KR101805501B1 - Hybrid generation and propulsion system for a vessel - Google Patents

Abstract

The present invention relates to a hybrid generation and propulsion system for a vessel, capable of realizing propulsion using a propulsion engine, a generation engine, or the propulsion and generation engines installed in a vessel, realizing boosting through operation of a motor, and safely sailing to the inside of a port. According to one embodiment of the present invention, the hybrid generation and propulsion system satisfies electricity required from power consumption places installed in the vessel and, at the same time, operates a propulsion body of the vessel to propel the vessel. The system comprises: a propulsion engine including a plurality of propulsion bodies, using natural gas as fuel, and operating the propulsion bodies; a first generator receiving power of the propulsion engine to produce electricity; a motor to receive the electricity produced by the first generator; and a gear box connected to all of the plurality of propulsion bodies, and transferring power between the plurality of propulsion bodies and the motor.

Description

[0001] HYBRID GENERATION AND PROPULSION SYSTEM FOR A VESSEL [0002]

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

There is also a need for improved ship propulsion and propulsion systems that can safely berth into the harbor even if the propulsion engine is switched off.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a propulsion engine, a power generation engine, or a propulsion engine and a power generation engine, And to provide a ship having a hybrid power generation and propulsion system capable of operating safely.

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 demanded in a ship, A propulsion engine that uses natural gas as a fuel and drives the propellant; A first generator for receiving power from the propulsion engine to produce electric power; A motor supplied with electric power produced by the first generator; And a gearbox coupled to both of the plurality of propellants, the gearbox transferring power between the plurality of propellants and the motor.

A power generation engine using the natural gas as fuel and a second generator for generating power by receiving the power of the power generation engine.

The power generated by the first generator is electrically connected to the BUS and is supplied to the motor through the BUS. A frequency of power generated by the first generator is changed between the BUS and the motor, An inverter for controlling the speed of the inverter can be disposed.

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

A clutch may be provided between the propulsion engine and the gearbox, between the gearbox and the propellant, and between the motor and the gearbox to enable transmission and release of power.

Wherein the propulsion engine and the power generation engine are plural, the plurality of propulsion engines drive the plurality of propellants during the constant speed operation of the ship, and the power generated from the first and second generators is transmitted through the BUS And can be supplied to the power requirement destination in the ship.

Wherein the plurality of propulsion engines and the plurality of engines for power generation are driven, and when one of the plurality of propellants is driven by one propulsion engine among the plurality of propulsion engines, And the other propellant may be driven through the motor supplied with the electric power generated by the first generator that receives the power of the driven propulsion engine.

Wherein the plurality of the propulsion engines collects electric power produced by the second generator directly connected to each of the plurality of power generation engines when the plurality of the propulsion engines can not be used and supplies the electric power to the motor, To drive the plurality of propellants.

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 power required by a power consumer installed in the ship and driving a propulsion body of the ship, wherein the ship has a plurality of propellants, A propulsion engine that uses gas as fuel and drives the propellant; A first generator for receiving power from the propulsion engine to produce electric power; A motor supplied with electric power produced by the first generator; And a gearbox connected to both of the plurality of propellants and transmitting power between the plurality of propellants and the motor.

According to the operation method of the ship, the propulsion engine and the power generation engine are plural, and the power generation engine using the natural gas as fuel, the second generator for generating power by receiving the power of the power generation engine, Wherein the plurality of propellants are driven through the plurality of propulsion engines during constant speed operation of the ship, and the electric power generated from the first and second generators is transmitted to the power requirement source Can supply.

According to the operation method of the ship, the propulsion engine and the power generation engine are plural, and the power generation engine using the natural gas as fuel, the second generator for generating power by receiving the power of the power generation engine, Wherein one of the plurality of propellants is driven by one propulsion engine of the plurality of propulsive engines and the other propellant is driven by the propulsion engine of the plurality of propulsive engines, The power generated by the first generator that has received the power of the propulsion engine may be driven through the motor.

