A method for centering installation of a ship wall-mounted GCU combustion chamber and a ship

Abstract

The application discloses a method for centering installation of a wall-mounted GCU combustion chamber of a ship and the ship, and belongs to the field of ship building. The method comprises the following six steps: presetting a temporary jacking base, placing a temporary jacking device, hoisting the GCU combustion chamber, adjusting the centering of the GCU combustion chamber and the exhaust pipe, welding the equipment base and the exhaust pipe, and removing the temporary jacking base and the jacking device. The method does not need additional hoisting facilities, saves operation cost, and improves operation efficiency. The method is convenient and simple to use, easy to adjust, improves the quality and efficiency of centering adjustment, shortens the construction period, and is suitable for all ships using wall-mounted GCUs without adding any new equipment and facilities, and has strong adaptability and meets the production needs.

Description

Technical Field

[0001] This invention relates to the installation of GCUs in the field of shipbuilding, and more particularly to a method for centering the combustion chamber of a ship-mounted GCU and a ship thereof. Background Technology

[0002] The gas combustion unit (GCU) is a crucial system on ships, primarily used in LNG carriers or other vessels using natural gas as fuel. It burns off excess natural gas emitted from the ship or impure natural gas displaced from cargo holds to prevent direct atmospheric emissions and pollution, thus mitigating the greenhouse effect. Because the GCU must meet the demand for instantaneous combustion of large quantities of natural gas, it releases a significant amount of heat during operation. Therefore, strict control over the alignment and installation accuracy of its combustion chamber and exhaust pipe is necessary to accommodate thermal expansion.

[0003] In actual production, the GCUs used are mainly manufactured by SAACKE and ALFA LAVAL. These manufacturers typically produce floor-mounted GCUs, which can be adjusted and installed after the equipment is hoisted into place. However, in recent years, as equipment manufacturers have continuously optimized costs, ALFA LAVAL has introduced a wall-mounted GCU. This GCU comes with four vertical feet for welding to the inner wall of the exhaust pipe provided by the shipyard. These four feet can extend and retract along the diameter; during hoisting, they first retract inwards, and after adjustment, they extend outwards to the inner wall of the exhaust pipe before fixing the foot bolts and welding the feet to the exhaust pipe.

[0004] The main methods currently used for aligning the combustion chamber of this type of wall-mounted GCU are as follows:

[0005] The first method involves using a crane for adjustment during hoisting. Four hoists are attached to the bottom of the crane and connected to four measuring points on the top of the GCU combustion chamber. After the crane initially lifts the GCU into place, it remains stationary while the four hoists are adjusted to align the GCU with the exhaust pipe. Then, the base is extended, fixed, and welded. This method requires a significant amount of crane resources, and measuring the alignment of the GCU combustion chamber with the exhaust pipe in this state is extremely difficult, posing considerable construction challenges.

[0006] The second method involves installing four hoists or other tools at four measuring points on the top of the exhaust pipe and at four points in the GCU combustion chamber to align the GCU with the exhaust pipe. Then, the base is extended, fixed, and welded. This method requires adjusting equipment weighing tens of tons using hoists or other tools, which is very time-consuming, labor-intensive, and presents significant construction difficulties.

[0007] The third method involves welding four baffles to the corresponding positions on the GCU exhaust pipe to fix the four feet before subsequent alignment adjustments. This method relies on the feet to bear the load, making radial movement of the feet very difficult, and adjusting the height of the feet is also difficult. Therefore, this solution is extremely challenging to construct.

[0008] In summary, the current process of aligning and installing the combustion chamber of a ship's wall-mounted GCU is fraught with difficulties, including high construction difficulty, time and labor costs, and difficulty in alignment adjustments. There is a lack of a simple, fast, and effective method to achieve the alignment of the GCU combustion chamber and the exhaust pipe. Summary of the Invention

[0009] To address the problems existing in the prior art, the present invention aims to provide a method and vessel for aligning and installing a wall-mounted GCU combustion chamber. The present invention does not involve any new equipment or facilities, can reduce construction difficulty, shorten the construction period, improve construction quality, and is applicable to all vessels using wall-mounted GCUs.

