WO2017209492A1 - Système de traitement de gaz et navire le comprenant - Google Patents

Système de traitement de gaz et navire le comprenant Download PDF

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Publication number
WO2017209492A1
WO2017209492A1 PCT/KR2017/005643 KR2017005643W WO2017209492A1 WO 2017209492 A1 WO2017209492 A1 WO 2017209492A1 KR 2017005643 W KR2017005643 W KR 2017005643W WO 2017209492 A1 WO2017209492 A1 WO 2017209492A1
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WIPO (PCT)
Prior art keywords
gas
boil
compressor
liquefied
storage tank
Prior art date
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PCT/KR2017/005643
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English (en)
Korean (ko)
Inventor
이준호
고준호
임원섭
홍원종
최훈
김현석
김주일
Original Assignee
현대중공업 주식회사
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Priority claimed from KR1020160179559A external-priority patent/KR101913015B1/ko
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Publication of WO2017209492A1 publication Critical patent/WO2017209492A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • 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
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • 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

Definitions

  • the present invention relates to a gas treatment system and a vessel comprising the same.
  • liquefied gas such as liquefied natural gas and liquefied petroleum gas has been widely used in place of gasoline or diesel according to technology development.
  • Liquefied natural gas is liquefied by cooling methane obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid.
  • Liquefied petroleum gas is a liquid fuel made by compressing a gas mainly composed of propane (C3H8) and butane (C4H10), which come with oil from an oil field, at room temperature.
  • Liquefied petroleum gas like liquefied natural gas, is colorless and odorless and is widely used as a fuel for household, business, industrial, and automobile use.
  • Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean, and liquefied natural gas is liquefied to a volume of 1/600.
  • the liquefied petroleum gas is reduced by the liquefied propane is 1/260, butane is reduced to a volume of 1/230 has the advantage of high storage efficiency.
  • the temperature, pressure, and the like required for driving the engine using such a liquefied gas as fuel may be different from the state of the liquefied gas stored in the tank.
  • boil off gas (BOG)
  • LNG when LNG is stored in the liquid phase, heat permeation occurs in the tank, so that some LNG is vaporized to generate boil off gas (BOG), which may cause problems in the liquefied gas treatment system.
  • BOG boil off gas
  • the present invention has been made to improve the prior art, and an object of the present invention is to provide a gas treatment system and a vessel including the same, which effectively supply liquefied gas and / or boil-off gas to a demand destination in a liquefied gas storage tank, and / Another object is to provide a gas treatment system having a layout optimized on board and a vessel comprising the same.
  • the pressurized evaporation gas generated in the liquefied gas storage tank is supplied to the demand destination, provided with a plurality of boil-off gas compressor built in parallel with each other; And a controller configured to control the boil-off gas compressor according to the boil-off gas generated in the liquefied gas storage tank, wherein the controller is configured to compress at least one of the boil-off gas compressors according to the boil-off gas generated by compression of the boil-off gas. It is characterized by controlling to a standby state not implemented.
  • the boil-off gas compressor is provided with a constituent compressor in which four or five stage pistons are connected in series, and four constituent compressors may be provided in parallel to each other.
  • control unit receives the evaporation gas generation amount measured from the evaporation gas generation sensor, the evaporation It is possible to control the driving of the gas compressor.
  • the controller controls one of the boil-off gas compressors to the standby state, and the remaining boil-off gas compressors connected in parallel. Can be controlled to increase the load.
  • an evaporation gas heat exchanger for heat-exchanging the boil-off gas supplied from the liquefied gas storage tank and the boil-off gas compressed by the boil-off gas compressor; And a bypass line for bypassing the boil-off gas heat exchanger, wherein the controller is further configured to supply the boil-off gas supplied from the liquefied gas storage tank to the boil-off gas through the bypass line when the amount of boil-off gas is less than or equal to the predetermined amount.
  • Bypassing the boil-off gas heat exchanger is controlled to be supplied to the boil-off gas compressor, when the boil-off gas generation amount is greater than the preset generation amount, the boil-off gas supplied from the liquefied gas storage tank is evaporated through the boil-off gas heat exchanger
  • the compressed boil-off gas in the gas compressor can be partially reliquefied.
  • the preset generation amount is the amount of boil-off gas introduced into the boil-off gas compressor at the point of inefficiency of the boil-off gas compressor, and the point of inefficiency of the boil-off gas compressor is the ratio of power consumption to the flow rate of the boil-off gas compressor. Even if the flow rate supplied to the boil-off gas compressor is reduced, it may be a point at which power consumption is not reduced.
  • the load amount at the inefficiency point of the boil-off gas compressor may be a flow rate of 20 to 40% of the flow rate of the boil-off gas compressor having the maximum load.
  • an evaporation gas decompressor for decompressing the heat exchanged evaporated gas supplied from the evaporation gas heat exchanger; And a gas-liquid separator which receives the reduced-pressure evaporated gas from the boil-off gas reducer and separates the liquid-liquid and the gas phase.
  • the demand destination high pressure demand destination for consuming 150 to 350 bar of high pressure evaporation gas; And it may include a low pressure demand destination for consuming low pressure boil-off gas of 4 to 8 bar.
  • the boil-off gas supply line having the boil-off compressor;
  • An evaporating gas branching line branched from an intermediate stage of the evaporating gas compressor on the evaporating gas supply line to connect the low pressure demand destination;
  • a boil-off gas first return line branched after the boil-off gas compressor of the boil-off gas supply line to connect the boil-off gas heat exchanger;
  • a second boil-off gas connecting the boil-off gas heat exchanger and the gas-liquid separator, and including the boil-off gas reducer;
  • a flash gas supply line connecting upstream of the gas-liquid separator and the boil-off gas heat exchanger on the boil-off gas supply line;
  • a reliquefaction gas return line connecting the gas-liquid separator and the liquefied gas storage tank.
  • the boil-off gas generation sensor may calculate the boil-off gas generation amount through the internal pressure of the liquefied gas storage tank.
  • the boil-off gas compressor may be a standard high pressure compressor.
  • it may be a ship comprising the gas treatment system.
  • the gas treatment system and the ship including the same have an effect of effectively supplying liquefied gas and / or boil-off gas to a demand destination in a liquefied gas storage tank to increase system stability and reliability, and the gas treatment system optimizes the space on board. By being arranged so as to have an effect onboard space utilization is improved.
  • FIG. 1 is a conceptual diagram of a gas treatment system according to an embodiment of the present invention.
  • FIG. 2 is a conceptual diagram of a gas treatment system according to another embodiment of the present invention.
  • FIG. 3 is a conceptual diagram of a gas treatment system according to another embodiment of the present invention.
  • Figure 4 is a graph of the power consumption compared to the flow rate of the boil-off gas compressor according to an embodiment of the present invention.
  • FIG. 5 is a graph of the amount of boil-off gas generated in the liquefied gas storage tank compared to the operating time of the ship according to an embodiment of the present invention.
  • FIG. 6 is a side view of a vessel equipped with a gas treatment system according to an embodiment of the present invention.
  • FIG. 7 is an interior plan view of a cargo compressor room of a ship according to an embodiment of the present invention.
  • FIG. 8 is an interior plan view of a cargo compressor room of a ship according to another embodiment of the present invention.
  • FIG. 9 is an internal cross-sectional view of a cargo compressor room of a ship according to another embodiment of the present invention.
  • FIG. 10 is a modified cross-sectional interior view of a cargo compressor room of a ship according to another embodiment of the present invention.
  • the liquefied gas may be LPG, LNG, ethane, etc.
  • LNG Liquefied Natural Gas
  • BOG Air Off Gas
  • Liquefied gas may be referred to regardless of the change of state, such as liquid state, gas state, liquid and gas mixed state, subcooled state, supercritical state, etc., it is also known that evaporated gas is the same.
