CN-116788464-B - Method for centering installation of ship wall-mounted GCU combustion cavity and ship

CN116788464BCN 116788464 BCN116788464 BCN 116788464BCN-116788464-B

Abstract

The invention discloses a method for centering and installing a ship wall-mounted GCU combustion cavity and a ship, and belongs to the field of ship construction. The method of the invention realizes the centering installation of the ship wall-hanging GCU combustion cavity by six steps of presetting a temporary jacking base, placing temporary jacking equipment, hoisting the GCU combustion cavity, centering and adjusting the GCU combustion cavity and an exhaust pipe, welding equipment feet and the exhaust pipe, and dismantling the temporary jacking base and the jacking equipment. The method of the invention has the advantages of saving operation cost, improving operation efficiency without additional hoisting facilities, being convenient and simple to use, easy to adjust, improving centering adjustment quality and efficiency, shortening construction period, being wide in application range, being applicable to all ships using wall-mounted GCU, not needing to add any new equipment and facilities, not increasing realization cost, being strong in adaptability and meeting production requirements.

Inventors

LU SHUWEN
XIANG TAO
ZHANG CHENJUN

Assignees

沪东中华造船(集团)有限公司

Dates

Publication Date: 20260505
Application Date: 20230626

Claims (8)

1. A method for centering installation of a wall-mounted GCU combustion chamber of a vessel, said vessel comprising an exhaust pipe, a GCU combustion chamber and a GCU bellows, said GCU combustion chamber comprising feet (1), foot brackets (2) and foot bolts (3), characterized by comprising the steps of, S1, presetting a temporary jacking base (4), namely determining the installation position of the temporary jacking base (4) according to the preliminary installation position of a GCU combustion chamber, and presetting the temporary jacking base (4) capable of bearing half weight of the GCU combustion chamber at the upper end face of a GCU bellows; S2, placing temporary jacking equipment, wherein the temporary jacking equipment comprises a jacking short pipe (5) and a jacking oil cylinder (6), wherein the jacking short pipe (5) and the jacking oil cylinder (6) are placed on the upper end face of the temporary jacking base (4) from bottom to top, the height of the temporary jacking equipment is adjusted to a preliminary installation position of a GCU combustion cavity, and meanwhile, the stroke allowance of the jacking oil cylinder (6) which can be adjusted up and down is reserved; S3, hoisting the GCU combustion chamber, namely sequentially inwards shrinking the footing (1) to the innermost position and fixing the footing, hoisting the GCU combustion chamber to penetrate into the exhaust pipe, adjusting the position of the GCU combustion chamber to a preparation installation position, and simultaneously adjusting the height of temporary jacking equipment to ensure that the upper end face of the jacking oil cylinder (6) is contacted with the lower end face of the GCU combustion chamber; S4, centering adjustment of the GCU combustion chamber and the exhaust pipe, namely erecting a radial adjustment cylinder (7) between the inner wall of the exhaust pipe and the bottom leg (1), adjusting the gap between the bottom leg (1) and the exhaust pipe by adjusting the radial adjustment cylinder (7), selecting a measuring point positioned vertically above temporary jacking equipment on the upper end surface of the GCU combustion chamber, adjusting the gap between the measuring point and the exhaust pipe by adjusting the height of the jacking cylinder (6), and keeping the position of the GCU combustion chamber and ending centering adjustment when the gap deviation between the bottom leg (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 not more than 1 mm; s5, welding the bottom feet (1) and the exhaust pipe, namely loosening the bottom foot bolts (3) between the bottom feet (1) and the bottom foot supporting plates (2) in sequence, moving the bottom feet (1) outwards until the bottom feet (1) are in contact with the inner wall of the exhaust pipe, and then welding and fixing the bottom feet (1) and the exhaust pipe in sequence; S6, removing the temporary jacking base (4) and the temporary jacking equipment, namely loosening the jacking equipment after welding is finished, and removing all temporarily added equipment and materials on the GCU bellows, wherein all temporarily added equipment and materials comprise the temporary jacking base (4), the jacking short pipe (5) and the jacking oil cylinder (6).
2. The method for centering installation of a wall-mounted GCU combustion chamber for a ship according to claim 1, wherein the GCU combustion chamber further comprises a strong structure for jacking, characterized in that the pre-setting of the temporary jacking base (4) in S1 comprises the specific steps of, S1-1, horizontally deflecting the preliminary installation position of the footing (1) by 45 degrees according to the preliminary installation position of the footing (1) of the GCU combustion chamber to serve as the installation position of the temporary jacking base (4) in the circumferential direction; S1-2, taking the position right below the strong structure position as the installation position of the temporary jacking base (4) in the diameter direction according to the strong structure position of the GCU combustion cavity; s1-3, according to the installation positions of the temporary jacking base (4) in the circumferential direction and in the diameter direction, a steel plate for setting the temporary jacking base (4) is horizontally and inwards extended and arranged on a panel of the upper end face of the GCU bellows, and a triangular plate with the same thickness as the steel plate and used for reinforcing the supporting strength is vertically connected to the lower end face of the steel plate, so that the supporting strength can bear half of the weight of the GCU combustion chamber.
