KR20230052661A - DC distribution electric propulsion vessel - Google Patents

Abstract

The present invention relates to a direct current distribution electric propulsion ship. More specifically, the present invention relates to direct current distribution electric propulsion ship including: a propulsion unit which provides propulsion to the hull; an engine unit which generates the power necessary to operate the propulsion unit; and a battery unit which supplies power to start the engine unit. The propulsion unit, engine unit, and battery unit are formed of a direct current-based power system. A liquefied petroleum gas (LPG) engine generator, which is equipped to operate an engine using LPG as fuel and convert it into electric power, can reduce fuel consumption by controlling the rotation speed according to the amount of power required by the propulsion unit.

Description

DC distribution electric propulsion vessel}

The present invention relates to a direct current distribution electric propulsion line, and more particularly, to a direct current distribution electric propulsion line using an LPG engine generator to which a variable speed technology is applied.

Currently, most ship power switching systems are configured based on AC, and are formed in a structure in which alternating current is generated from a generator and supplied to alternating current loads through substation and distribution facilities.

In such an existing AC-based system, since the generator operates at a fixed frequency, there is a problem in that it cannot overcome the problem of increased fuel consumption during low load operation.

In addition, in the electric propulsion system, which is mainly applied to shuttle tankers, drillships, offshore work vessels, LNG carriers and LPG carriers, a two-step conversion process of AC/DC (Converter) and DC/AC (Inverter) is required to control the propulsion motor. there is

In contrast, the DC-based power system system uses an AC/DC converter at the rear end of the alternator to distribute direct current. It is a one-step conversion process of AC (Inverter) and has various advantages such as easy grid connection, and has been recently developed in various ways.

For example, as disclosed in Korean Patent Registration No. 10-1974128, the conventional ship power system can supply mutual power through the power system, can utilize the advantages of the DC power system and the AC power system, and is stable. It is to provide a power system for ships that provides power distribution.

The marine power system system as described above has an advantage in that it is possible to supply mutual power through an alternative power system in case of a power system failure, but since the generator operates at a fixed frequency, there is a problem in that a lot of fuel is consumed unnecessarily. there is.

Korean Patent Publication No. 10-2020-0022869

Therefore, the present invention has been made to solve the problems of the prior art as described above, for a propulsion unit for imparting propulsion to the hull, an engine unit for generating power necessary for the propulsion unit to operate, and for starting the engine unit. An LPG engine including a battery unit for supplying power, wherein the propulsion unit, the engine unit, and the battery unit are formed in a direct current-based power system and are provided to operate an engine using liquefied petroleum gas as a fuel and convert it into electric power. The purpose of the generator is a DC distribution electric propulsion line capable of reducing fuel consumption by controlling the rotational speed according to the amount of power required by the propulsion unit.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems to be solved by the present invention that are not mentioned here are to those of ordinary skill in the art to which the present invention belongs from the description below. will be clearly understood.

In order to achieve the above object, the DC distribution electric propulsion ship according to the present invention is provided on a hull that can move while floating on the sea, a cabin provided at the front upper part of the hull, and a rear upper part of the hull, inside It includes a storage unit in which fuel is accommodated, and the hull includes a propulsion unit for providing propulsion to the hull, an engine unit for generating power necessary for the propulsion unit to operate, and a battery unit for supplying power to start the engine unit. And, the propulsion unit, the engine unit and the battery unit are characterized in that formed by a DC-based power system.

In addition, the engine unit of the present invention is provided adjacent to a plurality of LPG engine generators and the LPG engine generator so that the engine using liquefied petroleum gas as fuel can be operated and converted into electric power, so that the LPG engine generator And a governor for controlling, characterized in that the governor can reduce fuel consumption by controlling the rotational speed of the LPG engine generator according to the amount of power required by the propulsion unit.

In addition, the engine unit of the present invention further includes a DC switchboard provided on one side of the hull and forming a connection point of a DC electric circuit, the DC switchboard,

A power management control panel controlling power generated by the LPG engine generator, a hotel load inverter supplying load power within the hull, and a propulsion motor inverter supplying power to the propulsion unit, wherein the power management control panel includes the LPG Connected to the engine generator, battery unit, hotel load inverter and propulsion motor inverter, it is characterized in that the state of the LPG engine generator, battery unit, hotel load inverter and propulsion motor inverter can be monitored and controlled.