[0010] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0011] A first aspect of the present invention provides a method for centering and installing a wall-mounted gas combustion chamber (GCU) on a ship, the ship including an exhaust pipe, a GCU combustion chamber, and a GCU airbox, the GCU combustion chamber including a base, a base support plate, and base bolts, the centering and installation method comprising the following steps:

[0012] S1. Pre-set temporary lifting base: Based on the pre-installation position of the GCU combustion chamber, determine the installation position of the temporary lifting base, and pre-set a temporary lifting base that can bear half the weight of the GCU combustion chamber at the upper end of the GCU air box.

[0013] S2. Place temporary lifting equipment, which includes a lifting short pipe and a lifting cylinder: Place the lifting short pipe and the lifting cylinder from bottom to top on the upper surface of the temporary lifting base, adjust the height of the temporary lifting equipment to the pre-installation position of the GCU combustion chamber, and at the same time retain the stroke margin for the lifting cylinder to be adjusted up and down.

[0014] S3. Hoisting the GCU combustion chamber: The base feet are retracted inward to the innermost position and fixed in sequence. The GCU combustion chamber is hoisted into the exhaust pipe. The position of the GCU combustion chamber is adjusted to the pre-installation position. At the same time, the height of the temporary lifting equipment is adjusted so that the upper end face of the lifting cylinder is in contact with the lower end face of the GCU combustion chamber.

[0015] S4. Centering and adjusting the GCU combustion chamber and exhaust pipe: Install a radial adjustment cylinder between the inner wall of the exhaust pipe and the base. Adjust the gap between the base and the exhaust pipe by adjusting the radial adjustment cylinder. Select a measuring point on the upper end face of the GCU combustion chamber that is directly above the temporary lifting device. Adjust the gap between the measuring point and the exhaust pipe by adjusting the height of the lifting cylinder. When the gap deviation between the base and the inner wall of the exhaust pipe and the gap deviation between the measuring point and the inner wall of the exhaust pipe both do not exceed 1mm, maintain the position of the GCU combustion chamber and end the centering adjustment.

[0016] S5. Weld the base foot and exhaust pipe: Loosen the base foot bolts between the base foot and the base foot support plate in sequence, move the base foot outward until the base foot contacts the inner wall of the exhaust pipe, and then weld and fix the base foot and exhaust pipe in sequence.

[0017] S6. Remove the temporary jacking base and temporary jacking equipment: After welding is completed, loosen the jacking equipment and remove all temporary equipment and materials added to the GCU air box. All temporary equipment and materials added include the temporary jacking base, jacking short pipe and jacking cylinder.

[0018] As a preferred technical solution, the GCU combustion chamber further includes a robust structure for lifting. The pre-set temporary lifting base in S1 includes the following specific steps.

[0019] S1-1. Based on the pre-installation position of the GCU combustion chamber base, the pre-installation position of the base is horizontally deflected by 45° as the installation position of the temporary lifting base in the circumferential direction.

[0020] S1-2. Based on the location of the strong structure in the GCU combustion chamber, the location directly below the strong structure is taken as the installation position of the temporary lifting base in the diameter direction.

[0021] S1-3. Based on the installation position in the circumferential and diametrical directions determined by the temporary lifting base, a steel plate for setting the temporary lifting base is horizontally extended inward on the panel of the upper end face of the GCU air box. A triangular plate with the same thickness as the steel plate is vertically connected to the lower end face of the steel plate to strengthen the support strength, so that the support strength can bear half the weight of the GCU combustion chamber.

[0022] As a preferred technical solution, in the step S2 of placing the temporary lifting device, the specific steps of adjusting the height of the temporary lifting device to the pre-installation position of the GCU combustion chamber include: adjusting the lifting cylinder to make the total height of the lifting short pipe and the lifting cylinder equal to the distance from the upper end face of the GCU air box to the lower end face of the GCU combustion chamber rigid structure after final installation; the specific steps of retaining the stroke margin for the lifting cylinder to be adjusted up and down include: pushing the plunger on the lifting cylinder out of the preset position to a certain extent, so that the upward stroke and downward stroke of the plunger are not less than 20mm.

