Propulsion device of liquefied natural gas carrier, liquefied natural gas carrier, power supply device of offshore plant, and offshore plant comprising the power supply device

Abstract

The present invention relates to a propulsion device of a liquefied natural gas carrier and a power supply device of an offshore plant, the propulsion device of a liquefied natural gas carrier enabling a dual fuel oil electric generator to operate in a gas mode even when fast acceleration and deceleration is necessary, and the power supply device of an offshore plant enabling a dual fuel oil electric generator to operate in a gas mode even when there is a sudden change in the power consumption of drilling equipment and a thruster motor. Provided is a propulsion device of a liquefied natural gas carrier, the propulsion device, according to one embodiment of the present invention, comprising: a dual fuel oil electric generator which uses gas as fuel in a gas mode and uses oil as fuel in an oil mode; a variable frequency converter which receives power from the dual fuel oil electric generator and supplies the power to a main propulsion motor; the main propulsion motor which is connected to the variable frequency converter and rotates a propeller by receiving the power from the variable frequency converter; and a power storage unit which is connected to the variable frequency converter and supplies power to the main propulsion motor if the amount of increase in the power consumption of the main propulsion motor is greater than or equal to a first threshold value.

Description

Technical field [0001] The present invention relates to a propulsion device of a liquefied natural gas carrier, and in particular to a propulsion device of a LNG carrier that can operate a dual-fuel oil generator in a gas mode even when rapid acceleration and deceleration are required. [0002] In addition, the present invention relates to a power supply device for marine equipment and marine equipment including the power supply device, and more particularly to a power supply device for marine equipment that can operate dual-fuel oil generators in gas mode even when the power consumption of drilling equipment and propulsion motors changes sharply . Background technique [0003] Natural gas is a fossil fuel mainly composed of methane and containing small amounts of ethane, propane, etc., and has recently attracted attention as a low-polluting energy source in various technical fields. In particular, since liquefied natural gas (LNG) is cheaper and causes less pollution, LNG is suit...

AI Technical Summary

Problems solved by technology

[0015] Therefore, in the case of mooring at a port or reversing at full speed, etc. that require rapid acceleration or deceleration, the dual fuel oil generator cannot be operated in gas mode, and forcibly operating the dual fuel oil generator in gas mode may cause damage to the engine or due to The frequency of the main power supply is unstable causing a blackout on board

[0016] Therefore, the problem with the prior art is that the dual fuel oil generator cannot be operated in gas mode when rapid acceleration or deceleration of the ship is required

[0042] When the unwinding / pull-up action of the winch is fast, a larger load will be required within 2 to 5 seconds, and the large load required by the winch cannot be provided in this time period in oil mode, so when forced to run in gas mode When the engine is damaged, the frequency of the main power may be unstable, resulting in a power outage, and the power outage during the drilling process may also cause the explosion of the well

[0043] That is, in the prior art, there are the following problems: when the power consumption of the drilling equipment changes rapidly, the dual-fuel oil generator cannot be operated in the gas mode; since the regenerative power is consumed by the resistance, there is a waste of resources; Fuel consumption and exhaust gas increase due to drastic changes in power; generators cannot provide proper power to winch motors, top drive motors, propeller motors; and the possibility of dangerous situations due to sudden power outages

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