WO2023100231A1 - Installation de réception de gaz liquéfié et son procédé de commande - Google Patents

Installation de réception de gaz liquéfié et son procédé de commande Download PDF

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Publication number
WO2023100231A1
WO2023100231A1 PCT/JP2021/043817 JP2021043817W WO2023100231A1 WO 2023100231 A1 WO2023100231 A1 WO 2023100231A1 JP 2021043817 W JP2021043817 W JP 2021043817W WO 2023100231 A1 WO2023100231 A1 WO 2023100231A1
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WO
WIPO (PCT)
Prior art keywords
liquefied gas
pump
delivery
line
flow rate
Prior art date
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PCT/JP2021/043817
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English (en)
Japanese (ja)
Inventor
修 安達
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日揮グローバル株式会社
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Publication date
Application filed by 日揮グローバル株式会社 filed Critical 日揮グローバル株式会社
Priority to PCT/JP2021/043817 priority Critical patent/WO2023100231A1/fr
Priority to JP2022544270A priority patent/JP7155460B1/ja
Publication of WO2023100231A1 publication Critical patent/WO2023100231A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/03—Stopping, starting, unloading or idling control by means of valves
    • F04B49/035—Bypassing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the present invention relates to a liquefied gas receiving facility that receives liquefied gas, stores it in a liquefied gas tank, and delivers the liquefied gas from a delivery line, and a control method thereof.
  • Liquefied natural gas Liquefied Natural Gas
  • LPG Liquefied Petroleum Gas
  • other liquefied gases are used in the liquid state for storage and transportation because their volume is smaller than that in the gaseous state.
  • a minimum flow is set in order to prevent overheating, vibration, etc. due to an insufficient flow rate.
  • Patent Literature 1 describes branching a minimum flow line from a liquefied gas supply line using a high-pressure pump unit to enable continuous operation of the high-pressure pump unit.
  • Patent Document 2 describes estimating the primary side pressure from the measured value of the secondary side flow rate and the secondary side pressure in an unbalanced pressure reducing valve used in a gas supply system.
  • multiple pumps may be installed in the storage tank in order to increase the transport capacity of the pump or as a backup against pump failure. If a minimum flow line is provided for each pump, it will be necessary to install facilities and equipment attached to the minimum flow line for each pump.
  • An object of the present invention is to provide a liquefied gas receiving facility and a control method thereof that can simplify the minimum flow line facility and reduce costs.
  • a first aspect of the present invention includes a liquefied gas tank for storing liquefied gas, a delivery line for delivering the liquefied gas from the liquefied gas tank in a liquid state, and a delivery pump for delivering the liquefied gas from the liquefied gas tank to the delivery line. and a minimum flow line branching from the payout line and capable of returning the liquefied gas to the liquefied gas tank;
  • the pump suction pressure of the delivery pump below the liquid level of the liquefied gas is calculated from the density and liquid level of the stored liquefied gas and the gas phase pressure above the liquid level of the liquefied gas in the liquefied gas tank.
  • the liquefied gas receiving facility is characterized in that the minimum flow of the delivery pump is controlled using the pump suction pressure and the pump performance curve of the delivery pump.
  • the control system includes, in the pump performance curve, a pressure converted to a head corresponding to a minimum flow rate required to maintain the delivery pump, and the pump suction pressure Estimate the pump discharge pressure at the minimum flow rate, compare the estimated value of the pump discharge pressure with the measured value of the pump discharge pressure measured in the payout line, and compare the measured value of the pump discharge pressure with the measured value of the pump discharge pressure
  • the flow rate of the minimum flow line is increased, and when the measured value of the pump discharge pressure is lower than the estimated value of the pump discharge pressure, the flow rate of the minimum flow line is decreased.
  • the control system uses the actual value of the pump discharge pressure measured in the payout line, the pump suction pressure, and the pump performance curve to determine the determining an estimated flow rate in a payout line, and if the estimated flow rate is less than the minimum flow rate required to maintain the delivery pump, increasing the flow rate in the minimum flow line, wherein the estimated flow rate is less than the estimated flow rate required to maintain the delivery pump; is more than the minimum flow rate, the flow rate of the minimum flow line is reduced.