[0023] As a preferred technical solution, in the step of hoisting the GCU combustion chamber in S3, the specific steps of retracting the base foot inward to the innermost position include: loosening the base foot bolts between the base foot and the base foot support plate in sequence, retracting the base foot inward to the innermost position where it will not contact the inner wall of the exhaust pipe, leaving a gap between the base foot and the inner wall of the exhaust pipe for subsequent installation of the radial adjustment cylinder, and then tightening the base foot bolts in sequence to fix the base foot; the specific steps of adjusting the height of the temporary lifting equipment include: finely adjusting the height of the lifting cylinder so that the upper end face of the lifting cylinder is in contact with the lower end face of the strong structure of the GCU combustion chamber.

[0024] As a preferred technical solution, the alignment and adjustment of the GCU combustion chamber and exhaust pipe in step S4 includes the following specific steps.

[0025] S4-1. Measure the distance from the base to the inner wall of the exhaust pipe, and calculate the distance deviation between the two opposite bases;

[0026] S4-2. Install a radial adjustment cylinder at the foot with the smaller distance from the inner wall of the exhaust pipe among the two opposite feet. The radial adjustment cylinder is located between the inner wall of the exhaust pipe and the foot. Adjust the horizontal position of the GCU combustion chamber radially by adjusting the radial adjustment cylinder so that the distance difference between the foot at the adjustment point of the radial adjustment cylinder and the inner wall of the exhaust pipe and the distance difference between the foot at the opposite position and the inner wall of the exhaust pipe are both less than 1mm. After the adjustment is completed, remove the radial adjustment cylinder.

[0027] S4-3. Repeat the operation of S4-2 for the other set of opposite feet until the distance difference between the feet and the inner wall of the exhaust pipe is less than 1mm, thus completing the centering adjustment of the feet in the horizontal direction at the bottom of the exhaust pipe.

[0028] S4-4. Select a measurement point on the upper end face of the GCU combustion chamber. The measurement point is located directly above the temporary lifting equipment in the vertical direction. Measure the distance from the measurement point to the inner wall of the exhaust pipe and calculate the distance deviation between the two relative measurement points.

[0029] S4-5. The gap between the measuring point and the exhaust pipe is changed by sequentially adjusting the height of the lifting cylinder by the plunger on the lifting cylinder. The lifting cylinder below the measuring point with the smaller distance from the inner wall of the exhaust pipe is raised, or the lifting cylinder below the measuring point with the larger distance from the inner wall of the exhaust pipe is lowered, so that the distance difference between the measuring point and the inner wall of the exhaust pipe is less than 1mm, thus completing the centering adjustment of each measuring point on the upper end face of the GCU combustion chamber in the horizontal direction of the exhaust pipe.

[0030] S4-6. When the gap deviation between the base and the inner wall of the exhaust pipe and the gap deviation between the measuring point and the inner wall of the exhaust pipe both do not exceed 1mm, maintain the position of the GCU combustion chamber, lock the lifting cylinder, and end the centering adjustment.

[0031] As a preferred technical solution, in the step S5 of welding the base and the exhaust pipe, before the step of welding and fixing the base and the exhaust pipe, the position of the base can be strengthened by tightening the base bolts between the base and the base support plate.

[0032] As a preferred technical solution, in the step of removing the temporary lifting base and temporary lifting equipment in S6, after removing all the temporarily added equipment and materials on the GCU air box, the GCU air box is restored to a state that facilitates the completion of other finishing work required for the subsequent installation of the GCU combustion chamber.

[0033] In a second aspect, the present invention provides a ship having a wall-mounted GCU combustion chamber, comprising a wall-mounted GCU combustion chamber, wherein the wall-mounted GCU combustion chamber is installed on the hull according to any one of the above-described centering installation methods.

[0034] As described above, the present invention has the following beneficial effects:

[0035] (1) The present invention provides a method for centering and installing a ship-mounted GCU combustion chamber, and a ship thereof. The method of the present invention does not involve any new equipment or facilities and does not require additional implementation costs.

[0036] (2) The present invention provides a method for centering and installing a ship-mounted GCU combustion chamber and a ship. The method of the present invention is simple and convenient to use, greatly reduces the difficulty of centering and adjustment, and thus improves the adjustment quality and efficiency, and can effectively save the construction period.

[0037] (3) The present invention provides a method for centering and installing a combustion chamber of a wall-mounted GCU on a ship and a ship. The method of the present invention has a wide range of applications and can be applied to all ships using wall-mounted GCUs. Attached Figure Description

[0038] Figure 1This is an operation flowchart of the method for centering and installing the combustion chamber of a ship-mounted GCU according to the present invention.