3. A method for centering a combustion chamber of a marine vessel wall-mounted GCU according to claim 1, wherein said step of S2 positioning a temporary jacking device, The specific step of adjusting the height of the temporary jacking equipment to the preliminary installation position of the GCU combustion chamber comprises the following steps of adjusting the total height of a jacking short pipe (5) and the jacking oil cylinder (6) to be equal to the distance from the upper end face of the finally installed GCU bellows to the lower end face of the strong structure of the GCU combustion chamber through adjusting the jacking oil cylinder (6); the specific step of reserving the stroke allowance of the jacking cylinder (6) capable of being adjusted up and down comprises the step of pushing out a plunger on the jacking cylinder (6) from a preset position to a certain extent, so that the upward stroke and the downward stroke of the plunger are not smaller than 20mm.
4. A method for centering a combustion chamber of a marine vessel wall-mounted GCU according to claim 1, wherein in said step of hoisting the GCU combustion chamber in S3, The specific step of shrinking the foot (1) inwards to the innermost position comprises: Sequentially loosening the footing bolts (3) between the footing (1) and the footing supporting plate (2), inwards shrinking the footing (1) to the innermost position which is not contacted with the inner wall of the exhaust pipe, leaving a gap between the footing (1) and the inner wall of the exhaust pipe, which can be used for subsequently erecting a radial adjusting oil cylinder (7), and sequentially fastening the footing bolts (3) to fix the footing (1); The specific step of adjusting the height of the temporary jacking equipment comprises the step of enabling the upper end surfaces of the jacking oil cylinders (6) to be in contact with the lower end surface of the GCU combustion cavity strong structure through fine adjustment of the height of the jacking oil cylinders (6).
5. A method for centering installation of a wall-mounted GCU combustion chamber of a marine vessel according to claim 1, wherein said centering adjustment of S4 of the GCU combustion chamber and the exhaust pipe comprises the specific steps of, S4-1, measuring the distance between the bottom feet (1) and the inner wall of the exhaust pipe, and calculating the distance deviation of the two opposite bottom feet (1); S4-2, erecting radial adjustment oil cylinders (7) at the positions of the feet (1) with small distance from the two opposite feet (1) to the inner wall of the exhaust pipe, wherein the radial adjustment oil cylinders (7) are positioned between the inner wall of the exhaust pipe and the feet (1), and the horizontal position of a GCU combustion cavity is radially adjusted through the radial adjustment oil cylinders (7), so that the distance difference between the feet (1) positioned at the adjustment positions of the radial adjustment oil cylinders (7) and the inner wall of the exhaust pipe and the distance difference between the feet (1) positioned at the opposite positions and the inner wall of the exhaust pipe are smaller than 1mm, and after the adjustment is completed, the radial adjustment oil cylinders (7) are detached; S4-3, repeating the operation of S4-2 on the other group 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 finishing the centering adjustment of the feet (1) on the horizontal direction of the bottom of the exhaust pipe; S4-4, selecting a measuring point on the upper end surface of the GCU combustion chamber, wherein the measuring point is positioned right above the erection position of the temporary jacking equipment in the vertical direction, measuring the distance between the measuring point and the inner wall of the exhaust pipe, and calculating the distance deviation between the two opposite measuring points; S4-5, sequentially adjusting the height of the jacking oil cylinder (6) up and down through a plunger on the jacking oil cylinder (6) to change the gap between the measuring points and the exhaust pipe, and lifting the jacking oil cylinder (6) positioned below a measuring point with small distance from the inner wall of the exhaust pipe in two opposite measuring points, or lowering the jacking oil cylinder (6) positioned below a measuring point with large distance from the inner wall of the exhaust pipe in two opposite measuring points to the measuring point, so that the distance difference between the measuring points and the inner wall of the exhaust pipe is smaller than 1mm, and finishing the centering adjustment of each measuring point on the upper end surface of the GCU combustion chamber in the horizontal direction of the exhaust pipe; And S4-6, when the gap deviation between the bottom foot (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 not more than 1mm, the position of the GCU combustion chamber is maintained, the jacking cylinder (6) is locked, and the centering adjustment is finished.
6. A method for centering installation of a wall-mounted GCU combustion chamber for a vessel according to claim 1, characterized in that in the step of S5 welding the foot (1) to the exhaust pipe, the position of the foot (1) can be strengthened by tightening the foot bolt (3) between the foot (1) and the foot support plate (2) before the step of welding the foot (1) to the exhaust pipe.
7. The method for centering installation of the wall-hanging GCU combustion chamber of the ship according to claim 1, wherein in the step of removing the temporary lifting base (4) and the temporary lifting equipment in S6, after removing all the temporarily added equipment and materials on the GCU bellows, the GCU bellows is returned to a state that is convenient for completing other ending work required in the subsequent installation of the GCU combustion chamber.
8. A vessel having a wall-mounted GCU combustion chamber, comprising a wall-mounted GCU combustion chamber mounted on a hull according to the centering installation method of any of claims 1-7.