  • the liquefied gas receiving equipment includes two or more delivery pumps and the two or more delivery pumps for the same liquefied gas tank. and a payout line shared with the same liquefied gas tank, wherein the minimum flow line includes a miniflow valve disposed therein, and the control system, when activating any of the two or more delivery pumps, actuates the other in the same liquefied gas tank.
  • the control system when activating any of the two or more delivery pumps, actuates the other in the same liquefied gas tank.
  • the liquefied gas is allowed to flow through the mini-flow valve to the minimum flow line for a predetermined time after the first delivery pump is activated.
  • a pressure indicator controller for the liquefied gas is arranged in the delivery line, and the control system controls the pressure value of the pressure indicator controller and the mini
  • the flow rate in the miniflow valve is calculated from the capacity coefficient of the flow valve, and it is determined whether or not the minimum flow is maintained.
  • control system increases the flow rate in the miniflow valve when the calculated value of the flow rate in the miniflow valve is insufficient to maintain the minimum flow.
  • control system when activating any one of the two or more delivery pumps, controls other delivery pumps in the same liquefied gas tank.
  • the total flow rate downstream of the payout line is calculated, and this total value is used to maintain minimum flow for the newly started and running pumps. It is characterized by determining whether it is sufficient or not.
  • control system when activating any one of the two or more delivery pumps, controls other delivery pumps in the same liquefied gas tank.
  • the liquefied gas is allowed to flow through the mini-flow valve to the minimum flow line for a predetermined time after the start of the newly started delivery pump.
  • a ninth aspect of the present invention is a liquefied gas tank for storing liquefied gas, a delivery line for delivering the liquefied gas from the liquefied gas tank in a liquid state, and a delivery pump for delivering the liquefied gas from the liquefied gas tank to the delivery line. and a minimum flow line branching from the delivery line and capable of returning the liquefied gas to the liquefied gas tank, wherein the liquefied gas stored in the liquefied gas tank.
  • a control method for a liquefied gas receiving facility characterized in that the minimum flow of the delivery pump is controlled using the pressure and the pump performance curve of the delivery pump.
  • the first aspect it is possible to control the minimum flow of the delivery pump without installing a flow meter in the dispensing line or attaching a flow meter to each pump. Therefore, the equipment of the minimum flow line can be simplified and the cost can be reduced. In addition, operating costs can be reduced by setting the optimum minimum flow value according to fluctuations in the liquid level and liquid density caused by receiving and discharging liquefied gas.
  • control is optimized to control the minimum flow by comparing the measured value of the pump discharge pressure in the payout line with the estimated value of the pump discharge pressure.
  • control is optimized to control the minimum flow by comparing the minimum flow required to maintain the delivery pump to the estimated flow in the payout line.
  • the minimum flow is ensured on the assumption that the flow rate is low for a predetermined period of time after the first start-up of the delivery pump, which facilitates control.
  • the flow rate in the minimum flow line can be increased or decreased depending on the situation to control the flow rate more than necessary, and the operating cost can be reduced.
  • the minimum flow can be maintained more reliably by calculating the flow rate in the miniflow valve.
  • the minimum flow can be more reliably maintained by increasing the flow rate based on the calculated value of the flow rate in the miniflow valve.
  • the flow rates of the delivery pumps in operation are the minimum flow of the delivery pumps in operation and the minimum flow of the delivery pumps to be activated after the second delivery pump.
  • the eighth aspect even when the second and subsequent delivery pumps are started, the minimum flow is ensured on the assumption that the flow rate is low for a predetermined time after the delivery pump is started, so control becomes easy. . After a predetermined time has passed since the startup, the flow rate in the minimum flow line can be increased or decreased depending on the situation to control the flow rate more than necessary, and the operating cost can be reduced.