In addition, the cabin of the present invention includes an energy management control panel that monitors and controls the power generated by the LPG engine generator, and the energy management control panel is connected to the power management control panel to include the power management control panel and the LPG engine. It is characterized in that it can monitor and control the conditions of the generator, battery unit, hotel load inverter, and propulsion motor inverter.

In addition, the LPG engine generator of the present invention includes an expansion tank provided to prevent air intrusion, a fuel injection port through which the liquefied petroleum gas can be injected or discharged, a seawater outlet through which seawater is discharged, and purification of impurities in engine oil. an oil filter, a seawater inlet through which the seawater flows, a combustion air inlet through which air is supplied for combustion of the liquefied petroleum gas, an engine oil outlet through which the engine oil is discharged, an exhaust gas outlet through which exhaust gas is discharged, and the LPG engine. It is characterized in that it includes a control box for controlling the operation of the seawater outlet and seawater inlet according to the load of the generator.

As described above, according to the present invention, the direct current distribution electric propulsion line has an effect of reducing fuel consumption and improving the durability of the engine because it is unnecessary to maintain the rated speed due to the LPG engine generator to which the variable speed technology is applied.

In addition, the present invention has an effect of reducing the load of the LPG engine and reducing fuel consumption by applying a variable speed control system to the LPG engine generator.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the detailed description and claims.

1 is a side view of a DC distribution electric propulsion line according to the present invention.
2 is a front view of a DC distribution electric propulsion line according to the present invention.
3 is a view of the DC distribution electric propulsion line according to the present invention viewed from the rear.
4 is a view showing the state of the upper end of the hull of the DC distribution electric propulsion line according to the present invention.
5 is a view showing the inside of the hull of the DC distribution electric propulsion ship according to the present invention.
6 is a side view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention.
7 is a plan view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention.
8 is a bottom view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention.
9 is a partially enlarged cross-sectional view of FIG. 6 of the present invention. (Fig. 6 AA attempt)
10 is a side view of the LPG engine generator of the DC distribution electric propulsion line as viewed from the front according to the present invention.
11 is a power system diagram of a DC distribution electric propulsion line according to the present invention.
12 is a control flow chart of a DC distribution electric propulsion line according to the present invention.
13 is a control configuration diagram of a DC distribution electric propulsion ship LPG engine generator according to the present invention.

The terms used in this specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected from general terms that are currently widely used as much as possible while considering the functions in the present invention, but these may vary depending on the intention of a person skilled in the art or precedent, the emergence of new technologies, and the like. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term.

In the entire specification, when a certain part is said to "include" a certain component, this means that it may further include other components without excluding other components unless otherwise stated.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The specific details, including the problem to be solved, the means for solving the problem, and the effect of the invention with respect to the present invention are included in the embodiments and drawings to be described below. Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

1 is a side view of a DC distribution electric propulsion line according to the present invention, Figure 2 is a front view of a DC distribution electric propulsion line according to the present invention, Figure 3 is a rear view of a DC distribution electric propulsion line according to the present invention 4 is a view showing the top of the hull of the DC distribution electric propulsion line according to the present invention, FIG. 5 is a view showing the inside of the hull of the DC distribution electric propulsion line according to the present invention, FIG. Figure 7 is a plan view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention, Figure 8 is a bottom view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention, Figure 9 is this Invention Partially enlarged cross-sectional view of FIG. 6, FIG. 10 is a side view of the LPG engine generator of the DC distribution electric propulsion line according to the present invention viewed from the front, FIG. 11 is a power system diagram of the DC distribution electric propulsion line according to the present invention, FIG. 13 is a control block diagram of a DC distribution electric propulsion line LPG engine generator according to the present invention.

Hereinafter, the DC distribution electric propulsion line 10 according to the present invention will be described in detail with reference to the accompanying drawings.

The DC distribution electric propulsion line 10 according to the present invention is formed as a DC-based power system, and the LPG engine generator 121 provided to convert it into electric power by operating an engine using liquefied petroleum gas as a fuel is propulsive. It is characterized in that the fuel consumption can be reduced by controlling the rotational speed according to the amount of power required in the unit 110.

1 to 4, the DC distribution electric propulsion ship 10 includes a hull 100 that can move while floating on the sea, and a cabin 200 provided at the front upper portion of the hull 100 and the hull It is provided on the rear upper part of the 200, and includes a container part 300 in which fuel is accommodated.

