A method for digging and replacing the one-piece gas bag of the condenser shell

Abstract

The invention discloses a method for excavating and repairing a conjoined air bag of a condenser shell, which comprises the following steps: using an electric grinding wheel to cut an incision on the outer edge of the damaged air bag of a conjoined air bag, and removing a fire-resistant and flame-retardant material from the cut Insert it into the condenser shell to cover the copper tube inside the shell, and use a wind cutter to gradually cut off the damaged conjoined air bag from the incision; polish the incision of the condenser shell where the conjoined air bag has been cut off; make new air package, and weld the new air bag to the position where the original conjoined air bag of the condenser was cut; make a fastening belt and drill a through hole on the fastening belt, roll the fastening belt and assemble it outside the air bag of the new air bag Make a plunger matching the size of the through hole, and weld the plunger to the through hole; perform a sealing performance test on the condenser. The method for digging, replacing and repairing the conjoined gas bag of the present invention can carry out digging, replacing, welding and repairing the conjoined gas bag of the condenser shell, so that the boiler condenser can be used repeatedly, and the service life of the condenser is prolonged.

Description

technical field [0001] The invention relates to the technical field of excavation, replacement and repair, and in particular to a method for excavation, replacement and repair of a connected air bag of a condenser shell. Background technique [0002] The condenser of the ship boiler is divided into an atmospheric condenser and a boiler condenser. The atmospheric condenser uses the steam collected from the boiler to heat the fuel oil, the heating pipe in the oil tank, and the use of steam to supply the operation of the steam engine turbine and other equipment and facilities. The boiler condenser is to use the steam of the boiler to heat the water for the crew's domestic water and for the warm cylinder when the main engine starts. [0003] Please also see figure 1 with figure 2 ,in figure 1 It is a schematic diagram of the structure of the boiler condenser described in an embodiment of the present invention before it is repaired; figure 2 yes figure 1 A cross-sectional ...

AI Technical Summary

Problems solved by technology

With the prolongation of the use time of the boiler condenser, the one-piece gas bag 2 will be rotted continuously under the influence of humid steam. If it is a local small area of ​​rot, it can be repaired by repair welding or double plate, and it is easy to be damaged during repair welding. The thin-walled copper pipe 7 in the air cavity causes water leakage in the water cavity, so when the conjoined gas bag 2 is rotted in a large area, it is difficult to repair it by the above method, and the boiler condenser needs to be replaced as a whole, including the shell 1, The one-piece gas bag 2 and the internal copper tubes are replaced as a whole. If the copper tubes inside the condenser are intact, the overall replacement will cause a waste of resources, and the long replacement and maintenance period will affect the ignition of the boiler, thereby affecting The commissioning of various equipment and facilities will increase the cost of ship repairs and bring economic pressure to ship owners

In addition, whether it is a one-piece gas bag repaired by repair welding or a whole-replaced one-piece gas bag, after long-term use, the bottom of the one-piece gas bag will accumulate water formed by steam, which will accelerate the decay of the one-piece gas bag and cause damage. Affect the service life of the condenser

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