  • the ninth aspect it is possible to control the minimum flow of the delivery pump without installing a flow meter in the dispensing line or attaching a flow meter to each pump. Therefore, the equipment of the minimum flow line can be simplified and the cost can be reduced. In addition, operating costs can be reduced by setting the optimum minimum flow value according to fluctuations in the liquid level and liquid density caused by receiving and discharging liquefied gas.
  • FIG. 1 is a schematic diagram showing a first embodiment of a liquefied gas receiving facility
  • FIG. 4 is a schematic diagram showing a second embodiment of a liquefied gas receiving facility
  • It is an explanatory view showing an example of a pump performance curve.
  • FIGS. 1 and 2 An embodiment of a liquefied gas receiving facility 100 is shown in FIGS. These embodiments are provided with the same configuration except for the illustration of the downstream side where the liquefied gas 11 is paid out. Therefore, the configuration common to FIGS. 1 and 2 may be described without distinguishing between the embodiments.
  • the liquefied gas receiving facility 100 includes a liquefied gas tank 10 that stores the liquefied gas 11, a delivery pump 12 that delivers the liquefied gas 11, a delivery line 20 for the liquefied gas 11, a minimum flow line 23, and a control system 30. Prepare.
  • the liquefied gas 11 is a fluid obtained by liquefying a substance that is gas at normal temperature and normal pressure by compression, cooling, or the like.
  • a substance that can be the liquefied gas 11 is not particularly limited, but may be an organic substance or an inorganic substance, and may be a single substance or a mixture. Specific examples include natural gas, petroleum gas, synthetic gas, low-grade (about C1 to C4) hydrocarbons, hydrogen (H 2 ), ammonia (NH 3 ), oxygen (O 2 ), nitrogen (N 2 ), and air. etc.
  • the liquefied gas tank 10 is a container that stores the liquefied gas 11.
  • the liquefied gas tank 10 may be an above-ground type, an underground type, or a semi-underground type.
  • the liquefied gas 11 in the liquefied gas tank 10 may include a gas phase portion 11a on the top portion 10a side of the liquefied gas tank 10 .
  • the liquefied gas tank 10 is provided with a receiving line for receiving the liquefied gas 11 from a tanker or the like.
  • the delivery pump 12 is installed from the top 10a of the liquefied gas tank 10 toward the bottom 10b.
  • a discharge portion 12 a of the delivery pump 12 is installed on the top portion 10 a of the liquefied gas tank 10 .
  • a suction portion 12 b of the delivery pump 12 is immersed under the liquid surface 11 b of the liquefied gas 11 .
  • the delivery line 20 is a path connected to the discharge part 12a of the delivery pump 12 and delivering the liquefied gas 11 from the liquefied gas tank 10 in a liquid state.
  • the liquefied gas 11 can be delivered from the liquefied gas tank 10 to the delivery line 20 .
  • the minimum flow line 23 is a path that branches off from the payout line 20 and can return the liquefied gas 11 to the liquefied gas tank 10 .
  • the liquefied gas 11 is circulated from the payout line 20 through the minimum flow line 23 when the flow rate is required to maintain the delivery pump 12 . Thereby, the minimum flow rate of the delivery pump 12 can be ensured.
  • the liquefied gas 11 may be discharged to the downstream side of the discharge line 20, or the downstream side may be shut off.
  • a mini-flow valve 24 is preferably installed in the minimum flow line 23 as a valve for changing the flow rate of the minimum flow or opening and closing the flow.
  • the miniflow valve 24 may be a control valve that adjusts the flow rate based on the indication of a pressure indicator controller 25 installed in the dispensing line 20 .
  • two or more delivery pumps 12 may be installed for the same liquefied gas tank 10 .
  • the dispensing line 20 in the illustrated example has a branch line portion 21 connected to the discharge portion 12 a of the delivery pump 12 and a trunk line portion 22 joined from the branch line portion 21 . This allows the payout line 20 to be shared by two or more delivery pumps 12 .
  • the minimum flow line 23 is shared by two or more delivery pumps 12 as well as the payout line 20 .