Description

Method for centering installation of ship wall-mounted GCU combustion cavity and ship Technical Field The invention relates to the installation of GCU in the field of ship manufacturing, in particular to a method for centering installation of a ship wall-mounted GCU combustion cavity and a ship. Background The gas combustion unit (gas combustion unit, hereinafter referred to as GCU) is an important system on a ship, and is mainly applied to LNG ships or other ships using natural gas as fuel, and is used for burning redundant natural gas volatilized from the ship or impure natural gas replaced by a cargo hold so as to avoid pollution caused by direct discharge of natural gas to the atmosphere, thereby further exacerbating the greenhouse effect. Since GCU is required to meet the requirement of instantaneously burning a large amount of natural gas, it releases a large amount of heat when in use, and thus the centering installation accuracy of its combustion chamber and exhaust pipe needs to be strictly controlled to meet the requirement of thermal expansion. In actual production, the GCU is mainly SAACKE and ALFA LAVAL, and the GCU produced by the manufacturers is generally installed in a floor type mode, and the GCU can be adjusted and installed after equipment is hoisted in place. However, in recent years, along with continuous cost optimization by equipment manufacturers, ALFA LAVAL has proposed a wall-mounted GCU. The GCU has four feet in the vertical direction for welding to the inner wall of the exhaust pipe provided by the shipyard. The four footings can stretch out and draw back along the diameter direction, shrink inwards when hoisting, outwards extend to the exhaust pipe inner wall after finishing the adjustment again, fix the footing bolt and with footing and exhaust pipe welded fastening. Aiming at the combustion chamber centering installation of the wall-mounted GCU, the currently used methods mainly comprise the following steps: The first is to use crane adjustment during hoisting, hang four hoists below the crane and connect to four hoisting measuring points at the top of the GCU combustion chamber, keep the crane motionless after the crane primarily hoisted GCU in place, adjust four hoists to center the GCU with the exhaust pipe, then extend and fix the footing and weld. The method occupies more crane resources, and simultaneously, the centering state of the GCU combustion chamber and the exhaust pipe is difficult to measure in the state, so that the construction difficulty is high; and the second is to install four hoists or other tools at the top of the exhaust pipe and at the four hanging measurement points of the GCU combustion chamber to adjust the alignment of the GCU and the exhaust pipe, and then to extend and fix the feet and weld. The method needs to utilize a hoist or other tools to adjust equipment weighing tens of tons, is very time-consuming and labor-consuming, and has higher construction difficulty; Thirdly, four baffles are welded at corresponding positions of the GCU exhaust pipe to fix the four feet, and then subsequent centering adjustment is performed. The method uses the footing to bear the force, so that the radial movement of the footing is very difficult, and the height adjustment of the footing is difficult to realize, so that the scheme also has great construction difficulty; In summary, in the existing centering installation process of the ship wall-mounted GCU combustion chamber, the problems of high construction difficulty, time and labor waste, difficulty in centering adjustment and the like exist, and a simple, quick and effective method for realizing centering work of the GCU combustion chamber and the exhaust pipe is lacked. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide a method for centering and installing a combustion chamber of a wall-mounted GCU of a ship and the ship, and the method does not relate to any new equipment and facilities, can reduce construction difficulty, shorten construction period, improve construction quality and is applicable to all ships using the wall-mounted GCU. To achieve the above and other related objects, the present invention adopts the following technical solutions: In a first aspect of the invention, there is provided a method for centering a wall-mounted GCU combustion chamber of a vessel, said vessel comprising an exhaust pipe, a GCU combustion chamber and a GCU bellows, said GCU combustion chamber comprising feet, foot brackets and foot bolts, said centering method comprising the steps of, S1, presetting a temporary jacking base, namely determining the installation position of the temporary jacking base according to the preliminary installation position of a GCU combustion chamber, and presetting the temporary jacking base capable of bearing half of the weight of the GCU combustion chamber at the upper end face of a GCU bellows; S2, placing temporary jacking equipment