KR101941608B1 - MEGI protecting type gas valve train - Google Patents

Abstract

The present invention relates to an engine-protected gas valve train, comprising: a filter connected to a MEGI piping side or a FGS piping side connected to a methane path of a gas valve train; And a differential pressure sensor formed at both ends of the filter to measure a differential pressure between both ends of the filter while blocking the foreign matter contained in the inlet fuel gas in the methane path from the filter to obtain a replacement or repair signal of the filter .
According to the present invention, it is possible to prevent the filter installed in the gas valve train from being damaged due to an unexpected accident, thereby eliminating the risk factor on the MEGI side and returning the high-pressure fuel gas to the engine after shutdown. The present invention provides an engine-protected gas valve train that prevents fatigue damage to the engine.

Description

[0001] The present invention relates to an engine protection gas valve train,

The present invention relates to an engine-protected gas valve train, comprising: a filter connected to a MEGI piping side or a FGS piping side connected to a methane path of a gas valve train; And a differential pressure sensor formed at both ends of the filter to measure a differential pressure between both ends of the filter while blocking the foreign matter contained in the inlet fuel gas in the methane path from the filter to obtain a replacement or repair signal of the filter .

In recent years, the consumption of liquefied gas such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) has been rapidly increasing worldwide. Especially, Liquefied Natural Gas (LNG) It is an eco-friendly fuel with low emission of pollutants and its use is increasing in various fields.

A ship is a means of transporting large quantities of minerals, crude oil, natural gas, or more than a thousand containers. It is made of steel and buoyant to float on the water surface. ≪ / RTI >

Such a vessel generates thrust by driving the engine. In this case, the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, so that the shaft connected to the crankshaft is rotated to drive the propeller It was common.

In recent years, however, LNG fuel supply systems for driving an engine using LNG as a fuel have been used in an LNG carrier carrying Liquefied Natural Gas (LNG) It is also applied to other ships.

Liquefied natural gas (hereinafter referred to as "LNG") is a colorless transparent liquid obtained by cooling methane-based natural gas to about -162 ° C. and liquefying it. / 600. ≪ / RTI > Therefore, it is very efficient to transport liquefied LNG when transporting natural gas. For example, an LNG carrier that can transport (transport) LNG is used.

As international standards for vessels and regulatory standards for each country are becoming increasingly sophisticated, there is a growing interest in ships that are environmentally friendly and highly efficient. One of them is the DFDE engine, which can be used as fuel for natural gasification or forced vaporization of LNG (Dual Fuel Diesel Electric) have been developed and applied to ships.

LNG (LNG Fueled Ship), which uses LNG as fuel, is expected to become more active in the construction and operation of LFS by strengthening emission regulation standards of international vessels and maintaining the price stability of LNG.

As a propulsion engine (ME) for LNG carriers, ME-GI (Man Electric Gas Injection) engine driven by LNG as fuel is applied. It is developed to reduce NOx and SOx emissions. .

When ME-GI, a 2-stroke high-pressure natural gas injection engine capable of using gas and oil as fuel, is applied, compressed gas of 150 to 400 bar is supplied as fuel, so that a device for boosting and vaporizing LNG And a fuel supply unit FGS provided with a compression device for compressing BOG at a high pressure. Prior Art Patent 10-2014-0096596 " Fuel supply system and method for marine engine "

The fuel supply line FL for connecting the FGS and the MEGI to the LNG or BOG is formed to pass through the gas valve train (gas valve train) as shown in FIG.

A number of valves are installed in the fuel supply line that connects the FGS and the MEGI to safely control the fuel supply. The GVU ((Gas Valve Unit) It is a separate valve assembly that connects the nitrogen supply line inside the fuel supply line and collects the control valve to secure the safety when the situation such as engine shutdown occurs.

Looking at the basic operation of the gas valve train with Figure 2, the MEGI shutdown quickly air-vents the remaining methane in the fuel supply line to ensure vessel safety.

Nitrogen, which is an inert gas, is used for the air vents. Nitrogen is pushed in at the MEGI shutdown to vent the residual gas inside the MEGI fuel supply line, the FGS fuel supply line, and the gas valve train.

The present applicant has filed a patent application No. 10-2016-0038343 '1-block gas valve train', but it is necessary to solve the problems found in the development of the 1-block gas valve train.