  • the flow rate of the minimum flow line 23 can be maintained by adjusting the opening degree of the mini flow valve 24 of the combined minimum flow line 23 according to the pressure value measured by the pressure indicator controller 25 . This eliminates the need for flow meters and regulating valves in the minimum flow line 23 for each delivery pump 12 .
  • the degree of opening of the miniflow valve 24 may become too large.
  • the flow rate may be excessively adjusted at a constant set value.
  • the pump discharge pressure of the delivery pump 12 measured by the pressure indicator controller 25 is controlled to be constant, the pump discharge pressure depends on the liquid level of the liquefied gas 11 stored in the liquefied gas tank 10 and the pump It can fluctuate under the influence of suction pressure.
  • the control system 30 of the embodiment controls the minimum flow in consideration of fluctuations in the internal state of the liquefied gas tank 10 . Specifically, from the density and liquid level of the liquefied gas 11 stored in the liquefied gas tank 10 and the gas phase pressure above the liquid level 11b of the liquefied gas 11 in the liquefied gas tank 10, the liquid level of the liquefied gas 11 is Calculate the pump suction pressure of the delivery pump 12 under 11b.
  • the pump suction pressure can be obtained.
  • the gas phase pressure of the liquefied gas 11 can be measured using a pressure gauge 13 installed on the liquid surface 11b of the liquefied gas 11, for example.
  • the weight per unit area (bottom area) of the liquefied gas 11 may be obtained, for example, by multiplying the height difference from the liquid surface 11b to the suction part 12b by the density and gravitational acceleration of the liquefied gas 11.
  • the density distribution may be integrated in the integration interval along the vertical direction. A more accurate value is obtained by considering the density distribution of the liquefied gas 11 .
  • the density and liquid level of the liquefied gas 11 can be measured, for example, by a density meter 14 and a level meter 15 using a measurement unit 16 immersed under the liquid level 11b of the liquefied gas 11. .
  • a single instrument capable of measuring the density, temperature and level of the liquefied gas 11 may be used. If the density distribution of the liquefied gas 11 is not considered, a density meter (not shown) immersed under the liquid surface 11b of the liquefied gas 11 may be used. If a density meter is not available, a manually entered density value may be used.
  • the outputs of pressure gauge 13, density gauge 14 and level gauge 15 are sent to control system 30 via signal paths 31, 32 and 33, respectively.
  • the signal paths 31, 32, 33 may be wired such as cables or wireless such as radio waves.
  • the control system 30 may be configured by a distributed control system (DCS).
  • Control system 30 may include, for example, an electronic circuit having a program.
  • Control system 30 may have storage if desired.
  • a storage device can be realized by using, for example, a semiconductor memory, a magnetic hard disk, or the like.
  • Deploying the control system 30 in the liquefied gas receiving facility 100 facilitates automation of control and integration of information.
  • the control system 30 can control the minimum flow of the delivery pump 12 using the pump suction pressure of the delivery pump 12 and the pump performance curve of the delivery pump 12 .
  • the pump performance curve is a curve representing the relationship between the flow rate (FLOWRATE) of the delivery pump 12 and the head (HEAD), as shown in FIG. 3, for example.
  • the pump performance curve C When the pump performance curve C is represented on a graph, it generally becomes a downward sloping curve, as shown in the figure, where the higher the flow rate, the lower the head.
  • the pump performance curve C can generally be expressed as a monotonically decreasing function.
  • the pump performance curve C When the pump performance curve C is stored in the control system 30, it may be a computable function, or may be a data structure showing flow values and corresponding head values.
  • the minimum flow rate F 0 required to maintain the delivery pump 12 can be set in advance from the specifications of the delivery pump 12, operating conditions, and the like.
  • the flow rate F1 in the dispensing line 20 is preferably greater than or equal to the minimum flow rate F0 . Since the pump performance curve C monotonically decreases with respect to the flow rate, the head H0 corresponding to the minimum flow rate is preferably equal to or greater than the head H1 corresponding to the flow rate F1 described above. Thus, by utilizing the fact that the pump performance curve C represents the relationship between the flow rate and the head , the minimum flow can be better controlled.
