KR20170011758A - Liquefied Fuel Gas Supply System - Google Patents

Abstract

The present invention relates to a liquefied fuel gas supply system which prevents a user from being exposed to liquefied fuel gas when the user repairs a heating unit. According to the present invention, the liquefied fuel gas supply system comprises: a heating module including the heating unit which receives heat from a heat source and heats a heat medium, a heat exchange unit which receives supply of the heat medium heated by the heating unit and transfers heat, and a heat medium pump which re-supplies the heat medium, having passed through the heat exchange unit and exchanged heat, to the heating unit; a fuel supply module including a liquefied fuel pump, which supplies the liquefied fuel gas stored in a liquefied fuel gas tank to the heat exchange unit and enables the liquefied fuel gas to receive heat of the heat medium and flow to an engine, and a liquefied fuel motor which drives the liquefied fuel pump; a first housing having the heating unit, the heat medium pump, and the liquefied fuel pump motor; and a second housing having the heat exchange unit and the liquefied fuel pump.

Description

[0001] Liquefied Fuel Gas Supply System [0002]

The present invention relates to a liquefied natural gas (LNG) supply system, and more particularly, to a liquefied natural gas (LNG) supply system that includes a vaporizer capable of vaporizing liquefied natural gas, a heating unit that applies heat to a heating medium supplied to the vaporizer, The present invention relates to an invention that allows an operator to perform maintenance in a relatively safe area.

Liquefied natural gas (LNG), which is a representative liquefied fuel gas, is a colorless transparent cryogenic liquid that reduces the volume of methane-based natural gas to -163 ° C and reduces its volume by one-sixth. In order to utilize these liquefied fuel gas as energy, a transportation method capable of mass transportation from the production base to the demand area has been studied. As a part of this effort, a liquefied fuel gas carrier capable of transporting a large amount of liquefied fuel gas by sea Was developed.

Generally, the vaporized fuel gas is liquefied and transported from the mountain to the consumer. The liquefied fuel gas such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) is smaller in volume than the vaporized fuel gas, and thus can improve transportation efficiency.

In recent years, the number of LNG-fueled vessels has greatly increased in the field of natural gas carriers.

LNG propulsion vessels can save 35% of fuel costs compared to heavy fuel oil vessels, and they are also considered to be the future of shipbuilding industry.

Here, the LNG fuel propulsion vessel is required to vaporize the liquefied fuel gas to use the liquefied fuel gas as fuel, and a vaporizer is provided for the liquefied fuel gas.

In addition, a heating unit capable of providing heat to the vaporizer is provided. In the past, such equipment has been exposed to a risk when the operator carries out maintenance due to the vaporizer being exposed to the liquefied fuel gas in a space.

Thus, in the event of a malfunction in the vaporizer or heating device, it may be necessary to move the vessel to a safe area dock and repair the device, thereby resulting in operational costs.

Also, if the repair of the device is delayed due to various external conditions, there is a risk of accidents due to tank explosion.

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems of the prior art described above, and has as its object to provide a vaporizer and a heating unit independently so that the operator is not exposed to the liquefied fuel gas when the heating unit is being repaired.

In addition, the system is provided in a space limited vessel, and a space method can be maximized.

The problems of the present invention are not limited to the above-mentioned problems, and another problem that is not mentioned can be clearly understood by a person skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquefied fuel gas supply system including a heating unit that receives heat from a heat source and heats a heating medium, a heat exchange unit that receives heat from the heating medium heated by the heating unit, A liquefied fuel pump for supplying the liquefied fuel gas stored in the liquefied fuel gas tank to the heat exchanger to transfer the liquefied fuel gas to the engine by receiving the heat of the heat medium, And a liquefied fuel pump for driving the liquefied fuel pump, a first housing in which the heating unit, the heating medium pump and the liquefied fuel pump motor are housed, and a second housing in which the heat exchange unit and the liquefied fuel pump are housed And a second housing.

The fuel supply module may further include a rotating shaft that is provided to penetrate the first housing and the second housing and transmits the power generated from the liquefied fuel motor to the liquefied fuel pump.

The apparatus may further include a sealing device that seals a portion of the rotating shaft that contacts the first housing and the second housing.

The fuel supply module may include a plurality of liquefied fuel pumps and may be arranged in a plurality of layers.

Further, the liquefied fuel pump may further include a lift device at a lower end of the liquefied fuel pump provided at the upper portion thereof.

Further, the at least one of the first housing and the second housing may further include an LNG gas leakage detection system.

The natural liquefied gas supply apparatus of the present invention for solving the above-mentioned problems has the following effects.

First, the vaporizer exposed to natural liquefied gas is provided independently of other equipment, so that the operator can secure stability when performing maintenance of equipment such as a motor.

