KR101526771B1 - A Treatment System Of Liquefied Gas - Google Patents

A Treatment System Of Liquefied Gas Download PDF

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Publication number
KR101526771B1
KR101526771B1 KR1020130166846A KR20130166846A KR101526771B1 KR 101526771 B1 KR101526771 B1 KR 101526771B1 KR 1020130166846 A KR1020130166846 A KR 1020130166846A KR 20130166846 A KR20130166846 A KR 20130166846A KR 101526771 B1 KR101526771 B1 KR 101526771B1
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KR
South Korea
Prior art keywords
gas
liquefied gas
pressure
storage tank
liquefied
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KR1020130166846A
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Korean (ko)
Inventor
강민호
허희승
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현대중공업 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation

Abstract

The present invention relates to a liquefied gas treatment system comprising: a first evaporation gas supply line to connect a liquefied gas storage tank, and a demand place; one or more evaporation gas compressors arranged on the first evaporation gas supply line, compressing evaporation gas in a plurality of stages; a vaporizer to vaporize liquefied gas received from the liquefied gas storage tank; a pump to supply the liquefied gas of the liquefied gas storage tank to the vaporizer by pressing the liquefied gas; a second evaporation gas supply line to connect the vaporizer and the demand place; a gas-liquid separator arranged on the second evaporation gas supply line, separating the evaporation gas vaporized by the vaporizer into gas and liquid; and a control part to vary a discharge pressure of the pump by detecting a pressure variation of the gas-liquid separator. According to the present invention, the liquefied gas treatment system returns the liquefied gas not vaporized to the liquefied gas storage tank without an additional liquid pressing unit by vaporizing the liquefied gas while applying a higher pressure than an internal pressure of the liquefied gas storage tank to the liquefied gas. Thus, the present invention obtains maximum space in a ship, and reduces installation costs by omitting the liquid pressing unit. Also, the present invention returns the liquefied gas not vaporized to the liquefied gas storage tank without the additional pressing unit by transferring the liquefied gas to the vaporizer after pressing the liquefied gas to have a higher pressure than the internal pressure of the liquefied gas storage tank using the pump; thereby reducing costs and obtaining space for the ship.

Description

Description of the Related Art A Treatment System Of Liquefied Gas

The present invention relates to a liquefied gas processing system.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

However, since the liquefied gas is kept in a liquefied state by increasing the pressure or lowering the temperature, it is important to secure the heat insulating property of the liquefied gas storage tank because the phase change due to external heat penetration is a concern. However, since the liquefied gas storage tank can not achieve perfect heat insulation, some of the liquefied gas stored in the liquefied gas storage tank is phase-changed into vapor gas, which is a gas, by heat transmitted from the outside.

When the internal pressure of the liquefied gas storage tank exceeds the pressure that can be tolerated by the liquefied gas storage tank, the liquefied gas storage tank The tank may be damaged.

Therefore, conventionally, in order to keep the internal pressure of the liquefied gas storage tank at a constant level, a method has been used in which the evaporation gas is discharged to the outside to lower the internal pressure of the liquefied gas storage tank, if necessary. Or the evaporation gas was discharged to the outside of the liquefied gas storage tank, and then liquefied by using a separate liquefaction device and then recovered again into the liquefied gas storage tank.

Also, conventionally, when the amount of evaporation gas required by the customer is larger than the amount of evaporation gas generated in the liquefied gas storage tank and the evaporation gas is insufficient, the deficient evaporation gas is supplemented by using the liquefied gas, have. Therefore, the effective supplementing method of the liquefied gas is a problem, and development thereof is required.

Korean Published Patent Bulletin 2010-0061368 (2010.06.07)

It is an object of the present invention to provide a gas-liquid separator in which a vaporizer vaporizes a liquefied gas having a pressure higher than the internal pressure of a liquefied gas storage tank and supplies it to a gas-liquid separator, The present invention is intended to provide a liquefied gas processing system capable of omitting a configuration for separating gas and liquid to pressurize the liquid when returning the liquid to the liquefied gas storage tank.

