 1: Please refer to Figure 1The present invention provides a technical solution: a method for replacing a special-shaped supercharger of a marine diesel engine during sea trials, comprising the following steps:

[0074] S1: Preliminary design planning: Study the differences in installation technical requirements and installation dimensions of the two superchargers; the two superchargers are supercharger A165-L (also known as ABB supercharger) and supercharger CAT150 (also known as Jiangzeng supercharger).

[0075] S2: Cabin overall configuration division: please refer to Figure 10 , Figure 10 The layout of the equipment and supercharger layout of the cabin upper platform of the present invention is as follows: the front end of the cabin upper platform is used as the replacement area of the two specifications of superchargers. The equipment on the cabin upper platform is adjusted and arranged reasonably, and the space of the supercharger replacement area is increased to facilitate the replacement operation of the supercharger;

[0076] S3: Booster base production: please refer to Figure 8 and Figure 9 , Figure 8 This is a front view of the supercharger base of the present invention; Figure 9 This is a schematic diagram of the connection between the supercharger base and the supercharger of the present invention.

[0077] In the replacement operation area, two supercharger bases were made according to the supercharger anchor installation holes, and the supercharger A165-L before replacement and the supercharger CAT150 after replacement were fixed to prevent the supercharger from rolling over due to the shaking of the ship;

[0078] S4: 3D model simulation of the supercharger lifting route: Predict in advance the interference of pipe equipment and other equipment for disassembly and assembly, and make adjustments to them to plan the supercharger lifting route;

[0079] S5: A detachable handrail is designed on the upper platform, which is subject to lifting height restrictions. This handrail can be promptly restored after the lifting is completed, avoiding hot work and increasing construction efficiency.

[0080] S6: Preparation for lifting;

[0081] S7: Remove the supercharger CAT150;

[0082] S8: Installing supercharger A165-L; Due to the size of the cabin lifting port (1100mm×1400mm), the dimensions of both superchargers are larger than the lifting port. Therefore, supercharger A165-L is pre-buried into the cabin during the construction phase and placed on the supercharger base.

[0083] S9: Disassembly and removal of CAT150 supercharger; When disassembling and removing the CAT150 supercharger, the supercharger is divided into three parts according to the structural principle of the supercharger CAT150: muffler, gas inlet shell, hollow blade integrated shell and air exhaust shell, and the whole is removed from the cabin.

[0084] S10: Remove the supercharger base. Use a gas cutting torch to remove the supercharger base.

[0085] See also Figure 2 , Figure 2 This is the supercharger layout diagram.

[0086] The hoisting preparation in S6 specifically includes the following steps:

[0087] 6.1. The nacelle crane is functioning normally and can cover the lifting range required for construction;

[0088] 6.2. Before the sea trial, the hoisting personnel shall conduct on-site inspection and add necessary lifting lugs according to actual requirements;

[0089] 6.3. Prepare necessary slings;

[0090] 6.4. Prepare the necessary tools for installing the supercharger; non-standard hexagonal wrench 34, positioning guide rod, etc.

[0091] 6.5. Prepare two sets of high-pressure outlets, low-pressure inlets, and exhaust ports, along with the corresponding nuts and bolts, spare fastening bolts, and necessary installation materials, such as anti-seize assembly paste (e.g., gold butter copper powder).

[0092] 6.6. One set of flange sealing gaskets must be prepared for the high-pressure air outlet, low-pressure air inlet, and exhaust port;

[0093] 6.7. Confirm the placement of the supercharger A165-L. The supercharger A165-L must be fixed on the base on the starboard side first. The supercharger CAT150 should be removed and placed on the empty base on the left side of the supercharger A165-L.

[0094] 6.8. Prepare the hoisting guide rope to ensure the rotation direction and stability of the supercharger after it is lifted.

[0095] See also Figures 3 - 5 ,

[0096] Figure 3 This is a schematic diagram of the 3D hoisting route of the supercharger CAT150 of the present invention (viewed from the tail to the bow);

[0097] Figure 4 3D hoisting route diagram of the supercharger CAT150 of the present invention (top view);

[0098] Figure 5 Schematic diagram of the CAT150 3D hoisting route for the supercharger of the present invention (side view)

[0099] In S7, the lifting route after removing the supercharger CAT150 is as follows:

[0100] 7.1. Remove the supercharger CAT150 and lift it upwards directly;

[0101] 7.2. Lift to the port side and toward the bow;

[0102] 7.3. After crossing the upper platform railing, hoist it to the starboard side to the fixed base.

[0103] Figures 3 - 5 The direction marked by the black arrow is the direction of the lifting route.

[0104] See also Figures 6 - 7 , Figure 6 This is a schematic diagram of the lifting route of the supercharger A165-L 3D of the present invention (side view). Figure 7 This is a schematic diagram of the 3D hoisting route of the supercharger A165-L of the present invention (axial view).