That is, when the gas valve train is operated, the fuel gas contains a very large amount of foreign matter, which may flow into the MEGI side and cause a serious engine failure.

In order to prevent this, a filter is installed in the gas valve train. In many cases, the filter is damaged due to unexpected accident, which poses a risk to the MEGI side.

In addition, the conventional gas valve train suffers from fatigue damage inside the engine because the high-pressure fuel gas is pushed into the MEGI after shutdown.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prevent a filter installed on a gas valve train from being damaged by an accident, thereby eliminating a risk factor on the MEGI side, Which is prevented from causing fatigue damage inside the engine because it is pushed into the MEGI.

In order to achieve the above-mentioned object, the present invention provides a pipeline for connecting MEGI and FGS, comprising a methane path 10 in which an external MEGI piping 51 and an FGS piping 53 are connected at both ends; A nitrogen supply path 30 connecting the nitrogen inlet pipe 50 to the methane passage 10; A vent path 20 connecting the vent pipe 52 to the methane path 10 and valves installed in the methane path 10 and the nitrogen supply path 30 and the vent path 20, And a filter connected to the side of the MEGI piping (51) connected to the methane path (10) or the side of the FGS piping (53) connected to the methane path (10) And a differential pressure meter 700 formed at both ends of the filter 70. The foreign matter contained in the incoming fuel gas in the methane passage 10 is blocked by the filter 70, Measuring differential pressure across both ends to obtain a filter replacement or repair signal; A protective valve 80 formed at a portion connected to the MEGI pipe 51 and an orifice 800 connecting both ends of the protective valve 80 to prevent the orifice 800), and then opening the protective valve (80) to supply the fuel gas, thereby protecting the MEGI from the fuel injection shock; As a technical feature thereof.

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According to the present invention, it is possible to prevent the filter installed in the gas valve train from being damaged due to an unexpected accident, thereby eliminating the risk factor on the MEGI side and returning the high-pressure fuel gas to the engine after shutdown. The present invention provides an engine-protected gas valve train that prevents fatigue damage to the engine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Fig. 2 is a view showing an installation position and operating block diagram of the gas valve train
3 is a schematic diagram of a basic piping structure of a gas valve train
FIG. 4 is a schematic view of an improved piping structure for an internal vent in FIG.
5 is a schematic view of a piping structure applied to an embodiment of the present invention.
6 is a perspective view of a gas valve train '

Hereinafter, the present invention will be described with reference to the drawings. In the following description of the present invention, a detailed description of related arts or configurations will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured will be.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be exemplary, self-explanatory, allowing for equivalent explanations of the present invention.

FIG. 3 is a basic piping structure of a gas valve train. FIG. 4 is an enlarged view of an internal vent of the gas valve train of FIG. FIG. 5 is a piping structure diagram applied to an embodiment of the present invention, and FIG. 6 is a perspective view of a gas valve train '.

As shown in the drawings, the present invention relates to a gas valve train, and in order to achieve the above object, the present invention provides a gas valve train comprising: a filter 70 included in a methane path 10 of a gas valve train; A differential pressure meter 700 and a protection valve 80; And an orifice 800.

For purposes of explanation of the present invention, the functions and terminology of the gas valve train will be summarized together with FIG.

[Terminology]

MEGI: LNG marine engine

FGS: Fuel gas system

Methane route (10): A pipeline connecting MEGI and FGS. External MEGI piping (51) and FGS piping (53) are connected at both ends.

A first valve 11 formed in the direction of the MEGI piping 51 and a second valve 11 formed in the direction of the FGS piping 53. The methane path control valve 100 includes: Two valves (12).

Nitrogen supply path 30 is a nitrogen flow path inside the gas valve train and includes a nitrogen bridge path 300 connected to the nitrogen inlet pipe 50 and a nitrogen bridge path 300 connected between the MEGI pipe 51 and the first valve 11, An MEGI pipe 30-1, and a nitrogen-FGS pipe 30-2 connected between the FGS pipe 53 and the second valve 12.

Nitrogen bridge path 300: Four first nitrogen valves 31, a second nitrogen valve 32, a third nitrogen valve 33 and a fourth nitrogen valve 34 form a diamond-like bridge path, Each of the bridges includes a nitrogen inlet pipe 50, a vent pipe 52, a nitrogen-MEGI pipe 30-1 connected between the MEGI pipe 51 and the first valve 11, an FGS pipe 53, Connected to the nitrogen-FGS pipe 30-2, which is connected between the valves 12.

