KR20180017568A - Hybrid generation and propulsion system and method for a vessel - Google Patents

Abstract

The present invention relates to a hybrid power generation and propulsion system of a ship, and a hybrid power generation and propulsion method of a ship. The present invention operates a propellant by receiving electric power through a battery in the sea area where an environmental pollution regulation is applied. Therefore, the present invention can achieve a zero emission amount of a pollutant. According to one aspect of the present invention, the hybrid power generation and propulsion system of a ship, which satisfies an amount of the electric power required by an electric power demand source installed inside a ship while operating the propellant of the ship to propel the ship, comprises: a battery installed in the ship to store the electric power received from the land; an engine using natural gas as a fuel and operating the propellant; and a motor receiving the electric power from the battery in an environmentally regulated region to operate the propellant.

Description

TECHNICAL FIELD [0001] The present invention relates to a hybrid power generation and propulsion system for a ship,

The present invention relates to a ship propulsion system and method, including a propulsion engine installed in a hull for power generation and propulsion in the ship.

Until now, propulsion engines that use oil as a fuel have been mainly used for commercial vessels such as container carriers, or passenger ships. However, liquefied fuel gas, which is much cheaper than petroleum due to environmental pollution regulations and rising oil prices, For example, ships equipped with propulsion engines using LNG (or LPG, DME, etc.) as fuel are on the increase. In addition, since the price of LNG in summer is about 50% lower than that in winter, LNG can be bought and stored in a low price summer, which is a very favorable energy source in terms of price.

In general, among the waste gases emitted from vessels, those regulated by the International Maritime Organization are nitrogen oxides (NOx) and sulfur oxides (SOx), and in recent years they have also been trying to regulate the emission of carbon dioxide (CO ₂ ) have. Particularly, in the case of nitrogen oxide (NOx) and sulfur oxide (SOx), it was raised through the Protocol of Maritime Pollution Prevention Convention (MARPOL) in 1997, It is being implemented as a compulsory regulation.

Examples of marine engines for propulsion or power generation using LNG (or LPG, DME, etc.) as fuel include MEGI engines or DF engines (used in dual fuel diesel electric systems). The MEGI engine or the DF engine compresses the LNG (or LPG, DME, etc.), and injects and burns it, which is called a gas injection engine. In particular, the MEGI engine is a high-pressure gas injection engine that compresses fuel to high pressure (150 to 400 bar) and then injects and burns it.

The MEGI engine is a ship such as an LNG carrier that stores and transports LNG in a cryogenic storage tank (in this specification, a vessel is a concept including LNG carrier, LNG FPSO, and LNG FSRU). As shown in FIG. The MEGI engine uses fuel gas such as natural gas as fuel together with fuel oil such as MDO and HFO. Depending on the load, a high-pressure fuel supply pressure of about 150-400 bara (absolute pressure) is required for the engine do.

The MEGI engine, which is mainly used as a propulsion engine, can be used directly for the propeller for propulsion. To this end, the MEGI engine consists of a two-stroke engine rotating at low speed. That is, the MEGI engine is a low-speed two-stroke high-pressure natural gas injection engine.

The MEGI engine can be operated at low output (for example, 30% or less of the maximum output) while using fuel (for example, HFO, MDO, etc.) and fuel gas (for example, LNG, LPG, DME, (For example, 30% or more of the maximum output) is required, the fuel oil and the fuel gas are supplied to the engine together to obtain an output, . A method of operating the MEGI engine as such a high-pressure natural gas injection engine is disclosed in Japanese Patent Registration No. 0396471.

In addition, the DF engine, which is used for propulsion or power generation, is an engine that can mix fuel oil and fuel gas, or use only one selected from fuel oil and fuel gas as fuel.

The DF engine does not need to supply the fuel gas at a high pressure such as the MEGI engine. The DF engine can be supplied with the fuel compressed to about several to several tens of bara. For example, the DF engine can be used in a dual fuel diesel electric (DFDE) system. According to the DFDE system, the generator is driven by the driving force of the DF engine to obtain electric power, and the electric power is used to drive the propulsion motor or to operate various devices or equipments.

As mentioned above, since the pollutants are discharged from the engine installed for the development and the propulsion of the ship, it is necessary to minimize the pollutant discharge due to the fuel flow, since the sea area adjacent to the port is the sea to which the environmental pollution control is applied.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a hybrid power generation and propulsion system capable of achieving zero emission of pollutants by driving a propellant, And to provide a vessel having such a structure.