First, a hull 100 that can move while floating on the sea is provided. The hull 100 corresponds to the main part and structure of the DC distribution electric propulsion line 10 and constitutes the main body. The hull 100 is formed in a form in which the width becomes thinner from the rear to the front of the hull 100 so that it can be moved in a floating state on the sea. In addition, the hull 100 may be formed of an aluminum material. Accordingly, the hull 100 can prevent corrosion caused by seawater.

In addition, in the hull 100, an empty space is formed inside the hull 100 so that a configuration capable of controlling the DC distribution electric propulsion line 10 is located.

In addition, a plurality of frames may be installed at the inner edge of the hull 100 to reinforce the lateral force applied to the hull 100 . Of course, the hull 100 is formed in a watertight structure so as not to be submerged inside.

In addition, the hull 100 includes a cushioning material 101 installed at the edge of the hull 100. The cushioning material 101 can prevent the ship and the hull 100 from colliding with each other and being damaged when the ship is moored by the DC electric propulsion ship 10 . The buffer material 101 is preferably formed of a material having excellent seawater resistance, impact resistance, oil resistance, and abrasion resistance. The cushioning material 101 may be formed of a material such as rubber, for example. The cushioning material 101 is installed around the edge of the hull 100 except for the rear of the hull 100, and has a form protruding from the edge of the hull 100.

In addition, the hull 100 includes a protector 102 installed at the rear edge of the hull 100 . The protector 102 has a form protruding from the edge of the hull 100 like the cushioning material 101. The upper part of the protector 102 is installed at the same height as the upper part of the hull 100, and the lower part of the protector 102 is installed to extend further downward than the position of the cushioning material 101. And, the protector 102 is formed in an upward curve at the bottom of the cushioning material 101 .

Accordingly, the protector 102 serves as the eaves of the hull 100, and when driving force is generated in the propulsion unit 110 to be described later, it is possible to prevent seawater from rising to the hull 100. Of course, the shock absorber 101 and the protector 102 may have the same effects, depending on the type of ship moored by the DC distribution electric propulsion ship 10. Allows configuration of different shapes and sizes.

In addition, the hull 100 includes a guardrail 103 installed at the edge of the hull 100. The guardrail 103 is provided for the safety of users in the hull 100. A plurality of guardrails 103 may be installed at the edge of the hull 100, and it is preferable to have a height that prevents the user from leaving the hull 100.

In addition, the hull 100 includes a propulsion unit 110 provided at the inner rearmost part of the hull 100 and imparting a driving force to the hull 100 .

More specifically, referring to FIG. 5, the propulsion unit 110 is a propulsion device 111 and the propulsion unit 110 generating propulsion force in the hull 100. ) To generate a propulsive force, a configuration including a propulsion motor 112 connected to the propulsion device 111 to transmit rotational power, which allows the hull 100 to generate a propulsive force that can be moved is a zone

The propulsion device 111 is installed in plurality in the hull 100, and can generate propulsive force to the hull in a water jet method that sucks and blows seawater into the propulsion device 111. Thus, the propulsion device 111 may include a housing, an impeller, a shaft, and a propeller.

The propulsion motor 112 is directly connected to the propulsion device 111 so as to transmit rotational power to the propulsion device 111 . The propulsion motor 112 is operated by receiving electricity, and is provided with the same number of propulsion devices 111 as a matter of course. The propulsion motor 112 may be cooled using fresh water to prevent energization risk and corrosion during cooling. And, the propulsion device 111 and the propulsion motor 112 are preferably controlled by the cabin 200 .

In addition, the hull 100 is provided in front of the propulsion unit 110, and includes an engine unit 120 generating power necessary for the propulsion unit 110 to operate.

More specifically, referring to FIG. 5, the engine unit 120 is provided on one side of the hull 100, including an LPG engine generator 121 capable of converting liquefied petroleum gas into electric power by operating an engine using liquefied petroleum gas as fuel. and a DC switchboard 122 forming a connection point of a DC electric circuit, a power conversion filter 123 provided to remove noise of current, and nitrogen discharge provided to discharge liquefied petroleum gas to the outside using nitrogen. A device 124, a power converter 125 provided to convert power, and a governor 126 provided adjacent to the LPG engine generator 121 to control the LPG engine generator 121 As a configuration, it is an area where a mechanical device is located to operate and control the DC distribution electric propulsion line 10.