It is also an object of the present invention to provide a method and apparatus for supplying a liquid at the return of a liquid from a gas-liquid separator to a liquefied gas storage tank by supplying a liquefied gas to a vaporizer while pressurizing the liquefied gas at a pressure higher than the internal pressure of the liquefied- The present invention is intended to provide a liquefied gas processing system capable of omitting a pressurizing configuration.

According to an aspect of the present invention, there is provided a liquefied gas processing system comprising: a first evaporation gas supply line connecting a liquefied gas storage tank and a customer; At least one evaporative gas compressor provided on the first evaporative gas supply line for multi-stage compressing the evaporative gas; A vaporizer for supplying and liquefying the liquefied gas from the liquefied gas storage tank; A pump for pressurizing the liquefied gas in the liquefied gas storage tank and supplying the liquefied gas to the vaporizer; A second evaporation gas supply line connecting the vaporizer and the demander; A gas-liquid separator provided on the second evaporation gas supply line and supplied with evaporation gas vaporized from the vaporizer to separate the gas and the liquid; And a controller for detecting a change in pressure of the gas-liquid separator and varying the discharge pressure of the pump.

Specifically, the apparatus may further include a pressure sensor for sensing a change in pressure of the gas-liquid separator, which is generated as the vaporized liquefied gas separated in the gas-liquid separator is discharged.

Specifically, the control unit may receive the internal pressure value of the gas-liquid separator measured by the pressure sensor and control the discharge pressure of the pump.

Specifically, the apparatus further includes a flow rate sensor that is provided on the second evaporation gas supply line and measures a flow rate of vaporized liquefied gas discharged from the gas-liquid separator, wherein the control unit controls the flow rate value measured by the flow rate sensor And calculates the internal pressure value of the gas-liquid separator and controls the discharge pressure of the pump.

Specifically, the control unit may control to increase the discharge pressure of the pump when the internal pressure value of the gas-liquid separator measured by the pressure sensor decreases.

More specifically, the control unit may control to increase the discharge pressure of the pump when the internal pressure value of the gas-liquid separator calculated according to the flow rate value measured by the flow rate sensor decreases.

Specifically, the control unit may control the discharge pressure of the pump so that the internal pressure of the gas-liquid separator is greater than the internal pressure of the liquefied gas storage tank.

Specifically, the customer may be a low-pressure consumer who receives a low-pressure evaporative gas; And a high-pressure consumer supplied with a high-pressure evaporative gas, wherein the first evaporative gas supply line is branched between the second and third stages of the evaporative gas compressor and connected to the low-pressure consumer, Pressure evaporation gas supply line for supplying the pressurized evaporated gas to the low-pressure consumer site; And a high-pressure evaporating gas supply line connecting the liquefied gas storage tank and the high-pressure consumer to supply the evaporated gas compressed by the evaporation gas compressor to the high-pressure consumer at a high pressure.

Specifically, the evaporative gas compressor may further include at least one evaporative gas cooler positioned downstream of the evaporative gas compressor for cooling the pressurized evaporative gas with a heat exchange medium.

A liquefied gas supply line connecting the liquefied gas storage tank and the vaporizer; And a liquefied gas return line connecting the gas-liquid separator and the liquefied gas storage tank.

The liquefied gas processing system according to the present invention vaporizes the liquefied gas when the liquefied gas is vaporized under a pressure higher than the internal pressure of the liquefied gas storage tank to vaporize the liquefied gas that has not been vaporized without separate liquid pressurizing means It is possible to return to the liquefied gas storage tank. Therefore, since the liquid pressurizing means can be omitted, it is possible to maximize the securing of the ship space and reduce the installation cost.