According to an aspect of the present invention, there is provided a hybrid power generation and propulsion system for a ship to propel a propulsion body of a ship while satisfying an amount of power required by a power consumer installed in the ship, A battery for storing electric power supplied from the land; A propulsion engine that uses natural gas as fuel and drives the propellant; And a motor for driving the propellant by receiving power from the battery in an environmentally regulated area.

The ship is provided with a power conversion device including a transformer and a power converter, and the power supplied from the land can be supplied to the battery via the power conversion device.

The battery may be supplied with the onshore power through a power conversion device installed on the land.

The motor may be a combined motor generator.

And a generator connected to the power generation engine may be electrically connected to the BUS or may be connected to the battery through a converter that converts the power into charging power to the battery .

Wherein the engine is connected to the motor through a gear box and is connected to the generator through the gear box, and the generator is connected directly to the BUS, or through a converter for converting charging power into the battery, Lt; / RTI >

An inverter is disposed between the battery and the motor, and the inverter can control a speed of the motor by changing a frequency of power supplied from the battery.

The propulsion engine and the power generation engine may all be MEGI engines.

The propulsion engine and the power generation engine may be stopped and the electric power of the battery may be supplied to the onshore target while the ship is loaded or unloaded.

A clutch can be installed between the propulsion engine and the gearbox, between the gearbox and the propellant, between the gearbox and the generator, and between the gearbox and the motor to enable transmission and release of power, respectively have.

According to another aspect of the present invention, there is provided a navigation method for a ship for propelling a ship by satisfying an amount of electric power required by a power consumer installed in the ship and driving a propulsion body of the ship, There is provided a navigation method of a ship in which the propellant is driven by a propulsion engine using natural gas as a fuel and the propellant is driven by a motor supplied with power from the battery when a sea area to which environmental pollution control is applied is provided do.

According to the operation method of the ship, the propulsion engine is driven by the propulsion engine during constant speed operation of the ship, and power is transmitted to the generator connected to the propulsion engine through the gear box with an extra output of the propulsion engine And the electric power produced by the generator can be supplied to the electric power consumer through the BUS or charged through the converter.

According to the operation method of the ship, when the propulsion engine and the power generation engine are simultaneously operated in operation of a sea to which the environmental pollution control is applied, the propulsion power driven by the propulsion engine is gradually The motor can be driven by the motor supplied with the power of the battery, and the battery can be charged through the power generated from the generator connected to the power generation engine.

According to the operation method of the ship, when the propulsion engine is stopped and the power generation engine is operated during operation of the sea area to which the environmental pollution control is applied, the propulsion body is driven by the motor supplied with the power of the battery , The battery can be charged through electric power generated from a generator connected to the power generation engine.

According to the operation method of the ship, it is possible to stop the propulsion engine and the power generation engine while loading or unloading the cargo on the ship, and to supply the electric power of the battery to the terrestrial destination.

According to the embodiment of the present invention, it is possible to achieve a zero pollutant emission amount by driving the propellant by receiving electric power through a battery in a sea area to which environmental pollution control is applied.

Also, according to the embodiment of the present invention, as the propulsion engine and the power generation engine installed on the ship are charged with the electric power produced through the generator connected to the engine during operation, the ship is loaded or unloaded Even if the engine for propulsion and the engine for power generation are stopped, the electric power charged in the battery is supplied to the terrestrial station, which is suitable for cold-ironing.

1 is a diagram of a hybrid power generation and propulsion system according to a first embodiment of the present invention,
2 is a diagram illustrating a hybrid power generation and propulsion system according to a second embodiment of the present invention;
3 is a view showing a flow of electric power during constant speed operation,
FIG. 4 is a view showing a flow of electric power when the marine station is applied to the environmental pollution regulation, and
5 is a view showing a flow of electric power when the driving engine is stopped.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 schematically show a power generation and propulsion system in which, for example, two propulsion engines 40 are installed in a ship and two power generation engines 50 are installed.

In FIG. 1, a hybrid power generation and propulsion system in which a power conversion device 20 is installed in a ship is shown. In FIG. 2, a hybrid power generation and propulsion system, which is supplied from a battery in a ship through a power conversion device 20 installed on the land, .