  • the present invention is not limited to the liquefied gas to be treated, it may be a liquefied gas treatment system and / or boil-off gas treatment system, it is apparent that the system of each of the drawings to be described below can be applied to each other.
  • the mixed fluid described below may be a mixed boil-off gas or a fluid containing at least some liquid phase.
  • the embodiments of the gas treatment system 2 of the present invention may be configured in combination with each other, and of course, the addition of the respective components may be made to cross each other.
  • the gas treatment system 2 according to the embodiment of the present invention may be mounted on the hull (H), in this case, the vessel 1 may be a vessel such as an LNG carrier, a container carrier, but is not limited thereto.
  • FIG. 1 is a conceptual diagram of a gas treatment system according to an embodiment of the present invention.
  • the gas treatment system 2 includes a liquefied gas storage tank 10, a boil-off gas heat exchanger 20, a boil-off gas pressure reducer 30, and a gas-liquid separator. 40, first to fourth boil-off compressors 51 to 54, a first demand destination 71, a second demand destination 72, a first control unit 90, and a second control unit 91.
  • the flow path may be a line through which the fluid flows, but is not limited thereto, and any flow path may be used.
  • the boil-off gas may further include a second return line L4, a reliquefaction return line L5, a flash gas supply line L6, and a boil-off gas bypass line L7.
  • Each line may be provided with valves (not shown) that can adjust the opening degree, and the supply amount of the boil-off gas may be controlled by adjusting the opening degree of each valve.
  • the boil-off gas supply line L1 connects the liquefied gas storage tank 10 and the first demand destination 71 and includes an boil-off gas heat exchanger 20 and first to fourth boil-off compressors 51 to 54.
  • the boil-off gas generated in the liquefied gas storage tank 10 may be supplied to the first demand destination 71.
  • the boil-off gas supply line L1 may connect the first to fourth boil-off gas compressors 51 to 54 in parallel.
  • the boil-off gas supply line L1 may include a boil-off gas first flow valve 81a upstream of the boil-off gas heat exchanger 20, and heat-exchange the boil-off gas through the boil-off gas first flow valve 81a.
  • the flow rate of the boil-off gas supplied to the machine 20 can be controlled.
  • the first boil-off gas flow rate valve 81a may be connected to the first controller 90 in a wired or wireless manner to receive an opening degree adjustment command of the first controller 90.
  • the boil-off gas first return line L2 is branched from the rear end of the first to fourth boil-off gas compressors 51 to 54 on the boil-off gas supply line L1 and connected to the boil-off gas heat exchanger 20. At least a portion of the boil-off gas compressed by the fourth to boil-off gas compressors 51 to 54 may be supplied to the boil-off gas heat exchanger 20.
  • Boil off gas branch line (L3) is. Branched at an intermediate end of the first to fourth boil-off gas compressors 51 to 54 on the boil-off gas supply line L1 and connected to the second demand destination 72, the first to fourth boil-off gas compressors 51 to 54. ) Can be supplied to the second demand destination (72).
  • the boil-off gas branch line L3 is illustrated as being branched between the first and second ends of the fourth boil-off gas compressor 54, but is not limited thereto. Of course, it can be branched between each of the first stage and the second stage. Through this, the boil-off gas branch line L3 may supply the boil-off gas compressed at a pressure of 2 to 6 bar to the second demand destination 72.
  • the boil-off gas second return line L4 connects the boil-off gas heat exchanger 20 and the gas-liquid separator 40 and includes a boil-off gas decompressor 30, and the boil-off gas heat-exchanged in the boil-off gas heat exchanger 20.
  • the pressure can be supplied to the gas-liquid separator 40 by reducing the pressure with the boil-off gas decompressor 30.
  • the reliquefaction return line L5 connects the gas-liquid separator 40 and the liquefied gas storage tank 10, and supplies the liquid phase separated from the gas-liquid separator 40 to the liquefied gas storage tank 10.
  • the flash gas supply line L6 may be connected to an upstream of the gas-liquid separator 40 and the boil-off gas heat exchanger 20 on the boil-off gas supply line L1, and supplies the gaseous phase separated from the gas-liquid separator 40 to the boil-off gas. Join line L1.
  • the boil-off gas bypass line L7 is branched upstream of the boil-off gas heat exchanger 20 on the boil-off gas supply line L1 and connected to the boil-off gas heat exchanger 20 on the boil-off gas supply line L1 and evaporated.
  • a gas flow rate valve 81b is provided so that the boil-off gas supplied from the liquefied gas storage tank 10 bypasses the boil-off gas heat exchanger 20 to the first to fourth boil-off gas compressors 51 to 54. Can be supplied.
  • the second boil-off gas flow rate valve 81b may be connected to the first controller 90 in a wired or wireless manner to receive an opening degree adjustment command of the first controller 90.
  • the liquefied gas storage tank 10 stores the liquefied gas to be supplied to the first and second demand destinations 71 and 72.
  • the liquefied gas storage tank 10 should store the liquefied gas in a liquid state, where the liquefied gas storage tank 10 may have a pressure tank form.
  • the liquefied gas storage tank 10 is disposed inside the hull H, and may be formed in four, for example, in front of the engine room (not shown).
  • the liquefied gas storage tank 10 is, for example, a membrane type tank, but not limited thereto, and various types such as a stand-alone tank are not particularly limited.
  • the boil-off gas heat exchanger (20) is provided between the liquefied gas storage tank (10) and the first to fourth boil-off gas compressors (51 to 54) on the boil-off gas supply line (L1).
  • the supplied boil-off gas and the boil-off gas compressed by the first to fourth boil-off compressors 51 to 54 may be heat-exchanged.
  • the boil-off gas compressed by the first to fourth boil-off gas compressors 51 to 54 of the boil-off gas exchanged by the boil-off gas heat exchanger 20 is supplied to the boil-off gas decompressor 30, and the boil-off gas heat exchanger 20
  • the boil-off gas supplied from the liquefied gas storage tank 10 of the boil-off gas heat exchanged in) may be supplied to the first to fourth boil-off gas compressors 51 to 54.
  • the boil-off gas compressed by the first to fourth boil-off gas compressors 51 to 54 may be partially reliquefied by receiving cold heat from the boil-off gas supplied from the liquefied gas storage tank 10, and liquefied gas storage tank.
  • the boil-off gas supplied from 10 is preheated before being supplied to the first to fourth boil-off gas compressors 51 to 54 by receiving a heat source from the boil-off gas compressed in the first to fourth boil-off gas compressors 51 to 54. Can be.
  • the boil-off gas decompressor 30 depressurizes or expands the boil-off gas pressurized by the first to fourth boil-off gas compressors 51 to 54 and heat-exchanged in the boil-off gas heat exchanger 20 to liquefy at least a portion.
  • the boil-off gas decompressor 30 may reduce the boil-off gas of 150 to 350 bar to 1 bar to 10 bar, and the boil-off gas may be reduced to 1 bar when the boil-off gas is liquefied and transferred to the liquefied gas storage tank 10. At reduced pressure, the evaporated gas may achieve a cooling effect.
  • the boil-off gas pressurized by the first to fourth boil-off gas compressors 51 to 54 is cooled by heat-exchanging with the boil-off gas supplied from the liquefied gas storage tank 10 in the boil-off gas heat exchanger 20.
  • the pressure may maintain the discharge pressure discharged from the first to fourth boil-off gas compressors 51 to 54.
  • the present embodiment uses high pressure even after the boil-off gas pressurized by the first to fourth boil-off gas compressors 51 to 54 is heat-exchanged in the boil-off gas heat exchanger 20 to receive cold heat.