According to the operation method of the ship, the propulsion engine and the power generation engine are plural, and the power generation engine using the natural gas as fuel, the second generator for generating power by receiving the power of the power generation engine, And collecting electric power produced by the second generator directly connected to each of the plurality of power generation engines when the plurality of the propulsion engines are disabled, and supplying the collected electric power to the motor, The plurality of propellants can be driven through the gear box being driven.

According to the embodiment of the present invention, it is possible to perform boosting through propulsion and motor maneuvers using a propulsion engine, a power generation engine, or a propulsion engine and a power generation engine installed in a ship, .

According to an embodiment of the present invention, when operating a marine area to which environmental pollution control is applied, electric power generated by one of a plurality of propulsion engines and a plurality of power generation engines and a power generation engine is supplied from a motor There is also an effect of reducing pollutant emissions by driving the propellant through the gear box.

Also, according to the embodiment of the present invention, even when the propulsion engine is turned off, the electric power produced through the engine for power generation can be supplied from the motor to safely and safely dock to the port.

1 is a diagram of a hybrid power generation and propulsion system in accordance with an embodiment of the present invention;
FIG. 2 is a diagram showing a flow of electric power at a constant speed operation,
FIG. 3 is a view showing a flow of electric power in an operation of a marine area to which environmental pollution control is applied, and
Fig. 4 shows the flow of electric power when all of the propulsion engines are stopped. Fig.

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

1 schematically shows a hybrid 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.

Each propulsion engine 40 is configured to directly transmit power directly to a propellant 42, for example a propeller. Further, each of the power generation engines 50 may be configured to directly drive the second generator 52. [ The second generator 52 driven by the power generation engine 50 generates electric power and the produced electric power is supplied to various power consumers in the ship via the BUS 60 or is supplied to the motor 43 .

According to the present invention, the hybrid power generation and propulsion system of a ship is equipped with an engine of the same kind to satisfy the amount of power required by various power consumers installed in the ship, and also drives the propulsion body (42) .

The propulsion engine 40 may be a MEGI engine, and the power generation engine 50 may be a MEGI engine. In other words, the hybrid power generation and propulsion system of the present invention can be equipped with the same kind of engine to meet the amount of power required by various power consumers installed in the ship, and at the same time, propelling the propulsion body 42 of the ship to propel 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 propulsion engine 40 may be connected to the propellant 42 via the first generator 44 and the gearbox 46, respectively. A clutch may be disposed between the propulsion engine 40 and the gearbox 46, between the gearbox 46 and the propulsion body 42, and between the gearbox 46 and the motor 43, Can be controlled. The first generator 44 is driven by the power of the propulsion engine 40 to produce electric power.

The hybrid power generation and propulsion system of the present invention is not operated in the engine propulsion mode only at the constant speed operation of the ship and the propulsion engine 40 is normally driven and the first generator 44 can be supplied to the motor 43 via the BUS 60 or to the power source in the ship via the BUS 60. [

The power generation engine 50 drives the second generator 52 as described above. The electric power generated by the second generator 52 which receives the power of the power generation engine 50 is supplied to the motor 43 through the bus 60 or to the power requirement in the ship via the bus 60 .

For example, the hybrid generation and propulsion system of the present invention can be operated in the motor propulsion mode when the ship is operating around the port or when the propulsion engine is inoperable. At this time, the drive of the propulsion engine 40 is stopped, and the clutch between the gear box 46 and the propulsion engine 40 is released. The propellant 42 is connected to the motor 43 via the gearbox 46 and is connected to the motor 43 via the first generator 44, the second generator 52 or the first and second generators 44, And can be driven by a motor 43 supplied with power. The motor 43 is connected through an inverter 47 that converts the electric power supplied through the BUS 60 to the speed of the motor 43.

Thus, when there is no need to drive the engine for propulsion, such as at low speeds such as when entering a port or departing, or when passing through a canal, the first generator 44, the second generator 52, Since the propellant 42 can be driven through the motor 43 supplied with the electric power produced by the first and second generators 44 and 52, It is possible to meet the environmental pollution control condition by discharging it.