Each propulsion engine 40 is configured to directly transmit power directly to a propellant 42, for example a propeller. In addition, each of the power generation engines 50 may be configured to directly drive the generator 52. The generator 52 driven by the power generation engine 50 generates electric power and the produced electric power is supplied to the various power demand sites in the ship via the bus 60 or a converter 54 for converting the electric power into charging electric power And is supplied directly to the battery 30. [

The battery 30 receives and stores electric power onshore. 1, the battery 30 is connected to the power conversion apparatus 20 installed in the ship or to the power conversion apparatus 20 provided on the shore as shown in FIG. 2, Lt; / RTI >

The power conversion apparatus 20 described above includes a transformer 22 for transforming the offshore power and a transformer 22 which is located between the transformer 22 and the battery 30 and which supplies power transformed by the transformer 22 to the battery 30 The power converter 24 converts the power supplied from the power converter 24 into electric power.

According to the present invention, the hybrid power generation and propulsion system can be equipped with an engine of the same kind to propel the ship by propelling the propulsion body 42 of the ship while meeting the amount of power required by various power consumers installed in the ship .

The propulsion engine 40 may be a MEGI engine, and the power generation engine 50 may be a MEGI engine. That is, the hybrid power generation and propulsion system of the present invention can propel the ship by mounting the engine of the same type, meeting the amount of power required by various power consumers installed in the ship, and driving the propulsion body 42 of the ship. The expression "engine of the same kind" or "engine of the same specification" in this specification means not only an engine having the same outer shape and structure as the engine but also a fuel And the required pressure and required temperature for the fuel oil) are the same.

The motor 43 and the generator 44 may be connected to the propulsion engine 40 via a gear box 46, for example. And between the propulsion engine 40 and the gear box 46, between the gearbox 46 and the propulsion body 42, between the gearbox 45 and the motor 43 and between the gearbox 46 and the generator 44 Respectively, so that power transmission can be controlled. The generator 44 is driven by the drive of the propulsion propulsion engine 40 or the motor 43 to produce electric power.

The hybrid power generation and propulsion system of the present invention described above is not operated in the engine propulsion mode only at the constant speed of the ship, but is operated normally when the propulsion engine 40 is driven normally and at the same time, The battery 30 can be charged by the power generated by the generator 44 and the battery 30 can be charged through the generator 52 driven by the engine 50 for power generation.

This generator 44 is electrically connected to the BUS 60 and a converter 48 is disposed between the generator 44 and the battery 30 to convert the power produced by the generator 44 into charging power .

A converter 54 for converting power produced by the generator 52 may be disposed between the generator 52 and the battery 30 driven by the engine 50 for power generation.

For example, the hybrid power generation and propulsion system of the present invention can be operated in the motor propulsion mode when the ship is traveling around a port or the propulsion engine is inoperable. At this time, the drive of the propulsion engine 40 is stopped and the clutch between the gearbox 46 and the propulsion engine 40 is released. The propellant 42 may be driven by a motor 43 connected to the motor 43 through the gear box 46 and powered by the battery 30. The motor 43 is connected through an inverter 47 that converts the electric power of the battery 30 to the speed of the corresponding motor 43.

Therefore, when it is not necessary to drive the engine for propulsion, such as when traveling at low speeds such as when entering or leaving a port, or when passing through a canal, The propellant 42 can be driven, so that the sea area adjacent to the port can be a pollutant discharge source in the sea to which the environmental pollution control is applied, thereby satisfying the environmental pollution control condition.

On the other hand, the electric power charged in the battery 30 can be supplied to a shore-side destination during shipment or unloading of the cargo.

Hereinafter, the operation of the hybrid power generation and propulsion system of the present invention will be described with reference to Figs. 3 to 5. Fig.

The hybrid power generation and propulsion system may be operated in the power generation and charging mode at the constant speed operation of the ship shown in FIG. 3, in the motor propulsion mode at the port entrance shown in FIG. 4, or in the propulsion engine 40 ) Can be operated in the stop mode.

For example, during constant speed operation of the ship, as shown in FIG. 3, the hybrid power generation and propulsion system may be operated in the engine propulsion mode. At this time, the propulsion engine 40 can drive the propellant 42 and can transmit the power to the generator 44 through the gear box 46. The generator 44 is driven by the power received from the propulsion engine 40 to produce electric power and the produced electric power is supplied to the electric power consumer through the BUS 60 or to the battery 30 via the converter 48 Lt; / RTI >

The power generation engine 50 is also operated to drive the generator 52 and the electric power generated by the generator 52 is supplied to the electric power consumer through the BUS 60 or is supplied to the battery 30 ). ≪ / RTI >

The electric power produced by the generator 44 can be partially supplied to the BUS 60 and the remaining part can be supplied to the motor 43. [ The motor 43 may be powered from the battery 30 via the inverter 47 or may receive some power generated by the generator 44.

