KR102677185B1 - Lng fuel supply system with heat exchange type carburetor - Google Patents

Abstract

The present invention manufactures an ISO tank filled with liquefied natural gas and a heat exchange vaporizer in an integrated form so that they can be installed in a portable form on a generator or engine in an island region, and the heat exchange vaporizer can be driven using the coolant waste heat of an already installed generator or engine. This relates to an LNG fuel supply system using a heat exchange type vaporizer that allows liquefied natural gas to be easily fueled and used in island areas without a separate complicated vaporization facility.

Description

LNG fuel supply system applying heat exchange type vaporizer {LNG FUEL SUPPLY SYSTEM WITH HEAT EXCHANGE TYPE CARBURETOR}

The present invention relates to an LNG fuel supply system using a heat exchange type vaporizer. More specifically, the ISO tank filled with liquefied natural gas and the heat exchange type vaporizer are manufactured as one piece so that they can be installed in a portable form on a generator or engine in island areas. LNG fuel supply using a heat exchange type vaporizer that allows the heat exchange type vaporizer to be driven using the coolant waste heat of an already installed generator or engine, allowing liquefied natural gas to be easily fueled and used in island areas without a separate complicated vaporization facility. It's about the system.

In general, a natural atmosphere vaporizer uses aluminum with excellent thermal conductivity and interconnects the shape of a pipe with a wing shape, so that the liquefied gas and the air outside the fin-tube exchange heat through natural convection to liquefy the gas. It refers to a device that vaporizes gas.

This natural atmospheric vaporization device does not require separate utilities, so it is easy to maintain and can be easily used by anyone. In particular, it has the advantage of not incurring additional costs due to re-inspection.

However, if the vaporizer is used continuously, the efficiency is reduced due to freezing phenomenon due to heat exchange. As it is installed in parallel, alternating operation is recommended every 8 hours, and it requires a larger area than a forced vaporizer, so it can be used in small spaces. There are also problems with installation restrictions.

Meanwhile, ISO tanks (especially cylindrical C-type ISO tanks), which are generally containers for storing liquefied natural gas, are transported by sea via ship in a standardized container-type frame that is separate from the vaporization device. In order to turn it into fuel on land, it is necessary to vaporize liquefied natural gas. This requires both a separate storage space to store the separately transported ISO tank, a separate vaporization device to vaporize the ISO tank liquefied natural gas, and an installation space to install it. There are difficulties in providing complex vaporization equipment in the region to turn it into fuel and use it.

Accordingly, there is a need for technology that allows standardized ISO tanks to be utilized by vaporizing and fueling a standardized ISO tank without a separate complex vaporization device (or vaporization facility).

Korean Patent No. 10-1650073

The present invention is intended to solve the above-mentioned problems, by manufacturing an ISO tank filled with liquefied natural gas and a heat exchange type vaporizer in an integrated form so that it can be installed in a portable form on a generator or engine in an island area, and coolant of the already installed generator or engine. By making it possible to drive a heat exchange vaporizer using waste heat, we aim to provide an LNG fuel supply system using a heat exchange vaporizer that allows liquefied natural gas to be easily fueled and used in island areas without a separate complex vaporization facility.

The LNG fuel supply system using a heat exchange vaporizer according to an embodiment of the present invention includes an ISO tank 110, one side of which is connected to the ISO tank 110, and the other side of which is connected to the coolant supply source of an external engine, A heat exchange type vaporization device 120 that vaporizes liquefied natural gas supplied from the ISO tank 110 using the waste heat of the supplied cooling water, and the ISO tank 110 and the heat exchange type vaporization device 120 are accommodated inside. The storage container 130 is provided in a movable form, and the heat exchange type vaporizer 120 is provided in a form that is separable from the coolant supply source of the external engine. You can.