  • the boil-off gas may be further reduced by reducing the boil-off gas through the boil-off gas reducer 30.
  • the boil-off gas pressurized by the first to fourth boil-off gas compressors 51 to 54 may be partially liquefied in the boil-off gas heat exchanger 20, but finally completely liquefied in the boil-off gas decompressor 30.
  • the boil-off gas may be pressurized in the first to fourth boil-off gas compressors 51 to 54 to have a pressure of 150 to 350 bar, and the temperature may be about 45 degrees.
  • the boil-off gas raised to a temperature of about 45 degrees is recovered by the boil-off gas heat exchanger 20 and heat-exchanged with the boil-off gas around -100 degrees supplied from the liquefied gas storage tank 10, and cooled to a temperature of around -97 degrees.
  • the boil-off gas decompressor (30) is supplied to the boil-off gas decompressor (30).
  • the boil-off gas in the boil-off gas decompressor 30 is cooled by the reduced pressure may have a pressure of about 1bar and a temperature of about -162.3 degrees.
  • the boil-off gas since the boil-off gas has a temperature lower than ⁇ 162 degrees due to the reduced pressure of the boil-off gas through the boil-off gas decompressor 30, the boil-off gas liquefaction rate of about 30 to 40% can be realized. This is because the larger the pressure range of the reduced pressure of the boil-off gas can increase the cooling effect of the boil-off gas.
  • the boil-off gas pressure reducer 30 may be made of a Joule-Thomson Valve.
  • the boil-off gas decompressor 30 may be formed of an expander (expander).
  • the inflator can be driven without using extra power.
  • the efficiency of the gas treatment system 2 can be improved.
  • Power transmission may be achieved, for example, by gear connection or after electric conversion.
  • the gas liquid separator 40 temporarily stores the reduced or expanded evaporated gas in the boil-off gas decompressor 30 and separates the boil-off gas into liquid and gas through gravity.
  • the gas is then a flash gas and the temperature is approximately -162.3 degrees.
  • the flash gas and the -100 degrees evaporated gas generated in the liquefied gas storage tank 10 are mixed upstream of the evaporative gas heat exchanger 20 to be a mixed gas having a temperature of -110 to -120 degrees (about -114 degrees).
  • the mixed gas may be introduced into the boil-off gas heat exchanger 20 in a state having a temperature of -110 to -120 degrees (about -114 degrees).
  • the 45 degree boil-off gas recovered along the boil-off gas first return line L2 exchanges heat with -110 to -120 degree mixed gas supplied from the boil-off gas heat exchanger 20 through the boil-off gas supply line L1.
  • additional cooling of the boil-off gas can be realized in contrast to the absence of flash gas recovery (45-degree boil-off gas exchanges with -100-degree boil-off gas).
  • the evaporated gas discharged from the boil-off gas heat exchanger 20 and introduced into the boil-off gas decompressor 30 may be about -112 degrees, which is lower than that of no flash gas circulation (about -97 degrees).
  • the pressure When the pressure is reduced by the pressure reducer 30, the pressure may be cooled to about ⁇ 163.7 degrees. In this case, more evaporated gas may be liquefied by the evaporating gas decompressor 30 and recovered to the liquefied gas storage tank 10 than there is no flash gas circulation.
  • the boil-off gas is separated into a liquid and a gas so that the liquid is supplied to the liquefied gas storage tank 10, and the gas is flash gas upstream of the first to fourth boil-off compressors 51 to 54. Can be recovered.
  • the boil-off gas when the boil-off gas is separated into liquid and gas in the gas-liquid separator 40, the liquefied boil-off gas (liquid) and the flash gas (gas) are respectively liquefied gas storage tank 10 through the re-liquefied gas return line (L5). ), Or upstream of the boil-off gas heat exchanger 20 through the flash gas supply line L6.
  • the gas-liquid separator 40 in the present embodiment recovers the liquefied boil-off gas to the liquefied gas storage tank 10, and recovers the flash gas generated by the gas-liquid separator 40 upstream of the boil-off gas heat exchanger 20.
  • the excess evaporated gas can be re-liquefied and re-stored in the liquefied gas storage tank 10.
  • the first and fourth evaporated gas compressors 51 to 54 can be repressurized without discarding the flash gas. 2 can be reused as a demand source (71, 72).
  • the first to fourth boil-off gas compressors 51 to 54 pressurize the boil-off gas generated in the liquefied gas storage tank 10 and supply the boil-off gas to the first and second demand destinations 71 and 72, and supply the boil-off gas supply line ( It is provided in parallel with each other on L1).
  • the first to fourth boil-off gas compressors 51 to 54 are connected in series to a plurality of stages (pistons) to pressurize the boil-off gas in multiple stages.
  • the first to fourth boil-off compressors 51 to 54 have a structure in which four or five pistons are connected in series, that is, a structure connected in series in four or five stages, and the boil-off gas is discharged at the final stage. It can be compressed and discharged to 350 bar (preferably approximately 306 bar) and supplied to the first demand destination 71.
  • the boil-off gas first return line L2 is branched between the first to fourth boil-off gas compressors 51 to 54 on the boil-off gas supply line L1 and the first demand destination 72, so that the boil-off gas heat exchanger ( 20).
  • the branch point on the boil-off gas supply line (L1) may be provided with a valve (not shown), the valve to the flow rate of the boil-off gas supplied to the first demand source 71 or the boil-off gas heat exchanger 20 It is possible to control the flow rate of the boil-off gas supplied, it may be a three-way valve.
  • the first to fourth boil-off gas compressors 51 to 54 may be provided with boil-off gas coolers (not shown) between the stages.
  • boil-off gas coolers not shown
  • the boil-off gas cooler may be installed in the same number as each stage of the first to fourth boil-off compressors 51 to 54, and each boil-off gas cooler is downstream of each stage of the first to fourth boil-off compressors 51 to 54. Can be provided.
  • first to fourth boil-off gas compressors 51 to 54 may be a boil-off gas compressor for room temperature, wherein the temperature of the boil-off gas sucked in the first stage is minus 40 degrees to minus 20 degrees.
  • a separate heating device (not shown) is required at the front end of the first to fourth boil-off compressors 51 to 54.
  • the heating device may increase the temperature of the evaporation gas of approximately 110 degrees below zero generated from the liquefied gas storage tank 10 to 40 degrees below zero and 20 degrees below zero, thereby introducing the first to fourth evaporative gas compressors 51 to 54. .
  • the boil-off gas branch line L3 is branched so that the second demand source 72 and Can be connected.
  • the boil-off gas discharged from the first stage of the first to fourth boil-off gas compressors 51 to 54 may be compressed to a low pressure of 4 bar to 6 bar, and may be supplied to the second demand destination 72.
  • first to fourth boil-off gas compressors 51 to 54 may be, for example, a standard high pressure compressor (SHP compressor).
  • SHP compressor standard high pressure compressor
  • the cylinder is formed in a V-shape, can be formed so that the size of the compressor itself is significantly reduced, thereby significantly reducing the space occupied by the compressor.
  • the first demand destination 71 uses evaporated gas or liquefied gas as a fuel from the liquefied gas storage tank 10.
  • the first demand destination 71 may be a high-pressure gas injection engine (eg, MEGI), and in the case of the MEGI engine, the boil-off gas pressurized to a high pressure of about 150 to 350 bar may be used as a fuel.
  • MEGI high-pressure gas injection engine
  • a crank shaft (not shown) connected to the piston As the first demand destination 71 reciprocates the piston (not shown) inside the cylinder (not shown) by combustion of liquefied gas or evaporated gas, a crank shaft (not shown) connected to the piston is rotated. , The propeller shaft (S) connected to the crank shaft can be rotated. Therefore, as the propeller P connected to the propeller shaft S rotates when the first demand destination 71 is driven, the hull H may move forward or backward.
