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Gas supply arrangement of a marine vessel and method of providing gas in a gas supply arrangement of a marine vessel

A gas supply and gas technology, which is applied in the method of container discharge, the purpose of gas treatment/storage, the installation device of container structure, etc. Effect

Inactive Publication Date: 2007-01-17
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of nitrogen reduces the performance of the engine and if the nitrogen content in the gas exceeds a certain level (eg 22%), the efficiency of the prime mover decreases

Method used

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  • Gas supply arrangement of a marine vessel and method of providing gas in a gas supply arrangement of a marine vessel

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Embodiment Construction

[0021] figure 1 A sectional view schematically shows a ship 6 such as an LNG tanker. The vessel 6 is adapted to carry liquefied gas in its cargo holds. Usually there are multiple cargo holds in tankers, but in figure 1 Only one cargo compartment 4 is shown in , for clarity. The cargo tank 4 is filled such that there is always an ullage space section 4.1 filled with gaseous gas and a liquid phase section 4.2 filled with liquefied gas. When storing the liquefied gas, the gas evaporates to change its state and is delivered to the ullage space section 4.1. The boil-off gas, so-called natural boil-off gas, can be used in the consumers 5 of the ship 6 . The consumer 5 is preferably a gas engine providing propulsion power. in the attached figure 1 In , only one consumer device 5 is shown, but it is clear that there may be a plurality of such devices.

[0022] In this embodiment, a ship 6 is provided with a gas supply arrangement 1 comprising a first gas supply line 2 and a sec...

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PUM

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Abstract

Gas supply arrangement (1) of a marine vessel (6) being adapted to carry liquefied gas in its cargo tank (4) having an ullage space section (4.1) and a liquid phase section (4.2), which arrangement utilises the gas as fuel to provide power for the vessel, the arrangement comprising a first gas supply line (2) provided for processing the natural boil-off gas formed in the cargo tank, a second gas supply line (3) which connects the cargo tank (4) and the gas main supply line (7) and which is provided with at least a pump (3.1) for raising the pressure of the liquid gas and for pumping it forward. The second gas supply line (3) is provided with a gas reservoir (3.2) having an ullage space section (3.3) and liquid phase section (3.7), and that the arrangement is provided with a first duct section (3.4) of the second gas supply line (3) connecting the liquid phase section of the cargo tank (4) and the liquid phase section of the gas reservoir (3.2), and being provided with the pump (3.1), and that the arrangement is additionally provided with a return line (3.14) connecting the liquid phase section of the reservoir (3.2) and the cargo tank (4) being provided with a control valve (3.15) for controllably returning liquid gas back into the cargo tank (4).

Description

technical field [0001] The invention relates to a gas supply arrangement for a ship according to the preamble of claim 1 and to a method for controlling the air pressure in a ship's gas supply arrangement according to the preamble of claim 8 Background technique [0002] Propulsion systems with LNG (liquefied natural gas) tankers are usually powered by cargo. The gas stored in the tanker is configured by using an insulated tank in which an ullage space section and a liquid phase section are formed. The pressure in the tanker is approximately at atmospheric pressure, and the temperature of the liquefied gas is approximately minus 163°C. Although the tanker is extremely well insulated, the gradually increasing LNG temperature leads to the formation of so-called natural boil-off gas. Natural boil-off gas must be removed to avoid excessive pressure build-up in tankers. Natural boil-off gas can be utilized, for example, in tanker consumers for propulsion systems. However, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63J5/00B63H21/02F17C9/02B63J99/00F17C1/00F17C7/00
CPCF17C2250/075F17C2250/0439F17C2227/0185F17C7/00F17C2227/039F17C2225/0153F17C2270/0105B63J99/00F17C2227/0339F17C2203/03F17C2265/037F17C2250/0404F17C2201/052F17C2201/054F17C2223/0161F17C2250/0636F17C2250/0631F17C2223/033F17C2250/043F17C2265/066F17C2250/072F17C2221/033F17C2227/0304F17C2227/0309F17C2260/02F17C2225/0123B63J2099/003F17C2225/047F17C2223/047F17C2250/0491F17C2205/0335F17C2227/0157F17C2250/01F17C1/002F17C2265/015F17C2225/033F17C2250/0443F17C2250/0626F17C2205/0323F17C2250/0452F17C2227/0142F17C2250/077Y02T70/5263F17C2250/0408F17C2260/026F17C2223/043F17C2225/013F17C2227/0178Y02T70/5218F17C2227/0306F17C2250/032Y02T70/50B63B25/14
Inventor S·卡斯森T·马兰恩
Owner WARTSILA FINLAND OY
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