The LPG engine generator 121 is installed on one side of the engine unit 120, and is provided to supply power required for the DC distribution electric propulsion line 10 and to charge a battery unit 130 to be described later. The LPG engine generator 121 is driven by an LPG fuel engine, and an electric start method is used. The LPG engine generator 121 is formed to receive liquefied petroleum gas in a double pipe form from a tank connection part 320 to be described later. That is, the LPG engine generator 121 is a direct drive method for an LPG engine. In addition, the LPG engine generator 121 is installed in plurality in the hull 100, and is cooled by a water-cooled cooling method using seawater so as not to overheat due to a continuously applied load. In addition, the LPG engine generator 121 is installed to satisfy the IP23 standard.

In addition, referring to FIGS. 6 to 10, the LPG engine generator 121 includes an expansion tank 121-1 provided to prevent air intrusion, a fuel injection port through which the liquefied petroleum gas can be injected or discharged ( 121-2), a seawater outlet 121-3 through which seawater is discharged, an oil filter 121-4 which purifies impurities in engine oil, a seawater inlet 121-5 through which the seawater flows in, and a A combustion air inlet 121-6 through which air is supplied for combustion, an engine oil outlet 121-7 through which the engine oil is discharged, an exhaust gas outlet 121-8 through which exhaust gas is discharged, and the LPG engine generator ( 121) and a control box 121-9 for controlling the operation of the seawater outlet and the seawater inlet according to the load.

More specifically, referring to FIG. 6, the expansion tank 121-1 is installed on one side of the LPG engine generator 121 and is composed of a device capable of preventing fuel from being discharged from the tank due to expansion. The fuel inlet 121-2 is provided in two on one side of the LPG engine generator 121 so that the liquefied petroleum gas can be injected or discharged, and one of the two serves as an outlet and the other serves as an inlet. can be done The seawater discharge port 121-3 includes a pipe and a through hole so that seawater can be discharged from the LPG engine generator 121 and moved. The oil filter 121-4 is installed in plurality on one side of the LPG engine generator 121, and serves to purify impurities from engine oil. The seawater inlet 121-5 has a configuration including a pipe and a through hole so that seawater can flow into the LPG engine generator 121.

7 to 9, the combustion air inlet 121-6 is configured to allow air supplied for combustion of fuel to flow into the LPG engine generator 121, and the engine oil The outlet 121-7 has a plurality of circular holes formed on one side of the LPG engine generator 121 so that engine oil can be discharged. The exhaust gas outlet 121-8 has a circular hole through which exhaust gas can be discharged, and a rectangular connecting plate is formed at an end thereof to be connected to a pipe. The control box 121-9 is configured to control the operation of the seawater outlet and the seawater inlet according to the load of the LPG engine generator 121, so that the seawater is not overheated by the load applied to the LPG engine generator 121. Adjust the inflow of the water so that it can be cooled by water cooling.

The DC switchboard 122 is provided on one side of the engine part 120 to form a DC electric circuit connection point. Of course, the power distribution board 122 may include various devices complying with related regulations. At this time, the various devices may include, for example, a battery system, a starting system of the LPG engine generator 121, a system for automatic synchronization, automatic parallel operation, and automatic load sharing. In addition, the DC switchboard 122 can be installed with a handrail and an insulation mat, and is installed to satisfy the IP22 standard in a drip-proof type.

In addition, the DC switchboard 122 includes a power management control panel 122-1 that controls the power generated by the LPG engine generator 121, and a hotel load inverter 122-2 that supplies load power within the hull 100. ) and a propulsion motor inverter 122-3 for supplying power to the propulsion unit 110.

The power management control panel 122-1 is composed of a Power Management System (PMS), and is a system capable of monitoring and regulating power consumption to predict power use and make necessary adjustments. Of course, the power management control panel 122-1 may be controlled by a dedicated program.

The hotel load inverter 122-2 is configured to supply basic electricity required for operating the ship, electricity required for accommodation for the ship's crew, and basic power used for various driving auxiliary equipment required for operation.

The propulsion motor inverter 122-3 is configured as a device that converts DC and AC to supply power to the propulsion unit 110.

The power management control panel 122-1 is connected to the LPG engine generator 121, the battery unit 130, the hotel load inverter 122-2 and the propulsion motor inverter 122-3, so that the LPG engine generator 121, the battery unit 130, the hotel load inverter 122-2, and the propulsion motor inverter 122-3 can be monitored and controlled.