[0039] Figure 2 This is a schematic diagram of the arrangement of the GCU combustion chamber, GCU air box, and exhaust pipe in the method for centering the wall-mounted GCU combustion chamber of the present invention.

[0040] Figure 3 This is a schematic diagram of the structure of the base of the GCU combustion chamber in the method for centering and installing the combustion chamber of a ship-mounted GCU according to the present invention.

[0041] Figure 4 This is a front view of the arrangement of the GCU air box and the temporary lifting base in the method for centering and installing the combustion chamber of a ship-mounted GCU according to the present invention.

[0042] Figure 5 This is a top view of the arrangement of the GCU air box and the temporary lifting base in the method for centering and installing the combustion chamber of a ship-mounted GCU according to the present invention.

[0043] Figure 6 This is a schematic diagram of the arrangement of the temporary lifting equipment when adjusting the GCU combustion chamber during the centering and installation of the ship's wall-mounted GCU combustion chamber in the method of the present invention.

[0044] The specific descriptions of the attached drawings are as follows: 1. Base foot; 2. Base foot plate; 3. Base foot bolt; 4. Temporary lifting base; 5. Lifting short pipe; 6. Lifting cylinder; 7. Radial adjustment cylinder. Detailed Implementation

[0045] To better understand the purpose, structure, and function of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0046] In the description of this invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the positional relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of the embodiments of this invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore should not be construed as a limitation of this invention.

[0047] This embodiment provides a method for centering and installing a ship-mounted GCU combustion chamber, and a ship, such as... Figure 2 As shown, the vessel includes an exhaust pipe A, a GCU combustion chamber B, and a GCU air box C, as... Figure 3As shown, the GCU combustion chamber B includes a base 1, a base support plate 2, and base bolts 3. The alignment and installation method includes the following steps:

[0048] S1, such as Figure 4 and Figure 5 As shown, the preset temporary lifting base 4:

[0049] In the circumferential direction, the installation positions of the four temporary lifting bases 4 are offset by 45° relative to the pre-installation positions of the four bases 1 of the GCU combustion chamber B; in the horizontal direction, the installation positions of the temporary lifting bases 4 are located directly below the strong structure that can be used for lifting on the GCU combustion chamber B to be installed; the strong structure is a structure with sufficient strength to support the entire GCU combustion chamber B without damaging the important components of the GCU combustion chamber B, and is used to ensure the stability and safety of the GCU combustion chamber B during the alignment installation process. The strength of a single temporary lifting base 4 should be able to withstand at least half the weight of the GCU combustion chamber B;

[0050] After the hull section where the GCU air box C is located is constructed, according to the installation position determined by the temporary lifting base 4, four steel plates for setting the temporary lifting base 4 are horizontally extended inward on the panel of the upper end face of the GCU air box C. The steel plate size can be 200mmX200mmX15mm. The lower end face of the steel plate is vertically connected to a triangular plate of the same thickness of 15mm to strengthen the support strength, so that the support strength can be guaranteed to bear at least half of the weight of the GCU combustion chamber B. The four temporary lifting bases are welded to the upper end face of the steel plate.

[0051] S2. Place temporary lifting equipment:

[0052] like Figure 2 As shown, the exhaust pipe A is hoisted to the upper end of the GCU air box C using conventional methods. After adjusting it to a suitable position, the exhaust pipe A is welded and fixed to the upper end of the GCU air box C.

[0053] like Figure 6 As shown, the upper end face of the temporary lifting base 4 is connected to the lower end face of the temporary lifting device. The temporary lifting device includes a lifting short pipe 5 and a lifting cylinder 6. The upper end face of the lifting short pipe 5 is connected to the lower end face of the lifting cylinder 6. The height of the temporary lifting device is adjusted to the pre-installation position of the GCU combustion chamber B by the plunger on the lifting cylinder 6. That is, the total height of the lifting short pipe 5 and the lifting cylinder 6 is equal to the distance from the upper end face of the GCU air box C to the lower end face of the strong structure of the GCU combustion chamber B after final installation. At the same time, a margin is reserved for the lifting cylinder 6 to be adjusted up and down. That is, the plunger in the lifting cylinder 6 is pushed out of the preset position to a certain extent, so that the upward stroke and downward stroke of the plunger are not less than 20mm.