Also, by using a pump to pressurize the liquefied gas so that the internal pressure of the vaporizer has a pressure value exceeding the internal pressure of the liquefied gas storage tank and then send it to the vaporizer, the liquefied gas, which has not been vaporized, It is possible to return to the gas storage tank, thereby reducing the cost and securing the ship space.

1 is a configuration diagram of a liquefied gas processing system according to the prior art.
2 is a configuration diagram of a liquefied gas processing system according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

1 is a conceptual diagram of a conventional liquefied gas processing system.

1, a conventional liquefied gas processing system 1 includes a liquefied gas storage tank 10, a pump 11, a customer 20, an evaporative gas compressor 30, a vaporizer 40, Separator < / RTI >

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to the evaporative gas. In addition, LNG can be used to mean not only NG (Natural Gas) in liquid state but also NG in supercritical state for convenience, and evaporation gas can be used to include not only gaseous evaporation gas but also liquefied evaporation gas have.

The conventional liquefied gas processing system 1 extracts the gaseous vaporized gas from the liquefied gas storage tank 10 and compresses the vaporized gas through the vaporized gas compressor 30 along the first vaporized gas supply line 21, (20).

However, in the case where the amount of the evaporative gas supplied to the customer 20 through the first evaporative gas supply line 21 is smaller than the amount of the evaporative gas required by the customer 20, the conventional liquefied gas processing system 1, The liquefied gas stored in the liquefied gas storage tank 10 is forcibly vaporized by using the vaporizer 40 and is passed through the gas-liquid separator 50 and then flows through the second evaporation gas supply line 22 to the front end of the evaporative gas compressor 30 To supply the shortage of evaporative gas.

In the conventional liquefied gas processing system 1, the liquefied gas storage tank 10 is maintained at a constant internal pressure to maintain and store the temperature of the liquefied gas, and the internal pressure is increased due to the evaporated gas generated in the liquefied gas do. Due to the internal pressure of the liquefied gas storage tank 10, the liquefied gas which has not been vaporized in the gas-liquid separator 50 is not returned to the liquefied gas storage tank 10, or the liquefied gas in the liquefied gas storage tank 10 There is a problem that the gas flows back to the gas-liquid separator 50.

Therefore, the conventional liquefied gas processing system 1 further includes nitrogen pressurizing means 51 to increase the internal pressure of the gas-liquid separator 50 by using the nitrogen pressurizing means 51, The liquefied gas that has not been vaporized at a pressure higher than the pressure is returned to the liquefied gas storage tank 10 to prevent the above-described problems.

However, due to such additional construction, there is a problem that installation space of the liquefied gas processing system 1 inside the vessel is reduced, installation cost is increased, and evaporative gas treatment efficiency is low.

2 is a conceptual diagram of a liquefied gas processing system according to an embodiment of the present invention.

2, a liquefied gas processing system 2 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a pump 11, a customer 20, an evaporative gas compressor 30, A vaporizer 40, a gas-liquid separator 50, and a controller 60. In the embodiment of the present invention, the liquefied gas storage tank 10, the pump 11, the customer 20, the evaporative gas compressor 30, the vaporizer 40, the gas-liquid separator 50, (1), the same reference numerals are used for the respective constituent elements and for the sake of convenience, but they are not necessarily denoted by the same constituent elements.

The liquefied gas storage tank (10) stores liquefied gas to be supplied to the customer (20). The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, wherein the liquefied gas storage tank 10 may have the form of a pressure tank.

In this embodiment, the evaporation gas generated from the liquefied gas storage tank 10 is pressurized and utilized as the fuel of the customer 20, so that the evaporation gas can be efficiently used. When the evaporation gas becomes insufficient, The liquefied gas stored in the tank 10 is used as the fuel of the customer 20 via the vaporizer 40 by the pump 11 to be described later so that the liquefied gas can be efficiently used.

Here, the pump 11 may be provided in the liquefied gas storage tank 10 and may be designed as a submergible pump so as to be immersed in the liquefied gas. Details of the pump 11 will be described below.