For example, the hybrid power generation and propulsion system of the present invention, with two propulsion engines 40, two power generation engines 50, and two propellants 42, When the propulsion engine 40 of the two power generation engines 50 is driven, the first generator 44 is driven through the driven propulsion engine 40 and the second generator 44 is driven through at least one of the two power generation engines 50 2 generator 52 is supplied to the motor 43 via the BUS 60. The motor / At this time, any one of the two propellants 42 is driven through the driven propulsion engine 40 and the other propulsion is driven through the motor 43 to drive the two propulsion engines 40 The amount of pollutants to be discharged can be reduced compared to driving two propellants 42 using the same.

In particular, even if both of the two propulsion engines 40 are stopped, the motor 43 receives the electric power generated from the second generator 52, which receives the power of the two power generation engines 50, The pollutant zero emission can be achieved in the sea area to which the environmental pollution control is applied and the propulsion engine 40 can be operated in the same manner as the propulsion engine 40 Even if the drive is stopped, it can berth safely in the harbor.

Hereinafter, the operation of the hybrid power generation and propulsion system of the present invention will be described with reference to Figs. 2 to 4. Fig.

The hybrid power generation and propulsion system is operated in the operation mode during the constant speed operation of the ship shown in FIG. 2, and operates in the operation mode during operation of the sea to which the environmental pollution regulation shown in FIG. 3 is applied, All of the engine 40 can be operated in the operating mode at the time of stopping the operation.

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 propulsion body 42 and can transmit power to the first generator 44. [ The first generator 44 is driven by the power received from the propulsion engine 40 to produce electric power and the produced electric power can be supplied to the electric power consumer through the BUS 60 or supplied to the motor 43 .

3, the two propelling engines 42 are driven through the two propulsion engines 40 and the electric power generated by the first generator 44, which receives the power of the two propelling engines 40, And the electric power generated by the second generator 52 which receives the power of the two power generation engines 50 is supplied to the BUS 60. [

The clutch between the gear box 46 and the propellant 42 is released during operation in the power generation mode, for example, and the propulsion engine 40 can drive the first generator 44 to produce electric power. At this time, the power generation engine 50 also drives the second generator 52 to produce electric power. The generated electric power is collected between the BUS 60 and the inverter 47, and the collected electric power is supplied to the motor 43 via the inverter 47.

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 used to generate electric power, and the generated electric power is supplied to the electric power consumer through the bus 60 Or may be supplied to the motor 43.

When the hybrid power generation and propulsion system is operated in the propulsion mode, the propulsion body 42 connected to each of the plurality of propulsion engines 40 through the gear box 46 is driven, and the power of the plurality of propulsion engines 40 A first generator 44 for receiving electric power and a second generator 52 for receiving the power of the plurality of power generation engines 50 and generating electric power, (43).

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. 3 is a view showing a flow of electric power when the marine operation is applied to the environmental pollution control. 3 is a graph showing the relationship between the amount of electric power supplied to the motor 43 and the amount of electric power supplied to the motor 43 in the case where one propulsion engine and one power generation engine out of two propulsion engines 40 and two power generation engines 50 are operated simultaneously The flow is indicated by a dotted line, and the flow of electric power through the propulsion engine 40 and the power generation engine 50 is indicated by a solid line.

For example, when entering a port where environmental pollution control is applied, the hybrid power generation and propulsion system can be operated in the partial motor propulsion mode, as shown in FIG. At this time, one of the two propulsion engines 40 can be operated in the partial motor propulsion mode in which the propulsion engine, which is driven through the propulsion engine stopped and stopped, is switched to the drive of the motor 43.