  • the pump discharge pressure of the delivery pump 12 is obtained by adding the "pump suction pressure” to the “pressure converted to the head", and furthermore, the "pressure loss in the piping” from the delivery pump 12 to the payout line 20 and the “height difference” are converted. It can be obtained by subtracting the pressure As for the "pressure loss in the piping", it is preferable to consider the pressure loss in the piping from the suction portion 12b of the delivery pump 12 to the pressure indicator controller 25 of the delivery line 20. Moreover, it is preferable to consider the difference in height from the suction portion 12b of the delivery pump 12 to the pressure indicator controller 25 of the dispensing line 20 for the "pressure obtained by converting the difference in height".
  • control system 30 is able to estimate the pump discharge pressure at the minimum flow F 0 based on the head H 0 corresponding to the minimum flow F 0 required to maintain the delivery pump 12 in the pump performance curve C. . By comparing the estimated pump discharge pressure to the actual pump discharge pressure measured in the payout line 20, the minimum flow can be controlled.
  • control system 30 controls miniflow valve 24 to increase the flow in minimum flow line 23 . Thereby, it is possible to suppress the shortage of the minimum flow. Additionally, control system 30 may decrease the flow rate in minimum flow line 23 if the measured pump discharge pressure is lower than the estimated pump discharge pressure. This can prevent the minimum flow from becoming excessive.
  • the measured value of the pump discharge pressure in the dispensing line 20 can be measured using the pressure indicating controller 25. Control is facilitated by comparing the measured pump discharge pressure to the estimated pump discharge pressure to control the minimum flow.
  • the corresponding head H 0 was obtained from the known minimum flow rate F 0 , but it is also possible to estimate the flow rate from the known head, conversely.
  • the control system 30 can use the actual pump discharge pressure measured in the payout line 20 , the pump suction pressure, and the pump performance curve C to determine an estimated flow rate in the payout line 20 .
  • the "pump suction pressure” is subtracted from the pump discharge pressure of the delivery pump 12, and the "pressure loss in the piping” and the “pressure obtained by converting the height difference” from the delivery pump 12 to the dispensing line 20 are calculated.
  • the pressure obtained by converting the lift H1 described above can be obtained.
  • an estimated flow rate is obtained as the flow rate F1 corresponding to the head H1 described above.
  • control system 30 controls the miniflow valve 24 to increase the flow rate in the minimum flow line 23 . Thereby, it is possible to suppress the shortage of the minimum flow. Additionally, control system 30 may decrease the flow rate in minimum flow line 23 if estimated flow rate F1 is greater than minimum flow rate F0. This can prevent the minimum flow from becoming excessive. Controlling the minimum flow by comparing the minimum flow rate F 0 to the estimated flow rate F 1 facilitates control.
  • the control method using the pump performance curve C described above suppresses an excessive flow rate in the minimum flow line 23, it is preferably applied when there is a high possibility that the actual flow rate is equal to or higher than the minimum flow rate F0 .
  • the pump discharge pressure of the delivery pump 12 is measured using the control described above, and the pump delivery pressure at the minimum flow rate F0 is estimated. It is also possible to control the minimum flow by whether it is higher than the value.
  • the minimum flow line 23 is shared by two or more delivery pumps 12 as well as the payout line 20 . It is not limited. The control method described above can also be applied when the payout line 20 or the minimum flow line 23 is installed one-to-one for each delivery pump 12 .
  • the flow rate is small, so the liquefied gas 11 may be flowed through the minimum flow line 23 through the mini-flow valve 24 for a predetermined time after the start-up of the delivery pump 12. good.
  • the flow rate of the minimum flow line 23 may become excessive within a predetermined period of time, but since the period of time is limited, the amount that is wasted is relatively small.
  • control since only the time from activation is used as a control factor, control becomes easier.
