KR20200033380A - Liquefied gas regasification system - Google Patents

Abstract

Disclosed is a liquefied gas regasification system. According to an embodiment of the present invention, the liquefied gas regasification system includes: a condenser performing a condensation operation by using liquefied gas supplied from a storage tank; a high pressure pump pressurizing fluid condensed through the condenser to high pressure; a vaporizer vaporizing the pressurized fluid by using seawater; an ejector spouting the vaporized fluid to suck boil off gas of the liquefied gas stored in the storage tank and discharging the fluid mixed therewith; a thermoelectric module supplied with electricity from an electricity supply device to generate high temperature heat and cooling heat; a cooler cooling the discharged fluid by using the cooling heat; and a heater increasing temperature of the seawater to be supplied to the vaporizer by using the high temperature heat.

Description

Liquefied gas regasification system {LIQUEFIED GAS REGASIFICATION SYSTEM}

The present invention relates to a liquefied gas regasification system.

As the regulations of the International Maritime Organization (IMO) for the emission of greenhouse gases and various air pollutants have been strengthened, the shipbuilding and shipping industry has replaced natural fuels such as heavy fuels and diesel oils, and used natural gas, a clean energy source, as fuel for ships. There are many cases where it is used.

Natural gas, which is widely used among fuel gases, has methane as its main component, and is typically stored and transported in a liquefied gas state whose volume is reduced to 1/600.

On the other hand, conventionally, when the pressure of the evaporation gas generated in the storage tank exceeds a set value, the evaporation gas is re-liquefied and stored again in the storage tank to adjust the pressure inside the storage tank.

At this time, since the energy of the re-liquefaction facility is consumed a lot during re-liquefaction, there is a need to perform re-liquefaction more efficiently.

In addition, the vessel can provide a regasification facility for regasifying liquefied gas at sea and supplying natural gas directly to the demand. The regasification facility pressurizes the liquefied gas in the storage tank to high pressure, vaporizes it through the carburetor, and supplies it to the customer. At this time, seawater was supplied to the carburetor and was used to vaporize the liquefied gas.

However, since the temperature of the seawater is changed by external conditions, there is a need to increase the temperature of the seawater supplied to the carburetor consistently with a set value to supply it to the carburetor to increase the reliability of regasification performance.

As a technique related to the above, refer to Korean Patent Publication No. 10-2012-0103421 (published on September 19, 2012) and Korean Patent Publication No. 10-2012-0004229 (published on December 12, 2012).

Korean Patent Publication No. 10-2012-0103421 (published Sep. 19, 2012) Korean Patent Publication No. 10-2012-0004229 (published on December 12, 2012)

An embodiment of the present invention is to provide a liquefied gas regasification system that improves the efficiency of operation by utilizing the high temperature heat and cooling heat of the thermoelectric module to re-liquefy evaporation gas and vaporize liquefied gas.

According to an aspect of the present invention, a condenser performing a condensation operation using liquefied gas supplied from a storage tank; A high pressure pump that pressurizes the fluid condensed through the condenser to high pressure; A vaporizer for vaporizing the pressurized fluid using seawater; An ejector that ejects the vaporized fluid to suck the evaporation gas of the liquefied gas stored in the storage tank and discharges the mixed fluid; A thermoelectric module that receives power from a power supply and generates high temperature heat and cooling heat; A cooler that cools the discharged fluid using the cooling heat; And a heater that increases the temperature of seawater to be supplied to the vaporizer by using the high-temperature heat. A liquefied gas regasification system may be provided.

The fluid cooled through the cooler is supplied to the condenser, condensed by heat exchange with the liquefied gas, and a recovery line for storing a part of the condensed fluid through the condenser in the storage tank, and the liquefied gas in the storage tank It may further include a main supply line for supplying to the condenser, and supplying the other part of the fluid condensed through the condenser to the customer through the high pressure pump and the vaporizer.

The condensation line branching from the rear end of the carburetor of the main supply line to connect the ejector, cooler and condenser, and the boil-off gas of liquefied gas stored in the storage tank by the fluid supplied through the condensation line and passing through the ejector A suction line connecting the storage tank and the ejector to be sucked into the ejector, and a seawater supply line supplying seawater to the vaporizer via the heater may be further included.