The power conversion filter 123 is installed on one side of the engine part 120, and noise is generated when direct current and alternating current are generated by the power conversion device 125, which will be described later, and is a filter for removing the noise. It consists of

The nitrogen exhaust device 124 is installed on one side of the engine part 120 and is provided to discharge the liquefied petroleum gas to the outside. When an abnormality occurs in the LPG engine generator 121, the nitrogen discharge device 124 may cut off fuel supply using a valve. At this time, the liquefied petroleum gas remains in the tank connection part 320 to be described later. The nitrogen discharge device 124 is composed of a system that discharges the liquefied petroleum gas to the outside using nitrogen.

The power converter 125 includes a power converter used in the LPG engine generator 121, a power converter used in the battery unit 130 to be described later, and a power converter for AC 220V power supply. The power converter 125 converts AC power generated from the LPG engine generator 121 into DC power to supply power to the propulsion power and the DC distribution electric propulsion line 10 . The power converter 125 can supply propulsion power for boosting by the battery unit 110 to be described later and supply propulsion power for turning in an emergency. The power converter 125 may convert DC power from the DC BUS into AC power to supply power to the DC distribution electric propulsion line 10 . In addition, the power converter 125 has a function of storing power in the battery unit 130 to be described later. All of the power conversion devices 125 are provided in plurality, and are installed as devices that satisfy the regulations for limiting harmonics and are preferably approved by the Society.

The governor 126 is composed of a mechanical device capable of constantly adjusting the rotational speed according to the increase or decrease of the load in the LPG engine generator 121. Therefore, the governor 126 controls the rotational speed of the LPG engine generator 121 according to the amount of power required by the propulsion unit 110, thereby reducing fuel consumption.

More specifically, the governor 126 detects the amount of power of the propulsion unit 110 and determines whether the amount of power is within a reference range. Next, the governor 126 determines whether the measured power amount is greater than or equal to a reference value. At this time, if the measured amount of power is equal to or greater than the reference value, the governor 126 increases the rotational speed of the LPG engine generator 121 to lower the amount of power to fall within the reference range, and conversely, if the measured amount of power is equal to or less than the reference value , The rotational speed of the LPG engine generator 121 may be reduced to increase the amount of power to fall within the reference range.

As a result, the governor 126 controls the number of rotations of the LPG engine generator 121 according to the amount of power required for the propulsion unit 110, thereby generating electricity from the LPG engine generator 121 as much as the required amount of power, thereby unnecessary This will reduce power consumption.

In addition, the hull 100 is provided at the innermost front of the hull 100, and includes a battery unit 130 supplying power to start the engine unit 120.

More specifically, referring to FIG. 5 , the battery unit 130 includes a lithium ion battery 131 that supplies power to start the LPG engine generator and a battery that suppresses a fire generated in the lithium ion battery 131. It is a configuration that includes a fire suppression device 132, and is an area where a device for supplying power is located.

The lithium ion battery 131 is provided to simultaneously supply the required power of the propulsion power and the DC distribution electric propulsion line 10 together with the LPG engine generator 121 . The lithium ion battery 131 is configured to be charged by land electricity. The lithium ion battery 131 may be provided in plurality, and when cooling the lithium ion battery 131, it may be cooled by air cooling. At this time, the air cooling type may be, for example, air flow by an air conditioner installed inside the hull 100.

In addition, the lithium ion battery 131 may maintain the temperature of the lithium ion battery 131 within a certain range by installing an air conditioner (not shown) in the center of the lithium ion battery 131 .

In addition, the lithium ion battery 131 may include a battery management system, and measures values such as current, voltage, and temperature of the lithium ion battery 131 to efficiently manage the lithium ion battery 131. Charging and discharging status can be monitored.

The battery fire suppression device 132 is installed adjacent to the lithium ion battery 131 and is composed of a device for suppressing a fire occurring in the lithium ion battery 131 . More specifically, when a fire occurs in the lithium ion battery 131, the battery fire suppression device 132 may directly spray the lithium ion battery 131 to suppress the fire. In addition, the battery fire suppression device 132 may discharge gas generated when a fire occurs in the lithium ion battery 131 to the front of the hull 100 using the discharge fan.

Next, referring to FIGS. 1 to 4 , a cabin 200 provided at the front upper portion of the hull 100 is provided. The cabin 200 corresponds to a structure having a steering device capable of controlling the DC distribution electric propulsion ship 10 and a cabin used by a crew member. The cabin 200 is located in the front center of the hull 100, and has a watertight window and a watertight door so that seawater does not flow into the cabin 200.