In one embodiment, the heat exchange vaporizer 120 is connected to a coolant pump included in the coolant supply source of the external engine, and the liquefied natural gas supplied from the ISO tank 110 and the coolant supplied through the coolant pump After exchanging heat with each other, the vaporized natural gas is supplied toward the engine, and the liquefied natural gas supplied from the ISO tank 110 is first heat exchanged by the waste heat of the coolant and then returned to the ISO tank 110. The natural gas that flows in and is discharged to the outside due to an increase in pressure within the ISO tank 110 may be re-supplied to the heat exchange vaporization device 120 and then secondarily heat exchanged and vaporized by the waste heat of the cooling water.

In one embodiment, the present invention includes first to third valves 140, 150, 160, the second valve 150, and A fourth valve 170 is provided on a connection line that branches off from the connection line connecting the third valve 160 and connects to the heat exchange type vaporization device 120, and heat is exchanged primarily through the heat exchange type vaporization device 120. A fifth valve 180 provided on the connection line that re-introduces the natural gas into the ISO tank 110, and a connection line that re-introduces the natural gas in the ISO tank 110 into the heat exchange type vaporizer 120. A sixth valve 190 provided in, a seventh valve 200 provided in a connection line for supplying secondarily heat-exchanged and vaporized natural gas to the engine through the heat exchange type vaporizer 120, and charging the liquefied natural gas. The eighth valve 210 and the first to eighth valves 140, 150, 160, 170, 180, 190, 200, 210 provided in the connection line connecting the upper part of the ISO tank 110 with the ISO tank 110. It may further include a control unit (not shown) that controls the open/closed state.

In one embodiment, before charging the liquefied natural gas in the ISO tank 110, the control unit opens the first and eighth valves 140 and 210 to allow the liquefied natural gas supplied from the liquefied natural gas filling source to be supplied. After pre-cooling the ISO tank 110 by spraying it into the ISO tank 110 in the form of a spray, the seventh valve 210 can be blocked when the internal temperature of the ISO tank 110 cools below a preset temperature. there is.

In one embodiment, after pre-cooling of the ISO tank 110 is completed, the controller opens the first to third valves 140, 150, and 160 to allow the liquefied natural gas supplied from the liquefied natural gas filling source to It can be filled in the ISO tank 110.

In one embodiment, the control unit opens the first valve 140, the third and fourth valves 160 and 170, so that the liquefied natural gas supplied from the ISO tank 110 is supplied from the heat exchange vaporization device ( When heat is first exchanged by the waste heat of the cooling water flowing through 120) and then re-introduced into the ISO tank 110, the pressure within the ISO tank 110 increases as the heat-exchanged liquefied natural gas is re-introduced. The sixth valve 190 may be opened to allow natural gas in the ISO tank 110 to reflow into the heat exchange vaporizer 120.

In one embodiment, temperature sensors 220 that measure temperature changes within the ISO tank 110 may be provided on the upper and lower sides of the ISO tank 110, respectively.

In one embodiment, the pressure inside the ISO tank 110 is measured in real time on the upper side of the ISO tank 110, and when the pressure is higher than a preset pressure, the pressure inside the ISO tank 110 is automatically opened. A protection valve 230 may be provided to maintain the set pressure.

According to one aspect of the present invention, an ISO tank filled with liquefied natural gas and a heat exchange vaporizer are manufactured as one piece so that they can be installed in a portable form on a generator or engine in an island area, and waste heat from the coolant of the already installed generator or engine is used to By enabling the operation of a heat exchange vaporizer, it has the advantage of being able to easily fuel and use liquefied natural gas in island areas without the need for a separate, complicated vaporization facility.

In particular, since both the ISO tank and the vaporizer can be accommodated within a standardized container-type frame, there is an advantage that a separate vaporizer and a location for installing the vaporizer are unnecessary.

Figure 1 is a diagram showing the configuration of an LNG fuel supply system 100 using a heat exchange vaporizer according to an embodiment of the present invention.
FIG. 2 is a diagram showing the ISO tank 110 and the heat exchange vaporization device 120 accommodated in the storage container 130.
Figure 3 is a diagram showing the ISO tank 110 and the heat exchange vaporization device 120 in more detail.
FIG. 4 is a diagram illustrating the receiving container 130 in more detail.