Secondly, there is an advantage that the worker can work in the place where the maintenance is needed by using the separated space precisely.

Third, the liquefied fuel gas supply system can be miniaturized because a space can be secured by disposing the liquefied fuel pump in a multi-layered structure.

Fourth, there is an advantage that a liquefied fuel pump motor provided around a vaporizer through which liquefied fuel gas passes is separated from a vaporizer, thereby avoiding the use of an expensive explosion-proof liquefied fuel pump motor, thereby saving costs.

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

1 is a view showing an entire structure of a liquefied fuel gas supply system according to a first embodiment of the present invention.
Fig. 2 shows a sealing device in a portion where a rotating shaft and a rotating shaft between the liquefied fuel pump motor and the liquefied fuel pump in the liquefied fuel gas supply system according to the first embodiment of the present invention pass through and contact the first housing and the second housing FIG.
3 is a view showing an entire structure of a liquefied fuel gas supply system according to a second embodiment of the present invention.
4 is a view showing that a liquefied fuel pump is provided in a multilayer in the liquefied fuel gas supply system according to the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

Furthermore, the terms used in the present invention are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present invention, the term "comprises" or "having ", etc. is intended to specify that there is a feature, number, step, operation, element, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

First Embodiment

1 is a view showing an entire structure of a liquefied fuel gas supply system according to a first embodiment of the present invention.

1, the liquefied fuel gas supply system according to the first embodiment of the present invention includes a heating module 100, a fuel supply module 200, a first housing 300, and a second housing 400 .

The heating module 100 includes a heating unit 110 for receiving heat from a heat source H and heating the heating medium and a heat exchange unit 120 for receiving heat from the heating unit 110 and transferring heat thereto . And a heating medium pump 130 for supplying the heat-exchanged heat medium through the heat exchanging unit 120 to the heating unit 110 again.

Here, the heating unit 110 receives a heat source from the outside or externally emits heat to heat the heating medium.

The heating medium should generally be a fluid, be suitable for a wide range of temperatures, and be thermally stable. In addition, the temperature, viscosity, fluidity, toxicity, suitability with the system and accessories should be carefully examined depending on the application.

More specifically, since the viscosity of the heating medium is variable depending on the temperature, operation at the remaining temperature should be carefully considered when calculating the pump capacity.

When the viscosity of the heat medium is increased, the fluidity is deteriorated (flow rate is lowered) and convection defects can promote premature aging due to local heating. When viscosity is lowered, circulation is good but volatility is high. .

Further, in order to obtain a heat transfer coefficient when the heating medium flows on the inner surface of the heating part, the flow must be fast in a turbulent state and designed to maintain a constant flow rate. It is advantageous that the general flow rate is 1.5 to 3 m / sec at less than 300 ° C and more than 3 m / sec at 300 ° C or more. In order to avoid local overheating and promote continuous heat transfer, it is possible to avoid heating directly to the flow path of the heating unit 110.

As described above, the heating medium may be selected from materials that circulate through the heating unit 110 and the heat exchanging unit 120, which will be described later, and it is not limited thereto.

In the present embodiment, the heating medium heated by the heating unit 110 passes through the heat exchanging unit 120 and transfers heat required for vaporizing the liquefied fuel gas in a liquefied state.

That is, the heat exchanging unit 120 is a device that allows heat to be exchanged between two fluids. In a broad sense, it includes heaters, coolers, and condensers, but generally refers to the purpose of recovering heat.

Here, the heat exchanging unit 120 receives the liquefied fuel gas to be described later from the liquefied fuel tank T, and the liquefied fuel gas that has been cooled by the heat of the heat medium described above is heated and evaporated accordingly.

The flow of the liquefied fuel gas through the heat exchanging unit 120 from the liquefied fuel tank T will be described later.

In the present embodiment, the heating medium pump 130 serves to supply the heating medium 110, which has been heat-exchanged through the heat exchanging unit 120, to the heating unit 110 again.

The fuel supply module 200 includes a liquefied fuel pump 220 for supplying the liquefied fuel gas stored in the liquefied fuel tank to the heat exchanger 120 and a liquefied fuel pump motor 230 for driving the liquefied fuel pump 220 do.

The liquefied fuel pump 220 serves to supply the liquefied fuel from the liquefied fuel tank T provided in the liquefied fuel gas carrier to the heat exchanger 120 unlike the heat medium pump 130 described above.

The liquefied fuel pump motor 230 drives the liquefied fuel pump 220.

Here, the liquefied fuel pump motor 230 and the liquefied fuel pump 220 are provided in different spaces, respectively. Detailed description and effects thereof will be described later.