[0054] S3. Hoisting the GCU combustion chamber B:

[0055] like Figure 2 As shown, loosen the anchor bolts 3 between the base 1 and the base support plate 2 of the GCU combustion chamber B in sequence, and retract the base 1 of the GCU combustion chamber B inward to its innermost position. This is to ensure that the base 1 will not interfere with the inner wall of the exhaust pipe A during hoisting, and also to facilitate the installation of the radial adjustment cylinder 7 in S4 to adjust the gap between the lower end side of the GCU combustion chamber B and the inner wall of the exhaust pipe A. Secure the base 1 and the base support plate 2 by tightening the anchor bolts 3. Figure 6 As shown, the GCU combustion chamber B is lifted by a crane and inserted into the exhaust pipe A. The position of the GCU combustion chamber B is adjusted and placed on the temporary lifting equipment according to the pre-installation position. At the same time, the height of the lifting cylinder 6 is finely adjusted so that the upper end face of the four lifting cylinders 6 is in contact with the lower end face of the strong structure of the GCU combustion chamber B.

[0056] S4, such as Figure 2 and Figure 6 As shown, adjust the GCU combustion chamber B and exhaust pipe A accordingly:

[0057] Measure the distances from the four feet 1 of the GCU combustion chamber B to the inner wall of the exhaust pipe A, and calculate the distance deviation between two opposite feet. Install a radial adjustment cylinder 7 at the foot with the smaller distance from the opposite feet 1 to the inner wall of the exhaust pipe A. The radial adjustment cylinder 7 is located between the inner wall of the exhaust pipe A and the feet 1 of the combustion chamber B. Adjust the horizontal position of the GCU combustion chamber B radially until the distance difference between the feet 1 at the adjustment point of the radial adjustment cylinder 7 and the inner wall of the exhaust pipe A, and the distance difference between the feet 1 at the opposite position and the inner wall of the exhaust pipe A, are both less than 1 mm. After adjustment, remove the radial adjustment cylinder 7. Repeat the adjustment operation for the other set of opposite feet 1 until the distance difference between all four feet 1 and the inner wall of the exhaust pipe A is less than 1 mm, thus completing the horizontal alignment adjustment of the four feet 1 of the GCU combustion chamber B at the bottom of the exhaust pipe A.

[0058] Four measuring points are selected on the upper end face of the GCU combustion chamber B. These four measuring points are located directly above the temporary lifting equipment in the vertical direction. The distances from these four measuring points to the inner wall of the exhaust pipe A are measured, and the distance deviation between any two relative measuring points is calculated. The height of the four lifting cylinders 6 is adjusted sequentially by the plungers on the lifting cylinders 6 to change the gap between the four measuring points on the upper end face of the GCU combustion chamber B and the exhaust pipe A. The lifting cylinder 6 located below the measuring point with the smaller distance from the inner wall of the exhaust pipe A among two relative measuring points can be selected for lifting. Alternatively, the lifting cylinder 6 can be lowered below the measuring point with the larger distance from the inner wall of exhaust pipe A among the two relative measuring points, so that the distance difference between all four measuring points and the inner wall of exhaust pipe A is less than 1mm, thus completing the centering adjustment of the four measuring points on the upper end face of GCU combustion chamber B in the horizontal direction of exhaust pipe A; when the gap deviation between the four base feet 1 of GCU combustion chamber B and the four measuring points on the upper end face of GCU combustion chamber B and the inner wall of exhaust pipe A does not exceed 1mm, maintain the position of GCU combustion chamber B, lock the position of lifting cylinder 6, and end the centering adjustment;

[0059] S5. Weld GCU combustion chamber B base 1 to exhaust pipe A:

[0060] like Figure 3 As shown, loosen the base bolts 3 between the base foot 1 and the base support plate 2 of the GCU combustion chamber B in sequence, move the base foot 1 outward until the base foot 1 contacts the inner wall of the exhaust pipe A, and then tighten the base bolts 3 again to weld and fix the four base feet 1 and the exhaust pipe A in sequence.