The pump 11 can supply the liquefied gas of the liquefied gas storage tank 10 to the vaporizer 40 to be described later and can pressurize the liquefied gas with a pressure exceeding the pressure of the liquefied gas storage tank 10. [

The pump 11 may be provided inside the liquefied gas storage tank 10, in which case it may be provided in a sleep mode or may be provided outside the liquefied gas storage tank 10. In this case, And the like.

The pump 11 can be pressurized to several tens to several tens of bar, and preferably to 1 to 25 bar when the liquefied gas is pressurized.

The pressure of the pressurized liquefied gas may change during the vaporization in the vaporizer 40 and may also be lowered on the line while being supplied to the customer 20 via the second vapor gas supply line 22. [ Therefore, the pump 11 can initially pressurize the liquefied gas at a pressure higher than the required pressure of the customer 20 in order to supply the liquefied gas having a preset pressure required by the customer 20.

The pump 11 may be provided on the liquefied gas supply line 23 and may be a boosting pump so that evaporation gas generated in the liquefied gas storage tank 10 more than the evaporation gas amount required by the customer 20 When the amount of gas is small, the liquefied gas can be taken out from the liquefied gas storage tank 10, pressurized, and then supplied to the vaporizer 40, which will be described later.

This embodiment omits the nitrogen pressurizing means 51 and allows the pump 11 to replace the role of the nitrogen pressurizing means 51, thereby effectively solving the conventional problems. That is, the pump 11 supplies the liquefied gas to the vaporizer 40 at a pressure higher than the internal pressure of the liquefied gas storage tank 10 so that the gas-liquid separator 50, which will be described later, The liquefied gas in the liquid state can be returned to the liquefied gas storage tank 10 only by the pressure of the supplied liquefied gas.

Therefore, the installation space of the liquefied gas processing system 2 can be sufficiently secured, the installation cost can be reduced, and the processing efficiency of the evaporated gas can be increased.

The customer 20 is driven through the evaporative gas supplied from the liquefied gas storage tank 10 to generate power. At this time, the customer 20 is a high-pressure engine, which may be a gas fuel engine (for example, MEGI). The customer 20 may include a high-pressure consumer 201 supplied with the high-pressure evaporation gas and a low-pressure consumer 202 supplied with the low-pressure evaporation gas.

As the piston 20 (not shown) in the cylinder (not shown) reciprocates by the combustion of the liquefied gas, the consumer 20 rotates the crankshaft (not shown) connected to the piston and is connected to the crankshaft A shaft (not shown) can be rotated. Therefore, as the propeller (not shown) connected to the shaft rotates when the consumer 20 is driven, the hull can move forward or backward.

Of course, in this embodiment, the customer 20 may be an engine for driving the propeller, but it may be an engine for generating power or an engine for generating other power. In other words, the present embodiment does not particularly limit the kind of the consumer 20. However, the customer 20 may be an internal combustion engine that generates a driving force by the combustion of the evaporative gas and the flash gas.

The customer 20 is supplied with the evaporated gas pressurized by the evaporative gas compressor 30 to obtain the driving force. The state of the evaporative gas supplied to the consumer 20 may vary depending on the state required by the consumer 20.

The high-pressure consumer site 201 may be, for example, a MEGI engine (not shown), which is multi-stage compressed by the evaporation gas compressor 30 to be described later and uses high-pressure evaporation gas of about 300 bar, The liquefied gas in the liquefied gas storage tank 10 is supplied from the liquefied gas storage tank 10 to the pump (not shown) when the evaporated gas generated in the liquefied gas storage tank 10 is smaller than the amount of evaporated gas required by the high- 11, the vaporizer 40, and the gas-liquid separator 50 to the upstream side of the evaporative gas compressor 30.

The low-pressure consumer 202 is a consumer using a low-pressure evaporation gas of about 7 to 10 bar compressed by the evaporation gas compressor 30 to be described later, for example, a DFDE engine (not shown) have.