It goes without saying that the position of the liquefied fuel tank T is not limited to a specific position.

The first housing 300 includes the heating unit 110, the heating medium pump 130 and the liquefied fuel pump motor 230. The second housing 400 includes the heat exchanging unit 120 and the liquefied fuel A pump 220 is provided.

In this embodiment, since the first housing 300 and the second housing 400 are separately provided, the operator can safely perform maintenance work or the like in the corresponding area.

Specifically, the heat exchanger 120 provided in the second housing 400 serves to vaporize the liquefied fuel gas transferred from the liquefied fuel tank T through the liquefied fuel pump 220, as described above.

Accordingly, there is a risk that the liquefied fuel gas may leak to the outside of the heat exchanging unit as the heat exchanging unit 120 is exposed to the liquefied fuel gas.

As an example, liquefied fuel gas is liquefied natural gas collected from a gas field, and methane is the main component.

Liquefied fuel gas is a colorless transparent liquid. It is a very good fuel because it has almost no pollutants like LPG and it has a high calorific value. Methane, which is the main component of natural gas, is lighter than air (specific gravity of air: 0.6) It can become an explosive gas.

Therefore, the heat exchanging unit 120 and the liquefied fuel pump 220, which are exposed to the liquefied fuel gas having the above-described risk, are provided in the second housing 400.

On the other hand, the heating unit 110 and the liquefied fuel pump motor 230 may be provided in the first housing 300 which is more secure than the second housing 400, thereby facilitating access to the equipment when a problem occurs.

If the heat exchange unit 120, the liquefied fuel pump 220, and the liquefied fuel pump motor 230 are provided in the same space as in the prior art, the liquefied fuel pump 220 and the liquefied fuel pump motor (230) are to be equipped with an expensive explosion-proof pump and a motor.

Therefore, if the liquefied fuel pump 220 and the liquefied fuel pump motor 230 are separately provided in the first housing 300 and the second housing 400, expensive equipment is not required.

More specifically, the liquefied fuel pump motor 230 provided in the second housing 400 is not exposed to the liquefied fuel gas, and an expensive explosion-proof motor may not be used, .

Alternatively, a configuration may be adopted in which a partition is provided in a single housing so that the mutually isolated spaces on both sides are used as the first housing 300 and the second housing 400, respectively.

In this embodiment, at least one of the first housing 300 and the second housing 400 may further include a gas leakage detection system 600.

The gas leakage detection system 600 may be installed at a position where the liquefied fuel pump motor 230 is located in the first housing 300 or at a position where the liquefied fuel pump 220 or the heat exchange unit 120 is located in the second housing 400 Can be installed.

Accordingly, gas leaking to the outside of the liquefied fuel pump motor 230, the liquefied fuel pump 220, and the heat exchange unit 120 can be sensed.

When the liquefied fuel gas leaks, the function of notifying the gas leakage by the alarm sound or voice may be used to prevent the explosion or the suffocation by the gas in advance.

2 is a schematic view illustrating a rotating shaft 500 and a rotating shaft 500 between the liquefied fuel pump motor 230 and the liquefied fuel pump 220 in the liquefied fuel gas supply system according to the first embodiment of the present invention. And a sealing device 510 at a portion contacting and contacting the second housing 400. FIG.

As shown in FIG. 2, in the fuel supply module 200 of the liquefied fuel gas supply system according to the first embodiment of the present invention, the first housing 300 and the second housing 400 are provided to penetrate the liquefied fuel And a rotation shaft 500 for transmitting the power generated by the pump motor 230 to the liquefied fuel pump 220. [

The apparatus may further include a sealing device 510 that seals a portion of the rotary shaft 500 that contacts the first housing 300 and the second housing 400.

The first housing 300 having the heating unit 110, the heating medium pump 130 and the liquefied fuel pump motor 230 and the second housing 300 having the heat exchanging unit 120 and the liquefied fuel pump 220 The liquefied fuel pump 220 provided in the second housing 400 receives driving force from the liquefied fuel pump motor 230 in the first housing 300.

The rotating shaft 500 may be provided to connect the liquefied fuel pump motor 230 and the liquefied fuel pump 220 and transmit the driving force between the first housing 300 and the second housing 400 independently provided .

At this time, the liquefied fuel pump motor 230 provided in the first housing 300 and the liquefied fuel pump 220 provided in the second housing 400 are advantageously disposed closer to each other to transmit power.

Since the rotary shaft 500 for connecting the liquefied fuel pump motor 230 and the liquefied fuel pump 220 and transmitting the power is provided in the first housing 300 and the second housing 400, A portion of the first housing 300 and the second housing 400 where the rotary shaft 500 is in contact is pierced.