The nitrogen-methane path control valve 310 includes a fifth nitrogen valve 35 formed in the nitrogen-MEGI pipe 30-1 and a sixth nitrogen valve 36 formed in the nitrogen-FGS pipe 30-2. .

Methane path lock valve (13): A manual on / off valve

Vent path 20: A pipeline path connecting the methane path 10 between the first valve 11 and the second valve 12 to the vent piping 52.

Main vent control valve (21): A control valve formed in the vent path (20).

Hereinafter, the gas valve train (GVT) will be described in conjunction with the above-mentioned terms and drawings.

The present invention relates to a gas valve train (GVT), wherein the gas valve train (GVT) means a switching valve box installed between the LNG marine engine MEGI and the fuel gas system FGS as shown in FIG.

Safety is the top priority in the use of LNG gas as fuel, and the gas valve train (GVT) is used as fuel for FGS to MEG for safe operation of these vessels ) And safely shut off the fuel in case of emergency.

Gas valve trains are primarily aimed at ensuring vessel safety by quickly air-venting residual methane to the fuel supply line during MEGI shutdown.

Nitrogen, which is an inert gas, is used for the air vent. During the MEGI shutdown, nitrogen is pushed in as shown in FIG. 2 to feed the residual gas in the fuel line for the MEGI side, the fuel supply line for the FGS side, .

Therefore, as shown in FIGS. 3 and 5, a basic fuel supply path connecting the MEGI and the FGS is formed in the gas valve train GVT. In the present invention, this is defined as a 'methane path 10'.

A methane path control valve 100 for controlling the flow of methane gas during operation is installed in the methane path 10. The methane pathway control valve 100 includes a methane path 10 for safety in the methane path 10, The first valve 11 is formed on the MEGI side of the methane passage 10 and the second valve 12 is formed on the FGS side of the methane passage 10. [

During the MEGI shutdown, nitrogen (N ₂ ), which is an inert gas, is sequentially injected into the MEGI and FGS sides, and control of the nitrogen injection is performed in the gas valve train (GVT).

To this end, a nitrogen supply path 30 is connected to the methane path 10. The nitrogen supply path 30 is connected between the MEGI and the first valve 11 through a nitrogen-MEGI pipe 30-1 And a nitrogen-FGS pipe 30-2 which is connected between the FGS and the second valve 12.

The gas valve train GVT is also provided with a vent path 20 (shown in FIG. 3) for injecting the fuel gas or for injecting nitrogen into the methane pathway 10 for the purpose of air- ).

The vent path 20 is connected between the first valve 11 and the second valve 12 of the methane path 10 and the vent path 20 is opened and closed by the main vent control valve 21, do.

The connection of the nitrogen supply path 30 and the vent pipe 52 has a more complicated piping for the air vent of the residual gas inside the gas valve train as shown in FIG.

As shown in FIG. 4, the nitrogen supply path 30 and the vent pipe 52 are connected by a nitrogen bridge path 300.

The nitrogen bridge path 300 includes four first nitrogen valves 31, a second nitrogen valve 32, a third nitrogen valve 33 and a fourth nitrogen valve 34 formed in a diamond-like bridge path A nitrogen inlet pipe 50, a vent pipe 52, a nitrogen-MEGI pipe 30-1 connected between the MEGI pipe 51 and the first valve 11, an FGS pipe 53, FGS piping 30-2 connected between the two valves 12 is connected.

5, in which the basic structure of FIG. 4 is realized, the nitrogen supply path 30 of the present invention includes a nitrogen bridge path 300 connected to the nitrogen inlet pipe 50, The nitrogen-MEGI pipe 30-1 connected between the MEGI pipe 51 and the first valve 11, the nitrogen-FGS pipe 30-1 connected between the FGS pipe 53 and the second valve 12, (30-2).

The nitrogen-methane path control valve 310 of the present invention is a valve for controlling the injection of nitrogen into the methane path 10, and a fifth nitrogen valve 35 formed in the nitrogen-MEGI pipe 30-1, And a sixth nitrogen valve 36 formed in the nitrogen-FGS pipe 30-2.