The consumer 20 is preferentially used by receiving the evaporated gas pressurized by the evaporative gas compressor 30 from the liquefied gas storage tank 10 through the first evaporative gas supply line 21 but is preferably used in the liquefied gas storage tank The liquefied gas pressurized and vaporized by the pump 11 and the vaporizer 40 is supplied from the liquefied gas storage tank 10 to the second evaporation gas 10 when the evaporation gas generated by the evaporator 10 is smaller than the evaporation gas demanded by the customer 20. [ Can be supplied through the supply line 22 and used.

In the embodiment of the present invention, the first evaporation gas supply line 21 may be further included. The first evaporation gas supply line 21 connects the liquefied gas storage tank 10 and the customer 20 and includes an evaporation gas compressor 30, an evaporation gas cooler 31 and a heater (not shown) And the heater is positioned at the front end of the evaporative gas compressor 30 to be described later to increase the temperature of the evaporative gas introduced into the evaporative gas compressor 30 so that the use of a normal evaporative gas compressor There is an advantage in that it can be made possible, and therefore, the effect of widening the selection can be obtained.

Further, the heater can be positioned at the rear end of the evaporative gas compressor (30) to suitably set the temperature of the evaporative gas required by the customer (20).

The first evaporation gas supply line 21 connects the liquefied gas storage tank 10 and the consumer 20 to supply the evaporated gas generated in the liquefied gas storage tank 10 to the consumer 20 preferentially have.

The first evaporation gas supply line 21 may include a high pressure evaporation gas supply line 211 and a low pressure evaporation gas supply line 212.

The high-pressure evaporation gas supply line 211 connects the liquefied gas storage tank 10 and the high-pressure consumer 201 and supplies the evaporation gas compressed by the evaporation gas compressor 30 at a high pressure to the high-pressure consumer 201 have.

The low-pressure evaporation gas supply line 212 is branched from the second and third stages of the evaporation gas compressor 30 and connected to the low-pressure consumer 202. The evaporation gas pressurized to the second stage by the evaporation gas compressor 30 is supplied to the low- Can be supplied to the customer (202).

At this time, a fuel supply valve (not shown) is provided in the high-pressure evaporation gas supply line 211 and the low-pressure evaporation gas supply line 212 so that the supply amount of the evaporation gas can be adjusted according to the opening degree control of the fuel supply valve.

In the embodiment of the present invention, the second evaporation gas supply line 22 may be further included.

The second evaporation gas supply line 22 includes a vaporizer 40 to be described later and a gas-liquid separator 50 to be described later to supply the vaporized liquefied gas to the front end of the evaporation gas compressor 30. The second evaporation gas supply line 22 is connected to the evaporator 40 through the first evaporation gas supply line 21 when the amount of evaporation gas supplied is less than the amount of evaporation gas required by the customer 20 The forced vaporized liquefied gas can be supplied to the front end of the evaporative gas compressor 30 to supply the insufficient evaporated gas.

At this time, an evaporation gas supply valve (not shown) is provided in the second evaporation gas supply line 22 so that the supply amount of the evaporation gas can be adjusted according to the opening degree of the evaporation gas supply valve.

In the embodiment of the present invention, a liquefied gas supply line 23 may be further included. The liquefied gas supply line 23 can connect the liquefied gas storage tank 10 and the vaporizer 40, and a pump 11 can be provided.

At this time, a liquefied gas supply valve (not shown) is provided in the liquefied gas supply line 23 so that the supply amount of the liquefied gas can be adjusted according to the opening degree of the liquefied gas supply valve.

In the embodiment of the present invention, a liquefied gas return line 24 may be further included. The liquefied gas return line 24 can connect the gas-liquid separator 50 and the liquefied gas storage tank 10 or the vaporizer 40.

The liquefied gas return line 24 may be provided at the lower end of the gas-liquid separator 50 and the un-vaporized liquefied gas introduced into the gas-liquid separator 50 is collected at the lower portion of the gas- To the liquefied gas storage tank 10 or the vaporizer 40 by means of the vaporizer (not shown).