Below, preferred embodiments are presented to aid understanding of the present invention. However, the following examples are provided only to make the present invention easier to understand, and the content of the present invention is not limited by the examples.

Figure 1 is a diagram showing the configuration of an LNG fuel supply system 100 applying a heat exchange vaporizer according to an embodiment of the present invention, and Figure 2 shows an ISO tank 110 and a heat exchange vaporizer in the receiving container 130 ( 120) is a drawing showing the received state, and FIG. 3 is a drawing showing the ISO tank 110 and the heat exchange type vaporization device 120 in more detail, and FIG. 4 is a drawing showing the receiving container 130 in more detail. .

1 to 4, the LNG fuel supply system 100 applying a heat exchange type vaporizer according to an embodiment of the present invention largely includes an ISO tank 110, a heat exchange type vaporizer 120, and a receiving container 130. It consists of:

The ISO tank 110 is accommodated inside the receiving container 130, accommodates liquefied natural gas (LNG), and is connected to a liquefied natural gas filling source through a valve provided at one end to receive liquefied natural gas.

The heat exchange type vaporization device 120 is connected to the ISO tank 110 within the receiving container 130 and vaporizes the liquefied natural gas supplied from the ISO tank 110 using the waste heat of the coolant supplied from the external engine coolant supply source. It plays a role in supplying power to the engine.

The receiving container 130 may be internally divided to accommodate the ISO tank 110 and the heat exchange vaporizer 120 discussed above, and its size is standardized.

Meanwhile, the ISO tank 110, the heat exchange vaporizer 120, the coolant supply source supplied to the heat exchange vaporizer 120, and the engine fueled by natural gas are connected through a plurality of connection lines and a plurality of pipes. Looking at this in more detail, it is as follows.

Referring to Figure 1, the lower part of the ISO tank 110 is connected to the liquefied natural gas filling station through a connection line, and in this case, first to third valves 140, 150, and 160 are provided in the connection line, respectively.

In addition, a connection line branched from the connection line connecting the second valve 150 and the third valve 160 is connected to the heat exchange type vaporizer 120, and at this time, a fourth valve 170 is provided in the connection line. . The liquefied natural gas supplied from the ISO tank 110 is supplied to the heat exchange vaporizer 120 through the third and fourth valves 160 and 170, and is supplied to the waste heat of the cooling water supplied to the heat exchange vaporizer 120. After the heat is first exchanged by the heat exchanger 120 and the upper part of the ISO tank 110, it is re-introduced to the ISO tank 110 through the fifth valve 180 provided in the connection line.

At this time, the ISO tank 110 is filled with BOG, and as the natural gas that has been primarily heat-exchanged by the heat exchange vaporizer 120 continues to flow in, the pressure within the ISO tank 110 continues to rise. The natural gas that has undergone primary heat exchange with the BOG gas is automatically pushed back to the outside by pressure and re-introduced into the heat exchange type vaporization device 120. At this time, the upper part of the ISO tank 110 and the heat exchange vaporizer 120 are connected to a connection line for re-introducing the natural gas mixed with BOG into the heat exchange vaporizer 120. At this time, the connection line has a sixth valve ( 190) is prepared.

The natural gas re-introduced into the heat exchange vaporizer 120 is secondarily heat-exchanged again by the waste heat of the coolant within the heat exchange vaporizer 120, is then vaporized, and is supplied to the engine through a connection line. At this time, a seventh valve 200 is provided in the connection line.

Meanwhile, another connection line may be branched from the connection line connecting the first valve 140 and the second valve 150 discussed above and further connected to the upper part of the ISO tank 110, and at this time, the connection line may be An eighth valve 210 is provided.

The connection line provided with the eighth valve 210 pre-cools the ISO tank 110 by spraying liquefied natural gas in the form of a spray before charging the liquefied natural gas in the ISO tank 110, thereby lowering the internal temperature of the ISO tank 110 to below zero. It should be between 130 degrees and -140 degrees below zero.