5, the gas valve train GVT is basically connected to the methane passage 10 in a T-shape by the nitrogen supply passage 30 as shown in FIGS. 3 and 4. However, the methane passage 10 A methane path lock valve 13 provided for the basic manual opening and closing of the engine 1 is installed and a plurality of reverse osmosis 7 and a transmitter 8 for control are provided for the safe injection of nitrogen and the release of internal residual gas, 9), and the like are additionally installed, and are implemented with an external structure as shown in Fig.

However, when the gas valve train constructed as shown in FIG. 5 is operated, it is known that a very large amount of foreign substances are contained in the fuel gas. If these foreign substances are introduced into the MEGI side, a serious problem such as an engine failure occurs.

1, a filter 70 is installed on the side of the MEGI piping 51 at both ends of the methane passage 10 or at the side of the FGS piping 53 in order to remove the foreign matter.

However, since the amount of foreign matter contained in the fuel gas during operation of the vessel is irregular, an emergency situation in which the filter is broken in an unpredictable situation is frequently occurred.

1, a differential pressure meter 700 is provided at both ends of the filter 70 to measure a filtering load of the filter 70 to replace or repair the filter 70, To be used as a signal.

Accordingly, according to the signal of the differential pressure meter 700, it is possible to anticipate the replacement or cleaning time of the filter and to execute the replacement, thereby preventing the accident caused by the filter damage during the ship operation.

1, a protection valve 80 is added to a portion of the methane path 10 connected to the MEGI pipe 51, and an orifice (not shown) for connecting both ends of the protection valve 80 800).

According to such a configuration, a small amount of fuel gas is first injected into the orifice 800 when the fuel gas is supplied to the MEGI, and then the protection valve 80 is opened to supply the fuel gas. There is an advantage to protect.

That is, since a small amount of fuel is first supplied to the MEGI through the orifice 800, high-pressure fuel gas is suddenly pushed into the MEGI, thereby preventing fatigue damage in the engine.

As described above, the present invention protects the filter 70 using the differential pressure gauge 700 in the conventional gas valve train, thereby preventing accidental introduction of foreign matter into the MEGI side, reducing the maintenance cost of the equipment, There is an advantage that an engine-protected gas valve train for preventing fatigue damage is provided.

It will be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that the technical spirit of the present invention is to the extent possible.

1: Main block 2: Sub block
10: Methane path 11: First valve
12: second valve 13: methane path lock valve
20: Vented path 21: Main vent control valve
30: Nitrogen supply path 30-1: Nitrogen-MEGI piping
30-2: nitrogen-FGS piping 31: first nitrogen valve
32: second nitrogen valve 33: third nitrogen valve
34: fourth nitrogen valve 35: fifth nitrogen valve
36: Sixth nitrogen valve 40: Hydraulic piping for controlling each valve
50: nitrogen inlet pipe 51: MEGI pipe
52: vent pipe 53: FGS pipe
70: Filter 80: Protection valve
100: Methane path control valve 300: Nitrogen bridge path
310: nitrogen-methane path control valve 700: differential pressure gauge
800: Orifice

Claims (2)

A methane path 10 connecting both the external MEGI piping 51 and the FGS piping 53 at both ends thereof as a pipeline connecting the MEGI and the FGS; A nitrogen supply path 30 connecting the nitrogen inlet pipe 50 to the methane passage 10; A vent path 20 connecting the vent pipe 52 to the methane path 10 and valves installed in the methane path 10 and the nitrogen supply path 30 and the vent path 20, And a gas valve train for executing a fuel gas safety shutoff in the fuel gas supply and shutdown on the FGS side,
A filter 70 connected to the MEGI piping 51 or the FGS piping 53 connected to the methane path 10 and a differential pressure meter 700 formed at both ends of the filter 70, Measuring a differential pressure across the filter (70) while blocking foreign matter contained in the incoming fuel gas in the methane path (10) from the filter (70) to obtain a replacement or repair signal of the filter;
A protective valve 80 formed at a portion connected to the MEGI pipe 51 and an orifice 800 connecting both ends of the protective valve 80 to prevent the orifice 800), and then opening the protective valve (80) to supply the fuel gas, thereby protecting the MEGI from the fuel injection shock;
Wherein said gas valve train is an engine-protected gas valve train.
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