At this time, a valve (not shown) is provided in the liquefied gas return line 24 so that the return amount of the liquefied gas can be adjusted according to the opening degree of the valve.

The evaporation gas compressor (30) is provided on the first evaporation gas supply line (21), and at least one evaporation gas compressor (30) is provided for multi-stage compression of the evaporation gas.

The evaporation gas compressor (30) is provided on the first evaporation gas supply line (21) and pressurizes the evaporation gas generated in the liquefied gas storage tank (10). Further, the plurality of evaporative gas compressors 30 pressurize the evaporative gas to 200 to 400 bar (about 300 bar), and the pressurized evaporative gas may be supplied to the consumer 20 through the evaporative gas supply line 21.

A plurality of evaporation gas compressors (30) can be provided to pressurize the evaporation gas at multiple stages. For example, five evaporation gas compressors 30 may be provided so that the evaporation gas is pressurized in five stages. The five-stage pressurized evaporation gas may be pressurized to 200 bar to 400 bar (for example, 300 bar) and supplied to the customer 20 through the first evaporation gas supply line 21.

Specifically, the evaporative gas compressor 30 flows into the liquefied gas storage tank 10 at about 1.05 bar and is pressurized to about 5 bar at the first stage, about 15 bar at the second stage, about 90 bar at the third stage, , And in the fifth stage it can be pressurized to about 300 bar. The evaporation gas pressurized at the second stage to about 15 bar is supplied to the low pressure consumer 202 by the low pressure evaporation gas supply line 212 or is introduced into the evaporation gas compressor 30 by the high pressure evaporation gas supply line 211, And the evaporated gas pressurized at the fifth stage to about 300 bar can be supplied to the high-pressure consumer 201 by the high-pressure evaporative gas supply line 211.

Between the plurality of evaporative gas compressors (30), an evaporative gas cooler (31) is provided to cool the pressurized evaporative gas with the heat exchange medium. The evaporated gas refrigerant 31 is heated by the evaporation gas compressor 30 and the temperature of the evaporated gas refrigerant 31 is increased as the pressure rises to increase the volume of the evaporated gas compressor 30 due to the volume increase. The temperature of the evaporation gas can be lowered again. The evaporative gas cooler 31 may be installed in the same number as that of the evaporative gas compressor 30 and each evaporative gas cooler 31 may be provided at the rear end of each evaporative gas compressor 30.

The vaporizer 40 supplies and vaporizes the liquefied gas from the liquefied gas storage tank 10, and vaporizes the liquefied gas at an excess pressure higher than the internal pressure of the liquefied gas storage tank 10.

The vaporizer (40) receives and vaporizes the liquefied gas from the liquefied gas storage tank (10). The vaporizer 40 is located between the liquefied gas storage tank 10 and the customer 20 and can receive the liquefied gas from the liquefied gas storage tank 10 from the pump 11.

The vaporizer 40 can supply the liquefied gas from the liquefied gas storage tank 10 and vaporize the entire volume and supply it to the gas-liquid separator 50 to be described later. If the vaporizer 40 can not vaporize the whole amount, The gas can be returned to the customer 20, and the non-vaporized liquefied gas can be returned to the liquefied gas storage tank 10 or the vaporizer 40.

The vaporizer 40 operates when the amount of evaporative gas generated in the liquefied gas storage tank 10 is less than the amount of evaporative gas required in the consumer 20 so that the flow rate of the evaporative gas supplied to the consumer 20 .

In the conventional evaporative gas treatment system 1, when the vaporized gas which has not been vaporized in the gas-liquid separator 50 is returned to the liquefied gas storage tank 10 or the vaporizer 40, the vaporized gas is realized through the additional constitution of the nitrogen pressurizing means 51 The installation space of the system is reduced, the installation cost is increased, and the evaporative gas treatment efficiency is reduced.