In addition, the cabin 200 includes an energy management control panel 201 for monitoring and controlling the power generated by the LPG engine generator 121.

The energy management control panel 201 is composed of an energy management system (EMS), and is a system capable of setting energy efficiency improvement targets and optimizing energy use. Of course, the energy management control panel 201 may be managed as a dedicated program to manage energy use.

The energy management control panel 201 is connected to the power management control panel 122-1, and includes the power management control panel 122-1, the LPG engine generator 121, the battery unit 130, and the hotel load inverter 122. -2) and the state of the propulsion motor inverter 122-3 can be monitored and controlled.

In addition, the cabin 200 includes a mast 210 installed vertically on top of the cabin 200 . The mast 210 is formed as a column erected vertically on the center line of the cabin 200, and is provided to attach a sail or hoist a signal. In addition, the mast 210 may be additionally installed with a support in a horizontal direction, and various communication equipment may be installed there.

In addition, the cabin 200 is installed adjacent to the mast 210 and includes an antenna 220 capable of transmitting and receiving radio waves. The antenna 220 is provided to enable wireless communication using satellites. The antenna 220 is formed in a dish-like shape and installed vertically in the same manner as the mast 210 . Of course, the antenna 220 may be installed in plurality at the top of the cabin 200 so that more stable communication can be achieved.

In addition, the cabin 200 is installed on the top of the cabin 200, and includes a lighting unit 230 that illuminates the front view. The lighting unit 230 serves to illuminate the front view of the crew member who maneuvers inside the cabin 200 at night, and is installed to be rotatable at the top of the cabin 200. Of course, the lighting unit 230 may be installed in plurality to provide a brighter field of view. In addition, of course, the lighting unit 230 is provided in a waterproof type so that it can be used even in a state exposed to seawater. At this time, it is preferable that the waterproof type specifically satisfies the IP56 rating.

Next, referring to FIGS. 1 to 4 , an accommodating portion 300 provided at a rear upper portion of the hull 200 and receiving fuel therein is provided. The accommodating part 300 is configured to supply liquefied petroleum gas to the engine part 120.

More specifically, the accommodating part 300 is an LPG fuel tank 310 in which the liquefied petroleum gas is accommodated, and the LPG fuel tank 310 so that the liquefied petroleum gas can be transferred to the engine unit 120 And is connected to the tank connection portion 320 and the tank connection portion 320 to one side connecting the engine portion 120, the liquefied petroleum gas from the LPG fuel tank 310 along the tank connection portion 320 It has a configuration including a fuel supply device 330 to be supplied to the engine unit 120, and is a zone where a device capable of supplying liquefied petroleum gas is located.

The LPG fuel tank 310 is installed on one side of the accommodating part 300 and is formed in a hollow shape with an empty interior so that the liquefied petroleum gas can be accommodated therein. The LPG fuel tank 310 is formed of a stainless steel (stainless steel) material, and a pipe formed of stainless steel (stainless steel) is installed inside the LPG fuel tank 310 as well.

The tank connection part 320 is installed on one side of the accommodating part 300, so that the liquefied petroleum gas accommodated in the LPG fuel tank 310 can be transferred to the engine part 120, the LPG fuel tank 310 and the engine part 120 are connected. The tank connection part 320 has a form in which a plurality of pipes are installed inside the hull 100.

The fuel supply device 330 is connected to the tank connection part 320 to one side so as to supply the liquefied petroleum gas to the engine part 120. The fuel supply device 330 allows the liquefied petroleum gas fuel to be supplied in a liquid state. In addition, the fuel supply device 330 includes, of course, a fuel pump for transferring the liquefied petroleum gas to the engine unit, and similarly may be provided in plurality.

In addition, the accommodating part 300 may further include an LPG sensor (not shown). The LPG detector is installed on one side of the hull 100, and when the liquefied petroleum gas leaks from the receiving part 300, detects the liquefied petroleum gas, and causes the discharge fan (not shown) to operate The liquefied petroleum gas is discharged to the rear of the hull 100.

Therefore, in summary, the engine unit 120 generates power using the liquefied petroleum gas supplied through the accommodating unit 300 as fuel, and the propulsion unit 110 generates power generated in the engine unit 120. By being operated with electric power, it is possible to propel the hull 100 in a hybrid method using the liquefied petroleum gas and electric power.