The thermoelectric module includes a thermoelectric element that generates electricity by a temperature difference, a cooling fluid supply line branched from the rear end of the high-pressure pump of the main supply line, and a cooling fluid supply line supplying the pressurized fluid to the thermoelectric module, and the seawater supply line A seawater branch line branching from the front end of the heater to supply seawater to the thermoelectric module, and a power charging line supplying electricity generated from the thermoelectric module to the power supply by a temperature difference between the pressurized fluid and the seawater. And, it may further include a confluence line for confluencing the fluid vaporized by the heat exchange to the rear end of the vaporizer of the main supply line.

The cooling circuit may further include a first circulation line connecting the thermoelectric module and the cooler to circulate, and a second circulation line connecting the thermoelectric module and the heater to purify the high temperature heat.

The liquefied gas regasification system according to an embodiment of the present invention can improve the efficiency of operation by utilizing high-temperature heat and cooling heat of the thermoelectric module for re-liquefaction of evaporation gas and vaporization of liquefied gas.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will become apparent to those skilled in the art from the description of the claims.

1 shows a liquefied gas regasification system according to an embodiment of the present invention.
FIG. 2 adds a configuration for generating electricity due to a temperature difference by the thermoelectric module shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly describe the present invention, parts not related to the description are omitted in the drawings, and in the drawings, the width, length, and thickness of components may be exaggerated for convenience. Throughout the specification, the same reference numbers indicate the same components.

1 shows a liquefied gas regasification system according to an embodiment of the present invention.

The liquefied gas regasification system 100 according to an embodiment of the present invention uses the liquefied gas supplied from the storage tank 101 to condense 110 performing condensation work and the fluid condensed through the condenser 110. A high pressure pump (120) pressurized to high pressure, a vaporizer (130) for vaporizing the fluid pressurized by the high pressure pump (120) using seawater, and a vaporized fluid from the vaporizer (130) to eject it and store it in a storage tank Ejector 140 that sucks the evaporation gas of the liquefied gas stored in (101) and mixes and discharges the sucked evaporation gas and the vaporized fluid supplied from the vaporizer 130, and the power supply line from the power supply device 103 The thermoelectric module 150 that receives power through (L10) to generate high-temperature heat and cooling heat, and a cooler 160 that receives cooling heat from the thermoelectric module 150 to cool the fluid discharged from the ejector 140, and , High temperature heat from the thermoelectric module 150 It includes a heater 170 to increase the temperature of the seawater to be supplied to the vaporizer 130 is supplied.

Here, the fluid cooled through the cooler 160 is supplied to the condenser 110 and condensed by heat exchange with liquefied gas, and some of the fluid condensed through the condenser 110 is returned to the storage tank 101 in a recovery line ( It is stored through L7), the other part is passed through the high-pressure pump 120 and the carburetor 130 through the main supply line (L1), which will be described later, and is supplied toward the customer 102.

In addition, the liquefied gas regasification system 100 supplies the liquefied gas of the storage tank 101 to the condenser 110, and the fluid condensed through the condenser 110 through the high pressure pump 120 and the vaporizer 130 The main supply line (L1) to supply to the demand source (102) and the condensation line (branch from the rear end of the carburetor (130) of the main supply line (L1) to connect the ejector (140), cooler (160) and condenser (110) L2) and the storage tank 101 and the ejector so that the evaporation gas of the liquefied gas stored in the storage tank 101 is sucked into the ejector 140 by the fluid supplied through the condensation line L2 and passing through the ejector 140. It includes a suction line (L3) connecting the 140, and a seawater supply line (L4) for pumping the seawater through the seawater pump (P2) to the vaporizer 130 through the heater 170.

In addition, the liquefied gas regasification system 100 includes a first circulation line (L5) connecting the thermoelectric module 150 and the cooler 160 to circulate cooling heat, and a thermoelectric module 150 and a heater to purify high temperature heat. It includes a second circulation line (L6) connecting the 170.

The liquefied gas regasification system 100 includes various liquefied fuel carriers, liquefied fuel regasification vessels (RVs), container ships, commercial vessels, LNG FPSO (Floating, Production, Storage and Off-loading), LNG FSRU (Floating Storage and Regasification) Unit).