In the first embodiment of the present invention, when the liquefied fuel gas is leaked from the liquefied fuel pump or the heat exchanger provided in the second housing 400 as the portion contacting the above-mentioned penetrated, the second housing 400, There is a risk of leaking liquefied fuel gas to the outside.

In addition, it is advantageous to provide a separate sealing device 510 at the portion through which the rotating shaft 500 penetrates since the leaked liquefied fuel gas must be prevented from flowing into the first housing 300.

Here, the sealing device 510 is provided at a portion where the first housing 300 and the second housing 400 are in contact with the rotary shaft 500. The sealing device 510 may be in the form of a first housing 300 and a second housing 400, And may be implemented in various forms within a range that serves to shut off the display unit 400 from the outside.

As described above, the liquefied fuel gas supply system according to the first embodiment of the present invention has been described in detail, and other embodiments of the present invention will be described below.

Second Embodiment

FIG. 3 is a view showing an overall configuration of a liquefied fuel gas supply system according to a second embodiment of the present invention, and FIG. 4 is a schematic view of a liquefied fuel gas supply system in a liquefied fuel gas supply system according to a second embodiment of the present invention And is provided in a multi-layered structure.

3 and 4, the liquefied fuel gas supply system according to the second embodiment of the present invention includes a heating module 100, a fuel supply module 200, a first housing 300 and a second housing 400 ).

Here, the heating module 100, the fuel supply module 200, the first housing 300, and the second housing 400 are provided in the same manner as in the first embodiment described above, The module 200 differs from the first embodiment in that a plurality of liquefied fuel pumps 220 are provided.

Specifically, in the case of this embodiment, a plurality of liquefied fuel pumps 220 are provided and are arranged in a multi-layered structure. That is, a plurality of the liquefied fuel pumps 220 may be provided.

The liquefied fuel pump 220 can also deliver more liquefied fuel gas as needed. The liquefied fuel pump 220 uses a liquefied fuel pump 220 in which failure does not occur when a failure occurs, There is an effect of not turning off.

When a plurality of pumps are provided, it is advantageous that the space is more efficiently used by arranging the liquefied fuel pump 220 in a multi-layered structure. When the operator is arranged in a multi-layer structure when the liquefied fuel pump 220 is maintained The lower end face of the liquefied fuel pump 220 can be seen and more precise maintenance is possible.

In addition, since the liquefied fuel pump 220 is not arranged in the same plane, it is possible to miniaturize the space in which the liquefied fuel pump 220 is provided.

Here, the liquefied fuel pump 220 provided in a multi-layered structure may further include a lift device at the lower end of the liquefied fuel pump 220 provided at the upper part.

Although not shown in the figure, the liquefied fuel pump 220 provided at the upper part of the liquefied fuel pump 220 disposed at the upper part of the liquefied fuel pump 220 can be moved up and down So that the operator can move and maintain the liquefied fuel pump 220, thereby enabling a more efficient operation.

Needless to say, the lifting device capable of moving the liquefied fuel pump 220 up and down may be variously formed.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. . Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: heating module 110:
120: heat exchanger 130: heating medium pump
200: fuel supply module 220: liquefied fuel pump
230: liquefied fuel pump motor 300: first housing
400: second housing 500: rotating shaft
510: Sealing device 600: Gas leak detection system

Claims (6)

A heating unit which receives heat from a heat source and heats the heating medium; a heat exchange unit which receives the heating medium heated by the heating unit and transfers heat; and a heating medium pump which supplies the heat- module;
A liquefied fuel pump for supplying the liquefied fuel gas stored in the liquefied fuel gas tank to the heat exchanging unit so that the liquefied fuel gas receives heat of the heat medium and flows to the engine, and a liquefied fuel motor for driving the liquefied fuel pump ;
A first housing in which the heating unit, the heating medium pump, and the liquefied fuel pump motor are housed; And
A second housing in which the heat exchange unit and the liquefied fuel pump are accommodated;
The liquefied fuel gas supply system comprising: The method according to claim 1,
The fuel supply module
Further comprising: a rotating shaft that penetrates the first housing and the second housing and transmits a power generated by the liquefied fuel motor to the liquefied fuel pump. 3. The method of claim 2,
Further comprising: a sealing device for sealing a portion of the rotating shaft which passes through and contacts the first housing and the second housing. The method according to claim 1,
The fuel supply module includes a plurality of liquefied fuel pumps,
Liquefied fuel gas supply system. 5. The method of claim 4,
Wherein the liquefied fuel pump further comprises a lift device at a lower end of the liquefied fuel pump provided at an upper portion thereof. The method according to claim 1,
Wherein at least one of the first housing and the second housing further comprises a gas leakage detection system.

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