The first to eighth valves 140 to 210 discussed above are automatically controlled under the control of the control unit to adjust the flow rate of natural gas through each connection line. These are examined in order as follows.

First, all valves 140 to 200 in the LNG fuel supply system 100 using a heat exchange vaporizer are in a blocked state.

The control unit first opens the first and eighth valves 140 and 210 to spray liquefied natural gas into the ISO tank 110 in the form of a spray so that the internal temperature of the ISO tank 110 falls to -130 degrees to -140 degrees Celsius. do.

At this time, temperature sensors 220 that can measure temperature changes within the ISO tank 110 are provided on the upper and lower sides of the ISO tank 110, so if the temperature within the ISO tank 110 is -130 degrees to -140 degrees Celsius. In case of falling back, the control unit blocks the eighth valve 210 and opens the second and third valves 150 and 160 to fill the ISO tank 110 with liquefied natural gas supplied from the liquefied natural gas filling source. .

After charging is completed, the control unit blocks the first to third valves 140, 150, and 160, and then opens the third valve 160 and the fourth valve 170 to release the liquefied natural gas in the ISO tank 110. Heat exchange is performed in the first stage by using the waste heat of the cooling water flowing into and passing through the heat exchange type vaporization device 120. At the same time, the control unit opens the fifth valve 180 to re-introduce the primary heat-exchanged natural gas into the upper part of the ISO tank 110.

Here, after the first heat exchange, the temperature of the natural gas is between about -110 degrees Celsius and -100 degrees Celsius, and within the ISO tank 110, the liquefied natural gas (163 degrees Celsius) is located at the bottom of the tank, and natural gas in a gaseous state is (-110 degrees Celsius to -100 degrees Celsius) exists at the top of the tank. Temperature changes inside the ISO tank 110 can be detected in real time through the temperature sensors 220 provided on the upper and lower sides of the ISO tank 110.

Meanwhile, the pressure inside the ISO tank 110 increases due to the BOG and the natural gas continuously flowing inside the ISO tank 110, and the control unit opens the sixth valve 190 to increase the pressure within the ISO tank 110. By allowing natural gas along with the BOG to automatically flow into the heat exchange type vaporization device 120, heat exchange is performed a second time using the waste heat of the coolant. At the same time, the control unit opens the seventh valve 200 to supply vaporized natural gas toward the engine. At this time, since the internal pressure inside the ISO tank 110 is already high, natural gas in the gaseous state can automatically move to the heat exchange type vaporization device 120 just by opening the sixth valve 190 in the control unit. . In addition, after secondary heat exchange, the temperature of natural gas in gaseous state is 30 to 50 degrees Celsius.

In addition, the control unit detects the pressure inside the ISO tank 110 in real time from the upper side of the ISO tank 110 and protects the ISO tank 110 and the connecting line (piping) when the internal pressure is determined to be higher than the preset design pressure. To this end, the protection valve 230 is opened.

Meanwhile, in one embodiment, the connection line connecting the ISO tank 110 and the sixth valve 190 may have an additional connection line branched and connected to the outside, and the gaseous natural gas discharged from the ISO tank 110 may be connected to the outside. A ventilation valve 240 that discharges some of the gas to the outside may be additionally provided.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it is possible.

100: LNG fuel supply system using heat exchange vaporizer
110: ISO tank
120: Heat exchange vaporization device
130: Accommodating container
140, 150, 160, 170, 180, 190, 200, 210: first to eighth valves
220: Temperature sensor
230: protection valve
240: Ventilation valve

Claims (8)