Hereinafter, each component and operation of the liquefied gas regasification system 100 will be described in detail with reference to FIG. 1.

The storage tank 101 may include a membrane type tank, an SPB type tank, a type C tank, etc. that store fuel in a liquefied state while maintaining an adiabatic state. The liquefied gas stored in the storage tank 101 may be any one of Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG), Dimethylether (DME), and Ethane, which can be stored in a liquefied state, but is not limited thereto. .

The internal pressure of the storage tank 101 may be maintained at 2 BARG or less for the membrane type tank when the stored liquefied gas is LNG, or approximately 1 bar for other tanks, or may be maintained at a pressure higher than that in consideration of fuel supply conditions. The internal temperature of the storage tank 101 may be maintained at approximately −163 ° C. to maintain the liquefied state of LNG.

The pump P1 inside the storage tank 101 supplies liquefied gas of the storage tank 101 to the condenser 110.

The condenser 110 uses the liquefied gas of the storage tank 101 to condense the introduced fluid. At this time, the introduced fluid is discharged through the ejector 140 and cooled through the cooler 160, the evaporation gas of the storage tank 101 sucked into the ejector 140 through the suction line (L3), and demand It contains some of the fuel supplied to (102).

Since the fluid supplied to the condenser 110 is cooled through the cooler 160 prior to it, the condenser 110 can effectively condense the fluid with less energy.

The high pressure pump 120 receives the condensed fluid through the condenser 110 and pressurizes it according to the supply condition of the demand destination 102.

The vaporizer 130 vaporizes the fluid pressurized by the high pressure pump 120. At this time, the carburetor 130 may vaporize the pressurized fluid by heat exchange with seawater, and supply it to the fuel of the demand destination 102 through the main supply line L1.

Some of the fluid vaporized by the vaporizer 130 is supplied to the ejector 140 through the condensation line (L2).

The ejector 140 ejects the fluid supplied through the condensation line L2 so that the boil-off gas of the liquefied gas stored in the storage tank 101 is sucked into the ejector 140 through the suction line L3.

Through this, the boil-off gas of the storage tank 101 can be effectively treated, and the pressure in the storage tank 101 can be properly maintained. In addition, the fuel having a high methane value can be supplied to the demander 102 by inhaling the evaporation gas of the storage tank 101 through the ejector 140.

The ejector 140 mixes the fluid supplied through the condensation line L2 and the evaporated gas supplied through the suction line L3 and discharges it to the cooler 160.

The thermoelectric module 150 receives power from the power supply device 103 to generate high-temperature heat and cooling heat. At this time, the generated cooling heat is supplied to the cooler 160 through the first circulation line L5.

The cooler 160 cools the fluid discharged from the ejector 140 described above using cooling heat and sends it to the condenser 110.

The heater 170 receives the high temperature heat generated by the thermoelectric module 150 through the second circulation line L6 and heats the seawater to be supplied to the vaporizer 130 described above to a set temperature. Through this, seawater having a constant temperature is supplied to the vaporizer 130, so that the amount of vaporization can be constantly adjusted.

As such, the performance of the condenser 110 and the vaporizer 130 and the efficiency of the entire system may be improved through the thermoelectric module 150.

The thermoelectric module 150 that supplies cooling heat and high temperature heat to the cooler 160 and the heater 170 may include a thermoelectric module (not shown). The thermoelectric element is a component that receives power and generates a temperature difference. The thermoelectric module 150 can use this to perform precise constant temperature control (PID control) according to the amount of power supplied. In addition, heating and cooling can be generated from time to time depending on the direction of the current. The thermoelectric element may be configured in such a way that n-type and p-type thermocouples are electrically connected in series and thermally parallel. An n-type semiconductor has excess electrons, and a p-type semiconductor is a semiconductor lacking electrons. When a potential difference is applied to both ends of the two metals, free electrons moving by electromotive force must absorb energy in order to move to a higher Fermi level. Heat is continuously absorbed and heat is continuously released from the opposite side. Using this Peltier effect, the thermoelectric element is heated and cooled at the same time, and can be generated by high temperature heat and cooling heat. In addition, as the intensity of the current increases, the difference in the temperature of the contact between the high and low temperature parts of the thermoelectric element increases, and the heating capacity and the cooling capacity show an increasing trend.