[0061] S6. Remove the temporary lifting base 4 and temporary lifting equipment:

[0062] After welding is completed, the temporary lifting equipment is released, and all temporary equipment and materials added to the GCU air box C are removed. These temporary equipment and materials include the temporary lifting base 4, the lifting short pipe 5, the lifting cylinder 6, the steel plate, and the triangular plate, so that the GCU air box C is returned to the final required state, which facilitates the completion of other finishing work required for the subsequent installation of the GCU combustion chamber B.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Those skilled in the art can make various changes or equivalent substitutions to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A method for centering and installing a wall-mounted GCU combustion chamber on a ship, the ship comprising an exhaust pipe, a GCU combustion chamber, and a GCU air box, the GCU combustion chamber comprising a base (1), a base support plate (2), and base bolts (3), characterized in that, Includes the following steps, S1. Pre-set temporary lifting base (4): Based on the pre-installation position of the GCU combustion chamber, determine the installation position of the temporary lifting base (4) and pre-set a temporary lifting base (4) that can bear half the weight of the GCU combustion chamber at the upper end of the GCU air box. S2. Place temporary lifting equipment, which includes a lifting short pipe (5) and a lifting cylinder (6): Place the lifting short pipe (5) and the lifting cylinder (6) from bottom to top on the upper surface of the temporary lifting base (4), adjust the height of the temporary lifting equipment to the pre-installation position of the GCU combustion chamber, and at the same time retain the stroke margin that the lifting cylinder (6) can adjust up and down. S3. Hoisting the GCU combustion chamber: The base (1) is retracted inward to the innermost position and fixed in sequence. The GCU combustion chamber is hoisted into the exhaust pipe. The position of the GCU combustion chamber is adjusted to the pre-installation position. At the same time, the height of the temporary lifting equipment is adjusted so that the upper end face of the lifting cylinder (6) is in contact with the lower end face of the GCU combustion chamber. S4. Centering and adjusting the GCU combustion chamber and exhaust pipe: Install a radial adjustment cylinder (7) between the inner wall of the exhaust pipe and the base (1). Adjust the gap between the base (1) and the exhaust pipe by adjusting the radial adjustment cylinder (7). Select a measuring point on the upper surface of the GCU combustion chamber that is directly above the temporary lifting device. Adjust the gap between the measuring point and the exhaust pipe by adjusting the height of the lifting cylinder (6). When the gap deviation between the base (1) and the inner wall of the exhaust pipe and the gap deviation between the measuring point and the inner wall of the exhaust pipe do not exceed 1mm, maintain the position of the GCU combustion chamber and end the centering adjustment. S5. Weld the foot (1) and the exhaust pipe: Loosen the foot bolts (3) between the foot (1) and the foot support plate (2) in sequence, move the foot (1) outward until the foot (1) contacts the inner wall of the exhaust pipe, and then weld the foot (1) and the exhaust pipe in sequence. S6. Remove the temporary lifting base (4) and temporary lifting equipment: After welding is completed, loosen the lifting equipment and remove all temporary equipment and materials added to the GCU air box. All temporary equipment and materials added include the temporary lifting base (4), the lifting short pipe (5) and the lifting cylinder (6).

2. The method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, wherein the GCU combustion chamber further includes a reinforcing structure for jacking, characterized in that, The pre-set temporary lifting base (4) in S1 includes the following specific steps: S1-1. Based on the pre-installation position of the GCU combustion chamber base (1), the pre-installation position of the base (1) is horizontally deflected by 45° as the installation position of the temporary lifting base (4) in the circumferential direction. S1-2. Based on the location of the strong structure of the GCU combustion chamber, the location directly below the location of the strong structure is taken as the installation position of the temporary lifting base (4) in the diameter direction. S1-3. Based on the installation position in the circumferential direction and the diameter direction determined by the temporary lifting base (4), a steel plate for setting the temporary lifting base (4) is set horizontally inward on the panel of the upper end face of the GCU air box. The lower end face of the steel plate is vertically connected to a triangular plate with the same thickness as the steel plate for strengthening the support strength, so that the support strength can bear half the weight of the GCU combustion chamber.

3. The method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, characterized in that, In the step S2 of placing the temporary lifting device The specific steps for adjusting the height of the temporary lifting equipment to the pre-installation position of the GCU combustion chamber include: adjusting the lifting cylinder (6) to make the total height of the lifting short pipe (5) and the lifting cylinder (6) equal to the distance from the upper end face of the GCU air box to the lower end face of the strong structure of the GCU combustion chamber after final installation. The specific steps for maintaining the adjustable stroke margin of the lifting cylinder (6) include: pushing the plunger on the lifting cylinder (6) out of the preset position to a certain extent, so that the upward stroke and downward stroke of the plunger are both not less than 20mm.