  • the delivery pump 12 in operation when simultaneously operating two or more delivery pumps 12 installed in the same liquefied gas tank 10, the delivery pump 12 in operation may be considered.
  • the control system 30 confirms that no other delivery pumps 12 are operating in the same liquefied gas tank 10
  • the first delivery pump 12 A liquefied gas may be flowed through the minimum flow line 23 through the miniflow valve 24 at a predetermined time after startup.
  • the control system 30 can confirm the number and number of the delivery pumps 12 in operation based on the operating status of the delivery pumps 12 and the activation status of the motors and the like. This allows control system 30 to determine whether other delivery pumps 12 are operating.
  • a miniflow valve 24 installed in the minimum flow line 23 has a capacity coefficient.
  • the definition of capacity factor varies by vendor of the miniflow valve 24, but may be, for example, a Cv value or a Kv value.
  • the capacity coefficient is a constant indicating that there is a specific relationship between the flow rate Q, the specific gravity G of the fluid, and the differential pressure ⁇ P.
  • the control system 30 can calculate the flow rate at the miniflow valve 24 from the pressure value of the pressure indicating controller 25 and the capacity coefficient of the miniflow valve 24 . Thereby, the control system 30 can determine whether or not the minimum flow is maintained.
  • Control system 30 sends or receives signals directly or indirectly to pressure indicating controller 25 and miniflow valve 24 via signal paths 34,35.
  • the signal paths 34 and 35 may be wired such as cables or wireless such as radio waves.
  • control system 30 can control to increase the flow rate in the miniflow valve 24 when the calculated value of the flow rate in the miniflow valve 24 calculated using the capacity coefficient is insufficient to maintain the minimum flow. Thereby, the minimum flow can be maintained more reliably.
  • the control method of the embodiment basically uses the control method using the pump performance curve C described above. Immediately after starting the delivery pump 12, the above-described (1) control method using the pump performance curve C, (2) control method for ensuring a constant flow rate at a predetermined time immediately after starting, and (3) the miniflow valve 24 By using one or more of the control methods using the capacity coefficient of , it is possible to more reliably maintain the minimum flow.
  • the flow rate at the miniflow valve 24 is also the sum of the flow rates of the two or more delivery pumps 12. value. Therefore, in the control method using the capacity coefficient of the miniflow valve 24, when only one delivery pump 12 is in operation, the flow rate calculated using the capacity coefficient is the same as the flow rate by the delivery pump 12 in operation. can be regarded as When two or more delivery pumps 12 are in operation, the flow rate calculated using the capacity factor is the sum of the flow rates of the two or more delivery pumps 12 . Therefore, the control system 30 may calculate the flow rate per pump according to the number of the pumps 12 in operation and use it for control.
  • the miniflow valve 24 is automatically closed.
  • Control method when additionally starting the delivery pump When starting one of the two or more delivery pumps 12 provided in the same liquefied gas tank 10, the control system 30 confirms that the delivery pump 12 different from the delivery pump 12 to be additionally started is being operated. When it does, a different control than the initial delivery pump 12 activation may be used.
  • the control system calculates the total flow rate downstream of the payout line 20, and determines whether or not this total value is sufficient to maintain the minimum flow of the newly started delivery pump 12 and the delivery pump 12 in operation. It is preferable to determine whether
  • FIG. 1 downstream of the payout line 20, a payout pipe 41 for supplying the gas in a state of being vaporized by the vaporizer 45 from the liquefied gas 11 to the gas supply unit 46, and a payout pipe 41 for supplying the liquefied gas 11 for the cold insulation circulation 54
  • a pipe 51 is shown downstream of the payout line 20
  • FIG. 2 also shows a payout pipe 61 for supplying the liquefied gas 11 for domestic ship shipment 64 and a payout pipe 71 for supplying the liquefied gas 11 for lorry shipment 74 .
  • a secondary pump 42 may be provided in the delivery pipe 41 when the pressure of the delivery pump 12 serving as the primary pump is insufficient to transfer the liquefied gas 11 .