First, the propulsion engine of one of the two propulsion engines 40 stops driving, and the propulsion driven by the propulsion engine, which stops the driving, is transmitted to the gear box 46 driven by the driving of the motor 43, As shown in FIG. At this time, the motor 43 receives the electric power produced by the driven propulsion engine and the electric power produced by one of the two power generation engines 50 through the BUS 60. Here, power is supplied through the second generator 52 that receives power from any one of the two power generation engines 50. However, the two power generation engines 50 are all driven It is needless to say that the electric power produced through the second generator 52 of the two power generation engines 50 can be supplied from the motor 43 via the BUS 60.

Accordingly, in the sea area adjacent to the port, the propulsion engine of one of the two propulsion engines is driven in the sea to which environmental pollution control is applied, and the other propulsion body is driven by the motor 43 To reduce the emission of pollutants and to safely dock at the port at minimum speed.

4 is a view showing a flow of electric power when all driving engines are stopped. Here, the two propulsion engines 40 are stopped and the flow of electric power supplied to the motor 43 is indicated by a dotted line in the power flow at the time of driving the two power generation engines 50, The flow of electric power produced by the second generator 52 driven by the first generator 52 is indicated by a solid line.

For example, when the two propulsion engines 40 are stopped, the hybrid power generation and propulsion system is operated in the motor propulsion mode, as shown in FIG. The electric power generated from the second generator 52 that has received the power of the two power generation engines 50 is supplied to the motor 43 that is supplied through the bus 60 because the driving engine 40 is in a stopped state And drives the propellant 42 through the gear box 46 driven accordingly.

The hybrid power generation and propulsion system of the present invention stops the driving of all the propulsion engines 40 installed in the marine vessel where the environmental pollution control is applied, 43, it is possible to propel the ship by an electric propulsion system that drives the propellant 42. Therefore, even if the sea adjacent to the port is operated in the sea to which the environmental pollution control is applied, .

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. Therefore, when driving the engine for propulsion is not required, such as when operating at low speeds such as when entering or leaving a port, or when passing through a canal, the driving of the two propulsion engines 40 is stopped and two Since the two propellants 42 are driven through the gear box 46 driven by the motor 43 supplied with the electric power generated through the power generation engine 50, It is possible to satisfy the environmental pollution control condition in the applied sea area.

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.

40: propulsion engine 42: propellant
43: motor 44: first generator
46: gear box 47: inverter
50: power generation engine 52: second generator
60: bus

Claims (12)

A hybrid power generation and propulsion system for a ship for propelling a ship by driving a propulsion body of a ship while generating an amount of electric power to be supplied to a power demanded place installed in the ship,
The propellant is plural,
A propulsion engine that uses natural gas as fuel and drives the propellant;
A first generator for receiving power from the propulsion engine to produce electric power;
A power generation engine using the natural gas as fuel;
A second generator that receives power from the power generation engine and generates electric power;
A motor supplied with electric power produced by the first generator; And
And a gear box connected to all of the plurality of propellants and transmitting power between the plurality of propellants and the motor,
Wherein the propulsion engine and the power generation engine are plural,
Wherein the plurality of propulsive engines drive the plurality of propellants during constant speed operation of the ship, and the electric power generated from the first and second generators is supplied to the power consuming destination in the vessel through the BUS, The propulsion engine of any one of the plurality of propulsion engines is driven by the propulsion engine of the plurality of propulsion engines and the propulsion engine of the other propulsion engine is driven by the driving propulsion engine The power generated by the second generator directly connected to each of the plurality of power generation engines when the plurality of the propulsion engines can not be used, And a plurality of motors for driving the plurality of motors through the gear box driven by the motors, A hybrid power generation and propulsion system for driving a sieve. delete The method according to claim 1,
Wherein an inverter is arranged between the BUS and the motor for controlling the speed of the motor by changing the frequency of the power produced by the first generator.
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 according to claim 1,
Wherein a clutch is provided between the propulsion engine and the gearbox, between the gearbox and the propellant, and between the motor and the gearbox to enable transmission and release of power,
Hybrid generation and propulsion systems. delete delete delete delete delete delete delete

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