  • the first demand destination 71 is a two-stroke DF engine which is usually driven by a diesel cycle and may be a low speed engine.
  • a diesel cycle basically, air is compressed by a piston, and the compressed hot air is ignited by a pilot fuel, and the remaining high-pressure gas is injected to explode.
  • the ignition fuel uses HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil), the ratio of the ignition fuel and the high-pressure gas is about 5:95, the injection amount of the ignition fuel is adjusted to 5 ⁇ 100%. It is possible.
  • the ignition fuel is therefore also available as a driving fuel for the engine.
  • evaporated gas or heated liquefied gas; about 95%) is mainly used as the engine driving fuel, and when the injection amount of the ignition fuel is 100%, the engine driving fuel is ignited.
  • the fuel (oil) is used up.
  • the injection amount of the ignition fuel is about 50% (and about 50% of the boil-off gas)
  • the ignition fuel and the boil-off gas are not mixed and flow into the engine, but the ignition fuel ignites first to produce a calorific value, and then the remaining evaporation.
  • the gas is introduced and exploded to produce a calorific value to produce a calorific value necessary for driving the first demand destination 71.
  • the second demand destination 72 uses the evaporated gas supplied from the liquefied gas storage tank 10 as a fuel. That is, the second demand destination 72 requires the boil-off gas and can be driven using it as a raw material.
  • the second demand destination 72 may be a generator (for example, DFDG), a gas combustion device (GCU), or a boiler (for example, a boiler for generating steam), but is not limited thereto.
  • the second demand destination 72 may be connected through the first to fourth boil-off gas compressors 51 to 54 and the boil-off gas branch line L3, and the first to fourth boil-off gas compressors 51 to 54.
  • the first stage of the) can be used as a fuel by receiving a compressed boil-off gas at a low pressure (2 to 8 bar; preferably 4 to 6 bar).
  • the second consumer 72 may be a heterogeneous fuel engine capable of using heterogeneous fuels, and may use oil as fuel as well as evaporated gas, but the evaporated gas or oil is not supplied without being mixed with the evaporated gas and the oil is selected. Can be supplied. This is to prevent two materials having different combustion temperatures from being mixed and supplied, thereby preventing the efficiency of the second consumer 72 from falling.
  • the second consumer 72 may generate fresh steam by heating fresh water as a boiler, and store the generated steam in a separate steam storage medium.
  • the boiler 72 may supply the generated steam to a heater (shown in FIGS. 2 and 3; 61) or a forced vaporizer (shown in FIG. 3; 62), through which the heater 61 or forced vaporizer ( Allow 62 to heat the boil-off gas.
  • a heater shown in FIGS. 2 and 3; 61
  • a forced vaporizer shown in FIG. 3; 62
  • the evaporation gas generation measurement sensor 85, the evaporation gas bypass first to fourth lines BL1 to BL4, a pressure sensor 831, and a flow rate sensor 832 may be further included.
  • the boil-off gas generation amount measuring sensor 85 may measure the amount of boil-off gas generated in the liquefied gas storage tank 10, and may be located in the liquefied gas storage tank 10 according to the internal pressure of the liquefied gas storage tank 10. The amount of generated boil-off gas generated in the liquefied gas storage tank 10 may be calculated based on the remaining boil-off gas properties.
  • the boil-off gas generation amount measurement sensor 85 may transmit the boil-off gas generation amount information measured by being connected to the first control unit 90 by wire or wirelessly, to the first control unit 90.
  • Boil-off gas bypass 1st-4th line BL1-BL4 are the 1st-4th boil-off gas compressor on the boil-off gas supply line L1 provided with the 1st-4th boil-off gas compressor 51-54, respectively. Branches at each rear end 51 to 54 may connect front ends of the first to fourth boil-off gas compressors 51 to 54.
  • boil-off gas bypass first to fourth lines BL1 to BL4 are controlled by the first to fourth boil-off gas compressors 51 to 54 under the control of the first and second control units 90 and 91 which will be described later. At least a part of the discharged boil-off gas may be bypassed (returned) to the front end of the first to fourth boil-off compressors 51 to 54.
  • the boil-off gas bypass first to fourth lines BL1 to BL4 are first to fourth when the preset time exceeds the first to fourth boil-off gas compressors 51 to 54 in the operation standby state.
  • the boil-off gas compressors 51 to 54 are operable (controlled by the first control unit 90), and at the same time, the discharge degree in the first to fourth boil-off gas compressors 51 to 54 is the pressure of the boil-off gas or The flow rate can be adjusted. (Control by the second control unit 91)
  • the boil-off gas bypass first line BL1 includes a pressure control valve 841 for adjusting the pressure of the boil-off gas discharged from the first boil-off gas compressor 51, and the boil-off gas bypass second to fourth.
  • the lines BL2 to BL4 may further include first to third flow control valves 842 to 844 for adjusting the flow rates of the boil-off gas discharged from the second to fourth boil-off compressors 52 to 54.
  • Each of the pressure regulating valve 841 and the first to third flow regulating valves 842 to 844 may be controlled by the second control unit 91.
  • the pressure sensor 831 and the flow rate sensor 832 are provided at the rear ends of the first to fourth boil-off gas compressors 51 to 54 on the boil-off gas supply line L1, and the first to fourth boil-off gas compressors 51 to 54.
  • the pressure or flow rate of the boil-off gas discharged at ⁇ 54) may be measured.
  • the pressure sensor 831 and the flow rate sensor 832 are connected to the second control unit 91 in a wired or wireless manner, so that the pressure or flow rate information discharged from the first to fourth evaporative gas compressors 51 to 54 may be obtained. It may transmit to the second control unit 91.
  • the first control unit 90 controls the first to fourth boil-off gas compressors 51 to 54 according to the amount of boil-off gas generated in the liquefied gas storage tank 10, and in detail, the boil-off gas generation amount is a preset generation amount.
  • the boil-off gas generation amount is a preset generation amount.
  • at least one of the first to fourth boil-off gas compressors 51 to 54 is controlled in a standby state.
  • the standby state refers to a state in which the compression of the boil-off gas is not implemented and encompasses both the standby state of operation of the boil-off gas compressor or the shutdown state.
  • the first control unit 90 may receive the evaporation gas generation amount measured from the evaporation gas generation measurement sensor 85 in a wired or wireless manner to control the first to fourth evaporative gas compressors 51 to 54. have.
  • the first control unit 90 operates any one of the first to fourth boil-off gas compressors 51 to 54 when the boil-off gas generation amount received from the boil-off gas generation amount measurement sensor 85 is less than or equal to the preset generation amount. Control to stand by, and to increase the remaining three loads of the first to fourth boil-off gas compressors 51 to 54 connected in parallel.
  • the first control unit 90 controls the first boil-off gas compressor 51 to stand by when the boil-off gas generation amount received from the boil-off gas generation sensor 85 is less than or equal to a preset generation amount, and the second through The load of the fourth boil-off compressors 52 to 54 may be controlled to increase.
  • the first control unit 90 may operate all of the first to fourth boil-off gas compressors 51 to 54 when the amount of boil-off gas received from the boil-off gas generation sensor 85 is greater than the preset generation. Can be controlled.
  • the first control unit 90 closes the amount of the boil-off gas first flow valve 81a and opens the boil-off gas second flow valve 81b to store the liquefied gas storage tank ( 10 to control the boil-off gas supplied from the boil-off gas heat exchanger 20 through the boil-off gas bypass line L7 to be supplied to the first to fourth boil-off gas compressors 51 to 54, and the boil-off gas
  • the boil-off gas first flow valve 81a is opened and the boil-off gas second flow valve 81b is closed so that the boil-off gas supplied from the liquefied gas storage tank 10 exchanges the boil-off gas.