  • the gas supply unit 46 supplies LNG to power plants, city gas production plants, and the like.
  • Flowmeters 43, 52, 62, 72 and valves 44, 53, 63, 73 are installed in the respective payout pipes 41, 51, 61, 71. These flow meters 43 , 52 , 62 , 72 are transmitted to control system 30 via signal path 36 .
  • the signal path 36 may be wired such as a cable or wireless such as radio waves.
  • the supply destinations of the delivery pipes 41, 51, 61, and 71 shown in FIGS. 1 and 2 are schematic examples, and the number, combination, and the like can be changed as appropriate. It can also be applied to supply destinations other than those exemplified, such as railway transportation.
  • the control system 30 will continue to operate the miniflow valve 24 even if the miniflow valve 24 remains closed. , it can be determined that there is no problem with additional start-up. Further, according to the control method immediately after starting the delivery pump 12 described above, the liquefied gas 11 may be controlled to flow through the minimum flow line 23 through the mini flow valve 24 at a predetermined time after the additional start of the delivery pump 12. .
  • the flow rate of the delivery pump 12 in operation is equal to the minimum flow of the delivery pump 12 in operation.
  • the liquefied gas receiving facility and control method of the present invention are not particularly limited, but can be used for LNG receiving bases, LPG receiving bases, storage facilities, and the like.
  • Pressure indicator controller 30 ... Control system, 31 32, 33, 34, 35, 36... signal path, 41, 51, 61, 71... discharge pipe, 42... secondary pump, 43, 52, 62, 72... flow meter, 44, 53, 63, 73... valve, 45...Vaporizer, 46...Gas supply unit, 54...Refrigerant circulation, 64...Domestic ship shipment, 74...Lorry shipment, 100...Liquefied gas receiving facility.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Selon la présente invention, une installation de réception de gaz liquéfié comprend un réservoir de gaz liquéfié qui stocke un gaz liquéfié, une conduite de retrait qui retire le gaz liquéfié à l'état liquide du réservoir de gaz liquéfié, une pompe de distribution qui fournit le gaz liquéfié du réservoir de gaz liquéfié à la conduite de retrait, et une conduite d'écoulement minimal qui se ramifie à partir de la conduite de retrait et qui est capable de renvoyer le gaz liquéfié au réservoir de gaz liquéfié, une pression d'aspiration de pompe de la pompe de refoulement au-dessous du niveau de liquide du gaz liquéfié étant calculée à partir de la densité et du niveau de liquide du gaz liquéfié stocké dans le réservoir de gaz liquéfié, et une pression de phase gazeuse au-dessus du niveau de liquide du gaz liquéfié dans le réservoir de gaz liquéfié ; et un écoulement minimal de la pompe de refoulement est commandé à l'aide de la pression d'aspiration de pompe, et d'une courbe de performance de pompe de la pompe de refoulement.
PCT/JP2021/043817 2021-11-30 2021-11-30 Installation de réception de gaz liquéfié et son procédé de commande WO2023100231A1 (fr)

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PCT/JP2021/043817 WO2023100231A1 (fr) 2021-11-30 2021-11-30 Installation de réception de gaz liquéfié et son procédé de commande
JP2022544270A JP7155460B1 (ja) 2021-11-30 2021-11-30 液化ガス受入設備およびその制御方法

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JP2005308149A (ja) * 2004-04-23 2005-11-04 Iwatani Internatl Corp 需要機器連動式低温液化ガス供給装置
JP2007175594A (ja) * 2005-12-27 2007-07-12 Ishikawajima Plant Construction Co Ltd 大気放出ガスの回収と臭気成分の除去設備

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JP2005308149A (ja) * 2004-04-23 2005-11-04 Iwatani Internatl Corp 需要機器連動式低温液化ガス供給装置
JP2007175594A (ja) * 2005-12-27 2007-07-12 Ishikawajima Plant Construction Co Ltd 大気放出ガスの回収と臭気成分の除去設備

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