Double-wall pipeline for the connection of fuel-gas valve set and engine on LNG ship and installation method of double-wall pipeline

A technology for LNG ships and dual-fuel engines, which is applied to combustion engines, internal combustion piston engines, engine components, etc., can solve the problems of inability to meet the requirements of design pressure, unsatisfactory effects, and complex structures, and achieves simple and practical structure. Easy, common material effect

CN101525048BActive Publication Date: 2012-05-30HUDONG ZHONGHUA SHIPBUILDINGGROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-05-30

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Abstract

The invention relates to a double-wall pipeline for the connection of a fuel-gas valve set and an engine on an LNG ship, which comprises an internal pipe and an external pipe, wherein the internal pipe and the external pipe are coaxially sleeved and supported by a plurality of detachable clips, one end of the external pipe is fixed on the side wall of a fuel-gas valve set chamber provided with the fuel-gas valve set, one end of the internal pipe is communicated with the fuel-gas valve set by a transitional connection pipe, the other end of the internal pipe is communicated with the air inlet of a double fuel-gas engine by an internal corrugated pipe, the aperture of the internal pipe is the same as that of the air inlet of the engine, and a circular chamber is arranged between the internal pipe and the external pipe and communicated with the fuel-gas valve chamber to together realize air change. The double-wall pipe of the invention has simple and practical structure, uses common material of easy production and low cost, and can be rapidly and conveniently assembled and disassemble by using common tools when being applied on the LNG ship.
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Description

technical field

[0001] The invention relates to a liquefied natural gas ship, in particular to a double-wall pipeline connecting a gas valve group and a dual-fuel engine on an LNG ship and an installation method for the double-wall pipeline. Background technique

[0002] LNG (liquefied natural gas) is a highly efficient and clean energy that is increasingly widely used. LNG carriers and LNG platform work ships have achieved rapid development. The advent of dual-fuel engines has enabled new power systems to appear on LNG carriers and platform workboats. The dual-fuel engine can use natural gas, and the natural gas supply pressure is required to be about 0.5MPa, which is much higher than the gas supply pressure (0.1MPa) of the dual-fuel boiler. Since natural gas is a flammable and explosive gas, and the dual-fuel engine and its auxiliary systems inevitably require more electronic control systems and power supply systems, it is necessary to use double-walled pipes for gas supp...

Examples

Embodiment

[0041] The double-wall pipe design scheme applied to the 160,000 cubic meters electric propulsion LNG ship under research and development.

[0042] First, double wall tube structure:

[0043] ① The inner pipe is made of Φ114x6 ordinary steel pipe, the length of the No. 1 inner pipe is 2500mm, the length of the No. 2 inner pipe is 2200mm, and the standard flanges of 10100 GB2506-89 are used at both ends;

[0044] ② The outer pipe is made of Φ325x8 ordinary steel pipe, the second outer pipe is 1250mm long, the first outer pipe is a combined structure, and there are upper and lower branch pipes of DN300 diameter on it, and 10300GB2506-89 standard flanges are used at both ends;

[0045] ③ The two ends of the upper and lower branch pipes adopt the standard flange of 10300 GB2506-89, and the end cover adopts the standard blind flange of this series;

[0046] ④The inner bellows adopts the specification of DN100PN10, and the outer bellows adopts the specification of DN300PN10;

[00...