  • the apparatus 20 may be controlled to partially reliquefy the boiled gas compressed in the first to fourth boiled gas compressors 51 to 54.
  • the predetermined generation amount is the amount of boil-off gas flowing into the first-fourth boil-off gas compressors 51 to 54 at the inefficiency point A of the first to fourth boil-off gas compressors 51 to 54.
  • the inefficiency point A is consumed even if the flow rate supplied to the first to fourth boil-off gas compressors 51 to 54 decreases in the ratio of the power consumption to the flow rate of the first to fourth boil-off gas compressors 51 to 54. It may be a flow rate of the first to fourth boil-off gas compressors 51 to 54 at a point where power is not reduced.
  • the flow rate of the inefficiency point A of the first to fourth boil-off gas compressors 51 to 54 may be a flow rate of 20 to 40% of the flow rate at which the first to fourth boil-off gas compressors 51 to 54 have a maximum load. have.
  • Figure 4 is a graph of the power consumption versus the flow rate of the evaporative gas compressor according to an embodiment of the present invention.
  • the power consumption increases proportionally if the flow rate is increased when the flow rate is a section above the inefficient point (A). This means that a lot of power consumption is required to compress a large flow rate of boil-off gas.
  • the inefficiency point (A) is a flow rate value determined according to specifications, driving conditions, etc. of the first to fourth boil-off gas compressors 51 to 54, and the first to fourth boil-off gas compressors 51 to 54 have a maximum load. 20 to 40% of the flow rate having a flow rate.
  • the power consumption does not decrease even if the flow rate is reduced. This is because of the power consumption consumed to prevent surging that occurs when a constant volume of boil-off gas does not flow into the first to fourth boil-off compressors 51 to 54.
  • a part of the boil-off gas flowing into the first to fourth boil-off gas compressors 51 to 54 is recycled so that the volume of the boil-off gas into the first to fourth boil-off gas compressors 51 to 54 is equal to or greater than a predetermined value.
  • separate power consumption is generated in the first to fourth boil-off gas compressors 51 to 54 in order to perform the recycling, which is introduced into the first to fourth boil-off gas compressors 51 to 54 due to the power consumption. Even if the amount of boil-off gas is reduced, power consumption is not reduced.
  • the first to fourth boil-off gas compressors 51 to 54 when the first to fourth boil-off gas compressors 51 to 54 are driven in parallel, the first to fourth boil-off gas compressors 51 to 54 disclosed in FIG. 4 are characterized. By using the power consumption can be minimized to the first to fourth boil-off compressors 51 to 54.
  • the flow rate at the point of inefficiency (A) is 50
  • the power consumption at that time is also 50
  • the ratio (tilt) of the flow rate and power consumption is 1 at a section above A (based on one evaporative gas compressor).
  • the flow rate of the boil-off gas flowing into the first to fourth boil-off gas compressors 51 to 54 is 30 each (when the amount of boil-off gas generated in the liquefied gas storage tank 10 is less than or equal to the preset generation amount) 2) the power consumption when the first to fourth boil-off compressors 51 to 54 are driven, and 2) the first to fourth boil-off compressors 51 to 54 are standby. Let's compare.
  • the first to fourth boil-off gas compressors 51 to 54 when the first to fourth boil-off gas compressors 51 to 54 are driven in parallel, the first to fourth boil-off gas compressors 51 when the amount of boil-off gas is less than or equal to a preset generation amount.
  • the first to fourth boil-off gas compressors 51 when the amount of boil-off gas is less than or equal to a preset generation amount.
  • the first control unit 90 may alternately control at least one of the plurality of boil-off gas compressors 51 to 54 in a standby state when the boil-off gas generation amount is repeatedly generated at or below a preset generation amount.
  • the first control unit 90 controls the at least one of the first to fourth boil-off gas compressors 51 to 54 in a standby state when the boil-off gas generation amount is less than or equal to the preset generation amount.
  • the other one of the first to fourth boil-off gas compressors 51 to 54 may be controlled in a standby state.
  • the first control unit 90 controls the first evaporated gas compressor 51 to be in a standby state, and the second to fourth evaporated gas compressors 52 to 54 are operated. Control to keep.
  • the first controller 90 releases the standby state of the first boil-off gas compressor 51 and starts it again, thereby operating the first to fourth boil-off gas compressors 51 to 4. 54) are all operated.
  • the second boil-off gas compressor 52 is controlled to be in a stopped state rather than the first boil-off gas compressor 51, and the first, third, and fourth The boil-off gas compressors 51, 53, 54 are controlled to maintain an operating state.
  • the durability of the first to fourth boil-off gas compressors 51 to 54 can be improved.
  • the first control unit 90 controls at least one of the first to fourth boil-off gas compressors 51 to 54 to an operation stop state, and controls the boil-off boiled gas compressor to an operation standby state under a predetermined condition. do.
  • the first control unit 90 when the operation standby state of the boil-off gas compressor (for example, the first boil-off gas compressor 51) waited for operation exceeds a predetermined period, the boil-off boil-off compressor 51 is operated.
  • the boil-off gas compressor 51 which is controlled to stop or restarts the boil-off gas compressor 51 and started to operate through the boil-off gas compressor bypass line (for example, the boil-off gas compressor bypass first line BL1).
  • the discharged boil-off gas may be controlled to bypass the start-up of the boil-off gas compressor 51.
  • each of the boil-off gas compressor bypass lines BL1 to Bl4 is provided with control valves (not shown).
  • the first control unit 90 may perform the bypass control through a control valve.
  • the preset condition may be a condition that reaches the previous time by the time it takes to restart the deactivated boil-off gas compressor 51 at the point when the deactivated boil-off gas compressor 51 is restarted.
  • the time point for the boil-off gas compressor 51 to be restarted is a time when the internal pressure of the liquefied gas storage tank 10 exceeds a preset pressure or when the amount of boil-off gas generated in the liquefied gas storage tank 10 exceeds a preset amount. Can be.
  • the first to fourth boil-off gas compressors 51 to 54 can quickly return to the operating state from the standby state, thereby improving the reliability of the boil-off gas supply. Stability is maximized.
  • the second control unit 91 is the pressure of the boil-off gas discharged from the first to fourth boil-off gas compressors 51 to 54 according to the pressure or the flow rate of the boil-off gas required by the first and second demand destinations 71 and 72. Or control the flow rate.
  • the second control unit 91 compares the pressure or flow rate of the boil-off gas required by the first demand destination 71 with the pressure or flow rate measured by the pressure sensor 831 and the flow rate sensor 832, respectively. Control controls only the pressure of the boil-off gas discharged for only one boil-off gas compressor among the first to fourth boil-off compressors 51 to 54, and the control of the flow rate is the first to the fourth boil-off compressor 51. Only the flow rate of the boil-off gas discharged to the boil-off gas compressor other than the boil-off gas compressor of ⁇ 54) may be controlled.
  • the second control unit 91 closes the pressure regulating valve 841, and the first control unit 91 closes the first control unit.
  • the pressure regulating valve 842 is opened.
  • the second control unit 91 may operate the first to third flow control valves 842 to 844. Closes and controls to increase the load of the second to fourth boil-off compressors 52 to 54, and the flow rate of the boil-off gas required by the first demand destination 71 is less than the flow rate measured by the flow sensor 832.
  • the first to third flow control valves 842 to 844 are opened, and the second to fourth evaporative gas compressors 52 to 54 are provided through the second and fourth lines BL2 to BL4 of the boil-off gas compressor bypass. At least a part of the discharged boil-off gas may be controlled to be supplied to the front end of the second to fourth boil-off compressors 52 to 54.