Meanwhile, if the ship equipped with the hybrid power generation and propulsion system of the present invention is a cargo ship such as an LNG carrier, the hybrid power generation and propulsion system can be operated in the power generation mode while the cargo is loaded and unloaded at the port.

More specifically, the clutch between the gear box 46 and the propellant 42 is released during operation in the power generation mode, and the propulsion engine 40 can drive the generator 44 to produce electric power. At this time, the power generation engine 50 also drives the generator 52 to produce electric power. The generated power is stored in the battery 30 and can be supplied to the onshore power demand or onshore power reservoir while loading and unloading the cargo at the port.

In this way, when the hybrid power generation and propulsion system is operated in the power generation mode, all the engines 40 and 50 installed for propulsion and power generation are utilized to charge the battery 30 with electric power produced by the electric power generation, (60).

Since the hybrid power generation and propulsion system of the present invention utilizes the same kind of MEGI engine as both the power generation engine and the propulsion engine, regardless of the mode in which the hybrid power generation and propulsion system is operating, the MEGI engine It is only necessary to treat the LNG and the evaporating gas in accordance with the required pressure and temperature.

Fig. 4 is a diagram showing the flow of electric power when the marine operation is applied to the environmental pollution control. 4, the flow of electric power supplied to the motor 43 is represented by a dotted line, and the flow of electric power supplied to the propulsion engine 40 and the power generation engine 50 The flow of power transmitted from the engine 50 and the flow of power produced by the engine are indicated by solid lines.

For example, when entering the port, as shown in FIG. 4, the hybrid power generation and propulsion system may be operated in the motor propulsion mode. At this time, the propulsion engine 40 may be gradually stopped and operated in a motor propulsion mode in which the motor 43 is driven.

First, the driving of the propellant 42 due to the power of the propulsion engine 40 is gradually stopped, and the propellant 42 is driven by the motor 43 supplied with electric power from the battery 30. As a result, marine vessels adjacent to the harbor can achieve zero emissions of pollutants at the port, as the ship is propelled electrically in the waters where the environmental pollution control is applied.

The motor 43 can receive power from the battery 30 as well as the generator 44 that generates power through the power of the propulsion engine 40. [

The generator engine 50 is also operated to drive the generator 52 and the electric power generated by the generator 52 is supplied to the electric power consumer via the BUS 60 or the battery 54 via the converter 54, (30).

As described above, the MEGI engine as the propulsion engine 40 can be used as a fuel while using both fuel (e.g., HFO, MDO) and fuel gas (e.g., LNG, LPG, DME, (For example, 30% or less of the maximum output) is required, the fuel is supplied to the engine to obtain the output, and when high output (for example, 30% or more of the maximum output) is required, And is supplied to the engine to obtain an output. Thus, when driving the engine for propulsion is not required, such as when traveling at low speeds, such as when entering a port or departing, or when passing through a canal, the driving of the propulsion engine 40 is stopped, Since the propellant 42 is driven by the motor 43 supplied with electric power, the sea area adjacent to the port can satisfy the environmental pollution control condition in the sea to which the environmental pollution control is applied.

5 is a view showing a flow of electric power when the driving engine is stopped. Here, the flow of electric power supplied to the motor 43 is represented by a dotted line, and the electric power supplied to the motor 43 is driven by the power generation engine 50 The flow of electric power produced by the generator 52 is indicated by a solid line.

For example, when the driving engine 40 is stopped, the hybrid power generation and propulsion system is operated in the motor propulsion mode, as shown in Fig. Since the propulsion engine 40 is in the stopped state, the propulsion body 42 is driven by the motor 43 supplied with electric power from the battery 30. Even when the driving engine is stopped, the battery 30 is charged through the electric power produced by the engine 50 for power generation.