Thus, in the present embodiment, the nitrogen pressurizing means 51 can be omitted, and the vaporizer 40 can replace the role of the nitrogen pressurizing means 51, effectively solving the conventional problems.

That is, the vaporizer 40 vaporizes the liquefied gas having a pressure higher than the internal pressure of the liquefied gas storage tank 10 and supplies it to the gas-liquid separator 50 so that the gas-liquid separator 50 can be supplied to the vaporizer 40 The liquefied gas in the liquid state can be returned to the liquefied gas storage tank 10 only by the pressure of the liquefied gas in the liquid state supplied from the liquefied gas storage tank 10.

The vaporizer 40 can increase the internal pressure of the gas-liquid separator 50 by increasing the vaporization rate of the liquefied gas and increasing the vaporized liquefied gas in the gas-liquid separator 50. In the present invention, Method can be applied.

Therefore, the installation space of the liquefied gas processing system 2 can be sufficiently secured, the installation cost can be reduced, and the processing efficiency of the evaporated gas can be increased.

The gas-liquid separator 50 is provided on the second evaporation gas supply line 22 and receives vaporized liquefied gas from the vaporizer 40 to separate the gas and the liquid.

The gas-liquid separator 50 supplies the liquefied gas supplied from the vaporizer 40 to the evaporation gas compressor 30 through the second evaporation gas supply line 22 and the vaporized liquefied gas Liquid separator 50 and returned to the liquefied gas storage tank 10 or the vaporizer 40 through the liquefied gas return line 24. [

The controller (60) senses the pressure change of the gas-liquid separator (50) and varies the discharge pressure of the pump (11).

In the embodiment of the present invention, the pressure sensor 61 or the flow rate sensor 62 may be further included. The control unit 60 can receive the internal pressure value of the gas-liquid separator 50 measured by the pressure sensor 61 and control the discharge pressure of the pump 11. [ The flow rate value measured by the flow rate sensor 62 is received and the internal pressure value of the gas-liquid separator 50 is calculated and the discharge pressure of the pump 11 can be controlled.

The control unit 60 can control to increase the discharge pressure of the pump 11 when the internal pressure value of the gas-liquid separator 50 measured by the pressure sensor 61 decreases, It is possible to control to increase the discharge pressure of the pump 11 when the internal pressure value of the gas-liquid separator 50 calculated in accordance with the flow rate value measured by the flow rate measuring means decreases.

The controller 60 can also control the discharge pressure of the pump 11 so that the internal pressure of the gas-liquid separator 50 is greater than the internal pressure of the liquefied gas storage tank 10.

The pressure sensor 61 can detect a pressure change of the gas-liquid separator 50 which occurs as the vaporized liquefied gas separated at the gas-liquid separator 50 is discharged.

The flow rate sensor 62 is provided on the second evaporation gas supply line 22 to measure the flow rate of the vaporized liquefied gas discharged from the gas-liquid separator 50.

At this time, the pressure sensor 61 and the flow rate sensor 62 may be general measurement sensors.

The liquefied gas processing system 2 according to the present invention vaporizes the liquefied gas in a state in which the liquefied gas is applied at a pressure higher than the internal pressure of the liquefied gas storage tank 10 when vaporizing the liquefied gas, There is an effect that the non-vaporized liquefied gas can be returned to the liquefied gas storage tank 10. Therefore, since the liquid pressurizing means can be omitted, it is possible to maximize the securing of the ship space and reduce the installation cost.