  • the pressure or flow rate required by the first demand destination 71 is appropriate. It can be controlled so that the reliability of the boil-off gas supply is improved and the stability is maximized.
  • FIG. 2 is a conceptual diagram of a gas treatment system according to another embodiment of the present invention.
  • the gas treatment system 2 includes a liquefied gas storage tank 10, a boil-off gas heat exchanger 20, a boil-off gas pressure reducer 30, and a gas-liquid separator. 40, first to fourth evaporative gas compressors 51 to 54, a heater 61, a first demand destination 71, a second demand destination 72, and a third control unit 92.
  • the heater 61 is provided on the boil-off gas bypass line L7 and bypasses the boil-off gas heat exchanger 20 to heat the boil-off gas supplied to the first to fourth boil-off gas compressors 51 to 54. do.
  • the heater 61 may be supplied with steam supplied from the boiler 72 as a heat source, and the evaporation gas of about minus 110 degrees may be lowered by heat exchange between the steam and the evaporated gas generated in the liquefied gas storage tank 10.
  • the temperature can be raised from 40 degrees to minus 20 degrees.
  • a boil-off gas temperature measuring sensor (86).
  • the boil-off gas temperature measuring sensor 86 may be provided downstream of the boil-off gas heat exchanger 20 on the boil-off gas supply line L1 and upstream of the first to fourth boil-off gas compressors 51 to 54. The temperature of the boil-off gas flowing into the first to fourth boil-off compressors 51 to 54 may be measured and transmitted to the third controller 92.
  • the boil-off gas temperature measuring sensor 86 may be connected to the third control unit 92 by wire or wirelessly.
  • the third control unit 92 controls the flow rate of the boil-off gas supplied to the boil-off gas heat exchanger 20 and the heater 61 in accordance with the amount of boil-off gas generated in the liquefied gas storage tank 10.
  • the third controller 92 controls the boil-off gas supplied from the liquefied gas storage tank 10 to be supplied only to the heater 61, and the amount of generated boil-off gas
  • the first preset generation amount is less than the second preset generation amount, it is controlled to supply the boil-off gas supplied from the liquefied gas storage tank 10 to both the boil-off gas heat exchanger 20 and the heater 61, and the amount of boil-off gas generated
  • the evaporated gas supplied from the liquefied gas storage tank 10 may be controlled to be supplied only to the evaporated gas heat exchanger 20.
  • the first preset generation amount is an amount smaller than the second preset generation amount.
  • FIG. 5 is a graph of the amount of boil-off gas generated in the liquefied gas storage tank compared to the operating time of the ship according to an embodiment of the present invention.
  • the amount of boil-off gas generated in the liquefied gas storage tank 10 changes depending on the operating time of the vessel 1.
  • the amount of boil-off gas generated in the liquefied gas storage tank 10 is continuously increased at a constant rate in the amount of the boil-off gas generated in the operation initial section B1 and the operation elementary and medium-sized section B2. Thereafter, in the operating medium section B3, the amount of boil-off gas is initially increased at a constant rate, then the amount of stagnation is stagnated at a certain flow rate in the middle, and the amount of boil-off gas is reduced at a constant rate in the second half. Finally, the amount of boil-off gas continuously decreases at a constant rate in the operation end device B2 and the operation end device B1.
  • the operation initial section B1 and the operation end section B1 are sections which are less than or equal to the first predetermined generation amount X
  • the operation elementary and intermediate sections B2 and the operation terminal section B2 are the first predetermined generation amounts X.
  • the heavy machinery section B3 refers to a section that is greater than or equal to the second preset generation amount (Y).
  • the first to fourth through the third control unit 92 The preheating drive control of the boil-off gas flowing into the boil-off gas compressors 51 to 54 is optimized.
  • the third control unit 92 when the amount of boil-off gas generated in the liquefied gas storage tank 10 is less than or equal to the first predetermined amount (X) (B1 section), the third flow rate of the boil-off gas first flow valve 81a The opening degree is closed and the opening degree of the second boil-off gas flow rate valve 81b is opened, so that the boil-off gas supplied from the liquefied gas storage tank 10 can be controlled to be supplied only to the heater 61.
  • the third control unit 92 when the amount of boil-off gas generated in the liquefied gas storage tank 10 is less than the first preset amount (X) and less than the second preset amount (Y) (section B2), the boil-off gas Opening the openings of the first and second flow rate valves 81a and 81b to control the evaporated gas supplied from the liquefied gas storage tank 10 to be supplied to the boil-off gas heat exchanger 20 and the heater 61, but the evaporation According to the temperature measured by the gas temperature measuring sensor 86, the opening ratio between the boil-off gas first and second flow valves 81a and 81b can be controlled.
  • the third control unit 92 opens the opening degree of the boil-off gas first flow valve 81a when the boil-off gas generated in the liquefied gas storage tank 10 is equal to or greater than the second preset generation amount Y (section B3). Then, the opening degree of the second boil-off gas flow rate valve 81b may be closed to control the boil-off gas supplied from the liquefied gas storage tank 10 to be supplied only to the boil-off gas heat exchanger 20.
  • the preheating operation of the boil-off gas flowing into the first to fourth boil-off gas compressors 51 to 54 is controlled according to the operating time of the ship 1, so that the boil-off gas heat exchanger 20
  • the malfunction of the first to fourth boil-off gas compressors 51 to 54, which may occur when only one is present, may be prevented, thereby improving the reliability of the system.
  • FIG. 3 is a conceptual diagram of a gas treatment system according to another embodiment of the present invention.
  • the gas treatment system 2 includes a liquefied gas storage tank 10, an evaporated gas heat exchanger 20, an evaporated gas pressure reducer 30, and a gas liquid.
  • Separator 40 first to fourth boil-off gas compressors 51 to 54, heaters 61, forced vaporizers 62, pumps 63, first demand destination 71, second demand destination 72, first 4, the control unit 93 is included.
  • it may further include a forced evaporation gas supply line (L8).
  • the forced evaporation gas supply line L8 connects the liquefied gas storage tank 10 and the downstream of the boil-off gas heat exchanger 20 on the boil-off gas supply line L1 and may include a forced vaporizer 62.
  • the forced evaporation gas supply line L8 may be provided with an additional boil-off gas supply valve 82, and a supply amount of the liquefied gas supplied to the forced vaporizer 62 according to the opening degree of the additional boil-off gas supply valve 82. Can be controlled.
  • the additional boil-off gas supply valve 82 may be connected to the fourth control unit 93 in a wired or wireless manner to receive an opening degree adjustment command of the fourth control unit 93.
  • the forced vaporizer 62 is provided on the forced evaporation gas supply line L8.
  • the forced vaporizer 62 receives the liquefied gas stored in the liquefied gas storage tank 10 from the pump 63 and forcibly vaporizes the first to fourth boil-off gas compressors. Supply to (51 ⁇ 54).
  • the forced vaporizer 62 may receive steam supplied from the boiler 72 as a heat source, and heat the liquefied liquefied gas by vapor-exchanging the vaporized gas generated in the liquefied gas storage tank 10. It can be changed into forced vaporization gas.
  • the liquid liquefied gas can be raised to a forced vaporized evaporation gas having a temperature of about 163 degrees below zero, and a temperature of about 40 degrees below zero to about 20 degrees below zero, which is a phase change from the liquid phase to the gas phase as described above.
  • the forced vaporizer 62 can share steam with the heater 61.
  • the boiler 72 may supply steam not only to the forced vaporizer 62 but also to the heater 61.
  • the forced vaporizer 62 may be driven together with the heater 61.