In other words, the LPG engine generator 121 generates power by operating the engine using the liquefied petroleum gas supplied through the tank connection 320 as fuel, and the propulsion motor connected to the propulsion device 111 ( 112) is operated with the power generated by the LPG engine generator 121, thereby propelling the hull 100 in a hybrid method combining the liquefied petroleum gas and electric power.

At this time, the propulsion unit 110, the engine unit 120, and the battery unit 130 are formed as a DC-based power system. Therefore, the DC distribution electric propulsion line 10 is operated at a variable frequency, so that energy efficiency can be improved and fuel consumption can be reduced.

In addition, the present invention is characterized by a system for supplying the main power source of the DC distribution electric propulsion line 10 by operating the LPG engine generator 121 and the battery unit 130 alone or in parallel.

As such, it will be understood that the technical configuration of the present invention described above can be implemented in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art to which the present invention belongs.

Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their All changes or modified forms derived from equivalent concepts should be construed as being included in the scope of the present invention.

10: DC distribution electric propulsion line
100: hull
101: buffer material
102: protector
103: guardrail
110: propulsion unit
111: propulsion device
112: propulsion motor
120: engine department
121: LPG engine generator
121-1: expansion tank
121-2: fuel inlet
121-3: Sea water outlet
121-4: oil filter
121-5: Sea water inlet
121-6: Combustion air inlet
121-7: engine oil outlet
121-8: Exhaust gas outlet
121-9: control box
122: DC switchboard
122-1: power management control panel
122-2: Hotel load inverter
122-3: propulsion motor inverter
123: power conversion filter
124: nitrogen exhaust device
125: power converter
126: governor
127: DC choke
130: battery unit
131: lithium ion battery
132: battery fire suppression device
200: cabin
201: energy management control panel
210: mast
220: antenna
230: lighting unit
300: container part
310: LPG fuel tank
320: tank connection
330: fuel supply device

Claims (5)

A hull that can be moved while afloat;
a cabin provided in the front upper portion of the hull; and
A storage unit provided at the rear upper portion of the hull and containing fuel therein;
the hull,
a propulsion unit for imparting a driving force to the hull;
an engine unit generating electric power required to operate the propulsion unit; and
A battery unit supplying power to start the engine unit; includes,
The propulsion unit, the engine unit and the battery unit are DC distribution electric propulsion lines, characterized in that formed in a DC-based power system.
According to claim 1,
The organ department,
LPG engine generators provided in plurality to convert liquefied petroleum gas into electric power by operating an engine using liquefied petroleum gas as fuel; and
A governor provided adjacent to the LPG engine generator and controlling the LPG engine generator; including,
The governor controls the rotational speed of the LPG engine generator according to the amount of power required by the propulsion unit, so that fuel consumption can be reduced.
According to claim 2,
The organ department,
It further includes; a DC switchboard provided on one side of the hull and forming a connection point of a DC electric circuit,
The DC switchboard,
a power management control panel controlling the power generated by the LPG engine generator;
a hotel load inverter supplying load power within the hull; and
Including; propulsion motor inverter for supplying power to the propulsion unit,
The power management control panel,
DC distribution electricity characterized in that it is connected to the LPG engine generator, battery unit, hotel load inverter and propulsion motor inverter to monitor and control the status of the LPG engine generator, battery unit, hotel load inverter and propulsion motor inverter. propulsion line.
According to claim 3,
The cabin,
Including; energy management control panel for monitoring and controlling the power generated by the LPG engine generator,
The energy management control panel,
DC distribution electric propulsion line, characterized in that connected to the power management control panel, capable of monitoring and controlling the states of the power management control panel, LPG engine generator, battery unit, hotel load inverter, and propulsion motor inverter.
According to claim 2,
The LPG engine generator,
An expansion tank provided to prevent air intrusion;
A fuel inlet through which the liquefied petroleum gas can be injected or discharged;
Sea water outlet through which sea water is discharged;
An oil filter to purify impurities in engine oil;
a seawater inlet through which the seawater flows;
a combustion air inlet through which air is supplied for combustion of the liquefied petroleum gas;
An engine oil outlet through which the engine oil is discharged;
Exhaust gas outlet through which exhaust gas is discharged; and
A DC distribution electric propulsion line comprising a; control box for controlling the operation of the seawater outlet and seawater inlet according to the load of the LPG engine generator.

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