[0105] The hoisting route for installing the supercharger A165-L in S8 is as follows:

[0106] 8.1. Lift the supercharger upward from its fixed position on the base;

[0107] 8.2. Cross the upper platform railing and lift it backward to the top of the main engine supercharger installation location, ready for installation.

[0108] Figure 6 The direction marked by the black arrow is the direction of the lifting route.

[0109] The specific steps for removing the supercharger CAT150 in S7 are as follows:

[0110] 7.1.1 After the CTA150 turbocharger stops supplying oil and gas for 4 hours, the turbocharger can be disassembled from the main engine only when the temperature is ≤50℃;

[0111] 7.1.2 Remove the external insulation covering of the round-the-sky transfer pipe and expansion joint;

[0112] 7.1.3 Remove bolts and accessories;

[0113] 7.1.4 Lift off the expansion joint and the circumference-square adapter separately and place them securely on the platform on the port side of the main engine;

[0114] 7.1.5 Remove the speed sensor connection cable and all exhaust and air pipes;

[0115] 7.1.6 Remove the lubricating oil inlet and return pipes and install the sealing covers of the lubricating oil inlet and return pipes to prevent foreign matter from entering;

[0116] 7.1.7 Fix the lifting device to the lifting lugs of the bearing housing and tighten lightly;

[0117] 7.1.8 Remove the base mounting bolts;

[0118] 7.1.9 Recheck if there are any bolts that have not been removed at each connection point;

[0119] 7.1.10 Slowly lift the supercharger off the diesel engine bracket and lift it to the supercharger base for fixation according to the lifting route.

[0120] The specific steps for installing the A165-L supercharger in S8 are as follows:

[0121] 8.2.1 Remove the protective cover outside the ABB supercharger;

[0122] 8.2.2 Fix the overhead crane lifting device on the lifting lugs of the bearing housing and gently tighten it, then remove the bolts on the base of the A165-L supercharger;

[0123] 8.2.3 Lift the ABB and lift it above the installation position according to the ABB lifting route;

[0124] 8.2.4 Slowly lower the ABB supercharger onto the base, use a taper pin to locate the anchor bolt holes; after inserting the bolts, tighten them;

[0125] 8.2.5 Disconnect the lifting device;

[0126] 8.2.6 Install the exhaust gas and intake pipe flange gaskets;

[0127] 8.2.7 Fasten the gas and intake pipe flanges with bolts;

[0128] 8.2.8 Install the expansion joint according to the installation length requirements of the expansion joint;

[0129] 8.2.9 Check the cleanliness of the transfer slip oil pipe breather pipe;

[0130] 8.2.10 After removing the sealing cover, reinstall each transfer pipe; there are 4 in total, including 1 lubricating oil inlet pipe, 1 lubricating oil outlet pipe, 1 flushing pipe, and 1 breather pipe.

[0131] 8.2.11 Reinstall the expansion joint round-to-square adapter and reinstall the heat insulation cladding.

[0132] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. Method for replacing a special-shaped supercharger of a marine diesel engine during sea trial, characterized in that: It includes the following steps: S1: Preliminary design and planning: Study the differences in installation technical requirements and installation dimensions between the two superchargers; S2: Overall configuration division of the engine room: Take the front end of the upper platform of the engine room as the replacement interval for the two specifications of superchargers, adjust and reasonably layout the equipment on the upper platform of the engine room, and increase the space in the supercharger replacement area to facilitate the replacement operation of the supercharger; S3: Fabrication of the supercharger base: Make the bases for the two superchargers respectively according to the anchor mounting holes of the supercharger in the replacement operation area, and fix the supercharger A165-L before replacement and the supercharger CAT150 after replacement to prevent the supercharger from tipping over due to the ship's sway; S4: Simulate the lifting route of the supercharger with a 3D model: Predict in advance the pipe equipment that interferes with disassembly and assembly, and adjust it to plan the lifting route of the supercharger; S5: Design a detachable railing on the upper platform restricted by the lifting height. After the lifting is completed, it can be restored in time to avoid hot work construction, increasing the construction efficiency; S6: Lifting preparation; S7: Remove the supercharger CAT150; S8: Install the supercharger A165-L; S9: Remove the CAT150 supercharger out of the cabin; S10: Remove the supercharger base.

2. The method for sea trial replacement of the special-shaped supercharger of a marine diesel engine according to claim 1, characterized in that: The specific lifting preparation in S6 includes the following steps: 6.

1. The engine room overhead crane works normally and can cover the lifting range required by the construction; 6.

2. Before the sea trial, the lifting personnel conduct on-site inspection and add necessary lifting lugs according to the actual requirements; 6.

3. Prepare necessary slinging tools; 6.

4. Prepare the necessary tools for installing the supercharger; a non-standard wrench of 34 for hexagon and a positioning guide rod; 6.