4. A method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, characterized in that, In the step of hoisting the GCU combustion chamber in S3, The specific steps for retracting the base (1) inward to its innermost position include: Loosen the foot bolts (3) between the foot (1) and the foot support plate (2) in sequence, retract the foot (1) inward to the innermost position where it will not contact the inner wall of the exhaust pipe, leave a gap between the foot (1) and the inner wall of the exhaust pipe for subsequent installation of the radial adjustment cylinder (7), and then tighten the foot bolts (3) in sequence to fix the foot (1); The specific steps for adjusting the height of the temporary lifting equipment include: by finely adjusting the height of the lifting cylinder (6), the upper end face of the lifting cylinder (6) is in contact with the lower end face of the strong structure of the GCU combustion chamber.

5. A method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, characterized in that, The alignment and adjustment of the GCU combustion chamber and exhaust pipe in S4 includes the following specific steps. S4-1. Measure the distance from the foot (1) to the inner wall of the exhaust pipe and calculate the distance deviation between the two opposite feet (1); S4-2. Install a radial adjustment cylinder (7) at the foot (1) with the smaller distance from the inner wall of the exhaust pipe among the two opposite foot (1). The radial adjustment cylinder (7) is located between the inner wall of the exhaust pipe and the foot (1). Adjust the horizontal position of the GCU combustion chamber radially by adjusting the radial adjustment cylinder (7) so that the distance difference between the foot (1) at the adjustment point of the radial adjustment cylinder (7) and the inner wall of the exhaust pipe and the distance difference between the foot (1) at the opposite position and the inner wall of the exhaust pipe are both less than 1mm. After the adjustment is completed, remove the radial adjustment cylinder (7). S4-3. Repeat the operation of S4-2 for the other set of opposite feet (1) until the distance difference between the feet (1) and the inner wall of the exhaust pipe is less than 1mm, and complete the centering adjustment of the feet (1) in the horizontal direction at the bottom of the exhaust pipe. S4-4. Select a measurement point on the upper end face of the GCU combustion chamber. The measurement point is located directly above the temporary lifting equipment in the vertical direction. Measure the distance from the measurement point to the inner wall of the exhaust pipe and calculate the distance deviation between the two relative measurement points. S4-5. The height of the lifting cylinder (6) is adjusted up and down sequentially by the plunger on the lifting cylinder (6) to change the gap between the measuring point and the exhaust pipe. The lifting cylinder (6) below the measuring point with the smaller distance from the inner wall of the exhaust pipe is lifted by lifting the two relative measuring points, or the lifting cylinder (6) below the measuring point with the larger distance from the inner wall of the exhaust pipe is lowered by lowering the two relative measuring points, so that the distance difference between the measuring point and the inner wall of the exhaust pipe is less than 1mm, and the centering adjustment of each measuring point on the upper end face of the GCU combustion chamber in the horizontal direction of the exhaust pipe is completed. S4-6. When the gap deviation between the base (1) and the inner wall of the exhaust pipe and the gap deviation between the measuring point and the inner wall of the exhaust pipe are both no more than 1mm, keep the position of the GCU combustion chamber, lock the lifting cylinder (6), and end the centering adjustment.

6. A method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, characterized in that, In the step of welding the base (1) and the exhaust pipe in S5, before welding and fixing the base (1) and the exhaust pipe, the position of the base (1) can be strengthened by tightening the base bolts (3) between the base (1) and the base support plate (2).

7. A method for centering and installing a shipboard-mounted GCU combustion chamber according to claim 1, characterized in that, In the step of removing the temporary lifting base (4) and temporary lifting equipment in S6, after removing all the temporarily added equipment and materials on the GCU air box, the GCU air box is restored to a state that facilitates the completion of other finishing work required for the subsequent installation of the GCU combustion chamber.

8. A ship with a wall-mounted GCU combustion chamber, characterized in that, It includes a wall-mounted GCU combustion chamber, which is installed on the hull according to the centering installation method described in any one of claims 1-7.

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