ISO tank (110);
One side is connected to the ISO tank 110, and the other side is connected to the coolant supply source of an external engine, and heat exchange is performed to vaporize the liquefied natural gas supplied from the ISO tank 110 using the waste heat of the coolant supplied from the coolant supply source. type vaporizer (120);
A storage container 130 provided with a storage space inside to accommodate the ISO tank 110 and the heat exchange vaporizer 120;
First to third valves 140, 150, 160 provided in a connection line connecting a liquefied natural gas filling station and the ISO tank 110;
a fourth valve 170 branched from the connection line connecting the second valve 150 and the third valve 160 and provided in a connection line connected to the heat exchange vaporizer 120;
A fifth valve 180 provided on a connection line that re-introduces natural gas, which has been primarily heat-exchanged through the heat exchange type vaporization device 120, into the ISO tank 110;
A sixth valve 190 provided on a connection line that re-introduces the natural gas in the ISO tank 110 to the heat exchange vaporizer 120;
A seventh valve (200) provided in a connection line that supplies secondarily heat-exchanged and vaporized natural gas to the engine through the heat exchange type vaporizer (120);
An eighth valve 210 provided on a connection line connecting the liquefied natural gas filling station and the upper part of the ISO tank 110; and
It includes a control unit that controls the open and closed states of the first to eighth valves (140, 150, 160, 170, 180, 190, 200, and 210),
An LNG fuel supply system using a heat exchange type vaporizer, characterized in that the receiving container (130) is provided in a movable form, and the heat exchange type vaporizer (120) is provided in a form that can be separated from the coolant supply source of an external engine.
According to paragraph 1,
The heat exchange type vaporization device 120,
It is connected to a coolant pump included in the coolant supply source of the external engine, and after heat exchange between the liquefied natural gas supplied from the ISO tank 110 and the coolant supplied through the coolant pump, the vaporized natural gas is directed toward the engine. ensure that it is supplied,
The liquefied natural gas supplied from the ISO tank 110 is first heat-exchanged by the waste heat of the cooling water and then re-introduced into the ISO tank 110, and is discharged to the outside by an increase in pressure within the ISO tank 110. An LNG fuel supply system using a heat exchange type vaporizer, characterized in that natural gas is re-supplied to the heat exchange type vaporizer (120) and then secondarily vaporized through heat exchange by waste heat of the coolant.
delete According to paragraph 1,
The control unit,
Before charging the liquefied natural gas in the ISO tank 110, the first and eighth valves 140 and 210 are opened to spray the liquefied natural gas supplied from the liquefied natural gas filling source into the ISO tank 110. After pre-cooling the ISO tank 110 by spraying it in the form of a heat exchanger, the seventh valve 200 is blocked when the internal temperature of the ISO tank 110 cools below a preset temperature. LNG fuel supply system applied.
According to clause 4,
The control unit,
After pre-cooling of the ISO tank 110 is completed, the first to third valves 140, 150, and 160 are opened to fill the ISO tank 110 with liquefied natural gas supplied from the liquefied natural gas filling source. An LNG fuel supply system using a heat exchange type vaporizer, characterized in that as much as possible.
According to paragraph 1,
The control unit,
By opening the first valve 140 and the third and fourth valves 160 and 170, the liquefied natural gas supplied from the ISO tank 110 absorbs the waste heat of the cooling water flowing through the heat exchange vaporizer 120. After the heat is first exchanged by, it is re-introduced into the ISO tank 110,
When the pressure in the ISO tank 110 increases as the heat exchanged liquefied natural gas is re-introduced, the sixth valve 190 is opened to allow the natural gas in the ISO tank 110 to enter the heat exchange vaporizer 120. An LNG fuel supply system using a heat exchange vaporizer, characterized in that it is re-introduced into the LNG fuel supply system.
According to paragraph 1,
On the upper and lower sides of the ISO tank 110,
An LNG fuel supply system using a heat exchange type vaporizer, characterized in that a temperature sensor 220 is provided to measure temperature changes within the ISO tank 110.
According to paragraph 1,
On the upper side of the ISO tank 110,
A protection valve 230 is provided that measures the pressure in the ISO tank 110 in real time and automatically opens if the pressure exceeds a preset pressure to maintain the pressure in the ISO tank 110 at the preset pressure. An LNG fuel supply system using a heat exchange vaporizer, characterized in that