Ship gas engine double-wall pipe

Abstract

The invention belongs to the technical field of gas engines, and relates to a ship gas engine double-wall pipe. The provided ship gas engine double-wall pipe is provided with a straight-pipe-shaped main air inlet pipe. The main air inlet pipe is provided with a main air inlet pipe inner pipe and a main air inlet pipe outer pipe which are coaxially arranged, and an annular cavity is formed between the main air inlet pipe inner pipe and the main air inlet pipe outer pipe. The main air inlet pipe is provided with a plurality of sets of air inlet branch pipes. Two air inlet branch pipes are arranged in each set of air inlet branch pipes. Each air inlet branch pipe is composed of an air inlet branch pipe outer pipe and an air inlet branch pipe inner pipe which are coaxially arranged. The upper ends of the air inlet branch pipe inner pipes and the air inlet branch pipe inner pipes are welded to the lower portions of the main air inlet pipe outer pipe and the main air inlet pipe inner pipe, and the lower ends of the air inlet branch pipe outer pipes and the air inlet branch pipe inner pipes are welded to connecting flanges. Annular cavities between the air inlet branch pipe outer pipes and the air inlet branch pipe inner pipes communicate with the annular cavity between the main air inlet pipe inner pipe and the main air inlet pipe outer pipe. According to the ship gas engine double-wall pipe, the purpose of direct supply of natural gas to cylinders is achieved, and it is ensured that natural gas does not leak on an engine gas supply pipeline.

Description

[0001] Technology area [0002] The invention belongs to the technical field of gas engines, and relates to a double-wall pipe for a marine gas engine. Background technique [0003] Since my country joined the MARPOL 73 / 78 Convention, the maritime sector has put forward stricter requirements on ship emissions; LNG, as a clean energy, is reducing costs and emissions, especially NO X , SO X In recent years, the application of gas engines in the field of ships has been further developed. The double-wall pipes used in gas engines must not only ensure that there is no gas leakage in the engine room, but also need to monitor the gas pressure on-line to accurately control the gas injection volume. On-line leak detection function, and the double-wall pipe is installed on the engine body. In addition to supplying gas to each cylinder of the engine, a special flange needs to be installed to connect with the outside world to meet the supply of gas and protective gas. However, existing ...

AI Technical Summary

Problems solved by technology

However, the existing double-wall pipes cannot meet this requirement.

[0004] In the prior art, patent 201610068172.1 discloses a double-walled pipe with a straight-through pipe structure. The inner pipe and the outer pipe are fixed by evenly distributed support plates. One end of the support plate is welded to the inner pipe, and the other end is connected to a Teflon pad Connection; the inner tube and the outer tube of the double-walled tube described in patent CN205278599U are supported by a rolling support. The structural support is complicated, and it is also a straight-through tube structure

This structure can only be used for the gas transmission of the ship's main gas pipeline, and cannot be installed on the engine body to provide gas to each cylinder, and lacks special connectors, which cannot meet the requirements of engine gas pipeline protection gas filling and ventilation

In addition, the double-wall pipe structure described in the above patent does not have the functions of online monitoring of gas pressure and online leak detection of the engine gas pipeline, which cannot meet the precise control of gas volume

Since the support is installed between the inner and outer pipes, the flow area of ​​the annular cavity is reduced, the flow resistance is increased, which is not conducive to purging, resulting in residual gas leakage in the annular cavity, which increases the risk of explosion

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