  • the reason why the heater 61 is driven in the embodiment of the present invention is that the preheating function of the boil-off gas heat exchanger 20 is weakened and must be replenished. That is, in this case, the amount of generated boil-off gas generated in the liquefied gas storage tank 10 is reduced, so that the amount of boil-off gas to be supplied to the first to fourth boil-off gas compressors 51 to 54 is small. Lose.
  • the amount of boil-off gas to be supplied to the first to fourth boil-off gas compressor (51 to 54) can be replenished.
  • driving reliability of the first to fourth boil-off gas compressors 51 to 54 may be improved.
  • the forced vaporizer 62 and the heater 61 uses steam as a heat exchange medium, and by sharing this steam with each other, it is possible to share the location where the equipment is installed. Details thereof will be described later.
  • the pump 63 may be provided on the forced evaporation gas supply line L8 to supply the liquefied gas stored in the liquefied gas storage tank 10 to the forced vaporizer 62.
  • the pump 63 is connected to the fourth control unit 93 in a wired or wireless manner to receive a pump operation signal or a pump operation stop signal, and is operated by the pump operation signal of the fourth control unit 93 to liquefy gas.
  • the liquefied gas stored in the storage tank 10 may be supplied to the forced vaporizer 62 or stopped by the pump operation stop signal to stop the supply of the liquefied gas supplied to the forced vaporizer 62.
  • the pump 63 may be provided inside or outside the liquefied gas storage tank 10, and may be, for example, a centrifugal pump.
  • the fourth controller 93 supplies the flow rate of the boil-off gas supplied to the boil-off gas heat exchanger 20 and the heater 61 and the forced vaporizer 62 according to the amount of boil-off gas generated in the liquefied gas storage tank 10.
  • the flow rate of the liquefied gas to be controlled can be controlled.
  • the fourth control unit 93 controls the heater 61 and the forced vaporizer 62 to be driven together when the amount of generated evaporation gas is less than or equal to the first predetermined amount generated, but not to operate the evaporated gas heat exchanger 20.
  • the heater 61 and the forced vaporizer 62 are driven together, and the boil-off gas heat exchanger 20 is also controlled to operate together.
  • the amount of generation is greater than or equal to the second preset amount, it may be controlled to operate only the boil-off gas heat exchanger 20.
  • the fourth control unit 93 closes the opening degree of the boil-off gas first flow valve 81a when the boil-off gas generation amount is equal to or less than the first predetermined generation amount X (section B1), and the boil-off gas second flow valve 81b. While opening the opening of the liquefied gas storage tank 10 to control the evaporation gas supplied to the heater 61 only, while opening the opening of the additional boil-off gas supply valve 82 and operating the pump 63 liquefied gas The liquefied gas stored in the storage tank 10 may be controlled to be supplied to the forced vaporizer 62.
  • the fourth control unit 93 when the amount of boil-off gas generated is greater than the first preset amount (X) and less than the second preset amount (Y) (section B2), the first boil-off gas first flow valve 81a and the second boil-off gas While opening all the openings of the flow valve 81b to control the evaporated gas supplied from the liquefied gas storage tank 10 to be supplied to both the boil-off gas heat exchanger 20 and the heater 61, the additional boil-off gas supply valve 82 By opening the opening degree and operating the pump 63 can be controlled so that the liquefied gas stored in the liquefied gas storage tank 10 is also supplied to the forced vaporizer (62).
  • the fourth control unit 93 opens the first and second flow rate valves 81a and 81b and the additional supply valve 82 of the evaporation gas according to the temperature measured by the evaporation gas temperature measuring sensor 86.
  • the temperature of the boil-off gas supplied to the first to fourth boil-off compressors 51 to 54 may be controlled.
  • the fourth control unit 93 opens the opening degree of the boil-off gas first flow valve 81a when the boil-off gas generation amount is equal to or greater than the second preset generation amount Y (section B3), and the boil-off gas second flow valve 81b.
  • the opening of the liquefied gas storage tank 10 so that the evaporated gas supplied only to the boil-off gas heat exchanger 20, the opening of the additional boil-off gas supply valve 82 is closed and the pump 63 is operated.
  • By stopping the liquefied gas stored in the liquefied gas storage tank 10 can be controlled so as not to be supplied to the forced vaporizer (62).
  • the preliminary driving of the boil-off gas flowing into the first to fourth boil-off gas compressors 51 to 54 is controlled according to the operating time of the ship 1, and the forced vaporizer 62 is controlled.
  • the flow rate of the boil-off gas flowing into the first to fourth boil-off gas compressors 51 to 54 can be adequately satisfied at all times, thereby maximizing driving efficiency of the first to fourth boil-off gas compressors 51 to 54.
  • the reliability of the system is improved.
  • Figure 6 is a side view of a ship having a gas treatment system according to an embodiment of the present invention
  • Figure 7 is an internal plan view of a cargo compressor room of the ship according to an embodiment of the present invention
  • Figure 8 is another embodiment of the present invention
  • 9 is an internal cross-sectional view of a cargo compressor room of a ship according to another embodiment of the present invention
  • FIG. 10 is a cargo compressor room of a ship according to another embodiment of the present invention. It is a modified internal cross section.
  • the ship 1 having the gas treatment system 2 includes a cargo compressor room 100, a skid 101, and a motor room 200. , An engine casing 300, a liquefied gas storage tank 10, first to fourth boil-off compressors 51 to 54, a first demand destination 71, and a second demand destination 72.
  • the first to fourth boil-off gas compressors 51 to 54 may be classified into a driving boil-off gas compressor and a power-saving boil-off gas compressor, which is one embodiment of the present invention described with reference to FIGS. 1 to 3.
  • the boil-off gas compressor serving as an operating atmosphere may be a power-saving boil-off gas compressor
  • the boil-off gas compressor that is always operating without waiting for operation may be a boil-off gas compressor.
  • the driving boil-off gas compressor may be the first to third boil-off gas compressors 51 to 53
  • the power-saving boil-off gas compressor may be the fourth boil-off gas compressor 54.
  • the first to fourth boil-off gas compressors 51 to 54 are used in the gas treatment system 2 according to the embodiment of the present invention described with reference to FIGS. 1 to 3.
  • the alternating control described is not performed.
  • the vessel 1 can accommodate the liquefied gas storage tank 10 and the first and second demand destinations 71 and 72 in the hull H under the upper deck (not shown), and on the upper deck.
  • the compressor room 100, the motor room 200, and the engine casing 300 may be provided.
  • the vessel 1 may be provided with only a plurality of liquefied gas storage tank 10 in the hull (H) in accordance with the transport purpose, that is, in the case of the LNG carrier, the cargo compressor room 100, the motor room (on the upper deck) 200 and the engine casing 300, in the case of a container carrier ship, the liquefied gas storage tank 10, the cargo compressor room 100, the motor room 200 and the container holding hold in the hull (H)
  • a plurality may be provided together, and the engine casing 300 and the containers may be provided on the upper deck.
  • the cargo compressor room 100 is a separate isolated space provided on the upper deck of the hull H, for example, may be provided in front of the motor room 200.
  • the cargo compressor room 100 accommodates the 1st-4th boil-off gas compressor 51-54 inside in the structure arrange
  • the cargo compressor room 100 is bound to be limited in the interior receiving space.
  • the first to fourth boil-off gas compressors 51 to 54 have a problem of utilizing space inside the cargo compressor room 100 as the compression capacity and size are gradually increased.
  • the height of the first to fourth boil-off gas compressors 51 to 54 is half the height of the cargo compressor room 100, that is, the existing boil-off gas having a size of preferably within 2 to 4 m. It is composed of an evaporative gas compressor having the same performance as the compressors. That is, the first to fourth boil-off gas compressors 51 to 54 may be standard high pressure compressors, and the pistons of the first to fourth boil-off gas compressors 51 to 54 may be one example. It can be configured by intersecting in a V-shape to connect a plurality of series.