5. Prepare 2 sets of high-pressure air outlet, low-pressure air inlet, and exhaust ports, as well as the equipped nuts and bolts, spare fastening bolts, and prepare necessary installation auxiliary materials; 6.

6. Prepare 1 set of flange gaskets for the high-pressure air outlet, low-pressure air inlet, and exhaust ports; 6.

7. Confirm the placement position of the supercharger A165-L; The supercharger A165-L must be fixed on the base on the starboard side first, and after the supercharger CAT150 is removed, it is placed on the empty base on the left side of the supercharger A165-L; 6.

8. Prepare a lifting guide rope to prepare for the rotation direction and stability of the supercharger after it is lifted.

3. The method for sea trial replacement of the special-shaped supercharger of a marine diesel engine according to claim 1, wherein: In S7, the lifting route after removing the supercharger CAT150 is as follows: 7.

1. After removing the supercharger CAT150, lift it directly upwards; 7.

2. Hoist it to the port side position and hoist it towards the bow direction; 7.

3. After crossing the upper platform railing, hoist it to the fixed base on the starboard side.

4. The method for sea trial replacement of the special-shaped supercharger for a marine diesel engine according to claim 1, wherein: In S8, the lifting route for installing the supercharger A165-L is as follows: 8.

1. Lift it upwards from the fixed position of the supercharger base; 8.

2. Cross the upper platform railing and hoist it backwards to the position above the main engine supercharger installation position to prepare for installation.

5. The method for sea trial replacement of the special-shaped supercharger of a marine diesel engine according to claim 1, characterized in that: The specific steps for removing the supercharger CAT150 in S7 are as follows: 7.1.1 After the CTA150 supercharger stops fuel supply and gas supply for 4 hours, check that the temperature ≤ 50 °C before proceeding with the work of removing the supercharger from the main engine; 7.1.2 Remove the external insulation covering of the square-round transition pipe and expansion joint; 7.1.3 Remove the bolts and accessories; 7.1.4 Lift off the expansion joint and the square-round transition joint separately and place them securely on the platform on the starboard side of the main engine. 7.1.5 Disconnect the connecting cable of the speed sensor and remove all exhaust gas and air pipelines. 7.1.6 Disconnect the lubricating oil inlet and return pipelines and install sealing caps on the lubricating oil inlet and return ports to prevent foreign objects from entering. 7.1.7 Fix the lifting device on the lifting lugs of the bearing housing and tighten it gently. 7.1.8 Remove the base mounting bolts. 7.1.9 Recheck if there are any bolts that have not been removed at each connection point. 7.1.10 Slowly lift the supercharger off the diesel engine bracket and lift it to the fixed supercharger base according to the lifting route.

6. The method for sea trial replacement of the special-shaped supercharger of a marine diesel engine according to claim 1, characterized in that: The specific steps for installing the supercharger A165-L in S8 are as follows: 8.2.1 Remove the protective cover outside the ABB supercharger. 8.2.2 Fix the overhead crane lifting device on the lifting lugs of the bearing housing and tighten it gently, then remove the bolts on the base of the supercharger A165-L. 8.2.3 Lift the ABB and, according to the ABB lifting route, lift it above the installation position. 8.2.4 Slowly lower the ABB supercharger onto the base, use a taper pin to locate the anchor bolt holes; after inserting the bolts, tighten them. 8.2.5 Disconnect the lifting device. 8.2.6 Install the exhaust gas and intake pipe flange gaskets. 8.2.7 Fasten the gas and intake pipe flanges with bolts. 8.2.8 Install the expansion joint according to the installation length requirement of the expansion joint. 8.2.9 Check the cleanliness of the transfer slip oil breather pipe. 8.2.10 After removing the sealing cap, reinstall each transfer pipe. 8.2.11 Reinstall the expansion joint square-round transition joint and reinstall the heat insulation cladding.

7. The method for sea trial replacement of the special-shaped supercharger of a marine diesel engine according to claim 1, characterized in that: In S8, limited by the size of the hatch lifting port, which is 1100mm×1400mm, the sizes of both superchargers are larger than the size of the lifting port. Therefore, the supercharger A165-L is pre-embedded into the cabin during the construction stage and placed on the supercharger base.

8. The sea trial replacement method of the special-shaped supercharger for ship diesel engines according to claim 1, characterized in that: In S9, when disassembling and removing the CAT150 supercharger from the cabin, the supercharger is divided into three parts according to the structural principle of the CAT150 supercharger: the silencer, the gas inlet housing, and the integral housing of the airfoil and the air exhaust housing, and they are removed from the cabin as a whole.

9. The method for sea trial replacement of the special-shaped supercharger for marine diesel engines according to claim 1 is characterized in that: S10: When removing the supercharger base, use a gas cutting torch to cut and remove it.

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