 Meanwhile, referring to FIG. 2, the thermoelectric element of the above-described thermoelectric module 150 may generate electricity due to a temperature difference. To this end, the liquefied gas regasification system 100 is branched from the rear end of the high pressure pump 120 of the main supply line (L1) to supply cooling fluid to supply the fluid pressurized by the high pressure pump 120 to the thermoelectric module 150 The line L11 and the seawater branch line L12 branched from the front end of the heater 170 of the seawater supply line L4 to supply seawater to the thermoelectric module 150, and the thermoelectric due to the temperature difference between the pressurized fluid and seawater The power charging line (L13) for supplying electricity generated from the module 150 to the power supply device (103) and the pressurized fluid vaporized by the heat exchange described above are joined to the rear end of the vaporizer (130) of the main supply line (L1). It may include a confluence line (L14). At this time, the difference in temperature between the pressurized fluid and seawater has a difference of approximately 150 degrees or more.

As described above, the amount of heat of the fluid and seawater that is pressurized through the thermoelectric module 150 is recovered, and electricity can be produced to improve efficiency and to be utilized in a system in a ship.

In the above, specific embodiments have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the invention pertains can perform various changes without departing from the gist of the technical spirit of the invention as set forth in the claims below. Will be able to.

101: storage tank 110: condenser
120: high pressure pump 130: carburetor
140: ejector 150: thermoelectric module
160: cooler 170: heater
L1: Main supply line L2: Condensation line
L3: Suction line L4: Sea water supply line
L5: First circulation line L6: Second circulation line
L7: Recovery line L10: Power supply line
L11: Cooling fluid supply line L12: Seawater branch line
L13: Electric power charging line L14: Confluence line

Claims (5)

A condenser performing a condensation operation using liquefied gas supplied from a storage tank;
A high pressure pump that pressurizes the fluid condensed through the condenser to high pressure;
A vaporizer for vaporizing the pressurized fluid using seawater;
An ejector that ejects the vaporized fluid to suck the evaporation gas of the liquefied gas stored in the storage tank and discharges the mixed fluid;
A thermoelectric module that receives power from a power supply and generates high temperature heat and cooling heat;
A cooler that cools the discharged fluid using the cooling heat; And
Liquefied gas regasification system comprising a; heater for raising the temperature of the sea water to be supplied to the vaporizer using the high temperature heat. According to claim 1,
The fluid cooled through the cooler is supplied to the condenser and condensed by heat exchange with the liquefied gas,
And a recovery line for storing a part of the fluid condensed through the condenser in the storage tank,
A liquefied gas regasification system further comprising a main supply line supplying liquefied gas of the storage tank to the condenser, and supplying another portion of the fluid condensed through the condenser to the demand destination through the high pressure pump and the vaporizer. According to claim 2,
A condensation line branched from the rear end of the vaporizer of the main supply line to connect the ejector, cooler and condenser;
A suction line connecting the storage tank and the ejector so that the evaporation gas of the liquefied gas stored in the storage tank is sucked into the ejector by the fluid supplied through the condensation line and passing through the ejector;
A liquefied gas regasification system further comprising a seawater supply line for supplying seawater to the vaporizer via the heater. According to claim 3,
The thermoelectric module includes a thermoelectric element that generates electricity by a temperature difference,
A cooling fluid supply line branched from the rear end of the high-pressure pump of the main supply line to supply the pressurized fluid to the thermoelectric module;
A seawater branch line branched from the front end of the heater of the seawater supply line to supply seawater to the thermoelectric module;
A power charging line for supplying electricity generated from the thermoelectric module to the power supply by a temperature difference between the pressurized fluid and the seawater;
Liquefied gas regasification system further comprising a confluence line for confluencing the fluid vaporized by the heat exchange to the rear end of the vaporizer of the main supply line. According to claim 1,
A first circulation line connecting the thermoelectric module and the cooler to circulate the cooling heat,
A liquefied gas regasification system further comprising a second circulation line connecting the thermoelectric module and the heater to purify the high temperature heat.

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