  • the first to fourth boil-off gas compressors 51 to 54 are constructed by connecting a plurality of pistons in series in a V-shape and connected in series so that they can have a size of 2 to 4 m or less in height, and thus the cargo compressor room 100 It is now possible to implement optimal deployment within.
  • the first and second boil-off gas compressors 51 and 52 are on the upper side, and the third and fourth boil-off gas compressors 53 and 54 on the lower side. It can be arranged in the cargo compressor room 100 in a two-layer structure provided to be stacked on each other, so that the space in the cargo compressor room 100 occupied by the first and second boil-off gas compressor (51, 52) Can be further secured.
  • the cargo compressor room 100 has a boil-off gas heat exchanger 20, a boil-off gas reducer 30, and a gas-liquid separator 40 in addition to the first to fourth boil-off gas compressors 51 to 54 in the additionally secured space.
  • the heater 61, the forced vaporizer 62, and the like can accommodate a device for processing a liquefied gas or evaporated gas, it can also accommodate a skid 101 to be described later.
  • the heater 61 may be disposed above the first to fourth boil-off gas compressors 51 to 54 when the first to fourth boil-off gas compressors 51 to 54 are arranged in the same layer rather than the stacked structure. Can be.
  • the skid 101 is a flat support plate provided to support the first to fourth boil-off gas compressors 51 to 54 from the upper deck and is provided in the cargo compressor room 100.
  • the skid can be used interchangeably with the support plate and has the same meaning.
  • the skid 101 is configured to support a driving boil-off gas compressor (eg, first to third boil-off gas compressors 51 to 53) which are not standby among the first to fourth boil-off gas compressors 51 to 54 from the upper deck.
  • a driving boil-off gas compressor eg, first to third boil-off gas compressors 51 to 53
  • the second support plate 101b for supporting the power saving evaporative gas compressor (for example, the fourth evaporative gas compressor) 54 which is standby among the first support plate 101a and the first to fourth evaporative gas compressors 51 to 54 is provided. It may include.
  • first support plate 101a and the second support plate 101b may be spaced apart from each other from side to side as shown in FIGS. 7 and 8 to form a vibration blocking gap 102.
  • the vibration blocking gap 102 includes first to third boil-off gas compressors 51 to 53 when the first to fourth boil-off gas compressors 51 to 54 are arranged in a 4 * 1 matrix.
  • the fourth boil-off gas compressor 54 is standby by falling below the set generation amount, vibration generated by the operation from the first to third boil-off gas compressors 51 to 53 may be blocked.
  • the standby evaporative gas compressor 54 may be protected from vibration, thereby improving durability.
  • the vibration blocking gap 102 is the first to third boil-off gas compressor 51 when the first to fourth boil-off gas compressors 51 to 54 are arranged in a 2 * 2 matrix as shown in FIG. 8.
  • ⁇ 53 is provided between the first support plate 101a and the second support plate 101b for supporting the fourth boil-off gas compressor 54 to form a liquefied gas in the liquefied gas storage tank 10.
  • the vibration blocking gap 102 may include a member for damping vibration, and may be, for example, air or a damper provided separately.
  • the skid 101 includes an upper skid 101u and a third and fourth boil-off gas compressors 53 and 54 which support the first and second boil-off gas compressors 51 and 52 at a predetermined interval from the upper deck. ) May include a lower skid 101l supporting the upper deck.
  • the upper skid 101u and the lower skid 101l may be disposed to be spaced apart from each other up and down as shown in FIGS. 9 and 10, and the upper skid 101u is upper side from the upper deck by the spacer 103. It can be spaced apart by a certain interval.
  • the heater 61 may be provided in the upper skid 101u together with the first boil-off gas compressor 51, in which case the second boil-off gas compressor 52 is the third and fourth boil-off gas compressors 53. And 54 may be provided on the lower skid 101l.
  • the spacer member 103 allows the upper skid 101u to be spaced apart from the upper deck by a predetermined interval, and connects the upper deck and the upper skid 101u, or connects the lower skid 101l and the upper skid 101u.
  • the lower skid 101l is disposed on the upper deck portion perpendicular to the position of the spacer 103 connected to the upper skid 101u. ) May be arranged not to be provided so as to be vertically connected to the spacer 103 and the upper deck.
  • the spacer 103 when the spacer 103 connects the lower skid 101l and the upper skid 101u, the spacer 103 is formed when the upper skid 101u and the lower skid 101l have the same area and shape. It can be connected in the form of upper deck and oblique line.
  • the spacer 103 may include a vibration damping unit (not shown).
  • the vibration damping unit may be a hydraulic damping device or an elastic body formed of a material having an elastic force.
  • the motor room 200 may accommodate a motor (not shown) for driving the first to fourth boil-off gas compressors 51 to 54 and the like in a separate isolated space provided on the upper deck of the hull H. It is provided adjacent to the cargo compressor room (100). For example, the motor room 200 may be disposed at the rear of the cargo compressor room 100.
  • the motor room 200 should be isolated from the cargo compressor room 100 which is a hazard zone as a safety zone. For this reason, in the embodiment of the present invention, an isolation wall (not shown) is installed between the cargo compressor room 100 and the motor room 200 so that sparks or the like caused by the operation of the motor are not generated in the cargo compressor room 100. By doing so, the stability of the ship 1 is ensured.
  • the engine casing 300 is provided on the upper deck of the hull H, and at least a part of the engine room (not shown) provided with the first demand destination 71 and the second demand destination 72 and a stack (symbol illustrated). And ventmasts (not shown).
  • the engine casing 300 discharges the exhaust gas discharged from the first demand destination 71 and the second demand destination 72 through the stack and vents the air discharged from the hull H or from the cabin (not shown). Can be discharged to the outside.
  • the gas treatment system 2 is arranged to optimize the space inside the hull H, so that the utilization of the space inside the hull H is improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Selon un mode de réalisation de la présente invention, un système de traitement de gaz comprend : une pluralité de compresseurs de gaz d'évaporation qui mettent sous pression un gaz d'évaporation généré dans un réservoir de stockage de gaz liquéfié, de façon à fournir le gaz d'évaporation sous pression à une source de demande, et qui sont construits en parallèle les uns avec les autres; une unité de commande pour commander les compresseurs de gaz d'évaporation selon une quantité de génération du gaz d'évaporation généré dans le réservoir de stockage de gaz liquéfié, l'unité de commande commandant au moins un des compresseurs de gaz d'évaporation dans un état d'attente dans lequel la compression du gaz d'évaporation n'est pas mise en œuvre, selon la quantité de génération du gaz d'évaporation.
PCT/KR2017/005643 2016-06-03 2017-05-30 Système de traitement de gaz et navire le comprenant WO2017209492A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20160069736 2016-06-03
KR10-2016-0069736 2016-06-03
KR10-2016-0179559 2016-12-26
KR1020160179559A KR101913015B1 (ko) 2016-06-03 2016-12-26 가스 처리 시스템 및 이를 포함하는 선박

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WO2017209492A1 true WO2017209492A1 (fr) 2017-12-07

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US20210071815A1 (en) * 2018-01-08 2021-03-11 Cryostar Sas Method for providing pressurized gas to consumers and corresponding compressor arrangement at variable suction conditions
CN113653629A (zh) * 2021-01-06 2021-11-16 株式会社神户制钢所 压缩机组以及压缩机组控制用程序

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US11703187B2 (en) * 2018-01-08 2023-07-18 Cryostar Sas Method for providing pressurized gas to consumers and corresponding compressor arrangement at variable suction conditions
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