Further, by using the pump 11 to pressurize the liquefied gas so that the internal pressure of the carburetor 40 has a pressure value exceeding the internal pressure of the liquefied gas storage tank 10 and send it to the carburetor 40, It is possible to return the liquefied gas that has not been supplied to the liquefied gas storage tank without additional pressurizing means, thereby achieving cost reduction and securing of the ship space.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: conventional liquefied gas processing system 2: liquefied gas processing system
10: liquefied gas storage tank 11: pump
20: Demand point 201: High pressure demand point
202: low pressure consumer 21: first evaporation gas supply line
211: high pressure evaporation gas supply line 212: low pressure evaporation gas supply line
22: second evaporation gas supply line 23: liquefied gas supply line
24: Liquefied gas return line 30: Evaporative gas compressor
31: Evaporative gas cooler 40: Evaporator
50: gas-liquid separator 51: nitrogen pressurizing means
60: control unit 61: pressure sensor
62: Flow sensor

Claims (10)

A vaporizer for supplying and liquefying the liquefied gas from the liquefied gas storage tank;
A pump for pressurizing the liquefied gas in the liquefied gas storage tank and supplying the liquefied gas to the vaporizer;
A gas-liquid separator for separating the gas and the liquid from the vaporized gas supplied from the vaporizer; And
And a control unit for controlling a discharge pressure of the pump such that an internal pressure of the gas-liquid separator is greater than an internal pressure of the liquefied gas storage tank by detecting a pressure change of the gas-liquid separator. The method according to claim 1,
Further comprising a pressure sensor for detecting a change in pressure of the gas-liquid separator caused by the discharge of the vaporized liquefied gas separated in the gas-liquid separator. 3. The apparatus of claim 2,
Wherein the controller controls the discharge pressure of the pump by receiving the internal pressure value of the gas-liquid separator measured by the pressure sensor. The method according to claim 1,
A first evaporation gas supply line connecting the liquefied gas storage tank and a customer;
A second evaporation gas supply line connecting the vaporizer and the demander; And
Further comprising a flow rate sensor provided on the second evaporation gas supply line for measuring a flow rate of the vaporized liquefied gas discharged from the gas-liquid separator,
Wherein,
And an internal pressure value of the gas-liquid separator is calculated by receiving the flow rate value measured by the flow rate sensor,
And controls the discharge pressure of the pump. The apparatus of claim 3,
Wherein the controller controls to increase the discharge pressure of the pump when the internal pressure value of the gas-liquid separator measured by the pressure sensor decreases. 5. The apparatus of claim 4,
Wherein the controller controls to increase the discharge pressure of the pump when the internal pressure value of the gas-liquid separator calculated according to the flow rate value measured by the flow rate sensor decreases. delete The method according to claim 1,
A first evaporation gas supply line connecting the liquefied gas storage tank and a customer;
A second evaporation gas supply line connecting the vaporizer and the demander; And
Further comprising at least one evaporative gas compressor provided on the first evaporative gas supply line for multi-stage compressing the evaporative gas,
The above-
A low pressure consumer supplied with a low-pressure evaporative gas; And
And a high-pressure consumer which is supplied with high-pressure evaporative gas,
Wherein the first evaporation gas supply line includes:
A low pressure evaporation gas supply line branched from the second and third stages of the evaporation gas compressor and connected to the low pressure consumer, for supplying evaporation gas pressurized to the second stage by the evaporation gas compressor to the low pressure consumer; And
And a high-pressure evaporation gas supply line connecting the liquefied gas storage tank and the high-pressure consumer to supply the evaporation gas compressed by the evaporation gas compressor to the high-pressure consumer at a high pressure. The method according to claim 1,
A first evaporation gas supply line connecting the liquefied gas storage tank and a customer;
A second evaporation gas supply line connecting the vaporizer and the demander;
At least one evaporative gas compressor provided on the first evaporative gas supply line for multi-stage compressing the evaporative gas; And
Further comprising at least one evaporative gas cooler located downstream of the evaporative gas compressor for cooling the pressurized evaporative gas with a heat exchange medium. The method according to claim 1,
A liquefied gas supply line connecting the liquefied gas storage tank and the vaporizer; And
And a liquefied gas return line connecting the gas-liquid separator and the liquefied gas storage tank.
KR1020130166846A 2013-12-30 2013-12-30 A Treatment System Of Liquefied Gas KR101526771B1 (en)

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