# US 2014/0150470 A1 · Method and system for treating a liquefied gas

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- Number: US 2014/0150470 A1
- Document ID: US20140150470A1
- Status: Published application
- Kind: A1
- Application number: 14/131,675
- Filed: 2013-05-14
- Published: 2014-06-05
- Earliest claimed: 2012-05-14
- Assignees: Hyundai Heavy Industries Co., Lt.
- Applicants: Hyundai Heavy Industries Co., Lt.
- Inventors: Ju Seog Han; Eun Sung Baek
- Web page: https://patentgrep.com/patent/US20140150470A1

## CPC

- F17C 7/02: Discharging liquefied gases
- F02M 21/06: Apparatus for de-liquefying, e.g. by heating
- F17C 7/04: with change of state, e.g. vaporisation
- F17C 9/00: Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C 9/02: with change of state, e.g. vaporisation
- F17C 13/025: {having the pressure as the parameter}
- F17C 13/026: {having the temperature as the parameter}
- F28F 19/006: {Preventing deposits of ice}
- F28F 23/02: Arrangements for obtaining or maintaining same in a liquid state
- F28F 27/00: Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus (control arrangements in general G05)
- C10L 3/12: Liquefied petroleum gas {(liquefying by pressure and cold treatment F25J)}
- F02M 21/0215: {Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas}
- F02M 21/0245: {High pressure fuel supply systems; Rails; Pumps; Arrangement of valves}
- F02M 21/0284: {Arrangement of multiple injectors or fuel-air mixers per combustion chamber}
- F17C 2221/033: Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
- F17C 2221/035: Propane butane, e.g. LPG, GPL
- F17C 2223/0153: Liquefied gas, e.g. LPG, GPL
- F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG
- F17C 2223/033: Small pressure, e.g. for liquefied gas
- F17C 2225/035: High pressure, i.e. between 10 and 80 bars
- F17C 2227/0135: Pumps
- F17C 2227/0302: by heating
- F17C 2227/0323: in a closed loop
- F17C 2250/043: Pressure
- F17C 2250/0439: Temperature
- F17C 2250/0456: Calorific or heating value
- F17C 2250/0631: Temperature
- F17C 2250/0636: Flow or movement of content
- F17C 2250/0652: Calorific or heating value
- F17C 2250/0694: with calculations
- F17C 2270/0139: Fuel stations
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- 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 (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed is a liquefied gas processing system and method. A liquefied gas treatment system includes: a liquefied gas supply line connected from a liquefied gas storing tank to a source of demand, a pump provided on the liquefied gas supply line, and configured to pressurize liquefied gas discharged from the liquefied gas storing tank, a heat exchanger provided on the liquefied gas supply line between the source of demand and the pump, and configured to heat exchange the liquefied gas supplied from the pump with heat transfer media, a media heater configured to heat the heat transfer media, a media circulation line connected from the media heater to the heat exchanger, and a controller configured to change a flow rate of the heat transfer media flowing into the media heater or calories supplied to the heat transfer media by the media heater on the basis of a flow rate of the liquefied gas supplied to the heat exchanger.

## Claims

### Claim 1

A liquefied gas treatment system for, comprising:
a liquefied gas supply line connected from a liquefied gas storing tank to a source of demand;
a pump provided on the liquefied gas supply line and configured to pressurize liquefied gas discharged from the liquefied gas storing tank;
a heat exchanger provided on the liquefied gas supply line between the source of demand and the pump, and configured to exchange heat between the liquefied gas supplied from the pump and heat transfer media;
a media heater configured to heat the heat transfer media;
a media circulation line connected from the media heater to the heat exchanger; and
a controller configured to change a flow rate of the heat transfer media flowing into the media heater or calories supplied to the heat transfer media by the media heater on the basis of a flow rate of the liquefied gas supplied to the heat exchanger.

### Claim 2 (depends on 1)

The system of claim 1, further comprising:
a calorie calculator configured to calculate the flow rate of the liquefied gas supplied to the heat exchanger and calculate necessary calories of the heat transfer media on the basis of the flow rate of the liquefied gas and a state of the liquefied gas demanded by the source of demand,
wherein the controller receives the necessary calories of the heat transfer media from the calorie calculator and changes the flow rate of the heat transfer media flowing into the media heater or the calories supplied to the heat transfer media by the media heater.

### Claim 3 (depends on 2)

The system of claim 2, wherein the calorie calculator calculates the flow rate of the liquefied gas on the basis of a driving degree of the pump.