The speed of the motor is controlled by the motor 43 via the inverter 47 and the power supplied from the battery 30. [

The hybrid electric power generation and propulsion system of the present invention is a hybrid electric power generation and propulsion system in which the driving of the propulsion engine 40 is stopped and the propulsion body is driven through the motor 43 supplied with the electric power of the battery 30, As the ship can be propelled by the propulsion method, the waters adjacent to the port can achieve the zero pollutant discharge due to the fuel flow, even if it operates the sea where the environmental pollution regulation is applied.

The hybrid power generation and propulsion system of the present invention is a hybrid power generation and propulsion system in which a propulsion engine 40 and a generator 50 for generating electric power by the power of each engine 40, The battery 30 can be supplied with electric power of the battery 30 charged to a place on the shore while the ship is being shipped or unloaded.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

10: Power on the land 20: Power converter
22: Transformer 24: Power converter
30: Battery 40: Propulsion engine
42: Propellant 43: Motor
44, 52: generator 46: gear box
47: inverters 48, 54: converter
50: power generation engine 60: bus

Claims (15)

As a hybrid power generation and propulsion system for a ship to propel a ship by driving a propulsion body of a ship while meeting the amount of electric power required by a power consumer installed in the ship,
A battery installed in the ship for storing electric power supplied from the land;
A propulsion engine that uses natural gas as fuel and drives the propellant; And
And a motor for driving the propellant by receiving power from the battery in an environment-
Hybrid generation and propulsion systems. The method according to claim 1,
Wherein the ship is provided with a power conversion device including a transformer and a power converter and supplies power supplied from the land via the power conversion device to the battery,
Hybrid generation and propulsion systems. The method according to claim 1,
Wherein the battery is supplied with power from the onshore via a power conversion device installed on the land,
Hybrid generation and propulsion systems. The method according to claim 1,
Wherein the motor is a motor-
Hybrid generation and propulsion systems. The method according to claim 1,
Further comprising a power generation engine using the natural gas as fuel,
The generator connected to the power generation engine is connected directly to the BUS or to the battery through a converter that converts the power into charging power.
Hybrid generation and propulsion systems. The method according to claim 1,
Wherein the propulsion engine is connected to the motor through a gear box and connected to the generator through the gear box,
The generator is connected to the battery via a converter electrically connected directly to the BUS or converted into charging power to the battery,
Hybrid generation and propulsion systems. The method according to claim 1,
An inverter is disposed between the battery and the motor,
Wherein the inverter controls a speed of the motor by changing a frequency of power supplied from the battery,
Hybrid generation and propulsion systems. The method according to claim 1,
Wherein the propulsion engine and the power generation engine are both MEGI engines,
Hybrid generation and propulsion systems. The method of claim 5,
And stopping the propulsion engine and the power generation engine while the ship is being shipped or unloaded, and supplying the electric power of the battery to an on-
Hybrid generation and propulsion systems. The method of claim 6,
Wherein a clutch is provided between the propulsion engine and the gearbox, between the gearbox and the propellant, between the gearbox and the generator, and between the gearbox and the motor,
Hybrid generation and propulsion systems. A method of operating a ship for propelling a ship by driving propulsion of the ship while meeting the amount of power required by a power consumer installed in the ship,
The power supplied from the land is stored in the battery,
The propellant is driven by a propulsion engine using natural gas as fuel,
Wherein the propellant is driven by a motor supplied with electric power from the battery when operating a sea area to which environmental pollution control is applied,
How the ship operates. The method of claim 11,
Wherein the propulsion engine is driven by the propulsion engine during constant speed operation of the ship,
And a power transmission unit for transmitting power to a generator connected to the propulsion engine via a gear box with an extra output of the propulsion engine,
Wherein the electric power generated by the generator is supplied to the electric power consumer through the BUS, or the battery is charged through the converter,
How the ship operates. The method of claim 11,
Wherein when the propulsion engine and the power generation engine are operated at the same time during operation of the sea area to which the environmental pollution control is applied, the power to the propulsion driven by the propulsion engine is gradually stopped,
The propellant is driven by the motor supplied with the power of the battery,
A power generator connected to the power generating engine,
How the ship operates. 14. The method of claim 13,
When the propulsion engine is stopped and the power generation engine is operated at the time of operating the sea area to which the environmental pollution control is applied, the propulsion body is driven by the motor supplied with the power of the battery,
A power generator connected to the power generating engine,
How the ship operates. The method of claim 11,
Stopping the propulsion engine and the power generation engine while loading or unloading the cargo on the ship,
The power of the battery is supplied to an on-
How the ship operates.

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