### Claim 4 (depends on 3)

The system of claim 3, wherein the driving degree of the pump is RPM of the pump.

### Claim 5 (depends on 2)

The system of claim 2, further comprising;
a liquefied gas temperature sensor provided on the liquefied gas supply line and configured to measure a temperature of the liquefied gas,
wherein the calorie calculator calculates the necessary calories of the heat transfer media by using the flow rate of the liquefied gas, the temperature of the liquefied gas, and a demanded temperature of the liquefied gas by the source of demand.

### Claim 6 (depends on 5)

The system of claim 5, wherein the liquefied gas temperature sensor is provided between the pump and the heat exchanger on the liquefied gas supply line.

### Claim 7 (depends on 1)

The system of claim 1, further comprising:
a branch line configured to cause at least some of the heat transfer media to be branched from the media circulation line and bypass the media heater,
wherein the controller adjusts a flow rate of the heat transfer media flowing into the branch line through a bypass adjusting valve provided on the branch line.

### Claim 8 (depends on 1)

The system of claim 1, further comprising:
a media tank configured to store the heat transfer media; and
a media pump configured to supply the heat transfer media, stored in the media tank, to the media heater,
wherein the controller controls a flow rate of the heat transfer media supplied to the media heater from the media pump by controlling driving of the media pump.

### Claim 9 (depends on 1)

The system of claim 1, further comprising:
a heat source supply line configured to supply a heat source to the media heater; and
a heat source supply valve provided on the heat source supply line and configured to adjust a degree of opening of the heat source supply line,
wherein the controller controls the amount of heat sources supplied to the heat transfer media by the media heater by controlling the degree of opening of the heat source supply valve.

### Claim 10 (depends on 1)

The system of claim 1, wherein the heat transfer media are glycol water.

### Claim 11

A liquefied gas treatment method in association with a method of driving a liquefied gas treatment system, which pressurizes liquefied gas with a pump, heats the liquefied gas with heat transfer media in a heat exchanger, and supplies the heated liquefied gas to a source of demand, in such a manner that a media heater heats the heat transfer media and supplies the heated heat transfer media to the heat exchanger, the method comprising:
calculating a flow rate of the liquefied gas supplied to the heat exchanger; and
changing a flow rate of the heat transfer media flowing into the media heater or calories supplied to the heat transfer media by the media heater on the basis of a flow rate of the liquefied gas.

### Claim 12 (depends on 11)

The liquefied gas treatment method of claim 11, further comprising:
calculating necessary calories of the heat transfer media to be supplied to the heat exchanger on the basis of a state of the liquefied gas demanded by the source of demand,
wherein the changing of the flow rate of the heat transfer media or the calories supplied to the heat transfer media includes changing the flow rate of the heat transfer media flowing into the media heater or the calories supplied to the heat transfer media by the media heater according to the necessary calories of the heat transfer media.

### Claim 13 (depends on 11)

The liquefied gas treatment method of claim 11, wherein the calculating of the flow rate of the liquefied gas includes calculating the flow rate on the basis of a driving degree of the pump.

### Claim 14 (depends on 13)

The liquefied gas treatment method of claim 13, wherein the driving degree of the pump is RPM of the pump.

### Claim 15 (depends on 12)

The liquefied gas treatment method of claim 12, further comprising:
measuring a temperature of the liquefied gas,
wherein the calculating of the necessary calories includes calculating the necessary calories of the heat transfer media on the basis of the flow rate of the liquefied gas, the temperature of the liquefied gas, and the state of the liquefied gas demanded by the source of demand.

### Claim 16 (depends on 15)

The liquefied gas treatment method of claim 15, wherein the measuring of the temperature includes measuring the temperature of the liquefied gas between the pump and the heat exchanger.

### Claim 17 (depends on 11)

The liquefied gas treatment method of claim 11, wherein the changing of the flow rate of the heat transfer media includes causing at least some of the heat transfer media to bypass the media heater, in such a manner that the flow rate of the heat transfer media, bypassing the media heater, is controlled.

### Claim 18 (depends on 11)

The liquefied gas treatment method of claim 11, wherein the changing of the flow rate of the heat transfer media includes controlling driving of the media pump supplying the heat transfer media to the media heater.

### Claim 19 (depends on 11)

The liquefied gas treatment method of claim 11, wherein the changing of the calories supplied to the heat transfer media includes controlling an amount of heat sources supplied to the heat transfer media flowing into the media heater.